A closing control method and system based on voltage following
A technology of voltage following and control methods, which is applied in the direction of power transmission AC network, etc., can solve the problem that the role of AC filter cannot be fully exerted, and achieve the effects of ensuring safety, prolonging service life, and improving utilization efficiency
Active Publication Date: 2022-02-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology
In this way, when the load fluctuation of the DC converter station is large, the role of the AC filter cannot be fully exerted
Method used
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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.
[0040] Such as figure 1 , figure 2 As shown, the closing control method based on voltage following provided by the present invention is used for a circuit breaker closing device, including the following steps:
[0041] 1) Record the last opening time t of the circuit breaker 0 And as the discharge start time of the capacitor, record the voltage amplitude U across the capacitor at the last opening time of the circuit breaker 0 And as the discharge start voltage of the capacitor, wherein, the discharge start time of the capacitor is the time from the last break of the circuit breaker to the successful closing of the circuit breaker again, and the voltage amplitude U a...
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The invention relates to a closing control method and system based on voltage following, which is characterized in that it includes the following contents: 1) Record the last opening moment of the circuit breaker and use it as the discharge starting time of the capacitor, and record the last opening time of the circuit breaker. The voltage amplitude across the capacitor at the gate moment is used as the discharge starting voltage of the capacitor; 2) According to the discharge starting time of the capacitor and the discharge starting voltage of the capacitor, calculate the intersection point of the capacitor voltage and the AC phase voltage; 3) Use the closing device The time when the closing command is received is used as the starting point. Taking into account the switch closing delay of the closing device, the target closing point of the circuit breaker is determined; 4) Determine the triggering time of the closing device; 5) The closing device determines the triggering time of the closing device according to the time of receiving the closing command. time, the target closing point of the circuit breaker and the triggering time of the closing device, the circuit breaker is closed and controlled to achieve isobaric closing of both ends of the circuit breaker. The invention can be widely used in the technical field of high-voltage direct current transmission.
Description
technical field [0001] The invention relates to a closing control method and system based on voltage following, and belongs to the technical field of high voltage direct current transmission. Background technique [0002] In recent years, with the rapid development of high-voltage direct current transmission, direct current transmission schemes and direct current transmission equipment are constantly updated. Among them, the AC filter is an important equipment of the direct current converter station, and its function is to be responsible for the harmonics generated by the converter in the direct current converter station. Filter out to avoid harmonics from entering the power system. At present, the circuit breaker phase selection closing device of the AC filter is mainly used to control the closing of each phase of the circuit breaker near the voltage zero crossing point when the filter is switched on, so as to reduce the closing inrush current and protect the filter circuit...
Claims
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 潘尔生乐波杜商安吴方劼申笑林王奥
Owner STATE GRID CORP OF CHINA