Adaptive pinning control method for isolated microgrid voltage and frequency

Abstract

The invention provides an adaptive pinning control method for isolated microgrid voltage and frequency, and constructs an isolated microgrid system with multiple distributed generators. A general droop equation is used to construct renewal equations of voltage and frequency in the isolated microgrid. A pinning control method is used to provide reference values for some distributed generators in the microgrid. By using the adaptive control method, estimated values of each distributed voltage and frequency and an estimated formula of line impedance are constructed, and accurate voltage and frequency outputs are obtained. The invention effectively designs and combines the adaptive control method with the pinning control method; the operation of the system can be efficiently controlled when the system has a plurality of distributed generators; accurate voltage and frequency outputs can be provided without parameter adjustment when the system works in circuits with different line impedances; thereby reliable and accurate voltage and frequency outputs are provided for power supply of external systems.

Description

technical field [0001] The invention relates to an adaptive containment control method, in particular to an adaptive containment control method for the voltage and frequency of an isolated island microgrid, and belongs to the field of adaptive control and microgrid systems. Background technique [0002] The voltage and frequency regulation of the microgrid plays an important role in both grid-connected and islanded modes. The classical droop equation is derived from the power system theory of the AC grid. In an inductive network, the frequency depends on the active power and the voltage depends on the reactive power. The limitations of the classical droop equation are the limitation of short transients, low power sharing accuracy and limitation of output voltage deviation. At the same time, in medium-voltage or low-voltage microgrids, since the resistance and inductance components between lines cannot be ignored, the classic droop equation cannot fully reflect the line par...

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Problems solved by technology

However, this method is capable of constructing a system error model. It is based on the assumption that the resistance component of the line impedance in the system is much larger than the inductance component. However, in an actual circuit, the line impedance may be resistive, neutral or inductive. The method of controlling the system with wrongly constructed error model is not universal and adaptive

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