CN102916428A - Direct power control method of active-filtering and reactive power-compensating device - Google Patents
Direct power control method of active-filtering and reactive power-compensating device Download PDFInfo
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- CN102916428A CN102916428A CN201210422068XA CN201210422068A CN102916428A CN 102916428 A CN102916428 A CN 102916428A CN 201210422068X A CN201210422068X A CN 201210422068XA CN 201210422068 A CN201210422068 A CN 201210422068A CN 102916428 A CN102916428 A CN 102916428A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/20—Active power filtering [APF]
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Abstract
The invention relates to a direct power control method of an active-filtering and reactive power-compensating device, belonging to the technical field of power supply. The direct power control method is implemented in a control circuit comprising a signal sampling and processing circuit, a fundamental wave power detecting circuit, a direct power controller and a main circuit and comprises the steps of: acquiring network side voltage and network side current and inputting the network side voltage and the network side current to an FPGA (Field Programmable Gate Array); computing actual active power and actual reactive power according to the following formula by the FPGA; taking fundamental active power as reference active power and setting reference reactive power as zero; working out differences between the reference active power and the actual active power and between the reference reactive power and the actual reactive power respectively; and sending the differences into a main control CPU (Central Processing Unit) as the direct power controller to control the main circuit so as to make the output actual powers track the reference active power and the reference reactive power in real time for achieving active-filtering and reactive power-compensating functions. The direct power controller controls output of the active-filtering and reactive power-compensating device, so that aims of eliminating a harmonic and compensating the reactive power can be achieved.
Description
Technical field
The present invention relates to the control method of a kind of active power filtering and reactive power compensator, the direct Power Control method of especially a kind of active power filtering and reactive power compensator belongs to the power supply technique field.
Background technology
Understand according to the applicant, active power filtering of the prior art and reactive power compensator control method have following two classes:
1) i
p-i
qMethod: take the harmonic current signal as the control target, real time detection signal according to load current, by the instruction current computing circuit, utilize the instruction current that the coordinate transform theory draws needs compensation, produce by the current tracking control circuit that the and instruction size of current equates, the current injection device access point of opposite direction, with the purpose (referring to Fig. 1) that reaches the filtering harmonic wave.
Because i
p-i
qMethod is not directly used system voltage information, just by means of the sine and cosine functions of constructing, with be implemented in the synchronous rotating coordinate system of the resultant vector of three-phase fundamental current under the Park conversion, therefore, the precision of its testing result is not subjected to the impact of system voltage wave distortion.i
p-i
qAlthough but the harmonic current that method establishment nonlinear load produces also is widely applied in practice.But the method require by the synthetic synthetic vector of sine and cosine functions with the resultant vector of three-phase fundamental positive sequence voltage synchronous and same-phase, otherwise the accuracy of detection of fundamental positive sequence idle component will be subject to the impact of phase difference.In addition, repeatedly adopt coordinate transform and inverse transformation in the control system, affected the real-time of system.
2) p-q method: take harmonic power as the control target.According to instantaneous power theory, the system voltage and the load current signal that detect are in real time calculated through carrying out instantaneous power after the coordinate transform, then can obtain active power and the reactive power that the load-side harmonic current produces by low pass filter (LPF) and simple mathematical operation, with this reference power as active power filtering and reactive power compensator.Simultaneously, the output current that installs is carried out Real-time Collection, calculate the meritorious and reactive power of reality that device is exported through coordinate transform and instantaneous power.Send into direct Power Control device (the of a specified duration and work referring to " nonlinear Control of voltage type PWM rectifier " chapter 3 king with reference to the deviation of power and actual power, China Machine Press, 2008) make the actual power track reference power signal of its output with the control device main circuit, reach the purpose (referring to Fig. 2) of harmonic carcellation.
The core concept of p-q method is (referring to paper: based on the Shunt of direct Power Control, author Huang Chongxin, the king runs quickly, Qian Bifu, Bao Peng, " electrical measurement and instrument ", the 5th phase in 2009) be to extract harmonic component according to the result that defined instantaneous power fluctuation part is harmonic current and system voltage effect, the method can accurately detect the harmonic component of instantaneous power when system's three-phase voltage symmetry does not contain harmonic wave, but it is larger to detect error when there is distortion in line voltage itself, and its accuracy of detection is subjected to the impact of grid voltage quality.In addition, owing to repeatedly adopt coordinate transform and instantaneous power to calculate, so control system is complicated, response speed is slower.
