CN211319217U - Layered simulation test system for converter station - Google Patents
Layered simulation test system for converter station Download PDFInfo
- Publication number
- CN211319217U CN211319217U CN201922182817.6U CN201922182817U CN211319217U CN 211319217 U CN211319217 U CN 211319217U CN 201922182817 U CN201922182817 U CN 201922182817U CN 211319217 U CN211319217 U CN 211319217U
- Authority
- CN
- China
- Prior art keywords
- simulation
- equipment
- protocol conversion
- small
- size
- 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
- 238000004088 simulation Methods 0.000 title claims abstract description 159
- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000012821 model calculation Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model provides a current conversion station layering emulation test system, including big step size simulation equipment, little step size simulation equipment, simulation server. The small-step simulation equipment is arranged on an engineering site, is used for simulating a direct current device or a system to be simulated, and is connected with engineering equipment needing to participate in simulation; the large-step simulation equipment is arranged in a simulation center and used for simulating an alternating current system to be simulated; the simulation server is arranged in the simulation center and used for modeling, signal processing and waveform display, wherein in order to ensure real-time performance, the simulation is realized by using the small-step simulation equipment arranged on the engineering site to the direct current equipment or the system which has higher change speed and higher requirement on communication and needs to be connected with the engineering equipment, and the simulation is realized by using the large-step simulation equipment arranged on the simulation center to the alternating current equipment which has lower change speed and lower requirement on communication without transporting the engineering equipment on the engineering site to the simulation center for a long distance.
Description
Technical Field
The utility model relates to a transmission of electricity field especially relates to a current conversion station layering emulation test system.
Background
The flexible direct current transmission technology is a novel transmission technology based on a voltage source converter, a self-turn-off device and a Pulse Width Modulation (PWM) technology, and has the advantages of capability of supplying power to a passive network, no phase change failure, no need of communication between converter stations, easiness in forming a multi-terminal direct current system and the like. Compared with the traditional thyristor-based current source type direct current transmission technology, the flexible direct current transmission technology has high controllability, convenient and environment-friendly design and construction, small occupied area and no communication between converter stations, and has obvious advantages in the aspects of renewable energy grid connection, distributed power generation grid connection, island power supply, urban power grid power supply and the like. Flexible dc transmission has developed rapidly in recent years.
The half-bridge MMC type converter is one of main components in flexible direct current transmission, the main structure of the converter is shown in figure 1, the converter is composed of three phase units, each phase unit comprises an upper bridge arm and a lower bridge arm, and a bridge arm branch is formed by connecting a plurality of MMC sub-modules in series. Each MMC type submodule consists of elements such as an IGBT, a capacitor, a diode and a thyristor, and the switching on and off of the capacitor is controlled through the switching on and off of the IGBT. And controlling the voltage of the whole branch by controlling the input quantity and voltage of MMC sub-modules in the phase unit.
The control protection strategy and effect of the flexible direct current transmission can only be tested and verified through simulation, if pure digital simulation is carried out, a plurality of engineering conditions and strategies can only be simplified or equivalent, and the effect deviation from the actual engineering effect is large. In order to ensure the test effect, mixed material simulation is needed.
When mixed material simulation is adopted, if test equipment is moved to an engineering site, the test equipment is difficult to realize due to the fact that the test equipment is large in quantity, large in size and high in cost, is easy to damage during transportation and has high requirements on a power supply of the engineering site, and joint debugging tests of a control protection system are generally carried out in a laboratory before engineering operation or during system upgrading.
The existing testing method is to set up a set of simulation environment and testing system consistent with the field situation in a laboratory; the equipment of the engineering site is required to be transported to the laboratory engineering equipment to occupy a large amount of experimental sites when the experimental environment is built, a large amount of manpower, material resources and time are consumed, and the workload is large and tedious. The transportation of the engineering equipment to the laboratory will lead to the stoppage or delay of the operation of the engineering equipment, resulting in economic loss.
