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WO2015070493A1 - Procédé de commande de commutation d'îlot pour convertisseur modulaire à multiples niveaux - Google Patents

Procédé de commande de commutation d'îlot pour convertisseur modulaire à multiples niveaux Download PDF

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Publication number
WO2015070493A1
WO2015070493A1 PCT/CN2013/088469 CN2013088469W WO2015070493A1 WO 2015070493 A1 WO2015070493 A1 WO 2015070493A1 CN 2013088469 W CN2013088469 W CN 2013088469W WO 2015070493 A1 WO2015070493 A1 WO 2015070493A1
Authority
WO
WIPO (PCT)
Prior art keywords
grid
voltage
loop
switching
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/088469
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English (en)
Chinese (zh)
Inventor
吴金龙
姚为正
张建
杨美娟
韩坤
左广杰
刘普
梁燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XJ Electric Co Ltd
Original Assignee
XJ Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XJ Electric Co Ltd filed Critical XJ Electric Co Ltd
Publication of WO2015070493A1 publication Critical patent/WO2015070493A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Definitions

  • the present invention relates to a modular multilevel converter island switching control method. Background technique
  • the flexible DC transmission technology uses fully-controlled power electronic devices and modular structures to improve DC voltage level and system capacity, and to expand control flexibility.
  • an object of the present invention is to provide a modular multi-level inverter island switching control method for solving the problem that the prior art does not have a reliable island switching control method.
  • the solution of the present invention includes: a modular multilevel converter island switching control method, the inverter controller adopts a double loop dQ axis decoupling control, and the inner loop is an inverter output current loop. In the grid-connected control mode, it is a DC voltage loop or an AC active and reactive loop connected to the outer loop. In the off-grid control mode, it is an AC voltage loop.
  • the island switching method includes the following steps: 1) The inverter is connected to the grid, when the island occurs: disconnect the inverter from the external grid and connect the circuit breaker; switch the outer loop to the off-grid AC voltage outer loop, the current inner loop command value before the memory switch and The grid voltage amplitude and phase are respectively used as the initial value of the outer loop regulator output and the initial value of the AC voltage command during switching; the AC voltage command is gradually adjusted to operate the inverter in a control mode in which the output voltage is equal to the rated grid voltage;
  • the inverter is operated in off-grid mode.
  • the grid returns to normal: Adjust the converter output AC voltage to track the grid voltage; When the converter output AC voltage and grid voltage are both amplitude and phase difference less than or equal to corresponding After the predetermined value and for a certain period of time, close the grid connection breaker; switch the outer loop to the grid-connected outer loop, and store the inverter output power/DC voltage and current inner loop command value before the memory switch, respectively.
  • the loop command value and the outer loop regulator output initial value; gradually adjust the outer loop command to the reference value to make the inverter run on the grid.
  • the AC voltage control loop D-axis command is the initial value of the grid voltage before the switching, and then gradually adjusted to the rated grid voltage amplitude with a certain length; the AC voltage control loop Q-axis command remains unchanged at 0V.
  • the angle to be referenced when performing the coordinate transformation is the initial value of the grid voltage before the switching, and then integrated at a constant angular velocity of 314.16 rad/s.
  • the grid-connected outer loop D-axis command is used to store the pre-switching pre-converter output active power or DC bus voltage as the initial value, and then gradually adjust to the reference value with a certain length;
  • the grid-connected outer loop Q-axis The command outputs the reactive power as the initial value before the switching of the memory, and then gradually adjusts to the reference value with a certain length;
  • the reference angle required for the coordinate transformation is the angle obtained by phase-locking the grid voltage.
  • the invention adopts constant power/DC voltage control when grid-connected, and adopts constant AC voltage control when off-grid, and realizes mode switching by changing the converter control structure.
  • the grid-connected operation control method and the off-grid operation control method of the converter involved in the present invention are relatively mature control methods, and a reasonable control structure is adopted. Switching can achieve island switching of the converter.
  • the method is simple in principle and simple in implementation, and ensures smooth switching between the modular multi-level converter in off-grid and grid-connected mode, and does not cause power interruption to the local load, and satisfies the safe and reliable power supply of the power system. Requirements.
