Smart Grid Energy-Saving Protection Device

The smart grid central energy-saving protection device solves the problem that the existing technology has a complicated circuit structure.

Product Details

Smart Grid Energy-Saving Protection Device

  The smart grid central energy-saving protection device solves the problem that the existing technology has a complicated circuit structure. The central energy-saving protection device of the smart grid comprises a control circuit, a power grid input line, a drive circuit connected to the control circuit, a current transformer connected to the control circuit, a high-pass filter circuit connected to the grid input line, and three connected to the high-pass filter circuit. The level IGBT inverter circuit, the high-pass filter circuit and the three-level IGBT inverter circuit are connected with a current transformer 2, the current transformer 2 is connected with the control circuit, and the three-level IGBT inverter circuit is connected with the control circuit through the driving circuit. The control circuit outputs a control signal according to the signal detected by the current transformer 1 and the current transformer 2 to control the breaking of the three-level IGBT inverter circuit. The central energy-saving protection device of the smart grid can realize three-phase unbalanced treatment while simplifying the circuit structure. 


智能电网中央节能保护装置


[Technical Protection Point]

At present, the main power supply mode of the low-voltage distribution network is three-phase four-wire system. Most of the power equipment in the distribution network is single-phase load or single-phase or three-phase hybrid load. Due to the different timeliness of the power equipment, the transformer is almost running. In the three-phase unbalanced state, the danger of three-phase unbalance, the hazard of low power factor and the hazard of higher harmonics cannot be avoided without adding equipment. When the three-phase current is unbalanced, the neutral point drifts and the zero-sequence current of the neutral line increases. The neutral point drift will produce an imbalance of the three-phase voltage. Generally, the phase voltage of the low current is high, and the severe phase voltage will reach 380V. It causes the burning of transformers and electrical equipment, threatening the safety of life. The drift of the neutral point will also reduce the power factor of the transformer, reduce the efficiency of the transformer, increase the loss of the transformer and the line, and shorten the service life of the transformer. In view of the above problems, the existing Chinese patent document discloses a low-voltage distribution network power quality optimization energy-saving device [application number: CN201720253551.8], and has a TSC-type capacitive reactive power compensation circuit, which is supplemented by power Capacitor and sub-compensated power capacitor are composed and connected to the distribution network through a thyristor switch to output capacitive reactive power compensation current to the distribution network; SVG type static var generator circuit is also provided, and the circuit is powered by IGBT a self-commutated bridge circuit composed of cells, and connected to the power distribution network through a reactor, and outputs a capacitive to SVG type static var generator current capable of infinitely adjusting to the power grid; and is provided with a controller and a driving circuit; The controller uniformly detects and calculates the operation of the power grid, and drives the two power compensation circuits through the drive circuit to output corresponding compensation currents to the distribution network. Although the technology governs the three-phase unbalance, low voltage and reactive power compensation of the power grid, the technology needs to drive two power compensation circuits to output corresponding compensation currents to the distribution network, so that the above problem can be solved, and the circuit structure is complicated.


[Technical Protection Point]

A smart grid central energy saving protection device includes a control circuit, a grid input line for inputting grid power to a user load, a drive circuit connected to the control circuit, and a current connected to the control circuit for detecting an input line of the power grid a current transformer of the signal, characterized in that the smart grid central energy saving protection device further comprises a high-pass filter circuit connected to the grid input line and a three-level IGBT inverter circuit connected to the high-pass filter circuit, A current transformer 2 is connected between the high-pass filter circuit and the three-level IGBT inverter circuit, and the current transformer 2 is connected to the control circuit, and the three-level IGBT inverter circuit is connected to the control circuit through the driving circuit. The control circuit outputs a control signal according to the signal detected by the current transformer 1 and the current transformer 2, and controls the breaking of the three-level IGBT inverter circuit, so that the grid input line generates a positive sequence current with a phase angle and a voltage phase angle.





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