Hybrid energy storage frequency modulation control method for microgrid
A control method and hybrid energy storage technology, applied in the arrangement of multiple synchronous batteries, collectors, electric vehicles, etc., can solve the problems of not considering the characteristics of energy storage equipment and the state of charge of energy storage equipment, and achieve Extend service life and ensure stable operation
Active Publication Date: 2020-07-24
TAIYUAN UNIV OF TECH
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However, traditional energy storage frequency modulation also has limitations. It does not take into account the characteristics of different types of energy storage devices, or does not consider factors such as the SOC (state of charge) of energy storage devices.
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[0029] First, the microgrid system structure of the present invention is simplified as figure 1 shown. The microgrid system includes a hybrid energy storage device and load composed of a super capacitor and two batteries. The voltage between the energy storage device and the load is first boosted by DC / DC, and then connected by DC / AC inverter. The supercapacitor is a power-type energy storage device, which can provide power quickly, but cannot output energy for a long time, while the battery is an energy-type energy storage device, which can output energy for a long time, but the response speed is slow. The combination of the two can just complement each other .
[0030] A hybrid energy storage frequency modulation control method for microgrids. Supercapacitors are used as the main frequency control unit to respond to system frequency changes, and two batteries respond to load power changes and participate in secondary frequency modulation of the system. The traditional form...
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The invention discloses a hybrid energy storage frequency modulation control method for a microgrid. The method is based on traditional droop control. A hybrid energy storage device selects storage batteries and a super capacitor with strong complementarity; the super capacitor is used as a main frequency control unit to quickly provide power response frequency change; the storage batteries respond to the power change of the load and participates in secondary adjustment of the frequency; in addition, different from traditional droop control frequency modulation, the method realizes SOC controlof the energy storage device; when the super capacitor is used as an energy storage device with high power density and low energy density to respond to the rapid power change of the load, the SOC ofthe super capacitor is basically unchanged near a set point, and the SOC of the storage batteries is gradually balanced while the multiple storage batteries respond to the power change of the load.
Description
technical field [0001] The invention relates to the technical field of frequency modulation of a microgrid system, in particular to a hybrid energy storage frequency modulation control method for a microgrid. Background technique [0002] The massive consumption of traditional fossil energy has led to its continuous depletion, and the development and utilization of renewable energy has been paid more and more attention by various countries. The stability of renewable energy power generation is poor, while microgrid is more flexible and efficient than large power grid. Using microgrid to control renewable energy power generation can effectively enhance the stability of renewable energy power generation. Energy trends and effective ways. [0003] A key factor for the stability of the microgrid is whether its frequency is stable. Generally speaking, renewable energy power generation has strong randomness, intermittency, and volatility, which will cause system frequency fluctua...
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IPC IPC(8): H02J3/24H02J3/32H02J7/00
CPCH02J3/24H02J3/32H02J7/0016
Inventor 李岚郭潇潇程之隆吴雷
Owner TAIYUAN UNIV OF TECH