Multi-source microgrid frequency coordination method based on adaptive robust control

Abstract

The invention relates to a multi-source microgrid frequency coordination method based on adaptive robust control. The method comprises the following steps: (1) constructing a multi-source microgrid system containing a plurality of groups of photovoltaic systems, a diesel engine system, an energy storage system and various types of loads; (2) setting the frequency modulation power of the photovoltaic systems to obtain the adjustable frequency deviation ranges of the photovoltaic systems, and setting a frequency deviation threshold value according to the adjustable frequency deviation ranges; (3) proposing a frequency coordination strategy so that coordinated operation is carried out on the photovoltaic systems and the energy storage system according to the frequency deviation threshold value, and participating once frequency adjustment of the multi-source microgrid system; (4) constructing a sliding mode load frequency controller based on the diesel engine system; and (5) taking the output command of the sliding mode load frequency controller as the compensation dosage of twice frequency adjustment of the diesel engine system, and completing frequency coordination in combination with the proposed frequency coordination strategy. Compared with the prior art, the multi-source microgrid frequency coordination method has the advantages of actively participating frequency adjustment,being high in robustness, reducing frequent action and power configurations of the energy storage system and the like.

Description

technical field [0001] The invention relates to a frequency coordination method, in particular to a multi-source microgrid frequency coordination method based on adaptive robust control. Background technique [0002] As a supplementary part of the large power grid, the microgrid has broad application prospects for solving the problem of regional power supply in islands, remote areas and cities. At the same time, the microgrid can maximize the use of renewable energy and minimize the use of diesel engines for power generation. Resource conservation makes an important contribution. The independent operation of the microgrid is its main operation mode. In this mode, the microgrid needs to maintain its own voltage and frequency quality. The output power of the renewable energy power generation system changes with the natural environment such as light intensity and temperature, which is random and intermittent, and the system load power also changes with time. These factors will...

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Problems solved by technology

This measure is only an improvement on the primary and secondary frequency regulation of traditional generating units, without considering the coordination of renewable energy and energy storage systems to participate in system frequency regulation

In addition, the existing technology proposes to use the capacity of the energy storage system to compensate for the slow response of wind turbines and improve the system frequency stability, but it does not consider the uncertainty of system parameters and the random fluctuation of loads.

[0004] The traditional generator set is a typical nonlinear system, and there are uncertainties in the system parameters. At the same time, the microgrid containing photovoltaic units not only has fluctuations and intermittents in the output power of the photovoltaic system, but also has randomness in the load of the microgrid.

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