Three-phase unbalanced solution


Smart Power Quality Correct Device SPC

SPCSmart Power Quality Correct DeviceIt is a new type of power electronic device that is optimized and upgraded on the basis of SVG and is dedicated to improving the power quality of the power distribution area. The device can effectively compensate the three-phase unbalance, quickly adjust the reactive power in two directions, and stabilize the system voltage in real time. It is in complete agreement with the management policy and technical principles of the “low voltage” of the State Grid. With the addition of the STS series,SPC can significantly improve the power quality of the station area, which has the following aspects: Completely solve the three-phase imbalance problem of the distribution network and greatly reduce the line loss of the low-voltage distribution networkReactive power reaches local balance and increases output capacityImprove voltage quality in real time, stabilize system voltage, improve distribution quality, and improve power environmentPerfectly solve the problem of transformer overload operation caused by three-phase unbalance, and extend the life of the transformer

Smart Power Quality Correct Device SPC

SPCSmart Power Quality Correct DeviceIt is a new type of power electronic device that is optimized and upgraded on the basis of SVG and is dedicated to improving the power quality of the power distribution area. The device can effectively compensate the three-phase unbalance, quickly adjust the reactive power in two directions, and stabilize the system voltage in real time. It is in complete agreement with the management policy and technical principles of the “low voltage” of the State Grid. With the addition of the STS series,SPC can significantly improve the power quality of the station area, which has the following aspects: Completely solve the three-phase imbalance problem of the distribution network and greatly reduce the line loss of the low-voltage distribution networkReactive power reaches local balance and increases output capacityImprove voltage quality in real time, stabilize system voltage, improve distribution quality, and improve power environmentPerfectly solve the problem of transformer overload operation caused by three-phase unbalance, and extend the life of the transformer

PRODUCT

Reactor
Filter
Transformer
Power quality inspection
Reactive power compensation
Active filter
The integrated solutions for improving power quality
Customization

Principle of compensation for three-phase unbalance

After the SPC is turned on, the system current is detected in real time through an external current transformer (CT), and the information is sent to the internal controller for analysis to determine whether the system is in an unbalanced state. At the same time, the current value in the equilibrium state is calculated, and then the signal is sent to the internal IGBT, so the unbalanced current is transferred from the phase with a large current to the phase with a small current, and finally reaches the three-phase equilibrium state.

 

Principle of voltage support

The SPC samples the compensation point voltage and transmits the voltage information to the internal DSP to determine whether the compensation point voltage exceeds the set value.When the voltage exceeds the upper limit (Umax), the SPC outputs an inductive current, which reduces the voltage; when the voltage is lower than the lower limit (Umin), the SPC outputs a capacitive current and boosts the voltage. Finally, the phase voltages are stabilized within the normal range.

 

 

Principle of compensation for three-phase unbalance

After the SPC is turned on, the system current is detected in real time through an external current transformer (CT), and the information is sent to the internal controller for analysis to determine whether the system is in an unbalanced state. At the same time, the current value in the equilibrium state is calculated, and then the signal is sent to the internal IGBT, so the unbalanced current is transferred from the phase with a large current to the phase with a small current, and finally reaches the three-phase equilibrium state.

 

Principle of voltage support

The SPC samples the compensation point voltage and transmits the voltage information to the internal DSP to determine whether the compensation point voltage exceeds the set value.When the voltage exceeds the upper limit (Umax), the SPC outputs an inductive current, which reduces the voltage; when the voltage is lower than the lower limit (Umin), the SPC outputs a capacitive current and boosts the voltage. Finally, the phase voltages are stabilized within the normal range.

 

 

Energy Feedback Reactor

Reference / Implementing Standards GB1094.6-2011 Electric transformer JB9644-1999 Semiconductor electric drive reactor IEEE519 - 1992/EN6100-5-2

Harmonic filter

Reference/ lmplementing Standards IEEE519(EN - 2-5) Electromagnetic Magnetic Compatibility(EMC) EN61558-2-20 (VDE 507-2-20) Safety of Power Supply Equipment and Similar Equipment GB145493-93 Power Quality Public Power Grid Harmonic Wave

LCL filter

Reference/ lmplementing Standards GB 1094.6-2011 Reactor GB 1094.6-2011 Reactor (eqvlEC289:1987) JB 9644-1999 semiconductor electric drive reactor IEEE519-1992 GBT14549-93

EMI filter

Please see the details

Output Reactor

It is installed at the output end of the inverter, which is used to limit the capacitive charging current of the inverter and the motor connecting cable, and inactivate the voltage rise rate of PWM wave output by the inverter. When the length of motor cable exceeds a certain value, it is recommended to insert a motor reactor between the inverter and the motor, which is used to compensate the recharging current of capacitor in case of the long wires. The maximum length depends on the rated value of the frequency converter and the type of the motor cable.

