VSC black start device and black start method based on phase-locked loop synchronous control

Abstract

The invention discloses a VSC (Voltage Source Converter) black start device and a black start method based on phase locked loop synchronization control. A solution to frequency establishment and voltage establishment under the condition that a VSC is not integrated into a power grid is provided, and thus, the voltage and frequency of equipment can be independently controlled. Step-by-step start isemployed in the method. Firstly, before start, charging of the direct side of a converter is completed, and the DC voltage is stabilized at the rated value; secondly, a corresponding switch in a control loop is turned off to wait for a black start signal; thirdly, after a black start signal is received, the start process begins, and the frequency and the voltage of equipment are established stepby step according to the signal; and fourthly, after the voltage and the frequency are stabilized, the switch is switched to the original control branch of the equipment according to the black start signal to realize closed-loop control, thus completing the start process. The class synchronization function of a converter based on phase locked synchronization under an isolated power grid is achieved. A feasible and effective solution is provided for the quick self-start of equipment using a VSC as a power grid interface after blackout.

Description

technical field [0001] The invention belongs to the technical field of renewable energy power generation and high-voltage direct current transmission, and more specifically relates to a VSC black start device and a black start method based on phase-locked loop synchronous control. Background technique [0002] With the increasingly serious problem of global resource shortage, new energy has become a key industry in the world because of its clean, safe, efficient, and renewable advantages. It has become a global trend to accelerate the development of new energy and promote clean and low-carbon energy transformation. Wind energy and solar energy resources are sufficient, and have become the key industries in new energy development, providing strong support for human society to get rid of dependence on fossil energy and establish an energy supply system with clean energy as the main body. By the end of 2016, the installed capacity of wind power and solar power in China was 150...

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a VSC black start device and black start method based on phase-locked loop synchronous control, thereby solving the problem that the existing control strategy based on VSC cannot realize off-network self-start and independent running technical issues

Images