A method for selecting the location of the modulator to improve the strength of the DC multi-feed receiving end power grid

A receiving-end power grid and multi-infeed technology, applied in the direction of electrical components, single-network parallel feeding arrangement, etc., can solve the problems that cannot effectively measure the improvement effect of the DC multi-infeed system strength of the condenser, and achieve economical effects Highlight and enhance the voltage support capability and reduce the effect of configuration capacity

Active Publication Date: 2022-07-26
WENZHOU ELECTRIC POWER BUREAU +1
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Problems solved by technology

[0005] The present invention proposes a method for selecting the location of the DC multi-infeed receiving end power grid to improve the strength of the DC multi-infeed receiving end grid, which overcomes the fact that the traditional method for selecting the location of the capacitor cannot effectively measure the effect of the installation position of the capacitor on the strength of the DC multi-infeed system.

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  • A method for selecting the location of the modulator to improve the strength of the DC multi-feed receiving end power grid
  • A method for selecting the location of the modulator to improve the strength of the DC multi-feed receiving end power grid
  • A method for selecting the location of the modulator to improve the strength of the DC multi-feed receiving end power grid

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[0029] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] A typical AC-DC hybrid multi-infeed DC system is established. The specific DC system used adopts the standard model proposed by the CIGRE DC working group in 1991. The specific model is as follows: figure 2 shown. In this standard model, the RLC filter is replaced by a reactive compensation capacitor, and the reactive power consumed by DC is fully compensated by the reactive compensation capacitor. like figure 1 shown, where P 1 ,…P n Power delivered for DC, z 11 ,…z nn is the Thevenin equivalent impedance of the receiving-end AC system. The DC multi-feed system is obtained by its extension. The strength of the AC-...

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Abstract

The invention discloses a method for selecting a camera location for improving the strength of a DC multi-feed receiving-end power grid. The strength of the DC multi-feed receiving-end power grid is judged according to a generalized short-circuit ratio index, and the generalized short-circuit ratio sensitivity analysis method is used to find The DC multi-feed is the weak link of the DC drop point of the receiving-end power grid, and the node is used as the installation site of the camera. By calculating the generalized short-circuit ratio sensitivity and sorting, the node with the highest sensitivity is selected as the best camera installation site. The advantages of the present invention are that: it can quantitatively measure the effect of installing a condenser at each node on the strength of the DC multi-feed receiving-end power grid, effectively improving the voltage support capability of the DC multi-feeding receiving-end power grid, and ensuring the AC and DC Under the premise of stable operation of the hybrid DC multi-feed system, the configuration capacity of the camera is reduced, and its economic effect is outstanding.

Description

technical field [0001] The invention relates to a method for selecting a location for a camera, in particular to a method for selecting a location for a camera for improving the strength of a DC multi-feed receiving end power grid. Background technique [0002] In recent years, renewable energy power generation in the west and north of my country has been greatly developed. At the same time, due to the continuous increase in the load in the southeast coastal areas of my country, cross-provincial and cross-regional long-distance high-voltage direct current transmission projects have begun to be constructed. At present, areas and regions with intensive DC feeds such as East China Power Grid and China Southern Power Grid have formed a large-scale DC multi-feed transmission system that is unique in the world. They are mainly responsible for sending hydropower in the southwest region and thermal power in the northwest region and wind power into the east. Load center and regional ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00H02J3/44
CPCH02J5/00H02J3/44
Inventor 赵寿生孙维真周泰斌叶琳孙景钌张静汪家铭郑昌庭周正阳杨滢李东梧周靖皓石博隆辛焕海赵碚项烨鋆胡长洪刘津源
Owner WENZHOU ELECTRIC POWER BUREAU
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