Summary of the invention
The object of the invention is to: for the shortcoming that above-mentioned prior art exists, propose a kind of direct Power Control method that need not the relatively simple active power filtering of coordinate transform, control and reactive power compensator, thereby improve response speed.
In order to reach above purpose, the direct Power Control method of active power filtering of the present invention and reactive power compensator is containing the common signal sampling treatment circuit that consists of of AD sampling modulate circuit and signal synchronization circuit, include FPGA (the Field-Programmable Gate Array of low pass filter, be field programmable gate array) the fundamental power testing circuit that consists of, the direct Power Control device that master cpu consists of, in the active power filtering that full control power electronic device consists of and the control circuit of reactive power compensation main circuit, the three-phase current of described signal acquisition processing circuit, the three-phase voltage signal collection terminal is respectively by electric current and voltage transformer and three-phase power line coupling, the signal output part of described signal acquisition processing circuit connects respectively the corresponding input of described fundamental power testing circuit and direct Power Control device, the corresponding input of the processing signals output termination direct Power Control device of described fundamental power testing circuit, the control signal output of described direct Power Control device connects the controlled end of each full control power electronic device in the main circuit by drive circuit, in order to control the break-make of each full control power electronic device of main circuit, realize direct Power Control; Its control step is as follows:
The first step, described voltage and current instrument transformer will gather the voltage on line side u of supply line that obtains
Sa, u
Sb, u
ScAnd current on line side i
Sa, i
Sb, i
ScThe real-time sampling value be transported to FPGA as the fundamental power testing circuit;
Second step FPGA calculates the actual active-power P of supply line
sAnd reactive power Q
sUsually be calculated as follows:
P
s＝u
sai
sa+u
sbi
sb+u
sci
sc
The 3rd step, FPGA are with actual active-power P
sFundamental active power P behind low-pass filtering (LPF) filtering harmonic wave
SfAs the reference active-power P
*=P
Sfo, and to set with reference to reactive power be zero, i.e. Q
*=0;
The 4th step, FPGA try to achieve respectively with reference to active power, with reference to difference DELTA P and the Δ Q of reactive power and actual active power, actual reactive power;
Δ P, Δ Q that the 5th step, FPGA will calculate in real time send into the master cpu as the direct Power Control device, make the actual power real-time tracking of its output with reference to gaining merit and reactive power realization active power filtering and reactive power compensation in order to control described main circuit.
Compare with above-mentioned two kinds of prior aries, it is more to the invention solves the coordinate transform number of times, control system is complicated, response speed waits problem slowly, real-time sampling line voltage and current on line side, after simple and direct computing, obtain the fundamental active power of net side by LPF, with this as control one of target, setting simultaneously the Reactive Power Control target is zero, output by Direct Power device control active power filtering and reactive power compensator, make system side active power real-time tracking target fundamental active power signal, the system side reactive power is zero, reaches simultaneously the purpose of harmonic carcellation and compensating reactive power.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is prior art i
p-i
qThe method electrical block diagram.
Fig. 2 is prior art p-q method electrical block diagram.
Fig. 3 is the electric power system electrical block diagram of one embodiment of the invention.
Fig. 4 is the electrical block diagram of FPGA among exploded view 3 embodiment.
Embodiment
Embodiment one
The direct Power Control method hardware control circuit of present embodiment active power filtering and reactive power compensator as shown in Figure 3, contain AD sampling modulate circuit and (see " Basic Analog Electronics " for details, Yang Shuanke, Higher Education Publishing House, 2010) and signal synchronization circuit (it is clear to see " measure design of electronic circuits: a filter piece of writing (application from the design of filter to the lock-in amplifier) " slope person of outstanding talent far away for details, Peng Junyi, Science Press, 2006) the common signal sampling treatment circuit that consists of, include FPGA (the Field-Programmable Gate Array of low pass filter, be field programmable gate array---the EP2C8T144 chip) the fundamental power testing circuit of conduct, the direct Power Control device that master cpu (TMS320F28335 chip) consists of (the of a specified duration and work referring to " nonlinear Control of voltage type PWM rectifier " chapter 3 king, China Machine Press, 2008), full control power electronic device---active power filtering and reactive power compensation main circuit that the IGBT pipe consists of.The three-phase current of signal acquisition processing circuit, the three-phase voltage signal collection terminal is respectively by electric current and voltage transformer and three-phase power line coupling, the signal output part of signal acquisition processing circuit connects respectively the corresponding input of fundamental power testing circuit and direct Power Control device, the corresponding input of the processing signals output termination direct Power Control device of fundamental power testing circuit, the control signal output of direct Power Control device (sees " based on the design and research of the static reacance generator of multilevel converter " for details by drive circuit, Gao Wei, Institutes Of Technology Of Nanjing's Master's thesis, 2006.6, Fig. 5 .3.1) connects each full control power electronic device---controlled end of IGBT pipe in the main circuit, in order to control the break-make of each full control power electronic device of main circuit, realize direct Power Control; It controls step following (referring to Fig. 4):
