A lcc-hvdc topology and its controllable sub-module charging initial voltage determination method

A technology of LCC-HVDC, initial charging voltage, applied in power transmission AC network and other directions, can solve problems such as threats to the normal operation of controllable sub-modules, deterioration of inverter commutation performance, and loss of self-recovery ability of inverters

CN103986178BInactive Publication Date: 2017-01-04NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-01-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an LCC-HVDC topological structure internally provided with controllable sub-modules in series. The topological structure is characterized in that six valve arms of a six-pulse converter are connected with the controllable sub-modules in series. The invention further provides an optimal charging initial voltage determining method for the controllable sub-modules of the LCC-HVDC topological structure internally provided with the controllable sub-modules in series, the method is used for preventing the capacitor voltage of the controllable sub-modules from being out of control, ensuring normal work and operation of the controllable sub-modules and enhancing the function of preventing LCC-HVDC topology swapping phase failures.
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Description

technical field

[0001] The invention relates to a device in the technical field of power transmission and distribution, in particular to an LCC-HVDC topology structure connected in series with controllable sub-modules and a method for determining the initial charging voltage of the controllable sub-modules. Background technique

[0002] Since the 1950s, the line-commutated-converter high-voltage direct current (LCC-HVDC) of the traditional power grid has gained rapid popularity worldwide due to its large-capacity long-distance power transmission and fast controllable active power. develop. However, since it uses a thyristor that cannot be turned off automatically as a commutation device, it needs a certain strength of the AC system to provide the commutation voltage, which has certain limitations, especially the problem of commutation failure. The occurrence of commutation failure severely limits the transmission power of the DC system, causing the transmission power to sud...

Examples

Embodiment Construction

[0048] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] The invention provides an LCC-HVDC topology structure with controllable sub-modules connected in series. pressure circuit. The controllable sub-module includes a capacitor and a sequentially connected device group consisting of a diode and an IGBT.

[0050] The number of the above device groups is two; the numbers of diodes and IGBTs are one respectively. The collector of the IGBT of the device group 1 of the device group is connected to the anode of the diode; the emitter of the IGBT of the device group 2 of the device group is connected to the cathode of the diode; the cathode of the diode of the device group 1 is connected to the collector of the IGBT of the device group 2 Connection; the anode of the diode of the device group 2 is connected to the emitter of the IGBT of the device group 1; the anode and the cathode of ...