WO2011140841A1 - 共轭多向逆变电源 - Google Patents

共轭多向逆变电源 Download PDF

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Publication number
WO2011140841A1
WO2011140841A1 PCT/CN2011/070672 CN2011070672W WO2011140841A1 WO 2011140841 A1 WO2011140841 A1 WO 2011140841A1 CN 2011070672 W CN2011070672 W CN 2011070672W WO 2011140841 A1 WO2011140841 A1 WO 2011140841A1
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WO
WIPO (PCT)
Prior art keywords
grid
inverter
power supply
energy
bus
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Application number
PCT/CN2011/070672
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English (en)
French (fr)
Inventor
李晟
王北宁
肖慧明
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珠海兴业新能源科技有限公司
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Publication of WO2011140841A1 publication Critical patent/WO2011140841A1/zh

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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
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • 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 is applied to a miniature smart grid system based on new energy generation.
  • a micro-smart grid system consisting of a series of distributed micro-power supplies, energy storage systems, and load and control systems is suitable for grid-connected access to renewable energy.
  • the core technology of the micro-smart grid system is a component that can control the multi-directional flow of energy.
  • the present invention provides a conjugate multi-directional inverter power source capable of completing multi-directional flow of energy from a public power grid, an energy storage system, a renewable energy power generation system, and a load.
  • the conjugate multi-directional inverter power supply is mainly composed of a two-way grid-connected inverter, a two-way off-grid inverter and a DC bus.
  • the two-way grid-connected inverter and the two-way off-grid inverter share one DC bus, and the energy storage device is directly connected.
  • the technical solution adopted by the present invention to solve its technical problems is:
  • the conjugate multi-directional inverter power supply is equivalent to a two-way grid-connected inverter, and the excess energy of the DC bus can be input to the public power grid through the two-way grid-connected inverter; when the renewable energy generation amount is less than the load or the battery is charged When it is necessary to take energy from the public grid, it is equivalent to a rectifier, and the electric energy flows from the public grid to the DC bus.
  • the conjugate multi-directional inverter power supply is equivalent to the two-way off-grid inverter, and the renewable energy power generation can be integrated into the output of the two-way off-grid inverter.
  • the energy generated by the renewable energy is greater than the load, the energy flows from the load end to the DC bus inside the conjugate multi-directional inverter power supply; when the energy generated by the renewable energy source is less than the load, the energy on the DC bus can also pass through the two-way The off-grid inverter flows to the load.
  • the energy storage device is directly connected to the DC busbar inside the conjugate multi-directional inverter power supply.
  • the conjugate multi-directional inverter power source can be controlled by the bidirectional grid-connected inverter to flow from the DC bus to the public power grid;
  • the energy can be controlled from the DC bus to the load by the two-way off-grid inverter; when there is excess energy in the public grid and the load, it can flow back to the energy storage device from the public grid or load.
  • Figure 1 is a topological structure diagram of a conjugate multi-directional inverter power supply.
  • the part of the dotted line in the figure (4) is a conjugate multi-directional inverter power supply body, which is composed of (1) bidirectional grid-connected inverter, (2) ) DC bus, (3) two-way off-grid inverter. (7)
  • For the public power grid connect the two-way grid-connected inverter terminal, (6) is the battery, connect the DC bus, and (5) generate power for the load and renewable energy, and merge into the two-way off-grid inverter.
  • FIG. 2 is a basic schematic diagram of a conjugate multi-directional inverter power supply, (1) is a bidirectional grid-connected inverter, and (3) is a two-way off-grid inverter.
  • (8) and (10) are isolation transformers, (9), (11) are IGBT full-bridge inverter/rectifier circuits, (2) are DC busbars, and (6) are battery packs.
  • the renewable energy source can enter the two-way off-grid inverter (3), through the isolation transformer (10) and after filtering, it is rectified by the three-phase full-bridge rectifier circuit (11) and then merged into the DC bus.
  • the public grid power supply enters the two-way grid-connected inverter (1), is filtered through the isolation transformer (2) and is rectified by the three-phase full-bridge rectifier circuit (9) and merged into the DC bus (2).
  • the electrical energy on the DC bus is inverted by the three-phase full-bridge inverter circuit (9) (11) and then transmitted to the public grid and the load through the isolating transformer (8) (10).
  • the charging/discharging of the battery pack (6) can be realized by controlling the DC bus voltage.
  • the energy flow as shown in Fig. 1 can be completed.
  • the electric energy generated by the renewable energy source (10) can be transmitted to the storage battery (6), and can also be transmitted to (2) to the public.
  • Power grid transmission; the stored energy of the battery can be transmitted to the load to supply power to the load, or can be transmitted to the public grid; the public grid can charge the battery or supply power to the load.

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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)

Description

共轭多向逆变电源
技术领域
本发明应用于基于新能源发电的微型智能电网系统。
背景技术
能源危机和环境危机日益受到关注，可再生能源的应用和推广受到人们广泛重视，可再生能源发电并网运行是新能源产业发展的趋势之一，可再生能源中的太阳能、风能等与环境气候关系密切，发电性能不稳定，直接并网容易对公共电网造成冲击。由一系列分布式微型电源、储能系统和负荷、控制系统等共同组成的微型智能电网系统适合可再生能源的并网接入，微型智能电网系统核心技术是能够控制能量多向流动的部件。
发明内容
针对微型智能电网系统设计要求，本发明提供了一种能完成能量从公共电网、储能系统、可再生能源发电系统和负载之间多向流动的共轭多向逆变电源。共轭多向逆变电源主要由双向并网逆变器、双向离网逆变器和直流母线组成，双向并网逆变器和双向离网逆变器共用一个直流母线，储能设备直接接在直流母线上，本发明解决其技术问题所采用的技术方案是：
相对于公共电网，共轭多向逆变电源相当于一个双向并网逆变器，直流母线多余能量可以通过双向并网逆变器输入公共电网；当可再生能源发电量小于负载时或蓄电池充电需要从公共电网取能量时，相当于一个整流器，电能从公共电网流向直流母线。
相对于用电负载，共轭多向逆变电源是相当于双向离网逆变器，可再生能源发电可并入双向离网逆变器的输出端。当可再生能源产生的能量大于负载时，能量从负载端流到共轭多向逆变电源内部的直流母线上；当可再生能源产生的能量小于负载时，直流母线上的能量也可以通过双向离网逆变器流向负载。
储能设备直接接在共轭多向逆变电源内部的直流母线上，当公共电网需要能量时，共轭多向逆变电源可由双向并网逆变器控制能量从直流母线流向公共电网上；当负载需要能量时，可由双向离网逆变器控制能量从直流母线流向负载；当公共电网与负载端有能量过剩时，可从公共电网或负载端流回储能设备。
附图说明
下面结合附图说明共轭多向逆变电源的结构。
图1为共轭多向逆变电源拓扑结构图，图中（4）所指虚线框中的部分为共轭多向逆变电源本体,它由（1）双向并网逆变器，（2）直流母线，（3）双向离网逆变器组成。（7）为公共电网，连接双向并网逆变器端，（6）为蓄电池，连接直流母线，（5）为负载及可再生能源发电，并入双向离网逆变器端。
图2为共轭多向逆变电源的基本原理图，（1）为双向并网逆变器，（3）为双向离网逆变器。图中（8）和（10）为隔离变压器，（9），（11）为IGBT全桥逆变\整流电路，（2）为直流母线，（6）为蓄电池组。
具体实施方案
如图2所示，可再生能源所发电能进入双向离网逆变器（3），通过隔离变压器（10）以及滤波后通过三相全桥整流电路（11）整流后并入直流母线。类似的，公共电网供电进入双向并网逆变器（1），通过隔离变压器（2）以及滤波后通过三相全桥整流电路（9）整流后并入直流母线（2）。反过来，直流母线上的电能分别通过三相全桥逆变电路（9）（11）逆变后通过隔离变压器（8）（10）对公共电网和负载端输电。同时通过控制直流母线电压可以实现对蓄电池组（6）的充/放电。
这样就能完成了如图1所示的能量流动,通过共轭多向逆变电源，可再生能源产生的电能（10）可以传输到蓄电池（6）储存，也可以传输到（2）对公共电网输电；蓄电池存储的电能可以传输到负载对负载供电，也可以传输到对公共电网输电；公共电网可以对蓄电池充电，也可以对负载端供电。

Claims (2)

  1. 一种共轭多向逆变电源，其特征是：双向并网整流\逆变器与双向离网整流\逆变器通过直流母线连接，控制能量在公共电网、储能系统、可再生能源发电系统和负载之间的多向流动。
  2. 根据权利要求1所述的共轭多向逆变电源，其特征是：通过控制直流母线的电压控制对储能设备的充/放电及充/放电速度。
PCT/CN2011/070672 2010-05-14 2011-01-26 共轭多向逆变电源 WO2011140841A1 (zh)

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CN102957335B (zh) * 2012-11-23 2015-03-18 广东易事特电源股份有限公司 用于并网发电系统的双向储能逆变器
CN105186562B (zh) * 2015-09-07 2018-02-16 中国农业大学 一种大规模分布式电源的微网群及其控制方法
CN106981480B (zh) * 2017-05-27 2023-10-27 富士电机（中国）有限公司 Igbt模块、动力系统和混合动力汽车

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CN101114771A (zh) * 2007-09-03 2008-01-30 清华大学 基于有源型电压源直流输电的风电并网功率稳定器
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