CN103368182B - Modularized multi-machine parallel-connection large-power APF (active power filter) control system and realization method - Google Patents
Modularized multi-machine parallel-connection large-power APF (active power filter) control system and realization method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention discloses a modularized multi-machine parallel-connection large-power APF (active power filter) control system and a realization method. By coordinating an upper layer controller and a lower layer controller, an effect for reasonably allocating the compensative capacity and improving the compensation precision can be realized; the upper layer controller is used for carrying out the coordination and switching control on each power module, for example, the upper layer controller is used for operating and monitoring the quantity of the power modules to be put into use according to a load requirement, numbering the power modules according to a rule and eliminating the switching subharmonic by utilizing the carrier phase shifting; the lower layer controller is used for receiving a compensation order of the upper layer controller and a synchronous signal of a previous sequence number controller and feeding back state information of the power module to the upper layer controller. By adopting the modularized multi-machine parallel-connection large-power APF control system, the compensation capacity of the power module and the computation of an upper layer and a lower layer of the control system are reasonably allocated, the entire system can be enabled to run stably and orderly, the stopping of the entire system caused by the malfunction of one power module can be avoided, and the feasibility and practical value are good.
Description
Technical field
The present invention relates to the high-power APF control system of a kind of modularization multi-machine parallel connection formula and implementation method, belong to applied power electronics technology.
Background technology
Since the twentieth century twenty or thirty age, the gasetron that German uses creates comparatively significantly electric current and voltage distortion in electrical network, and harmonic problem is just subject to people's attention.Harmonic wave derives from the electric equipment with nonlinear characteristic, and fraction, by generations such as the transformer in electrical network, reactors, mainly contains following five classes: 1. power electronic equipment, 2. electric railway, 3. industrial arcing device, the transformer 4. in power distribution network, reactor, 5. civil construction electricity consumption.
Due to the deficiency of traditional passive filter, add the development of power electronic technology, control theory and Digital Signal Processing, the theory of Active Power Filter-APF is suggested and realizes in engineering gradually.The principle of conventional parallel connection type power model extracts harmonic current from load current, produced and this harmonic current equal and opposite in direction, the contrary offset current of phase place, thus make grid side current sinusoidal by compensation arrangement.Because the capacity of power semiconductor and price do not grow proportionately, but increase with exponential curve, for the capacity limitation problem of separate unit Active Power Filter-APF, in order to reach certain compensation effect, its switching frequency can not be too low, thus loss is comparatively large, causes the power that can send to reduce, and reduces switching frequency and directly affect compensation effect.
In order to solve powerful power module design difficulty, there is several scheme at present: 1. by very fast for the switching speed device connection in series-parallel that still capacity is little; 2. many level scheme; 3. multi-machine parallel connection.It is completely constant that the first scheme can allow the topological sum of equipment control, cannot the problem of conducting completely but there is connection in series-parallel device, and this problem constrains the popularization of this kind of method.Second method is applicable to the grid-connected problem of mesohigh.The third method is more a kind of form of current industry spot.If use the method that gradation compensates, namely give each power model filter task by spectrum allocation may, the parameter of modules is not quite similar, and carrys out design power module parameter according to compensation spectrum distribution and load harmonic characteristic.When breaking down for one, the operation of whole system can be affected; When load harmonic changes greatly time, be not easy to expansion and safeguard.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides the high-power APF control system of a kind of modularization multi-machine parallel connection formula and implementation method, whole system can be made reliablely and stablely to run, realize the effective improvement to low-voltage, high-current harmonic pollution source.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
The high-power APF control system of a kind of modularization multi-machine parallel connection formula, comprise top level control device and the full compensating unit of multimachine, the full compensating unit of described multimachine is made up of the power model of some parallel connections, and described power model comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the exchanges data that levels data coordinating method realizes between top level control device and lower floor's controller, levels data coordinating method comprises reception and the loading of harmonic data, and the method can reduce digital system and postpone;
Described top level control device forms compensating instruction electric current according to grid side voltage signal and load-side current signal, and be issued to lower floor's controller of each power model, each power model to be coordinated and switching controls, specifically comprise and according to loading demand, computing and monitoring carried out to the quantity of the power model that needs drop into, power model be numbered, divide into groups and apply carrier phase and eliminate switch subharmonic;
Described lower floor controller receive from top level control device compensating instruction electric current, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, generate pwm pulse, and the state information of power model belonging to feeding back to upper strata controller, the state information of described power model comprises offset current effective value, DC voltage value and fault status information.
