Intelligent adjustment system and intelligent adjustment method for power system

Abstract

The invention discloses an intelligent adjustment system and an intelligent adjustment method for a power system. The intelligent adjustment system comprises a power quality acquisition unit, a host,an intelligent adjustment controller, a capacitor bank circuit breaker and a power capacitor bank. The power quality acquisition unit is used for acquiring power quality data and environment temperature and humidity data of a power system and sending the data to the host. The host is used for calculating and analyzing the electric energy quality data, judging the capacitance, reactance rate and switching-off and switching-on error time required by the power system and determining the switching-off and switching-on opportunity so as to send a corresponding adjustment instruction to the intelligent adjustment controller. The intelligent adjustment controller is used for controlling the power capacitor bank to adjust the capacitance and the reactance rate according to the adjustment instruction and carrying out switching-off and switching-on operation on the capacitor bank circuit breaker at preset time before the switching-off and switching-on opportunities according to the environment temperature and humidity. According to the invention, harmonic waves can be better suppressed, transient overvoltage can be suppressed, inrush current can be limited, and harmonic waves can be filtered, so that a power system is ensured, and safe and stable operation of a capacitor bank is protected.

Description

technical field [0001] The invention relates to the technical field of electric power system intelligent adjustment, in particular to an electric power system intelligent adjustment system and an intelligent adjustment method. Background technique [0002] In the current power system, the capacitance of the shunt capacitor bank and the reactance rate of the reactor are basically before the substation is put into operation, and the design unit refers to the reactive power compensation, harmonic , inrush current, etc. are calculated and then designed, produced, installed and put into operation. Because the theoretical calculation is often quite different from the actual situation on site, and after a period of operation, the nature of the load will also change greatly, especially harmonics. The actual situation on site is often far from the calculated value at the beginning of the design. Therefore, the fuses, capacitors, and reactors inside the parallel capacitor bank are of...

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Problems solved by technology

Because the theoretical calculation is often quite different from the actual situation on site, and after a period of operation, the nature of the load will also change greatly, especially harmonics. The actual situation on site is often far from the calculated value at the beginning of the design. Therefore, the fuses, capacitors, and reactors inside the parallel capacitor bank are often damaged, and what's more, the capacitor may explode, which seriously endangers the safe operation of the power grid and personal safety.

In addition, since the capacitance of the capacitor bank is fixed, it often occurs in the field that if one more capacitor is used, the reactive power compensation will be too much, and if one less capacitor is used, the reactive power compensation will be insufficient.

Furthermore, in the current AVC system, the opening and closing time points of the circuit breaker are random, which will lead to closing inrush current when closing, and transient overvoltage when opening, which will damage the power equipment in severe cases.

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