CN103368182A - 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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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 the power electronics application technology.
Background technology
Since the twentieth century twenty or thirty age, the gasetron that the German uses has produced comparatively significantly electric current and voltage distortion in electrical network, and harmonic problem just is subject to people's attention.Harmonic wave derives from the electric equipment with nonlinear characteristic, and fraction mainly contains following five classes by generations such as the transformer in the electrical network, reactors: 1. power electronic equipment, 2. electric railway, 3. industrial arcing device, the 4. transformer in the power distribution network, reactor, 5. civil construction electricity consumption.
Owing 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 is to extract harmonic current from load current, is produced and this harmonic current equal and opposite in direction single spin-echo offset current, thereby so that grid side current sinusoidal by compensation arrangement.Because capacity and the price of power semiconductor do not grow proportionately, but increase with exponential curve, capacity limitation problem for the separate unit Active Power Filter-APF, in order to reach certain compensation effect, its switching frequency can not be too low, thereby loss is larger, and the power that causes sending reduces, and directly affects compensation effect and reduce switching frequency.
In order to solve powerful power module design difficulty, several schemes are arranged at present: 1. with the very fast still little device connection in series-parallel of capacity of switching speed; 2. many level scheme; 3. multi-machine parallel connection.The first scheme can allow the topological sum control of equipment fully constant, but has the fully problem of conducting of connection in series-parallel device, and this problem has restricted the popularization of this kind method.Second method is applicable to the mesohigh problem that is incorporated into the power networks.The third method is more a kind of form that present industry spot is used.If use the method for gradation compensation, namely give each power model filter task by spectrum allocation may, the parameter of modules is not quite similar, and comes the design power module parameter according to compensation spectrum distribution and load harmonic characterisitic.When breaking down for one, can affect the operation of whole system; When the load harmonic wave changes greatly, be not easy to expansion and maintenance.
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, can so that whole system is reliablely and stablely moved, realize the effective improvement to the 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 the full compensating unit of upper strata controller and multimachine, the full compensating unit of described multimachine is made of the power model of some parallel connections, and described power cell comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the levels data coordinating method to realize that exchanges data between upper strata controller and the lower floor's controller, levels data coordinating method comprise the reception of harmonic data and be written into, the method can reduce digital system and postpone;
Described upper strata controller forms the 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 is coordinated and switching control, specifically comprised according to loading demand the quantity of the power model of needs input is carried out computing and monitoring, power model is numbered, divides into groups and uses carrier phase and eliminate the switch subharmonic;
Described lower floor controller receives compensating instruction from the upper strata controller, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, generate pwm pulse, and under the upper strata controller feedback state information of power model, the state information of described power model comprises offset current effective value, dc voltage value and fault status information.
Preferably, the power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4;
Described upper strata controller comprises that sampling system selftest module, harmonic wave detection module, real time data issue module, coordinating control module, switching control module, levels data Coordination module and human-computer interaction module, wherein:
Described sampling system selftest module is used for the correctness that start detects sampling system;
Described harmonic wave detection module for detection of the load-side electric current, generates the compensating instruction current signal that is used for the compensation full frequency band;
Described real time data issues module, is used for sending instruction, the synchronous offset current of each power model to lower floor's controller;
Described coordinating control module is used for according to loading demand the quantity of the power model of needs input being carried out computing, monitoring and numbering, and sends synchronous triggering signal to the First power model of every group of power model;
Described switching control module is used for control system is carried out switching control;
Described levels data Coordination module is for the exchanges data of coordinating upper strata controller and lower floor's control device;
Described human-computer interaction module is used for artificially sending instruction or showing this control system state to this control system;
Described lower floor controller comprises dc voltage voltage stabilizing control module, current inner loop tracking control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, error protection module and state feedback module, wherein:
Described dc voltage voltage stabilizing control module is used for the closed-loop control direct voltage;
Described current inner loop is followed the tracks of control module, is used for comparing compensating instruction electric current and brachium pontis electric current to generate duty ratio;
Described carrier signal synchronization module, begin to send the carrier synchronization signal by the First power model in the same group of power model, sent by the power model of the upper numbering power model to next one numbering, be used for the carrier wave of each power model in the 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 the PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, the dc voltage, brachium pontis current peak and the effective value that are used for the monitoring power model are no more than threshold value;
Described error protection module is used for the fault-signal that the monitoring power semiconductor drives;
Described state feedback module is used for status information feedback with power model to the upper strata controller, and the state information of described power model comprises offset current effective value, dc voltage value and fault status information.
Preferably, between described lower floor's controller and the lower floor's controller, all connect by optical fiber between lower floor's controller and the upper strata controller.
The high-power APF system realization of a kind of modularization multi-machine parallel connection formula method comprises:
(1) according to loading demand the quantity of the power model of needs input is carried out computing and monitoring: establishing load current is I
Lh, the specified offset current of every power model is I
APF, the quantity of choosing the power model that needs input is k+1, so that
kI
APF≤I
Lh≤(k+1)I
APFk；
When loading demand changes or lower floor's controller failure when cutting machine upper strata controller real-time update I
LhValue, and recomputate following formula;
(2) power model is numbered: the power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4, and the power model numbering unification that does not need to put into operation is 0; Issue numbering and drop into order to each power model, receive drop into order, numbering is not that 0 power model carries out carrier synchronization according to numbering first, restarts running status;
(3) use carrier phase and eliminate the switch subharmonic: being numbered 1 power model phase angle is 0 °, and being numbered 2 power model phase angle is 180 °, and being numbered 3 power model phase angle is 90 °, and being numbered 4 power model phase angle is 270 °; Each cycle begins to send the carrier synchronization signal by the First power model in the same group of power model when beginning, and the power model of being numbered to the next one by the power model of a upper numbering sends, synchronously the 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 control comprises and puts into operation strategy and cut the machine strategy:
The described strategy that puts into operation is: when 1. certain power model need to put into operation, all must send request to the upper strata controller, only permitted, this power model just can put into operation, and the upper strata controller need to renumber and upgraded current stabilizing factor each power model this moment; 2. power model is received after the enabling signal, need at first closed contactor, rectification boosts to rated value, then send ready signal to the upper strata controller, the upper strata controller is by the time sequencing of the ready signal that receives, at first the power model that sends the earliest ready signal is numbered processing, until processing is processed the next power model that sends ready signal after finishing again; 3. when the power model of all appointments was all ready, the upper strata controller was assigned compensating instruction, and the power model of appointment is received and begun after the compensating instruction to compensate and to the state information of upper strata controller feedback power module; 4. after the upper strata controller is finished compensating instruction and assigned, continue monitoring grid side voltage signal and load-side current signal;
The described machine strategy of cutting is: 1. when power model detects faults itself, cut first machine and then fault message is beamed back the upper strata controller, the upper strata controller feeds back to host computer to fault-signal by man-machine interactive system, puts new power model into operation to substitute faulty equipment according to the strategy that puts into operation again; If 2. the upper strata controller detects load and reduces, the power model quantity of having moved has surpassed the required power model quantity of load, will send cutting machine signal to unnecessary power model so, power model cuts off out system after receiving cutting machine signal, and beam back the upper strata controller cutting machine information, the upper strata controller renumbers remaining power model;
(5) the levels data are coordinated: when the carrier synchronization signal triggered, the upper strata controller gathered the load-side current signal and calculates harmonic data, is issued to immediately each lower floor's controller; Simultaneously, each lower floor's controller interrupt latency data distributing generates pwm pulse, and is written into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
In described (5), if upper strata controller carrier wave is consistent with the power model carrier wave that is numbered 1, the upper strata controller is written into the modulating wave data when trough, so: be numbered 1 power model and be written into the modulating wave data when crest, postpone half and clap; Be numbered 2 power model and when trough, be written into the modulating wave data, postpone half and clap; Be numbered 3 power model and when trough, be written into the modulating wave data, postpone 1/4 and clap; Be numbered 4 power model and when crest, be written into the modulating wave data, postpone 1/4 and clap.
