Control method of hybrid energy storage in wind-solar complementary microgrid

A wind-solar complementary and hybrid energy storage technology, which is applied in the energy industry, sustainable manufacturing/processing, AC network load balancing, etc., can solve the problem that the energy storage device cannot meet the power and energy at the same time, so as to reduce the number of charging and discharging cycles, Effects of improving stability and flexibility and improving reliability

Inactive Publication Date: 2017-06-20
姚秋丽
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Problems solved by technology

It can be seen that a single energy storage device cannot meet both power and energy requirements

Method used

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  • Control method of hybrid energy storage in wind-solar complementary microgrid
  • Control method of hybrid energy storage in wind-solar complementary microgrid
  • Control method of hybrid energy storage in wind-solar complementary microgrid

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Embodiment Construction

[0015] figure 1 Among them, the components are: asynchronous wind power generation unit (mainly composed of wind turbine, transmission, asynchronous generator and pitch control system), photovoltaic unit (mainly composed of photovoltaic array, BOOST circuit, LC filter and its control system) , energy storage unit (hybrid energy storage system composed of supercapacitor and battery) and load. At the same time, the microgrid is connected to the distribution network through a static switch at the common connection point.

[0016] figure 2 The medium and medium hybrid energy storage systems adopt a bipolar converter structure. The bipolar converter circuit is composed of a front-stage DC / DC converter and a rear-stage DC / AC converter. Among them, the DC / DC converter allows the bidirectional flow of energy, controlled by PWM, works in the step-down mode when charging, and works in the boost mode when discharging; the DC / AC converter is a three-phase power supply type bidirectiona...

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Abstract

A control method of hybrid energy storage in a wind-solar complementary microgrid comprises three parts: energy storage unit VSC control, storage battery energy storage unit control and super capacitor energy storage unit control. The application of a hybrid energy storage unit which combines the advantages of battery energy storage technology and super capacitor energy storage technology in the microgrid can improve the reliability of the microgrid, alleviates the imbalance of the power supply and demand, and improves the electrical energy quality and system stability and flexibility. The super capacitor shares the electric quantity of a frequently fluctuating part, reduces the number of charge-discharge cycles of the storage battery, and prolongs the service life of the storage battery so as to enhance system economical efficiency.

Description

technical field [0001] The invention relates to a wind-solar complementary microgrid, in particular to a control method for hybrid energy storage in the wind-solar complementary microgrid. Background technique [0002] With the increasing scarcity of traditional energy and the increasingly serious environmental pollution, green new energy has received more and more attention. Wind energy and solar energy, as two commonly used green new energy sources, have the characteristics of sufficient energy, wide distribution, environmental protection and cleanliness. In order to make up for the shortcomings of the two energy sources in terms of seasons and climates, the wind and solar hybrid system is used to combine the two natural complementarities and the matching of time and space, which improves the stability and practicability of the system and improves the energy efficiency. For the utilization of new energy. As an advanced structural form of distributed energy such as wind e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38
CPCY02P80/14
Inventor 姚秋丽
Owner 姚秋丽
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