CN103326366A - Three-single-phase-three-wire-system parallel APF/SVG device - Google Patents
Three-single-phase-three-wire-system parallel APF/SVG device Download PDFInfo
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- CN103326366A CN103326366A CN2013102697896A CN201310269789A CN103326366A CN 103326366 A CN103326366 A CN 103326366A CN 2013102697896 A CN2013102697896 A CN 2013102697896A CN 201310269789 A CN201310269789 A CN 201310269789A CN 103326366 A CN103326366 A CN 103326366A
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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]
Abstract
The invention provides a three-single-phase-three-wire-system parallel APF/SVG device which comprises a controller. The controller determines the working state of the device. The controller comprises a main control DSP, an auxiliary DSP, a complex programmable logic device (CPLD), an AD sampling module, an external interface module and a controller power supply module. The main control DSP obtains loading currents detected by a first current sensor through the AD sampling module, harmonic waves are extracted through a trapped wave function, the main control DSP generates a PWM modulation resolution order, the CPLD transmits the PWM modulation resolution to a power module IGBT, the IGBP carries out the PWM modulation order at last, currents which are identical in magnitude of the harmonic waves and opposite in direction of the harmonic waves are output, and accordingly harmonic wave removing is achieved, and meanwhile the main control DSP detects three-phase power grid loading currents, idle currents are extracted in modes such as filtering, and finally the idle currents which are identical in magnitude and opposite in direction are output through a control strategy for compensating reactive power.
Description
Technical field
The invention belongs to the power electronics application, relate to a kind of electric filtering, reactive power compensator, relate in particular to a kind of three single-phase three wire systems APF/SVG device in parallel.
Background technology
Line voltage distortion, harmonic wave increase and can reduce power supplying efficiency, the useful life of reduction equipment so that power consumption equipment generates heat in a large number; simultaneously; harmonic wave can cause repeatedly multi-zero of line voltage, so that many measuring equipments can't be worked, the harmonic wave existence can cause protection mechanism malfunctioning.The line voltage distortion is mainly derived from nonlinear load, nonlinear loads such as frequency control equipment, rectifier bridge, UPS, computer, TV, incandescent lamp, and these equipment use in daily life in a large number, when the sinusoidal voltage nonlinear load that is added to will form harmonic current.
In the electrical network, asynchronous motor, transformer, arc furnace, rolling mill etc. all can consume idle at work, and reactive power can reduce power factor of electric network, can bring adverse effect to electric power system simultaneously.Uncompensated load can bring additional heating and vibration, and negative sequence component exists so that equipment criterion when execution action is affected, and can't work.
Summary of the invention
The object of the invention is to overcome the three single-phase three wire systems APF/SVG device in parallel that the defective of prior art provides a kind of capable of dynamic to suppress harmonic wave and compensating reactive power.
The present invention adopts following technical scheme for achieving the above object:
A kind of three single-phase three wire systems APF/SVG device in parallel comprises the controller of determination device operating state, and described controller comprises master control DSP, auxiliary DSP, programmable logic device (CPLD), AD sampling module, external interface module and controller supply module; Master control DSP, auxiliary DSP are connected with CPLD respectively, the AD sampling module is connected with master control DSP, CPLD is connected with three power models carrying out CPLD output PWM modulation resolution, the PWM modulation resolution order that CPLD reception master control DSP sends also exports the IGBT that forms power model to, IGBT finally carries out the PWM modulation orders, exports corresponding offset current to the three-phase alternating current electrical network; The AD sampling module is connected with respectively the first current sensor, the first voltage sensor that gathers three-phase alternating current electrical network voltage, the second current sensor that gathers this device output current that gathers three-phase alternating current electrical network load current, the second voltage transducer that gathers the power model dc voltage.
Described power model is 3 single-phase H bridge corner connection form, 1 H bridge is a power model, 1 H bridge is made of two and half H bridge parallel connections, two IGBT that all are parallel with backward diode are composed in series half H bridge, each half H bridge all is parallel with the RC loop that is composed in parallel by capacitor and resistance, and each H bridge is parallel with dc bus capacitor; Three-phase H bridge series reactor relief angle connects the three-phase alternating current electrical network in succession, and CPLD is connected the ripple to its conveying PWM by optical fiber with the IGBT of 3 single-phase H bridge, gathers simultaneously the repayment signal of IGBT.
Described dc bus capacitor adopts composite laminate busbar and single-phase H bridging to connect.
Comprise cooling fan, cooling fan is through control contactor and air switch access three-phase alternating current electrical network; The controller supply module is connected with the three-phase alternating current electrical network through EMC filter, isolating transformer, air switch.
Power model is connected respectively and is connected to the three-phase alternating current electrical network behind the three-phase pre-charge resistance, and the three-phase pre-charge resistance is parallel with respectively the excision contactor.
Be connected with the AC high pass filter that is formed by capacitor and resistor in series on the described power model three-phase outlet line, also be in series with respectively protection fuse and major loop circuit breaker on the power model three-phase outlet line.
Be connected with the DRAM for its interaction data in the described controller between master control DSP and the auxiliary DSP, auxiliary DSP is provided with I/O interface, CAN communication interface, RS485 interface and INTERNET interface.
Described auxiliary DSP is connected with man-machine interface able to programme.
Three single-phase three wire systems of the present invention APF/SVG device in parallel, utilize master control DSP, auxiliary DSP, CPLD three's cooperation is jointly finished control strategy and is realized final output PWM ripple, master control DSP obtains the load current that is detected by the first current sensor by the AD sampling module, utilize trap function to extract each harmonic, master control DSP produces PWM modulation resolution order, CPLD carries PWM modulation resolution to power model IGBT, IGBT finally carries out the PWM modulation orders, the electric current of output and each harmonic opposite sign but equal magnitude, thereby realize the harmonic wave elimination, in this installed specified compensation range, the mains by harmonics electric current satisfied among the GB/T14549-93 requirement to the current limit standard during stable state; Simultaneously, master control DSP detects the three phase network load current, utilizes the mode such as filtering to extract reactive current, and finally by control strategy output equal and opposite in direction, the reactive-current compensation of opposite direction is idle.When perceptual reactive current and harmonic wave existed simultaneously, both were superimposed upon in the range of capacity, all can compensate.If surpassing the capacity of this device, stack can select to be compensated for as preferentially with certain according to user's request.
Filtering of the present invention and reactive power compensation effect are not subjected to the mains frequency variable effect, not disturbed by the electromagnetic interference item of low-voltage device regulation.This device can compensate 2～50 subharmonic comprehensively, and can carry out the single harmonic component compensation.Can be to idle unbalanced load compensation, degree of unbalance can 100% compensation.Can be to harmonic wave and Reactive-current General Compensation, compensation PF value is up to 0.99.Can implement protection for different overload protection grades when the overload situations timer occurring, particularly surpass under 120% Overload, this device meeting automatic operation setting-up time backed off after random is also implemented specified operation, can not cause because of overload device to damage.
Description of drawings
Fig. 1 is circuit topology figure of the present invention.
Fig. 2 is control block diagram of the present invention.
Fig. 3 is load current vector exploded view of the present invention.
Fig. 4 is master control DSP control main logic figure of the present invention.
Fig. 5 is auxiliary DSP control main logic figure of the present invention.
Fig. 6 is CPLD control main logic figure of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
The invention discloses a kind of three single-phase three wire systems APF (APF Active Power Filter in parallel; Active Power Filter-APF)/SVG (Static Var Generator; static reacance generator) device; see also shown in Figure 1; among Fig. 1: Lsa; Lsb; Lsc is line impedance; TA4; TA5; TA6 is respectively A; B; the load current sensor of C three-phase; QF2 is that load drops into and excises total sky and open; QF3; QF4; QF5 is respectively harmonic wave and sends load; the perception reactive load; the capacitive reactive power load drops into and the excision sky is opened; QF6; the single-phase sky of excision was opened when QF7 was respectively the fictitious load imbalance; QF is the major loop circuit breaker; HPF is wave filter on AC side; FUa; FUb; FUc is respectively A; B; the protection fuse of C three-phase; TV1; TV2; TV3 is respectively A B; BC; CA three-phase alternating current electrical network voltage sensor; KM1 is the major loop circuit breaker; Rpa; Rpb; Rpc is respectively A; B; C three-phase pre-charge resistance; KM2 is pre-charge resistance excision contactor; TA1; TA2; TA3 is respectively AB; BC; CA device output current transducer; LA; LB; LC is linked reactor; TV4; TV5; TV6 is respectively three single-phase dc bus capacitor terminal voltages; QF1 is that control loop drops into and the excision sky is opened, and KM3 is the cooling fan control contactor.
A kind of three single-phase three wire systems APF/SVG device in parallel comprises that the controller of determination device operating state, described controller comprise master control DSP, auxiliary DSP, programmable logic device (CPLD), AD sampling module, external interface module, controller supply module.The AD sampling module connects respectively the first current sensor TA4 that gathers three-phase alternating current electrical network load current, TA5, TA6, gather the first voltage sensor TV1 of three-phase alternating current electrical network voltage, TV2, gathers the second current sensor TA1 of this device output current at TV3, TA2, TA3, the second voltage transducer TV4 of collection H bridge power model dc voltage, TV5, TV6, and the signal that collects delivered to respectively master control DSP and auxiliary DSP is carried out algorithm overall arrangement and calculation, protection, demonstration; Carry out exchanges data by the dram chip connection between master control DSP and the auxiliary DSP, finish external interface module order access, data demonstration, command execution; Master control DSP, auxiliary DSP are connected with CPLD respectively, master control DSP, auxiliary DSP will be delivered to CPLD about the PWM modulation resolution of power model, CPLD takes orders and finally exports the IGBT that forms power model to, IGBT finally carries out the PWM modulation orders, export corresponding offset current to the three-phase alternating current electrical network, CPLD has born a class fault collection task simultaneously, takes the trouble free service response of the very first time when fault.
Be simulation actual electric network working condition, the three-phase alternating current electrical network has connected respectively harmonic source, perceptual idle generating source, capacitive reactive power generating source.The idle generating source of perception is made of many groups inductance series and parallel, opens the QF4 switching by the button sky and changes the perceptual idle content that connects into electrical network, opens the uneven reactive load that the QF6 switching changes the access electrical network by sky; The capacitive reactive power generating source is that many group electric capacity series and parallels consist of, and opens the QF5 switching by the button sky and changes the capacitive reactive power content that connection networks, and opens the uneven reactive load that the QF7 switching changes the access electrical network by sky; Harmonic source is made of thyristor rectifier bridge and perceptual idle generating source, obtains the output current of different harmonic contents by changing the thyristor angle of flow, recycles perceptual reactive source so that harmonic content drops to certain limit, the simulation harmonic source; Harmonic source itself will reach large capacity and satisfy again THD value (harmonic distortion) within the specific limits, be difficult to reach, so the jumbo harmonic source of inferior simulation is to utilize thyristor harmonic current and perceptual reactive current in the stack of peak value place, finally obtains large capacity harmonic source output.Need to prove during load simulation when system load presents capacitive, if device will carry out harmonic compensation, resonance phenomena can occur, but can suppress resonance by changing metering system, finish harmonic compensation.
Described device main structure is 3 single-phase H bridge corner connection form, 1 H bridge is called a power model, a power model consists of the H bridge construction by following two and half H bridge parallel connections, such as Fig. 1, the IGBT V1 of two equal backward diodes in parallel, V2 is composed in series the first half H bridges, the IGBT V3 of two equal backward diodes in parallel, V4 is composed in series the second half H bridges, each half H bridge is parallel with the RC loop that is composed in parallel by capacitor and resistor, the first half H bridges and the second half H bridges compose in parallel the H bridge, and the H bridge is parallel with dc bus capacitor, and dc bus capacitor adopts composite laminate busbar and single-phase H bridging to connect.Three-phase H bridge is series reactor L respectively
A, L
B, L
CRelief angle connects the three-phase alternating current electrical network in succession, and CPLD is connected the ripple to its conveying PWM by optical fiber with 3 single-phase H bridge IGBT, gathers simultaneously the repayment signal of IGBT.
Three single-phase three wire systems of the present invention APF/SVG device in parallel, by detection load current, extraction each harmonic, the electric current of the output of this device and each harmonic opposite sign but equal magnitude, thus realize the harmonic wave elimination; Detect load current and utilize the mode such as filtering to extract reactive current, finally by the reactive current of control strategy output equal and opposite in direction and opposite direction, play the purpose of compensating reactive power.This device is selected can realize APF, SVG, APF+SVG, constant voltage mode, manually send the functions such as idle, applicable to the engineering of different load characteristic by external schema.The 3 single-phase H bridge DC side is generally composed in parallel by several polarity free capacitors in the prior art, adopts common busbar to connect, and stray inductance is large, easily shakes.Apparatus of the present invention use the composite laminate busbar to carry out dc bus capacitor and single-phase H bridging connects, in conjunction with H bridge electrical connection characteristics, with the double-deck mother misarrangement position via hole that resets, electric capacity is fixed the most at last in the composite bus bar, reduce the busbar stray inductance, improved the IGBT operation characteristic.
The above three single-phase three wire system APF/SVG device in parallel also is included as the cooling fan F1 of APF device cooling, and F2, F3, cooling fan access the three-phase alternating current electrical network behind control contactor KM3 and air switch QF1.
Be connected with the controller supply module behind three-phase alternating current electrical network process air switch QF1, isolating transformer, EMC filter, the process ACDC modular converter, be the power supply of APF/SVG Setup Controller, Setup Controller directly measures electricity from device, need not to power outward for controller.
3 single-phase H bridge power model is connected respectively and is connected to the three-phase alternating current electrical network behind three-phase pre-charge resistance Rpa, Rpb, the Rpc, and three-phase pre-charge resistance Rpa, Rpb, Rpc are parallel with respectively excision contactor KM2.Be connected with the AC high pass filter HPF that is formed by capacitor and resistor in series on the described power model three-phase outlet line, also be in series with respectively protection fuse FUa, Fub, FUc and major loop circuit breaker Q F on the power model three-phase outlet line.On this rating of set module temperature sensor is installed, the AD sampling module is connected with temperature sensor, gathers the temperature signal of this device.
Master control DSP and auxiliary DSP are provided with the DRAM for its interaction data in the described controller, and auxiliary DSP hardware periphery is provided with I/O interface, CAN current interface, RS485 interface and INTERNET interface.
Described auxiliary DSP is connected with man-machine interface able to programme.All information of man-machine interface are directed to auxiliary DSP; and the information of auxiliary DSP is compiled by self on the one hand; derive from the other hand main DSP; carry out information interaction by DRAM between the main and auxiliary DSP; the state information that for example produces after the execution of each button, for example the man-machine interface parameter protection value that downloads to main DSP is all carried out the information transmission by DRAM between main and auxiliary DSP.
Man-machine interface has complete status display interface, fault point and the switch motion state of reflection whole system; There is parameter the interface is set, finish the setting of protection value, in this interface, be provided with cryptoguard, only have the higher level operation personnel to make amendment; Have the logout interface, handle assembly moves whole process list records, and has the Auto-Memory function, can check for operating personnel; Have the waveform display interface, capable of dynamic is observed line voltage, power network current, load current, device output current; Have data display interface, significant data is shown protection compensation front and back THD value, idle amount shows before and after the compensation; And have the screen of copying effect, and can copy screen to all pictures, can save as multiple (such as BMP, JPG etc.) form, can check record for operating personnel.