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 the prior art of comparing:
1, autgmentability is strong, and each power model links to each other with the upper strata controller with two optical fiber, and each is interconnected with an optical fiber for the power model of arbitrary power model and front and back numbering, plays the effect of carrier synchronization, has greatly reduced the burden of upper strata controller;
2, good stability can because of the fault of certain power model so that whole control system is shut down, even can start control for subsequent use when the upper strata controller breaks down, not improve the reliability of control system greatly yet;
3, owing to harmonic data is that the upper strata controller is unifiedly calculated and issued, greatly reduced the operand of lower floor's controller;
4, suitable hot-swappable, be easy to expansion;
5, adopt the carrier phase technology, ripple that can establishment output offset current.
Description of drawings
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, be the high-power APF control system of a kind of modularization multi-machine parallel connection formula, comprise the full compensating unit of upper strata controller and multimachine, the full compensating unit of described multimachine is made of the power model of some parallel connections, and described power cell comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the levels data coordinating method to realize that exchanges data between upper strata controller and the lower floor's controller, levels data coordinating method comprise the reception of harmonic data and be written into, the method can reduce digital system and postpone;
Described upper strata controller forms the 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 is coordinated and switching control, specifically comprised according to loading demand the quantity of the power model of needs input is carried out computing and monitoring, power model is numbered, divides into groups and uses carrier phase and eliminate the switch subharmonic;
Described lower floor controller receives compensating instruction from the upper strata controller, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, generate pwm pulse by gathering three-phase voltage signal and brachium pontis current signal, and under the upper strata controller feedback state information of power model, the state information of described power model comprises offset current effective value, dc voltage value and fault status information.
The low-voltage, high-current harmonic load is compensated by a plurality of power model parallel operation, according to the principle that power averaging distributes, take 4 power models as one group, uses the carrier phase technology to reduce to flow into the ripple of electrical network in the group; The power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4;
As shown in Figure 1, described upper strata controller comprises that sampling system selftest module, harmonic wave detection module, real time data issue module, coordinating control module, switching control module, levels data Coordination module and human-computer interaction module, wherein:
Described sampling system selftest module is used for the correctness that start detects sampling system;
Described harmonic wave detection module for detection of the load-side electric current, generates the compensating instruction current signal that is used for the compensation full frequency band;
Described real time data issues module, is used for sending instruction, the synchronous offset current of each power model to lower floor's controller;
Described coordinating control module is used for according to loading demand the quantity of the power model of needs input being carried out computing, monitoring and numbering, and sends synchronous triggering signal to the First power model of every group of power model;
Described switching control module is used for control system is carried out switching control;
Described levels data Coordination module is for the exchanges data of coordinating upper strata controller and lower floor's control device;
Described human-computer interaction module is used for artificially sending instruction or showing this control system state to this control system;
As shown in Figure 2, described lower floor controller comprises dc voltage voltage stabilizing control module, current inner loop tracking control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, error protection module and state feedback module, wherein:
Described dc voltage voltage stabilizing control module is used for the closed-loop control direct voltage;
Described current inner loop is followed the tracks of control module, is used for comparing compensating instruction electric current and brachium pontis electric current to generate duty ratio;
Described carrier signal synchronization module, begin to send the carrier synchronization signal by the First power model in the same group of power model, sent by the power model of the upper numbering power model to next one numbering, be used for the carrier wave of each power model in the 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 the PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, the dc voltage, brachium pontis current peak and the effective value that are used for the monitoring power model are no more than threshold value; The safe operation of guaranteed output module prevents that fault from worsening;
Described error protection module is used for the fault-signal that the monitoring power semiconductor drives;
Described state feedback module is used for status information feedback with power model to the upper strata controller, and the state information of described power model comprises offset current effective value, dc voltage value and fault status information.
Between described lower floor controller and the lower floor's controller, all connect by optical fiber between lower floor's controller and the upper strata controller, improve the efficient of signal transmission, guarantee the quality of synchronous carrier signal.
