Method and apparatus for combined tandem type active fundamental wave electric power reactive compensation and filtering
A series type, source fundamental wave technology, applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as complex calculation of fundamental wave and harmonic components, strong electromagnetic interference and noise, and difficulties, and achieve sampling And the effect of simple regulation, suppression of parallel resonance, simple and reliable circuit
Inactive Publication Date: 2007-12-12
王昆生
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Problems solved by technology
[0005] The following problems exist in the use of this type of method: the calculation of the fundamental wave and harmonic components in the load current is complex and requires high-speed calculation solutions, which brings difficulties in practical industrial applications; the converter generates anti-harmonics containing high-frequency harmonic components The current must adopt a high-frequency iron core that is more expensive than a silicon steel sheet iron core for power frequency and a fast tracking modulation that is 10 times faster than the operating frequency of the power frequency current modulation switch; the occurrence of anti-harmonic current will cause greater core additional loss, Ferromagnetic vibration and heat, and produce strong electromagnetic interference and noise; the existing UPQC uses two sets of active converter units, in addition to the complexity of the circuit and technology, it is also difficult to be practical due to the high cost
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[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The method, device and application of the composite series active fundamental wave power reactive power compensation and filtering method, device and application of the present invention will be further described in conjunction with the accompanying drawings.
[0029] As shown in the figure, a voltage sensor PTS is connected to the line at the PS side of the grid to obtain a voltage signal υ that is synchronized with the grid voltage S * , υ S * sent to the phase shifting unit 1, the phase shifting unit 1 is locked with υ S * Under the premise of the same frequency as the benchmark, relative to υ S * The current-adjusted sinusoidal fundamental wave current reference signal i of the converter unit with a phase shift of about 90° * Input to the current setting unit 2, the voltage sensor PTL or reactive power detector connected to the load 4 side obtains the voltage change at the load end or the reactive power signal...
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The invention is a method and device for a kind of compound series active fundamental wave electric reactive compensation. It integrates the fundamental current, voltage adjusting, load voltage, reactive power compensation and the carrier functions together, which is a method and device using active converting method to carry on the compensation and the filter of electric network reactive power and the load end voltage, it can solves the problems in current UPQC technology. The invention can generate the current reference signal only needing to acquire the synchronous signal voltage form the electric network voltage and carry on phase shift for 90 degrees, thus it can generate the signal needed in generating current by the power converting unit according to the amplitude of the current reference signal of the reactive compensation signal on the load end.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and relates to a method and a device for reactive power compensation and filtering of compound series active fundamental wave power. Background technique [0002] In order to compensate the grid reactive power and load terminal voltage and suppress harmonics, several unified power quality controllers (UPQC) have been developed at home and abroad in recent years, and the most representative methods and devices are as follows: [0003] A series active converter unit and a parallel active converter unit are used to form a unified power quality controller. The series converter unit plays the role of compensating voltage, and the parallel converter unit plays the role of compensating current harmonic and reactive power compensation. [0004] In this type of circuit, it is necessary to calculate and subtract the active and reactive fundamental components from the load current to obtain the h...
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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 王昆生李晓斌
Owner 王昆生