CN101022218A - Medium-voltage hybrid active power filter - Google Patents
Medium-voltage hybrid active power filter Download PDFInfo
- Publication number
- CN101022218A CN101022218A CNA2006101555046A CN200610155504A CN101022218A CN 101022218 A CN101022218 A CN 101022218A CN A2006101555046 A CNA2006101555046 A CN A2006101555046A CN 200610155504 A CN200610155504 A CN 200610155504A CN 101022218 A CN101022218 A CN 101022218A
- Authority
- CN
- China
- Prior art keywords
- voltage
- filter
- voltage source
- phase
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 230000002459 sustained effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005094 computer simulation Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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]
Landscapes
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a technical scheme of a medium-voltage hybrid active power filter, which relates to the technical field of circuit devices of an alternating current distribution network and comprises a low-voltage three-phase voltage source inverter, wherein the main body of the low-voltage three-phase voltage source inverter is a three-phase bridge inverter circuit formed by connecting six Insulated Gate Bipolar Transistors (IGBT) in an anti-parallel connection freewheeling diodes (D), a trigger pin of the Insulated Gate Bipolar Transistors (IGBT) in the low-voltage three-phase voltage source inverter is correspondingly connected with a trigger terminal of an APF (active power filter) controller, the output end of the low-voltage three-phase voltage source inverter is connected with a voltage high-frequency filter and a medium-voltage power capacitor in series and. The invention abandons the conventional design idea of common technicians, has simple and reasonable structure, small product volume, low manufacturing cost, high-efficiency filtering function and high reliability, and overcomes the defects of extremely high manufacturing cost of a pure active filter and complex structure and low reliability of the traditional mixed active filter.
Description
Technical field
The present invention relates to the circuit arrangement technical field of ac distribution network, be specifically related to a kind of hybrid power filter.
Background technology
Development along with power electronic technology; RHVC; intermediate frequency furnace; the high power DC electrolysis unit; the milling train drive apparatus of steel industry; alternating current-direct current electric arc furnace apparatus; a large amount of high power electronic equipments such as pulling equipment of electric railway locomotive have obtained using widely; very big energy-conserving action has been played in the application of these power electronic equipments; but also electric power system is brought very big harmonic pollution simultaneously; cause the power supply quality to decline to a great extent; transformer; the equipment for power transmission and distribution losts of life such as switch; and cause other power consumption equipment cisco unity malfunctions; the protection misoperation; apparatus overload; overheated; harmful effects such as grid power loss increase, thus to the demand of power network harmonic wave management also in continuous increase.
At present, harmonic treating apparatus in the world can be divided into two big class, i.e. passive filtration unit and active filters.Wherein passive filtration unit mainly is made up of reactance and electric capacity, by selecting suitable reactance and capacitance, its impedance is almost nil under a certain subfrequency, thereby this subharmonic current in the load all flows into this L-C circuit basically, reaches the purpose of this subharmonic current of filtering.Usually power electronic equipment can produce harmonic current many times, so passive filter is typically provided with a plurality of L-C filtering channels, and each passage is tuned on the different harmonic frequencies, reaches the main harmonic current that the filtering nonlinear load is produced.Passive filter has following generally acknowledged shortcoming:
1. equipment heaviness, floor space is big;
2. filtering performance is subjected to the influence of power system impedance.Under extreme case, the possible and system impedance generation harmonic resonance of the L-C circuit of filter, thus suffer the superpotential damage of harmonic wave;
3. near the influence of other harmonic sources harmonic current load is subjected to, near the fractional harmonic electric current of harmonic source just absorbing, thus cause overload, cause device damage or life-span to be reduced.
