Power grid load flow calculation method based on admittance matrix quick fix
An admittance matrix, power grid technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as large amount of calculation, slow update speed of power grid flow, uncontrollable provision of basic data of power grid, etc. The effect of enhancing stability
Inactive Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +3
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However, with the acceleration of China's power grid construction, the scale of the power grid is increasing day by day, and the structure of the power grid is becoming more and more complex. The matrix dimension of the admittance matrix of the power grid becomes very large, and the operation required for the factorization of the revised admittance matrix is re-factored. The large amount occupies most of the calculation time of the grid power flow algorithm, which leads to the slow update speed of the grid power flow after the power equipment trips due to a fault, and cannot provide real-time grid basic data for the stability analysis and control of the power system, which brings huge security risks to the safe and stable operation of the grid
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[0016] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0017] This example figure 1 As shown, the existing wide-area measurement system of the power grid is used to realize the synchronous measurement of the voltage and current phasors of each substation in the power grid, and obtain the synchronous data of the power grid in real time. If the circuit breakers at both ends of the line ij are tripped, calculate the intermediate matrix W=Y- 1 M; where Y is the grid node admittance matrix; M=[0 ... 1 ... -1 ... 0] T It is an n×1 dimensional matrix, the element in row i, column 1 in M matrix is 1, the element in row j, column 1 in M matrix is -1, and other elements are 0; i=1,...,n; j=1 ,...,n; n is the total number of grid substations; line ij connects substation i and substation j.
[0018] Calculate variable matrix Among them, E is n×n order unit matrix; J=[0 ... -y ij … y ij ... 0] is...
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The invention relates to a power grid load flow calculation method based on admittance matrix quick fix. The calculation method includes the steps that voltage phasors and current phasors of all transformer substations of a power grid are measured synchronously to obtain synchronous data of the power grid by using an existing wide-area measurement system of the power grid; if a single line of the power grid trips, a middle matrix and a variable matrix are calculated through low-dimensionality matrix inversion, voltage variable quantities of all the transformer substations of the power grid after the line trips are calculated, current variable quantities of all lines of the power grid after the line trips are calculated, and the calculated current variable quantities of all the lines of the power grid and currents of all the lines of the power grid before the line trips are superposed to obtain currents flowing through all the lines of the power grid after the line trips. The power grid load flow calculation method is high in calculation speed, the whole calculation process can be finished within 200 ms, real-time essential data of the power grid can be provided for analysis and control over power system stability, and stability of safety operation of the power grid is enhanced.
Description
technical field [0001] The invention relates to the technical field of power system steady-state analysis, in particular to a grid power flow calculation method based on rapid correction of an admittance matrix. Background technique [0002] Grid power flow calculation is an important part of power system steady-state analysis. Accurate and fast calculation of grid power flow can provide comprehensive current flow direction and current magnitude information for power dispatching, and implement power grid generator output for peak regulation, frequency regulation, and prevention of electrical equipment overload. and load sizing to provide the underlying data. At present, the grid power flow calculation method mainly corrects the original admittance matrix, re-decomposes the factor table of the revised admittance matrix, and then uses the factor table to update the grid power flow calculation. The calculation speed of this method can meet the needs of the grid when the scale ...
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Inventor 曾惠敏
Owner STATE GRID CORP OF CHINA