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Power grid wide-area voltage control method, system and equipment

A wide-area voltage and control method technology, applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve the problems of discontinuous control and low transient voltage stability of the power grid, and achieve continuous control and improve transient voltage stability. sexual effect

Active Publication Date: 2017-05-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0003] The traditional method of controlling transient voltage stability is to cut machines and loads, switch capacitors and other operations according to the wide-area information of the power grid, but these controls are all discontinuous controls, resulting in low stability of the transient voltage of the power grid

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  • Power grid wide-area voltage control method, system and equipment
  • Power grid wide-area voltage control method, system and equipment
  • Power grid wide-area voltage control method, system and equipment

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Embodiment Construction

[0028] refer to figure 1 , a method for controlling the wide-area voltage of a power grid in an embodiment of the present invention includes steps S110 to S170.

[0029] S110: Obtain synchronous voltage values ​​of multiple buses. The synchronous voltage value corresponds to the voltage value of multiple buses at the same time.

[0030] The plurality of buses may include all buses in the power grid that need to detect voltage values, thereby realizing wide-area voltage detection of the power grid. The voltage of the bus can be detected by configuring a PMU (Phasor Measurement Unit) on the bus.

[0031] When receiving multiple busbars corresponding to the voltage value at the same time, each voltage value data received by the system may have different delays. Experiments have proved that the time delay τ for obtaining multiple bus voltage values ​​satisfies a normal distribution, that is, τ~N(μ,σ 2 ). In one embodiment, step S110 includes step 112 and step 114 .

[0032] ...

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Abstract

The invention relates to a power grid wide area voltage control method, a power grid wide area voltage control system and power grid wide area voltage control equipment. The power grid wide area voltage control method comprises the steps of acquiring synchronous voltage values of multiple bus lines; selecting the minimum voltage value in the multiple synchronous voltage values, and calculating the difference value of a preset threshold value and the minimum voltage value; acquiring an additional voltage value according the difference value of the preset threshold value and the minimum voltage value; acquiring a regulated voltage reference value according to the additional voltage value and the primary voltage reference value of an electric generator, and sending the regulated voltage reference value to an excitation system of the electric generator so as to regulate the machine end voltage and output reactive power of the electric generator. By taking the additional voltage value as the feedback, the voltage reference value of the excitation system of the electric generator is regulated, so that the regulated voltage reference value is obtained and is sent to the excitation system of the electric generator, the electric generator can feel the voltage of the bus lines, and the output reactive power is increased when the voltage is relatively low, so that the power grid wide area voltage can be continuously controlled, and further, the transient voltage stability of a power grid can be improved.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a method, system and equipment for wide-area voltage control of a power grid. Background technique [0002] The power grid is a whole composed of substations and transmission lines of various voltages in the power system. The number of high-voltage DC transmission lines in the power grid is gradually increasing, and the electrical distance of each DC drop point is relatively close, showing a strong coupling effect between them. Therefore, after the power system fails, multiple DC converters may fail to commutate simultaneously or successively. If the reactive power reserve provided by the AC system at the receiving end is insufficient, it may cause serious voltage stability problems. At present, the synchronous generator is the main dynamic reactive power source in the power grid. Making full use of the reactive power reserve capacity of the generator to provide d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 周保荣谢小荣董宜鹏洪潮金小明姚文峰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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