Data-driven dynamic reactive power reserve demand assessment method for DC receiving end grid
A technology driven by terminal power grid and data, applied in reactive power compensation, AC network circuit, power transmission AC network, etc., it can solve problems such as difficult online analysis, changes in reactive power reserve demand, and difficulty in solving grid reactive power reserve demand, etc. Achieve the effect of improving the effect, fast calculation speed, and strong generalization ability
Active Publication Date: 2021-06-04
EAST CHINA BRANCH OF STATE GRID CORP +2
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Problems solved by technology
[0005] The scale of the actual receiving end power grid is usually very large, and it is difficult to solve the reactive power reserve demand of the power grid with nonlinear dynamics method or transient energy function method
In addition, due to the randomness of load and the fluctuation of new energy generation output, the reactive power reserve demand of the receiving end grid will change rapidly
The method based on time domain simulation needs repeated iterations to estimate the reactive power reserve demand of the power grid, and it is difficult to be used for online analysis
Method used
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Embodiment Construction
[0140] The data-driven dynamic reactive power reserve demand assessment method of the DC receiving end power grid proposed by the present invention includes the following steps:
[0141] (1) Establish an offline sample library of the DC receiving-end grid. Each sample in the offline sample library includes the characteristic quantity of the DC receiving-end grid and the dynamic reactive power reserve demand. The DC receiving-end grid is defined as a secondary DC transmission in the grid. The regional power grid that receives electric energy through the line, the dynamic reactive power reserve demand of the power grid is used to ensure the minimum value of the dynamic reactive power source capacity required for the transient voltage stability of the power grid. Specifically include the following steps:
[0142] (1-1) Extract the transient voltage stability characteristic quantity near the DC inverter converter station in the DC receiving-end power grid, the process is as follow...
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The invention relates to a data-driven dynamic reactive power reserve demand evaluation method of a DC receiving end power grid, belonging to the technical field of power system operation control. The present invention uses an index to quantify and evaluate the transient voltage stability in the vicinity of the DC inverter station, and iteratively calculates the dynamic reactive power reserve requirement in the vicinity of the DC inverter station based on numerical simulation, and stores the calculation results and characteristic quantities to the offline sample repository. Aiming at the problem of online evaluation of dynamic reactive power reserve in the vicinity of DC inverter converter stations, a data mining model is constructed and trained based on offline sample sets. A method of periodically updating the sample set is proposed to update the data mining model periodically. Read the operation mode data online from the power grid, extract the characteristic quantity of the online system, and use the data mining model to quickly evaluate the demand for dynamic reactive power reserve online.
Description
technical field [0001] The invention relates to a data-driven dynamic reactive power reserve demand evaluation method of a DC receiving end power grid, belonging to the technical field of power system operation control. Background technique [0002] In recent years, my country has put into operation a number of large-capacity long-distance power transmission projects, which have contributed to a number of typical sending-end power grids and receiving-end power grids. The receiving-end power grid needs to receive a large amount of electric energy from outside the area, and there are relatively few power generation equipment in the area, and the reactive power reserve is relatively lacking, so the problem of voltage stability is prominent. [0003] The problem of voltage stability in the DC receiving power grid is more severe. The voltage of the AC bus in the converter station on the DC inverter side can greatly affect the operating characteristics of the DC transmission line...
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IPC IPC(8): H02J3/36H02J3/18H02J3/16
CPCH02J3/16H02J3/18H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 黄志龙孙宏斌庄侃沁郭庆来陈浩王彬吴文传黄志光赵文禄时艳强汤磊丁浩寅
Owner EAST CHINA BRANCH OF STATE GRID CORP