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Distribution network low voltage variable coefficient control method and system

A control method and voltage control signal technology, which is applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve the problems that the power system cannot be satisfied, and the reactive power compensation device cannot adjust the voltage and power factor at the same time.

Active Publication Date: 2018-05-15
GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
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Problems solved by technology

[0005] Based on this, it is necessary to provide a low voltage variable coefficient control method and system for the distribution network to realize the problem that the existing reactive power compensation device cannot adjust the voltage and power factor at the same time, resulting in the failure to meet the actual requirements of the power system. Simultaneous regulation of voltage levels and power factors on distribution network branches to meet the complex demands of power systems

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  • Distribution network low voltage variable coefficient control method and system
  • Distribution network low voltage variable coefficient control method and system
  • Distribution network low voltage variable coefficient control method and system

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] In one example, see figure 1 As shown, a distribution network low voltage variable coefficient control method, the method includes the following steps:

[0022] S110 Acquire the reactive power value at the head end and the voltage value at the end of the distribution network branch.

[0023] In this embodiment, in order to dynamically adjust the voltage and power factor of the compensated line at the same time, the head end and the end of the distribution network branch are selected as monitoring points, and the voltage and current values ​​at the head end and the end are collected in real time, so that Get the reactive power value at the head end and the voltage value at the end end.

[0024] S120 Calculate a reactive power error value according to the reactive power value, calculate a voltage error value...

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Abstract

The invention relates to a power distribution network low voltage variable coefficient control method and system, which obtain a power factor control signal and a voltage control signal according to the reactive power value at the first end of a power distribution network branch and the voltage value at the rear end, dynamically adjust the weighting coefficients of the power factor control signal and the voltage control signal based on the change of the voltage values at the rear end, perform weighted combination on the power factor control signal and the voltage control signal according to the dynamically adjusted variable weighting coefficients, finally obtain a composite control signal, employ the composite control signal as a control signal of a magnetically controlled reactor DC excitation source in a magnetically controlled static reactive power compensator, and control the saturation degree of a magnetically controlled reactor core, thereby allowing the reactance value of the magnetically controlled reactor to change, adjusting the reactive power output of the magnetically controlled static reactive power compensator, further adjusting the voltage and power factors in a power distribution network until reaching an allowable range, and optimizing the voltage and power factor adjusting effect of the distribution network branch.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a method and system for controlling low-voltage variable coefficient of a distribution network. Background technique [0002] Voltage is an important indicator to measure power quality. All kinds of electrical equipment are designed and manufactured according to the rated voltage. These devices will perform best when operated at their rated voltage. If the voltage deviates too much from the rated value, it will have adverse effects on users. Common electrical equipment in power systems are asynchronous motors, various electric heating equipment, lighting lamps, and household appliances that have increased in recent years. When the voltage is too low, the efficiency of the electrical equipment will decrease, affecting the quality and efficiency of production; when the voltage is too high, the life of the electrical equipment will be shortened. Excessive voltage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor 潘靖李清波肖静薇许永创袁佳歆罗璇瑶袁明阳朱远哲李文波李俊松杜树壮郑立强罗滨陈管丹林育锦郑斌
Owner GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
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