Introduction of Functions

Harmonic Filter: HTQF is composed of commandcurrent computing circuit and compensation current generatingcircuit. Command current computing circuit conducts real-timemonitoring of current in circuit; switch the analogue currentsignals into digital signals, and send the signals into DSP forhandling; separate harmonics and fundamental wave, send drive pulsein form of PWM signals to compensation current generating circuit;drive IGBT power module, produce compensation current input networkwhich has the same amplitude as harmonic amplitude and inversepolarity; compensate or balance out harmonic current, eliminatepower harmonics actively, and thus realize the dynamic quick andcomplement treatment of power harmonics.

Dynamic reactive power compensation: Whilefiltering harmonics, according to detected need for reactive powercompensation, HTQF command current computing circuit can controlinternal capacitive and inductive fundamental current ofcompensation current generating circuit, conduct real-timecompensation, set the target value of reactive power compensationthrough operation board. There are 4 working modes for choice,namely, “filter priority”, “reactive power priority”, “harmonicfilter only”, “and reactive power compensation only”. The workingmode should be selected according to specific conditions of powerdistribution system.

Correct unbalanced 3 phases: HTQF cancompensate the unbalanced 3 phases respectively. It can conductphase adjustment of active power through DC Energy Storage Systemsshared by 3 phases, thus to correct unbalanced load of 3 phases.The operation of this function can also be set by operationboard.