Multifunctional intelligent device for compensating reactive power and adjusting active power

Abstract

The invention discloses a multifunctional intelligent device for compensating reactive power and adjusting active power. The multifunctional intelligent device at least comprises a three-phase current sampling circuit and a three-phase voltage sampling circuit of a three-phase electric power system, and a power controller and a three-phase electric power compensation unit, wherein the three-phase electric power compensation unit is controlled by the power controller and comprises three changeover switches. The multifunctional intelligent device is characterized in that the power controller is used for respectively controlling each changeover switch and other single-phase switches in a three-phase unrelated compensation unit of the electric power system according to a sampling result, so that not only can the common compensation be realized, but also the single compensation can be realized; and not only can the reactive power be compensated, but also the active power can be balanced, and the arc light is greatly reduced by detecting voltage on two ends of a hurl-slices switch and setting a discharging circuit. By detecting the current inside the detecting device, the electricity leakage and the fault arc light of the device can be monitored. The multifunctional intelligent device is particularly suitable for the field with large imbalance degree of the three-phase load, and the imbalance problem of the active power can be solved while the reactive power is compensated.

Description

technical field [0001] The invention relates to the field of three-phase power unbalance compensation and reactive power compensation of electric power system. It particularly relates to the field of surge-free switching of reactive power compensation devices. Background technique [0002] Most of the reactive power compensation modules in the prior art have phase-separated reactive power compensation devices that can only compensate reactive power and cannot balance active power. , the name is "Phase-Split Grading Reactive Power Compensation Control Device", the Chinese patent number is 98237745.2, the name is "high-efficiency phase-controlled automatic reactive power compensation device", the Chinese patent number is 02256020.3, and the name is "Intelligent Phase-Split Capacitance Compensation Power distribution device", the application number is 03133841.0, the name is "fast-tracking low-voltage reactive power compensation device", the application number is 00100589.8, ...

AI Technical Summary

Problems solved by technology

[0002] Most of the reactive power compensation modules in the prior art have phase-separated reactive power compensation devices that can only compensate reactive power and cannot balance active power. , the name is "Phase-Split Grading Reactive Power Compensation Control Device", the Chinese patent number is 98237745.2, the name is "high-efficiency phase-controlled automatic reactive power compensation device", the Chinese patent number is 02256020.3, and the name is "Intelligent Phase-Split Capacitance Compensation Power distribution device", the application number is 03133841.0, the name is "fast-tracking low-voltage reactive power compensation device", the application number is 00100589.8, the name is "automatic non-contact switching reactive power compensation device", the application number is 02139174.2, the name "Dynamic reactive power compensation method and device", etc. Although these methods and devices can compensate reactive power, they cannot balance active power. The problem

Although there is a method that can adjust the three-phase unbalanced current and compensate reactive power at the same time, the Chinese patent number is 00110110.2, and the name is "power factor compensation device that can correct the three-phase unbalanced current", and the Chinese patent number is 200920012159. X, the name is "synchronous marshalling switch", in these schemes, the switching switch is multi-line complicated, the cost is high and the reliability is poor; the Chinese patent number is 200510045751.6, and the name is "Efficiently Compensating Three-phase Unbalanced Load and Reactive Power Device" Although The circuit is simple, but there are shortcomings such as overvoltage when the capacitor is switched on, overcurrent when the capacitor is cut off, and low utilization of the capacitor.

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