Capacitor commutation type direct-current circuit breaker topology with re-closing judgment capability and suitable for direct-current power grid
A technology for DC circuit breakers and DC power grids, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high construction cost of high-voltage DC circuit breakers, failure to determine the type of fault, etc., to shorten energy dissipation time and reduce misjudgment Risk, the effect of reducing the number of IGBTs
Pending Publication Date: 2021-02-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the disadvantages of high construction cost and inability to determine the fault type of current high-voltage DC circuit breakers
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[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0016] The topology of capacitor commutated DC circuit breaker with reclosing judgment ability suitable for DC power grid is as follows: figure 1 As shown, the topology of the DC circuit breaker includes the main branch, the commutation branch, the diversion branch and the fault type discrimination branch. The main branch is composed of fast mechanical switches, diodes, thyristors, and IGBTs; the commutation branch is composed of resistors, capacitors, fast mechanical switches, diodes, and metal oxide arresters; the drainage branch is composed of thyristors and resistors; the fault type discrimination branch is composed of resistors, composed of fast mechanical switches.
[0017] The fault current flow path in the fault detection stage is as follows: figure 2 shown, assum...
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The invention relates to a capacitor commutation type direct-current circuit breaker topology with re-closing judgment capability and suitable for a direct-current power grid, and belongs to the technical field of direct-current power grid fault clearing. The DC circuit breaker topology comprises a main branch circuit, a commutation branch circuit, a drainage branch circuit and a fault type discrimination branch circuit, wherein the main branch is composed of a rapid mechanical switch, a diode, a thyristor and an IGBT; the commutation branch is composed of a resistor, a capacitor, a rapid mechanical switch, a diode and a metal oxide arrester; the drainage branch is composed of a thyristor and a resistor; and the fault type discrimination branch is composed of a resistor and a rapid mechanical switch. The main branch in the direct-current circuit breaker topology has a bidirectional current breaking capability; the commutation branch can break a DC fault line, and the commutation branchdoes not contain the IGBT, so that the cost of the DC circuit breaker can be greatly reduced. The fault type discrimination branch can distinguish an instantaneous fault from a permanent fault, thereby preventing severe damage to the system caused by blind re-closing to the permanent fault.
Description
technical field [0001] The invention relates to a capacitor commutation type direct current circuit breaker topology suitable for a direct current power grid and capable of judging reclosing, and belongs to the field of multi-terminal direct current and direct current power grids. Background technique [0002] Flexible DC transmission has significant advantages in renewable energy grid connection, island power supply, and AC system interconnection, and has become the development trend of the future smart grid. Due to the low inertia and weak damping characteristics of the DC power grid, the fault current develops rapidly after a short-circuit fault occurs in the DC line. Therefore, after the fault occurs, fast and accurate removal of the fault line is the key to ensure the reliable operation of the DC power grid. DC circuit breakers are widely used because they can selectively cut off specific lines during DC line faults without blocking all converter stations. At present, ...
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Login to View More IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 蒋纯冰赵成勇杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)