Comprehensive solution of power quality
With the development of China's national economy, the non-linear, asymmetric and impulsive loads in the power grid increase, which will have the following adverse effects:
1) The reactive and harmonic currents generated by nonlinear loads infiltrate into the power system in large quantities, which can not be treated for a long time and increases the system loss.
2) Rapid impact loads (such as rolling mills, welding machines, large punches, etc.) absorb reactive power from the grid, while generating voltage fluctuations and flickers, reducing the effective output of the motor, reducing the yield of products, shortening the life of equipment.
3) the unbalanced load aggravates the imbalance degree of the power grid.
In view of the above situation, InBev Electric took the lead in introducing GSVG dynamic filter compensation device, which combines advanced power electronics technology with traditional filter compensation methods, and has the following functions:
1) harmonic control function
A) 2-51 wide range filtering, and the removal rate is more than 95%.
B) neutrality elimination
2) reactive power compensation
A) bidirectional reactive power output
B) precision reactive power compensation
C) target power factor setting
D) capacitor state monitoring
3) balanced three-phase current
A) adjust the three-phase current of the system accurately.
B) reduce the neutral line running current
4) other functions
A) energy saving mode
B) timer switch machine
C) fault self recovery
D) over temperature capacity reduction function
Technical advantage
1) unified control
Active filter unit directly controls the switching of traditional filter compensation unit to avoid capacity hedging between them.
2) diverse combinations
Active power filter can be combined with common complement capacitor, tap capacitor (L-N, L-L) and intelligent capacitor for different working conditions.
3) high cost performance
The product makes full use of the economy of traditional filter compensation products and the advanced nature of power electronic products. The traditional filter compensation unit can roughly adjust the basic reactive power and absorb part of the harmonic. The active filter unit can fine compensate for the rapidly changing reactive power demand and harmonic current, and can also use the active filter single. The bidirectional regulation function of element reactive power can effectively control the situation of reactive power backward transmission and make up for the congenital deficiency of traditional filter compensation device.
4) low self wastage
Compared with pure power electronic solutions, GSVG products will replace most of the capacity with traditional filter compensation products, because the loss of traditional products is far lower than IGBT switching loss, active filter capacity accounted for a small proportion, the device loss is low.
5) high reliability.
GSVG products have advanced fault-tolerant operation function, that is, when one active filter unit or the traditional filter compensation unit fails to exit, the GSVG control system automatically shields the fault unit to ensure the normal operation of other normal units; at the same time, when the active filter unit shuts down due to transient fault, the traditional filter compensation unit can still be. Run independently.
Product mix:
1) active filter + complementary capacitor
The scheme is suitable for industrial loads with low power factor, serious harmonic pollution and basic balance of three-phase current. Traditional filter compensation unit compensates the basic reactive power of the system and absorbs a small amount of harmonic current. Active filter unit treats the harmonic current of the system, and the surplus capacity of active filter can change rapidly. The reactive power is linearly compensated to provide system power factor.
