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Capacitor bank switching method under harmonic conditions

A technology of capacitor banks and capacitors, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as less consideration of harmonics, and achieve the effect of harmonic suppression

Inactive Publication Date: 2013-07-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for switching capacitor banks under harmonic conditions, which solves the problem that voltage, reactive power and power factor are often used as control targets in existing substation voltage and reactive power control, but less harmonics are considered

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  • Capacitor bank switching method under harmonic conditions
  • Capacitor bank switching method under harmonic conditions
  • Capacitor bank switching method under harmonic conditions

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Embodiment Construction

[0023] The present invention relates to the switching method of capacitor banks in consideration of harmonics in substation voltage and reactive power control, and the operation process can be seen in detail figure 1 shown. Combine now figure 1 and figure 2 While being specific, it should be emphasized that the following description is illustrative only and not intended to limit the scope of the invention and its application.

[0024] Step 1: Substation voltage and reactive power control (VQC) strategies include the traditional nine-area map, and the twelve-area map and seventeen-area map developed from it. The substation voltage and reactive power control improves the voltage U, reactive power Q and power factor by adjusting the tap of the on-load tap changer and switching the parallel compensation capacitor bank, so as to improve the quality of power supply. When the VQC judges that n groups of capacitors need to be put into operation, the switching strategy of the capac...

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Abstract

The invention discloses a capacitor bank switching method under harmonic conditions, and belongs to the technical field of capacitor banks. Harmonic compensation is performed to a maximum extent. The technical scheme includes: firstly, a bus voltage, idle work requirements and harmonic conditions at the position, where compensation is needed, of a transformer substation are determined, and a capacitor bank needing to be compensated is determined through VQC; then an equivalent mathematical model of the transformer substation is given, wherein reactance values of a current limiting reactor and a third winding of a transformer are taken into account; and finally, the harmonic conditions of the transformer substation are summarized to four kinds, a corresponding considering and calculating method is given aiming at each harmonic condition so as to obtain the optimal compensation capacitor bank. The capacitor bank switching method under the harmonic conditions has the advantages that a switching strategy of the capacitor bank in the VQC of the transformer substation under various harmonic conditions, namely, under the various harmonic conditions, capacitor banks with different reactance rates are combined in an optimal mode, and under the premise that the VQC is met, the maximum compensation effects on harmonic waves are achieved.

Description

technical field [0001] The invention belongs to the technical field of capacitor banks, and in particular provides a capacitor bank switching method under harmonic conditions, which is suitable for substation voltage and reactive power control (VQC) and can compensate harmonics to the greatest extent. Background technique [0002] At present, many substations in China have installed on-load voltage regulating transformers and parallel compensation capacitor banks for voltage and reactive power regulation. The on-load tap changer can adjust the system voltage and reactive power under the condition of load. In addition to improving the power factor of the system, the parallel compensation capacitor bank can also adjust the system voltage, maintain the stability of the system voltage, and improve the quality of power supply. [0003] In substation voltage and reactive power control, the control strategy has been developed from the traditional nine-area map to the current twelve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 徐永海洪旺松陶顺李琼林刘书铭张振安
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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