Island microgrid voltage control method and controller

Abstract

The invention discloses an island microgrid voltage control method and a controller. The island microgrid voltage control method comprises the following steps: mathematical models of a single-phase island microgrid control mechanism and a three-phase island microgrid control mechanism are respectively established; and the mathematical models serve as a system model, an introduced reference model serves as expected output, the deviation between the output of the system model and the output of the reference model is fed back to a self-adaptive PID controller, a self-adaptive mechanism sends an adjusting signal to the PID controller according to the control law, control parameters are adjusted online, and the actual system control output is made to be consistent with the expected output. According to the method, the model reference adaptive PID controller is adopted, the introduced reference model is used as the expected output, the system continuously adjusts parameters through the adaptive law in operation to achieve the effect consistent with the expected output, in addition, based on the MIT law, the performance indexes are continuously optimized to reach the minimum value, and the stability and the anti-interference performance of the system are ensured.

Description

technical field [0001] The invention belongs to the technical field of power grid control, and in particular relates to a voltage control method and a controller of an isolated island micro-grid. Background technique [0002] Microgrid technology has outstanding advantages such as providing convenience for the access and consumption of distributed power sources, effectively solving the power supply problems in remote areas or islands, and has achieved considerable development since it was proposed. However, when the microgrid operates in an isolated island, especially the rapid development of new energy such as wind and solar power generation and new loads such as electric vehicles, the uncertainty of the operation of the microgrid system is significantly enhanced. At the same time, parameter changes, detection errors and other influencing factors in the system are inevitable, and it is usually difficult to establish an accurate model of the control object. These unmodeled d...

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Problems solved by technology

However, conventional PID control is difficult to solve system problems such as the complex mathematical model of the controlled object, large-scale mutation of the operating point, and time-varying uncertainty.

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