A multi-objective optimization design method for a multi-terminal flexible direct current transmission system
A technology for DC transmission system, multi-objective optimization, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as lack of solutions and objectives that cannot be met at the same time, achieve good voltage balance effect, optimize sorting effect, and calculate Efficient effect
Active Publication Date: 2020-02-11
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +3
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Problems solved by technology
[0005] It can be seen that in the traditional voltage equalization method, the capacitance voltage balance of SM and the switching frequency of MMC are a pair of contradictions, and the two goals are mutually exclusive and cannot be satisfied at the same time. There is still no effective solution to the above problems in the prior art.
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[0046] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0047] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0048] As introduced in the background technology, there is a contradiction between the capacitor voltage balanc...
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The invention discloses a multi-objective optimization design method for a multi-terminal flexible direct current transmission system. The method comprises the steps that a multi-terminal flexible direct current transmission system model is built; model simulation of the multi-terminal flexible direct current transmission system is started; the direct current capacitance voltage of each sub-moduleof the multi-terminal flexible direct current transmission system is tested in real time; the current direction of each bridge arm of the multi-terminal flexible direct current transmission system ismonitored in real time and taken as a base for the judgment of capacitor charge discharge; the number of sub-modules required to be opened by the j th bridge arm of the i th terminal VSC of each switch cycle is calculated, the capacitor voltage is corrected by parameters to-be-optimized; the input excision state of the sub-module is determined, and sent to the control system, a voltage fluctuation target function and a switching times number objective function during stable operation are established; multi-objective genetic algorithm is adopted to solve the optimal set of optimization variables. The method simultaneously satisfies a better voltage balance effect and a lower switching frequency, makes both better meet requirements, and the computational efficiency is higher, the method isespecially suitable for the situation of multi terminal flexible direct current transmission.
Description
technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a multi-objective optimization design method for a multi-terminal flexible direct current transmission system. Background technique [0002] Multi-terminal flexible DC transmission system (Voltage Source Converter Multi-terminal HVDC, VSC-MTDC) refers to a flexible DC transmission system that contains three or more voltage source converter stations (voltage source converter, VSC) under the same DC network frame. Its most notable feature is that it can realize multi-power supply and multi-drop power receiving. As a more flexible and fast power transmission method, the multi-terminal flexible DC transmission system will have broad application prospects in the fields of wind power and other new energy grid integration and construction of urban DC distribution networks. With the rapid development of the voltage source converter, the DC transmission system based o...
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IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/00H02J3/36H02J2203/20Y02E60/60
Inventor 王瑞琪许玮吴绍军慕世友石鑫王超李笋王士柏
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY