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Method for inhibiting simultaneous phase change failure of two layers of inverters, and controller

A commutation failure and inverter technology, which is applied in the field of power transmission and distribution, can solve the problems of commutation failure, affecting the stable operation of the system, and lack of coordinated control means for the connected inverters, so as to reduce the probability of commutation failure. Effect

Pending Publication Date: 2019-07-16
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, with the traditional control strategy on the inverter side, when an AC grid fails on the inverter side and the commutation failure of the connected inverter may cause commutation failure of another inverter connected to the normal AC grid at the same time, affecting the system The stable operation of the two-tier AC system lacks corresponding coordination and control means between the inverters connected

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  • Method for inhibiting simultaneous phase change failure of two layers of inverters, and controller
  • Method for inhibiting simultaneous phase change failure of two layers of inverters, and controller
  • Method for inhibiting simultaneous phase change failure of two layers of inverters, and controller

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The present invention provides a method for suppressing simultaneous phase commutation failure of two-layer inverters. The control method is suitable for high-voltage direct current transmission systems where the inverter side is connected in layers, such as figure 1 As shown, the DC sending end of the HVDC transmission system is connected to the AC system of the same voltage level, the DC receiving end is respectively connected to the AC systems of two voltage levels, and the two-layer inverters are in the same converter station. The rectifier side of the HVDC transmission system adopts constant active power control or constant DC current control, and the inverter side adopts constant turn-off angle control or constant DC voltage control.

[0034] Such as figure 2 As shown, the method includes the following steps:

[...

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Abstract

The invention discloses a method for inhibiting simultaneous phase change failure of two layers of inverters, and a controller; the method comprises the following steps of acquiring a difference valuebetween a turn-off angle preset value and a turn-off angle operation value of a first-layer inverter; obtaining a turn-off angle additional value according to the difference value; and under a condition that a compensation condition is met, enabling the turn-off angle additional value to be compensated to a second-layer inverter. According to the technical scheme provided by the invention, the turn-off angle operation value of the other layer of inverter can be dynamically compensated according to the situation of the turn-off angle of the inverter which suffers from phase change failure caused by fault of a connected alternating current system, so that the possibility that the two-layer inverters connected with the alternating-current system in a direct-current power transmission systemare subjected to phase change failure simultaneously is lowered.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method and a controller for suppressing simultaneous commutation failures of two-layer inverters. Background technique [0002] With the wide application of UHV DC technology in my country, the concentration of multi-infeed DC into the load center of the receiving end will be an important issue facing the development of my country's power grid in the future. The UHV DC adopts the current source valve group. When commutating, the AC power grid at the receiving end needs to provide sufficient commutation voltage, and a large amount of reactive power needs to be absorbed during the power recovery process after commutation failure, and more feed into the DC It will bring serious safety and stability problems to the AC power grid at the receiving end. The main problem of multi-infeed DC is whether the receiving end grid can provide strong voltage support...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 黄勇王庆郭春义杨鹏程赵成勇杨硕
Owner STATE GRID CORP OF CHINA
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