Active filter is divided into pure active filter and hybrid active filter two classes.Pure active filter is made of a voltage source formula inverter and output high frequency filter, by control inverter mesohigh power semiconductor switches, open/break operation as insulated gate bipolar transistor IGBT, inject harmonic current to electrical network, to offset the harmonic current of nonlinear load, reach the purpose of filtering.The effect of inverter output end high frequency filter is that filtering is the switching frequency harmonic voltage because of IGBT opens/break the high frequency that produces fast, so this high frequency filter is constituted or is made of a LCL circuit by a simple reactor usually.Compare with passive filter, the pure active filter of this class has following advantage: in light weight, volume is little, filtering performance is not influenced by system impedance, can not produce resonance, the harmonic current load is not subjected near the influence of harmonic source etc., thereby is applied gradually in low voltage electric network.The major defect of such active filter is that the fundamental voltage of electrical network all is applied on the inverter, in the time of in receiving the 3kV-35kV medium voltage network, must adopt the series connection of a plurality of insulated gate bipolar transistor IGBTs and form the unit switch of a fundamental voltage of anti-the electrical network, thereby cause cost high, can not in medium voltage network, be applied.
In order to overcome above-mentioned shortcoming, many domestic and international research mechanisms and R﹠D institution of university have proposed another kind of active filter structure---and be so-called hybrid active filter.Though this class hybrid active filter has multiple different topological structure, but has common trait, the passive filter that is about to mesohigh with connect by the low-voltage active filter of coupling transformer after insert electrical network again, thereby reach all advantages of pure active filter, avoided simultaneously using a large amount of high-tension electricity semiconductor switchs, as insulated gate bipolar transistor IGBT.But a common drawback of this type of hybrid active filter is the structure more complicated, and system's building block is more.As " the electric railway parallel connection mixed type electric-power filter " that the patent No. 03134614.6 Chinese invention patent proposes, its active filter is by a coupling transformer and an additional reactance parallel connection, and series connection inserts electrical network with passive filter again; " mode of resonance hybrid active electric filter and the control method thereof " that the patent No. 03128234.2 Chinese invention patent proposes, its active filter is by in parallel with one " L-C " series resonant circuit behind the coupling transformer, connects with power capacitor and inserts electrical network; " hybrid filter that is used for AC network " that the patent No. 99807794.1 Chinese invention patents propose, its active filter are connected with passive filter and are inserted electrical network by in parallel with one " L-C " series resonant circuit behind the coupling transformer.
Summary of the invention
The present invention aim to provide a kind of simple in structure, system's building block is few, reliability is high, is applicable to the technical scheme of the hybrid active electric filter of medium voltage network, to overcome the defective that exists in the prior art.
Press hybrid active electric filter in described, comprise a low pressure three-phase voltage source formula inverter, the three-phase inverter bridge circuit of main body for connecting and composing by six insulated gate bipolar transistor IGBT inverse parallel sustained diode pipes, it is characterized in that the corresponding connection of triggering pin of the insulated gate bipolar transistor IGBT in the low pressure three-phase voltage source formula inverter with the trigger terminal of APF controller, insert electrical network behind low pressure three-phase voltage source formula inverter output end serial connection voltage high frequency filter, the medium voltage electricity capacitor, the APF controller inserts electrical network by reducing transformer.
Press hybrid active electric filter in described, it is characterized in that described voltage high frequency filter is reactor or is made of the LCL circuit
Press hybrid active electric filter in described, it is characterized in that the voltage source of described low pressure three-phase voltage source formula inverter is direct current capacitor Cdc.
Press hybrid active electric filter in described, it is characterized in that described APF controller is connected and composed by phase-locked loop module PLL, harmonic current detection module, harmonic current control module, inverter direct-current voltage control module, pwm signal generation module.
Press hybrid active electric filter in described, abandon the usual mentality of designing of those skilled in the art, adopt low pressure three-phase voltage source formula inverter serial connection voltage high frequency filter, medium voltage electricity capacitor to insert the syndeton of electrical network, simple and reasonable, small product size is little, low cost of manufacture, has filter function efficiently, the reliability height has overcome the high and conventional hybrid active filter complex structure of the manufacturing cost of pure active filter, defective that reliability is low.
Description of drawings
Figure 1 shows that electrical block diagram of the present invention;
Figure 2 shows that the structured flowchart of controller;
Fig. 3, Fig. 4, Fig. 5, Fig. 6 are respectively load current waveform figure, filter current waveform figure, inverter direct-current voltage oscillogram, the system power oscillogram of Computer Simulation.
Embodiment
The invention will be further described below in conjunction with Figure of description.
