Voltage-sharing simulation method of series multi-fracture mechanical switch in hybrid direct-current circuit breaker
A technology of DC circuit breaker and mechanical switch, applied in AC network circuits, circuit devices, power transmission AC networks, etc., can solve problems such as poor economy, low versatility, and poor practicability, and achieve a high degree of versatility and reliability. Strong, low-cost effect
Active Publication Date: 2019-09-20
WUHAN UNIV
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Problems solved by technology
This method has the following defects: ①The software used in the simulation calculation is limited, and its versatility is low; ②The details of the implementation of the simulation and the specific basis for the selection of the simulation calculation of the equalizing resistance-capacitance parameters are not clearly given, and the actual implementation is not strong; ③ In the end, it is necessary to determine the selected parameters through multiple high-voltage tests. The cost of test equipment is high and the economy is poor.
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[0035] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0036] This embodiment proposes a simulation method for voltage equalization of series-connected multi-fracture mechanical switches in a hybrid DC circuit breaker. This method accurately calculates the voltage distribution and distributed capacitance parameters of series-connected multi-fracture mechanical switches after installing a voltage equalizing component through finite element field simulation. Based on the field simulation results, the resistance-capacitance circuit model is extracted, the parameter value range of the voltage equalization component is obtained by simulation, and the basis for determining the parameters of each voltage equalization component is explained in detail, which can solve the problem of the current DC series multi-fracture mechanical switch voltage equalization. The parameters of the pressure element lack specific basis...
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The invention relates to the protection technology of direct-current power grid equipment, in particular to a voltage-sharing simulation method of a series multi-fracture mechanical switch in a hybrid direct-current circuit breaker; the voltage distribution and distribution capacitance parameters of the series multi-fracture mechanical switch after a voltage-sharing assembly is mounted are calculated through finite element field simulation; a resistance-capacitance circuit model is extracted on the basis of a field simulation result, the parameter value range of the voltage-sharing assembly is obtained in a simulation mode, and the simulation determination basis of each voltage-sharing element parameter is described in detail, so that the problem that the determination of the parameter of the voltage-sharing element lacks a specific basis in the current direct-current series multi-fracture mechanical switch voltage-sharing can be solved. The method can be used for voltage-sharing design of the series multi-fracture mechanical switch for the hybrid high-voltage direct-current circuit breaker, and voltage-sharing design is carried out through circuit simulation, so that the simulation result is high in reliability and high in accuracy. The voltage distribution and voltage sharing degree of each fracture can be remarkably improved. The method has the advantages that the cost is low, the used software is not limited, and the universal degree is higher.
Description
technical field [0001] The invention belongs to the technical field of DC power grid equipment protection, and in particular relates to a voltage equalization simulation method for series-connected multi-fracture mechanical switches in a hybrid DC circuit breaker. Background technique [0002] Flexible DC grid technology has the characteristics of flexible control, high reliability, independent power regulation, and a small number of converter stations. It provides a safe and efficient solution for new energy grid connection and consumption, island power supply, and cross-regional power transmission. one of the directions of development. The establishment of a high-voltage DC power grid is an effective means to solve problems such as inter-regional power transmission and large-scale renewable energy grid integration. The construction of flexible DC power grids depends on the research of DC power grid protection technology. The high-voltage DC circuit breaker is the key equ...
Claims
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Login to View More IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 黄道春全万霖王学宗李冠南杨秋玉
Owner WUHAN UNIV