CN203942283U - A kind of three-phase steady state voltage quality control apparatus - Google Patents
A kind of three-phase steady state voltage quality control apparatus Download PDFInfo
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- CN203942283U CN203942283U CN201420318407.4U CN201420318407U CN203942283U CN 203942283 U CN203942283 U CN 203942283U CN 201420318407 U CN201420318407 U CN 201420318407U CN 203942283 U CN203942283 U CN 203942283U
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The utility model discloses a kind of three-phase steady state voltage quality control apparatus, this device is made up of primary system and electrical secondary system, and wherein primary system comprises rectification side AC inductance, three-phase voltage source type rectifier, DC support electric capacity, three-phase voltage source type inverter, output LC filter and isolating transformer; Electrical secondary system comprises TMS320F28335 control core, Ethernet communication circuit, signal conditioning circuit, driving isolation circuit and man-machine interaction circuit.The utility model adopts the voltage-source type converter of two back to back structure, be serially connected between electrical network and user, convert by AC/DC/AC, effectively isolation electrical network and user's voltage, suppress influencing each other between electrical network and user, the multiple steady state voltage quality problems such as comprehensive regulation three-phase voltage is asymmetric, voltage harmonic, voltage fluctuation and deviation, have that input power factor is high, current harmonics is little, resist the premium properties of the strong and rapid dynamic response speed of load variations ability.
Description
Technical field
The utility model relates to the control device technical field of the quality of power supply, especially relates to a kind of three-phase steady state voltage quality control apparatus.
Background technology
Along with socioeconomic development, social need for electricity increases, and electrical network scale constantly expands, structure is day by day complicated, loads of a great variety, thereby causes the quality of voltage problem in electrical network more and more.
User is more and more higher to the requirement of quality of voltage now.Modern enterprise adopts advanced digital automatic control equipment and computer management means in a large number, as: precise numerical control machine, high precision measuring instrument, Programmable Logic Controller, frequency control equipment, automatic production line, computer information management system etc.These equipment and computer control system require electrical network that the electric energy of high-quality is provided, otherwise, in process of production, any quality of voltage problems such as three-phase imbalance, harmonic wave, voltage deviation and fluctuation and flickering all may cause the decline of product quality, even can cause the disorder of management order, cause serious economic loss and severe social influence.
Conventional power quality adjusting device can solve most of Steady state and transient state quality of voltage problem at present.For the design of integrated voltage quality problems, especially often there is for the controlling device of transient voltage quality problems design the feature that investment is excessive, control is comparatively complicated.And be generally to design for a certain specific power quality problem for the controlling device of steady state voltage quality problems design, as harmonic problem, voltage deviation problem, three-phase imbalance problem etc., and can there is the undesirable defect of regulation effect in the cheap controlling device of part.And in engineering reality, the comprehensively appearance, interactional often of the quality of voltage problem of these stable states, therefore need be for comprehensive steady state voltage quality problems, design a kind of controlling device of superior performance.
Utility model content
The purpose of this utility model is that the shortcoming that overcomes prior art is with not enough, a kind of three-phase steady state voltage quality control apparatus is provided, comprehensive solve the overvoltage/under voltage, frequency fluctuation, voltage fluctuation and the flickering that occur in electrical network, containing many electric energy problems such as a large amount of harmonic waves and imbalance of three-phase voltage, output three-phase symmetrical and stable sinusoidal voltage; Can also suppress harmonic current and the impact of low power factor on electrical network that nonlinear load produces, improve the operational efficiency of electric power system and ensure that user is reliable, the electricity consumption of high-quality.
The purpose of this utility model is achieved through the following technical solutions:
A kind of three-phase steady state voltage quality control apparatus, be serially connected between electrical network and user, comprehensive regulation three-phase voltage is asymmetric, voltage harmonic, voltage fluctuation and the relevant steady state voltage quality problems of deviation, and described control device is made up of primary system and electrical secondary system;
Primary system comprises rectification side AC inductance, three-phase voltage source type rectifier, DC support electric capacity, three-phase voltage source type inverter, output LC filter and isolating transformer;
Electrical secondary system comprises TMS320F28335 control core, Ethernet communication circuit, signal conditioning circuit, drive circuit, buffer circuit and man-machine interaction circuit; Wherein three-phase voltage source type rectifier is connected with three phase network by rectification side AC inductance; Three-phase voltage source type rectifier is also connected with three-phase voltage source type inverter by DC side Support Capacitor; Three-phase voltage source type inverter is connected to isolating transformer by output LC filter; Isolating transformer output connects load; The voltage, the current signal that collect are connected to TMS320F28335 control core by signal conditioning circuit; TMS320F28335 control core is connected respectively to three-phase voltage source type rectifier and three-phase voltage source type inverter by drive circuit;
Fault-signal is connected to TMS320F28335 control core by buffer circuit;
TMS320F28335 control core carries out information interaction by Ethernet communication circuit interconnection network;
Man-machine interaction circuit is connected and shows and instruction modification with TMS320F28335 control core.
Preferably, described TMS320F28335 control core adopts the digital signal processor TMS320F28335 controller of TI company, and integrated decoding circuit, data buffer circuit, external crystal oscillation circuit, clock circuit, external data and program storing circuit.
Preferably, the voltage, current signal that after described collection and by signal conditioning circuit, are transferred to TMS320F28335 control core are respectively from net side three-phase input voltage current sample, DC voltage current sample and inversion side three-phase output voltage current sample.
Preferably, the power device of described three-phase voltage source type rectifier and three-phase voltage source type inverter adopts Intelligent Power Module.
Preferably, described Ethernet communication circuit comprises the KSZ8862-16MQL chip of MICREL company.
Preferably, described Ethernet communication circuit has 100,000,000 fiber optic Ethernet mouths and two kinds of dissimilar Ethernet interfaces of 10,000,000 electric Ethernet interfaces.
Preferably, described drive circuit adopts high speed photo coupling HCPL-2601, and pwm pulse signal, killer switch control command are isolated and amplified.
Preferably, described buffer circuit adopts common optical coupler 4N25, isolated fault input signal.
Preferably, described man-machine interaction circuit, adopts six matrix LCD TFT-G320240DTSW-32W-E that touch fine motion button, six LED and 320 × 240.
The utility model has following advantage and effect with respect to prior art:
1. the comprehensive quality of voltage problems such as simultaneous three-phase imbalance, voltage deviation, voltage fluctuation and flickering, harmonic wave that solve in electrical network, adjustable range is large, improvement voltage deviation reaches rated voltage ± 40%, can also stablize control to the electric voltage frequency of fluctuation, output three-phase symmetrical and stable power frequency sinusoidal voltage, improve quality of voltage, ensure rate of qualified voltage, ensure that user is reliable, the electricity consumption of high-quality.
2. suppress harmonic current and the impact of low power factor on electrical network that nonlinear load produces, device operating efficiency is high, improves the operational efficiency of electric power system.
3. can resist load disturbance, Harmonics of Input content is low and power factor is high, device fast response time.
4. can provide if desired reactive power compensation, the no-power vacancy of the unnecessary idle or bucking-out system of absorption system.
5. between the equipment that can realize and put into operation, carry out seamless information interaction, effectively avoid problems such as " information islands ", realize the overall situation of information and share, traffic department can unify regulation and control.
Brief description of the drawings
Fig. 1 is the structure chart of device of the present utility model;
Fig. 2 is the device main circuit topology of utility model and the structure chart of control system hardware platform;
Fig. 3 is Ethernet communication circuit structure chart of the present utility model;
In figure, Reference numeral is: 1-rectification side AC inductance, 2-three-phase voltage source type rectifier, 3-DC support electric capacity, 4-three-phase voltage source type inverter, 5-output LC filter, 6-isolating transformer, 7-TMS320F28335 control core, 8-Ethernet communication circuit, 9-signal conditioning circuit, 10-1-buffer circuit, 10-2-drive circuit, 11-man-machine interaction circuit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
The utility model provides a kind of three-phase steady state voltage quality control apparatus, the structure of this device as shown in Figure 1, three-phase steady state voltage quality control apparatus described in the utility model is serially connected between generators and loads, 1. grid voltage quality exceeds standard, through the AC/DC conversion of rectifier and the DC/AC conversion of three inverters, then give load power supply by three-phase isolation transformer and output switch.2. grid voltage quality is in acceptability limit, automatic switchover by-pass switch closure, and electrical network is directly given load power supply.When device maintenance and fault, power switch disconnects, manually the closed uninterrupted power supply of loading that ensures of maintenance bypass switch.
