CN110048448B - Island detection method based on virtual synchronous generator - Google Patents
Island detection method based on virtual synchronous generator Download PDFInfo
- Publication number
- CN110048448B CN110048448B CN201910194305.3A CN201910194305A CN110048448B CN 110048448 B CN110048448 B CN 110048448B CN 201910194305 A CN201910194305 A CN 201910194305A CN 110048448 B CN110048448 B CN 110048448B
- Authority
- CN
- China
- Prior art keywords
- branch
- detection method
- power
- island
- synchronous generator
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000010355 oscillation Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000013178 mathematical model Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an island detection method based on a virtual synchronous generator, which comprises a logic or relation formed by a branch circuit 1 and a branch circuit 2, wherein the branch circuit 1 judges the offline time of a system by utilizing the sudden change sequence of active power and alternating voltage amplitude at an alternating current bus; the branch 2 monitors the reactive ring oscillation phenomenon at the off-line moment in real time, and the system reliability is enhanced; the passive island detection method provided by the invention can output the island signal only by simple capture, counting and logical operation, has better redundancy, has the detection speed close to the PWM switching frequency, can accurately identify the off-line time in complex working conditions of multiple power grid voltage disturbance, low voltage ride through, inverter output power equal to local load power, load power factor 2.5 and the like, and has better speed and robustness.
Description
Technical Field
The invention belongs to the technical field of distributed generation micro-grids, and particularly relates to an island detection method based on a virtual synchronous generator.
Background
The Virtual Synchronous Generator (VSG) technology references the advantage of a natural and friendly Synchronous Generator (SG) to a power grid, so that the grid-connected inverter has the operation characteristic similar to the SG, the power supply accessed into the power grid and the load tracking capacity of the Synchronous power grid can be helped, the operation and the management of the power grid can be participated autonomously, the corresponding response can be made under the abnormal conditions of the voltage/frequency and the active power/reactive power of the power grid, an operation mechanism similar to the SG is provided, and the stability of a power system is improved while the friendly access of the distributed power supply is realized. However, in practical engineering applications, the distributed microgrid system is usually connected to a power distribution network and the tail end thereof, and is susceptible to various influences of the state of the power distribution network during operation, and particularly in a high-permeability weak power distribution network, the distributed microgrid system is more likely to encounter various working conditions such as grid-connected point voltage drop caused by power grid disturbance or fault, power supply interruption caused by power grid equipment fault and misoperation of workers, power distribution network outage caused by planned maintenance and uncontrollable natural disasters, and the like relatively frequently, so that the VSG algorithm must have the capability of operating under the power grid fault.
When the power grid fails and stops transmitting power to the distribution line, a large number of distributed power systems and local loads are divided into a plurality of isolated islands due to distribution ranges, interconnection relations and the like. The method not only can destroy the original power balance relationship, change the tidal current relationship between each distributed power supply and a large number of local loads, but also can form a plurality of isolated islands, so that the microgrid deviates from the set state to operate, the stability of the system is threatened, and even short-circuit current can be continuously transmitted to a fault point due to the voltage difference between the distributed power supplies and the fault point. Therefore, the grid-tie guidelines also require that islanding be detected within 2s and the circuit breaker at the Point of Common Coupling (PCC) be opened. However, low voltage ride through requires that the system cannot be disconnected within 2s under certain conditions, so that the research on an island detection scheme which operates synchronously with a low voltage ride through algorithm also has important engineering significance.
At present, active and passive island detection methods are usually adopted, but the active detection method is complex in parameter design and easy to reduce the output power quality, and the passive detection method mostly waits for the detection value to exceed the limit, is long in adjustment time and is easy to generate misjudgment. How when grid failure takes place, reliably, detect the islanding phenomenon fast in multiple complicated operating mode, do not take place the erroneous judgement, do not reduce output power quality to be compatible with other control algorithm each other, this needs promptly that technical staff in the art solves corresponding technical problem.
