Power Quality Solutions-Power Wiser Active Power Filter

1.Application scope

It is widely used in metallurgy, mine, petrochemical industry, architecture, coal, machine manufacturing, all kinds of transformer station and power distribution rooms with harmonic source, at the same time, it is also widely used in these power grids with non-linear, impact, and unbalanced loads to solve power quality questions.

2.Principle

The power wider controlled PWM converter and then input compensated current into power grid which is same with harmonic current, but with inverse polarity, and in the end, realized harmonic filter, dynamic reactive power compensation, resonance restraining and power factor enhancing.

3.Function features

Compensate any order harmonic with variational amplitude and frequency and different reactive power dynamically, and has a high-speed response time to the change of compensation object.

Compensate harmonic and reactive power synchronously, and realize stepless conversion for reactive power compensation.

Unnecessary for energy storage element when the Power Wiser implement reactive power compensation; Energy storage element capacity are not large when the Power Wiser implement harmonic compensation.

Even though the current of compensation object is a bit large, the power active filter will not overload, and implement compensation function normally.

It is very difficulty for Power Wiser to produce resonance with power grid impedance.

It can follow the change of power grid frequency, so compensation characteristic is not affected by power grid frequency

It can implement compensation on single harmonic and reactive power source and also implement centralized compensation on many harmonic and reactive power sources.

4. Usage mode

4.1  Parallel connection of active power filter

The Power Wiser is parallel connection with input power grid, and compensation current is generally provided by active power filter, it is the most useful mode at present. 

4.2  Use active power filter with LC filter together

This mode is applied based on parallel connection of active power filter with power grid because of a shortage of parallel connection with large capacity. Its basic principle is that LC power filter can share in partial compensation work for active power filter. Compared with active power filter, LC power filter has a compact structure and low cost, while the advantage of active power filter rests with its excellent compensation performance. Combining LC filter and active power filter, not only overcome the shortage of parallel connection with large capacity and high cost, but also make the system acquire better performance.

There are two usage modes for mixed application of active power filter and LC filter, one is parallel connection, and the other is series connection.

5. Specification and Specification choosing tenet.

5.1  The main specification and model of active power filter

The product capacity range is 30KVA-50KWA, the following is general specification and model of active power filter, the detailed specification and model of active power filter can also be made. (Dimension is subject to changes without further notice)

The digits 2,3,4,5, indicates double-faced cabinet, tri-faced cabinet, tetrahedral cabinet and pentahedral cabinet respectively.

5.2  Specification description

6. Working environment

Environmental temperature is between 5⁰C+40⁰C, the average temperature is not higher 35⁰C in 24Hours.

When the temperature is at 40⁰C, relative humidity is not above 50%; When the temperature is lower, high relative humidity is allowable, such as: at 20⁰C, the relative humidity is 90%.

The altitude not above 2KM.

No inflammable and corrosive gas and liquid, no conductive dust, floating fiber and metal particle.

No vibration for installation place, installation gradient below 5%.

The voltage fluctuated scope not over ±10% rated voltage.

The frequency fluctuated scope not over ±2% rated frequency.