Alternating current side wiring structure of direct current transmission system of power supply converter and control method thereof

Abstract

The invention relates to an alternating current side wiring structure of a direct current transmission system of a power supply converter and a control method of the alternating current side wiring structure. The wiring structure comprises an upper stage circuit breaker CB1, an access circuit breaker CB2, a transformer T, a start resistor R and an alternating current circuit breaker CB3, wherein an alternating current incoming line of a converter station is led to a power supply from the upper stage circuit breaker CB1, the upper stage circuit breaker CB1 is connected with the transformer T through the access circuit breaker CB2, the start resistor R and the alternating current circuit breaker CB3 constitute a parallel circuit, and the transformer T is connected with the converter C through the parallel circuit constituted by the start resistor R and the alternating current circuit breaker CB3. When the direct current side of the converter breaks down, control protection is performed to simultaneously send commands for skipping the alternating current incoming line circuit breaker and the circuit breaker connected with the start resistor in parallel. Under the condition that the alternating current incoming line circuit breaker fails, the start resistor is connected into the fault circuit, and thus a fault current flowing through the converter before the skipping of the upper stage circuit breaker is effectively reduced, safety of a converter valve is protected and design parameters of original components of equipment are reduced.

Description

technical field [0001] The invention relates to an AC side wiring structure of a power converter direct current transmission system and a control method thereof, in particular to a power converter direct current transmission system AC side wiring structure and a control method for limiting the short circuit fault current of the DC side. Background technique [0002] For the sake of sustainable development, using renewable energy such as solar energy and wind energy to generate electricity has become the development direction of the future power system. These power generation methods have the characteristics of being far away from the main grid and fluctuating greatly over time. The voltage source converter HVDC (VSC-HVDC) based on the voltage source converter can independently and quickly control the transmitted active power and reactive power. Active power and reactive power, with superior controllability and flexibility, have become the most potential power transmission m...

AI Technical Summary

Problems solved by technology

In order to ensure the safety of the equipment, the parameters of the equipment, especially the margin of the anti-parallel diode and the bypass thyristor, must be considered according to the short-circuit current of 300-400ms, which greatly increases the investment of the equipment.

Images