High-voltage direct-current circuit breaker simulation method
A simulation method, a high-voltage DC technology, applied in instruments, special data processing applications, electrical digital data processing, etc., can solve problems such as low accuracy, and achieve the effect of simple equivalent circuit and improved accuracy
Active Publication Date: 2019-11-08
XJ ELECTRIC +3
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Problems solved by technology
[0006]The purpose of the present invention is to provide a high-voltage DC circuit breaker simulation method to solve the problem of low accuracy of the existing simulation methods
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Embodiment Construction
[0037] Embodiment of simulation method for high-voltage direct current circuit breaker:
[0038] The main ideas of the high-voltage DC circuit breaker simulation method proposed in this embodiment are:
[0039] Firstly, the power modules in the transfer branch are discretized in the electromagnetic transient simulation environment based on the backward Euler method, and the accompanying circuits of the power modules are obtained. In the power module, according to the on-off state of the semiconductor switch (including a controllable switch and a diode, the controllable switch in this embodiment is an IGBT, of course, the present invention does not limit the specific implementation of the controllable switch) Effective as a variable resistor, the stray parameters are equivalent to a variable inductance according to the on-off state of the IGBT, and the capacitance is equivalent to an equivalent voltage source and resistance based on the historical state;
[0040] Secondly, the...
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The invention relates to a high-voltage direct-current circuit breaker simulation method, and belongs to the technical field of direct-current power transmission. The simulation method comprises the following steps that each power module on a transfer branch of the direct-current circuit breaker is equivalent to a branch voltage source, an equivalent resistor and a branch stray inductor which aresequentially connected in series; and according to the number N of the power modules connected in series on the transfer branch, the transfer branch is equivalent to a total voltage source and a totalstray inductance which are connected in series, the total voltage source is the sum of the voltages of the N branch voltage sources and the N equivalent resistors, and the total stray inductance is the sum of the N branch stray inductances. According to the method, all power modules on the transfer branch are equivalent to the total voltage source and the total stray inductance which are connected in series, the equivalent circuit is simple, the breaking process of the high-voltage direct-current circuit breaker is accurately described on the premise that the simulation rate is not reduced, and the accuracy of circuit breaker simulation is improved.
Description
technical field [0001] The invention relates to a simulation method for a high-voltage direct current circuit breaker, which belongs to the technical field of direct current transmission. Background technique [0002] As the key equipment to ensure the reliable operation of flexible DC systems, DC circuit breakers currently have three mature topologies: mechanical DC circuit breakers based on fast mechanical switches, all-solid-state circuit breakers based on power electronic devices, and hybrid DC circuit breakers. . The mechanical circuit breaker has a long breaking time, and the all-solid-state circuit breaker has a large on-state loss and high cost. The hybrid DC circuit breaker that combines the characteristics of the two has become the mainstream in the field of high-voltage direct current transmission. [0003] Such as figure 1 As shown, the hybrid DC circuit breaker generally includes three direct currents, the main branch, the transfer branch and the energy consum...
Claims
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IPC IPC(8): G06F17/50
CPCY02E60/60
Inventor 韩坤户永杰范彩云刘晨阳胡秋玲张志刚刘路路王宇丁李旭升宗炫君邹盛周洪伟姚艳芳王春生
Owner XJ ELECTRIC