Voltage Stability Control Method for Microgrid System Based on Robust Control

Abstract

The invention discloses a micro-grid system voltage stability control method based on robust control. The control structure of an intelligent micro-grid system is composed of a system control layer, a concentrated control layer and a local control layer, and energy optimization and voltage and frequency stability control of the micro-grid system are realized through multi-layer coordination control. According to the micro-grid system voltage stability control method based on robust control, a comprehensive load module of an induction motor is established, wherein dynamic loads are connected with static loads in parallel. On the premise that the constraint conditions of system performance and robust stability are met, a micro-grid voltage stability robust controller is designed by the adoption of a method of solving the problem of mixed sensitivity so as to improve the micro-grid voltage stability. The micro-grid system voltage stability control method based on robust control can be adapted to wide-range change of load parameters, has high robustness for the situations that due to the factors such as changes of running conditions, influences of external environment and frequency switching of the loads, perturbation is generated in model parameters of a micro-grid and uncertainty exists in the topologic part and the unmolded part and can better restrain parameter drift and noise interference, and meanwhile, the controller is simple in structure and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of micro-grids in smart grids, in particular to a robust control-based micro-grid system voltage stability control method. Background technique [0002] Microgrid refers to a system close to the user end composed of distributed power sources (capacity less than 50MW), including solar energy, wind energy, water energy, biomass energy, gas turbines and energy storage devices in a certain area, which can be connected to the large power grid. , and can also be disconnected from the main network and run independently. Solve the main problems in the grid-connected operation of a large number of distributed power sources in various forms at the medium and low voltage level. Therefore, the micro-grid coordinates the contradiction between the large power grid and distributed power, fully taps the advantages of distributed power to disperse power demand and resource distribution, and has good compatibility with the e...

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Problems solved by technology

However, the application does not establish a static load model and a dynamic load model to design a frequency control strategy based on the actual load characteristics inside the microgrid, and the frequency control effect cannot sufficiently reflect the reality. mention

[0010] According to the search, there are no relevant technical achievements in the smart microgrid voltage stability control method for static load modeling and dynamic load modeling. In the application of robust control theory to the voltage of smart microgrids with various renewable energy sources including wind, diesel and storage In terms of stability control, there is no relevant report, which is blank

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