WO2012010056A1 - Transformer-free battery energy storage topological structure - Google Patents

Transformer-free battery energy storage topological structure Download PDF

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Publication number
WO2012010056A1
WO2012010056A1 PCT/CN2011/076861 CN2011076861W WO2012010056A1 WO 2012010056 A1 WO2012010056 A1 WO 2012010056A1 CN 2011076861 W CN2011076861 W CN 2011076861W WO 2012010056 A1 WO2012010056 A1 WO 2012010056A1
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Prior art keywords
energy storage
battery energy
parallel
power
series
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PCT/CN2011/076861
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French (fr)
Chinese (zh)
Inventor
魏西平
杨洋
赵淑玉
张坤
张跃平
胡涛
李太峰
王振
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荣信电力电子股份有限公司
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Publication of WO2012010056A1 publication Critical patent/WO2012010056A1/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
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • 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 battery energy storage topology, which is used in the field of high voltage power systems to provide a reliable and high quality voltage to the grid. Background technique
  • 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 battery energy storage topology, which is connected in parallel on the power grid, can suppress the power pollution of the power grid, can compensate the instability of photovoltaic or wind power generation, and provide uninterrupted and clean load on the power grid. , stable, frequency-free mutation, high quality sine wave voltage.
  • a transformerless battery energy storage topology the topology comprises three phases, each phase is connected in series by a plurality of H-bridge power modules and battery energy storage modules, and is connected to the 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 battery energy storage module is formed by connecting a battery pack and a switch in series, and then connected in parallel with the capacitance of the H-bridge power module.
  • the switch also has a resistor in parallel.
  • Battery energy storage has high energy efficiency, fast charge and discharge, and long life.
  • Figure 1 is a topological structure diagram of a transformerless battery energy storage
  • Figure 2 is a block diagram of the basic unit structure of a transformerless battery energy storage topology. detailed description
  • a transformerless battery energy storage topology the topology includes three phases, each phase is connected in series by a plurality of H-bridge power modules and battery energy storage modules, and is connected to the grid via a 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 four switching devices: IGBT1, IGBT2, IGBT3, and IGBT4.
  • 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.
  • four switching devices IGBT1, IGBT2, IGBT3, and IGBT4 are respectively connected in parallel with one of the reversed diodes D1, D2, D3, and D4.
  • the common end of IGBT1 and IGBT2, and the common end of IGBT3 and IGBT4 are the input and output terminals of the power module connected to other power modules.
  • the battery energy storage module is formed by connecting the battery pack E and the switch S in series, and then connected in parallel with the capacitor C of the H-bridge power module, and the switch S is also connected in parallel with a resistor.
  • Figure 1 uses a multi-power unit to output a high voltage in series, and outputs a multi-level waveform through a modulation algorithm to generate a high-quality sine wave voltage to supply a load on the grid.
  • the battery storage topology of the present invention has a DC side capacitor and the battery absorbs the power grid spike, and further The effect of grid spikes on equipment on the grid is suppressed.
  • S is turned on by controlling each of the IGBT1 ⁇ IGBT4 of each unit (as shown in Figure 2).
  • the DC side capacitor and the energy in the battery are fed back to the grid, so that the grid outputs a normal sine wave.
  • IGBT1 ⁇ IGBT4 are turned off, and switch S is turned off. At this time, energy is stored in the battery.
  • the battery energy storage topology of the invention can be used as a reserve power source for the power grid of 1 ⁇ 500KV, which can suppress the instability of wind power generation or photovoltaic power generation.
  • the important feature is that the input end has no transformer, small volume and low cost.
  • the battery energy storage topology uses a series connection method to output high voltage, which saves the step-up transformer used in grid connection, saves a lot of cost and is simple in topology, easy to disassemble and install.
  • the unit is an H-bridge module comprising four IGBT devices, each of which constitutes a bridge, each module further comprising a DC filter capacitor and a battery in parallel with the capacitor. When it is necessary to increase the voltage level, it is only necessary to increase the number of cells connected in series.
  • the multi-cell series power unit outputs high voltage, a multi-level waveform can be output through a modulation algorithm to generate a high-quality sine wave voltage.
  • the H-bridge power module includes four IGBT devices that form a rectivable and reversible bridge, and the rear switch S controls the battery to absorb or discharge electrical energy.
  • the switch S is a high-speed shutdown device, such as an IGBT, the resistor in parallel with it can be omitted.
  • the invention is simpler to increase or decrease the capacity according to actual needs, and only needs to increase or decrease the number of units.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A transformer-free battery energy storage topological structure comprising three phases, wherein each phase comprises multiple sub units connected in series, and is connected to a power grid via a buffer inductor. The sub-units are each constituted by an H-bridge power module and a battery energy storage module. The H-bridge power module is formed with four IGBT switches. Each IGBT switch runs antiparallel to a diode. Two IGBT switches are connected in series and then the pair is connected in parallel to a direct current capacitor. The battery energy storage module is formed by a battery unit and a switch connected in series, and is connected in parallel to a direct current capacitor of the H-bridge power module. The switches are each connected in parallel to a resistor. Connected in parallel to a power grid, the topological structure suppresses power contamination to the power grid, and compensates the instability of photovoltaic or wind power, thus providing to a power grid load a continuous, clean, stable, and high-quality sine-wave voltage free of frequency discontinuity.

Description

一种无变压器电池储能拓扑结构  Transformerless battery energy storage topology
技术领域 Technical field
本发明涉及一种无变压器电池储能拓扑结构， 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 battery energy storage topology, which is used in the field of high voltage power systems to provide a reliable and high quality voltage to the grid. 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无变压器电池储能拓扑，其并联在电网上， 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。  The object of the present invention is to provide a transformerless battery energy storage topology, which is connected in parallel on the power grid, can suppress the power pollution of the power grid, can compensate the instability of photovoltaic or wind power generation, and provide uninterrupted and clean load on the power grid. , stable, frequency-free mutation, high quality sine wave voltage.
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:
一种无变压器电池储能拓扑结构， 该拓扑结构包括三相， 每相由多个 H桥功率 模块与电池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 battery energy storage topology, the topology comprises three phases, each phase is connected in series by a plurality of H-bridge power modules and battery energy storage modules, and is connected to the 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.
所述的电池储能模块由电池组与开关串联而成， 再与 H桥功率模块的电容并联。 所述的开关还并联有电阻。  The battery energy storage module is formed by connecting a battery pack and a switch in series, and then connected in parallel with the capacitance of the H-bridge power module. The switch also has a resistor in parallel.
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， 进而使该电池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 battery 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 floor space is reduced by half. , convenient transportation and simple structure;
2) 电池储能具有能量效率高， 可实现快速充放电， 寿命长。  2) Battery energy storage has high energy efficiency, fast charge and discharge, and long life.
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  3) It is relatively simple to reduce or increase the capacity level, just reduce or increase the number of units connected in series. DRAWINGS
图 1是无变压器电池储能拓扑结构图; 图 2是无变压器电池储能拓扑基本单元结构图。 具体实施方式 Figure 1 is a topological structure diagram of a transformerless battery energy storage; Figure 2 is a block diagram of the basic unit structure of a transformerless battery energy storage topology. detailed description
见图 1， 一种无变压器电池储能拓扑结构， 该拓扑结构包括三相， 每相由多个 H 桥功率模块与电池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 Fig. 1, a transformerless battery energy storage topology, the topology includes three phases, each phase is connected in series by a plurality of H-bridge power modules and battery energy storage modules, and is connected to the grid via a 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 IGBT1、 IGBT2、 IGBT3、 IGBT4四个开关器件组成， 开关器件 IGBT1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 Dl、 D2、 D3、 D4。 IGBT1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 four switching devices: IGBT1, IGBT2, IGBT3, and IGBT4. 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 respectively connected in parallel with one of the reversed diodes D1, D2, D3, and D4. The common end of IGBT1 and IGBT2, and the common end of IGBT3 and IGBT4 are the input and output terminals of the power module connected to other power modules.
电池储能模块由电池组 E与开关 S串联而成，再与 H桥功率模块的电容 C并联， 开关 S还并联有电阻 。  The battery energy storage module is formed by connecting the battery pack E and the switch S in series, and then connected in parallel with the capacitor C of the H-bridge power module, and the switch S is also connected in parallel with a resistor.
当电网输出电压不正常时， 图 1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, Figure 1 uses a multi-power unit to output a high voltage in series, and outputs a multi-level waveform through a modulation algorithm to generate a high-quality sine wave voltage to supply a load on the grid.
当电网电压产生尖峰时， 电压通过二极管向直流侧供电， 开通每个单元 （如图 2 所示） 的开关 S， 此时， 本发明的电池储能拓扑直流侧电容和电池吸收电网尖峰， 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， 开通 S， 此时， 直流侧电容和电池中的能 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， 关断开关 S， 此时， 能量储存在电池中。  When the grid voltage spikes, the voltage is supplied to the DC side through the diode, and the switch S of each unit (as shown in FIG. 2) is turned on. At this time, the battery storage topology of the present invention has a DC side capacitor and the battery absorbs the power grid spike, and further The effect of grid spikes on equipment on the grid is suppressed. When the grid voltage suddenly drops or is interrupted, S is turned on by controlling each of the IGBT1~IGBT4 of each unit (as shown in Figure 2). At this time, the DC side capacitor and the energy in the battery are fed back to the grid, so that the grid outputs a normal sine wave. . When the grid voltage is normal, IGBT1~IGBT4 are turned off, and switch S is turned off. At this time, energy is stored in the battery.
本发明的电池储能拓扑可为 1〜500KV的电网做储备电源， 可抑制风力发电或光 伏发电的不稳定性， 其重要特征为输入端无变压器， 体积小， 成本低。 该电池储能拓 扑通过单元串联的方法， 输出高压， 省掉了并网时所用的升压变压器， 节约了大量成 本且拓扑结构简单，易于拆卸和安装。所述的单元为 H桥型模块包括四个 IGBT器件， 每两个构成一个桥，每个模块还包括直流滤波电容以及与电容相并联的电池。当需要 提高电压等级时， 只需要提高串联的单元数目即可。 另外， 由于采用多单元串联功率 单元输出高压， 可以通过调制算法输出多电平波形， 产生高质量的正弦波电压。  The battery energy storage topology of the invention can be used as a reserve power source for the power grid of 1~500KV, which can suppress the instability of wind power generation or photovoltaic power generation. The important feature is that the input end has no transformer, small volume and low cost. The battery energy storage topology uses a series connection method to output high voltage, which saves the step-up transformer used in grid connection, saves a lot of cost and is simple in topology, easy to disassemble and install. The unit is an H-bridge module comprising four IGBT devices, each of which constitutes a bridge, each module further comprising a DC filter capacitor and a battery in parallel with the capacitor. When it is necessary to increase the voltage level, it is only necessary to increase the number of cells connected in series. In addition, since the multi-cell series power unit outputs high voltage, a multi-level waveform can be output through a modulation algorithm to generate a high-quality sine wave voltage.
所述的 H桥功率模块包括四个 IGBT器件，其构成了一个可整流可逆变的桥，后 面的开关 S控制电池吸收或释放电能。 当开关 S为高速可关断器件， 如 IGBT时， 还 可省掉与其相并联的电阻。  The H-bridge power module includes four IGBT devices that form a rectivable and reversible bridge, and the rear switch S controls the battery to absorb or discharge electrical energy. When the switch S is a high-speed shutdown device, such as an IGBT, the resistor in parallel with it can be omitted.
本发明根据实际需要提高或减小容量比较简单， 只需增多或减少单元数目即可。  The invention is simpler to increase or decrease the capacity according to actual needs, and only needs to increase or decrease the number of units.

Claims

1、 一种无变压器电池储能拓扑结构， 其特征在于， 该拓扑结构包括三相， 每相 由多个 H桥功率模块与电池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 battery energy storage topology, characterized in that the topology comprises three phases, each phase is connected in series by a plurality of H-bridge power modules and battery energy storage modules, and is connected via a buffer inductor. Grid.
2、 根据权利要求 1所述的无变压器电池储能拓扑结构， 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 battery 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所述的无变压器电池储能拓扑结构， 其特征在于， 所述 的电池储能模块由电池组与开关串联而成， 再与 H桥功率模块的电容并联。  3. The transformerless battery energy storage topology according to claim 1 or 2, wherein the battery energy storage module is formed by connecting a battery pack and a switch in series, and is further connected in parallel with a capacitance of the H-bridge power module.
4、 根据权利要求 3所述的无变压器电池储能拓扑结构， 其特征在于， 所述的开 关还并联有电阻。  4. The transformerless battery energy storage topology of claim 3, wherein the switch further has a resistor in parallel.
PCT/CN2011/076861 2010-07-22 2011-07-05 Transformer-free battery energy storage topological structure WO2012010056A1 (en)

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