Middle pressure hybrid active electric filter as shown in Figure 1, 2, comprise a low pressure three-phase voltage source formula inverter 5, the three-phase inverter bridge circuit of main body for being connected and composed by six insulated gate bipolar transistor IGBT inverse parallel sustained diode, the voltage source of low pressure three-phase voltage source formula inverter 5 is direct current capacitor C
DcAs voltage source, the corresponding connection of the triggering pin of the insulated gate bipolar transistor IGBT 11 in the low pressure three-phase voltage source formula inverter 5 with the trigger terminal of APF controller 1, low pressure three-phase voltage source formula inverter 5 outputs serial connection voltage high frequency filter 4, electrical network is inserted in medium voltage electricity capacitor 3 backs, voltage high frequency filter 4 can constitute for reactor or by the LCL circuit, APF controller 1 inserts electrical network by reducing transformer 2, APF controller 1 is by phase-locked loop module PLL6, harmonic current detection module 7, harmonic current control module 8, pwm signal generation module 10, inverter direct-current voltage control module 9 connects and composes, the input of phase-locked loop module PLL6 is a bus voltage signal, its output is mains frequency, the voltage phase angle signal, the input of harmonic current detection module 7 is system power signal and phase angle signal, its output is the harmonic component in the electric current, the input signal of harmonic current control module 8 is harmonic current signals, its output is the PWM modulated voltage signal after the output addition with the direct voltage control module, the input of pwm signal generation module 10 is modulated voltage signals, its output is that pwm signal is in order to trigger the insulated gate bipolar transistor IGBT 11 in the low pressure three-phase voltage source formula inverter 5, the input of inverter direct-current voltage control module 9 is differences of the voltage and the voltage setting value of actual DC capacitor, produce output signal behind the proportional integral device PI in low pressure three-phase voltage source formula inverter 5, this signal is transformed into behind the fundamental signal output addition with the harmonic current control module, constitutes modulated voltage signal.
Reactance in the high frequency filter 4 and medium voltage electricity capacitor 3 can be tuned to certain subharmonic during design, constitute passive L-C filter, like this, hinder for some reason and during by bypass, press hybrid active electric filter still can play certain filter action in this at inverter 5.
After should middlely pressing hybrid active electric filter to insert electrical network, fundamental voltage in the electrical network all is applied on the medium voltage electricity capacitor 3, because of capacitor is Low ESR under high-frequency, 5 of low pressure three-phase voltage source formula inverters need to produce the harmonic voltage more much lower than electrical network fundamental voltage just can produce required harmonic current, flow into the harmonic current that electrical network is offset nonlinear load by medium voltage electricity capacitor 3, reach the purpose of filtering, thereby the direct voltage in the low pressure three-phase voltage source formula inverter 5 is much lower than the electrical network fundamental voltage, further specifies in conjunction with the computer system simulation example.
The Computer Simulation example:
1. compound filter parameter:
Power capacitor 38 μ F, High frequency filter reactor 7.2mH, inverter direct current capacitor 2mF, inverter direct-current voltage set point 1000V;
2. system parameters:
Line voltage 6kV, mains frequency 50HZ, grid short circuit capacity 72MVA;
3. load parameter:
The three-phase diode rectification circuit, the reactance of input AC side is 4mH;
The resistance series connection of the reactance of DC side load: 200mH and 80 Ω.
4. simulation result:
Load current waveform such as Fig. 3, THD=25%;
Filter current waveform such as Fig. 4, fundamental current=31Arms;
Inverter direct-current voltage waveform such as Fig. 5;
System power waveform such as Fig. 6, THD=4.6%.
Claims (4)
1. middle pressure hybrid active electric filter, comprise a low pressure three-phase voltage source formula inverter (5), the three-phase inverter bridge circuit of main body for connecting and composing by six insulated gate bipolar transistor IGBT inverse parallel sustained diode, the triggering pin and the corresponding connection of the trigger terminal of APF controller (1) that it is characterized in that the insulated gate bipolar transistor IGBT (11) in the low pressure three-phase voltage source formula inverter (5), low pressure three-phase voltage source formula inverter (5) output serial connection voltage high frequency filter (4), electrical network is inserted in medium voltage electricity capacitor (3) back, and APF controller (1) inserts electrical network by reducing transformer (2).