Disclosure of Invention
The invention provides an island detection method based on a VSG algorithm, which aims at the problems that passive island detection is difficult to be compatible with a low-voltage ride-through algorithm, the quality of electric energy is reduced by an active detection method, the adjustment speed of the passive detection method is low, and misjudgment is easy to occur under a complex operation condition.
The technical scheme for solving the technical problems is as follows:
the invention provides an Island detection method based on a VSG algorithm, which is based on the VSG algorithm and is independent of the VSG algorithm, wherein a control structure of the Island detection method mainly comprises a branch 1 and a branch 2, the branch 1 and the branch 2 are in a logic or relation, and an Island signal Island can be output after a triggering link. The branch 1 judges the offline time of the system by utilizing the active power at the AC bus and the abrupt change sequence of the amplitude of the AC voltage; and the branch 2 is used for monitoring reactive ring oscillation at the offline time in real time.
The control structure of the branch 1 is as follows: setting | delta V & lt & gtnon & gt according to relevant power grid standard * Calculating the voltage difference Δ V = | V * -V | and the steady operation signal Stable are multiplied and the pulse is accumulated through a switch function 1 and a counter 1After the pulse is punched, output amplitude limiting is carried out, the upper limit is 1, and the lower line is 0; the active difference value delta P = | P * -P | multiplied Stable is a criterion, if greater than a predetermined value | Δ P- * ＝P * |ΔV| * /V * The counter 1 branch is output, otherwise 0 is output.
Further, the switching function 1 is
Further, the counter 1 is used to accumulate the number of output pulses of the switching function 1.
The control structure of the branch 2 is as follows: calculating the reactive power difference DeltaQ q ＝Q * -D q (V * -V) -Q, multiplied by Stable, passed through a switching function 2 and accumulated with a counter 2; at the current output value K i Last output value K i-1 Set value K C2 And taking the difference as a standard, if the difference is greater than 0, outputting 1, otherwise, outputting 0.
Further, the switching function 2 is
Further, the counter 2 is used to accumulate the number of output pulses of the switching function 2.
Furthermore, the sampling of branch 1 and branch 2 is calculated by a VSG algorithm, and the specific mathematical model of the VSG algorithm is
Wherein D is p Is the active sag factor, omega * At a rated angular velocity, ω m Angular velocity of VSG, J is the active ring inertia coefficient, E m Is the VSG potential.
The invention has the beneficial effects that: different from a passive island detection method which has complex parameter design, needs to be combined with an active island detection method and waits for the set parameter to exceed the limit, all input information of the passive island detection method provided by the invention comes from a VSG algorithm, an island signal can be output only by simple capture, counting and logic operation, the data processing is simple and reliable, and the redundancy is better. In addition, the parameter design of the provided scheme is simple, the detection speed is close to the PWM switching frequency, the offline time can be accurately identified in complex working conditions of multiple power grid voltage disturbance, low voltage ride through, inverter output power equal to local load power, load power factor 2.5 and the like, and the method has better speed and robustness.
Drawings
Fig. 1 is a block diagram of a microgrid basic structure based on a VSG algorithm;
FIG. 2 is a detailed control block diagram of the VSG algorithm of the present invention;
fig. 3 is a block diagram of islanding detection control based on a VSG algorithm according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an islanding detection system based on a VSG algorithm, a main circuit of the system includes: the system comprises a wind turbine, a generator, an uncontrolled rectifier bridge, a filter capacitor, a motor side DC/AC converter, a DC/DC converter, an energy storage device, a direct current bus, a grid side DC/AC converter, an LCL filter, an alternating current bus, PCC, SG, a power grid and a local load. The topological structure is as follows: the wind turbine is electrically connected with the generator, the uncontrolled rectifier bridge, the filter capacitor and the direct current bus in sequence, the motor side DC/AC converter is electrically connected with the generator, the energy storage device is electrically connected with the DC/DC converter, the filter capacitor and the direct current bus, the direct current bus is electrically connected with the filter capacitor, the power grid side DC/AC converter, the LCL filter, the alternating current bus, the PCC, the SG and the power grid, and the alternating current bus is electrically connected with a local load.