Fig. 2 is the device main circuit topology of utility model and the structure chart of control system hardware platform.The power device of three-phase voltage source type rectifier and three-phase voltage source type inverter all adopts Intelligent Power Module.Between three phase mains and three-phase voltage source type rectifier, connect and access precharge current-limiting resistance and three-phase ac contactor, rectification side AC inductance in parallel thereof, three-phase voltage source type rectifier DC side is parallel with DC support electrochemical capacitor, be connected with the DC side of three-phase voltage source type inverter, the inversion side of three-phase voltage source type inverter is through LC filter circuit and three-phase isolation transformer, output three-phase voltage, gives load power supply.Control system hardware platform comprises TMS320F28335 control core, Ethernet communication circuit, signal conditioning circuit, driving isolation circuit, man-machine interaction circuit.Described TMS320F28335 control core is characterised in that adopting the 32 floating-point operation digital signal processor TMS320F28335 that arithmetic speed is 150MHz is master control core, arranged the FLASH of (1M+256K) × 16 simultaneously, (1M+34K) RAM of × 16, can carry out the storage of program and a large amount of sampled datas, and 8 bit decoder Interface realizations extend out FLASH, RAM, LCD display is multiplexing to data wire; Data buffer has strengthened the driving force of TMS320F28335 output.Net side three-phase input voltage electric current six road ac sampling signals and DC voltage and current direct current are sampled through signal conditioning circuit, input to processor TMS320F28335, adopt the two closed loop PI regulating and controlling of ring in direct voltage outer shroud input current, call SVPWM generating algorithm, utilize tri-modules of EPWM1/2/3 of TMS320F28335, send six road pulse signal control three-phase voltage source type rectifiers, realize the stable of direct voltage and unity power factor operation, and device does not produce harmonic wave.Inversion side three-phase output voltage electric current six road ac sampling signals are through modulate circuit, input to processor TMS320F28335, utilize the two closed loop PI regulating and controlling of ring in output voltage outer ring output current, adopt SVPWM modulation algorithm, by tri-modules of EPWM4/5/6 of TMS320F28335, send six road pulse signal control three-phase voltage source type inverters, realize output three-phase symmetrical and stable sinusoidal voltage.
Intelligent Power Module (the Intelligent Power Module all adopting in above-mentioned three-phase voltage source type rectifier and three-phase voltage source type inverter; IPM); it is by IGBT and additional device and its protection and drive circuit encapsulation and integration; reduce the volume of device; greatly reduce line inductance; be suitable for higher operating frequency, compared with common IGBT module, IPM increases in systematic function and reliability.
The isolated drive circuit of the control system hardware platform of described three-phase steady state voltage quality control apparatus of the present utility model, on the one hand by PWM control wave, power switch, output switch, automatic switchover by-pass switch turn on and off that signal is isolated by rapid light coupling HCPL-2601 and the amplification of signal, strengthen the driving force of TMS320F28335 control signal; The fault output signal of the power device itself of three-phase voltage source type rectifier and three-phase voltage source type inverter on the other hand, via common optical coupler, 4N25 isolates, and is input to processor TMS320F28335, realizes the reliable locking of corresponding PWM control impuls.
The man-machine interaction circuit of the control system hardware platform of described three-phase steady state voltage quality control apparatus of the present utility model, adopt six instruction definite values of touching fine motion button and carrying out manual adjustments TMS320F28335 storage, the data such as the operating state of the matrix LCD TFT-G320240DTSW-32W-E display unit by six LED and 320 × 240 and each voltage, electric current, power.
Fig. 3 is the too Netcom news circuit structure diagram of three-phase steady state voltage quality control apparatus of the present utility model, described Ethernet communication circuit is characterised in that and is provided with 2 Ethernet interfaces, 100,000,000 fiber optic Ethernet mouths and 10,000,000 electric Ethernet interfaces, bus design is 16.Ethernet controller adopts KSZ8862-16MQL-FX, is the non-pci interface controller designing for built-in applied system.On KSZ8862-16MQL-FX chip, integrated MAC layer MAC and the physical layer PHY of CSMA/CD agreement, meets IEEE802.3/802.3u-100Base-TX/10Base-T specification.