The high-power APF system realization of a kind of modularization multi-machine parallel connection formula method comprises:
(1) according to loading demand the quantity of the power model of needs input is carried out computing and monitoring: establishing load current is I
Lh, the specified offset current of every power model is I
APF, the quantity of choosing the power model that needs input is k+1, so that
kI
APF≤I
Lh≤(k+1)I
APFk；
When loading demand changes or lower floor's controller failure when cutting machine upper strata controller real-time update I
LhValue, and recomputate following formula;
(2) power model is numbered: the power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4, and the power model numbering unification that does not need to put into operation is 0; Issue numbering and drop into order to each power model, receive drop into order, numbering is not that 0 power model carries out carrier synchronization according to numbering first, restarts running status;
(3) use carrier phase and eliminate the switch subharmonic: being numbered 1 power model phase angle is 0 °, and being numbered 2 power model phase angle is 180 °, and being numbered 3 power model phase angle is 90 °, and being numbered 4 power model phase angle is 270 °; Each cycle begins to send the carrier synchronization signal by the First power model in the same group of power model when beginning, and the power model of being numbered to the next one by the power model of a upper numbering sends, synchronously the 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 control comprises and puts into operation strategy and cut the machine strategy:
The described strategy that puts into operation is: when 1. certain power model need to put into operation, all must send request to the upper strata controller, only permitted, this power model just can put into operation, and the upper strata controller need to renumber and upgraded current stabilizing factor each power model this moment; 2. power model is received after the enabling signal, need at first closed contactor, rectification boosts to rated value, then send ready signal to the upper strata controller, the upper strata controller is by the time sequencing of the ready signal that receives, at first the power model that sends the earliest ready signal is numbered processing, until processing is processed the next power model that sends ready signal after finishing again; 3. when the power model of all appointments was all ready, the upper strata controller was assigned compensating instruction, and the power model of appointment is received and begun after the compensating instruction to compensate and to the state information of upper strata controller feedback power module; 4. after the upper strata controller is finished compensating instruction and assigned, continue monitoring grid side voltage signal and load-side current signal;
The described machine strategy of cutting is: 1. when power model detects faults itself, cut first machine and then fault message is beamed back the upper strata controller, the upper strata controller feeds back to host computer to fault-signal by man-machine interactive system, puts new power model into operation to substitute faulty equipment according to the strategy that puts into operation again; If 2. the upper strata controller detects load and reduces, the power model quantity of having moved has surpassed the required power model quantity of load, will send cutting machine signal to unnecessary power model so, power model cuts off out system after receiving cutting machine signal, and beam back the upper strata controller cutting machine information, the upper strata controller renumbers remaining power model;
(5) the levels data are coordinated: when the carrier synchronization signal triggered, the upper strata controller gathered the load-side current signal and calculates harmonic data, is issued to immediately each lower floor's controller; Simultaneously, each lower floor's controller interrupt latency data distributing generates pwm pulse, and is written into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
In described (5), if upper strata controller carrier wave is consistent with the power model carrier wave that is numbered 1, the upper strata controller is written into the modulating wave data when trough, so: be numbered 1 power model and be written into the modulating wave data when crest, postpone half and clap; Be numbered 2 power model and when trough, be written into the modulating wave data, postpone half and clap; Be numbered 3 power model and when trough, be written into the modulating wave data, postpone 1/4 and clap; Be numbered 4 power model and when crest, be written into the modulating wave data, postpone 1/4 and clap.
The First power model of every group of power model sends after the synchronizing signal, then to upper strata controller request harmonic data, the upper strata controller gathers load current, computing harmonic current and is issued to lower floor's controller, lower floor's controller reads harmonic data and generates modulating wave and data are written into when the crest in next cycle or the trough, and the pwm pulse of formation produces offset current to electrical network.The start shooting correctness of first detection system sampling of control system is determined input power model quantity by computational load harmonic current effective value, after the online updating current stabilizing factor, the load harmonic wave on average is handed down to the power model that is moving.If load change or power model fault, the controller current stabilizing factor that can upgrade in time in upper strata is guaranteed operational efficiency so.
