Direct-current continuous commutation failure suppression method utilizing regulation capability of multifunctional energy storage device

Abstract

The invention provides a direct-current continuous commutation failure suppression method utilizing the regulation capability of a multifunctional energy storage device. According to the method, four-quadrant operation of an energy storage device is realized through a space vector pulse width modulation (SVPWM) technology, and after a commutation failure fault of an AC / DC system is detected, a fourth quadrant operation mode is quickly switched to so as to output active power and reactive power, so that the dynamic reactive power demand of an inverter in the commutation failure fault recovery process is improved, and the occurrence of continuous commutation failure of the system is inhibited. According to the invention, the adjusting capacity of the multifunctional energy storage device isfully utilized, and dynamic reactive power support is provided for the system in the commutation failure recovery process of the direct current system, so that continuous commutation failure of the system is restrained, safety and stability of the alternating current and direct current system are improved, and good engineering application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric power and relates to a strategy for suppressing DC continuous commutation failure, in particular to a method for suppressing DC continuous commutation failure utilizing the adjustment capability of a multifunctional energy storage device. Background technique [0002] Thyristor-based DC transmission technology has been widely used in practical engineering due to its advantages of large capacity and long-distance transmission. A typical multi-infeed DC system has been formed in East China, South China and other load centers in China. As of the end of 2018, the East China Power Grid has fed in 11 circuits of DC. The dense connection of DC not only effectively relieves the pressure on electricity consumption, but also improves the power system. Safe and stable operation also brings new challenges, among which the failure of DC commutation is an important challenge. If the failure of DC commutation i...

AI Technical Summary

Problems solved by technology

A typical multi-infeed DC system has been formed in East China, South China and other load centers in China. As of the end of 2018, the East China Power Grid has fed in 11 circuits of DC. The dense connection of DC not only effectively relieves the pressure of power consumption, but also brings more benefits to the power system. Safe and stable operation also brings new challenges, among which the failure of DC commutation is an important challenge. If the failure of DC commutation is not handled properly, it is easy to cause subsequent DC continuous commutation failure or even DC blocking events.

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