The generator side control algorithm in the motor side DC/AC converter and the energy storage device side control module in the DC/DC converter can adopt corresponding algorithms in the existing research results, and the grid-connected inverter side control algorithm in the grid side DC/AC converter adopts a VSG algorithm.
Referring to fig. 2, the control structure of the VSG algorithm is: sampling AC bus voltage v abc And AC bus current i abc Calculating the active power P and the reactive power Q of the fundamental wave, and giving P * And switch SW 4 Active droop coefficient D p Branch, K 1 S and switch SW 1 The sum of the branches is differenced with P and then multiplied by the rated angular velocity omega with the inertia coefficient J of the active ring * Is integrated with the reciprocal of ω * Accessing D after difference calculation p And K 1 The/s branch, on the other hand, being connected to a switch SW 3 Phase angle regulator PI and grid voltage phase angle theta g Summing the difference branch of the AC bus voltage phase angle theta to obtain the VSG angular velocity omega m The VSG phase angle theta is obtained after integration m (ii) a By v abc After the voltage amplitude V is calculated, the voltage amplitude V is compared with the rated voltage amplitude V * Making difference, on one hand multiplying by reactive droop coefficient D q On the other hand with K 2 S and switch SW 2 Branch connection, D q Branch, SW 2 Branch, power given Q * And a switch SW 5 The sum of the branch circuits is subtracted from Q, then the sum of the branch circuits is divided by the inertia coefficient K of the reactive loop, and the integral is obtained to obtain the VSG potential E m (ii) a Will theta m And E m Synthesizing three-phase modulated wave u m . Wherein the switch SW 1 、SW 2 、SW 3 、SW 4 、SW 5 For presynchronization regulation processes for achieving synchronization, wherein SW is used for presynchronization regulation 1 、SW 2 、SW 3 Closed and SW 4 、SW 5 Opening; at the moment when the system is connected to the grid, SW 1 、SW 2 、SW 3 Is turned on and SW 4 、SW 5 And (5) closing.
As can be seen, the mathematical model of the VSG algorithm is
Referring to fig. 3, a control structure of the islanding detection method mainly includes a branch 1 and a branch 2, where the branch 1 and the branch 2 are in a logical or relationship, and an Island signal may be output after a triggering link.
The control structure of the branch 1 is as follows: setting | delta V & lt & gtnon & gt according to relevant power grid standard * Calculating the voltage difference Δ V = | V * After multiplying the V | by a Stable operation signal Stable, performing output amplitude limiting after accumulating pulses through a switching function 1 and a counter 1, wherein the upper limit is 1, and the lower line is 0; the active difference value delta P = | P * -P | multiplied Stable is a criterion, if greater than a predetermined value | Δ P- * ＝P * |ΔV| * /V * The counter 1 branch is output, otherwise 0 is output.
The switching function 1 is
The counter 1 is used for accumulating the number of output pulses of the switching function 1.
The control structure of the branch 2 is as follows: calculating the reactive power difference DeltaQ q ＝Q * -D q (V * -V) -Q, multiplied by Stable, passed through a switching function 2 and accumulated with a counter 2; at the current output value K i Last output value K i-1 A set value K C2 And taking the difference as a standard, if the difference is greater than 0, outputting 1, otherwise, outputting 0.
The switching function 2 is
The counter 2 is used for accumulating the number of output pulses of the switching function 2.
