Starting method of high voltage direct current transmission system

Abstract

The invention discloses a starting method of a high-voltage direct current transmission system. If the communication between stations fails and a frequency control function operates, a current instruction at a rectifier side is set to be 1.0pu, and meanwhile, the voltage reference value compensation of a constant voltage controller at the rectifier side is cancelled, the voltage reference value compensation is added at an inverter side, and voltage reference values at two sides are set; the inverter side is unlocked, and the inverter side is forced to work in a constant extinction angle control mode; the rectifier side is manually unlocked, a shift phase command is released after the rectifier side is unlocked, and the constant voltage controller at the rectifier side operates when the output of a constant current controller at the rectifier side drops to be equal to the output of the constant voltage controller; the direct current voltage at the inverter side is detected, and the current margin is compensated; and the inverter side enters a constant current control mode, the current is controlled at the minimum operating current, and then the starting process is finished. Through the starting method, the controllers at the two sides can be coordinated to work under the condition that the communication between stations fails, and the constant voltage control at the rectifier side and the constant current / power control at the inverter side after starting are realized.

Description

technical field [0001] The invention belongs to the fields of high-voltage direct current transmission and ultra-high voltage direct current transmission, and in particular relates to a starting method of a high-voltage direct current transmission system. Background technique [0002] The HVDC power transmission system includes a rectifier station and an inverter station. Starting means that the inverter side and the rectifier side of the same pole are unlocked respectively, and the power flow between the two stations is established. In the process of starting and stopping the pole, the unlocking and locking status of the two stations are communicated to each other through the communication channel between the stations, so that the sequence of unlocking and locking of the two stations is guaranteed in these processes. When the inter-station communication fails, the personnel of the two stations contact by telephone to coordinate the unlocking and locking sequence of the two ...

AI Technical Summary

Problems solved by technology

When the inter-station communication fails, the frequency measurement value on the inverter side cannot be sent to the rectifier side. If the DC voltage frequency modulation on the inverter side is adjusted, on the one hand, the reduction of the DC voltage will increase the loss of reactive power. On the other hand, , the DC voltage adjustment range is limited, resulting in limited frequency modulation capability

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