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Unified power flow controller equivalent modeling method based on switching period average principle

A technology of power flow controller and switching period, which is applied in the field of efficiency modeling and can solve the problems of complex modeling methods and so on.

Active Publication Date: 2018-07-13
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology

Some literatures have proposed a MMC fast electromagnetic transient simulation model that uses a custom numerical calculation module to solve the dynamic characteristics of each sub-module and cooperates with a controlled voltage source to model the output voltage of the bridge arm. This simulation model can be basically consistent with the detailed switch model simulation results, but this modeling method is still relatively complicated

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  • Unified power flow controller equivalent modeling method based on switching period average principle
  • Unified power flow controller equivalent modeling method based on switching period average principle
  • Unified power flow controller equivalent modeling method based on switching period average principle

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Embodiment 1

[0135] In order to verify the correctness of the above UPFC equivalent model, the equivalent model of UPFC was established in PSCAD / EMTDC according to the above method, and the equivalent model of STATCOM on the parallel side of UPFC and the equivalent model of UPFC static synchronous series compensator SSSC were respectively established And the equivalent capacitance C on the DC side dc , to realize the co-simulation calculation of UPFC.

[0136] The established MMC-UPFC consists of two parts: static synchronous series compensator SSSC and parallel static synchronous compensator STATCOM. The total capacity of UPFC converters is 3×250MVA, including 2 sets of series converters with a capacity of 2×250MVA; 1 set of parallel converters with a capacity of 250MVA. The UPFC structure is as follows figure 1 shown.

[0137] Parameters of each group of MMC converters:

[0138] a: Number of modules: N statcom =112+11 (redundancy);

[0139] b: Module voltage: U statcom.c =1607V

...

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Abstract

The invention relates to the technical field of electric system modeling and analysis, in particular to a unified power flow controller equivalent modeling method based on the switching period averageprinciple. The method comprises the steps that a unified power flow controller (UPFC) model based on a modularization multilevel converter (MMC) is composed of a static synchronous series compensator(SSSC) and a parallel static synchronous compensator (STATCOM), on the basis of the switching period average equivalent principle, alternating current side and direct current side equivalent controlled source models of the static synchronous compensator (STATCOM) are built, then, alternating current side and direct current side equivalent controlled source models of the series compensator (SSSC)are built separately, an equivalent capacitor is connected to a direct current bus between the static synchronous series compensator (SSSC) and the static synchronous compensator (STATCOM), and parallel side and series side combined equivalent modeling and simulation calculation of the UPFC is achieved. The dynamic characteristics of subsynchronous oscillation and low-frequency oscillation in a power system of the UPFC can be accurately reflected, the UPFC model is simplified, the calculation speed is increased, and the requirements for stable analysis and control precision of the power systemcan be met.

Description

technical field [0001] The invention relates to the technical field of power system modeling and analysis, in particular to an equivalent modeling method for a unified power flow controller based on the switching cycle averaging principle. Background technique [0002] The unified power flow controller (UPFC) based on the modular multilevel converter (MMC) has the advantages of good harmonic characteristics, easy modular design, compact size and no need for direct series connection of devices. , suitable for high-voltage and large-capacity transmission fields, can increase line transmission capacity, improve system transient stability, optimize power flow and reduce network loss, so it has been valued. [0003] The establishment of MMC-UPFC simulation models suitable for different application needs is the basis for simulation analysis of the application of MMC-UPFC in power systems. The accurate establishment of electromagnetic transient models that reflect the actual sub-mo...

Claims

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Application Information

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IPC IPC(8): G06F17/50H02J3/18
CPCH02J3/1814G06F30/20H02J2203/20Y02E40/10
Inventor 陆振纲祁欢欢于弘洋蔡林海赵国亮刘建坤陈静
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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