As shown in Figure 3, for based on concrete methods of realizing schematic diagram in of the present invention, after the control system start, the harmonic current in 3～5 cycles of harmonic wave detection module collection also calculates its effective value I
LhJudge the quantity of power demand module with this, carry out on demand afterwards the power model numbering, 1～4, number order is near load, not needing the label of the power model that moves is 0, judges then whether the quantity of at present operation meets the numbering situation of previous step, last real-time update carrier phase.
Fig. 4 example the coding rule of power model, whole system totally 8 power models, from the development side begin the counting, second disorderly closedown, the 8th is for subsequent use, 6 operations, successively with 1～4 the numbering, the initial phase of each power model is: No. 10 °, No. 2 180 °, No. 39 °, No. 4 270 °; Use the carrier phase technology to offset the switch subharmonic.
Fig. 5 example carrier synchronization point and be written into the point of modulation value.The carrier synchronization signal is when trough triggers, and the upper strata controller gathers load current and calculates harmonic data, is issued to immediately described lower floor controller; Each lower floor's controller interrupt latency data distributing generates modulation value, and is written into when next crest simultaneously, and power model DDEL half is clapped.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle 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 (6)
1. high-power APF control system of modularization multi-machine parallel connection formula, it is characterized in that: comprise the full compensating unit of upper strata controller and multimachine, the full compensating unit of described multimachine is made of the power model of some parallel connections, and described power cell comprises lower floor's controller and three-phase three-wire system PWM converter; Utilize the exchanges data between levels data coordinating method realization upper strata controller and the lower floor's controller, the levels data coordinating method comprises the reception of harmonic data and is written into;
Described upper strata controller forms the 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 is coordinated and switching control, specifically comprised according to loading demand the quantity of the power model of needs input is carried out computing and monitoring, power model is numbered, divides into groups and uses carrier phase and eliminate the switch subharmonic;
Described lower floor controller receives compensating instruction from the upper strata controller, receive synchronizing signal that previous lower floor controller sends and/or send synchronizing signal to next lower floor controller, generate pwm pulse, and under the upper strata controller feedback state information of power model, 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: the power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4;
Described upper strata controller comprises that sampling system selftest module, harmonic wave detection module, real time data issue module, coordinating control module, switching control module, levels data Coordination module and human-computer interaction module, wherein:
Described sampling system selftest module is used for the correctness that start detects sampling system;
Described harmonic wave detection module for detection of the load-side electric current, generates the compensating instruction current signal that is used for the compensation full frequency band;
Described real time data issues module, is used for sending instruction, the synchronous offset current of each power model to lower floor's controller;
Described coordinating control module is used for according to loading demand the quantity of the power model of needs input being carried out computing, monitoring and numbering, and sends synchronous triggering signal to the First power model of every group of power model;
Described switching control module is used for control system is carried out switching control;
Described levels data Coordination module is for the exchanges data of coordinating upper strata controller and lower floor's control device;
Described human-computer interaction module is used for artificially sending instruction or showing this control system state to this control system;
Described lower floor controller comprises dc voltage voltage stabilizing control module, current inner loop tracking control module, carrier signal synchronization module, SVPWM modulation module, overcurrent and overvoltage protective module, error protection module and state feedback module, wherein:
Described dc voltage voltage stabilizing control module is used for the closed-loop control direct voltage;
Described current inner loop is followed the tracks of control module, is used for comparing compensating instruction electric current and brachium pontis electric current to generate duty ratio;
Described carrier signal synchronization module, begin to send the carrier synchronization signal by the First power model in the same group of power model, sent by the power model of the upper numbering power model to next one numbering, be used for the carrier wave of each power model in the 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 the PWM rectifier generate harmonic current;
Described overcurrent and overvoltage protective module, the dc voltage, brachium pontis current peak and the effective value that are used for the monitoring power model are no more than threshold value;
Described error protection module is used for the fault-signal that the monitoring power semiconductor drives;
Described state feedback module is used for status information feedback with power model to the upper strata controller, and the state information of described power model comprises offset current effective value, dc voltage value and fault status information.
3. the high-power APF control system of modularization multi-machine parallel connection formula according to claim 1 is characterized in that: between described lower floor controller and the lower floor's controller, all connect by optical fiber between lower floor's controller and the upper strata controller.
4. the high-power APF system realization of modularization multi-machine parallel connection formula method is characterized in that: comprising:
(1) according to loading demand the quantity of the power model of needs input is carried out computing and monitoring: establishing load current is I
Lh, the specified offset current of every power model is I
APF, the quantity of choosing the power model that needs input is k+1, so that
kI
APF≤I
Lh≤(k+1)I
APFk；
When loading demand changes or lower floor's controller failure when cutting machine upper strata controller real-time update I
LhValue, and recomputate following formula;
(2) power model is numbered: the power model that needs are put into operation is one group according to 4 power models and is numbered, and four power models numberings of same group are respectively 1～4, and the power model numbering unification that does not need to put into operation is 0; Issue numbering and drop into order to each power model, receive drop into order, numbering is not that 0 power model carries out carrier synchronization according to numbering first, restarts running status;
(3) use carrier phase and eliminate the switch subharmonic: being numbered 1 power model phase angle is 0 °, and being numbered 2 power model phase angle is 180 °, and being numbered 3 power model phase angle is 90 °, and being numbered 4 power model phase angle is 270 °; Each cycle begins to send the carrier synchronization signal by the First power model in the same group of power model when beginning, and the power model of being numbered to the next one by the power model of a upper numbering sends, synchronously the 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 control comprises and puts into operation strategy and cut the machine strategy:
The described strategy that puts into operation is: when 1. certain power model need to put into operation, all must send request to the upper strata controller, only permitted, this power model just can put into operation, and the upper strata controller need to renumber and upgraded current stabilizing factor each power model this moment; 2. power model is received after the enabling signal, need at first closed contactor, rectification boosts to rated value, then send ready signal to the upper strata controller, the upper strata controller is by the time sequencing of the ready signal that receives, at first the power model that sends the earliest ready signal is numbered processing, until processing is processed the next power model that sends ready signal after finishing again; 3. when the power model of all appointments was all ready, the upper strata controller was assigned compensating instruction, and the power model of appointment is received and begun after the compensating instruction to compensate and to the state information of upper strata controller feedback power module; 4. after the upper strata controller is finished compensating instruction and assigned, continue monitoring grid side voltage signal and load-side current signal;
The described machine strategy of cutting is: 1. when power model detects faults itself, cut first machine and then fault message is beamed back the upper strata controller, the upper strata controller feeds back to host computer to fault-signal by man-machine interactive system, puts new power model into operation to substitute faulty equipment according to the strategy that puts into operation again; If 2. the upper strata controller detects load and reduces, the power model quantity of having moved has surpassed the required power model quantity of load, will send cutting machine signal to unnecessary power model so, power model cuts off out system after receiving cutting machine signal, and beam back the upper strata controller cutting machine information, the upper strata controller renumbers remaining power model.
5. the high-power APF system realization of modularization multi-machine parallel connection formula according to claim 4 method, it is characterized in that: also comprise: (5) levels data are coordinated: when the carrier synchronization signal triggers, the upper strata controller gathers the load-side current signal and calculates harmonic data, is issued to immediately each lower floor's controller; Simultaneously, each lower floor's controller interrupt latency data distributing generates pwm pulse, and is written into when next crest or trough, and each power model DDEL half is clapped or 1/4 bat.
6. the high-power APF system realization of modularization multi-machine parallel connection formula according to claim 5 method, it is characterized in that: in described (5), if upper strata controller carrier wave is consistent with the power model carrier wave that is numbered 1, the upper strata controller is written into the modulating wave data when trough, so: be numbered 1 power model and when crest, be written into the modulating wave data, postpone half and clap; Be numbered 2 power model and when trough, be written into the modulating wave data, postpone half and clap; Be numbered 3 power model and when trough, be written into the modulating wave data, postpone 1/4 and clap; Be numbered 4 power model and when crest, be written into the modulating wave data, postpone 1/4 and clap.
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