Preferably, be one group be numbered needing the power model put into operation according to 4 power models, four power model numberings of same group are respectively 1 ~ 4;
Described top level control device comprises sampling system selftest module, harmonic detecting module, real time data issue module, coordinating control module, switching control module, levels data harmonization module and human-computer interaction module, wherein:
Described sampling system selftest module, for the correctness detecting sampling system of starting shooting;
Described harmonic detecting module, for detecting load-side electric current, generates the compensating instruction current signal for compensating full frequency band;
Described real time data issues module, for sending the offset current of compensating instruction electric current, synchronous each power model to lower floor's controller;
Described coordinating control module, for carrying out computing, monitoring and numbering according to loading demand to needing the quantity of the power model dropped into, and sends synchronous triggering signal to the First power model often organizing power model;
Described switching control module, for carrying out switching control to control system;
Described levels data harmonization module, for coordinating the exchanges data of top level control device and lower floor's control device;
Described human-computer interaction module, for artificially sending control command to this control system or showing this control system state;
Described lower floor controller comprises DC voltage voltage stabilizing control module, current inner loop tracing control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, failure protection module and state feedback module, wherein:
Described DC voltage voltage stabilizing control module, for closed-loop control direct voltage;
Described current inner loop tracing control module, for comparing compensating instruction electric current and bridge arm current to generate duty ratio;
Described carrier signal synchronization module, carrier synchronization signal is sent by the First power model in same group of power model, sent by the power model power model of numbering to the next one of a upper numbering, be used for the carrier wave of each power model in synchronous whole control system; The number order of described same group of power model is 1,2,3,4 circulations;
Described SVPWM modulation module, sends pulse signal according to duty ratio, makes PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, is no more than threshold value for monitoring the DC voltage of power model, bridge arm current peak value and effective value;
Described failure protection module, for monitoring the fault-signal that power semiconductor drives;
Described state feedback module, for by the status information feedback of power model to top level control device, the state information of described power model comprises offset current effective value, DC voltage value and fault status information.
Preferably, all Fiber connection is passed through between described lower floor controller and lower floor's controller, between lower floor's controller and top level control device.
