The central energy-saving protection device of the smart grid solves the problem that the existing technology has a complicated circuit structure.
Central Grid Energy-Saving Protection Device
The central energy-saving protection device of the smart grid 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.
Figure 1 is a schematic view of the structure of the smart energy-saving protection device.
Figure 2 is a circuit diagram of a three-level IGBT inverter circuit of the present invention.
In the figure, 1, grid input line; 2, control circuit; 2a, harmonic detection module; 2b, adjustment and monitoring module; 3, drive circuit; 4, high-pass filter circuit; 5, three-level IGBT inverter circuit; GPRS signal generator; 7, RS485 communication interface; 8, power converter; 9, current transformer one; 10, current transformer two.
When the central energy-saving protection device of the smart grid is running, the current transformer 1 collects the current signal of the grid input line 1, and the current transformer 2 10 collects the current on the compensation line between the high-pass filter circuit 4 and the three-level IGBT inverter circuit 5. The signal, the control circuit 2 receives the signals transmitted by the current transformer 9 and the current transformer 2, and analyzes and calculates the positive sequence current, the negative sequence current, and the zero sequence current in the grid input line 1, 19 times or less. The magnitude and phase angle of the higher harmonic current, and then according to the current signal collected by the current transformer 2, control the on and off of the corresponding IGBT switch in the three-level IGBT inverter circuit 5, and send and negative to the grid input line 1 Sequence current, zero-sequence current, equal-order, lower-order currents of less than 19 times, offset the negative sequence current, zero-sequence current, high-order harmonic current in the grid, and produce an equal and opposite direction The zero line current is injected into the neutral line, so that only the three phases of the line are equal in magnitude, the positive phase current with the phase angle and the voltage phase angle is the same, and the high-pass filter circuit 4 works together. Under the use of the three-phase unbalanced control, reactive power compensation and high-order harmonic filtering function, in addition, the device is connected to the GPRS signal generator 6 through the RS485 communication interface 7, the user can download the exclusive APP through the mobile phone Or the computer realizes remote monitoring and control, which no longer uses large-capacity capacitors or inductors, but realizes compensation by high-frequency switch of high-power power electronic devices, with fast response, high compensation precision, good energy saving effect, and compensation capacity. Large, maximum 1000kvar, strong protection, long service life, simple structure, small footprint, no need for personnel to be on duty.
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