Whole major loop structure and control loop structure have mainly been represented among Fig. 1; the cooperating process prescription of each parts is as follows in this loop: closed A.C. contactor after device passes through start-up course; behind the rear closed bypass contactor of precharge end etc.; system enters holding state; can devote oneself to work at any time according to user's request; control system is in real time from load current sensor; device output current transducer; line voltage; the dc voltage collection signal; for improving compensation precision and compensation rapidity; the sample frequency of this device is 10kHz; be used for two closed-loop controls; all kinds of feedback informations of join protection logic synthesis; PWM is transported on the 3 single-phase H bridge the most at last; finish IGBT and open shutoff; the IGBT equivalent switching frequency has improved compensation precision and the dynamic response time of device greatly up to 10kHz during operation.
Fig. 2 is control block diagram of the present invention: i
a, i
b, i
cBe respectively the threephase load electric current, iAPF is AB respectively, BC, and CA phase actual output current, θ is phase-locked angle.
This figure is take the single-phase control logic description figure that carries out as example.The overall control part can be divided into phase-locked loop (PLL) unit, harmonic current extraction unit, reactive power compensation current draw unit, two Closed Loop Control Unit.
The APF Setup Controller is for the processing of collection capacity:
Gather the threephase load current i
a, i
b, i
c, afterwards, controller converts thereof into ab/bc/ca three-phase current i corresponding to three-phase corner connection APF
Ab, i
Bc, i
Ca, conversion formula is
The extraction of harmonic current
The extraction of every phase harmonic current is to obtain after the notch filter under the load current use fundamental frequency of every phase is filtered out the first-harmonic composition.Notch filter also is the second order band stop filter, and its transfer function is:
Wherein: k is gain, and s is jw, and wherein w is signal frequency, B filter bandwidht, ω
cCentered by frequency.
The extraction of reactive power compensation electric current
Under the reactive power compensation working method, the extraction of offset current is divided into two parts, and a part is the positive sequence reactive current, and a part is the negative phase-sequence reactive current.With the i that collects
AbPostpone 90 degree, make up a virtual quadrature current; With current i
AbAnd and i
AbThe current transformation of quadrature is to the dq axle, thereby obtains positive sequence component and negative sequence component.
Phase locked-loop unit
The PLL unit obtains the phase theta of line voltage.Utilize second-order bandpass filter
The fundamental voltage and the process that obtain quadrature calculate θ.
Finally realize take dc voltage as outer shroud the double closed-loop control system take device output current IAPF as interior ring in conjunction with the dc voltage that collects and voltage on line side.
Among Fig. 2: ILa+, ILb+, ILc+ are respectively threephase load electric current positive sequence component, and ILa-, ILb-, ILc-are respectively threephase load electric current negative sequence component, and ILa, ILb, ILc are respectively the threephase load electric current.
The decomposition method that adopts during Fig. 3 major embodiment laod unbalance and since the APF model machine for be three-phase three wire system, so the zero-sequence component of load current is zero.The threephase load Current Decomposition can be become forward-order current and negative-sequence current by symmetrical component method, among Fig. 3, ILi+ represents forward-order current, and ILi-represents negative-sequence current (i=a, b, c).Ia is a phase load electric current.In the line voltage balance, and under the condition of laod unbalance, device needs idle component and the negative-sequence current of the forward-order current in the while compensating load, and power network current equilibrium and power factor after the guarantee compensation are 1.
Take a phase inverter bridge of device under star-like connection as example, the idle component of a phase forward-order current that compensates is vertical with line voltage, but negative-sequence current is not necessarily vertical with line voltage.When the idle component of forward-order current and negative-sequence current are compensated simultaneously, the device of this structure can't guarantee that offset current is vertical with the inverter bridge both end voltage, meeting causes capacitance voltage uncontrollable so that a phase inverter bridge can absorb from electrical network or send active power like this.
