Step-by-step site selection and multi-objective optimization capacity determination method for current power flow controller
A technology of power flow controller and multi-objective optimization, applied in power transmission AC networks, electrical components, circuit devices, etc., can solve problems such as unreasonable constraints, and achieve the effect of improving economy
Pending Publication Date: 2021-11-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0003] Most of the existing research on DC CFC site selection and capacity determination is based on sensitivity or intelligent algorithm optimization. However, in actual engineering applications, DC CFC site selection often focuses more on using its power flow regulation capabilities to improve system transmission capacity and solve problems affecting transmission safety. Therefore, it is unreasonable to constrain DC CFC site selection with sensitivity index and economic index
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Embodiment
[0092] In order to verify the effectiveness of the scheme of the present invention, the effectiveness of the proposed method is verified by taking the DC power grid formed by adding branches L13 and L15 to the Zhoushan five-terminal DC system as an example, and the voltage level of the power grid is 400kV.
[0093] image 3 The grid topology is shown. 1, 2, 3, 4, and 5 in the figure are the numbers of the converter stations, the number of AC-DC converter stations (nodes) is 5, node 1 of the converter station is the V node, and the remaining nodes are P nodes.
[0094] Table 1 shows the DC grid system parameters before installing CFC.
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The invention discloses a step-by-step site selection and multi-objective optimization capacity determination method for a current power flow controller. The method comprises the following steps of: inputting power grid initial data; carrying out initial load flow calculation on a DC power grid; establishing a comprehensive index system considering DC line power flow performance and converter station DC output voltage performance for the DC power grid; screening all lines according to a DC CFC site selection principle to obtain a target line set gamma meeting the installation requirement; carrying out main DC CFC site selection under the normal operation condition; performing site selection of a standby DC CFC under the N-1 operation condition; taking economy and safety indexes as comprehensive evaluation indexes, establishing a DC CFC capacity multi-objective optimization function, and converting multi-objective optimization into single-objective optimization by adopting a linear combination optimization method with conversion weighting; establishing an optimization constraint condition by using a conventional power system constraint and a DC CFC internal power constraint; and taking the capacity of a DC CFC main control line / auxiliary control line converter as a variable to be optimized, and performing optimization by using a genetic algorithm to obtain the optimal capacity. The step-by-step site selection and multi-objective optimization capacity determination method is high in practicability, scientific and reasonable.
Description
technical field [0001] The invention relates to a current flow controller, in particular to a step-by-step site selection and multi-objective optimization method for capacity determination of the current flow controller. Background technique [0002] The current flow controller (DC current flow controller, DC CFC) provides the possibility for the further development of the DC power grid by virtue of its powerful power flow regulation ability, simple structure and the potential to expand multiple degrees of freedom. As a voltage-changing DC power flow controller, DC CFC is somewhat different from the traditional DC / DC converter type and auxiliary voltage source type power flow controller topology. It has a simple structure, requires fewer power electronic devices, and only performs directional and quantitative transmission of power flows between lines without energy exchange with the external power grid. It does not need to withstand high voltage at the system level. Good ap...
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IPC IPC(8): H02J1/00H02J3/36
CPCH02J1/00H02J3/36H02J3/008H02J2203/10H02J2203/20Y02E60/60
Inventor 王谱宇甄浩王松杨伟卜京
Owner NANJING UNIV OF SCI & TECH
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