Reactive coordination control method for direct current converter alternating current filter and phase modifier

A technology of AC filter and DC converter station, applied in AC network to reduce harmonic/ripple, reactive power adjustment/elimination/compensation, reactive power compensation, etc. Insufficient power compensation capacity, increased risk of grid voltage instability, etc., to achieve the effect of strengthening stability

Active Publication Date: 2017-08-29
NARI TECH CO LTD +1
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  • Application Information

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Problems solved by technology

When the AC or DC system fails, it will cause fluctuations in the AC bus voltage, and the insufficient dynamic

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  • Reactive coordination control method for direct current converter alternating current filter and phase modifier

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[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0020] A reactive power coordinated control method for an AC filter and a condenser of a DC converter station, specifically including:

[0021] 1) In the case of steady-state AC voltage in the DC converter station, sufficient dynamic reactive power reserve is left at the operating point of the condenser.

[0022] In the case of steady-state AC voltage of the DC converter station, the reactive power of the condenser and the reactive power of the AC filter are coordinated and distributed, and the control goal is to keep the bus voltage of the DC converter station constant, so that the condenser has sufficient dynamic reactive power reserve. If the condenser operates at the sending end of DC tran...

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Abstract

The invention discloses a reactive coordination control method for a direct current converter alternating current filter and a phase modifier. The reactive coordination control method comprises the steps of reserving enough dynamic reactive power storage for operating points of the phase modifier in a steady-state condition of a direct current converter alternating current voltage; for ensuring the dynamic reactive power storage of the phase modifier while a condition of switching of the alternating current filter is needed, controlling the phase modifier to act in advance, controlling the reactive power increasing or decreasing direction to be opposite to the reactive power changing direction caused by switching of the alternating current filter, so as to reduce alternating current voltage fluctuation caused by switching of the alternating current filter; and under the condition of the direct current converter alternating current voltage fluctuation, if the extremity of the phase modifier is reached while the alternating current voltage still cannot be regulated to a preset value, performing rapid switching of the alternating current filter for ensuring stability of the alternating current voltage. By virtue of the reactive coordination control method, the technical problem of not high coordination degree between the phase modifier and the direct current converter reactive compensation equipment in the prior art is solved, and the stability of an alternating current and direct current parallel serial system can be reinforced.

Description

technical field [0001] The invention relates to a reactive power coordination control method for an AC filter and a condenser of a direct current converter station, belonging to the field of high-voltage direct current transmission control. Background technique [0002] my country's energy distribution and load development are extremely unbalanced. Hydropower resources are mainly concentrated in several provinces in the southwest, coal resources are mainly concentrated in Shanxi, Shaanxi and western Inner Mongolia, wind power and solar power are also concentrated in the northwest, and loads are mainly concentrated in the eastern coastal areas. Therefore, long-distance large-capacity power transmission is imperative. In recent years, my country's UHV transmission technology has developed rapidly, the UHV transmission distance has increased from hundreds of kilometers to several thousand kilometers, and the single-circuit line transmission capacity has increased to 8 million ki...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18H02J3/36
CPCH02J3/01H02J3/1821H02J3/36Y02E40/30Y02E40/40Y02E60/60
Inventor 许其品王庆杨铭邵宜祥袁亚洲杨鹏程
Owner NARI TECH CO LTD
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