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CN102136736B - Method and device for inhibiting and eliminating leakage current of photovoltaic grid connection system without transformer - Google Patents

Method and device for inhibiting and eliminating leakage current of photovoltaic grid connection system without transformer Download PDF

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CN102136736B
CN102136736B CN2011100441890A CN201110044189A CN102136736B CN 102136736 B CN102136736 B CN 102136736B CN 2011100441890 A CN2011100441890 A CN 2011100441890A CN 201110044189 A CN201110044189 A CN 201110044189A CN 102136736 B CN102136736 B CN 102136736B
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leakage current
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孙耀杰
林燕丹
苏晓萌
童立青
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Fudan University
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Abstract

本发明涉及一种抑制和消除无变压器并网光伏系统漏电流的方法和装置。由漏电流检测器，中央控制器和波形发生器组成。中央控制器内设有波形分析电路、指令电流运算电路和电流跟踪控制电路，波形发生器内设有驱动电路和功率模块；漏电流检测器设置于逆变器的直流侧并与中央控制器相连接；中央控制器用于分析处理漏电流波形并产生补偿电流控制信号，波形发生器设置于光伏阵列并与中央控制器的电流跟踪控制电路输出端相连接，用于按照中央控制器的指令产生相应的补偿电流注入光伏系统。本发明通过检测漏电流波形，分析处理并产生一个与漏电流大小相等、相位相反的补偿电流。该补偿电流被注入电路后与漏电流叠加相消，达到抑制和消除漏电流的目的，具有实时监测、跟踪，动态补偿，功耗较小，受环境影响较小等特点，能有效地抑制和消除漏电流，具有巨大的应用前景和经济效应。

Figure 201110044189

The invention relates to a method and device for suppressing and eliminating the leakage current of a grid-connected photovoltaic system without a transformer. It consists of leakage current detector, central controller and waveform generator. The central controller is equipped with a waveform analysis circuit, command current calculation circuit and current tracking control circuit, and the waveform generator is equipped with a drive circuit and a power module; the leakage current detector is installed on the DC side of the inverter and connected to the central controller. Connection; the central controller is used to analyze and process the leakage current waveform and generate the compensation current control signal. The compensation current is injected into the photovoltaic system. The invention detects the leakage current waveform, analyzes and processes it, and generates a compensation current which is equal in magnitude to the leakage current and opposite in phase. After the compensation current is injected into the circuit, it superimposes and cancels the leakage current to achieve the purpose of suppressing and eliminating the leakage current. It has the characteristics of real-time monitoring, tracking, dynamic compensation, low power consumption, and less affected by the environment. It can effectively suppress and eliminate the leakage current. Eliminating the leakage current has great application prospects and economic effects.

Figure 201110044189

Description

一种抑制和消除无变压器光伏并网系统漏电流的方法和装置A method and device for suppressing and eliminating leakage current of transformerless photovoltaic grid-connected system

技术领域 technical field

本发明属于光伏并网系统逆变技术领域，具体涉及一种抑制和消除无变压器光伏并网系统漏电流的方法和装置。 The invention belongs to the technical field of photovoltaic grid-connected system inverters, and in particular relates to a method and device for suppressing and eliminating the leakage current of a transformerless photovoltaic grid-connected system.

背景技术 Background technique

近年来人们对能源的需求越来越大，对节能的要求也越来越高。太阳能作为一种清洁的可再生能源有着广阔的应用前景，并网式光伏系统将会成为一种趋势。过去光伏系统的成本主要取决于太阳能电池芯片的价格，而随着芯片生产能力的提高和价格的下降，逆变器越来越成为制约光伏系统成本的因素。 In recent years, people's demand for energy is increasing, and the requirements for energy saving are also getting higher and higher. As a clean and renewable energy source, solar energy has broad application prospects, and grid-connected photovoltaic systems will become a trend. In the past, the cost of photovoltaic systems mainly depended on the price of solar cell chips, but with the improvement of chip production capacity and the decline of prices, inverters have increasingly become a factor restricting the cost of photovoltaic systems.

为了确保人身安全和避免漏电流，光伏并网系统的常采用带工频或高频变压器的隔离性逆变器。但工频变压器体积大、笨重且价格昂贵；高频变压器将使控制复杂化且降低了系统的效率。无变压器拓扑结构的逆变器能够很好的克服上述有变压器系统的不足，提高系统效率，降低成本，体积和重量利于小型化。 In order to ensure personal safety and avoid leakage current, photovoltaic grid-connected systems often use isolated inverters with power frequency or high frequency transformers. But the power frequency transformer is bulky, heavy and expensive; the high frequency transformer will complicate the control and reduce the efficiency of the system. The inverter with transformerless topology can well overcome the shortcomings of the above-mentioned transformer system, improve system efficiency, reduce cost, and facilitate miniaturization in volume and weight.

然而在无变压器的光伏并网系统中，交流电网和直流的光伏阵列之间存在直接的电气接触，，由于光伏阵列和地之间不可避免地存在寄生电容，为漏电流提供了通道，寄生电容上变化的电压将激励相应的漏电流，引起EMI等问题并造成安全隐患和保护设备的误动作等。 However, in a photovoltaic grid-connected system without a transformer, there is direct electrical contact between the AC grid and the DC photovoltaic array. Due to the inevitable parasitic capacitance between the photovoltaic array and the ground, it provides a channel for the leakage current. The parasitic capacitance The changing voltage will stimulate the corresponding leakage current, causing problems such as EMI and causing safety hazards and malfunctions of protection equipment.

由于漏电流的频率和大小根据控制方式、器件特性、天气条件和其它环境因素等不同而有很大的变化，传统的滤波技术如LC滤波器、H5电路或H6电路改进方法均在抑制动态漏电流方面均有一定的局限性。 Since the frequency and size of the leakage current vary greatly depending on the control method, device characteristics, weather conditions and other environmental factors, traditional filtering techniques such as LC filters, H5 circuit or H6 circuit improvement methods are all effective in suppressing dynamic leakage. There are certain limitations in terms of current flow.

本发明提出的一种基于有源滤波思想的抑制无变压器光伏并网漏电流的方法和装置，具有实时监测、跟踪和动态补偿的特点，能有效地抑制和消除漏电流。 A method and device for suppressing the leakage current of transformerless photovoltaic grid-connected based on the idea of active filtering proposed by the present invention has the characteristics of real-time monitoring, tracking and dynamic compensation, and can effectively suppress and eliminate the leakage current.

发明内容 Contents of the invention

本发明的目的是提供一种能够抑制和消除无变压器光伏并网系统漏电流的方法和装置。能够对不同频率、不同大小的漏电流进行抑制和消除，工作范围广，受环境因素影响较小，适用于无变压器光伏并网系统。 The purpose of the present invention is to provide a method and device capable of suppressing and eliminating the leakage current of a transformerless photovoltaic grid-connected system. It can suppress and eliminate leakage currents of different frequencies and sizes. It has a wide working range and is less affected by environmental factors. It is suitable for transformerless photovoltaic grid-connected systems.

本发明提出的抑制和消除漏电流的方法基于有源滤波和无功补偿的原理，通过检测漏电流波形，分析处理并产生一个与漏电流大小相等、相位相反的补偿电流。该补偿电流被注入电路后与漏电流叠加相消，达到抑制和消除漏电流的目的。 The method for suppressing and eliminating the leakage current proposed by the present invention is based on the principle of active filtering and reactive power compensation, through detecting the leakage current waveform, analyzing and processing and generating a compensation current equal in magnitude and opposite in phase to the leakage current. After the compensation current is injected into the circuit, it is superimposed and eliminated with the leakage current, so as to achieve the purpose of suppressing and eliminating the leakage current.

本发明提出的抑制和消除无变压器光伏并网系统漏电流的方法，具体步骤如下： The method for suppressing and eliminating the leakage current of the transformerless photovoltaic grid-connected system proposed by the present invention, the specific steps are as follows:

流入逆变器直流侧的电流                                                

Figure 638088DEST_PATH_IMAGE001
包括两部分，分别是光伏阵列输出的光电流
Figure 617546DEST_PATH_IMAGE002
和无变压器光伏并网系统的漏电流
Figure 521917DEST_PATH_IMAGE003
。经过漏电流检测器1和波形分析电路4，漏电流的幅值和相位信息被提取。指令电流运算电路5根据漏电流的波形信息计算并发出指令
Figure 918449DEST_PATH_IMAGE004
，指令
Figure 803228DEST_PATH_IMAGE004
的要求是补偿电流的大小与漏电流相同且相位与之相反。电流跟踪控制电路6根据指令信号
Figure 194895DEST_PATH_IMAGE004
和实际的补偿电流
Figure 512570DEST_PATH_IMAGE005
之间的关系，得出控制波形发生器中功率模块各个器件通断的信号，控制的结果应保证补偿电流
Figure 243766DEST_PATH_IMAGE005
跟踪其指令电流
Figure 361763DEST_PATH_IMAGE004
的变化，并且要求具有较好的实时性。波形发生器根据指令信号
Figure 178409DEST_PATH_IMAGE004
产生补偿电流
Figure 40055DEST_PATH_IMAGE005
并注入系统，使得系统的直流侧电流
Figure 688074DEST_PATH_IMAGE006
中只含光电流
Figure 180235DEST_PATH_IMAGE002
而不含漏电流
Figure 546495DEST_PATH_IMAGE003
。 The current flowing into the DC side of the inverter
Figure 638088DEST_PATH_IMAGE001
It consists of two parts, which are the photocurrent output by the photovoltaic array
Figure 617546DEST_PATH_IMAGE002
and leakage current of transformerless photovoltaic grid-connected system
Figure 521917DEST_PATH_IMAGE003
. After the leakage current detector 1 and the waveform analysis circuit 4, the leakage current The magnitude and phase information is extracted. The command current operation circuit 5 calculates and issues commands according to the waveform information of the leakage current
Figure 918449DEST_PATH_IMAGE004
,instruction
Figure 803228DEST_PATH_IMAGE004
The requirement is that the magnitude of the compensation current is the same as that of the leakage current and the phase is opposite to it. The current tracking control circuit 6 according to the instruction signal
Figure 194895DEST_PATH_IMAGE004
and the actual compensation current
Figure 512570DEST_PATH_IMAGE005
The relationship between them can be obtained to control the on-off signal of each device in the power module in the waveform generator. The control result should ensure that the compensation current
Figure 243766DEST_PATH_IMAGE005
track its command current
Figure 361763DEST_PATH_IMAGE004
changes, and requires better real-time performance. The waveform generator according to the command signal
Figure 178409DEST_PATH_IMAGE004
generate compensation current
Figure 40055DEST_PATH_IMAGE005
and injected into the system so that the DC side current of the system
Figure 688074DEST_PATH_IMAGE006
photocurrent
Figure 180235DEST_PATH_IMAGE002
without leakage current
Figure 546495DEST_PATH_IMAGE003
.

由于寄生电容通交流隔直流的特性，直流成分

Figure 883935DEST_PATH_IMAGE002
不会流经寄生电容，从而达到抑制和消除漏电流的目的。上述原理用公式表示即为： Due to the characteristics of the parasitic capacitance communicating AC and blocking DC, the DC component
Figure 883935DEST_PATH_IMAGE002
It will not flow through the parasitic capacitance, so as to achieve the purpose of suppressing and eliminating the leakage current. The above principle is expressed by the formula:

Figure 652040DEST_PATH_IMAGE007
Figure 652040DEST_PATH_IMAGE007

本发明提出的抑制和消除无变压器光伏并网系统漏电流的装置，由漏电流检测器1、中央控制器2、波形发生器3组成，其中：中央控制器2内设有波形分析电路4、指令电流运算电路5和电流跟踪控制电路6，波形分析电路4的输出端连接指令电路运算电路5，指令电路运算电路5的输出端连接电路跟踪控制电路6，波形发生器3内设有驱动电路7和功率模块8，驱动电路7的输出端连接功率模块8；漏电流检测器1设置于逆变器的直流侧并与中央控制器2的波形分析电路4的输入端相连接，用于检测和采样系统的漏电流，并将采样的漏电流信息输入中央控制器2；中央控制器2用于分析处理漏电流波形并产生补偿电流控制信号，波形发生器3设置于光伏阵列的输出端并与中央控制器的电流跟踪控制电路6输出端相连接，用于按照中央控制器的指令产生相应的补偿电流注入光伏系统。 The device for suppressing and eliminating the leakage current of the transformerless photovoltaic grid-connected system proposed by the present invention is composed of a leakage current detector 1, a central controller 2, and a waveform generator 3, wherein: the central controller 2 is provided with a waveform analysis circuit 4, Instruction current operation circuit 5 and current tracking control circuit 6, the output end of waveform analysis circuit 4 is connected to instruction circuit operation circuit 5, the output end of instruction circuit operation circuit 5 is connected to circuit tracking control circuit 6, and the waveform generator 3 is provided with a driving circuit 7 and a power module 8, the output end of the driving circuit 7 is connected to the power module 8; the leakage current detector 1 is arranged on the DC side of the inverter and is connected to the input end of the waveform analysis circuit 4 of the central controller 2 for detecting and the leakage current of the sampling system, and input the sampled leakage current information into the central controller 2; the central controller 2 is used to analyze and process the leakage current waveform and generate a compensation current control signal, and the waveform generator 3 is arranged at the output end of the photovoltaic array and It is connected with the output terminal of the current tracking control circuit 6 of the central controller, and is used to generate corresponding compensation current to inject into the photovoltaic system according to the instructions of the central controller.

本发明中，所述漏电流检测器1可以由电阻、变压器或电流传感器等器件及其相应辅助电路组成。 In the present invention, the leakage current detector 1 may be composed of devices such as resistors, transformers or current sensors and their corresponding auxiliary circuits.

本发明中，所述波形发生器3的功率模块8可采用IGBT或MOSFET等半导体器件组成各种拓扑结构，可采取但不限于PWM技术生成相应波形。 In the present invention, the power module 8 of the waveform generator 3 can use semiconductor devices such as IGBT or MOSFET to form various topological structures, and can use but not limited to PWM technology to generate corresponding waveforms.

本发明中，中央控制器2由波形分析电路、指令电流运算电路、电流跟踪控制电路组成。波形分析电路用于分析处理上述1）中漏电流检测器采样的漏电流信息；指令电流运算电路用于根据波形分析电路的结果和补偿目的计算所需的补偿电流；电流跟踪控制电路用于根据实际的补偿电流和指令电流运算电路要求的指令补偿电流之间的相互关系，控制波形发生器功率模块中各元件的通断。 In the present invention, the central controller 2 is composed of a waveform analysis circuit, a command current calculation circuit, and a current tracking control circuit. The waveform analysis circuit is used to analyze and process the leakage current information sampled by the leakage current detector in the above 1); the command current operation circuit is used to calculate the required compensation current according to the result of the waveform analysis circuit and the purpose of compensation; the current tracking control circuit is used to The relationship between the actual compensation current and the command compensation current required by the command current operation circuit controls the on-off of each component in the power module of the waveform generator.

本发明基于有源滤波的抑制和消除无变压器光伏并网系统漏电流的方法和装置，具有以下明显优点： The method and device for suppressing and eliminating the leakage current of a transformerless photovoltaic grid-connected system based on active filtering of the present invention have the following obvious advantages:

1）实现了动态补偿，可对频率和大小都变化的漏电流进行补偿，抑制和消除漏电流的效果较好。 1) Dynamic compensation is realized, which can compensate the leakage current whose frequency and size change, and the effect of suppressing and eliminating the leakage current is better.

2） 对漏电流的变化响应极快，补偿范围广，抑制和消除效果不易受环境因素影响，具有较好的通用性。 2) The response to the change of leakage current is extremely fast, the compensation range is wide, the suppression and elimination effect is not easily affected by environmental factors, and it has good versatility.

3） 受系统阻抗影响不大，不容易与系统发生谐振。 3) It is not greatly affected by the impedance of the system, and it is not easy to resonate with the system.

4）  不需要大容量的储能元件，装置本身消耗功率较小，具有较好的经济效应。 4) There is no need for large-capacity energy storage components, and the device itself consumes less power, which has better economic effects.

5）  光伏系统自身的电流大小对抑制和消除漏电流装置影响不大，一般不会发生该装置过载的情况。 5) The current level of the photovoltaic system itself has little effect on the suppression and elimination of leakage current devices, and generally the device will not be overloaded.

附图说明 Description of drawings

    图1是本发明的系统结构框图。 Fig. 1 is a system structure block diagram of the present invention.

    图2是本发明的中央控制器的电路结构框图。 Fig. 2 is a block diagram of the circuit structure of the central controller of the present invention.

    图3是本发明的波形发生器的电路结构框图。 Figure 3 is a block diagram of the circuit structure of the waveform generator of the present invention.

    图4是本发明的电路结构及原理图。 Figure 4 is a circuit structure and schematic diagram of the present invention.

图中标号：1为漏电流检测器，2为中央控制器，3为波形发生器，4为波形分析电流，5为指令电流运算电路，6为电流跟踪控制电路，7为驱动电路，8为功率模块。 Numbers in the figure: 1 is the leakage current detector, 2 is the central controller, 3 is the waveform generator, 4 is the waveform analysis current, 5 is the instruction current calculation circuit, 6 is the current tracking control circuit, 7 is the driving circuit, 8 is the power module.

具体实施方式 Detailed ways

以下结合附图详细描述本发明的原理方法和装置的工作过程。 The working process of the principles, methods and devices of the present invention will be described in detail below in conjunction with the accompanying drawings.

参见图1~图4，流入逆变器直流侧的电流

Figure 117699DEST_PATH_IMAGE001
包括两部分，分别是光伏阵列输出的光电流
Figure 908938DEST_PATH_IMAGE002
和无变压器光伏并网系统的漏电流
Figure 112386DEST_PATH_IMAGE003
。经过漏电流检测器1和波形分析电路4，漏电流
Figure 734997DEST_PATH_IMAGE003
的幅值和相位信息被提取。指令电流运算电路5根据漏电流的波形信息计算并发出指令
Figure 631278DEST_PATH_IMAGE004
，指令
Figure 706550DEST_PATH_IMAGE004
的要求是补偿电流的大小与漏电流相同且相位与之相反。电流跟踪控制电路6根据指令信号
Figure 651372DEST_PATH_IMAGE004
和实际的补偿电流
Figure 128490DEST_PATH_IMAGE005
之间的关系，得出控制波形发生器中功率模块各个器件通断的信号，控制的结果应保证补偿电流
Figure 195672DEST_PATH_IMAGE005
跟踪其指令电流
Figure 695924DEST_PATH_IMAGE004
的变化，并且要求具有较好的实时性。波形发生器根据指令信号
Figure 258753DEST_PATH_IMAGE004
产生补偿电流并注入系统，使得系统的直流侧电流
Figure 31722DEST_PATH_IMAGE006
中只含光电流
Figure 81587DEST_PATH_IMAGE002
而不含漏电流
Figure 368212DEST_PATH_IMAGE003
。 Refer to Figure 1~Figure 4, the current flowing into the DC side of the inverter
Figure 117699DEST_PATH_IMAGE001
It consists of two parts, which are the photocurrent output by the photovoltaic array
Figure 908938DEST_PATH_IMAGE002
and leakage current of transformerless photovoltaic grid-connected system
Figure 112386DEST_PATH_IMAGE003
. After the leakage current detector 1 and the waveform analysis circuit 4, the leakage current
Figure 734997DEST_PATH_IMAGE003
The magnitude and phase information is extracted. The command current operation circuit 5 calculates and issues commands according to the waveform information of the leakage current
Figure 631278DEST_PATH_IMAGE004
,instruction
Figure 706550DEST_PATH_IMAGE004
The requirement is that the magnitude of the compensation current is the same as that of the leakage current and the phase is opposite to it. The current tracking control circuit 6 according to the command signal
Figure 651372DEST_PATH_IMAGE004
and the actual compensation current
Figure 128490DEST_PATH_IMAGE005
The relationship between them can be obtained to control the on-off signal of each device in the power module in the waveform generator. The control result should ensure that the compensation current
Figure 195672DEST_PATH_IMAGE005
track its command current
Figure 695924DEST_PATH_IMAGE004
changes, and requires better real-time performance. The waveform generator according to the instruction signal
Figure 258753DEST_PATH_IMAGE004
generate compensation current and injected into the system so that the DC side current of the system
Figure 31722DEST_PATH_IMAGE006
photocurrent
Figure 81587DEST_PATH_IMAGE002
without leakage current
Figure 368212DEST_PATH_IMAGE003
.

由于寄生电容通交流隔直流的特性，直流成分不会流经寄生电容，从而达到抑制和消除漏电流的目的。上述原理用公式表示即为： Due to the characteristics of the parasitic capacitance communicating AC and blocking DC, the DC component It will not flow through the parasitic capacitance, so as to achieve the purpose of suppressing and eliminating the leakage current. The above principle is expressed by the formula:

Figure 963327DEST_PATH_IMAGE007
Figure 963327DEST_PATH_IMAGE007

本发明具体构成如下： Concrete constitution of the present invention is as follows:

(1)一个漏电流检测器1，设置于逆变器的直流侧并与中央控制器2相连接，用于检测和采样系统的漏电流，并将采样的漏电流信息输入中央控制器2。 (1) A leakage current detector 1 is installed on the DC side of the inverter and connected to the central controller 2 for detecting and sampling the leakage current of the system, and inputting the sampled leakage current information into the central controller 2 .

(2)一个中央控制器2，分别与所述漏电流检测器1和波形发生器3相连接，用于分析处理漏电流波形并产生补偿电流控制信号。 (2) A central controller 2, which is respectively connected with the leakage current detector 1 and the waveform generator 3, is used for analyzing and processing the leakage current waveform and generating a compensation current control signal.

(3)一个波形发生器3，设置于光伏阵列的输出端并与中央控制器2相连接，用于按照中央控制器2的指令产生相应的补偿电流注入光伏系统。 (3) A waveform generator 3 is arranged at the output end of the photovoltaic array and connected with the central controller 2, and is used to generate corresponding compensation current to inject into the photovoltaic system according to the instructions of the central controller 2.

其中漏电流检测器1可以由电阻、变压器、电流传感器等器件及其相应辅助电路组成。波形发生器3由功率模块8和相应的驱动电路7组成，功率模块8可采用IGBT，MOSFET等半导体器件组成各种拓扑结构，可采取但不限于PWM技术生成相应波形。 The leakage current detector 1 may be composed of resistors, transformers, current sensors and other devices and their corresponding auxiliary circuits. The waveform generator 3 is composed of a power module 8 and a corresponding drive circuit 7. The power module 8 can use IGBT, MOSFET and other semiconductor devices to form various topological structures, and can adopt but not limited to PWM technology to generate corresponding waveforms.

中央控制器2由波形分析电路4、指令电流运算电路5、电流跟踪控制电路6组成。波形分析电路4用于分析处理上述(1）中漏电流检测器1采样的漏电流信息；指令电流运算电路5用于根据波形分析电路的结果和补偿目的计算所需的补偿电流；电流跟踪控制电路6用于根据实际的补偿电流和指令电流运算电路要求的指令补偿电流之间的相互关系，控制波形发生器功率模块8中各元件的通断。 The central controller 2 is composed of a waveform analysis circuit 4 , an instruction current calculation circuit 5 , and a current tracking control circuit 6 . The waveform analysis circuit 4 is used to analyze and process the leakage current information sampled by the leakage current detector 1 in the above (1); the instruction current operation circuit 5 is used to calculate the required compensation current according to the result of the waveform analysis circuit and the purpose of compensation; current tracking control The circuit 6 is used to control the on-off of each element in the waveform generator power module 8 according to the relationship between the actual compensation current and the command compensation current required by the command current operation circuit.

Claims (4)

1.一种抑制和消除无变压器光伏并网系统漏电流的方法，其特征在于具体步骤如下： 1. A method for suppressing and eliminating the leakage current of a transformerless photovoltaic grid-connected system, characterized in that the specific steps are as follows: 流入逆变器直流侧的电流                                                
Figure 65327DEST_PATH_IMAGE001
包括两部分，分别是光伏阵列输出的光电流
Figure 740021DEST_PATH_IMAGE002
和无变压器光伏并网系统的漏电流
Figure 699625DEST_PATH_IMAGE003
；经过漏电流检测器(1)和波形分析电路(4)，漏电流
Figure 67152DEST_PATH_IMAGE003
的幅值和相位信息被提取；指令电流运算电路(5)根据漏电流的波形信息计算并发出指令
Figure 184144DEST_PATH_IMAGE004
，指令
Figure 895486DEST_PATH_IMAGE004
的要求是补偿电流的大小与漏电流相同且相位与之相反；电流跟踪控制电路(6)根据指令
Figure 476640DEST_PATH_IMAGE004
和实际的补偿电流之间的关系，得出控制波形发生器中功率模块各个器件通断的信号，控制的结果应保证补偿电流
Figure 416094DEST_PATH_IMAGE005
跟踪其指令
Figure 931127DEST_PATH_IMAGE004
的变化，并且要求具有较好的实时性；波形发生器根据指令
Figure 304470DEST_PATH_IMAGE004
产生补偿电流
Figure 13801DEST_PATH_IMAGE005
并注入系统，使得系统的直流侧电流
Figure 338340DEST_PATH_IMAGE006
中只含光电流而不含漏电流
Figure 511013DEST_PATH_IMAGE003
； The current flowing into the DC side of the inverter
Figure 65327DEST_PATH_IMAGE001
It consists of two parts, which are the photocurrent output by the photovoltaic array
Figure 740021DEST_PATH_IMAGE002
and leakage current of transformerless photovoltaic grid-connected system
Figure 699625DEST_PATH_IMAGE003
; Through the leakage current detector (1) and the waveform analysis circuit (4), the leakage current
Figure 67152DEST_PATH_IMAGE003
The amplitude and phase information of the leakage current are extracted; the instruction current operation circuit (5) calculates and issues instructions according to the waveform information of the leakage current
Figure 184144DEST_PATH_IMAGE004
,instruction
Figure 895486DEST_PATH_IMAGE004
The requirement is that the magnitude of the compensation current is the same as the leakage current and the phase is opposite to it; the current tracking control circuit (6) according to the instruction
Figure 476640DEST_PATH_IMAGE004
and the actual compensation current The relationship between them can be obtained to control the on-off signal of each device in the power module in the waveform generator. The control result should ensure that the compensation current
Figure 416094DEST_PATH_IMAGE005
track its instructions
Figure 931127DEST_PATH_IMAGE004
changes, and requires better real-time performance; the waveform generator according to the instruction
Figure 304470DEST_PATH_IMAGE004
generate compensation current
Figure 13801DEST_PATH_IMAGE005
and injected into the system so that the DC side current of the system
Figure 338340DEST_PATH_IMAGE006
photocurrent without leakage current
Figure 511013DEST_PATH_IMAGE003
; 由于寄生电容通交流隔直流的特性，直流成分
Figure 391244DEST_PATH_IMAGE002
不会流经寄生电容，从而达到抑制和消除漏电流的目的；其公式表示即为： Due to the characteristics of the parasitic capacitance communicating AC and blocking DC, the DC component
Figure 391244DEST_PATH_IMAGE002
It will not flow through the parasitic capacitance, so as to achieve the purpose of suppressing and eliminating the leakage current; its formula is expressed as:
Figure 203080DEST_PATH_IMAGE007
。
Figure 203080DEST_PATH_IMAGE007
. 2.一种使用如权利要求1所述抑制和消除无变压器光伏并网系统漏电流的方法的装置，其特征在于由漏电流检测器(1)、中央控制器(2)、波形发生器(3)组成，其中：中央控制器(2)内设有波形分析电路(4)、指令电流运算电路(5)和电流跟踪控制电路(6)，波形分析电路(4)的输出端连接指令电流运算电路(5)，指令电流运算电路(5)的输出端连接电流跟踪控制电路(6)，波形发生器(3)内设有驱动电路(7)和功率模块(8)，驱动电路(7)的输出端连接功率模块(8)；漏电流检测器(1)设置于逆变器的直流侧并与中央控制器(2)的波形分析电路(4)的输入端相连接，用于检测和采样系统的漏电流，并将采样的漏电流信息输入中央控制器(2)；中央控制器(2)用于分析处理漏电流波形并产生补偿电流控制信号，波形发生器(3)设置于光伏阵列的输出端并与中央控制器的电流跟踪控制电路(6)输出端相连接，用于按照中央控制器的指令产生相应的补偿电流注入光伏系统。 2. A device that uses the method for suppressing and eliminating transformerless photovoltaic grid-connected system leakage current as claimed in claim 1, is characterized in that by leakage current detector (1), central controller (2), waveform generator ( 3) composition, wherein: the central controller (2) is equipped with a waveform analysis circuit (4), a command current calculation circuit (5) and a current tracking control circuit (6), and the output terminal of the waveform analysis circuit (4) is connected to the command current The operation circuit (5), the output terminal of the command current operation circuit (5) is connected to the current tracking control circuit (6), the waveform generator (3) is provided with a drive circuit (7) and a power module (8), and the drive circuit (7) ) is connected to the power module (8); the leakage current detector (1) is arranged on the DC side of the inverter and is connected to the input end of the waveform analysis circuit (4) of the central controller (2) for detecting and the leakage current of the sampling system, and input the sampled leakage current information into the central controller (2); the central controller (2) is used to analyze and process the leakage current waveform and generate a compensation current control signal, and the waveform generator (3) is set at The output end of the photovoltaic array is connected with the output end of the current tracking control circuit (6) of the central controller, and is used to generate corresponding compensation current to inject into the photovoltaic system according to the instruction of the central controller. 3.根据权利要求2所述的抑制和消除无变压器光伏并网系统漏电流的装置，其特征在于所述漏电流检测器(1)由电阻、变压器或电流传感器及其相应辅助电路组成。 3. The device for suppressing and eliminating the leakage current of the transformerless photovoltaic grid-connected system according to claim 2, characterized in that the leakage current detector (1) is composed of a resistor, a transformer or a current sensor and its corresponding auxiliary circuit. 4.根据权利要求2所述的抑制和消除无变压器光伏并网系统漏电流的装置，其特征在于所述波形发生器(3)的功率模块(8)采用IGBT或MOSFET半导体器件组成各种拓扑结构，不限于PWM技术生成相应波形。 4. The device for suppressing and eliminating the leakage current of transformerless photovoltaic grid-connected system according to claim 2, characterized in that the power module (8) of the waveform generator (3) adopts IGBT or MOSFET semiconductor devices to form various topologies structure, not limited to PWM technology to generate corresponding waveforms.
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