Composite robust control-based single- and three-phase hybrid multi-microgrid voltage control method

Abstract

The invention relates to a composite robust control-based single- and three-phase hybrid multi-microgrid voltage control method. The method involves two parts of a robust controller and a quasi-proportion resonant (QPR) controller. The structure of the robust controller is implemented according to the design of a sensitivity index, building of state space equation and optimization problem of a generalized controlled object. A difference value between a power grid voltage and a reference voltage is used as a system input signal by the robust controller and the QPR controller, and the control ofthe output voltage is achieved by weighted control of a system error, control output and system robustness. By the method, relatively high robustness is shown when the power supply output power fluctuation and load abrupt change are handled.

Description

technical field [0001] The invention belongs to the technical field of microgrid control, and in particular relates to a single-three-phase mixed multi-microgrid voltage control method based on composite robust control. Background technique [0002] Microgrid is one of the most effective ways to utilize distributed energy. It organically combines distributed energy with all power generation and distribution equipment and secondary equipment to form a small power generation and consumption system that can operate independently. The increasing number of microgrids has promoted the interconnection between microgrids, and multiple microgrids in a certain area are interconnected to form a multi-microgrid system. The voltage stability control of the multi-microgrid is the key to maintaining the stable operation of the entire multi-microgrid and the normal operation of each electrical equipment. In-depth research on the voltage control method of the multi-microgrid is of great sign...

AI Technical Summary

Problems solved by technology

The above control methods all adopt the secondary control method, but the secondary control is too dependent on communication, and the reliability of the control will be affected to a certain extent when the communication channel is damaged or congested

And the above voltage control still adopts traditional PI control, which has poor anti-interference ability when dealing with large disturbances such as micro power output power fluctuations and load mutations.

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