CN112769145A - SVG-capacitor coordination hybrid compensation control system and control method - Google Patents
SVG-capacitor coordination hybrid compensation control system and control method Download PDFInfo
- Publication number
- CN112769145A CN112769145A CN202011629895.7A CN202011629895A CN112769145A CN 112769145 A CN112769145 A CN 112769145A CN 202011629895 A CN202011629895 A CN 202011629895A CN 112769145 A CN112769145 A CN 112769145A
- Authority
- CN
- China
- Prior art keywords
- svg
- capacitor
- compensation
- power supply
- circuit
- 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.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000003068 static effect Effects 0.000 claims abstract description 30
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 4
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a SVG-capacitor coordination hybrid compensation control system and a method, wherein an auxiliary power supply circuit is adopted to independently provide power for a system, the system structure is simplified, reactive compensation is carried out through a static var generator SVG, if the required reactive power is more than or equal to the capacitor input compensation amount, the capacitor is input, then reactive compensation is carried out through the static var generator SVG, and the static var generator SVG is controlled to adjust the compensation capacity according to the compensation feedback result; if required reactive power is less than the capacitor input compensation amount, then directly carry out reactive compensation through SVG, this system is as an organic whole with SVG and capacitor control, and the structure is succinct compact, can carry out independent voltage, current sampling function, and when SVG or arbitrary one device of capacitor take place unusually, still can control another device and continue work, has improved the redundancy performance of device.
Description
Technical Field
The invention belongs to the technical field of new energy and energy conservation, and particularly relates to a SVG-capacitor coordination hybrid compensation control system and method.
Background
The application of a large number of inductive loads in the power grid causes the power factor of the power grid to be reduced, the apparent power of the transformer, the diameter of a power supply line and the like are increased, and the investment of equipment is increased. For a non-speed-regulation large-capacity inductive load, voltage drop can be caused at the moment of starting, and the normal use of other electric equipment is directly influenced. Reactive compensation is the most common solution to this type of power quality problem. With the development of power electronic technology, the existing reactive compensation types are mainly classified into a passive type and an active type.
The passive type adopts passive devices, for example, a capacitor is matched with a corresponding reactance, and once the capacity of the capacitor is fixed, the compensation capacity of the device is also determined; in order to meet the requirement of load change, a thyristor or a contactor and other switches are generally required to be matched, and dynamic compensation is performed by controlling the switching of a capacitor. The passive compensation device cannot realize fine compensation due to the fact that the capacity of the passive compensation device is a fixed value; the control delay is too large due to the fact that the thyristor or the contactor is adopted by the switching switch, and therefore the rapid response cannot be achieved, and the problem of voltage drop cannot be solved. Compared with a passive compensation device, the SVG system is complex and high in cost, and popularization and application of the SVG system are restricted to a certain extent.
Disclosure of Invention
The invention aims to provide a SVG-capacitor coordination hybrid compensation control system and method to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a SVG-capacitor coordination hybrid compensation control system comprises an auxiliary power supply circuit, an analog quantity acquisition circuit, an ARM controller and a communication circuit; the auxiliary power supply circuit is connected with the ARM controller and provides power for the system; the analog quantity acquisition circuit is used for acquiring voltage signals and current signals of a power supply system, sequentially attenuating, isolating, amplifying and limiting the acquired voltage signals and current signals and transmitting the voltage signals and the current signals to the ARM controller, the ARM controller is connected with a Static Var Generator (SVG) and a capacitor through a communication circuit, the ARM controller acquires reactive power required by the power supply system according to the received voltage signals and current signals and performs reactive compensation through the Static Var Generator (SVG), if the required reactive power is more than or equal to the capacitor input compensation quantity, the capacitor is put into the SVG, then the Static Var Generator (SVG) performs reactive compensation, and the Static Var Generator (SVG) is controlled to adjust the supplement capacity according to a compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
Furthermore, the auxiliary power supply circuit adopts a single-ended flyback switching power supply.
Furthermore, a UC2844 chip is adopted as a control chip of the single-ended flyback switching power supply.
Furthermore, the analog quantity acquisition circuit comprises a three-way alternating voltage sampling circuit, a three-way alternating current sampling circuit and a two-way temperature acquisition circuit; the alternating voltage sampling circuit comprises a voltage transformer and a first operational amplifier, the voltage transformer is used for attenuating and isolating the acquired signal, and the isolated voltage signal is subjected to operational amplification and amplitude limiting processing through the first operational amplifier with single-end power supply and then is sent to the ARM controller; the alternating current sampling circuit comprises a current transformer and a second operational amplifier, the current transformer is adopted to perform signal attenuation and isolation on the acquired current signal, and the signal is transmitted to the ARM controller after being subjected to single-end power supply of the second operational amplifier and amplitude limiting processing; the temperature sampling circuit is used for collecting an external NTC resistance signal, and the signal is sent to the ARM controller after being subjected to single-ended power supply by a third operational amplifier and amplitude limiting processing.