When TMS302F28335 uses the universal standard, ordered pair KSZ8862-16MQL-FX controller carries out read-write operation, and the RDN of KSZ8862-16MQL-FX and WRN pin are directly controlled by TMS302F28335's
xR/
control signal.KSZ8862-16MQL-FX receives data, and pin INTRN sends interrupt requests to TMS302F28335, triggers the external interrupt of TMS302F28335, carries out interrupt response deal with data.
KSZ8862-16MQL-FX uses external crystal-controlled oscillation source, and crystal oscillator frequency is 25MHz, by its internal register addressing to carry out various operations.15 bit address pin A1～A15 of KSZ8862-16MQL-FX are connected with XA0～XA14 of TMS302F28335 respectively; 16 bit data bus D0～D15 of KSZ8862-16MQL-FX are connected with 16 EXD0～EXD15 in 32 bit data bus of TMS302F28335; The address enable pin AEN of KSZ8862-16MQL-FX is connected with the chip select line CS6 of main control module, and reset pin RSTN is connected with the pin GPIO49 of TMS302F28335.
A kind of three-phase steady state voltage of the utility model quality control apparatus also provides a set of control method, and described control method comprises:
Rectifier side control strategy adopts the two closed loop PI of the interior ring of direct voltage outer shroud input current to control and inverter side control strategy adopts the two closed loop PI of the interior ring of output voltage outer ring output current to control, and modulation system adopts space vector modulation.Realize that direct voltage is constant, output voltage meets quality of voltage requirement, and effectively reduce the harmonic wave amount of input current, improve the power factor of device, there is the feature fast that responds.
The soft start control technology of device, the startup stage of device, first rectifier does not control rectification, by precharge current-limiting resistance, DC support electric capacity is charged, and treats DC voltage stability, excision precharge current-limiting resistance, processor TMS320F28335 sends the control impuls of three-phase voltage source type rectifier and carries out controlled rectification, and direct current command voltage increases gradually, until while reaching final direct current command voltage value, start three-phase voltage source type inverter, so far device has started.
The stoppage in transit control technology of device, in the time that device is stopped transport, first the control impuls of locking three-phase voltage source type rectifier, disconnect power switch simultaneously, now three-phase voltage source type inverter keeps sending control impuls, and the electric energy of storing in the DC support electric capacity of releasing, until direct voltage drops at 1 o'clock, the control impuls locking of three-phase voltage source type inverter, so far device has been stopped transport.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (9)
1. a three-phase steady state voltage quality control apparatus, be serially connected between electrical network and user, comprehensive regulation three-phase voltage is asymmetric, voltage harmonic, voltage fluctuation and the relevant steady state voltage quality problems of deviation, it is characterized in that, described control device is made up of primary system and electrical secondary system;
Primary system comprises rectification side AC inductance (1), three-phase voltage source type rectifier (2), DC support electric capacity (3), three-phase voltage source type inverter (4), output LC filter (5) and isolating transformer (6);
Electrical secondary system comprises TMS320F28335 control core (7), Ethernet communication circuit (8), signal conditioning circuit (9), buffer circuit (10-1), drive circuit (10-2) and man-machine interaction circuit (11); Wherein
Three-phase voltage source type rectifier (2) is connected with three phase network by rectification side AC inductance (1);
Three-phase voltage source type rectifier (2) is also connected with three-phase voltage source type inverter (4) by DC side Support Capacitor (3);
Three-phase voltage source type inverter (4) is connected to isolating transformer (6) by output LC filter (5);
Isolating transformer (6) output connects load;
The voltage, the current signal that collect are connected to TMS320F28335 control core (7) by signal conditioning circuit (9);
TMS320F28335 control core (7) is connected respectively to three-phase voltage source type rectifier (2), DC support electric capacity (3) and three-phase voltage source type inverter (4) by drive circuit (10-2);
Fault-signal is connected to TMS320F28335 control core (7) by buffer circuit (10-1);
TMS320F28335 control core (7) carries out information interaction by Ethernet communication circuit (8) interconnection network;
Man-machine interaction circuit (11) is connected and shows and instruction modification with TMS320F28335 control core (7).
2. a kind of three-phase steady state voltage quality control apparatus according to claim 1, it is characterized in that, described TMS320F28335 control core adopts the digital signal processor TMS320F28335 controller of TI company, and integrated decoding circuit, data buffer circuit, external crystal oscillation circuit, clock circuit, external data and program storing circuit.
3. according to a kind of three-phase steady state voltage quality control apparatus claimed in claim 1, it is characterized in that, the voltage, current signal that after described collection and by signal conditioning circuit (9), are transferred to TMS320F28335 control core are respectively from net side three-phase input voltage current sample, DC voltage current sample and inversion side three-phase output voltage current sample.
4. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, the power device of described three-phase voltage source type rectifier and three-phase voltage source type inverter adopts Intelligent Power Module.
5. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, described Ethernet communication circuit comprises the KSZ8862-16MQL chip of MICREL company.
6. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, described Ethernet communication circuit has 100,000,000 fiber optic Ethernet mouths and two kinds of dissimilar Ethernet interfaces of 10,000,000 electric Ethernet interfaces.
7. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, described drive circuit adopts high speed photo coupling HCPL-2601, and pwm pulse signal, killer switch control command are isolated and amplified.
8. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, described buffer circuit adopts common optical coupler 4N25, isolated fault input signal.
9. according to the arbitrary described a kind of three-phase steady state voltage quality control apparatus of claim 1 or 2, it is characterized in that, described man-machine interaction circuit, adopts six matrix LCD TFT-G320240DTSW-32W-E that touch fine motion button, six LED and 320 × 240.
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| CN201420318407.4U CN203942283U (en) | 2014-06-13 | 2014-06-13 | A kind of three-phase steady state voltage quality control apparatus |
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| CN201420318407.4U CN203942283U (en) | 2014-06-13 | 2014-06-13 | A kind of three-phase steady state voltage quality control apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226656A (en) * | 2015-10-22 | 2016-01-06 | 苏州华安普电力科技股份有限公司 | A kind of multiple-harmonic-source harmonic shielding system |
| CN106205308A (en) * | 2016-08-08 | 2016-12-07 | 中车株洲电力机车研究所有限公司 | A kind of electrical network analog systems and control method thereof |
| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
| CN107147095A (en) * | 2017-05-25 | 2017-09-08 | 华中科技大学 | A kind of direct current and spuious harmonic current of suppressing is into the device of transformer neutral point |
| CN107394789A (en) * | 2017-09-07 | 2017-11-24 | 中国石油天然气集团公司 | A kind of Intelligent Dynamic voltage restorer |
| US9929665B2 (en) | 2016-04-20 | 2018-03-27 | International Business Machines Corporation | Remotely controllable modular power control device for power generation |
| CN107910868A (en) * | 2017-12-10 | 2018-04-13 | 国网福建华安县供电有限公司 | Outdoor series voltage quality regulating device |
| CN108075671A (en) * | 2016-11-10 | 2018-05-25 | 中电普瑞科技有限公司 | A kind of flickering isolating device |
| CN108683199A (en) * | 2018-04-18 | 2018-10-19 | 哈尔滨理工大学 | The static stable-pressure device of three-phase intelligent circuit and method for stabilizing voltage |
-
2014
- 2014-06-13 CN CN201420318407.4U patent/CN203942283U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226656A (en) * | 2015-10-22 | 2016-01-06 | 苏州华安普电力科技股份有限公司 | A kind of multiple-harmonic-source harmonic shielding system |
| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
| US9929665B2 (en) | 2016-04-20 | 2018-03-27 | International Business Machines Corporation | Remotely controllable modular power control device for power generation |
| CN106205308A (en) * | 2016-08-08 | 2016-12-07 | 中车株洲电力机车研究所有限公司 | A kind of electrical network analog systems and control method thereof |
| CN108075671A (en) * | 2016-11-10 | 2018-05-25 | 中电普瑞科技有限公司 | A kind of flickering isolating device |
| CN107147095A (en) * | 2017-05-25 | 2017-09-08 | 华中科技大学 | A kind of direct current and spuious harmonic current of suppressing is into the device of transformer neutral point |
| CN107394789A (en) * | 2017-09-07 | 2017-11-24 | 中国石油天然气集团公司 | A kind of Intelligent Dynamic voltage restorer |
| CN107910868A (en) * | 2017-12-10 | 2018-04-13 | 国网福建华安县供电有限公司 | Outdoor series voltage quality regulating device |
| CN108683199A (en) * | 2018-04-18 | 2018-10-19 | 哈尔滨理工大学 | The static stable-pressure device of three-phase intelligent circuit and method for stabilizing voltage |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 Termination date: 20170613 |