Method for designing frequency controller of independent micro-grid

Abstract

The invention relates to a method for designing a frequency controller of an independent micro-grid. The method comprises the following steps of: establishing a mathematical model of a power generation system of the independent micro-grid, wherein the independent micro-grid comprises a photovoltaic power generation system and a diesel engine system hybrid power supply system; establishing a photovoltaic system mathematical model; establishing a diesel engine mathematical model comprising load disturbance; and designing an interference observer and a sliding mode controller. The output power of a diesel engine generator is regulated to reduce micro-grid frequency deviation caused by a load change and the power fluctuation of a photovoltaic system. By a designed sliding mode load frequency compensation controller, the micro-grid frequency deviation can be reduced, the maximal power output of the photovoltaic system is ensured, and the utilization rates of renewable energy sources are increased.

Description

technical field [0001] The invention relates to a power system frequency control technology, in particular to a design method for an independent micro-grid frequency controller based on a disturbance observer and sliding mode control. Background technique [0002] Island operation is an important operation mode of microgrid, and it is an important way to solve the problem of electricity consumption in remote areas of our country, local electricity consumption during large power grid disasters, and military electricity consumption under war conditions. But in standalone mode, the microgrid must be able to maintain its own voltage and frequency. When new energy sources such as photovoltaics are connected to the microgrid, the output power of the photovoltaic power generation system has the characteristics of volatility, randomness, and intermittence due to the influence of weather changes, so the fluctuation of power output and the continuous change of load in the microgrid I...

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Problems solved by technology

[0004] The invention aims at the problem that the independent micro-grid system with photovoltaic power generation system and diesel generator as the power supply is greatly affected by the fluctuation of photovoltaic output power and difficult to control, and proposes a design method for the frequency controller of the independent micro-grid, and designs an interference observer And sliding mode controller, by adjusting the output power of the diesel generator, reduce the microgrid frequency deviation caused by load changes and photovoltaic system power fluctuations

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