Combined back-to-back direct current power transmission system reactive output power control method and system
A DC transmission system and output power technology, applied in the electric power field, can solve the problems of low reactive output power control efficiency, lack of reactive output power, etc., and achieve the effect of improving control efficiency
Active Publication Date: 2015-10-21
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0003] The back-to-back DC transmission system based on the combination of the conventional DC unit of the current source converter and the flexible DC unit of the voltage source converter is the combined back-to-back DC transmission system, which has a wide range of engineering application prospects. The output power control scheme leads to low efficiency of reactive output power control of combined back-to-back HVDC transmission system
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[0022] The specific implementation of the reactive output power control method and system of the combined back-to-back direct current transmission system of the present invention will be described in detail below with reference to the accompanying drawings.
[0023] refer to figure 1 , figure 1 Shown is a flowchart of a method for controlling reactive output power of a combined back-to-back direct current transmission system according to an embodiment, including the following steps:
[0024] S10, obtaining the hierarchical structure of the control system in the combined back-to-back direct current transmission system;
[0025] In the above step S10, the combined back-to-back DC power transmission system is a combination of no less than 2 DC units. Generally, its layered structure can be divided into a conventional DC unit and a flexible DC unit. The conventional DC unit and the flexible DC unit can be respectively Equipped with independent valve control system and unit contr...
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The invention relates to a combined back-to-back direct current power transmission system reactive output power control method and system. The combined back-to-back direct current power transmission system reactive output power control method comprises the following steps of acquiring the layered structure of a control system in a combined back-to-back direct current power transmission system; determining the reactive power control mode of the back-to-back power transmission system according to the layered structure; determining the reactive output power range of a flexible direct current unit in the combined back-to-back direct current power transmission system according to the reactive power control mode; calculating the direct current station control reactive difference of the combined back-to-back direct current power transmission system according to the reactive power control mode and the power range; and determining the reactive output power of the flexible direct current unit according to the reactive difference. The method achieves direct control on the reactive output power of the combined back-to-back direct current power transmission system. The reactive output power control efficiency can be further improved.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for controlling reactive output power of a combined back-to-back direct current transmission system. Background technique [0002] The combined back-to-back DC transmission system has no DC transmission line, and generally includes a flexible DC unit and a conventional DC unit. Its rectification and inverter are usually arranged in a converter station to realize the interconnection of the two AC networks. The flexible DC unit in the combined back-to-back DC transmission system has reactive power decoupling control, no AC filter, no external commutation voltage, no commutation failure, flexible control of AC bus voltage, and AC system failure. It has the advantages of emergency active support and dynamic reactive support. It has strong technical advantages in island power supply, urban distribution network expansion and transformation, AC system interc...
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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 刘涛李婧靓李明寻斌斌田凌黎小林
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD