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ភພາສາລາວ

ព្រះរាជាណាចក្រកម្ពុ

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Overall Power Quality Solution

With the development of China's national economy, the non-linear, asymmetric and impact load in the power grid will increase, which will have the following adverse effects:

1. The reactive and harmonic currents generated by nonlinear loads penetrate into the power system in large quantities, and cannot be treated for a long time, which increases the loss of the system.

2. Rapid impact load (such as rolling mill, welding machine, large punch, etc.) from the power grid to absorb reactive power, while generating voltage fluctuations and flicker, reduce the effective output of the motor, so that the product yield is reduced, shorten the service life of equipment.

3. Asymmetric load exacerbates the imbalance of the grid.

In view of the above situation, Changsha Hengkai Electrical Equipment Co., Ltd. has launched HK-ASVG intelligent integrated filter compensation device, which combines advanced power electronic technology with traditional filter compensation methods and has the following functions:

Harmonic control function:

2-51 wide range filtering, filtering rate ≥ 95%;

Neutral line harmonic elimination;

Balanced three-phase current:

· Precisely adjust the three-phase current of the system;

Reduce the running current of the neutral line;

Reactive compensation:

· Bidirectional reactive power output;

Accurate reactive power compensation;

· Target power factor setting;

• Condition monitoring of capacitors;

Other functions:

Energy-saving working mode;

· Time switch machine;

· Fault self-recovery;

· Over-temperature and capacity reduction function;

The HK-ASVG intelligent integrated filter compensation device has the following technical advantages:

1. Unified control:

The active filter unit directly controls the switching of the traditional filter compensation unit to avoid capacity hedging between the two.

2. Various combinations:

For different working conditions, active filters can be combined with common compensation capacitors, sub-compensation capacitors (L-N,L-L) and intelligent capacitors.

3. High cost performance:

The product makes full use of the economy of traditional filtering and compensation products and the advancement of power electronic products. The traditional filtering and compensation unit makes coarse adjustment for basic reactive power while absorbing some harmonics. The active filtering unit makes fine compensation for rapidly changing reactive power demand and harmonic current. At the same time, the reactive power bidirectional adjustment function of the active filtering unit can be used to effectively control the reactive power reverse transmission and make up for the inherent deficiency of the traditional filtering and compensation device.

4. Low self-loss:

Compared with pure power electronics solutions, HK-ASVG products replace most of the capacity with traditional filter compensation products, because the traditional product's own loss is much lower than the IGBT switching loss, active filter capacity is small, the device loss is low.

5. High reliability:

HK-ASVG products have advanced fault-tolerant operation function, that is, when an active filter unit or traditional filter compensation unit fails, the 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 is shut down due to transient fault, the traditional filter compensation unit can still operate independently.

● HK-ASVG intelligent integrated filter compensation device, with a variety of product combinations:

1. Active filter common compensation capacitor

The scheme is suitable for industrial loads, with low power factor, serious harmonic pollution and basic balance of three-phase current. The traditional filter compensation unit compensates the basic reactive power of the system and absorbs a small amount of harmonic current.

2. Active filter sub-compensation capacitor

The scheme is aimed at the working conditions of residential electricity load, three-phase current imbalance, small reactive power demand and even reactive power reverse transmission. The sub-compensation capacitor can be used to compensate the basic active and reactive power imbalance, so as to realize the approximate balance of three-phase current and improve the power factor of the system. The active filter unit is used to filter out the harmonic current generated by single-phase nonlinear load. At the same time, reactive fine compensation to achieve reactive local balance and reactive reverse transmission management, and finally, through the precise adjustment of three-phase current to achieve a complete balance of three-phase current, comprehensive solution to the distribution of power quality problems, to ensure the safety of residential electricity.

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