APF, Harmonic Control

详情

● Low DC-side voltage, only **0 V required, that has effective improved the life of both IGBT and DC capacitors, is the national initiative (patent number: ***********0.2).
 ● Easy to install on site, especially for renovation projects, no current transformer needs to be added, instead of the original and the PSPP owns can implement the monitoring and control of harmonics.
 ● **-inch high-definition touch screen, friendly man-machine interface, providing complete on-site information, historical information, and power quality comparison before and after filtering. Not only harmonic-filtering function, but also harmonic-detecting function that PSPP gives you, by such a screen you may conventionally know about harmonics in your grid and the quality of the electrical energy.
 ● Modular design, pre-installation, ease of maintenance.
 ● High harmonic filtering efficiency, effectively filter out the 2nd - *0th harmonics, also to the order-given.
 ● Fully digital-control DSP, with high-speed detection and operation, responds quickly to the dynamic changes of load, a full response time of less than 5 ms, ensures accurate and efficient harmonic detection and compensation control, and gives a full inhibition of voltage fluctuations and flicker.
 ● Can dynamically compensate for single-phase or three-phrase system harmonics, and the compensation effect meets the national standard GB/T*******3 Quality of Electric Energy Supply – Harmonics in Public Supply Network.
 ● No overload phenomenon, always run reliably even when encountering big harmonic current.
 ● Its filtering effect is free from systemic impedance changes, without syntony and harmonic amplification.
 ● Filtering, or filtering and / or reactive power compensation, you chose.
 ● Easy to operate and maintain, and multiple parallel operation can also be done.
 ● Centralized compensation or decentralized compensation is based on your power distribution structure.
 ● Standard communication interface(s).
 ● Complete protection functions: overload, over-temperature, over-voltage, over-current, under-voltage, fault self-diagnosis, etc.
 ● Effectively eliminate the zero-sequence harmonic and its generated neutral current (SNTA***8/4L series).
 


The functional principle is: in real time detect a load current waveform to find its harmonic current, then control IGBT triggering to inject direction-opposite equivalent current into power supply system, to achieve to filter off (offset) the harmonic, dynamically compensate. systemic reactive power and suppress voltage fluctuations and flicker, suppress resonance, and improve power factor and other functions, so as to improve the security of the power supply system and achieve the purpose of energy saving.

PSPP internal control principle is: After circuit breaker closing, PSPP firstly charge the DC bus capacitor by a pre-charge resistor, to prevent instant impact on the capacitor after power on. 8 seconds later, when the bus voltage Vdc reaching the rating, the master contactor is closed.

DC capacitor is an energy storage component, externally energizing to output compensation current via IGBT inverter and internal reactor, also internally energizing as a working power supply to internal detection and control panels through power exchange board.

SNTA***8 PSPP series through external CT collect current signal and send to a harmonic detection module, to separate from fundamental wave; then send the harmonic to a detection module to compare such harmonic with the compensation current that PSPP outputs, the difference as a real-time compensation signal to be output to the drive circuit. Based on such signal, PSPP injects a compensation current into the grid to filter harmonic out.