CN103683290B - A kind of parallel connection type active electric filter - Google Patents
A kind of parallel connection type active electric filter Download PDFInfo
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- CN103683290B CN103683290B CN201310691694.3A CN201310691694A CN103683290B CN 103683290 B CN103683290 B CN 103683290B CN 201310691694 A CN201310691694 A CN 201310691694A CN 103683290 B CN103683290 B CN 103683290B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/20—Active power filtering [APF]
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Abstract
A kind of parallel connection type active electric filter, comprise current acquisition unit, voltage acquisition unit, IGBT driver element, IGBT switch element and grid integration unit, characterized by further comprising dsp chip, fpga chip, grid integration current acquisition unit and system running state collecting unit, the output of described current acquisition unit and voltage acquisition unit is linked into the A/D input of dsp chip respectively, described dsp chip is used for the contrary instruction current signal in the detection harmonic signal direction of electrical network, described fpga chip goes out PWM output signal according to instruction current signal madulation and outputs to IGBT driver element, and the harmonic current formed by IGBT drive unit drives IGBT switch element and offset current, and be injected in electrical network through grid integration unit, described grid integration current acquisition unit gathers the compensating current signal that grid integration unit exports, and output to fpga chip, at least this compensating current signal regulates PWM output signal by fpga chip, hinge structure the present invention improves the flexibility of application, reliability and fail safe.
Description
Technical field
The present invention relates to a kind of parallel connection type active electric filter, it belongs to active electric filter device class.
Background technology
Along with the development of technology, increasing nonlinear load is widely used in industry and daily life field, the existence of these nonlinear loads in electrical network, form a large amount of harmonic waves, form reactive current on the one hand, directly affects the power factor of whole electric power system thus have influence on the operational efficiency of electric power system, on the other hand, these harmonic waves are exactly a kind of pollution concerning electric power system, a kind of public hazards, except the safety and economic operation of electric power system itself is constituted a threat to, also the running environment of power electronic equipment can produce the impact of great harmfulness, described impact even injures Information Technology Equipment, the normal operation of the sensitive instrument and equipment of the various advanced persons in the fields such as microelectric technique equipment and Computerized Numerical Control processing technology.Harmonic problem in current solution electrical network, generally acknowledge that in the industry good scheme is have the active power filtering scheme adopting Active Power Filter-APF, Active Power Filter-APF (APF:Activepowerfilter) be a kind of be based upon on Theory of Instantaneous Reactive Power of Three-Phase Circuits basis for dynamic harmonic wave, the novel electric power electric device of compensating reactive power, it can carry out quick tracing compensation to the harmonic wave of different size and frequency, why be called active, can only for the harmonic wave of Passive intake fixed frequency and size relative to passive LC filter, APF can pass through sampling load current and carry out each harmonic to be separated with idle, and the size of electric current that exports to electrical network of ACTIVE CONTROL Active Power Filter-APF on this basis, frequency and phase place, and respond fast, to offset phase induced current in load.In the prior art, parallel connection type active electric filter is a kind of Active Power Filter-APF be most widely used, be attempted by power network line during parallel connection type active electric filter application, its operation principle is generally detect load current by current transformer, and calculated by inner DSP, extract the harmonic components in load current, then inner IGBT is sent to by pwm signal, control inverter produces one and load harmonic current equal and opposite in direction, the contrary harmonic current injection in direction, in electrical network, reaches the object of filtering.Because it is by contrary harmonic current injection, both can mend harmonic wave for this reason, can mend again idle and uneven.The parallel connection type active electric filter of prior art is for disclosed in Chinese invention patent ZL200910061816.4, this Active Power Filter-APF disclosed in ZL200910061816.4, comprises fundamental voltage detecting unit, electronic power inverter system unit and access system unit; Fundamental voltage detecting unit comprises voltage transformer and fundamental voltage detection, the output of voltage transformer and the input of fundamental voltage detection are connected, fundamental voltage detecting unit will detect in the line voltage from distortion that fundamental voltage signal is as fundamental voltage detecting unit output signal, sends into the voltage gain circuit of electronic power inverter system unit; Electronic power inverter system unit comprises voltage gain circuit and voltage generating circuit; Voltage gain circuit sends into voltage generating circuit after being amplified by the fundamental voltage signal detected, voltage generating circuit produces a voltage proportional with its input signal, and output and the access system unit of voltage generating circuit are connected; During work, voltage transformer is connected in parallel on the two ends of harmonic source, and access system unit is by the output voltage of voltage generating circuit and be connected in the two ends of harmonic source; This Active Power Filter-APF also comprises Harmonic currents detection unit, is provided with current gain circuit and adder in electronic power inverter system unit; Harmonic currents detection unit comprises current transformer and harmonic wave detection, and on current transformer serial connection electrical network bus, the output of current transformer and the input of harmonic detecting link are connected; Current transformer detects that from the system power of electrical network bus current signal sends into harmonic detecting link, harmonic detecting link detects that harmonic current sends into current gain circuit, and current gain circuit sends into adder after being amplified by the harmonic current signal detected; Adder is using the input signal of the voltage signal after harmonic current signal and fundamental voltage signal plus as voltage generating circuit.Under preferred version, the access system unit of this Active Power Filter-APF disclosed in ZL200910061816.4 is made up of reactor, during use, an output of voltage generating circuit and a bus of electrical network are connected, another output is by being connected with another root bus of electrical network after a reactor, under another preferred version, the access system unit of this Active Power Filter-APF disclosed in ZL200910061816.4 is made up of transformer, during use, two outputs of voltage generating circuit and the secondary side of a transformer are connected, the two ends of the primary side of transformer are connected on two buses of electrical network respectively.This Active Power Filter-APF of three covers disclosed in ZL200910061816.4 can form three-phase system, for the electric power system of three-phase four-wire system.This Active Power Filter-APF Problems existing disclosed in ZL200910061816.4 is that some signal analysis of its core and control signal forming unit are made up of discrete unit module, the stability of system and reliability are in operation existing problems, moreover, the switch harmonic formed in electronic inverter system works can seal in electrical network, form secondary pollution, in addition, whole system forms output voltage simple closed-loop control system from harmonic wave Sampling formation control instruction current finally by electronic inverter system, such closed-loop control system is when output determines to there is switch harmonic, especially easily form self-excitation, this Active Power Filter-APF whole system disclosed in what is more important ZL200910061816.4 does not have reliable operation monitoring and security system, once there is abnormal conditions in operation, can only by manually intervening, operation risk is large especially for this reason.For the problem of the switch harmonic formed in electronic inverter system works, inventor notices the solution disclosed in Chinese invention patent ZL201010275272.4 and CN201310049218.1, the common ground of these two schemes is the increase in second current transformer being used for detected electrons inverter system output end current specially, it is the offset current of real-time acquisition device in essence, compare with by the load harmonic current collected, form a closed loop feedback to control, application practice shows, such mode is good solution not, reason is that load harmonic current has contained the harmonic current in offset current in essence, under these circumstances, the two to be compared algorithmically complicated completely, system resource consume is very big, directly have influence on response speed, obviously response is one of application prerequisite of active power filtering in time, in sum, obvious prior art has the necessity improved further.
Summary of the invention
The object of the present invention is to provide a kind of parallel connection type active electric filter, to overcome prior art Problems existing.
A kind of parallel connection type active electric filter of the present invention, comprise current acquisition unit, voltage acquisition unit, IGBT driver element, IGBT switch element and grid integration unit, characterized by further comprising dsp chip, fpga chip, grid integration current acquisition unit and system running state collecting unit, the output of described current acquisition unit and voltage acquisition unit is linked into the A/D input of dsp chip respectively, described dsp chip is used for the detection harmonic signal of electrical network and/or reactive current signal and/or unsymmetrical current signal, and form the instruction current signal contrary with the load harmonic current of electrical network and/or reactive current signal and/or unsymmetrical current signal code direction, and output to fpga chip, fpga chip goes out PWM output signal according to instruction current signal madulation and outputs to IGBT driver element, and form one and load harmonic current equal and opposite in direction by IGBT drive unit drives IGBT switch element, the harmonic current that direction is contrary and offset current, and be injected in electrical network through grid integration unit, described grid integration current acquisition unit gathers the compensating current signal that grid integration unit exports, and output to fpga chip, at least this compensating current signal and instruction current signal is carried out phase compare by fpga chip, and perform phase-locked loop calculating and according to result of calculation, the PWM output signal that fpga chip is formed regulated, the offset current of output is made to have correct phase place, described system running state collecting unit sends the system running state signal collected to dsp chip and/or fpga chip, corresponding control action is made according to operating state signal by dsp chip and/or fpga chip.
As preferably, described current acquisition unit is made up of current transformer and double operational filter and amplification unit, and the load current signal that described current transformer senses amplifies after process through double operational filter and amplification unit filtering and forms the A/D input that simple load harmonic current signal outputs to dsp chip;
As preferably, described voltage acquisition unit is made up of voltage transformer and double operational filter and amplification unit, and the load voltage signal that described voltage transformer senses amplifies after process through double operational filter and amplification unit filtering and forms the A/D input that simple load fundamental voltage signal outputs to dsp chip;
As preferably, described IGBT driver element comprises NAND gate circuit, IGBT driving chip and isolating transformer, the input of described NAND gate circuit connects with the output of fpga chip, accept the PWM output signal that fpga chip goes out according to instruction current signal madulation, described PWM output signal exports through NAND gate circuit shaping and enters IGBT driving chip formation IGBT switch element drive singal, and described IGBT switch element drive singal outputs to the drive end of IGBT switch element through isolating transformer;
As aforementioned preferred improvement further, the function of the integrated overvoltage of described IGBT driving chip, overcurrent, excess temperature, soft switching, and there is soft switching input, described soft switching input is connected with the control output end of fpga chip by the first control line;
As preferably, described grid integration unit comprises low-pass filtering subdivision and reactor, the HF switch harmonic wave that described low-pass filtering subdivision is formed in order to filter IGBT switch element, the output of low-pass filtering subdivision is connected with reactor, and outputs to three phase network through described reactor;
As aforementioned preferred preferred further, described grid integration unit also comprises contactor, and described contactor tandem reactor is on the loop of three phase network.Described contactor comprises control end, and described control end is connected to a control signal output of fpga chip by the second control line;
As preferably, system running state collecting unit comprises heatsink temperature sensor, the operating state transducer of IGBT switch element, the DC bus overcurrent-overvoltage transducer of IGBT switch element, contactor temperature sensor, the system radiating fan running status transducer of IGBT switch element, and by the double operational filtering conditioning unit formed with each transducer double operational filtering one to one modulate circuit.
As preferably, also comprise man-machine interface, described man-machine interface is a touch screen, and it is communicated with dsp chip and/or fpga chip by 485 interfaces, and described man-machine interface is in order to the parameter waveform of display system operating state, each index.
As preferably, also comprise external communication interface, described external communication interface adopts standard communication interface, to provide the passage run with the connection of top level control system and parallel operation.
This parallel connection type active electric filter of the present invention, with dsp chip and fpga chip for core is built, by the data-handling capacity that dsp chip is powerful, can be exactly, calculate content and the amplitude of each harmonic rapidly, fast response time, and can unrestricted any select need compensate different times harmonics, practical application shows, the parallel connection type active electric filter of this improvement of the present invention can 2 ~ 50 subharmonic in real time dynamically in filtering load electrical network, in addition, due to the flexibility of dsp chip application, the typicalness characteristic harmonics existed in filtering electrical network phase line and zero line can be selected very easily for this reason, the parallel connection type active electric filter of this improvement of the present invention can also be made as required to be operated in specific pattern under, such as artificially set the desired value etc. of filtering particular harmonic and artificial setting filtering harmonic wave.
Equally due to the flexibility of dsp chip application, the parallel connection type active electric filter of this improvement of the present invention is utilized to form product, also the active electric filter device erecting a set of three-phase four-wire system is very easy to, in three-phase four-wire system electrical network, because load-side 3n subharmonic can superpose in N phase line, so traditional active power filter for three-phase four-wire system product is all arranged by three times of phase line filter capacity for the harmonic ability on zero line.And in the present invention, the harmonic current for N phase carries out filtering by being very easy to realization with independent brachium pontis, can complete filtering N phase harmonic wave.
Still the flexibility that dsp chip is applied is, the parallel connection type active electric filter of this improvement of the present invention is obviously very easy to by multiple compensate functions such as dsp chip and/or the built-in harmonic compensation of fpga chip, reactive power compensation, imbalance compensations, and such user can select compensate function by sets itself in use.While filtering harmonic wave, the power factor of system can be detected, and the degree of unbalance of each phase line, and then correspondingly carry out reactive power compensation and eliminate laod unbalance phenomenon.
The parallel connection type active electric filter of this improvement of the present invention, its man-machine interface obviously can the touch screen of adaptive large gauge, simple to operation like this.Can displaying data in real-time and curve, can provide the complete field data of system cloud gray model, meanwhile, user can select the application functions such as built-in harmonic compensation, reactive power compensation, imbalance compensation by contact action.
This parallel connection type active electric filter of the present invention; there is complete effective all kinds of safeguard measure; once there is the anomalies such as over-voltage and over-current in system; directly cut-out and the connecting of electrical network can be controlled by fpga chip; and the output of locking IGBT driver element and IGBT switch element, guarantee system safety.
This parallel connection type active electric filter of the present invention, low-pass filtering subdivision built-in in grid integration unit really self switch high-frequency carrier wave can not feedback grid, its access way also makes system independent of outside network system impedance simultaneously, not by the impact of electrical network system impedance, resonance does not occur and harmonic voltage amplifies, fail safe is good.In addition, the present invention also can according to practical situations, limit offset current automatically and reasonably, device is overcurrent never, moreover, while filtering, the output current of real-time checkout gear itself, makes the offset current of output have correct phase place, simultaneously when occurring overcurrent and other improper phenomenons at every turn by the phase lock control that fpga chip performs on the one hand, can the output of cutoff device timely, so overcompensation can be avoided completely.
The present invention also has standard communication interface, meets the needs that electric power system realizes power monitoring function.And general Modbus telecommunication protocol can be adopted in the application, communication interface can be RS485/232 and CAN.
Accompanying drawing explanation
Fig. 1 is a kind of a kind of parallel connection type active electric filter for three phase network adopting inventive concept to build that present pre-ferred embodiments provides
Active power filter system structured flowchart;
Fig. 2 is current acquisition unit and the voltage acquisition unit structured flowchart of a kind of a kind of parallel connection type active electric filter for three phase network adopting inventive concept to build that present pre-ferred embodiments provides;
Fig. 3 is the IGBT drive unit system structured flowchart of a kind of parallel connection type active electric filter for three phase network that present pre-ferred embodiments provides;
Fig. 4 is the system running state collecting unit system architecture diagram of a kind of parallel connection type active electric filter for three phase network that present pre-ferred embodiments provides;
Fig. 5 is the grid integration cellular system structured flowchart of a kind of a kind of parallel connection type active electric filter for three phase network adopting inventive concept to build that present pre-ferred embodiments provides.
Embodiment
Below with reference to present pre-ferred embodiments provide a kind of adopt inventive concept to build a kind of parallel connection type active electric filter for three phase network and accompanying drawing the invention will be further described.
