Initialization method for electromechanical transient simulation of a power system
An initialization method and transient simulation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as no research reports, achieve strong practicability, and avoid adverse effects.
Inactive Publication Date: 2019-05-24
NANJING INST OF TECH
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However, there have been no relevant research reports on the micro error introduced in the process of initializing the component model using the power flow calculation results
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[0040] Such as figure 1 As shown, in this embodiment, an initialization method for electromechanical transient simulation of a power system includes the following steps:
[0041] Step 1. Construct the original system admittance matrix Y1 according to the power system model, and the original system admittance matrix Y1 includes all balance nodes in the power system power flow model;
[0042] Step 2. Convert all passive static components into equivalent admittances according to the power flow calculation results and add them to the original system admittance matrix Y1 to obtain an updated system admittance matrix Y2;
[0043] Step 3. Multiply the updated system admittance matrix Y2 with the node voltage vector V1 in the power flow calculation results to obtain the node injection current vector I1=Y2*V1, which will correspond to the node that is not connected to any dynamic components or active static The injection current of the component node is cleared, so as to obtain the up...
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The invention discloses an initialization method for electromechanical transient simulation of a power system. The method mainly comprises the following steps: in a time domain, firstly, converting all passive static elements into equivalent admittance according to a power flow calculation result, adding the equivalent admittance into a system admittance matrix, then multiplying the updated systemadmittance matrix by a node voltage vector in the power flow calculation result to obtain a node injection current vector, and updating an initial node voltage vector of electromechanical transient simulation; and in the frequency domain, adding sine wave test signals, carrying out frequency characteristic measurement on the received signals, acquiring a transfer function through a special fitting program, and then carrying out final actual measurement characteristic comparison, so that initialization updating is carried out. The method not only can completely avoid the adverse effect of theaccumulation effect of micro iteration errors in the power flow calculation result on the accuracy of the electromechanical transient simulation result, but also has the advantage of being capable offlexibly expanding various complex dynamic element models.
Description
technical field [0001] The invention relates to an electromechanical transient simulation technology, in particular to an initialization method for electromechanical transient simulation of a power system. Background technique [0002] The electromechanical transient simulation of power system is to use the numerical integration method to solve the initial value of the disturbed motion differential equations describing the power system, and then use the change of the relative angle between the rotors of each generator to judge the stability of the system. Because the numerical integration method used in electromechanical transient simulation can adapt to various component mathematical models with different levels of detail, it has been widely used in practice and has been used as a standard method to examine the correctness and accuracy of other analysis methods. At present, the electromechanical transient simulation of power system using the numerical integration method is ...
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IPC IPC(8): G06F17/50
Inventor 董亮沈钦寅柏雨昕刘海涛郝思鹏张东东宁佳
Owner NANJING INST OF TECH