A parallel capacitor monitoring system and method thereof
A monitoring system and capacitor technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of high cost, complicated protection design and setting, etc., and achieve the effect of easy maintenance, high universality, and improved reliability.
Inactive Publication Date: 2019-11-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0003] The existing monitoring and protection technologies for shunt capacitors are mainly divided into two categories: one is to study protection configurations for different capacities and voltage levels. This type of method has perfect protection configurations, but the protection design and setting are more complicated and costly. Special research is carried out according to the actual working conditions of the system. This method is more suitable for the protection of high-voltage, large-capacity shunt capacitors; another type of research method uses the development of smart substations to realize the monitoring function of shunt capacitors. For example, relevant scholars put forward An online monitoring system based on the SCADA system, the method obtains bus voltage and capacitor current data from the SCADA system, and uses the voltage and current data to realize real-time early warning of the capacitance value
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[0043] The invention proposes a parallel capacitor monitoring system and a method thereof. figure 1 It is the structural diagram of the parallel capacitor monitoring system based on the equivalence balance equation provided by the present invention, such as figure 1 As shown, the system includes a data collection module, a parallel capacitor basic equation construction and calculation module, a logic information judgment module and a result output module;
[0044] The data acquisition module is used to collect the bus voltage of the parallel three-phase capacitor, the current of the three-phase capacitor, and the equivalent three-phase impedance value, and send the data to the basic equation construction and calculation module of the parallel capacitor. The data in the equivalent circuit diagram are as follows: figure 2 shown.
[0045] The basic equation construction and calculation module of shunt capacitors is used to construct the basic equations of shunt capacitors consi...
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The invention belongs to the technical field for electric power system's capacitor protection, and more particularly, to a parallel capacitor monitoring system and a method thereof. The system comprises the following elements in sequential connection: a data acquiring module, a parallel capacitor basic equation constructing and calculating module, a logic information determining module and a result outputting module. The method comprises: constructing a parallel capacitor basic equation in consideration of the running characteristics of the capacitor; solving the equilibrium equation by the symmetrical rotation of the branch parameters and selecting a group with the largest change amount in the initial capacitance value as a positive solution; comparing the calculated capacitance values of three phases with the rated value; and in combination with the parallel capacitor group state repair testing procedure stipulations, introducing external fault criteria to determine whether the a fault occurs to the capacitor or not and outputting the result. According to the invention, it is possible to accurately make warnings on a phase capacitor with fault without being influenced by initial parameter deviation and external fault, therefore, making the operation of a parallel capacitor more reliable.
Description
technical field [0001] The invention belongs to the technical field of electric power system capacitor protection, and in particular relates to a parallel capacitor monitoring system and a method thereof. Background technique [0002] As a reactive power source, the shunt capacitor can adjust the system voltage and improve the power quality. In recent years, the parallel capacitor bank and its reactive power compensation device often have capacitor damage in daily operation, the failure rate of capacitor devices is high, and group explosion and group damage failures have occurred many times, resulting in obvious fluctuations in grid voltage, active power and reactive power. The loss increases, the service life of the capacitor decreases, and the safe operation of the power grid is affected. In order to improve the operating reliability of shunt capacitors, it is necessary to conduct in-depth research on the monitoring and protection technology of shunt capacitors. [0003]...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王增平林一峰马静王桐孙吕祎
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)