Active wave filter
OVE-APFOVE-APF active power filter
fonction
The device is mainly composed of power converter, DC capacitor, control circuit board, current and voltage detection circuit,
various electrical switches and circuit protection devices and power wire (copper bar).
The active power filter is connected to the power grid in parallel, the load current of the compensated object is monitored in
real time through the sampling transformer, and the command signal of the compensated current is calculated through the
command current operation circuit. After the compensation current generation circuit, an equal and opposite command
current is generated, and the corresponding compensation current is quickly sent out by the main circuit of the power
electronic device IGBT. The harmonic in the load is offset in real time, so that the compensated power grid current is the ideal
current needed to eliminate the harmonic and purify the power grid.
濾波效果
Performance parameters and functions
1) Real-time harmonic filtering: with full compensation and discrete compensation functions, full compensation can simultaneously filter out all harmonics within 2 ~ 51 times; Discrete compensation is directed to filter out harmonics of a specific number, and more than 20 kinds of harmonics can be selected at a single time.
2) Reactive power compensation function: the device can not only compensate harmonics, but also have reactive power compensation and the function of controlling the three-phase imbalance of the system, and the compensation methods are diverse. It can effectively improve voltage distortion and suppress voltage fluctuation caused by impact load.
3) The controller adopts the full digital design platform of "DSP+CPLD", which has fast reaction speed and timely protection response, and will not be damaged due to abnormal power grid.
4) When the device itself fails, it has a self-protection function, but it does not interrupt the power supply circuit and does not affect other equipment that is running.
5) With advanced resonance protection technology, in the process of load change, if there is resonance, it should be able to automatically judge, and exit the system, and alarm to avoid failure.
6) With automatic current limiting function, when the compensation amount of the system demand is greater than the rated compensation amount of the compensation device, the rated compensation output of the compensation device will not occur overload, affecting the service life of the equipment.
7) With 485 and Ethernet communication interface, can achieve the user remote monitoring function requirements.
Application situation
Rectifiers, frequency converters, large UPS, intermediate frequency furnaces, electric arc furnaces, welding machines and other
industrial large-capacity nonlinear loads, as well as fluorescent lamps, computers, UPS, elevators, variable frequency air
conditioners and other widely used in commercial buildings, produce a large number of harmonics, which not only seriously
pollute the power grid, but also generate zero sequence harmonics superimposed on the neutral line, making the neutral line
heat up. The power distribution system security is seriously threatened. OVE-APF series active power filter can not only
compensate harmonics, but also have the function of reactive power compensation and control three-phase imbalance of the
system. The compensation methods are diverse, which can effectively improve voltage distortion and suppress voltage
fluctuations caused by impact loads.
The application projects involve many industries such as electric power, hospital, textile, rail transit, commercial, banking,
pharmaceutical factory, new energy, equipment processing and manufacturing.
technical index
Active power filter (APF) is a new type of power harmonic special equipment which combines modern power electronic
technology and digital signal processing technology. The active power filter is equivalent to a harmonic current generator,
which tracks the harmonic component of the harmonic source current and generates the harmonic current of equal amplitude
and reverse phase, so as to offset the harmonic current generated by the harmonic source.
Active power filter can be widely used in industrial, commercial, information industry and other fields of power harmonic
governance, governance effect is good, energy saving, material saving, is the latest development direction of harmonic
governance technology, has broad development prospects.