Input Reactor

The input reactor can be used to provide improved overload protection for the line power supply, and to reduce the current harmonic distortion produced by the inverter. Increase the power factor of input power supply, reduce the high harmonic, and restrain the surge of frequency converter in the power supply equipment

Isolation transformer

The SG series three-phase dry-type isolation transformer is a new generation of energy-saving dry-type transformers developed and produced by our company on the basis of reference to similar international products and combined with applications. From...

DC Smoothing Reactor

DC smoothing reactor is used in the rectifying circuit to restrain the ripple pulse component after rectification and make the rectified current continuous, so as to improve the output branch waveform and guarantee the normal operation of DC equipment. The smoothing reactor is used as the series reactor in DC machine supplied by the converter, in order to eliminate the DC link in the current and voltage DC link converter; It is supposed to decouple the converter components on DC side. The power converter on DC side has high pulse circuit feedback to reduce the difference value limit, so as to limit the ring current on the connection with ring current, at the same time, limit the the rising rate of current. The smoothing reactor adopts the iron core of TEM and TET or TPK air core reactor, depending on the requirements on electromagnetic induction.

Sine wave filter

Reference / lmplementing Standards: IEEE519(EN61000-5-2) Electromagnetic compatibility (EMC) EN 61558-2-20(VDE507-2-20) Safety of power supply equipment and similar equipment GB 145493-93 Power quality, utility grid harmonics

Dv/dt filter

Reference / Implementing Standards: IEC60076-6:2007 Reactor GB1094.6-2011 Reactor (eqvIEC289:1987) JB9644-1999 Semiconductor electric drive reactor

Energy Feedback Reactor

Reference / Implementing Standards GB1094.6-2011 Electric transformer JB9644-1999 Semiconductor electric drive reactor IEEE519 - 1992/EN6100-5-2

Harmonic filter

Reference/ lmplementing Standards IEEE519(EN - 2-5) Electromagnetic Magnetic Compatibility(EMC) EN61558-2-20 (VDE 507-2-20) Safety of Power Supply Equipment and Similar Equipment GB145493-93 Power Quality Public Power Grid Harmonic Wave

LCL filter

Reference/ lmplementing Standards GB 1094.6-2011 Reactor GB 1094.6-2011 Reactor (eqvlEC289:1987) JB 9644-1999 semiconductor electric drive reactor IEEE519-1992 GBT14549-93

EMI filter

Please see the details

Output Reactor

It is installed at the output end of the inverter, which is used to limit the capacitive charging current of the inverter and the motor connecting cable, and inactivate the voltage rise rate of PWM wave output by the inverter. When the length of motor cable exceeds a certain value, it is recommended to insert a motor reactor between the inverter and the motor, which is used to compensate the recharging current of capacitor in case of the long wires. The maximum length depends on the rated value of the frequency converter and the type of the motor cable.

Input Reactor

The input reactor can be used to provide improved overload protection for the line power supply, and to reduce the current harmonic distortion produced by the inverter. Increase the power factor of input power supply, reduce the high harmonic, and restrain the surge of frequency converter in the power supply equipment

Isolation transformer

The SG series three-phase dry-type isolation transformer is a new generation of energy-saving dry-type transformers developed and produced by our company on the basis of reference to similar international products and combined with applications. From...

DC Smoothing Reactor

DC smoothing reactor is used in the rectifying circuit to restrain the ripple pulse component after rectification and make the rectified current continuous, so as to improve the output branch waveform and guarantee the normal operation of DC equipment. The smoothing reactor is used as the series reactor in DC machine supplied by the converter, in order to eliminate the DC link in the current and voltage DC link converter; It is supposed to decouple the converter components on DC side. The power converter on DC side has high pulse circuit feedback to reduce the difference value limit, so as to limit the ring current on the connection with ring current, at the same time, limit the the rising rate of current. The smoothing reactor adopts the iron core of TEM and TET or TPK air core reactor, depending on the requirements on electromagnetic induction.


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