A Sensitivity-Based Evaluation Method for Voltage Support Strength of Receiver System
A receiving end system, voltage support technology, applied in circuit devices, AC network circuits, power transmission AC networks, etc., to achieve the effect of simple steps and clear physical meaning
Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
The current indicators based on grid structure parameters are still unable to consider the operation mode of the receiving end system, and it is difficult to meet the flexible and changeable status of the receiving end system
Method used
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Embodiment
[0033] This embodiment provides a method for evaluating the voltage support strength of the receiving end system based on sensitivity. The flow chart of the method is as followsfigure 1 shown, including the following steps:
[0034] S1. Define the voltage support strength factor R of the receiving end system at the DC drop point of the receiving end system VSF as follows:
[0035]
[0036] Among them, U iN is the commutation bus voltage at the inverter side under the rated state; ΔQ i is the tiny reactive power injected into the commutation bus; keep the active power injected into the commutation bus constant, ΔU i is the obtained small voltage change on the commutation bus; P diN The active power injected into the receiving end system for the DC system under the rated state;
[0037] S2. Define the voltage support strength factor C of the critical receiving end system RVSF , C RVSF is the voltage support strength factor of the receiving end system when the DC system ...
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The invention discloses a sensitivity-based method for evaluating the voltage supporting strength of a receiving-end system. The method defines an index, namely the voltage supporting strength factorof the receiving-end system. Meanwhile, the critical value of the voltage supporting strength factor is defined through the critical power stability of a direct-current system. The voltage supportingstrength factor of the receiving-end system can be used for evaluating the voltage supporting strength of the receiving-end system. A stable domain stable in power under the rated state of the direct-current system is given based on the critical value. The voltage supporting strength factor of the receiving-end system can also be used for establishing the mathematical connection with the static voltage stability of a converter bus, so that the static voltage stability of the converter bus can be referenced. The method is good in adaptability when the grid structure, the operation mode or the internal power system element characteristic of the receiving-end system is charging. Therefore, the method can be adapted to the current changeable condition of the receiving-end system. The method has a wide application prospect.
Description
technical field [0001] The invention relates to the field of power system planning operation and control, in particular to a sensitivity-based evaluation method for voltage support strength of a receiving end system. Background technique [0002] With the implementation of my country's "West-to-East Power Transmission" strategy, a large number of high-voltage direct current transmission projects have been put into operation in my country, and a multi-circuit DC feed-in grid structure has been formed in the load centers such as the Yangtze River Delta and the Pearl River Delta, that is, the multi-feed DC system , referred to as "multi-infeed system". The increase in the capacity and number of DC systems fed into the same AC grid increases the risk of safe and stable operation of the grid, and brings a series of challenges to the normal operation of the grid. Therefore, it is very important to accurately measure the strength of the receiving end grid to ensure the good operati...
Claims
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 夏成军王真华夏谢家正李成翔
Owner SOUTH CHINA UNIV OF TECH