A system and method for evaluating node voltage stability based on local measurement vectors
A node voltage and stability evaluation technology, which is applied in the direction of power network operating system integration, AC network voltage adjustment, information technology support system, etc., can solve the problems of large amount of data, difficult coordination of calculation speed and calculation accuracy, and data transmission reliability issues such as guarantees
Inactive Publication Date: 2017-02-01
NORTHEASTERN UNIV LIAONING +2
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Problems solved by technology
These methods are based on the overall power system and need to obtain the data of all nodes in the system. The amount of data is large, so it is difficult to coordinate the contradiction between calculation speed and calculation accuracy, and it is difficult to guarantee the reliability of a large amount of data transmission.
The static voltage stability analysis method ignores the dynamic characteristics of the system components, and the solution speed is improved, but the accuracy is questioned; the dynamic voltage stability method takes the dynamic characteristics of the system components into account, and the solution speed is relatively slow, and the mathematics of various system components The model also needs to be developed; the analysis results of the time domain simulation method are accurate and reliable, but it takes a lot of time to repeatedly solve the differential algebraic equations
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[0057] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.
[0058] Such as figure 1 As shown, the node voltage stability evaluation system based on local measurement vectors includes a GPS receiving device, a data acquisition device, a communication device, and a voltage stability evaluation device. The device uses PCS-996A synchronous vector measuring device, the communication device uses PCS-9882 series switches, and the GPS receiving device uses RCS-9785 synchronous clock device and RCS-9884 photoelectric conversion module.
[0059] Its circuit schematic diagram is as figure 2 As shown, the DSP is externally connected with a memory chip IS61LV12816, and the reset and clock circuit principle is as follows image 3 As shown; pins 41, 17, and 6 of the output end of the memory are connected to pins 42, 84, and 133 of the DSP chip, and the memory stores various data calculated by the DSP; pin 7 of the output e...
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The present invention proposes a node voltage stability evaluation system and method based on local measurement vectors, which belongs to the technical field of voltage stability evaluation. The present invention measures synchronization vector data on local nodes of the system and based on Thevenin's theorem. The system is simplified into an equivalent two-node system including the target node, and a new voltage stability criterion is proposed. No assumptions are made about the load characteristics in the entire process. When the target node is overloaded, a voltage instability signal is sent out; Because only the data of some nodes of the power system are collected, the amount of calculation is reduced; because no assumptions are made about the compliance characteristics, the theoretical versatility and accuracy are guaranteed; both calculation speed and stability evaluation accuracy are taken into account to ensure stable node voltage of the system. Real-time online evaluation provides the possibility to take timely stabilization control measures based on real-time judgment results, which greatly helps to improve the safe and stable operation capability of the system.
Description
technical field [0001] The invention belongs to the technical field of voltage stability evaluation, and in particular relates to a node voltage stability evaluation system and method based on local measurement vectors. Background technique [0002] Since the 1920s, power system stability has been carefully studied as an important prerequisite for safe operation, but the research on power system voltage stability is one of the branches that develops slowly. Until the end of 1970s and the beginning of 1980s, due to successive occurrences of grid disconnection accidents characterized by voltage collapse of the interconnected grid, power system voltage stability began to be valued and studied as a special direction. [0003] In recent decades, experts at home and abroad have proposed a variety of voltage stability analysis methods, which can be divided into static voltage stability, dynamic voltage stability and time domain simulation analysis methods. The static voltage stabi...
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IPC IPC(8): H02J3/00G06F19/00
CPCH02J3/00H02J3/14H02J2203/20Y02B70/3225Y04S20/222
Inventor 杨珺王刚张化光张冠峰孙秋野姜凯高凯刘鑫蕊张艳军黄博南王迎春戈阳阳
Owner NORTHEASTERN UNIV LIAONING