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WO2012010057A1 - A transformerless inductive energy storage topology structure - Google Patents

A transformerless inductive energy storage topology structure Download PDF

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Publication number
WO2012010057A1
WO2012010057A1 PCT/CN2011/076864 CN2011076864W WO2012010057A1 WO 2012010057 A1 WO2012010057 A1 WO 2012010057A1 CN 2011076864 W CN2011076864 W CN 2011076864W WO 2012010057 A1 WO2012010057 A1 WO 2012010057A1
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Prior art keywords
energy storage
diode
igbt
power
superconducting coil
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PCT/CN2011/076864
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French (fr)
Chinese (zh)
Inventor
魏西平
赵淑玉
张跃平
胡涛
张坤
李太峰
杨洋
王振
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Rongxin Power Electronic Co Ltd
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Rongxin Power Electronic Co Ltd
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Publication of WO2012010057A1 publication Critical patent/WO2012010057A1/en
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    • 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
    • H02J15/00—Systems for storing electric energy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Definitions

  • the invention relates to a transformerless inductor energy storage topology, which can be used in the field of high voltage power systems, so that the grid can supply a reliable and high quality voltage.
  • the power storage equipment is connected in parallel with the power grid through the transformer.
  • the transformer is used to make the equipment investment large, occupy a large area, high cost and long production cycle. Summary of the invention
  • the object of the present invention is to provide a transformerless inductor energy storage topology based on MMC modular multi-level, which is connected in parallel on the power grid, has no transformer at the input end, is small in size, light in weight and low in cost; those which can suppress the power grid Power pollution can compensate for the instability of photovoltaic or wind power generation, providing uninterrupted, clean, stable, frequency-free, high-quality sine wave voltage to the load on the grid; and high conversion efficiency and fast response.
  • a transformerless inductive energy storage topology structure includes three phases, each phase is connected in series by a plurality of H-bridge power modules and sub-units composed of an inductor energy storage module, and is connected to the power grid via a buffer inductor.
  • the H-bridge power module is composed of four IGBT switching devices, and each IGBT switching device is anti-parallel to a diode. After each two IGBT switching devices are connected in series, they are connected in parallel with the DC capacitor C.
  • the inductive energy storage module is composed of a superconducting coil Lc, a switching device IGBT5, a switching device IGBT6, and diodes D1 and D2.
  • the superconducting coil Lc and the diode D1 and the switching device IGBT5 form a storage energy circuit, and the superconducting coil Lc is also connected with a diode. D2.
  • the switching device IGBT6 constitutes a storage energy circuit, and the inductive energy storage module is connected in parallel with the capacitor C.
  • Figure 1 is a topological structure diagram of a transformerless inductor energy storage
  • Figure 2 is a basic unit structure diagram of a transformerless inductor energy storage topology. detailed description
  • a transformerless inductor energy storage topology the topology includes three phases, each phase is connected in series by a plurality of H-bridge power modules and sub-units of the inductor energy storage module, and is connected to the grid via the buffer inductor L. .
  • Inductor L is also connected to the snubber resistor R.
  • the snubber resistor R is connected in parallel with the switch K2 and connected to the circuit breaker K1.
  • the H-bridge power module is composed of switching devices IGBT1, IGBT2, IGBT3, IGBT4, and the switching device IGBT1 and IGBT2 are connected in series, and the switching device IGBT3 and IGBT4 are connected in series, and then connected in parallel with the DC capacitor C. And four switching devices IGBT1, IGBT2, IGBT3, and IGBT4 are connected in parallel with one of the reversed diodes D11, D22, D33, and D44.
  • the common terminal of IGBT1 and IGBT2, and the common terminal of IGBT3 and IGBT4 are the input and output terminals of the power module connected to other power modules.
  • the inductor energy storage module consists of a superconducting coil Lc, a switching device IGBT5, a switching device IGBT6, a diode Dl,
  • switching device IGBT5 constitute a storage energy loop
  • superconducting coil Lc and diode D2 switching device IGBT6 constitute a storage energy loop
  • the inductor energy storage module is connected in parallel with capacitor C .
  • the multi-power unit When the grid output voltage is abnormal, as shown in Figure 1, the multi-power unit is used to output the high voltage in series, and the multi-level waveform is output through the modulation algorithm to generate a high-quality sine wave voltage to supply the load on the grid.
  • the voltage is supplied to the DC side through the diodes D11 and D44 and the IGBT 5 and the IGBT 6.
  • the inductor energy storage topology DC side capacitor C and the superconducting coil Lc absorb the power grid spike. This in turn inhibits the impact of grid spikes on equipment on the grid.
  • the IGBT5 and IGBT6 are turned off by controlling the IGBT1 ⁇ IGBT4 of each unit (as shown in FIG. 2).
  • the energy in the DC side capacitor C and the superconducting coil Lc is fed back to the grid. Make the grid output a normal sine wave.
  • IGBT1 ⁇ IGBT4 When the grid voltage is normal, IGBT1 ⁇ IGBT4 are turned off, and IGBT5 or IGBT6 is turned on. At this time, the current in the superconducting coil Lc forms a loop through D1 and IGBT5, or a loop is formed through D2 and IGBT6, and energy is stored in the superconducting coil Lc. .
  • the transformerless inductor energy storage topology of the invention can be used as a reserve power source for a grid of 1 ⁇ 500KV, and the input end has no transformer.
  • the inductor energy storage topology of the invention adopts superconducting energy storage, compared with the storage of the battery, the energy storage of the flywheel and the like.
  • superconducting energy storage has the advantages of high conversion efficiency and fast response speed, and can not only adjust the active power, but also adjust the reactive power, and can also perform independent control of reactive power at the same time. Very flexible. This allows the superconducting energy storage device to function to improve the stability of the power system. When you need to increase the voltage level, you only need to increase the number of cells in series.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A transformerless inductive energy storage topology structure includes three phases. Each phase comprises a plurality of subunits which are connected in series, and is connected to the power grid via a buffer inductor (L). Each subunit is composed of an H-bridge power module and an inductive energy storage module. The inductive energy storage module consists of a superconducting coil (Lc), a switching element (IGBT 5), a switching element (IGBT 6), a diode (Dl) and a diode (D2). The superconducting coil (Lc), the diode (Dl) and the switching element (IGBT 5) constitute an energy storage loop; and the superconducting coil (Lc), the diode (D2) and the switching element (IGBT 6) constitute another energy storage loop. The inductive energy storage module is connected in parallel with the capacitor (C). The topology structure is connected in parallel to the power grid, with no transformer at the input side, and has a small size, light weight and low cost. The topology structure can suppress the power pollution of the power grid, compensate the instability of the photovoltaic or wind power generation, provide the load of the power grid with an uninterruptible, clean, stable, frequency-continuous, and high quality sinusoidal wave voltage. The topology structure has high conversion efficiency and a fast response speed.

