Data-driven dynamic reactive power reserve assessment method for dc receiving-end power system
A data-driven technology for the receiving end power grid, applied in reactive power compensation, AC network circuits, AC network voltage adjustment, etc., can solve problems such as changes in reactive power reserve requirements, difficult to solve power grid reactive power reserve requirements, and difficult online analysis
Active Publication Date: 2018-12-18
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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[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 assessment method of a DC receiving end power network, belonging to the technical field of power system operation control.The invention utilizes an index to quantitatively evaluate the transient voltage stability in the vicinity of a DC inverter station, calculates the dynamic reactive power reserve requirement in the vicinity of the DC inverter station based on the numerical simulation iteration, and stores the calculation result and the characteristic quantity into an offline sample library. Aiming at the problem of on-line assessment of dynamic reactive power reserve in the vicinity of DC inverter station, a data mining model is constructed, and the model is trained based on offline sample set. A method of periodically updating the sample set is proposed to update the data mining model periodically. On-line dynamic reactive power reserve requirements can be quickly evaluated using data mining model based on online reading of operation mode data and extraction of online system characteristics.
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 serious. 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 lin...
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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