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A Calculation Method of Harmonic Power Flow Including vsc

A calculation method and harmonic power flow technology, which is applied in the field of harmonic power flow calculation including VSC, can solve problems such as not considering VSC type components, achieve order reduction, simple and efficient solution process, and improve power quality

Active Publication Date: 2021-02-26
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The current mature harmonic power flow calculation methods do not consider VSC type components

Method used

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  • A Calculation Method of Harmonic Power Flow Including vsc
  • A Calculation Method of Harmonic Power Flow Including vsc
  • A Calculation Method of Harmonic Power Flow Including vsc

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing, implementation process of the present invention is described in further detail:

[0045] One, right figure 2 In the power system including b VSCs and their AC side transformers, and a non-VSC AC node, the fundamental wave power flow calculation is performed to obtain the fundamental wave voltage of each node in the power system; As a PQ node, other non-VSC AC nodes are regarded as PQ nodes, or PV nodes, or Vθ nodes. Calculation results of the fundamental wave power flow, including the effective value U of the fundamental wave voltage of the AC side node of the VSC AC and phase angle θ;

[0046] 2. Substitute the obtained fundamental voltage of the VSC AC side node and the given DC side voltage into the following formula to obtain the VSC modulation ratio M:

[0047]

[0048] Among them, M is the modulation ratio of VSC; U AC is the RMS value of the fundamental line voltage on the AC side of VSC, V DC is the DC sid...

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Abstract

The invention discloses a method for calculating the harmonic power flow including VSC. Firstly, the calculation of the fundamental wave power flow is performed to obtain the fundamental wave voltage of each node and the modulation ratio of the VSC; The three input data of frequency are substituted into the harmonic model formula of VSC to obtain the harmonic content of the AC side voltage of VSC, and the VSC is approximately regarded as a harmonic voltage source. Then, in order to realize the interface between the VSC harmonic voltage source model and the harmonic power flow, the VSC and its AC side transformer are equivalent to a harmonic current source with internal impedance by using the Norton equivalent theorem, forming a harmonic admittance matrix, Then use the harmonic current injection method to solve the harmonic power flow.

Description

technical field [0001] The invention belongs to the field of harmonic analysis of electric power systems, and in particular relates to a calculation method of harmonic power flow including VSC. Background technique [0002] With the development of the power system, more and more nonlinear components such as power electronic components and new energy sources are put into the power system, and the harmonic problem of the power system becomes more and more prominent. In recent years, the high-voltage direct current transmission VSC-HVDC based on the voltage source converter VSC, or the flexible direct current transmission FACTS technology has developed rapidly, and has excellent characteristics in many fields of power systems. However, the harmonic analysis of this new type of power electronic system It still mainly relies on electromagnetic transient simulation of detailed models and FFT analysis of steady-state waveforms. For systems with a certain scale and complexity, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/01
CPCH02J3/06H02J3/01H02J2203/20Y02E40/40
Inventor 洪潮赵勇涂亮张野袁豪陈晓雯焦在滨李建华
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD