Control method of grid friendly type distributed power source based on hybrid energy storage

A distributed power supply and hybrid energy storage technology, which is applied in energy storage, AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problems that the energy storage device cannot be fully utilized, and the flexible management of the battery pack cannot be realized.

Active Publication Date: 2013-03-20
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

In order to obtain a stable DC bus voltage, some literature proposes a hybrid energy storage structure in which a supercapacitor is connected in parallel with a battery pack through a DC/DC converter. Although the DC bus voltage is

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  • Control method of grid friendly type distributed power source based on hybrid energy storage
  • Control method of grid friendly type distributed power source based on hybrid energy storage
  • Control method of grid friendly type distributed power source based on hybrid energy storage

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Embodiment Construction

[0105] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0106] Such as figure 1 , providing a control method of a grid-friendly distributed power supply based on hybrid energy storage, the method comprising the following steps:

[0107] Step 1: Optimizing the topology of the distributed power supply;

[0108] Step 2: coordinately control the DC power supply system through the DC / DC converter control mode normalization model;

[0109] Step 3: Grid adaptive control of the DC / AC converter on the AC side.

[0110] Such as figure 2 , in the distributed power topology, the intermittent renewable energy power generation system, the lithium battery energy storage system and the supercapacitor energy storage system pass through DC / DC converter A, DC / DC converter B and DC / DC converter C respectively It is connected in parallel with the DC bus to form a DC power supply system of distributed power supply. The DC power su...

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Abstract

The invention provides a control method of a grid friendly type distributed power source based on hybrid energy storage. The method comprises the steps of optimally designing a topology structure of the distributed power source, controlling a direct current power supply system in a coordinating mode through a direct current (DC)/DC converter controlling a model normalization model, and self-adaptively controlling a grid of an alternating current (AC) side DC /AC converter. The distributed power source not only can be connected in a large grid to operate so as to reduce the influence of intermittent renewable energy power generation grid connection on the grid and provide support of voltage and frequency for the grid, but also can be connected into a micro-grid to operate as a network unit of the off-network type micro-grid to maintain stability of voltage and frequency of the off-network type micro-grid. When an outer grid breaks down, the distributed power source can realize switch between a grid mode and an island mode so as to improve power supply reliability of important loads in the system. The distributed power source improves technical performance and economic performance of the whole system through matching utilization of an energy type system and a power type energy storage system.

Description

technical field [0001] The invention relates to the operation and control of distributed power sources, in particular to a control method for grid-friendly distributed power sources based on hybrid energy storage. Background technique [0002] To realize the grid-friendly characteristics of distributed power generation based on hybrid energy storage, the control strategy of the AC side converter of distributed power generation and the effective utilization of hybrid energy storage are key technical issues that need to be solved. [0003] (1) Distributed power supply control strategy [0004] Intermittent renewable energy power generation, especially wind power and photovoltaic power generation, has the characteristics of intermittent, fluctuating and uncontrollable output. If it is connected to the grid, it will have a series of impacts on the security and stability of the grid. In order to reduce the impact of renewable energy generation grid connection on the grid, the re...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCY02E70/30
Inventor 鲍薇李光辉何国庆孙艳霞赵伟然冯凯辉
Owner CHINA ELECTRIC POWER RES INST
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