In summary, the island detection method based on the virtual synchronous generator of the present invention includes that two triggering branches, branch 1 and branch 2, form a logical or relationship, where branch 1 determines the system offline time by using the abrupt change sequence of the active power and the ac voltage amplitude at the ac bus; the branch 2 monitors the reactive ring oscillation phenomenon at the off-line moment in real time, and the system reliability is enhanced; the passive island detection method provided by the invention can output the island signal only by simple capture, counting and logical operation, has better redundancy, has the detection speed close to the PWM switching frequency, can accurately identify the off-line time in complex working conditions of multiple power grid voltage disturbance, low voltage ride through, inverter output power equal to local load power, load power factor 2.5 and the like, and has better speed and robustness.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for detecting an Island based on a virtual synchronous generator is characterized by mainly comprising a branch 1 and a branch 2, wherein the branch 1 and the branch 2 are in a logical or relationship and can output an Island signal Island after a triggering link; the branch 1 judges the offline time of the system by utilizing the active power at the AC bus and the abrupt change sequence of the amplitude of the AC voltage; the branch 2 is used for monitoring reactive ring oscillation at the off-line moment in real time;
the control structure of branch 1 is: sampling the voltage amplitude V and the fundamental wave active power P of the alternating current bus, and setting the rated voltage amplitude V * Active power given P * Setting | delta V & lt & gtnon in the air according to related power grid standards * Calculating the voltage difference Δ V = | V * After multiplying V | by a Stable operation signal Stable, accumulating pulses through a switching function 1 and a counter 1, and then carrying out output amplitude limiting, wherein the upper limit is 1, and the lower line is 0; taking the active difference value delta P = | P * -P | multiplied Stable is a criterion, if greater than a predetermined value | Δ P- * ＝P * |ΔV| * /V * Outputting a branch of the counter 1, otherwise outputting 0;
the control structure of the branch 2 is as follows: given Q of sampling power * Reactive droop coefficient D q The fundamental wave reactive power Q, the reactive power difference delta Q is calculated according to the ring inertia coefficient K q ＝Q * -D q (V * -V) -Q, multiplied by Stable, passed through a switching function 2 and accumulated with a counter 2; with the current output value K i Last output value K i-1 A set value K C2 And taking the difference as a standard, if the difference is greater than 0, outputting 1, otherwise, outputting 0.
2. The islanding detection method based on the virtual synchronous generator, as claimed in claim 1, wherein the switching function 1 is:
3. the virtual synchronous generator-based island detection method according to claim 1, wherein the switching function 2 is:
4. the islanding detection method based on the virtual synchronous generator according to claim 1, wherein the sampling of branch 1 and branch 2 is calculated by a VSG algorithm, and the specific mathematical model of the VSG algorithm is
Wherein D is p As the active sag factor, ω * At nominal angular velocity, ω m Angular velocity of VSG, J is the active ring inertia coefficient, E m Is the VSG potential.
5. The virtual synchronous generator-based island detection method according to claim 1, wherein a counter 1 is used for accumulating the number of output pulses of a switching function 1.
6. The virtual synchronous generator-based islanding detection method according to claim 1, wherein the counter 2 is used for accumulating the number of output pulses of the switching function 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910194305.3A CN110048448B (en) | 2019-03-14 | 2019-03-14 | Island detection method based on virtual synchronous generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910194305.3A CN110048448B (en) | 2019-03-14 | 2019-03-14 | Island detection method based on virtual synchronous generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110048448A CN110048448A (en) | 2019-07-23 |
| CN110048448B true CN110048448B (en) | 2022-12-16 |
Family
ID=67274797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910194305.3A Active CN110048448B (en) | 2019-03-14 | 2019-03-14 | Island detection method based on virtual synchronous generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110048448B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856311B (en) * | 2020-07-06 | 2021-08-03 | 上海交通大学 | Island detection method and system for distributed power supply of medium and low voltage direct current system |
