CN110165659A - Suitable for the three-phase four-wire system utility power quality control device and method containing distributed power distribution network - Google Patents
Suitable for the three-phase four-wire system utility power quality control device and method containing distributed power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
Abstract
The invention discloses a kind of suitable for the three-phase four-wire system utility power quality control device and method containing distributed power distribution network, it is related to power quality controlling equipment field, data are mainly acquired by acquisition module, it send to digital signal processor module DSP and is handled, PWM modulation signal is exported to be modulated to inverter bridge, digital signal processor module DSP is input to by anti-interference filter and A/D conversion module particularly as being acquisition module collected analog signal, then after core processing, it exports to drive module, then it exports again to the control terminal of inverter bridge IGBT, to realize the regulation to power quality.The present invention is from completely new improvement angle, the power quality problems such as the power factor of effectively solution power distribution network is low, uneven, harmonic pollution is serious, it is provided simultaneously with the function of real-time monitoring distribution network electric energy quality, effectively improve its voltage regulation capability, to increase voltage stability margin, structure is simple, realizes that convenient and regulation effect is good.
Description
Technical field
The present invention relates to the tune of power quality controlling equipment field, more particularly to the power quality containing distributed power distribution network
Control, it is specially a kind of suitable for the three-phase four-wire system utility power quality control device and method containing distributed power distribution network.
Background technique
When power distribution network largely accesses distributed generation resource and high-power electric and electronic load, due to electric power such as gird-connected inverters
There are strong nonlinearities, unbalanced feature for the access of electronic device and modern power electronic load, it will so that power distribution network
The power factor of point of common coupling (point of common coupling, PCC) reduces, imbalance is aggravated, harmonic pollution is tight
Weight, causes platform loss on transmission consumption to increase, reduced service life, and the safety and stability for being unfavorable for power distribution network is efficiently run.
Chinese invention patent " a kind of Active Power Filter-APF closed loop control method based on decoupling resonant regulator array "
(publication number: 102623996A) discloses a kind of by introducing the New Resonance regulator array with decoupling function, and Lai Shixian has
The method of active power filter system closed-loop control can effectively improve the robustness and entire compensation performance of system, but each time humorous
Wave needs corresponding resonant modulation device, excessive occupied system resources, when processing overtone order is more, using limited.Middle promulgated by the State Council
Bright patent " a kind of parallel type quasi-proportional resonance active power filter and control method " (publication number: 103683292A) is open
It is a kind of to use quasi- ratio resonant controller, more accurate tracking is realized to mains frequency, solving PI tracking can not to of ac
The problem of realizing DAZ gene, when more there is also processing overtone order, using limited problem.
Utility power quality control traditional at present is equipped mainly with load currenti la 、i lb 、i lc It is that one kind is opened to compensate target
Ring control strategy, vulnerability to jamming, compensation performance are poor；The distributed electrical source category especially accessed in power distribution network under existing situation
It is various, property difference is very big so that the particularity of itself is presented in distribution network electric energy quality problem, to utility power quality control equipment
Dynamic response requirement is higher.Therefore, common utility power quality control equipment dynamic characteristic cannot generally require.When compensation capacity exceeds
When the compensation ability of device, the measure of hardware current limliting is generally taken, compensation electric current is caused to cut top, power supply is injected instead richer
Rich harmonic wave.
Therefore, in order to ensure distributed generation resource access after distribution system safe and stable, economical operation, be electric power
User provides good power quality, proposes a kind of suitable for the three-phase four-wire system power quality containing distributed power distribution network
Control device and method, the device and method have important meaning for the power supply reliability and power supply quality that improve distribution system
Justice.
Summary of the invention
After the present invention is in order to solve distributed generation resource access power distribution network, the safe and stable operation and regulation of distribution system
The problem of power quality, provides a kind of suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network
And method.
The present invention is achieved by the following technical solution: a kind of suitable for the three-phase four containing distributed power distribution network
Line utility power quality control device, including inverter bridge, acquisition module and the digital signal processor module DSP being made of IGBT,
The acquisition module is surveyed with the direct current of distribution network system side and inverter bridge connect respectively, and the output end of the acquisition module passes through anti-
Interference filter is connect with the input terminal of A/D conversion module, the output end of the A/D conversion module by input interface module with
The input terminal of digital signal processor DSP connects, the output end of the digital signal processor DSP and the input terminal of drive module
Connection, the output end of the drive module are connected with the control terminal of IGBT in inverter bridge；The digital signal processor DSP is also logical
Communication module is crossed to connect with external man-machine interface.
The present invention be on the basis of micro-capacitance sensor, in power distribution network due to access distributed generation resource and other kinds of electricity
The particularity for the power quality problem that power electronics load generates, from completely new improvement angle, and the power quality control proposed
Device and method processed mainly acquires data by acquisition module, send to digital signal processor module DSP and handled, defeated
PWM modulation signal is modulated inverter bridge out, particularly as being the collected analog signal of acquisition module passes through anti-interference filter
Wave device and A/D conversion module are input to digital signal processor module DSP, then after core processing, output to driving mould
Then block is exported again to the control terminal of inverter bridge IGBT, to realize the regulation to power quality.
The regulation method of above-mentioned electric energy control device, includes the following steps:
1) acquisition module obtains distribution network system side voltage signalu sa 、u sb 、u sc And current signali sa 、i sb 、i sc , obtain simultaneously
DC bus-bar voltage signalU dc , then obtain load currenti la 、i lb 、i lc , and voltage signal and current signal are sent to digital letter
Number processor DSP；
2) voltage signal of distribution network system sideu sa 、u sb 、u sc By digital phase-locked loop, the voltage-phase of grid entry point is calculatedsin θ、cosθ, frequency, and be converted toαβγIn rest frameu sα 、u sβ 、u sγ ；DC bus-bar voltage signalU dc Believe by number
Number processor module DSP calculates DC bus-bar voltage deviation signalΔU dc , and then proportion of utilization-integral element calculate withΔ U dc Corresponding active currenti dref , compensation target is set as comprehensive compensation, i.e., compensates simultaneously idle, humorous in power distribution network
Wave, imbalance enablei qref =0、i oref =0, the phase information of digital phase-locked loop offer is providedsinθ、cosθ, pass through PARK contravariant
It changes, is converted toαβγIn rest framei sαref 、i sβref 、i sγref , maintain the straight of three-phase four-wire system utility power quality control device
It is constant to flow busbar voltage；
3) by the current signal of collected distribution network system sidei sa 、i sb 、i sc , CLARK is passed through by digital signal processor DSP
Transformation, is converted toαβγIn rest framei sα 、i sβ 、i sγ , and by it and reference currenti sαref 、i sβref 、i sγref It compares
Compared with, input of the difference as current loop controller, i.e., are as follows:i αc =i sαref - i sα ,i βc =i sβref - i sβ ,i γc =i sγref - i sγ ；After input current ring controller, calculation process generates modulated signalm α *、m β *、m γ *；
4) to three-phase four-wire system utility power quality control device dynamic response in the case of being fluctuated in view of sudden load change, distribution network voltage
The requirement of speed, by collected load currenti la 、i lb 、i lc , converted, be converted to by CLARK by digital signal processor DSPα βγIn rest framei lα 、i lβ 、i lγ , by load currenti lα 、i lβ 、i lγ And network voltageu sα 、u sβ 、u sγ Make feed-forward process
After obtain modulated signalm α 、m β 、m γ , rightm α 、m β It carries out CLARK inverse transformation and generates modulated signalm a 、m b 、m c ABC phase bridge arm is controlled,m γ For controllingNPhase bridge arm, finally to modulated signalm a 、m b 、m c 、m n It carries out PWM modulation and generates driving signal control IGBT inversion
The conducting of bridge turns off, and three-phase four-wire system utility power quality control device is made to export desired compensation electric current.
The current loop controller be by proportional integration PI, vector resonance VR, that Repetitive controller RC constitutes Multiple Models is compound
Controller；Wherein, proportional integration PI controls the stability for enhancing three-phase four-wire system utility power quality control apparatus control system
Its dynamic response rate is improved simultaneously, and vector resonance VR controls for realizing the floating to fundamental frequency AC compounent and low-order harmonic
Tracing control, Repetitive controller RC then can be realized the tracing control to harmonic component, the transmitting of the Multiple Models composite controller
Function are as follows:
(1) 。
The governing equation of the feed-forward process is as follows:
(2)。
Compared with prior art the invention has the following advantages: 1, propose improved current inner loop control method i.e.
