Additional pmu optimal configuration method based on topological model and singular value decomposition
A technology of singular value decomposition and topology model, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve problems such as unobservable and no longer unobservable nodes
Active Publication Date: 2018-05-22
UNIV OF JINAN
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However, during operation, due to actual needs, some nodes are installed with generators or loads, and some nodes become unobservable due to the lack of zero injection conditions, or the topology model changes so that some nodes are no longer unobservable
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[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] 1 Observability analysis of the system
[0030] For a system, if the voltage phasor of a node can be obtained by direct measurement or calculation, the node is said to be appreciable. At present, there are two main methods for the analysis of observability, one is numerical analysis method and the other is topological analysis method. The numerical analysis method is to judge the observability of the system by judging the rank of the Jacobian matrix or the gain matrix. Due to the large computational complexity of this method, the method of topology analysis is usually used. Based on the topology analysis of the system and considering the influence of zero injection nodes, the following rules can be obtained:
[0031] 1) If a PMU is installed on the node, the node on which the PMU is installed and all nodes connected to it are observable.
[003...
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The invention discloses an extra phasor measurement unit (PMU) optimal configuration method based on a topological model and singular value decomposition. In situations that a zero injection condition lacks and a system model changes, the extra PMU optimal configuration method comprises the following steps of 1, building an equation between quantity measurement and state quantity on the basis of original configuration, and judging whether a matrix is in full rank or not; 2, acquiring a inconsiderable node by means of the singular value decomposition if the matrix is not in full rank; 3, separately configuring PMU according to the condition whether a common connection point exists in the inconsiderable node or not; and 4, acquiring all extra configuration until no inconsiderable node is generated. The inconsiderable node is acquired by means of the singular value decomposition, complicated topological analysis is avoided, meanwhile, only the inconsiderable node is considered, the number of node analysis is reduced, the configuration flexibility is also improved, the configuration redundancy is improved, and the configuration speed is increased.
Description
technical field [0001] The present invention relates to an additional PMU optimal configuration method based on topology model and singular value decomposition. Background technique [0002] As a means of real-time data processing in modern computers, state estimation plays an important role in improving data accuracy, detecting and identifying bad data, and identifying wire connections, providing a guarantee for the safe and economical operation of power systems. But the implementation of state estimation requires measurements that make the entire system fully observable. Although the traditional energy management system (EMS) can provide the necessary measurement data for state estimation, it cannot monitor the dynamic behavior of the system in real time. The safe operation of the system creates favorable conditions. Compared with the EMS system, the PMU can measure the node voltage phasor at the installation node and the current phasor of all branches connected to it, a...
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Login to View More IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 程新功王洪玉李石清张静亮殷文月
Owner UNIV OF JINAN