Description

一种无变压器电感储能拓扑结构  Transformerless inductor energy storage topology

技术领域 Technical field

本发明涉及一种无变压器电感储能拓扑结构， 可用于高压电力系统领域， 使电 网供给负载可靠， 高质量的电压。 背景技术  The invention relates to a transformerless inductor energy storage topology, which can be used in the field of high voltage power systems, so that the grid can supply a reliable and high quality voltage. Background technique

目前， 电网至少存在以下九种问题： 断电、 雷击尖峰、 浪涌、 频率震荡、 电压突 变、 电压波动、 频率漂移、 电压跌落、 脉冲干扰等。 可再生能源例如光伏或风能所产 生的电能也极其的不稳定， 新能源并网应用的规模越大， 电网就越不安全， 根据国内 外风光电站并网的实践，借助储能技术可以实现新能源发电功率的平衡输出，使大规 模风电及太阳能电力方便可靠地并入常规电网。  At present, there are at least nine problems in the grid: power outages, lightning spikes, surges, frequency oscillations, voltage surges, voltage fluctuations, frequency drift, voltage dips, pulsed disturbances, etc. The energy generated by renewable energy sources such as photovoltaics or wind energy is also extremely unstable. The larger the scale of new energy grid-connected applications, the more unsafe the power grid. According to the practice of grid connection of wind and light power stations at home and abroad, new energy storage technologies can be realized. The balanced output of energy generation power enables large-scale wind power and solar power to be easily and reliably integrated into conventional power grids.

目前电力储能设备都是通过变压器与电网相并联的，采用变压器，使设备投资大、 占地多， 成本高， 生产周期长。 发明内容  At present, the power storage equipment is connected in parallel with the power grid through the transformer. The transformer is used to make the equipment investment large, occupy a large area, high cost and long production cycle. Summary of the invention

本发明的目的是提供一种基于 MMC 模块化多电平的无变压器电感储能拓扑结 构， 该拓扑并联在电网上， 输入端无变压器， 体积小、 重量轻、 成本低； 可抑制电网 的那些电力污染， 可补偿光伏或风能发电的不稳定性， 给电网上的负载提供不间断、 干净、 稳定、 无频率突变、 高质量的正弦波电压； 且转换效率高、 响应速度快。  The object of the present invention is to provide a transformerless inductor energy storage topology based on MMC modular multi-level, which is connected in parallel on the power grid, has no transformer at the input end, is small in size, light in weight and low in cost; those which can suppress the power grid Power pollution can compensate for the instability of photovoltaic or wind power generation, providing uninterrupted, clean, stable, frequency-free, high-quality sine wave voltage to the load on the grid; and high conversion efficiency and fast response.

为实现上述目的， 本发明通过以下技术方案实现：  To achieve the above object, the present invention is achieved by the following technical solutions:

一种无变压器电感储能拓扑结构， 该拓扑结构包括三相， 每相由多个 H桥功率 模块与电感储能模块构成的子单元串联在一起， 经缓冲电感接入电网。  A transformerless inductive energy storage topology structure, the topology includes three phases, each phase is connected in series by a plurality of H-bridge power modules and sub-units composed of an inductor energy storage module, and is connected to the power grid via a buffer inductor.

所述的 H桥功率模块由四个 IGBT开关器件组成，每个 IGBT开关器件反并联一 个二极管， 每两个 IGBT开关器件相串联后， 再与直流电容 C并联。  The H-bridge power module is composed of four IGBT switching devices, and each IGBT switching device is anti-parallel to a diode. After each two IGBT switching devices are connected in series, they are connected in parallel with the DC capacitor C.

所述的电感储能模块由超导线圈 Lc、 开关器件 IGBT5、 开关器件 IGBT6、 二极 管 Dl、 D2组成， 超导线圈 Lc与二极管 Dl、 开关器件 IGBT5构成存储能量回路， 超导线圈 Lc还与二极管 D2、 开关器件 IGBT6构成存储能量回路， 该电感储能模块 与电容 C相并联。  The inductive energy storage module is composed of a superconducting coil Lc, a switching device IGBT5, a switching device IGBT6, and diodes D1 and D2. The superconducting coil Lc and the diode D1 and the switching device IGBT5 form a storage energy circuit, and the superconducting coil Lc is also connected with a diode. D2. The switching device IGBT6 constitutes a storage energy circuit, and the inductive energy storage module is connected in parallel with the capacitor C.

与现有技术相比， 本发明的有益效果是：  Compared with the prior art, the beneficial effects of the present invention are:

1 ) 输入端无变压器， 进而使该电感储能拓扑装置与同电压、 功率等级下的有变 压器的相比较， 生产周期减小一半， 体积减小一半， 成本降低一半， 占地面积减小一 半， 运输方便， 结构简单；  1) There is no transformer at the input end, so that the inductor energy storage topology device is compared with the transformer with the same voltage and power level, the production cycle is reduced by half, the volume is reduced by half, the cost is reduced by half, and the footprint is reduced by half. , convenient transportation and simple structure;

2) 不采用蓄电池储能， 采用的超导储能具有转换效率高、 响应速度快的优点； 3 ) 减小或提高容量等级比较简单， 只需减少或增多串联的单元数目即可。 附图说明 2) Without the storage energy of the battery, the superconducting energy storage has the advantages of high conversion efficiency and fast response speed; 3) It is relatively simple to reduce or increase the capacity level, and only need to reduce or increase the number of units connected in series. DRAWINGS

图 1是无变压器电感储能拓扑结构图；  Figure 1 is a topological structure diagram of a transformerless inductor energy storage;