A kind of a kind of parallel connection type active electric filter for three phase network adopting inventive concept to build that present pre-ferred embodiments provides, as accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, shown in accompanying drawing 5, comprise current acquisition unit 1, voltage acquisition unit 2, IGBT driver element 3, IGBT switch element 4 and grid integration unit 5, because this preferred embodiment is a kind of parallel connection type active electric filter for three phase network, current acquisition unit 1 for this reason, voltage acquisition unit 2, IGBT driver element 3, IGBT switch element 4 and grid integration unit 5 include three respectively corresponding with the three-phase of three phase network 9 independently and identical circuit form, its main points are also to comprise dsp chip 5, fpga chip 6, grid integration current acquisition unit 7 and system running state collecting unit 8, the output of described current acquisition unit 1 and voltage acquisition unit 2 is linked into the A/D input of dsp chip 5 respectively, described dsp chip 5 is for the harmonic signal of detection of grid and/or reactive current signal and/or unsymmetrical current signal, and form the instruction current signal contrary with the load harmonic current of electrical network and/or reactive current signal and/or unsymmetrical current signal code direction, and output to fpga chip 6, fpga chip 6 goes out PWM output signal according to instruction current signal madulation and outputs to IGBT driver element 3, and drive IGBT switch element 4 to form one and load harmonic current equal and opposite in direction by IGBT driver element 3, the harmonic current that direction is contrary and offset current, and be injected in electrical network through grid integration unit 5, described grid integration current acquisition unit 7 gathers the compensating current signal that grid integration unit 5 exports, and output to fpga chip 6, in this preferred embodiment, this compensating current signal and instruction current signal is carried out phase compare by described fpga chip 6, and perform phase-locked loop calculating, and according to result of calculation, the PWM output signal that fpga chip 6 is formed is regulated, the offset current of output is made to have correct phase place, described system running state collecting unit 8 sends the system running state signal collected to dsp chip 5 and/or fpga chip 6, corresponding control action is made according to operating state signal by dsp chip 5 and/or fpga chip 6.
In this preferred embodiment, as shown in Figure 2, described current acquisition unit 1 is made up of current transformer 101 and double operational filter and amplification unit 102, and the required load current signal of described current transformer sense 101 forms the A/D input that simple load harmonic current signal outputs to dsp chip 5 after double operational filter and amplification unit 102 filter amplifying processing;
In this preferred embodiment, as shown in Figure 2, described voltage acquisition unit 2 is made up of voltage transformer 201 and double operational filter and amplification unit 202, and the load voltage signal that described voltage transformer 201 senses forms the A/D input that simple load fundamental voltage signal outputs to dsp chip 5 after double operational filter and amplification unit 202 filter amplifying processing;
In this preferred embodiment, as shown in Figure 3, IGBT driver element 3 comprises NAND gate circuit 301, IGBT driving chip 302 and isolating transformer 303, the input of described NAND gate circuit 301 connects with the output of fpga chip 6, accept the PWM output signal that fpga chip 6 goes out according to instruction current signal madulation, described PWM output signal enters IGBT driving chip 302 through NAND gate circuit 301 shaping output and forms IGBT switch element drive singal, and described IGBT switch element drive singal outputs to the drive end of IGBT switch element 4 through isolating transformer;
In this preferred embodiment, the function of the integrated overvoltage of described IGBT driving chip 302, overcurrent, excess temperature, soft switching, and there is soft switching input, described soft switching input is connected with the control output end of fpga chip 6 by the first control line 304;
In this preferred embodiment, described grid integration unit 5 comprises low-pass filtering subdivision 501 and reactor 502, the HF switch harmonic wave that described low-pass filtering subdivision 501 is formed in order to filter IGBT switch element, the output of low-pass filtering subdivision 501 is connected with reactor 502, and outputs to three phase network 9 through described reactor 502;
In this preferred embodiment, described grid integration unit 5 also comprises contactor 503, on the loop of described contactor 503 tandem reactor 502 to three phase network 9.Described contactor 503 comprises control end, and described control end is connected to a control signal output of fpga chip 6 by the second control line 504;
In this preferred embodiment, system running state collecting unit 8 comprises heatsink temperature sensor 801, the operating state transducer 802 of IGBT switch element, the DC bus overcurrent-overvoltage transducer 803 of IGBT switch element, contactor temperature sensor 804, the system radiating fan running status transducer 805 of IGBT switch element, and by the double operational filtering conditioning unit 806 formed with each transducer double operational filtering one to one modulate circuit.
In this preferred embodiment, also comprise man-machine interface 10, described man-machine interface 10 is a touch screen, and it is communicated with dsp chip 5 and/or fpga chip 6 by 485 interfaces, and described man-machine interface 10 is in order to the parameter waveform of display system operating state, each index.
In this preferred embodiment, also comprise external communication interface 11, described external communication interface adopts standard communication interface, to provide the passage run with the connection of top level control system and parallel operation.
Claims (10)
1. a parallel connection type active electric filter, comprise current acquisition unit, voltage acquisition unit, IGBT driver element, IGBT switch element and grid integration unit, characterized by further comprising dsp chip, fpga chip, grid integration current acquisition unit and system running state collecting unit, the output of described current acquisition unit and voltage acquisition unit is linked into the A/D input of dsp chip respectively, described dsp chip is used for the detection harmonic signal of electrical network and/or reactive current signal and/or unsymmetrical current signal, and form the instruction current signal contrary with the load harmonic current of electrical network and/or reactive current signal and/or unsymmetrical current signal code direction, and output to fpga chip, fpga chip goes out PWM output signal according to instruction current signal madulation and outputs to IGBT driver element, and form one and load harmonic current equal and opposite in direction by IGBT drive unit drives IGBT switch element, the harmonic current that direction is contrary and offset current, and be injected in electrical network through grid integration unit, described grid integration current acquisition unit gathers the compensating current signal that grid integration unit exports, and output to fpga chip, this compensating current signal and instruction current signal is carried out phase compare by fpga chip, and perform phase-locked loop calculating and according to result of calculation, the PWM output signal that fpga chip is formed regulated, the offset current of output is made to have correct phase place, described system running state collecting unit sends the system running state signal collected to dsp chip and/or fpga chip, corresponding control action is made according to operating state signal by dsp chip and/or fpga chip.
2. a kind of parallel connection type active electric filter according to claim 1, it is characterized in that described current acquisition unit is made up of current transformer and double operational filter and amplification unit, the load current signal that described current transformer senses amplifies after process through double operational filter and amplification unit filtering and forms the A/D input that simple load harmonic current signal outputs to dsp chip.
3. a kind of parallel connection type active electric filter according to claim 1, it is characterized in that described voltage acquisition unit is made up of voltage transformer and double operational filter and amplification unit, the load voltage signal that described voltage transformer senses amplifies after process through double operational filter and amplification unit filtering and forms the A/D input that simple load fundamental voltage signal outputs to dsp chip.
4. a kind of parallel connection type active electric filter according to claim 1, it is characterized in that described IGBT driver element comprises NAND gate circuit, IGBT driving chip and isolating transformer, the input of described NAND gate circuit connects with the output of fpga chip, accept the PWM output signal that fpga chip goes out according to instruction current signal madulation, described PWM output signal exports through NAND gate circuit shaping and enters IGBT driving chip formation IGBT switch element drive singal, described IGBT switch element drive singal outputs to the drive end of IGBT switch element through isolating transformer.
5. a kind of parallel connection type active electric filter according to claim 4, it is characterized in that the function of the integrated overvoltage of described IGBT driving chip, overcurrent, excess temperature, soft switching, and there is soft switching input, described soft switching input is connected with the control output end of fpga chip by the first control line.
6. a kind of parallel connection type active electric filter according to claim 1, it is characterized in that described grid integration unit comprises low-pass filtering subdivision and reactor, the HF switch harmonic wave that described low-pass filtering subdivision is formed in order to filter IGBT switch element, the output of low-pass filtering subdivision is connected with reactor, and outputs to three phase network through described reactor.
7. a kind of parallel connection type active electric filter according to claim 6, it is characterized in that described grid integration unit also comprises contactor, described contactor tandem reactor is on the loop of three phase network, described contactor comprises control end, and described control end is connected to a control signal output of fpga chip by the second control line.
8. a kind of parallel connection type active electric filter according to claim 1, it is characterized in that system running state collecting unit comprises heatsink temperature sensor, the operating state transducer of IGBT switch element, the DC bus overcurrent-overvoltage transducer of IGBT switch element, contactor temperature sensor, the system radiating fan running status transducer of IGBT switch element, and by the double operational filtering conditioning unit formed with each transducer double operational filtering one to one modulate circuit.
9. a kind of parallel connection type active electric filter according to claim 1, characterized by further comprising man-machine interface, described man-machine interface is a touch screen, it is communicated with dsp chip and/or fpga chip by RS485 interface, and described man-machine interface is in order to the parameter waveform of display system operating state, each index.
10. a kind of parallel connection type active electric filter according to claim 1, characterized by further comprising external communication interface, and described external communication interface adopts standard communication interface, to provide the passage run with the connection of top level control system and parallel operation.
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| CN104253440B (en) * | 2014-06-30 | 2016-04-27 | 南京亚派科技实业有限公司 | Based on the reactive power compensator with switching tube and the control method of CAN |
| CN105703753B (en) * | 2014-11-28 | 2019-03-08 | 西门子公司 | For the unbalanced current detection device of IGBT circuit, driver and the method for controlling IGBT circuit |
| CN104362759B (en) * | 2014-12-10 | 2017-01-11 | 国家电网公司 | Final power quality regulating and controlling device for power distribution network and regulating and controlling method |
| CN104485674A (en) * | 2014-12-18 | 2015-04-01 | 深圳市三和电力科技有限公司 | Dual-DSP high-speed static reactive generation module |
| CN104466967A (en) * | 2014-12-24 | 2015-03-25 | 安徽天沃电气技术有限公司 | Parallel-connection active power filter |
| CN104793079A (en) * | 2015-04-16 | 2015-07-22 | 上海理工大学 | Active power filter monitoring system |
| CN106877334A (en) * | 2017-03-27 | 2017-06-20 | 国家电网公司 | A kind of harmonic detecting compensation device based on FPGA |
| US10587119B2 (en) * | 2018-06-27 | 2020-03-10 | Schneider Electric USA, Inc. | Active power filter with adjustable neutral current limit |
| CN108879961A (en) * | 2018-07-26 | 2018-11-23 | 艾恩格电气（珠海）有限公司 | A kind of long-distance monitoring method for Active Power Filter-APF, apparatus and system |
| CN112003183B (en) * | 2020-08-06 | 2021-08-10 | 河南省同信电力工程有限公司 | Power transmission network fault processing system and method |
| CN113759808A (en) * | 2021-09-29 | 2021-12-07 | 湖北三江航天万峰科技发展有限公司 | Fan monitoring system, method and device and computer storage medium |
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| US8390149B2 (en) * | 2007-12-24 | 2013-03-05 | United Technologies Corporation | Harmonic filter with integrated power factor correction |
| CN202309072U (en) * | 2011-08-22 | 2012-07-04 | 江苏德顺祥电气有限公司 | Control device of modularized active filter |
| CN102931660B (en) * | 2012-11-15 | 2015-12-23 | 国电南京自动化股份有限公司 | The accurate proportional resonant control method of parallel connection type active electric filter |
| CN103023344B (en) * | 2012-12-25 | 2015-11-18 | 珠海万力达电气自动化有限公司 | A kind of general intelligent grid power electronic equipment |
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