The first step, voltage and current instrument transformer will gather the voltage on line side u of supply line that obtains
Sa, u
Sb, u
ScAnd current on line side i
Sa, i
Sb, i
ScThe real-time sampling value be transported to FPGA as the fundamental power testing circuit;
Second step FPGA calculates the actual active-power P of supply line according to following formula
sAnd reactive power Q
s:
P
s＝u
sai
sa+u
sbi
sb+u
sci
sc
The 3rd step, FPGA are with actual active-power P
sFundamental active power P behind low-pass filtering (LPF) filtering harmonic wave
SfAs the reference active-power P
*=P
Sfo, and to set with reference to reactive power be zero, i.e. Q
*=0;
The 4th step, FPGA try to achieve respectively with reference to active power, with reference to difference DELTA P and the Δ Q of reactive power and actual active power, actual reactive power;
Δ P, Δ Q that the 5th step, FPGA will calculate in real time send into the master cpu as the direct Power Control device, make the actual power real-time tracking of its output with reference to gaining merit and reactive power realization active power filtering and reactive power compensation in order to control main circuit.
The control target of present embodiment is the fundamental power of supply line.At first obtain power system voltage by the voltage and current instrument transformer, the primary signal of electric current, behind AD sampling and signal conditioning circuit, send into the fundamental power testing circuit, obtain system reference fundamental active power and actual reactive power, master cpu is finished further data processing and system synchronization according to reference fundamental power signal and AD sampling conditioned signal, the output control signal, and trigger the full control power electronic device of active power filtering and reactive power compensator main circuit by drive circuit, realize the fundamental power of real-time tracking system, reach the purpose of harmonic carcellation and compensating reactive power.Below each hardware component part is described in further detail:
(1) voltage, current transformer: the instrument transformer plate of three-phase voltage and three-phase current access active power filtering and reactive power compensator.The instrument transformer plate is converted into voltage signal with three-phase current signal, and three-phase voltage signal is dropped to the manageable scope of system.
(2) signal is synchronous: adopt synchronous third-order low-pass filter and zero-crossing comparator that the output signal of threephase potential transformer is carried out filtering and synchronously processing, and generation square wave synchronizing signal sends to master cpu.
(3) AD sampling and signal condition: the output of threephase potential transformer summation current transformer is sampled and necessary signal condition, and data are outputed to FPGA and master cpu.
(4) fundamental power testing circuit: adopt FPGA (EP1C6Q240C8) to realize, it is according to reference fundamental active power and the reactive power of AD sampling and signal condition output real time computation system partly, and result of calculation is sent to master cpu.
(5) master cpu: adopt DSP28335 to realize, be responsible for the various information of input are carried out the realization of data processing, electrical parameter calculation and control algolithm.Simultaneously, can also be connected with upper machine communication by communication interface, sampling and the various data of calculating gained be sent to host computer dispatch for whole active power filtering and reactive compensation system.Master cpu is the core of active power filtering and reactive compensation controlling device control section.
(6) driver module: be responsible for impulse level with master cpu output and be converted to and be enough to drive the pwm signal that active power filtering and reactive power compensator main circuit are controlled power electronic device entirely.
(7) main circuit: according to each complete break-make of controlling power electronic device of pwm signal control main circuit of drive circuit output, realizing the purpose of filtering harmonic wave and compensating reactive power, is the operating part of whole active power filtering and reactive power compensator.
Theoretical and experiment shows, present embodiment is more for the existing coordinate transform number of times of existing control strategy, control system is complicated, response speed waits problem slowly, real-time sampling line voltage and current on line side, after simple and direct computing, obtain the fundamental active power of net side by LPF, with this as control one of target, setting simultaneously the Reactive Power Control target is zero, control the output of active power filtering and reactive power compensator by the Direct Power device, make system side active power real-time tracking target fundamental active power signal, the system side reactive power is zero, reaches simultaneously the purpose of harmonic carcellation and compensating reactive power.Its significant advantage is:
1) fundamental active power of direct tracking system is controlled simple and direct direct;
2) need not Harmonics Calculation and coordinate transform, fast response time;
3) can realize simultaneously active power filtering and reactive power compensation, compensation effect is good;
4) hardware circuit is simple, is easy to Project Realization.