Multiple Models complex controll, this method rapid dynamic response speed, compensation effect is good, using the three-phase four-wire system power quality of this method
Regulation device system stability is high；2, perfect three-phase four-wire system power quality control device control circuit is proposed, in basis
Itd is proposed control algolithm is run on the controller that the circuit production goes out, and may be implemented to the effective of distribution network electric energy quality problem
It administers.3, the controller fast response time, can carry out tracing compensation in response to load variations in a short time.4, the present invention is mentioned
Three-phase four-wire system power quality control device simultaneously can also be applied in three-phase three-line system, convenient for expand.Meanwhile this hair
The electric energy matter such as the bright power factor for from completely new improvement angle, effectively solving power distribution network is low, uneven, harmonic pollution is serious
Amount problem is provided simultaneously with the function of real-time monitoring distribution network electric energy quality, effectively improves its voltage regulation capability, to increase electricity
Stability margin is pressed, reduces voltage fluctuation and flicker, while reducing " pollution treatment " cost, three-phase four-wire system electric energy proposed by the invention
Quality control apparatus has the advantages that structure is simple, realizes that convenient and regulation effect is good.
Detailed description of the invention
Fig. 1 is main circuit structure figure of the invention.
Fig. 2 is system control principle drawing of the invention.
Fig. 3 is current inner loop controller schematic diagram of the invention.
Fig. 4 is modular structure block diagram of the invention.
Fig. 5 is that control method of the invention realizes main program flow chart.
Fig. 6 is the load wave simulation figure for not using any control method.
Fig. 7 is using the power distribution network network side current waveform analogous diagram after conventional proportional Repetitive control compensation.
Fig. 8 is is proposed the compensated power distribution network network side current waveform analogous diagram of method using the present invention.
Fig. 9 is using the load waveform lab diagram after method proposed by the invention.
Figure 10 is is proposed network side current waveform lab diagram after method compensates using the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
It is a kind of suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network, such as Fig. 1 and Fig. 4 institute
Show, including inverter bridge, acquisition module and the digital signal processor module DSP being made of IGBT, the acquisition module respectively with
The direct current of distribution network system side and inverter bridge surveys connection, and the output end of the acquisition module is turned by anti-interference filter and A/D
The input terminal connection of block is changed the mold, the output end of the A/D conversion module passes through input interface module and digital signal processor DSP
Input terminal connection, the output end of the digital signal processor DSP connects with the input terminal of drive module, the drive module
Output end connected with the control terminal of IGBT in inverter bridge；The digital signal processor DSP also passes through communication module and outside
Man-machine interface connection.
In the present embodiment: it further include co-processor module, the voltage of the co-processor module calculating power distribution network grid entry point,
The total harmonic distortion factor of electric current, degree of unbalancedness, after being communicated with human-computer interface module by communication module, man-machine interface into
Row visualization.
The control method of three-phase four-wire system utility power quality control device provided by the present embodiment, as shown in Figure 2 and Figure 5,
Include the following steps:
1) acquisition module obtains distribution network system side voltage signalu sa 、u sb 、u sc And current signali sa 、i sb 、i sc , obtain simultaneously
DC bus-bar voltage signalU dc , then obtain load currenti la 、i lb 、i lc , and voltage signal and current signal are sent to digital letter
Number processor DSP；
2) voltage signal of distribution network system sideu sa 、u sb 、u sc By digital phase-locked loop, the voltage-phase of grid entry point is calculatedsin θ、cosθ, frequency, and be converted toαβγIn rest frameu sα 、u sβ 、u sγ ；DC bus-bar voltage signalU dc Believe by number
Number processor module DSP calculates DC bus-bar voltage deviation signalΔU dc , and then proportion of utilization-integral element calculate withΔ U dc Corresponding active currenti dref , compensation target is set as comprehensive compensation, i.e., compensates simultaneously idle, humorous in power distribution network
Wave, imbalance enablei qref =0、i oref =0, the phase information of digital phase-locked loop offer is providedsinθ、cosθ, pass through PARK contravariant
It changes, is converted toαβγIn rest framei sαref 、i sβref 、i sγref , maintain the straight of three-phase four-wire system utility power quality control device
It is constant to flow busbar voltage；
3) by the current signal of collected distribution network system sidei sa 、i sb 、i sc , CLARK is passed through by digital signal processor DSP
