LCC-HVDC topological structure into which controllable sub-modules are connected in series

A technology of LCC-HVDC and topological structure, applied in the direction of power transmission AC network, etc., can solve problems such as loss of self-recovery ability of converter, deterioration of commutation performance of inverter, current harmonic pollution, etc., to achieve input and exit Flexible and controllable, improving stability and prolonging service life

Active Publication Date: 2014-08-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

But CCC has the following problems: when the voltages on the three commutation capacitors are unbalanced, the commutation performance of the inverter will deteriorate; in the event of a commutation fault, the capacitors are continuously charged to overvoltage, and the converter will lose self-recovery capacity; the introduction of capacitors causes current harmonic pollution problems in DC transmission systems

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  • LCC-HVDC topological structure into which controllable sub-modules are connected in series
  • LCC-HVDC topological structure into which controllable sub-modules are connected in series
  • LCC-HVDC topological structure into which controllable sub-modules are connected in series

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] 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.

[0042] 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 ...

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Abstract

The invention provides an LCC-HVDC topological structure into which controllable sub-modules are connected in series. According to the topological structure, the controllable sub-modules are connected to six valve arms of a six-impulse current converter in series, the working states of the controllable sub-modules are changed to assist phase converting, and the capability for resisting phase converting failures of a direct current power transmission system is improved. The LCC-HVDC topological structure can improve the capability for resisting the phase converting failures of the direct current power transmission system and cannot give rise to harmonic problems under the normal operation situation.

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. Background technique [0002] Line-Commutated-Converter High Voltage Direct Current (LCC-HVDC) has been widely used in the world due to its advantages in long-distance large-capacity power transmission and fast active power control; however, due to its The use of thyristors that cannot be self-shutdown as commutation devices requires a certain strength of the AC system to provide commutation voltage, which has certain limitations, especially the problem of commutation failure. [0003] At the end of the commutation process, if the valve that has just exited conduction fails to recover the forward voltage blocking capability within a period of time when the reverse voltage is applied, or the commutation process fails to end, the voltage will be commutated after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 倪晓军赵成勇刘羽超郭春义许韦华阳岳希
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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