图 2是无变压器电感储能拓扑基本单元结构图。 具体实施方式  Figure 2 is a basic unit structure diagram of a transformerless inductor energy storage topology. detailed description

见图 1， 一种无变压器电感储能拓扑结构， 该拓扑结构包括三相， 每相由多个 H 桥功率模块与电感储能模块构成的子单元串联在一起，经缓冲电感 L接入电网。电感 L还连接缓冲电阻 R， 缓冲电阻 R与开关 K2并联后， 与断路器 K1连接。  See Figure 1, a transformerless inductor energy storage topology, the topology includes three phases, each phase is connected in series by a plurality of H-bridge power modules and sub-units of the inductor energy storage module, and is connected to the grid via the buffer inductor L. . Inductor L is also connected to the snubber resistor R. The snubber resistor R is connected in parallel with the switch K2 and connected to the circuit breaker K1.

见图 2， H桥功率模块由开关器件 IGBT1、 IGBT2、 IGBT3、 IGBT4组成， 开关 器件 IGBTl和 IGBT2相串联， 开关器件 IGBT3和 IGBT4相串联， 再和直流电容 C 并联。 并且四个开关器件 IGBT1、 IGBT2、 IGBT3、 IGBT4分别并联一个反接二极管 Dll、 D22、 D33、 D44。 IGBTl与 IGBT2的公共端、 IGBT3与 IGBT4的公共端为该 功率模块与其它功率模块相连接的输入、 输出端。  As shown in Fig. 2, the H-bridge power module is composed of switching devices IGBT1, IGBT2, IGBT3, IGBT4, and the switching device IGBT1 and IGBT2 are connected in series, and the switching device IGBT3 and IGBT4 are connected in series, and then connected in parallel with the DC capacitor C. And four switching devices IGBT1, IGBT2, IGBT3, and IGBT4 are connected in parallel with one of the reversed diodes D11, D22, D33, and D44. The common terminal of IGBT1 and IGBT2, and the common terminal of IGBT3 and IGBT4 are the input and output terminals of the power module connected to other power modules.

电感储能模块由超导线圈 Lc、 开关器件 IGBT5、 开关器件 IGBT6、 二极管 Dl、 The inductor energy storage module consists of a superconducting coil Lc, a switching device IGBT5, a switching device IGBT6, a diode Dl,

D2、 D3、 D4组成， 超导线圈 Lc与二极管 Dl、 开关器件 IGBT5构成存储能量回路， 超导线圈 Lc还与二极管 D2、 开关器件 IGBT6构成存储能量回路， 该电感储能模块 与电容 C相并联。 D2, D3, D4, superconducting coil Lc and diode Dl, switching device IGBT5 constitute a storage energy loop, superconducting coil Lc and diode D2, switching device IGBT6 constitute a storage energy loop, the inductor energy storage module is connected in parallel with capacitor C .

当电网输出电压不正常时， 如图 1所示采用多功率单元串联输出高压，通过调制 算法输出多电平波形， 产生高质量的正弦波电压供给电网上的负载。  When the grid output voltage is abnormal, as shown in Figure 1, the multi-power unit is used to output the high voltage in series, and the multi-level waveform is output through the modulation algorithm to generate a high-quality sine wave voltage to supply the load on the grid.