For the device that uses the angle type to connect, when the idle component of forward-order current and negative-sequence current are compensated, can guarantee that the electric current that sends on the inverter bridge of each phase is vertical with the inverter bridge both end voltage by increasing certain alternate (zero sequence) electric current, so that no longer absorption or send active power from electrical network of inverter bridge.Therefore, the device that uses the angle type to connect can allow both reactive powers of compensating load of system, the also negative-sequence current in the compensating load electric current, and simultaneously, device also can stable operation.
Man-machine interface arranges the aspect and implements; this device also is furnished with the local operation button when being furnished with man-machine interface; be that man-machine interface is as control equipment far away; operating personnel can finish monitoring and the operation to device in the control room; and a plurality of patterns can freely be switched; comprise when having capacitive reactive power in the load switching to the harmonic compensation pattern, man-machine interface can be made corresponding prompting, and protects action.Alert is carried out reasonable operation.
Fig. 4 is the control main logic figure of main DSP, mainly represents main DSP to the integrated logic processing procedure of whole system.Can instruct control system to make correct suitable processing with reference to this flow chart.Until APF main circuit, control loop close a floodgate complete after, master control DSP enters the main program operation, at first carry out disable interrupts, initialization operation, configuration register, Peripheral Interface, configure the PWM module, enable interrupt routine, the every 100us of this interrupt routine carries out once, and the interrupt timing time arrives, carry out the sampling subprogram of APF device, gather line voltage, power network current, load current, dc capacitor voltage equivalence and carry out filtering; Fault scanning, these fault-signal parts of fault such as that whether scanning means has is under-voltage, overvoltage, excess temperature, overcurrent, lacuna are that master control DSP gathers voluntarily, a part is that auxiliary DSP sends by DRAM, PLL is phase-locked, the PLL computing aequum that gathers is carried out computing, according to the PWM modulating wave of each amount that collects in conjunction with idle extraction, harmonic wave extraction, the final formation control IGBT work of double-loop control strategy; Carry out the order such as input, excision, standby, shutdown of APF device according to extraneous Local or Remote operational order, this part signal is transferred to master control DSP by auxiliary DSP by DRAM exactly.When running into emergency, program can be controlled direct blockade PWM ripple and enable, and forbids IGBT work, guarantees the IGBT trouble free service.When some faults occur, can take scram button and directly block PWM and enable and cut off the APF major loop to connect, will install with electrical network and throw off, avoid fault expansion.
Fig. 5 is the control logic figure of auxiliary DSP, mainly represents auxiliary DSP to its responsible integrated disposal processing.Auxiliary DSP is mainly finished the information interaction in man-machine interface, various states, fault, event etc. is delivered to man-machine interface show.Can obtain the logic function of auxiliary DSP with reference to this flow chart.Auxiliary DSP until major loop and control loop close a floodgate complete after, enter the main program operation, at first carry out the initialization operation, configuration DSP register, Peripheral Interface, the initialization of AD sampling module, with the SCI module initialization of man-machine interface communication, enable interrupt routine, the every 100us of this interrupt routine carries out once, carries out the sampling of APF device after interrupting arriving, gather line voltage, power network current, load current, dc capacitor voltage, temperature equivalence, and the effective value of calculating collection capacity shows; The faults such as that whether fault scanning, scanning means have is under-voltage, overvoltage, excess temperature, overcurrent, phase shortage, and show; A data part that shows in the man-machine interface by auxiliary DSP gather voluntarily, a part derives from master control DSP, auxiliary DSP and man-machine interface adopt the MODUBUS communications protocol, continues to use the CRC check in this agreement of knowing clearly, and has guaranteed the reliability of transfer of data.The temperature signal of auxiliary DSP collection will be controlled the startup of cooling fan and stop, and auxiliary DSP is blocked PWM and enabled, forbids that PWM exports and inform that master control DSP disconnects major loop when temperature surpasses setting protection value.
Fig. 6 is the control logic figure of CPLD, mainly represents CPLD to its responsible integrated disposal processing.Represent the first class of protection task that it is born, and and main DSP and auxiliary DSP between interactive information, can obtain the function that CPLD finishes with reference to this flow chart.CPLD is as programmable logic device; can a plurality of tasks of executed in parallel; when hardware, programming, the first class of protection execution has been put in this device; after CPLD is charged; just begin to scan the peripheral hardware interface whether the fault-signal input is arranged; block immediately the PWM ripple if detect fault, forbid IGBT operation, and fault is transferred to master control DSP by data wire and address wire with fault carries out the major loop action, be transferred to auxiliary DSP and be used for showing.When normal, CPLD accepts the PWM modulation signal from master control DSP, and after carrying out the internal fault judgement, the PWM modulation signal is outputed to IGBT, so that IGBT work compensates accordingly.
Through the implementation to whole technical scheme, final so that whole device links closely cooperates, strengthen whole device compensation effect, compensation precision be provided, improved dynamic response time, finally form the 3 single-phase H bridge corner connection low-voltage high-capacity APF/SVG of high characteristic.
The present invention consists of the core of this device take IGBT as control device.Protected in conjunction with the PWM that CPLD sends turns on and off, comprehensive CPLD gathers IGBT fault and load overcurrent by two DSP; first class of protection (for example hardware overcurrent protection) locking IGBT function setting in CPLD, can be made action the very first time under fault state.Second class protection (for example effective value protection) is arranged among the main DSP, three-level protective (for example temperature protection) is arranged in the auxiliary DSP.The DSP that adopts at present is TMS320F28335 high-speed computation chip, and the CPLD of employing is XCR3256X, has improved whole closed loop arithmetic speed, has improved the switching frequency of full control device.So that total percent harmonic distortion (THD) is not more than 3%, the standby response time is not more than 1ms, and total reponse time is not more than 5ms.
The operation of APF can be accomplished unattended operation, and all running statuses, data, fault point, fault message, logout, historical record all show in man-machine interface and deposit, and can be delivered to night shift room by suitable communication modes.Send audible alarm during catastrophe failure, so that operator on duty's very first time is understood the whole system operating mode, make the first reaction, prevent that fault from spreading.The communication interface of diversification so that the kind of man-machine interface is selected the variation that also becomes, can be worked out according to system's needs the interface of more hommization, can select communication mode more at a high speed, CAN communication interface for example, communication speed can reach 1M, and the INTERNET communication speed can be doubled and redoubled.The MODBUS communications protocol based on the RS485 serial ports that adopts at present.
Control loop comprises: the one, and the control loop power supply, this control system power supply is directed to device itself, need not separately control loop to be powered, and control loop is furnished with isolating transformer, suppresses the pi type filter of electromagnetic interference; The 2nd, the master control structure by contain two DSP+CPLD, AD, sample circuit master control printed board forms.Sampling circuit gathers line voltage, dc voltage, device output current, load current to the AD chip, finally be transported to main DSP and auxiliary DSP and carry out closed-loop control, the final PWM of realization ripple sends under these hardware cooperate, so that device output realizes harmonic compensation, reactive power compensation in like manner with the electric current of the harmonic current opposite sign but equal magnitude that detects.DSP and CPLD cooperate the repayment of enforcement fault, fault actions simultaneously.
Can make action according to protection class for faults such as overvoltage, overcurrent, excess temperatures.
Adopt special construction, this installed capacity expansion also becomes easily, and a plurality of device can parallel running, also can be used in conjunction with passive filtration unit.Control precision and dynamic response time have all obtained greatly promoting, and are applicable to test (can be used as high accuracy capacitive or inductive load) and commercial Application (harmonic wave control and reactive power compensation).
The above only is one embodiment of the present invention, it or not whole or unique execution mode, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Claims (8)
1. single-phase three wire system APF/SVG device in parallel, it is characterized in that: comprise the controller of determination device operating state, described controller comprises master control DSP, auxiliary DSP, programmable logic device (CPLD), AD sampling module, external interface module and controller supply module; Master control DSP, auxiliary DSP are connected with CPLD respectively, the AD sampling module is connected with master control DSP, CPLD is connected with three power models carrying out CPLD output PWM modulation resolution, the PWM modulation resolution order that CPLD reception master control DSP sends also exports the IGBT that forms power model to, IGBT finally carries out the PWM modulation orders, exports corresponding offset current to the three-phase alternating current electrical network; The AD sampling module is connected with respectively the first current sensor (TA4 that gathers three-phase alternating current electrical network load current, TA5, TA6), gather the first voltage sensor (TV1 of three-phase alternating current electrical network voltage, TV2, TV3), gather second current sensor (TA1, TA2, TA3) of this device output current, the second voltage transducer (TV4 of collection power model dc voltage, TV5, TV6).
2. three single-phase three wire systems according to claim 1 APF/SVG device in parallel, it is characterized in that: described power model is 3 single-phase H bridge corner connection form, 1 H bridge is a power model, 1 H bridge is made of two and half H bridge parallel connections, two IGBT that all are parallel with backward diode are composed in series half H bridge, each half H bridge all is parallel with the RC loop that is composed in parallel by capacitor and resistance, and each H bridge is parallel with dc bus capacitor; Three-phase H bridge series reactor (L
A, L
B, L
C) relief angle connects the three-phase alternating current electrical network in succession, CPLD is connected with the IGBT of 3 single-phase H bridge to it by optical fiber and carries the PWM ripple, gathers simultaneously the repayment signal of IGBT.
3. three single-phase three wire systems according to claim 2 APF/SVG device in parallel, it is characterized in that: described dc bus capacitor adopts composite laminate busbar and single-phase H bridging to connect.
4. three single-phase three wire systems according to claim 1 and 2 APF/SVG device in parallel, it is characterized in that: comprise cooling fan (F1, F2, F3), cooling fan accesses the three-phase alternating current electrical network through control contactor (KM3) and air switch (QF1); The controller supply module is connected with the three-phase alternating current electrical network through EMC filter, isolating transformer, air switch (QF1).
5. three single-phase three wire systems according to claim 1 and 2 APF/SVG device in parallel, it is characterized in that: power model is connected respectively and is connected to the three-phase alternating current electrical network behind the three-phase pre-charge resistance (Rpa, Rpb, Rpc), and three-phase pre-charge resistance (Rpa, Rpb, Rpc) is parallel with respectively excision contactor (KM2).
6. want 5 described three single-phase three wire systems APF/SVG device in parallel according to right; it is characterized in that: be connected with the AC high pass filter (HPF) that is formed by capacitor and resistor in series on the described power model three-phase outlet line; also be in series with respectively protection fuse (FUa on the power model three-phase outlet line; Fub, FUc) and major loop circuit breaker (QF).
7. three single-phase three wire systems according to claim 5 APF/SVG device in parallel, it is characterized in that: be connected with the DRAM for its interaction data in the described controller between master control DSP and the auxiliary DSP, auxiliary DSP is provided with I/O interface, CAN communication interface, RS485 interface and INTERNET interface.
8. three single-phase three wire systems according to claim 7 APF/SVG device in parallel, it is characterized in that: described auxiliary DSP is connected with man-machine interface able to programme.
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| CN106527408A (en) * | 2016-12-26 | 2017-03-22 | 中国西电电气股份有限公司 | Power electronic controller test system based on RT-LAB real-time digital simulation platform |
| CN108448598A (en) * | 2018-03-29 | 2018-08-24 | 山西中州电气有限公司 | Hybrid electric energy comprehensive treatment device |
| CN110635484A (en) * | 2019-11-13 | 2019-12-31 | 平顶山学院 | Method, device and equipment for generating instruction current of single-phase active filter |
| CN112653153A (en) * | 2020-12-16 | 2021-04-13 | 特变电工西安电气科技有限公司 | Voltage reactive power comprehensive control method of SVG |
| CN113514762A (en) * | 2021-07-15 | 2021-10-19 | 江苏莱提电气股份有限公司 | System for detecting state of APF/SVG relay |
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