Control method for inhibiting continuous commutation failure of high-voltage DC power transmission based on harmonic detection

Abstract

The invention discloses a control method for inhibiting a continuous commutation failure of high-voltage DC power transmission based on harmonic detection, and belongs to the technical field of thermo-optic and electro-optic. The method comprises the steps: deducing control parameters of each harmonic control loop by a time area analysis method, and adding the control parameters into low-voltage current-limiting control of an original control system; when the high-voltage direct-current system has a commutation failure, detecting the voltage of the commutation bus, performing Fourier decomposition, and performing the inhibition of each harmonic component through a newly added harmonic control system, thereby achieving the purpose of inhibiting the subsequent commutation failure. Accordingto the invention, no primary equipment is added, and only a control system is improved, so the system transformation workload is low, namely, the cost is low; when a harmonic voltage of the system isdetected, the control method provided by the invention improves the performance of low-voltage current-limiting control (VDCOL) by reducing the influence of the harmonic component, achieves the effectof inhibiting the continuous commutation failure, reduces the risk of DC locking, and improves the safety and stability of system operation.

Description

technical field [0001] The invention belongs to the technical fields of thermo-optic and electro-optic, and in particular relates to a control method for suppressing continuous commutation failure of high-voltage direct current transmission based on harmonic detection. Background technique [0002] High Voltage Direct Current transmission (HVDC) has become an important means to solve large-capacity, long-distance power transmission and asynchronous interconnection of power grids in the world's power countries. [0003] Commutation failure is one of the most common faults in HVDC, and its existence poses a great threat to the safe and stable operation of the power grid. When the commutation fails in the system, it will cause the DC voltage to drop and the DC current to rise rapidly, which will have an impact on the converter valve, and may cause subsequent commutation failures. In severe cases, it will cause DC blocking and equipment damage. After the AC system fails, the fi...

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Problems solved by technology

[0005] The above studies have achieved certain results in suppressing the failure of continuous commutation, but the harmonics generated after the failure of commutation are also the cause of the failure of continuous commutation, which is not analyzed in the above research content

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