| CN112104004B (en) * | 2020-09-08 | 2022-02-18 | 南通大学 | Voltage signal synchronous detection method for new energy power generation grid-connected control |
| CN114243761A (en) * | 2021-11-25 | 2022-03-25 | 国网山东省电力公司烟台供电公司 | Control method and system for switching on-grid operation mode and off-grid operation mode of micro-grid vehicle |
| CN114696347B (en) * | 2022-05-31 | 2022-08-26 | 新风光电子科技股份有限公司 | Active island judgment system and method for energy storage system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767219A (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | Household grid-connected inverter control strategy based on virtual synchronous generator |
| CN106816888A (en) * | 2017-03-02 | 2017-06-09 | 江苏大学 | Island detection method, system and microgrid control system based on virtual synchronous generator |
-
2019
- 2019-03-14 CN CN201910194305.3A patent/CN110048448B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767219A (en) * | 2015-03-27 | 2015-07-08 | 国家电网公司 | Household grid-connected inverter control strategy based on virtual synchronous generator |
| CN106816888A (en) * | 2017-03-02 | 2017-06-09 | 江苏大学 | Island detection method, system and microgrid control system based on virtual synchronous generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110048448A (en) | 2019-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110048448B (en) | Island detection method based on virtual synchronous generator | |
| Patnaik et al. | AC microgrid protection–A review: Current and future prospective | |
| Blaabjerg et al. | Distributed power-generation systems and protection | |
| Telukunta et al. | Protection challenges under bulk penetration of renewable energy resources in power systems: A review | |
| Alegria et al. | CERTS microgrid demonstration with large-scale energy storage and renewable generation | |
| Nzimako et al. | Real time simulation of a microgrid with multiple distributed energy resources | |
| CN102904274A (en) | Power plant control system and method for influencing high voltage characteristics | |
| CN111600334B (en) | Alternating current fault diagnosis and ride-through control method for four-terminal wind power direct current power grid | |
| Guha et al. | Anti-islanding techniques for Inverter-based Distributed Generation systems-A survey | |
| Hatata et al. | A review of anti-islanding protection methods for renewable distributed generation systems | |
| Ghardashi et al. | Accuracy and speed improvement of microgrid islanding detection based on PV using frequency-reactive power feedback method | |
| Shanmugapriya et al. | Recent developments in AC and DC microgrids: systematic evaluation of protection schemes | |
| Mogaka et al. | Islanded and grid-connected control in a microgrid with wind-PV hybrid | |
| CN110967576A (en) | Anti-islanding operation detection method under distributed power supply grid-connected mode | |
| Ghadimi et al. | MLP based islanding detection using histogram analysis for wind turbine distributed generation | |
| Ortmann et al. | Architecture, components and operation of an experimental hybrid ac/dc smart microgrid | |
| Mihalache et al. | Modeling of a small distribution grid with intermittent energy resources using MATLAB/SIMULINK | |
| CN111856311B (en) | Island detection method and system for distributed power supply of medium and low voltage direct current system | |
| Hashemi et al. | Assessment of an adaptive neuro fuzzy inference system for islanding detection in distributed generation | |
| Invernizzi et al. | Challenges in microgrid control systems design. An application case | |
| Srivastava et al. | Real time modeling and control of smart grid systems | |
| Yan et al. | Islanding of distribution networks: challenges and potential solutions | |
| Reddy et al. | Islanding Detection of Integrated Wind Energy System with Variations in DC Link Voltage | |
| CN111817356B (en) | Roof photovoltaic grid-connected device and microgrid island detection method | |
| Salem et al. | Operation mode transition of a low-voltage single phase microgrid based on synchronization controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231013 Address after: 223005 Qingchuang Space 16F-03, Huai'an Ecological and Cultural Tourism Zone, Huai'an City, Jiangsu Province Patentee after: Huai'an Xinye Power Construction Co.,Ltd. Address before: Room 1107, Building B3, Financial Center, No. 16 Shuidukou Avenue, Qingjiangpu District, Huai'an City, Jiangsu Province, 223001 Patentee before: Jiangsu Kewen Enterprise Management Co.,Ltd. Effective date of registration: 20231013 Address after: Room 1107, Building B3, Financial Center, No. 16 Shuidukou Avenue, Qingjiangpu District, Huai'an City, Jiangsu Province, 223001 Patentee after: Jiangsu Kewen Enterprise Management Co.,Ltd. Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University |
|
| TR01 | Transfer of patent right |