Claims (4)
1. the direct Power Control method of an active power filtering and reactive power compensator, it is characterized in that: containing the common signal sampling treatment circuit that consists of of AD sampling modulate circuit and signal synchronization circuit, include the fundamental power testing circuit of the FPGA formation of low pass filter, the direct Power Control device that master cpu consists of, in the active power filtering that full control power electronic device consists of and the control circuit of reactive power compensation main circuit, the three-phase current of described signal acquisition processing circuit, the three-phase voltage signal collection terminal is respectively by electric current and voltage transformer and three-phase power line coupling, the signal output part of described signal acquisition processing circuit connects respectively the corresponding input of described fundamental power testing circuit and direct Power Control device, the corresponding input of the processing signals output termination direct Power Control device of described fundamental power testing circuit, the control signal output of described direct Power Control device connects the controlled end of each full control power electronic device in the main circuit by drive circuit, in order to control the break-make of each full control power electronic device of main circuit, realize direct Power Control; Its control step is as follows:
The real-time sampling value that the first step, described voltage and current instrument transformer will gather the voltage on line side usa of supply line, usb, usc and current on line side isa, the isb that obtain, isc is transported to the FPGA as the fundamental power testing circuit;
Second step FPGA calculates actual active-power P s and the reactive power Q s of supply line:
The 3rd step, FPGA are with the fundamental active power P of actual active-power P s behind low-pass filtering filtering harmonic wave
SfAs the reference active-power P
*=P
Sfo, and to set with reference to reactive power be zero, i.e. Q
*=0;
The 4th step, FPGA try to achieve respectively with reference to active power, with reference to difference DELTA P and the Δ Q of reactive power and actual active power, actual reactive power;
Δ P, Δ Q that the 5th step, FPGA will calculate in real time send into the master cpu as the direct Power Control device, make the actual power real-time tracking of its output with reference to gaining merit and reactive power realization active power filtering and reactive power compensation in order to control described main circuit.
2. the direct Power Control method of described active power filtering and reactive power compensator according to claim 1, it is characterized in that: in the described second step, FPGA is calculated as follows actual active-power P s and the reactive power Q s of supply line:
P
s＝u
sai
sa+u
sbi
sb+u
sci
sc
3. the direct Power Control method of described active power filtering and reactive power compensator according to claim 2, it is characterized in that: described full control power electronic device is the IGBT pipe.
4. the direct Power Control method of described active power filtering and reactive power compensator according to claim 3, it is characterized in that: described master cpu is connected with upper machine communication by communication interface, in order to will sample and computed information sends to host computer for the scheduling of whole active power filtering and reactive compensation system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311929A (en) * | 2013-06-05 | 2013-09-18 | 广西华赣电力设备有限公司 | Device used for clearing voltage harmonic waves of power system |
| CN111596124A (en) * | 2020-04-27 | 2020-08-28 | 西安许继电力电子技术有限公司 | Wireless charging receiving side active full-bridge power factor angle detection device and detection method |
| CN113507129A (en) * | 2021-02-22 | 2021-10-15 | 华自科技股份有限公司 | Reactive power compensation method and device for power station, computer equipment and storage medium |
| CN114252837A (en) * | 2021-12-17 | 2022-03-29 | 常州同惠电子股份有限公司 | High-precision equal sampling system and method for harmonic measurement of digital power meter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311929A (en) * | 2013-06-05 | 2013-09-18 | 广西华赣电力设备有限公司 | Device used for clearing voltage harmonic waves of power system |
| CN111596124A (en) * | 2020-04-27 | 2020-08-28 | 西安许继电力电子技术有限公司 | Wireless charging receiving side active full-bridge power factor angle detection device and detection method |
| CN111596124B (en) * | 2020-04-27 | 2022-06-17 | 西安许继电力电子技术有限公司 | Wireless charging receiving side active full-bridge power factor angle detection device and detection method |
| CN113507129A (en) * | 2021-02-22 | 2021-10-15 | 华自科技股份有限公司 | Reactive power compensation method and device for power station, computer equipment and storage medium |
| CN114252837A (en) * | 2021-12-17 | 2022-03-29 | 常州同惠电子股份有限公司 | High-precision equal sampling system and method for harmonic measurement of digital power meter |
| CN114252837B (en) * | 2021-12-17 | 2024-02-27 | 常州同惠电子股份有限公司 | High-precision equal sampling system and method for harmonic measurement of digital power meter |
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Application publication date: 20130206 |