Transformation, is converted toαβγIn rest framei sα 、i sβ 、i sγ , and by it and reference currenti sαref 、i sβref 、i sγref It compares
Compared with, input of the difference as current loop controller, i.e., are as follows:i αc =i sαref - i sα ,i βc =i sβref - i sβ ,i γc =i sγref - i sγ ；After input current ring controller, calculation process generates modulated signalm α *、m β *、m γ *；
Current loop controller is to constitute Multiple Models composite controller by proportional integration PI, vector resonance VR, Repetitive controller RC；Such as figure
Shown in 3, wherein proportional integration PI control is same for enhancing the stability of three-phase four-wire system utility power quality control apparatus control system
Its dynamic response rate of Shi Tigao, vector resonance VR control for realizing the floating to fundamental frequency AC compounent and low-order harmonic with
Track control, Repetitive controller RC then can be realized the tracing control to harmonic component, the transmitting letter of the Multiple Models composite controller
Number are as follows:
(1)。
4) to three-phase four-wire system utility power quality control device dynamic in the case of being fluctuated in view of sudden load change, distribution network voltage
The requirement for responding speed, by collected load currenti la 、i lb 、i lc , converted, turned by CLARK by digital signal processor DSP
It is changed toαβγIn rest framei lα 、i lβ 、i lγ , by load currenti lα 、i lβ 、i lγ And network voltageu sα 、u sβ 、u sγ It feedovers
Modulated signal is obtained after processingm α 、m β 、m γ , rightm α 、m β It carries out CLARK inverse transformation and generates modulated signalm a 、m b 、m c Control ABC phase
Bridge arm,m γ For controllingNPhase bridge arm, finally to modulated signalm a 、m b 、m c 、m n It carries out PWM modulation and generates driving signal control
The conducting of IGBT inverter bridge turns off, and three-phase four-wire system utility power quality control device is made to export desired compensation electric current:
The governing equation of feed-forward process is as follows:
(2)。
It is illustrated in figure 2 system control block figure of the invention, mainly includes Voltage loop control and the big portion of current loop control two
Point.Outer voltage is using the proportional, integral PI control with amplitude limited characteristic, outputi sd *For equivalent load, that is, load and three-phase
Total watt current of both four-wire system utility power quality control devices consumption.In order to realize that the unity power factor to equivalent load is controlled
Reason, considering willqShaft current reference valuei sq *It is set as 0, i.e. load and three-phase four-wire system utility power quality control device is from power distribution network system
Total reactive power that side absorbs of uniting is zero.0Axis isγThe zero sequence as caused by imbalance in shaft current representation in components distribution network system
Current component, that is, neutral current considers that the compensated equivalent load of three-phase four-wire system utility power quality control device realizes three-phase
Symmetrical balance, will0Shaft current reference valuei s0 *It is also set to 0.Reference currenti sd *、i sq *、i s0 *By the anti-coordinate transform of IPARK
I.e.T dq0/αβγ After generateαβγCurrent reference value under rest framei sαβγ *.Equally to current on line sidei si (i=a,b,c) into
Row CLARK is convertedT abc/αβγ It obtainsi sαβγ , by the reference value of electric current loopi sαβγ *With current on line sidei sαβγ After making difference, by electricity
Stream controller, that is, Multiple Models composite controller calculation process generates modulated signalm αβγ *.It further considers sudden load change, match
To the strict demand of three-phase four-wire system utility power quality control device dynamic responding speed in the case of voltage ripple of power network, by load electricity
Streami lαβγ , grid entry point voltagee αβγ Modulated signal is obtained after making feed-forward processm αβγ , rightm αβγ It carries outT αβγ/abc It is generated after transformation
Modulated signalm abc For controlling ABC phase bridge arm, finally to modulated signalm abcn It carries out PWM modulation and generates driving signal to control
The conducting of switching device IGBT turns off, and makes the desired compensation electric current of three-phase four-wire system utility power quality control device final output.
It is illustrated in figure 3 current inner loop controller functional block diagram of the invention, three-phase four-wire system utility power quality control device
Current loop controller i.e. Multiple Models complex controll is constituted by proportional integration PI, vector resonance VR, Repetitive controller RC.Wherein, PI
It controls for enhancing the stability of three-phase four-wire system utility power quality control apparatus control system while improving its dynamic response rate,
Vector resonance VR control then can for realizing the DAZ gene control to fundamental frequency AC compounent and low-order harmonic, Repetitive controller RC
Enough tracing controls realized to harmonic component.Using the three-phase four-wire system utility power quality control device of Multiple Models complex controll in height
Larger gain still can be obtained at subharmonic, so as to realize set compensation target.
It is a kind of suitable for the three-phase four-wire system utility power quality control containing distributed power distribution network to be illustrated in figure 5 the present invention
The main program flow chart of device and method: the corresponding control program of internal memories of digital signal processors storage, program are calculating power distribution network
When current on line side, zero-sequence component, negative sequence component, the harmonic component in power distribution network current on line side are passed through into Multiple Models composite controller
Corresponding command signal is generated, is avoided caused by current general Harmonic detection influenced by distribution network system voltage distortion
The problem of wave distortion, and then possible interference is eliminated, improve control effect further.It is specific as follows:
Step1 program starts, and Step2 is that control system is initialized, the acquisition and storage of Step3 progress signal, and Step4 pairs
Voltage, the current signal of acquired distribution network system are pre-processed, and Step5 is detected the phase of distribution network system by digital phase-locked loop
The information such as position, frequency provide support for the realization of next control strategy, calculate the ginseng generated to DC voltage in Step6
Examine electric currenti sd *、i sq *、i s0 *It is by the anti-coordinate transform of IPARKT dq0/αβγ After ultimately generateαβγElectricity under rest frame
Flow reference valuei sαβγ *, Step7 is by current on line sidei si (I=a, b, c) transform toαβγUnder three-phase static coordinate systemi sαβγ , will be electric
Flow the reference value of ringi sαβγ *With current on line sidei sαβγ After making difference, at overcurrent controller, that is, Multiple Models composite controller operation
Reason generates modulated signal, is considered when necessary by load currenti lαβγ , grid entry point voltagee αβγ Make feed-forward process, Step8 calculates life
At pwm control signal, enter Step9 after having executed Step 8, the conducting that output control signal carrys out control switch device IGBT is closed
It is disconnected, make the desired compensation electric current of three-phase four-wire system utility power quality control device final output.
In order to preferably verify feasibility of the invention, the three-phase four-wire system electric energy matter applied to 0.4kV power distribution network is built
Amount control device simulation model and test platform are emulated and are tested.In view of safety, system parameter when emulating and testing are as follows:
Alternating voltage 110V, frequency 50Hz, the device parameter of three-phase four-wire system utility power quality control device are as follows: DC voltage 400V, straight
Galvanic electricity holds 10000uf, linked reactor is 1mH.
It is illustrated in figure 6 when not putting into three-phase four-wire system utility power quality control device and compensating, by single-phase in power distribution network
The non-linear uncompensated load of the compositions such as rectifier bridge at the time of t=0.1s load current virtual value by: 57.12A, 65.09A,
54.73A mutation are as follows: 92.22A, 111.09A, 54.73A, corresponding THD are sported by 59.03%, 56.26%, 46.83%
55.07%, 56.26%, 46.42%, three-phase load Current harmonic distortion, energy imbalance are serious.
As shown in Figure 7 for by compensated using the three-phase four-wire system utility power quality control device of conventional proportional Repetitive controller
Power distribution network network side current waveform figure can be effectively reduced current on line side harmonic content and degree of unbalancedness, compensated current on line side
Virtual value fades to 76.85A, 76.95A, 76.62A by 51.6A, 51.65A, 51.6A, THD content by: 14.26%, 14.21%,
14.04% gradual change are as follows: 12.02%, 12.11%, 12.02% significantly reduces.
As shown in Figure 8 for by using the three-phase four-wire system utility power quality control device of the mentioned method of the present invention is compensated to match
Power grid network side current waveform figure, current on line side realize that the compensated current on line side virtual value of three-phase equilibrium standard sineization has substantially
50.71A, 51.15A, 51.23A fade to 75.01 A, 75.95 A, 77.98A, THD content by: 3.77%, 3.75%, 3.84%
Gradual change are as follows: 3.64%, 3.95%, 4.14% to meet the limit value of national standard 5%, and power quality is significantly improved.
It is illustrated in figure 9 load waveform diagram, load current virtual value is respectively as follows: 7.77A, 3.73A, 3.77A before compensating, and deposits
In serious three-phase imbalance, FFT spectrum analysis is carried out by taking A phase current as an example, it is seen that each harmonic content larger especially 3
57 equal low-order harmonics, current waveform Severe distortion.
Figure 10 is controlled to be mentioned network side current waveform figure after method compensates using the present invention using proposed improvement
Current on line side then realizes three-phase equilibrium standard sine, electric current after the three-phase four-wire system utility power quality control device compensation of strategy
Virtual value is respectively as follows: 5.26A, 5.26A, 5.22A, analysis shows each harmonic content significantly reduces, power quality obtains FFT spectrum
To being obviously improved.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as using the various improvement that the inventive concept and technical scheme of the present invention carry out, or not improved direct application
It is within the scope of the present invention in other occasions.