Furthermore, the ARM controller is further connected with a digital quantity input and output circuit, the digital quantity input and output circuit comprises two switching value input detection circuits and 6 switching value output circuits, the switching value input detection circuits are isolated through optical couplers, and the switching value output circuits are driven by triodes to serve as relays.
Furthermore, the communication circuit comprises two RS485 communication circuits based on the full-duplex working mode.
Further, the ARM controller adopts STM32F303RCT6TR control chip.
A SVG-capacitor coordinated hybrid compensation control system method comprises the following steps: acquiring a voltage signal and a current signal of a power supply system in real time, sequentially attenuating, isolating, amplifying and limiting the acquired voltage signal and current signal, acquiring reactive power required by the power supply system according to the attenuated, isolated, amplified and limited voltage signal and current signal, performing reactive power compensation through a Static Var Generator (SVG) according to the required reactive power, putting a capacitor into the SVG if the required reactive power is more than or equal to the input compensation amount of the capacitor, performing reactive power compensation through the SVG, and controlling the SVG to adjust the supplementary capacity according to the compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
Compared with the prior art, the invention has the following beneficial technical effects:
the SVG-capacitor coordination hybrid compensation control system adopts the auxiliary power supply circuit to independently supply power to the system, simplifies the system structure, then an analog quantity acquisition circuit is used for acquiring voltage signals and current signals of a power supply system, and the acquired voltage signals and current signals are sequentially subjected to attenuation, isolation, amplification and amplitude limiting treatment, the ARM controller is used for acquiring reactive power required by the power supply system according to the processed voltage signal and current signal, setting a threshold value according to the reactive power, controlling a static var generator SVG and a capacitor connected with the static var generator SVG, carrying out reactive compensation through the static var generator SVG, putting the capacitor into the reactive power compensator if the required reactive power is more than or equal to the input compensation amount of the capacitor, then, performing reactive power compensation through the static var generator SVG, and controlling the static var generator SVG to adjust the supplementary capacity according to the compensation feedback result; if required reactive power is less than the capacitor input compensation amount, then directly carry out reactive compensation through SVG, this system is as an organic whole with SVG and capacitor control, and the structure is succinct compact, can carry out independent voltage, current sampling function, and when SVG or arbitrary one device of capacitor take place unusually, still can control another device and continue work, has improved the redundancy performance of device.
A SVG-capacitor coordination hybrid compensation control system method collects voltage signals and current signals of a power supply system in real time, sequentially attenuates, isolates, amplifies and limits the collected voltage signals and current signals, then obtains reactive power required by the power supply system according to the voltage signals and current signals after attenuation, isolation, amplification and limit processing, and performs reactive power compensation through a Static Var Generator (SVG) according to the required reactive power.
Drawings
Fig. 1 is a schematic diagram of a system structure according to an embodiment of the present invention.
Wherein, 1, auxiliary power supply circuit; 2. an analog quantity acquisition circuit; 3. a digital quantity input-output circuit; 4. an ARM controller; 5. a communication circuit.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, an SVG-capacitor coordinated hybrid compensation control system includes an auxiliary power supply circuit 1, an analog quantity acquisition circuit 2, an ARM controller 4 and a communication circuit 5; the auxiliary power supply circuit is connected with the ARM controller and provides power for the system; the analog quantity acquisition circuit is used for acquiring voltage signals and current signals of a power supply system, sequentially attenuating, isolating, amplifying and limiting the acquired voltage signals and current signals and transmitting the voltage signals and the current signals to the ARM controller, the ARM controller is connected with a Static Var Generator (SVG) and a capacitor through a communication circuit, the ARM controller acquires reactive power required by the power supply system according to the received voltage signals and current signals and performs reactive compensation through the Static Var Generator (SVG), if the required reactive power is more than or equal to the capacitor input compensation quantity, the capacitor is put into the SVG, then the Static Var Generator (SVG) performs reactive compensation, and the Static Var Generator (SVG) is controlled to adjust the supplement capacity according to a compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
The auxiliary power supply circuit 1 adopts a single-ended flyback switching power supply, the power supply input is AC220V, two paths of output direct current power supplies are respectively 24V and 5V, and a control chip of the single-ended flyback switching power supply adopts a UC2844 chip and has an overcurrent protection function; the topology has the advantages of simple structure, small occupied volume, low cost, high reliability and relatively high efficiency.
The analog quantity acquisition circuit 2 comprises a three-way alternating voltage sampling circuit, a three-way alternating current sampling circuit and a two-way temperature acquisition circuit; the alternating voltage sampling circuit comprises a voltage transformer and a first operational amplifier, the voltage transformer is used for attenuating and isolating the acquired signal, the isolated voltage signal is subjected to operational amplification and amplitude limiting processing through the first operational amplifier with single-end power supply and then is sent to the ARM controller, and the output end of the first operational amplifier is connected with an AD input pin of the ARM controller; the alternating current sampling circuit comprises a current transformer and a second operational amplifier, the current transformer is adopted to perform signal attenuation and isolation on the acquired current signal, the signal is transmitted to the ARM controller after being subjected to single-end power supply of the second operational amplifier and amplitude limiting processing, and the output end of the second operational amplifier is connected with an AD input pin of the ARM controller; the temperature sampling circuit is used for collecting an external NTC resistance signal, the signal is sent to the ARM controller after being subjected to single-end power supply of a third operational amplifier and amplitude limiting processing, and the output end of the third operational amplifier is connected with an AD input pin of the ARM controller.