当电网电压产生尖峰时， 电压通过二极管 Dll、 D44以及 IGBT5、 IGBT6向直流 侧供电， 如图 2所示， 此时， 本发明电感储能拓扑直流侧电容 C和超导线圈 Lc吸收 电网尖峰，进而抑制了电网尖峰对电网上设备的影响。当电网电压突然跌落或中断时， 通过控制每个单元 （如图 2所示） 的 IGBT1〜IGBT4， 关断 IGBT5、 IGBT6, 此时， 直流侧电容 C和超导线圈 Lc中的能量回馈电网， 使电网输出正常的正弦波。 当电网 电压正常时， 关断 IGBT1〜IGBT4， 开通 IGBT5或 IGBT6, 此时， 超导线圈 Lc中的 电流通过 D1和 IGBT5形成回路，或通过 D2和 IGBT6形成回路，能量储存在超导线 圈 Lc中。  When the grid voltage spikes, the voltage is supplied to the DC side through the diodes D11 and D44 and the IGBT 5 and the IGBT 6. As shown in FIG. 2, at this time, the inductor energy storage topology DC side capacitor C and the superconducting coil Lc absorb the power grid spike. This in turn inhibits the impact of grid spikes on equipment on the grid. When the grid voltage suddenly drops or is interrupted, the IGBT5 and IGBT6 are turned off by controlling the IGBT1~IGBT4 of each unit (as shown in FIG. 2). At this time, the energy in the DC side capacitor C and the superconducting coil Lc is fed back to the grid. Make the grid output a normal sine wave. When the grid voltage is normal, IGBT1~IGBT4 are turned off, and IGBT5 or IGBT6 is turned on. At this time, the current in the superconducting coil Lc forms a loop through D1 and IGBT5, or a loop is formed through D2 and IGBT6, and energy is stored in the superconducting coil Lc. .

本发明的无变压器电感储能拓扑可为 1〜500KV的电网做储备电源， 且输入端无 变压器， 本发明的电感储能拓扑采用超导储能， 相对于蓄电池储能， 飞轮储能等储能 方式而言， 超导储能具有转换效率高、 响应速度快的优点， 且既可以进行有功功率的 调节， 又可进行无功功率的调节， 还可以同时进行无功有功的独立控制， 具有很高的 灵活性。这使得超导储能装置可以起到提高电力系统稳定性的作用。当需要提高电压 等级时， 只需要提高串联的单元数目即可。  The transformerless inductor energy storage topology of the invention can be used as a reserve power source for a grid of 1~500KV, and the input end has no transformer. The inductor energy storage topology of the invention adopts superconducting energy storage, compared with the storage of the battery, the energy storage of the flywheel and the like. In terms of energy mode, superconducting energy storage has the advantages of high conversion efficiency and fast response speed, and can not only adjust the active power, but also adjust the reactive power, and can also perform independent control of reactive power at the same time. Very flexible. This allows the superconducting energy storage device to function to improve the stability of the power system. When you need to increase the voltage level, you only need to increase the number of cells in series.

Claims

1、 一种无变压器电感储能拓扑结构， 其特征在于， 该拓扑结构包括三相， 每相 由多个 H桥功率模块与电感储能模块构成的子单元串联在一起， 经缓冲电感接入电 网。  A transformerless inductor energy storage topology structure, characterized in that the topology comprises three phases, each phase is connected in series by a plurality of H-bridge power modules and sub-units composed of an inductor energy storage module, and is connected through a buffer inductor Grid. 2、 根据权利要求 1所述的无变压器电感储能拓扑结构， 其特征在于， 所述的 H 桥功率模块由四个 IGBT开关器件组成， 每个 IGBT开关器件反并联一个二极管， 每 两个 IGBT开关器件相串联后， 再与直流电容 C并联。  2. The transformerless inductor energy storage topology according to claim 1, wherein the H-bridge power module is composed of four IGBT switching devices, and each IGBT switching device is anti-parallel to one diode, and each two IGBTs After the switching devices are connected in series, they are connected in parallel with the DC capacitor C. 3、 根据权利要求 1或 2所述的无变压器电感储能拓扑结构， 其特征在于， 所述 的电感储能模块由超导线圈 Lc、 开关器件 IGBT5、 开关器件 IGBT6、 二极管 Dl、 D2组成， 超导线圈 Lc与二极管 Dl、 开关器件 IGBT5构成存储能量回路， 超导线圈 Lc还与二极管 D2、 开关器件 IGBT6构成存储能量回路， 该电感储能模块与电容 C 相并联。  The transformerless energy storage topology according to claim 1 or 2, wherein the inductor energy storage module is composed of a superconducting coil Lc, a switching device IGBT5, a switching device IGBT6, and diodes D1 and D2. The superconducting coil Lc and the diode D1 and the switching device IGBT 5 constitute a storage energy circuit. The superconducting coil Lc also forms a storage energy circuit with the diode D2 and the switching device IGBT6. The inductive energy storage module is connected in parallel with the capacitor C.
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