Mathematical model and internal model controller of vsc inverter station for supplying power to passive network

Abstract

The invention relates to a global small-signal mathematic model and an internal model controller for a VSC converter station for supplying power for a passive network. The global small-signal mathematic model comprises three parts such as a VSC converter small-signal mathematic model, a coupling electric reactor and converter transformer equivalent small-signal model and a passive network small-signal model. Then, control system dynamic performance index ISE and robust performance index M value function are comprehensively considered, and appropriate low-pass filter bandwidth is selected. Finally, according to an internal model principle, the structure and parameters of the internal model controller for the VSC converter station are deduced, and controlled volumes are common node voltage dand q axis components on the alternating current side of the VSC converter station. Above all, the designed internal model controller for the VSC converter station can realize alternating current voltage control, stable alternating current voltage and good quality of electric energy can be provided for the passive network under the working conditions such as load fluctuation, controlled volume set value change and parameter perturbation.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering. In particular, it relates to a design method for an internal model controller of a VSC (voltage source converter based on a fully-controlled power electronic device) inverter station that supplies power to a passive network. Background technique [0002] VSC active power and reactive power are independently controllable, its current can be self-shutoff, no external commutation voltage is required, and the power quality is good. Therefore, VSC is widely used in high-voltage direct current transmission systems such as flexible direct current transmission systems, hybrid direct current transmission systems, and multi-terminal direct current transmission systems. Passive network power supply such as industrial centers. However, system power flow changes, load fluctuations, short-term faults, etc. make the external disturbance of the VSC inverter station frequent, and the simplifi...

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Problems solved by technology

However, system power flow changes, load fluctuations, short-term faults, etc. make the external disturbance of the VSC inverter station frequent, and the simplification of the mathematical modeling of the VSC converter makes the model have certain errors. In addition, the parameters of components change with time and environment, It also makes the model mismatch, and puts forward higher requirements for the closed-loop dynamic performance and robust stability of the VSC converter station control system

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