An implementation method for the high-power APF control system of modularization multi-machine parallel connection formula, comprising:
(1) computing and monitoring is carried out according to loading demand to needing the quantity of the power model dropped into: set load current as I
lh, the specified offset current of every platform power model is I
aPF, the quantity that choosing needs the power model dropped into is k+1, makes
kI
APF≤I
Lh≤(k+1)I
APF；
When loading demand changes or lower floor's controller failure cuts machine, top level control device real-time update I
lhvalue, and recalculate above formula;
(2) be numbered power model: be one group to needing the power model put into operation according to 4 power models and be numbered, four power model numberings of same group are respectively 1 ~ 4, do not need the power model numbering unification put into operation to be 0; Issue numbering to each power model and drop into order, receive drop into order, numbering be not 0 power model first carry out carrier synchronization according to numbering, restart running status;
(3) apply carrier phase and eliminate switch subharmonic: the power model phase angle being numbered 1 is 0 °, and the power model phase angle being numbered 2 is 180 °, and the power model phase angle being numbered 3 is 90 °, and the power model phase angle being numbered 4 is 270 °; Each cycle, when starting, sends carrier synchronization signal by the First power model in same group of power model, and the power model of being numbered to the next one by the power model of a upper numbering sends, the synchronously carrier wave of other each power models; The number order of described same group of power model is 1,2,3,4 circulations;
(4) switching controls, and comprises and puts into operation strategy and cut machine strategy:
The described strategy that puts into operation is: when 1. certain power model needs to put into operation, all must send request to upper strata controller, only permitted, this power model just can put into operation, and now top level control device needs renumber each power model and upgrade current stabilizing factor; 2. after power model receives enabling signal, need first to close contactor, rectifier boost is to rated value, then ready signal is sent to upper strata controller, top level control device is by the time sequencing of the ready signal received, first process is numbered to the power model sending ready signal the earliest, until process terminates the power model that the rear reprocessing next one sends ready signal; 3. when all power models of specifying are all ready time, compensating instruction electric current assigned by top level control device, and the power model of specifying starts after receiving compensating instruction electric current to compensate and to the state information of upper strata controller feedback power module; 4. top level control device completes after compensating instruction electric current assigns, and continues monitoring grid side voltage signal and load-side current signal;
Described machine strategy of cutting is: 1. when power model detects faults itself time, first cut machine and then fault message is beamed back top level control device, top level control device feeds back to host computer by man-machine interactive system fault-signal, then puts into operation with alternative faulty equipment according to the strategy that puts into operation by new power model; If 2. top level control device detects that load reduces, the power model quantity run has exceeded the power model quantity needed for load, so will send cutting machine signal to unnecessary power model, power model cuts off out system after receiving cutting machine signal, and beam back top level control device cutting machine information, top level control device renumbers remaining power model;
(5) levels data harmonization: when carrier synchronization signal triggers, top level control device gathers load-side current signal and calculates harmonic data, is issued to each lower floor controller immediately; Meanwhile, each lower floor controller interrupt latency data distributing, generates pwm pulse, and is loaded into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
In described (5), if top level control device carrier wave is consistent with the power model carrier wave being numbered 1, top level control device is loaded into modulating wave data when trough, so: the power model being numbered 1 is loaded into modulating wave data when crest, postpones half and claps; The power model being numbered 2 is loaded into modulating wave data when trough, postpones half and claps; The power model being numbered 3 is loaded into modulating wave data when trough, postpones 1/4 and claps; The power model being numbered 4 is loaded into modulating wave data when crest, postpones 1/4 and claps.
Beneficial effect: the high-power APF control system of modularization multi-machine parallel connection formula provided by the invention and implementation method, there is following advantage in prior art of comparing:
1, autgmentability is strong, and each power model two optical fiber are connected with top level control device, and the power model that arbitrary power model and front and back are numbered respectively uses a fiber interconnect, plays the effect of carrier synchronization, substantially reduces the burden of top level control device;
2, good stability, can not make because of the fault of certain power model whole control system shut down, even if also can start control for subsequent use when top level control device breaks down, substantially increase the reliability of control system;
3, because harmonic data is that top level control device is unifiedly calculated and issues, the operand of lower floor's controller is greatly reduced;
4, applicable hot-swappable, be easy to expansion;
5, adopt carrier phase technology, effectively can suppress the ripple exporting offset current.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is the structural representation of lower floor's controller;
Fig. 3 is the schematic flow sheet of the inventive method;
Fig. 4 is power model coding rule schematic diagram;
Fig. 5 is carrier signal synchronization rules schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, for the high-power APF control system of a kind of modularization multi-machine parallel connection formula, comprise top level control device and the full compensating unit of multimachine, the full compensating unit of described multimachine is made up of the power model of some parallel connections, and described power model comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the exchanges data that levels data coordinating method realizes between top level control device and lower floor's controller, levels data coordinating method comprises reception and the loading of harmonic data, and the method can reduce digital system and postpone;
Described top level control device forms compensating instruction electric current according to grid side voltage signal and load-side current signal, and be issued to lower floor's controller of each power model, each power model to be coordinated and switching controls, specifically comprise and according to loading demand, computing and monitoring carried out to the quantity of the power model that needs drop into, power model be numbered, divide into groups and apply carrier phase and eliminate switch subharmonic;
Described lower floor controller receive from top level control device compensating instruction electric current, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, by gathering three-phase voltage signal and bridge arm current signal generation pwm pulse, and the state information of power model belonging to feeding back to upper strata controller, the state information of described power model comprises offset current effective value, DC voltage value and fault status information.
Low-voltage, high-current harmonic load is compensated by multiple power model parallel operation, and the principle of distributing according to power averaging is one group with 4 power models, uses carrier phase technology to reduce to flow into the ripple of electrical network in group; Be one group to needing the power model put into operation according to 4 power models to be numbered, four power model numberings of same group are respectively 1 ~ 4;
As shown in Figure 1, described top level control device comprises sampling system selftest module, harmonic detecting module, real time data issue module, coordinating control module, switching control module, levels data harmonization module and human-computer interaction module, wherein:
Described sampling system selftest module, for the correctness detecting sampling system of starting shooting;
Described harmonic detecting module, for detecting load-side electric current, generates the compensating instruction current signal for compensating full frequency band;
Described real time data issues module, for sending the offset current of compensating instruction electric current, synchronous each power model to lower floor's controller;
Described coordinating control module, for carrying out computing, monitoring and numbering according to loading demand to needing the quantity of the power model dropped into, and sends synchronous triggering signal to the First power model often organizing power model;
Described switching control module, for carrying out switching control to control system;
Described levels data harmonization module, for coordinating the exchanges data of top level control device and lower floor's control device;
Described human-computer interaction module, for artificially sending control command to this control system or showing this control system state;
As shown in Figure 2, described lower floor controller comprises DC voltage voltage stabilizing control module, current inner loop tracing control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, failure protection module and state feedback module, wherein:
Described DC voltage voltage stabilizing control module, for closed-loop control direct voltage;
Described current inner loop tracing control module, for comparing compensating instruction electric current and bridge arm current to generate duty ratio;
Described carrier signal synchronization module, carrier synchronization signal is sent by the First power model in same group of power model, sent by the power model power model of numbering to the next one of a upper numbering, be used for the carrier wave of each power model in synchronous whole control system; The number order of described same group of power model is 1,2,3,4 circulations;
Described SVPWM modulation module, sends pulse signal according to duty ratio, makes PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, is no more than threshold value for monitoring the DC voltage of power model, bridge arm current peak value and effective value; Guaranteed output module safety runs, and prevents fault from worsening;
Described failure protection module, for monitoring the fault-signal that power semiconductor drives;
Described state feedback module, for by the status information feedback of power model to top level control device, the state information of described power model comprises offset current effective value, DC voltage value and fault status information.
All by Fiber connection between described lower floor controller and lower floor's controller, between lower floor's controller and top level control device, improve the efficiency of Signal transmissions, ensure the quality of synchronous carrier signal.
An implementation method for the high-power APF control system of modularization multi-machine parallel connection formula, comprising:
(1) computing and monitoring is carried out according to loading demand to needing the quantity of the power model dropped into: set load current as I
lh, the specified offset current of every platform power model is I
aPF, the quantity that choosing needs the power model dropped into is k+1, makes
kI
APF≤I
Lh≤(k+1)I
APF；
When loading demand changes or lower floor's controller failure cuts machine, top level control device real-time update I
lhvalue, and recalculate above formula;
(2) be numbered power model: be one group to needing the power model put into operation according to 4 power models and be numbered, four power model numberings of same group are respectively 1 ~ 4, do not need the power model numbering unification put into operation to be 0; Issue numbering to each power model and drop into order, receive drop into order, numbering be not 0 power model first carry out carrier synchronization according to numbering, restart running status;
(3) apply carrier phase and eliminate switch subharmonic: the power model phase angle being numbered 1 is 0 °, and the power model phase angle being numbered 2 is 180 °, and the power model phase angle being numbered 3 is 90 °, and the power model phase angle being numbered 4 is 270 °; Each cycle, when starting, sends carrier synchronization signal by the First power model in same group of power model, and the power model of being numbered to the next one by the power model of a upper numbering sends, the synchronously carrier wave of other each power models; The number order of described same group of power model is 1,2,3,4 circulations;
(4) switching controls, and comprises and puts into operation strategy and cut machine strategy:
The described strategy that puts into operation is: when 1. certain power model needs to put into operation, all must send request to upper strata controller, only permitted, this power model just can put into operation, and now top level control device needs renumber each power model and upgrade current stabilizing factor; 2. after power model receives enabling signal, need first to close contactor, rectifier boost is to rated value, then ready signal is sent to upper strata controller, top level control device is by the time sequencing of the ready signal received, first process is numbered to the power model sending ready signal the earliest, until process terminates the power model that the rear reprocessing next one sends ready signal; 3. when all power models of specifying are all ready time, compensating instruction electric current assigned by top level control device, and the power model of specifying starts after receiving compensating instruction electric current to compensate and to the state information of upper strata controller feedback power module; 4. top level control device completes after compensating instruction electric current assigns, and continues monitoring grid side voltage signal and load-side current signal;
Described machine strategy of cutting is: 1. when power model detects faults itself time, first cut machine and then fault message is beamed back top level control device, top level control device feeds back to host computer by man-machine interactive system fault-signal, then puts into operation with alternative faulty equipment according to the strategy that puts into operation by new power model; If 2. top level control device detects that load reduces, the power model quantity run has exceeded the power model quantity needed for load, so will send cutting machine signal to unnecessary power model, power model cuts off out system after receiving cutting machine signal, and beam back top level control device cutting machine information, top level control device renumbers remaining power model;
(5) levels data harmonization: when carrier synchronization signal triggers, top level control device gathers load-side current signal and calculates harmonic data, is issued to each lower floor controller immediately; Meanwhile, each lower floor controller interrupt latency data distributing, generates pwm pulse, and is loaded into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
In described (5), if top level control device carrier wave is consistent with the power model carrier wave being numbered 1, top level control device is loaded into modulating wave data when trough, so: the power model being numbered 1 is loaded into modulating wave data when crest, postpones half and claps; The power model being numbered 2 is loaded into modulating wave data when trough, postpones half and claps; The power model being numbered 3 is loaded into modulating wave data when trough, postpones 1/4 and claps; The power model being numbered 4 is loaded into modulating wave data when crest, postpones 1/4 and claps.
After the First power model often organizing power model sends synchronizing signal, then to upper strata controller request harmonic data, top level control device gathers load current, computing harmonic current be issued to lower floor's controller, lower floor controller reads harmonic data and generates modulating wave and data are loaded into when the crest in next cycle or trough, and the pwm pulse of formation produces offset current to electrical network.Control system is started shooting the correctness of first detection system sampling, determines to drop into power model quantity, after online updating current stabilizing factor, load harmonic is on average handed down to the power model run by computational load harmonic current effective value.If load change or power model fault, so top level control device can upgrade current stabilizing factor in time to guarantee operational efficiency.
As shown in Figure 3, for based on concrete methods of realizing schematic diagram in of the present invention, after control system start, the harmonic current in 3 ~ 5 cycles of harmonic detecting module acquires also calculates its effective value I
lhthe quantity of power demand module is judged with this, carry out power model numbering on demand afterwards, 1 ~ 4, number order is near load, the label not needing the power model run is 0, then judges whether the quantity run at present meets the numbering situation of previous step, last real-time update carrier phase.
