A Power System Simplified Equivalence Method Based on Dynamic Characteristic Analysis of Generator Group
A dynamic feature, power system technology, applied in system integration technology, information technology support system, electrical components, etc., can solve the problems of fuzzy coherence identification process, inability to apply equivalent calculation, affecting modeling accuracy, etc., to meet online stability performance analysis and operation control, accurate dynamic response results, and improved computing efficiency
Active Publication Date: 2021-07-20
LIYANG RES INST OF SOUTHEAST UNIV +1
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[0005] Type 1 linearizes the system at the basic operating point. When a large disturbance occurs in the system and the network topology changes, the identification results of the unit before and after the fault will be quite different; Type 2 identifies the coherent unit through offline dynamic simulation , this type of method is usually more reliable and can obtain a high simplification ratio, but it cannot be applied to online equivalent calculation; the third type relies on advanced hardware equipment, including synchronous vector measurement unit, broadband communication, parallel computing equipment, etc. According to real-time Online calculation of measurement data
[0006] Although the coherence equivalent method can obtain satisfactory results for most units operating in the local oscillation mode, the coherence identification process will be blurred when the system has multiple interval oscillation modes, which will affect the accuracy of the modeling, and most Coherent Equivalence Method Fails to Consider Generator Voltage Fluctuation
[0007] At present, the research on online equivalent modeling of large-scale power systems based on measurement data is almost blank, and most of the existing methods are also based on the framework of the coherent equivalent method, which cannot overcome its inherent defects, and related research is urgently needed
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[0038] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.
[0039] Such as figure 1 As shown, a power system simplified equivalent method based on generator group dynamic feature extraction, attribution and reconstruction includes the following steps:
[0040] S1: Establish a dynamic model of the power system with multiple generating units;
[0041] S2: Use the synchrophasor measurement unit (PMU) to record the dynamic time series of the rotor angle of each generator set in the system after being disturbed;
[0042] S3: According to the dynamic characteristics of each generator after disturbance, use the singular value decomposition (SVD) algorithm to find the optimal orthogonal basis representing the dynamic response process, and realize the dynamic feature extraction of the system;
[0043] S4: Match the optimal orthogonal basis vector found in step S3 feature extraction with the dynamic response vect...
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The invention provides a simplified equivalent method of power system based on generator group dynamics, which includes the following steps: establishing a dynamic model of the power system; recording the dynamic time series of rotor angles of each generator set in the system after being disturbed; The optimal orthogonal basis is used to realize the dynamic feature extraction of the system; the optimal orthogonal basis vector is matched with the dynamic response vectors of each generator set in the system to determine the characteristic generator set; it is obtained under different operating scenarios and disturbances The characteristic generator sets of the system are combined to obtain the common characteristic generator sets of the system; the dynamic equivalent simplification of the system model is realized. Based on the PMU measurement data, the present invention performs dynamic feature extraction, attribution and reconstruction of units in the power system, realizes dimensionality reduction and simplification of the model, improves the calculation efficiency of power grid dynamic simulation, and can meet the needs of power system online stability analysis and analysis. The need for operational control.
Description
technical field [0001] The invention relates to the technical field of dynamic modeling and simulation of power systems, in particular to a power system simplification equivalent method based on dynamic feature extraction, attribution and reconstruction of generator groups. Background technique [0002] With the initial formation of the national network and the large-scale optimal allocation of energy resources, the acceleration of new energy development, and the steady advancement of power market reforms, the scale of grid organization and the complexity and dimension of grid structure have also increased significantly. For such a complex and high-dimensional coupled large-scale network, how to obtain its dynamic operation information in real time and accurately to ensure the safe and economic operation of the power grid is of great significance and arduous task. [0003] The dynamic simplified equivalent modeling of large-scale interconnected grids can greatly reduce the c...
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IPC IPC(8): H02J3/00G06F17/13G06F17/16
CPCY02E40/70Y02E60/00Y04S10/22
Inventor黄煜徐青山
OwnerLIYANG RES INST OF SOUTHEAST UNIV