Claims (5)
1. a kind of suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network, it is characterised in that: packet
Include the inverter bridge being made of IGBT, acquisition module and digital signal processor module DSP, the acquisition module respectively with power distribution network
The direct current of system side and inverter bridge surveys connection, and the output end of the acquisition module passes through anti-interference filter and A/D conversion module
Input terminal connection, the output end of the A/D conversion module passes through the input of input interface module and digital signal processor DSP
End connection, the output end of the digital signal processor DSP are connected with the input terminal of drive module, the output of the drive module
End is connected with the control terminal of IGBT in inverter bridge；The digital signal processor DSP also passes through communication module and external man-machine boundary
Face connection.
2. the three-phase four-wire system utility power quality control dress according to claim 1 being suitable for containing distributed power distribution network
It sets, it is characterised in that: further include co-processor module, the co-processor module calculates voltage, the electric current of power distribution network grid entry point
Total harmonic distortion factor, degree of unbalancedness, after being communicated with human-computer interface module by communication module, man-machine interface progress can
Depending on changing.
3. a kind of described in claim 1 suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network
Control method, characterized by the following steps:
1) acquisition module obtains distribution network system side voltage signalu sa 、u sb 、u sc And current signali sa 、i sb 、i sc , obtain simultaneously
DC bus-bar voltage signalU dc , then obtain load currenti la 、i lb 、i lc , and voltage signal and current signal are sent to digital letter
Number processor DSP；
2) voltage signal of distribution network system sideu sa 、u sb 、u sc By digital phase-locked loop, the voltage-phase of grid entry point is calculatedsin θ、cosθ, frequency, and be converted toαβγIn rest frameu sα 、u sβ 、u sγ ；DC bus-bar voltage signalU dc Believe by number
Number processor module DSP calculates DC bus-bar voltage deviation signalΔU dc , and then proportion of utilization-integral element calculate withΔ U dc Corresponding active currenti dref , compensation target is set as comprehensive compensation, i.e., compensates simultaneously idle, humorous in power distribution network
Wave, imbalance enablei qref =0、i oref =0, the phase information of digital phase-locked loop offer is providedsinθ、cosθ, pass through PARK contravariant
It changes, is converted toαβγIn rest framei sαref 、i sβref 、i sγref , maintain the straight of three-phase four-wire system utility power quality control device
It is constant to flow busbar voltage；
3) by the current signal of collected distribution network system sidei sa 、i sb 、i sc , CLARK is passed through by digital signal processor DSP
Transformation, is converted toαβγIn rest framei sα 、i sβ 、i sγ , and by it and reference currenti sαref 、i sβref 、i sγref It compares
Compared with, input of the difference as current loop controller, i.e., are as follows:i αc =i sαref - i sα ,i βc =i sβref - i sβ ,i γc =i sγref - i sγ ；After input current ring controller, calculation process generates modulated signalm α *、m β *、m γ *；
4) to three-phase four-wire system utility power quality control device dynamic response in the case of being fluctuated in view of sudden load change, distribution network voltage
The requirement of speed, by collected load currenti la 、i lb 、i lc , converted, be converted to by CLARK by digital signal processor DSPα βγIn rest framei lα 、i lβ 、i lγ , by load currenti lα 、i lβ 、i lγ And network voltageu sα 、u sβ 、u sγ Make feed-forward process
After obtain modulated signalm α 、m β 、m γ , rightm α 、m β It carries out CLARK inverse transformation and generates modulated signalm a 、m b 、m c ABC phase bridge arm is controlled,m γ For controllingNPhase bridge arm, finally to modulated signalm a 、m b 、m c 、m n It carries out PWM modulation and generates driving signal control IGBT inversion
The conducting of bridge turns off, and three-phase four-wire system utility power quality control device is made to export desired compensation electric current.
4. according to claim 3 be suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network
Control method, it is characterised in that: the current loop controller is by proportional integration PI, vector resonance VR, Repetitive controller RC
Constitute Multiple Models composite controller；Wherein, proportional integration PI control is for enhancing three-phase four-wire system utility power quality control device control
The stability of system processed improves its dynamic response rate simultaneously, and vector resonance VR control is for realizing to fundamental frequency AC compounent and low
The DAZ gene of subharmonic controls, and Repetitive controller RC then can be realized the tracing control to harmonic component, and the Multiple Models are multiple
The transmission function of hop controller are as follows:
(1)。
5. according to claim 4 be suitable for the three-phase four-wire system utility power quality control device containing distributed power distribution network
Control method, it is characterised in that: the governing equation of the feed-forward process is as follows:
(2)。
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