2. press hybrid active electric filter in as claimed in claim 1, it is characterized in that described voltage high frequency filter (4) constitutes for reactor or by the LCL circuit.
3. press hybrid active electric filter in as claimed in claim 1, the voltage source that it is characterized in that described low pressure three-phase voltage source formula inverter (5) is direct current capacitor C
Dc
4. press hybrid active electric filter in as claimed in claim 1, it is characterized in that described APF controller (1) is connected and composed by phase-locked loop module PLL (6), harmonic current detection module (7), harmonic current control module (8), inverter direct-current voltage control module (9), pwm signal generation module (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101555046A CN100477442C (en) | 2006-12-27 | 2006-12-27 | Medium-voltage hybrid active power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101555046A CN100477442C (en) | 2006-12-27 | 2006-12-27 | Medium-voltage hybrid active power filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101022218A true CN101022218A (en) | 2007-08-22 |
| CN100477442C CN100477442C (en) | 2009-04-08 |
Family
ID=38709900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101555046A Expired - Fee Related CN100477442C (en) | 2006-12-27 | 2006-12-27 | Medium-voltage hybrid active power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100477442C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097824A (en) * | 2010-12-31 | 2011-06-15 | 华中科技大学 | Control method of LCL (Lower Control Limit) type grid-connected inverter for restricting influence of grid voltage on grid-connected current |
| CN102386910A (en) * | 2011-07-27 | 2012-03-21 | 江苏物联网研究发展中心 | Novel gate modulation reading circuit structure |
| CN102611117A (en) * | 2012-02-29 | 2012-07-25 | 澳门大学 | LC-VSI device reactive compensation control method based on self-adaptive control DC side voltage |
| CN104993485A (en) * | 2015-06-26 | 2015-10-21 | 西安理工大学 | Parallel hybrid active filtering system and control method therefor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5513090A (en) * | 1994-11-15 | 1996-04-30 | Electric Power Research Institute, Inc. | Hybrid series active, parallel passive, power line conditioner for harmonic isolation between a supply and a load |
| CN1309141C (en) * | 2004-01-07 | 2007-04-04 | 浙江大学 | Control method of series mixed active power filter having base wave by-pass channel |
| CN100355177C (en) * | 2005-12-18 | 2007-12-12 | 江苏省电力公司无锡供电公司 | Mixed THF based on symmetrical component method |
| CN201008098Y (en) * | 2006-12-27 | 2008-01-16 | 梁一桥 | Medium voltage mixed active electric power filter |
-
2006
- 2006-12-27 CN CNB2006101555046A patent/CN100477442C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097824A (en) * | 2010-12-31 | 2011-06-15 | 华中科技大学 | Control method of LCL (Lower Control Limit) type grid-connected inverter for restricting influence of grid voltage on grid-connected current |
| CN102386910A (en) * | 2011-07-27 | 2012-03-21 | 江苏物联网研究发展中心 | Novel gate modulation reading circuit structure |
| CN102386910B (en) * | 2011-07-27 | 2016-05-04 | 江苏物联网研究发展中心 | A kind of Novel gate modulation reading circuit structure |
| CN102611117A (en) * | 2012-02-29 | 2012-07-25 | 澳门大学 | LC-VSI device reactive compensation control method based on self-adaptive control DC side voltage |
| CN102611117B (en) * | 2012-02-29 | 2014-09-10 | 澳门大学 | LC-VSI device reactive compensation control method based on self-adaptive control DC side voltage |
| CN104993485A (en) * | 2015-06-26 | 2015-10-21 | 西安理工大学 | Parallel hybrid active filtering system and control method therefor |
| CN104993485B (en) * | 2015-06-26 | 2017-08-22 | 西安理工大学 | A kind of Shunt Hybrid Active Power Filter system and its control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100477442C (en) | 2009-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104578865B (en) | A kind of T-shaped fault-tolerant current transformer of three level four bridge legs and its control method | |
| CN103441691B (en) | A kind of mode of resonance electronic power convertor and converter device | |
| CN102195289A (en) | Cascade-structure-based hybrid active power filter | |
| CN105743352B (en) | A kind of the bidirectional, dc transformer and its control method of improved switching capacity access | |