The existing method is to transport a large amount of equipment on the engineering site to a laboratory and build a simulation test system
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides a current conversion station layering emulation test system can solve the problem that exists among the prior art at least partially.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, a layered simulation test system for a converter station is provided, which includes: the system comprises large-step-size simulation equipment, small-step-size simulation equipment and a simulation server;
the large-step-size simulation equipment is in communication connection with the small-step-size simulation equipment and the simulation server;
the small-step simulation equipment is arranged on an engineering site, is used for simulating a direct current device or a system to be simulated, and is connected with engineering equipment needing to participate in simulation;
the large-step simulation equipment is arranged in a simulation center and used for simulating an alternating current system to be simulated;
the simulation server is arranged in the simulation center and used for modeling, signal processing and waveform display.
Further, the small-step simulation equipment is a mobile simulator.
Further, the mobile simulator includes: an MMC computing device and an interface device connected with the MMC computing device;
the MMC computing device is used for computing an MMC valve model, and the interface device is used for receiving the collected analog quantity and digital quantity.
Further, the small-step simulation equipment is generally connected with a flexible-direct control protection system through a valve control device, and is connected with other field equipment according to experimental needs.
Further, the large-step simulation equipment is a real-time digital simulator and is used for model calculation, upper computer communication and signal synchronization.
Further, the layered simulation test system for the converter station further comprises: the first protocol conversion equipment and the second protocol conversion equipment;
the first protocol conversion equipment is arranged in the simulation center, is connected with the large-step-size simulation equipment, is used for receiving the small-step-size simulation result and carrying out protocol conversion, and is used for carrying out protocol conversion on the large-step-size simulation result and then sending the large-step-size simulation result to an engineering field;
the second protocol conversion equipment is arranged on the engineering site, connected with the small-step-size simulation equipment, used for receiving the large-step-size simulation result and carrying out protocol conversion, and used for carrying out protocol conversion on the small-step-size simulation result and then sending the small-step-size simulation result to the simulation center.
Further, the first protocol conversion device is in communication connection with the second protocol conversion device through a 5G mobile network.
Further, the first protocol conversion device and the second protocol conversion device are connected through optical fiber communication.
The utility model provides a current conversion station layering emulation test system, include: the system comprises large-step-size simulation equipment, small-step-size simulation equipment and a simulation server; the large-step simulation device is in communication connection with the small-step simulation and the simulation server. The small-step simulation equipment is arranged on an engineering site, is used for simulating a direct current device or a system to be simulated, and is connected with engineering equipment needing to participate in simulation; the large-step simulation equipment is arranged in a simulation center and used for simulating an alternating current system to be simulated; the simulation server is arranged in the simulation center and used for modeling, signal processing and waveform display, wherein, in order to ensure real-time performance, the simulation is realized by using the small-step-size simulation equipment arranged in the engineering site to realize the simulation of the direct current equipment or system which has higher change speed and higher requirement on communication and needs to be connected with the engineering equipment, and the simulation is realized by using the large-step-size simulation equipment arranged in the simulation center to realize the simulation of the alternating current equipment which has lower change speed and lower requirement on communication, because the small-step-size simulation equipment has small volume and small board card and can work by using commercial power, the small-step-size simulation equipment can be arranged in the engineering site, the engineering equipment in the engineering site does not need to be transported to the simulation center for a long distance, the large-step-size simulation equipment with high cost and high requirement on power supply is arranged in the simulation center, and the test equipment does not need to, the control protection strategy test and simulation for the flexible direct current transmission are realized, the workload is reduced on the basis of ensuring the simulation effect, and the control protection strategy test and simulation method is simple and convenient.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
fig. 1 is a structural diagram of a half-bridge type MMC current converter in a conventional flexible dc power transmission system;
fig. 2 shows an architecture diagram of a layered simulation test system of a converter station according to an embodiment of the present invention;
fig. 3 shows a simulation model of a large-step simulation apparatus in an embodiment of the present invention;
fig. 4 shows a simulation model of a small step size simulation apparatus in an embodiment of the present invention;
fig. 5 is a diagram illustrating an architecture of another layered simulation test system for a converter station according to an embodiment of the present invention;
fig. 6 shows a system overall network architecture according to an embodiment of the present invention;
fig. 7 shows the working principle of the mobile emulator in the embodiment of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art according to the disclosure of the present specification, the claims and the drawings. The following examples further illustrate the aspects of the present invention in detail, but do not limit the scope of the present invention in any way.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The existing scheme for carrying out simulation test on the converter station by adopting a laboratory joint debugging test scheme simplifies or is equivalent to a plurality of field environments, and has larger effect deviation with the actual engineering. Therefore, the existing testing method is to set up a set of simulation environment and testing system consistent with the field situation in a laboratory; the equipment on the engineering site needs to be transported to a laboratory for building a test environment, or a set of control protection device which is the same as the engineering site needs to be reconfigured in the laboratory, so that the workload is large and tedious.
In order to solve at least part of the technical problems in the prior art, the embodiment of the utility model provides a layered simulation test system for a converter station, which realizes simulation by using a small-step simulation device arranged on an engineering site through a direct current device or a system which has a high change speed and a high requirement on communication and needs to be connected with an engineering device, and realizes simulation by using a large-step simulation device arranged on a simulation center without transporting the engineering device on the engineering site to the simulation center, and sets a large-step simulation device which has a large volume, a high cost and a high requirement on a power supply in the simulation center, so that the test and simulation of a control protection strategy for flexible direct current transmission can be realized on the basis of not moving the test device to the engineering site, and on the basis of ensuring the simulation effect, the workload is reduced, and the method is simple and convenient.
Fig. 2 shows an architecture diagram of a layered simulation test system of a converter station according to an embodiment of the present invention; as shown in fig. 2, the layered simulation test system for a converter station includes: a large step size simulation device 2, a small step size simulation device 5 and a simulation server 1;
the large-step simulation equipment 2 is in communication connection with the small-step simulation equipment 5 and the simulation server 1;
the small-step simulation equipment 5 is arranged on an engineering site, is used for simulating a direct current device or system to be simulated, and is connected with engineering equipment needing to participate in simulation;
the large-step simulation equipment 2 is arranged in a simulation center and used for simulating an alternating current system to be simulated;
the simulation server 1 is arranged in the simulation center and used for modeling, signal processing and waveform display.
The layered real-time digital simulation test of the converter station is realized by combining a field and a laboratory.
It is worth to be noted that the large-step simulation equipment is mainly used for simulating alternating current power grid equipment with a slow electric quantity change rate, and a simulation model of the large-step simulation equipment is shown in fig. 3; the small-step simulation equipment is mainly used for simulating equipment with rapid state and electric quantity change, such as power electronic equipment, and the like, and a simulation model of the small-step simulation equipment is shown in figure 4, for a power grid containing a converter station, small-step simulation is used for a converter and alternating current equipment connected with the converter, large-step simulation is used for other alternating current power grid equipment, and part of data and signals can directly acquire real data of an engineering field; the data interaction between the large-step-size simulation equipment and the small-step-size simulation equipment can be carried out through a rapid data transmission network. Namely: and the small-step simulation of the part needing to be connected with the engineering equipment is carried out on the engineering site. If data interaction with engineering equipment is not needed, the part of simulation content is developed in a simulation center.
To sum up, the utility model discloses a with big step size simulation equipment and little step size simulation equipment result to the characteristics to different signals, be used for developing the field test with portable little step size simulator, utilize big step size simulator to rely on data transmission network to acquire field data in the laboratory and realize the emulation, need not remove the equipment at the engineering scene to the emulation center, on the basis that need not remove test equipment to the engineering scene, realize test and emulation to flexible direct current transmission's control protection strategy, on the basis of guaranteeing the simulation effect, the work load has been reduced, and is simple and convenient.
In an alternative embodiment, the small-step simulation device is a mobile simulator.
Specifically, the mobile simulator may include: an MMC computing device and an interface device connected with the MMC computing device;
wherein the MMC computing means are adapted for computing the MMC valve model, and the interface means are adapted for receiving the acquired analog and digital quantities.
By adopting the small-step simulation equipment with the structure, high-precision small-step simulation can be realized, and the simulation effect is further optimized.
In an alternative embodiment, continuing with fig. 2, the small-step simulation plant 5 is generally connected to a flexible control protection system 7 via a valve control device 6 and to other field devices 8 as required by the experiment.
In an alternative embodiment, the large-step simulation device is a real-time digital simulator for performing model calculation, upper computer communication and signal synchronization.
In an alternative embodiment, referring to fig. 5, the layered simulation test system for a converter station may further include: a protocol conversion device 3 and a protocol conversion device 4.
The protocol conversion equipment 3 is arranged in the simulation center, connected with the large-step simulation equipment 2, and used for receiving the small-step simulation result, performing protocol conversion, and transmitting the large-step simulation result to an engineering field after performing protocol conversion;
and the protocol conversion equipment 4 is arranged on the engineering site and connected with the small-step-size simulation equipment 5 and used for receiving the large-step-size simulation result and carrying out protocol conversion on the large-step-size simulation result and sending the small-step-size simulation result to the simulation center after protocol conversion.
The protocol conversion equipment is arranged to receive and transmit data and convert protocols, so that the communication flexibility between the large-step-size simulation equipment and the small-step-size simulation equipment is improved.
In an alternative embodiment, the protocol conversion device 3 and the protocol conversion device 4 can be connected through a 5G mobile network communication.
With the rapid development of 5G, even 6G and other communication technologies, the data volume which can be transmitted in unit time is large and stable, the transmission rate can reach 100Mb or even faster, the data transmission by using a 5G mobile network improves the real-time property of the large-step simulation equipment for acquiring data, and further optimizes the simulation effect.
In another alternative embodiment, the protocol conversion device 3 and the protocol conversion device 4 may be connected through cables, optical fibers, or the like, so as to enable fast data transmission.
It is worth explaining, the embodiment of the utility model provides a hierarchical simulation test system of converter station can set up many mobile simulators at a plurality of scene, see fig. 6, realize the networking to a plurality of scenes, many mobile simulators and central simulation system, the networking each other can use electric power private network or 5G communication network; if a 5G communication network is used for transmitting data, a 5G sending module needs to be added to the protocol conversion device. The interface device is arranged at the position close to the control protection equipment needing to be connected, and the mobile simulator is suitable to be connected with the interface device by using optical fibers on the site.
In addition, the embodiment of the utility model provides a hierarchical simulation test system of converter station can partly gather the true data and the state of primary equipment, see fig. 7, can be more reflect field device's characteristic, action time etc. especially have the condition of some characteristics novel equipment not yet clear at the simulation or the scene of recurrence accident scene. For example, the direct current breaker is added into links of a mobile simulator, direct current valve control, direct current control and direct current protection to carry out integral closed loop test. Therefore, after the power grid fault is simulated, the action time of the protection device and the overall direct current circuit breaker can be actually acquired, wherein the action time comprises the actual input time, the input state, the exit time, the exit state and the like of each branch (a through-current branch, a transfer branch and the like) of the direct current circuit breaker in the breaking process. In the test process, the state monitoring and the response monitoring of the equipment can be added according to the test requirements.
The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make modifications or changes equivalent to the above disclosed technical content without departing from the scope of the present invention, but all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. A layered simulation test system for a converter station is characterized by comprising: the system comprises large-step-size simulation equipment, small-step-size simulation equipment and a simulation server;
the large-step simulation equipment is in communication connection with the small-step simulation equipment and the simulation server;
the small-step simulation equipment is arranged on an engineering site, is used for simulating the direct current equipment or system to be simulated, and is connected with engineering equipment needing to participate in simulation;
the large-step simulation equipment is arranged in a simulation center and used for simulating an alternating current system to be simulated;
the simulation server is arranged in the simulation center and used for modeling, signal processing and waveform display.
2. The layered simulation test system for a converter station according to claim 1, wherein the small-step simulation equipment is a mobile simulator.
3. The layered simulation test system for a converter station of claim 2, wherein the mobile simulator comprises: an MMC computing device and an interface device connected with the MMC computing device;
the MMC computing device is used for computing an MMC valve model, and the interface device is used for receiving the collected analog quantity and digital quantity.
4. The layered simulation test system for the converter station according to claim 1, wherein the small-step simulation equipment is generally connected with a flexible-direct control protection system through a valve control equipment, and is connected with other field equipment according to experimental needs.
5. The layered simulation test system for a converter station according to claim 1, wherein the large-step simulation equipment is a real-time digital simulator for performing model calculation, upper computer communication and signal synchronization.
6. The layered simulation test system for a converter station according to claim 1, further comprising: the first protocol conversion equipment and the second protocol conversion equipment;
the first protocol conversion equipment is arranged in the simulation center, is connected with the large-step-size simulation equipment, is used for receiving the small-step-size simulation result and carrying out protocol conversion, and is used for carrying out protocol conversion on the large-step-size simulation result and then sending the large-step-size simulation result to an engineering field;
the second protocol conversion equipment is arranged on the engineering site and connected with the small-step-size simulation equipment and used for receiving the large-step-size simulation result and carrying out protocol conversion on the large-step-size simulation result and sending the small-step-size simulation result to the simulation center after protocol conversion.
7. The layered simulation test system for converter stations according to claim 6, wherein said first protocol conversion device and said second protocol conversion device are communicatively connected via a 5G mobile network.
8. The layered simulation test system for converter stations according to claim 6, wherein said first protocol conversion device and said second protocol conversion device are connected by fiber-optic communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922182817.6U CN211319217U (en) | 2019-12-06 | 2019-12-06 | Layered simulation test system for converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922182817.6U CN211319217U (en) | 2019-12-06 | 2019-12-06 | Layered simulation test system for converter station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211319217U true CN211319217U (en) | 2020-08-21 |
Family
ID=72058863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922182817.6U Active CN211319217U (en) | 2019-12-06 | 2019-12-06 | Layered simulation test system for converter station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211319217U (en) |
-
2019
- 2019-12-06 CN CN201922182817.6U patent/CN211319217U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104091482B (en) | Operation and maintenance simulating training system of smart distribution grid | |
| CN103680238B (en) | A kind of intelligent substation Hybrid Simulation Training System for Industry | |
| CN104423373A (en) | Closed-loop test system of flexible direct current transmission system control and protection system | |
| CN103675534B (en) | The method of test flexible direct-current transmission valve control equipment | |
| CN103792854B (en) | Flexible DC power transmission semi-matter simulating system based on modularization multi-level converter | |
| CN103439967A (en) | Closed loop test system of flexible direct current transmission control protection system | |
| CN104820373A (en) | Simulation experiment platform and method for modularized multilevel converter | |
| CN103235223B (en) | A kind of micro-capacitance sensor experimental test platform based on RTDS | |
| CN104076693A (en) | Flexible direct-current transmission real-time simulation system and simulation method thereof | |
| CN104570768A (en) | Information physics semi-physical simulation system based on Rt-Lab and OPNET | |
| CN104749466A (en) | Intelligent transformer station relay protection testing system and method and realization method | |
| CN104199311A (en) | Simulation test system of multi-terminal flexible direct current transmission control protection system | |
| CN109066754A (en) | DC distribution net real-time emulation system and method | |
| CN110286606A (en) | Comprehensive energy microgrid control experiment system based on semi-physical simulation | |
| CN104914734A (en) | Mixed DC closed-loop test system and implementation method | |
| CN104950694A (en) | RTDS and RT-LAB combined MMC (modular multilevel converter) simulation system | |
| CN208432876U (en) | DC distribution net real-time emulation system | |
| CN106934105B (en) | Stable control closed loop simulation system based on RTDS | |
| CN107102567A (en) | A kind of emulation test system and method for testing | |
| CN110851998A (en) | Layered simulation test system for converter station | |
| CN204424920U (en) | Based on mixed DC system topology and the real-time simulation device thereof of LCC and MMC parallel connection | |
| CN211319217U (en) | Layered simulation test system for converter station | |
| CN210895044U (en) | Real-time simulation system capable of flexibly accessing MMC valve control pulse distribution screen | |
| CN211403679U (en) | Three-phase user simulation device for electricity consumption information acquisition low-voltage distribution room | |
| CN104375422A (en) | Emulation system based on STATCOM controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |