Virtual synchronous control system of flexible switching device of power distribution network

Abstract

The invention provides a virtual synchronous control system of a flexible switching device of a power distribution network. The system comprises a data acquisition detection module, a transformation calculation module, a virtual synchronous control module, a current loop control transformation module and a pulse width modulation module, wherein the data acquisition and detection module acquires three-phase voltage and current values and detects phase angles, the transformation calculation module performs coordinate transformation on the three-phase voltage and current values and calculates active power and reactive power, and the virtual synchronous control module receives data information transmitted by the transformation calculation module and outputs a current instruction value; the current loop control transformation module converts the current instruction value, calculates and outputs a fundamental wave voltage instruction value of the converter at the receiving end of the flexible switch, and performs coordinate transformation on the fundamental wave voltage instruction value; and the pulse width modulation module receives the transformed fundamental wave voltage instructionvalue, generates a flexible switch modulation signal through space vector synthesis, improves the power distribution performance, and maintains the safe and stable operation of a power distribution system.

Description

technical field [0001] The present invention relates to the technical field of distribution network flexible switchgear control, and more specifically, to a virtual synchronous control system for distribution network flexible switchgear. Background technique [0002] With the further development of power electronic devices and control technology, it is possible to apply voltage source converters based on fully-controlled devices to power transmission, and with the use of fully-controlled power electronic devices, the development of power electronics in power systems The characteristics are becoming more and more obvious. [0003] The PQ control mode is generally adopted in the commutation process of the converter, that is, the active and reactive power is output according to the set value. , reactive power command and grid voltage and current command, and then control the active and reactive power output of the system, but this control method lacks voltage regulation and ca...

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Problems solved by technology

[0006] In order to overcome the shortcomings of the lack of inertia and damping characteristics of the dual-loop control mode in the traditional converter process, resulting in poor dynamic characteristics of the output frequency and adverse effects on the stable operation of the power distribution and transmission system, the present invention A virtual synchronous control system for flexible switching devices in distribution networks is proposed to improve distribution performance and maintain safe and stable operation of distribution systems

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