| KR20100017730A (en) | Common mode filter system and method for a solar power inverter | |
| CN104702114A (en) | Switch capacitance access high frequency bi-directional DC (direct current) transformer and control method thereof | |
| CN104852583A (en) | High-frequency link multi-level direct-current transformer used for middle- low-voltage direct current distribution | |
| CN101795080A (en) | Three-phase power electronics transformer for power distribution | |
| CN100372208C (en) | Three-phase unified electric energy quality controller without isolation link | |
| US11967859B2 (en) | Power factor correction circuit, power factor correction assembly and on-line uninterruptible power supply comprising same | |
| Parashar et al. | High power medium voltage converters enabled by high voltage SiC power devices | |
| CN105071679A (en) | Five-level self-balanced inverter based on bridge switched capacitor module | |
| CN100477442C (en) | Medium-voltage hybrid active power filter | |
| CN108233396A (en) | A kind of Unified Power Quality Controller and its control method with light storage unit | |
| CN102638047A (en) | Three-phase unified power quality control device with bypass switches | |
| CN101364736B (en) | Series hybrid active electric filter device | |
| CN2796213Y (en) | Mixed high power active power filter | |
| Palanisamy et al. | A new three-level three-phase boost PWM inverter for PV applications | |
| CN204578373U (en) | A kind of High Frequency Link many level DCs transformer for mesolow DC distribution | |
| CN201008098Y (en) | Medium voltage mixed active electric power filter | |
| CN108258697B (en) | Energy router for comprehensive management of electric energy quality and power optimization | |
| CN201282339Y (en) | Series hybrid active electric filter device | |
| CN207939209U (en) | The energy router of power quality harnessed synthetically and power optimization | |
| CN102684182B (en) | Arc extinction grounding device | |
| CN1172417C (en) | High voltage large power uninterrupted power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20070831 Address after: No. 16, 202, Kang Yuan Garden, Huanglong residential area, Lucheng District, Wenzhou, Zhejiang Applicant after: Liang Yiqiao Address before: No. 12, No. 15, Hangzhou economic and Technological Development Zone (Xiasha), Hangzhou, Zhejiang Applicant before: ANTE POWER ELECTRONIC TECHNOLOGY Co.,Ltd. HANGZHOU |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG XIEPING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: LIANG YIQIAO Effective date: 20110616 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 325000 NO. 202, BUILDING 16, KANGYUAN, HUANGLONG RESIDENTIAL QUARTER, LUCHENG DISTRICT, WENZHOU CITY, ZHEJIANG PROVINCE TO: 310030 NO. 210, ZHENHUA ROAD, XIHU SCIENCE AND TECHNOLOGY PARK, SANDUN, XIHU DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20110616 Address after: 310030, Zhenhua Road, three pier West Lake Science Park, Hangzhou, Zhejiang, Xihu District 210, China Patentee after: ZHEJIANG XIEPING TECHNOLOGY Co.,Ltd. Address before: 325000, No. 16, 202, Kang Yuan Garden, Huanglong residential area, Lucheng District, Wenzhou, Zhejiang Patentee before: Liang Yiqiao |
|
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG GUIRONG XIEPING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHEJIANG XIEPING TECHNOLOGY CO., LTD. Effective date: 20110920 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110920 Address after: 2 Building 2, 210 Zhenhua Road, 310030, Zhejiang, Hangzhou, Xihu District Patentee after: ZHEJIANG GUIRONG XIEPING TECHNOLOGY Co.,Ltd. Address before: 310030, Zhenhua Road, three pier West Lake Science Park, Hangzhou, Zhejiang, Xihu District 210, China Patentee before: ZHEJIANG XIEPING TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220507 Address after: 510540 room 1608, 16th floor, Baiyun electric science and technology building, No. 9, Keyuan Road, Guangzhou private science and Technology Park, No. 1633, Beitai Road, Baiyun District, Guangzhou, Guangdong Patentee after: Guangzhou Mingde Power Technology Co.,Ltd. Address before: 310030 2 / F, building 2, 210 Zhenhua Road, Xihu District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG GUIRONG XIEPING TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090408 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |