A parameter online identification method for reactive power compensation capacitor bank
A technology for compensating capacitors and identification methods, which is applied to instruments, measuring electrical variables, measuring resistance/reactance/impedance, etc.
Inactive Publication Date: 2016-06-08
河北众科电力科技有限公司
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Problems solved by technology
At present, there is also a special power capacitor capacitance tester, which does not need to remove the connecting wire of the capacitor when measuring, but it also needs to be tested with a power failure and a signal.
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[0033] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0034] The principle of capacitor bank parameter identification is as follows:
[0035] right figure 1 In the circuit shown in (a), the three-phase voltage and three-phase current can be measured through the bus voltage transformer (PT) and the current transformer (CT) of the reactive power compensation capacitor circuit, and the three-phase can be obtained by Fourier transforming the signal The fundamental wave and harmonic phasors of voltage and current can be analyzed by the symmetrical component method for three-phase signals, and positive sequence, negative sequence and zero sequence quantities can be obtained. The fundamental wave signal is mainly positive sequence, and the positive sequence component is select...
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The invention discloses an on-line parameter identification method of a reactive power compensation capacitor bank in the technical field of on-line monitoring of power components. Including: measuring the three-phase voltage and three-phase current of the reactive power compensation capacitor bank at different times; processing the data to obtain the sequence components of the three-phase voltage fundamental wave phasor and current fundamental wave phasor of the reactive power compensation capacitor bank at each time moment, and the three-phase The sequence components of each harmonic phasor of the phase voltage and each harmonic phasor of the current; select the positive sequence component of the fundamental voltage phasor of any one phase at each time and the positive sequence component of the fundamental phasor of the same phase current, The sequence components with large content in each harmonic phasor of phase voltage and the sequence components with large content in each harmonic phasor of the same phase current; use the selected data to calculate the equivalent resistance value and capacitance value of reactive power compensation capacitor bank and the inductance value of the reactor. The invention realizes the on-line identification of the parameters of the capacitor bank without stopping the capacitor and removing the connecting wire of the capacitor, and reduces the measurement workload.
Description
technical field [0001] The invention belongs to the technical field of on-line monitoring of electric power components in a power system, and in particular relates to an on-line parameter identification method of a reactive power compensation capacitor bank. Background technique [0002] The power system provides reactive power compensation to the system through parallel capacitor banks to increase node voltage and reduce line loss. At the same time, in order to limit the closing inrush current and play a certain role in filtering harmonics, a reactor with a certain reactance rate is often connected in series in the capacitor bank. Such as figure 1 As shown, three-phase parallel capacitor banks connected in star connection and delta connection respectively. [0003] The normal operation of the capacitor bank is very important to the safety and stability of the power system. Therefore, it is generally arranged to carry out preventive tests every year to check whether the pa...
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IPC IPC(8): G01R27/08G01R27/26
Inventor 牛胜锁梁志瑞苏海锋赵飞王慧娟
Owner 河北众科电力科技有限公司