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Voltage sag level calculation method for power system containing multiple STATCOM accesses under symmetric fault

A power system and voltage sag technology, applied in the field of AC power transmission, can solve problems such as poor effectiveness, lack of versatility, and inability to accurately quantify the improvement effect

Active Publication Date: 2019-12-03
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

In the case of symmetrical faults, for the power system without STATCOM access, the traditional short-circuit calculation method is usually used to calculate the voltage sag amplitude and phase angle of each bus. Some studies use the electromagnetic transient simulation method or analytical calculation method to calculate the voltage sag level of the power system including STATCOM, but the electromagnetic transient simulation method takes a long time and is not universal, and the proposed analytical calculation method is not suitable for many Therefore, none of the existing technologies can accurately quantify the effect of a configuration scheme composed of multiple STATCOM accesses on the power system voltage sag level, and cannot compare the pros and cons of different configuration schemes, resulting in ambiguity in STATCOM configuration decisions. Economical, less effective

Method used

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  • Voltage sag level calculation method for power system containing multiple STATCOM accesses under symmetric fault
  • Voltage sag level calculation method for power system containing multiple STATCOM accesses under symmetric fault
  • Voltage sag level calculation method for power system containing multiple STATCOM accesses under symmetric fault

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Embodiment

[0043] Such as figure 1 As shown, STATCOM is a parallel device, including coupling transformer, voltage source converter and DC capacitor. The reactive power exchange between the STATCOM and the system is controlled by adjusting the output voltage of the STATCOM. When the output voltage of the STATCOM is greater than the bus voltage, the STATCOM injects current into the system through the transformer to generate reactive power. When a fault occurs in the multi-electric power system and the voltage sag occurs on all buses, according to the operating characteristics of STATCOM, STATCOM will inject capacitive current into the system to maintain the voltage of the connected buses. Therefore STATCOM can be equivalent to a current source.

[0044] Such as image 3 As shown, a STATCOM with a capacity of 100MVA is installed on the No. 4 busbar and No. 6 busbar of the IEEE 30-node system, and a power system analysis model including STATCOM is constructed in Matlab based on the model ...

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Abstract

The invention relates to the technical field of alternating-current power transmission, in particular to a voltage sag level calculation method for a power system containing multiple STATCOM accessesunder a symmetric fault. The method comprises the following steps of: S1, establishing a STATCOM mathematical model for calculating a voltage sag level; S2, establishing a power system voltage sag level calculation model accessed by a plurality of STATCOMs under a symmetric fault; and S3, solving the voltage sag level of the power system containing a plurality of STATCOM accesses under the symmetric fault. According to the method, the blank of voltage sag level calculation of the multiple STATCOMs connected to the power system is filled, the method is accurate in calculation result and short in calculation time consumption, can be suitable for any node system and multiple STATCOM access conditions, and lays a theoretical foundation for STATCOM optimal configuration for voltage sag suppression.

Description

technical field [0001] The invention relates to the technical field of AC power transmission, and more specifically, to a method for calculating the voltage sag level of a power system with multiple STATCOMs connected under a symmetrical fault. Background technique [0002] The effect of STATCOM (Static Synchronous Compensator) on the voltage sag level is mainly reflected in the change of voltage phasor. After the STATCOM with different installation locations and installation capacity is connected to the power system, the voltage amplitude of each bus in the entire power system will be different. The phase angle will also change to some extent. In order to configure reasonable and effective STATCOM installation location and capacity, and maximize the control effect of STATCOM on voltage sag, it is necessary to accurately quantify the impact of STATCOM installation on the voltage sag of the entire power system, that is, to carry out voltage sag on the power system containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/10Y02E40/30
Inventor 王庆斌蔡日马明周廷模吴小宁黄辉李钙朱汉清李晓阳王余熙
Owner GUANGDONG POWER GRID CO LTD
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