  • Figure 1 is a control structure diagram of the present invention
  • FIG. 2 is a schematic diagram of an operation mode and a control target of the present invention
  • Figure 3 is a schematic diagram of coordinate transformation
  • Figure 4 is a flow chart showing the implementation of the present invention.
  • the control structure of the modular multilevel converter system is shown in Figure 1.
  • the DC side of the converter is connected to the DC bus of the flexible DC transmission system, and the AC is connected to the local load.
  • the inverter is connected to the grid through the grid connection breaker. When the breaker is closed, the converter is connected to the grid, and the local load connected to it can be simultaneously powered by the inverter and the grid; when the breaker is disconnected The converter is switched to the off-grid mode, and the local load connected to it is independently powered by the inverter.
  • Figure 1 also shows the main circuit structure of the modular multilevel converter.
  • the six bridge arms of the main power module each contain the same number of submodules and one bridge arm reactor, which are connected by a three-phase inverter bridge structure.
  • the voltage level is adjusted to the grid voltage via a power transformer.
  • the control mode of the fixed DC bus voltage combined with the reactive power is adopted.
  • the control mode of the fixed power and the fixed reactive power is adopted.
  • the inverter is running off-grid, the AC bus voltage must be stabilized, so the constant AC bus voltage control is used.
  • the operating mode and control objectives are shown in Figure 2.
  • the modular multi-level converter controller must be designed with a suitable coordinate system.
  • the present invention selects the coordinate system shown in Figure 3, where abc is a three-phase stationary coordinate system, which is a two-phase stationary coordinate system, and dQ is two identical. ⁇ Rotate the coordinate system, and the direction of rotation is counterclockwise.
  • a voltage/power, current double closed-loop control structure is used.
  • the outer ring D-axis command is DC bus voltage reference command Udc_ref or active power command P-ref as required
  • Q axis command is reactive power reference command Q_ref
  • Q axis output is used as inner ring D, Q Axis instructions.
  • the feedback amount of each control loop is obtained by changing the measured phase and the phase of the grid voltage obtained by phase-locking.
  • the inner loop output D and Q axis components are combined with the grid voltage phase by ipark transformation to obtain the three-phase modulation degree.
  • NLM nearest level modulation
  • the voltage equalization strategy are performed, and the driving signals of the respective submodules are obtained to realize the converter. control.
  • the double-closed-loop control structure is still used, the control inner loop remains unchanged, and the outer-loop D-axis command is the desired peak value of the AC bus voltage.
  • the Q-axis command is set to 0, and the feedback amount of each control loop is obtained from the measured voltage and current value using the reference angle obtained by integrating the grid voltage rated frequency of 50 Hz. The angle is obtained as the inner loop output D and Q-axis commands. The ipark transform angle. Control allows the AC voltage vector to always be on the D-axis.
  • the modular multilevel converter When the grid fails, the modular multilevel converter needs to switch from the grid-connected mode to the off-grid mode; when the grid returns to normal, the modular multilevel converter needs to adjust its AC voltage amplitude and phase. Move closer to the grid voltage and switch back to the grid-connected mode of operation from the off-grid mode of operation.
  • the operation of switching the inverter from the grid-connected mode to the off-network mode and from the off-network mode to the grid-connected mode will be described in detail with reference to FIG.
  • step S110 the converter is in the grid-connected operation mode
  • step S120 if the inverter detects that an island is generated, step S230 is performed, otherwise the S110 is maintained unchanged;
  • step S130 the grid-connected circuit breaker is disconnected, the converter and its local load are disconnected from the grid at step S140, and the inverter grid-connected outer loop is switched to the off-grid AC voltage outer loop.
  • the off-grid AC voltage outer ring D-axis command is the grid voltage amplitude stored before switching
  • the off-grid AC voltage Q-axis command 0 the initial value of the voltage outer loop D-axis output is the current inner loop D-axis command value stored before switching
  • the initial value of the voltage outer loop Q-axis output is the current inner loop Q-axis command value memorized before switching.
  • the phase value of the grid voltage stored before the switching is taken as the initial value of the rotation coordinate transformation angle when the network is controlled;
