Optimal transformation method for eliminating leverage points
An optimal transformation and leverage technology, which is applied in data processing applications, forecasting, instruments, etc., can solve the problems of poor tolerance and inability to effectively suppress bad data at leverage points, so as to eliminate leverage points, have good engineering application prospects, and suppress The effect of bad data
Inactive Publication Date: 2016-02-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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The above state estimation methods have a good ability to suppress general bad data, but when the equivalent measurement contains bad data of leverage points, the robustness of these state estimates is poor, that is, the existing state estimation methods cannot effectively suppress bad data of leverage points
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[0016] The embodiments will be described in detail below in conjunction with the accompanying drawings.
[0017] The present invention proposes an optimal transformation method for eliminating leverage points, such as figure 1 shown, including:
[0018] Step 1. Obtain the Jacobian matrix H of the power system state estimation through the measurement equation established by the power system parameter measurement; specifically, the measurement equation is z=h(x)+e, then the state estimation The Jacobian matrix of H∈R m×n ; where: z∈R m Vector measurement, including node voltage amplitude measurement, branch active power measurement, branch reactive power measurement, injected active power measurement, injected reactive power measurement, and branch current amplitude measurement; x∈R n is the state vector including the voltage amplitude and phase angle of all nodes, except the reference node phase angle, m is the number of measurement vectors, n is the number of state variab...
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The invention belongs to the technical field of power system automatic scheduling and particularly relates to an optimal transformation method for eliminating leverage points. The method comprises the steps of building a measurement equation on the basis of power system parameter measurement to calculate a Jacobian matrix H of power system state estimation; setting nodes with outgoing line degrees greater than 3 as leverage points, and marking the columns in the Jacobian matrix H corresponding to the nodes as columns in need of rotation if the nodes have node injection power measurement; calculating optimal rotation matrices corresponding to the columns in need of rotation, and multiplying the matrices to obtain an optimal rotation matrix Q of the Jacobian matrix; and obtaining an optimal expansion matrix S through solving an optimization problem, and performing the optimal transformation of the Jacobian matrix to obtain an optimal Jacobian matrix H' which equals SHQ. The method can effectively eliminate the leverage points, so that state estimation calculation thereafter can effectively inhibit poor data of the leverage points, and thus the method has good engineering application prospect.
Description
technical field [0001] The invention belongs to the technical field of power system automatic dispatching, and in particular relates to an optimal transformation method for eliminating leverage points (An optimal transformation method for eliminating leverage points, ELP-OT). Background technique [0002] Power system state estimation is the foundation and core of energy management systems. Now almost every large dispatch center has installed a state estimator, and state estimation has become the cornerstone of the safe operation of the power grid. Since state estimation was first proposed by foreign scholars in 1970, people have studied and applied state estimation for more than 40 years, and various state estimation methods have emerged during this period. [0003] At present, the most widely used state estimation at home and abroad is the weighted least squares method (Weighted least squares, WLS). The WLS model is simple and easy to solve, but its robustness is poor. ...
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IPC IPC(8): G06Q10/04G06Q50/06
Inventor 陈艳波颛孙旭晋文杰张籍陈茜马进陈意陶帅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)