Fig. 4 illustrates the coding rule of power model, and whole system is totally 8 power models, counting from development side, second disorderly closedown, 8th for subsequent use, 6 operations, and successively with 1 ~ 4 numbering, the initial phase of each power model is: No. 10 °, No. 2 180 °, No. 39 °, No. 4 270 °; Carrier phase technology is used to offset switch subharmonic.
Fig. 5 illustrates carrier synchronization point and is loaded into the point of modulation value.Carrier synchronization signal is when trough triggers, and top level control device gathers load current and calculates harmonic data, is issued to described lower floor controller immediately; Each lower floor controller interrupt latency data distributing simultaneously, generates modulation value, and is loaded into when next crest, and power model DDEL half is clapped.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the high-power APF control system of modularization multi-machine parallel connection formula, it is characterized in that: comprise top level control device and the full compensating unit of multimachine, the full compensating unit of described multimachine is made up of the power model of some parallel connections, and described power model comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the exchanges data that levels data coordinating method realizes between top level control device and lower floor's controller, levels data coordinating method comprises reception and the loading of harmonic data;
Described top level control device forms compensating instruction electric current according to grid side voltage signal and load-side current signal, and be issued to lower floor's controller of each power model, each power model to be coordinated and switching controls, specifically comprise and according to loading demand, computing and monitoring carried out to the quantity of the power model that needs drop into, power model be numbered, divide into groups and apply carrier phase and eliminate switch subharmonic;
Described lower floor controller receive from top level control device compensating instruction electric current, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, generate pwm pulse, and the state information of power model belonging to feeding back to upper strata controller, the state information of described power model comprises offset current effective value, DC voltage value and fault status information;
Be one group to needing the power model put into operation according to 4 power models to be numbered, four power model numberings of same group are respectively 1 ~ 4;
Described top level control device comprises sampling system selftest module, harmonic detecting module, real time data issue module, coordinating control module, switching control module, levels data harmonization module and human-computer interaction module, wherein:
Described sampling system selftest module, for the correctness detecting sampling system of starting shooting;
Described harmonic detecting module, for detecting load-side electric current, generates the compensating instruction current signal for compensating full frequency band;
Described real time data issues module, for sending the offset current of compensating instruction electric current, synchronous each power model to lower floor's controller;
Described coordinating control module, for carrying out computing, monitoring and numbering according to loading demand to needing the quantity of the power model dropped into, and sends synchronous triggering signal to the First power model often organizing power model;
Described switching control module, for carrying out switching control to control system;
Described levels data harmonization module, for coordinating the exchanges data between top level control device and lower floor's controller;
Described human-computer interaction module, for artificially sending control command to this control system or showing this control system state;
Described lower floor controller comprises DC voltage voltage stabilizing control module, current inner loop tracing control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, failure protection module and state feedback module, wherein:
Described DC voltage voltage stabilizing control module, for closed-loop control direct voltage;
Described current inner loop tracing control module, for comparing compensating instruction electric current and bridge arm current to generate duty ratio;
Described carrier signal synchronization module, carrier synchronization signal is sent by the First power model in same group of power model, sent by the power model power model of numbering to the next one of a upper numbering, be used for the carrier wave of each power model in synchronous whole control system; The number order of described same group of power model is 1,2,3,4 circulations;
Described SVPWM modulation module, sends pulse signal according to duty ratio, makes PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, is no more than threshold value for monitoring the DC voltage of power model, bridge arm current peak value and effective value;
Described failure protection module, for monitoring the fault-signal that power semiconductor drives;
Described state feedback module, for by the status information feedback of power model to top level control device, the state information of described power model comprises offset current effective value, DC voltage value and fault status information.
2. the high-power APF control system of modularization multi-machine parallel connection formula according to claim 1, is characterized in that: all pass through Fiber connection between described lower floor controller and lower floor's controller, between lower floor's controller and top level control device.
3. an implementation method for the high-power APF control system of modularization multi-machine parallel connection formula, is characterized in that: comprising:
(1) computing and monitoring is carried out according to loading demand to needing the quantity of the power model dropped into: set load current as I
lh, the specified offset current of every platform power model is I
aPF, the quantity that choosing needs the power model dropped into is k+1, makes
kI
APF≤I
Lh≤(k+1)I
APF；
When loading demand changes or lower floor's controller failure cuts machine, top level control device real-time update I
lhvalue, and recalculate above formula;
(2) be numbered power model: be one group to needing the power model put into operation according to 4 power models and be numbered, four power model numberings of same group are respectively 1 ~ 4, do not need the power model numbering unification put into operation to be 0; Issue numbering to each power model and drop into order, receive drop into order, numbering be not 0 power model first carry out carrier synchronization according to numbering, restart running status;
(3) apply carrier phase and eliminate switch subharmonic: the power model phase angle being numbered 1 is 0 °, and the power model phase angle being numbered 2 is 180 °, and the power model phase angle being numbered 3 is 90 °, and the power model phase angle being numbered 4 is 270 °; Each cycle, when starting, sends carrier synchronization signal by the First power model in same group of power model, and the power model of being numbered to the next one by the power model of a upper numbering sends, the synchronously carrier wave of other each power models; The number order of described same group of power model is 1,2,3,4 circulations;
(4) switching controls, and comprises and puts into operation strategy and cut machine strategy:
The described strategy that puts into operation is: when 1. certain power model needs to put into operation, all must send request to upper strata controller, only permitted, this power model just can put into operation, and now top level control device needs renumber each power model and upgrade current stabilizing factor; 2. after power model receives enabling signal, need first to close contactor, rectifier boost is to rated value, then ready signal is sent to upper strata controller, top level control device is by the time sequencing of the ready signal received, first process is numbered to the power model sending ready signal the earliest, until process terminates the power model that the rear reprocessing next one sends ready signal; 3. when all power models of specifying are all ready time, compensating instruction electric current assigned by top level control device, and the power model of specifying starts after receiving compensating instruction electric current to compensate and to the state information of upper strata controller feedback power module; 4. top level control device completes after compensating instruction electric current assigns, and continues monitoring grid side voltage signal and load-side current signal;
Described machine strategy of cutting is: 1. when power model detects faults itself time, first cut machine and then fault message is beamed back top level control device, top level control device feeds back to host computer by man-machine interactive system fault-signal, then puts into operation with alternative faulty equipment according to the strategy that puts into operation by new power model; If 2. top level control device detects that load reduces, the power model quantity run has exceeded the power model quantity needed for load, so will send cutting machine signal to unnecessary power model, power model cuts off out system after receiving cutting machine signal, and beam back top level control device cutting machine information, top level control device renumbers remaining power model.
4. the implementation method of the high-power APF control system of modularization multi-machine parallel connection formula according to claim 3, it is characterized in that: also comprise: (5) levels data harmonization: when carrier synchronization signal triggers, top level control device gathers load-side current signal and calculates harmonic data, is issued to each lower floor controller immediately; Meanwhile, each lower floor controller interrupt latency data distributing, generates pwm pulse, and is loaded into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
5. the implementation method of the high-power APF control system of modularization multi-machine parallel connection formula according to claim 4, it is characterized in that: in described (5), if top level control device carrier wave is consistent with the power model carrier wave being numbered 1, top level control device is loaded into modulating wave data when trough, so: the power model being numbered 1 is loaded into modulating wave data when crest, postpone half to clap; The power model being numbered 2 is loaded into modulating wave data when trough, postpones half and claps; The power model being numbered 3 is loaded into modulating wave data when trough, postpones 1/4 and claps; The power model being numbered 4 is loaded into modulating wave data when crest, postpones 1/4 and claps.
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