  • step S150 the off-grid AC voltage outer loop D-axis command is adjusted to slowly change from the initial value to the grid voltage rated amplitude, and the Q-axis command remains unchanged at 0V.
  • the grid voltage rated frequency is integrated, and the integral value is added to the grid voltage phase value memorized before the switching, as the rotation coordinate transformation angle value after the off-grid operation;
  • step S210 the converter is in an off-network operation mode
  • step S220 if the inverter detects that the power grid is back to normal, step S230 is performed, otherwise the maintenance S210 is unchanged;
  • step S230 the voltage amplitude and phase outputted by the converter are made to be different from the detected grid voltage amplitude and phase, and the amplitude of the output voltage of the converter is adjusted correspondingly according to the difference between the phase and the amplitude. frequency.
  • the amplitude difference between the two is less than 0, slowly increase the inverter AC voltage D-axis command until it is the same as the grid voltage amplitude, otherwise slowly reduce the inverter AC voltage D-axis command until it is the same as the grid voltage amplitude;
  • the phase difference between 0 ° and 180 ° is low, slowly reduce the frequency at which the inverter is used to integrate the reference angle. Otherwise, if the phase difference is between -180 ° and 0 ° °, increase the frequency slowly. .
  • step S240 if the amplitude and phase difference values of the converter output voltage and the grid voltage are both less than the corresponding predetermined value and continue for a certain time, proceed to step S250, otherwise the maintenance S230 is unchanged; the predetermined value is Depending on the impact of different island switching shocks, both are small values.
  • step S250 closing the grid connection breaker
  • step S260 the inverter off-grid AC voltage outer loop is switched to the grid-connected outer loop.
  • the D-axis command of the grid-connected outer ring is the DC bus voltage or the output active power memorized before switching.
  • the Q-axis command of the grid-connected outer loop is the output reactive power value of the memory before switching, and the initial value of the outer-axis D-axis output is The current inner loop D-axis command value memorized before switching, and the initial value of the outer loop Q-axis output is the current inner loop Q-axis command value memorized before switching.
  • the reference angle of the rotation coordinate change after switching is switched to the grid voltage lock The angle obtained by the phase;
  • step S270 the D-axis command of the grid-connected outer ring is adjusted to slowly change from the initial value to the predetermined DC bus voltage command or the output active power command, and the Q-axis command of the grid-connected outer loop is adjusted to slowly change from the initial value.
  • the phase of the grid voltage obtained by phase locking is the angle value of the rotation coordinate change;
  • Step S130 starts the operation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un procédé de commande de commutation d'îlot destiné à un convertisseur modulaire à multiples niveaux. Le procédé comprend les étapes suivantes : lorsqu'un îlot se forme, débrancher un coupe-circuit d'interconnexion connecté au réseau entre un convertisseur et un réseau électrique externe (S130); commuter une boucle externe de commande connectée au réseau du convertisseur vers une boucle externe de tension alternative hors réseau; lorsqu'un réseau électrique revient à la normale, régler une tension alternative de sortie du convertisseur afin de lui permettre de suivre une tension de réseau électrique (S230); une fois qu'une différence d'amplitude et une différence de phase des deux sont inférieures ou égales à des valeurs prédéfinies respectives et quand cette situation dure pendant une période spécifiée, commuter sur le coupe-circuit d'interconnexion connecté au réseau (S250); et commuter de nouveau la boucle externe de commande vers une boucle de commande d'origine connectée au réseau. Le procédé garantit la commutation sans interruption entre un mode hors réseau et un mode connecté au réseau d'un convertisseur modulaire à multiples niveaux, sans provoquer d'interruption d'alimentation de la charge locale, ce qui satisfait les exigences d'une alimentation en énergie électrique sûre, fiable et de grande qualité pour un système d'alimentation électrique.
PCT/CN2013/088469 2013-11-15 2013-12-03 Procédé de commande de commutation d'îlot pour convertisseur modulaire à multiples niveaux Ceased WO2015070493A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310572484.2 2013-11-15
CN201310572484.2A CN103647286A (zh) 2013-11-15 2013-11-15 一种模块化多电平换流器孤岛切换控制方法

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Publication Number Publication Date
WO2015070493A1 true WO2015070493A1 (fr) 2015-05-21

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CN106786592A (zh) * 2017-01-13 2017-05-31 全球能源互联网研究院 一种适用于柔性直流输电系统的孤岛切换控制方法和装置
CN110034586A (zh) * 2019-05-10 2019-07-19 中国石油大学(华东) 一种mmc-hvdc孤岛电网有源/无源切换控制方法
CN110233500A (zh) * 2019-06-24 2019-09-13 上海电力学院 虚拟同步发电机离网切换到并网的方法
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