Voltage source-type energy storage micro grid power quality improvement predictive control method

A voltage source type, predictive control technology, applied in AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve problems such as harmonic pollution and small capacity of microgrid

Active Publication Date: 2016-08-03
WUHAN UNIV
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Problems solved by technology

However, the small capacity of the microgrid and the large number of power electronic devices use...

Method used

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  • Voltage source-type energy storage micro grid power quality improvement predictive control method
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  • Voltage source-type energy storage micro grid power quality improvement predictive control method

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Embodiment

[0056] Embodiment: The theoretical basis and methods involved in the present invention will be introduced in turn below.

[0057] 1. The feasibility of using VESS for harmonic compensation.

[0058] figure 1 The schematic diagram of the structure of the VESS system is shown. The VESS is mainly composed of energy storage elements, DC / DC converters and voltage source converters (Voltages-source-converter, VSC) and other equipment. Among them, the energy storage element is connected in parallel with the DC side of the VSC through a DC / DC converter, and is interfaced with the power system through the VSC. On the one hand, VSC is based on the constant voltage V on the DC side DC , the output voltage waveform of its AC side can be adjusted through switch control to indirectly control its output current i VESSm (m=a, b, c) waveform, so as to realize the four-quadrant power regulation of VESS; on the other hand, the DC / DC converter of the energy storage unit adjusts i ESS magnitud...

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Abstract

The invention relates to a voltage source-type energy storage micro grid power quality improvement predictive control method. The energy storage system serves as an important part of the micro grid, and research on multiple usages of the energy storage system in the micro grid plays an important role in improving the utilization efficiency. On the basis of analyzing the feasibility of using voltage source-type energy storage to realize harmonic current compensation, a multiple predictive control method of improving micro grid voltage and frequency dynamic stability and compensating the harmonic current by the energy storage system is researched. Firstly, based on an ip-iq detection method for the harmonic current and an instantaneous power theory and in combination with a GM (1,1) gray model, a comprehensive instruction current compensation predictive method for multifunctional control of the energy storage device is researched and realized; then, based on a dynamic model for voltage source-type converter output current, through building an optimal switch selection function for the converter, a predictive control strategy for tracking the comprehensive instruction current based on the optimal switch mode is provided for an energy storage system grid-connected converter; and finally, effectiveness of the provided switch control strategy is verified.

Description

technical field [0001] The invention relates to a predictive control method, in particular to a predictive control method for voltage source type energy storage to improve the power quality of a microgrid. Background technique [0002] The microgrid composed of distributed power sources, energy storage systems and loads has the characteristics of flexible power supply and full use of various renewable clean energy. It can not only provide electric energy to users, but also provide timely support for large power grids. At the same time, it can effectively improve the operating economy of the power system. However, the small capacity of the microgrid and the large number of power electronic devices used in the network also cause harmonic pollution to these devices and nonlinear loads in the network. Therefore, improving the power quality of the microgrid has also become an aspect of its operation technology development. [0003] Considering that the switching frequency fluct...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/16
CPCH02J3/01H02J3/16H02J2203/20Y02E40/30Y02E40/40
Inventor 彭晓涛周歧林张彬谷志华徐云
Owner WUHAN UNIV
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