ARM controller 4 still is connected with digital input/output circuit 3, and digital input/output circuit includes two ways switching value input detection circuit and 6 ways switching value output circuit, and switching value input detection circuit adopts the opto-coupler to keep apart, and switching value output circuit adopts triode drive relay, can be used for controlling 6 groups of node type condenser.
The communication circuit 5 comprises two RS485 communication circuits based on a full-duplex working mode, and comprises a transceiver, wherein the transceiver adopts SN65HVD3082EDR, is connected to a communication end of the ARM controller 4 after level conversion, and is specifically connected to USART1 and USART2 of the ARM controller. The corresponding USART1 communication circuit is responsible for communicating with the man-machine interface to complete the functions of uploading data and sending parameters; and a communication circuit corresponding to the USART2 is responsible for controlling the intelligent capacitor with a communication function, and reading and switching control of related variables of the capacitor are completed.
The ARM controller is also connected with a peripheral circuit for ensuring the normal work of the ARM controller, and the peripheral circuit comprises a crystal oscillator, a watchdog and a program programming circuit. The ARM controller adopts an STM32F303RCT6TR control chip, and a mixed compensation software program is contained in the ARM controller, and can realize the control process: the method comprises the steps of obtaining reactive power required by a power supply system according to received voltage signals and current signals, performing reactive power compensation through a Static Var Generator (SVG), inputting a capacitor if the required reactive power is larger than or equal to the input compensation amount of the capacitor, performing reactive power compensation through the SVG, and controlling the SVG to adjust and supplement capacity according to a compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
Through this system real-time detection electric wire netting voltage and electric current, calculate the required reactive power of electric wire netting through fast Fourier operation, can control SVG quick response earlier and compensate idle, then control the input or the excision of corresponding condenser, then adjust compensation capacity through SVG, final most idle is compensated by the condenser, dynamic change or the small part capacity of passing the benefit and oweing the benefit compensate by SVG to realize the perfect seamless reactive compensation under the low cost.
Claims (8)
1. A SVG-capacitor coordination hybrid compensation control system is characterized by comprising an auxiliary power supply circuit (1), an analog quantity acquisition circuit (2), an ARM controller (4) and a communication circuit (5); the auxiliary power supply circuit is connected with the ARM controller and provides power for the system; the analog quantity acquisition circuit is used for acquiring voltage signals and current signals of a power supply system, sequentially attenuating, isolating, amplifying and limiting the acquired voltage signals and current signals and transmitting the voltage signals and the current signals to the ARM controller, the ARM controller is connected with a Static Var Generator (SVG) and a capacitor through a communication circuit, the ARM controller acquires reactive power required by the power supply system according to the received voltage signals and current signals and performs reactive compensation through the Static Var Generator (SVG), if the required reactive power is more than or equal to the capacitor input compensation quantity, the capacitor is put into the SVG, then the Static Var Generator (SVG) performs reactive compensation, and the Static Var Generator (SVG) is controlled to adjust the supplement capacity according to a compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
2. The SVG-capacitor coordinated hybrid compensation control system according to claim 1, characterized in that the auxiliary power supply circuit (1) employs a single-ended flyback switching power supply.
3. The SVG-capacitor coordinated hybrid compensation control system of claim 2, wherein the control chip of the single-ended flyback switching power supply adopts a UC2844 chip.
4. The SVG-capacitor coordinated hybrid compensation control system according to claim 1, wherein the analog quantity collecting circuit (2) comprises a three-way ac voltage sampling circuit, a three-way ac current sampling circuit and a two-way temperature collecting circuit; the alternating voltage sampling circuit comprises a voltage transformer and a first operational amplifier, the voltage transformer is used for attenuating and isolating the acquired signal, and the isolated voltage signal is subjected to operational amplification and amplitude limiting processing through the first operational amplifier with single-end power supply and then is sent to the ARM controller; the alternating current sampling circuit comprises a current transformer and a second operational amplifier, the current transformer is adopted to perform signal attenuation and isolation on the acquired current signal, and the signal is transmitted to the ARM controller after being subjected to single-end power supply of the second operational amplifier and amplitude limiting processing; the temperature sampling circuit is used for collecting an external NTC resistance signal, and the signal is sent to the ARM controller after being subjected to single-ended power supply by a third operational amplifier and amplitude limiting processing.
5. The SVG-capacitor coordinated hybrid compensation control system of claim 1, characterized in that, the ARM controller (4) is further connected with a digital input output circuit (3), the digital input output circuit comprises two switching value input detection circuits and 6 switching value output circuits, the switching value input detection circuits are isolated by optical couplers, and the switching value output circuits are driven by triodes to relay.
6. The SVG-capacitor coordinated hybrid compensation control system according to claim 1, wherein the communication circuit (5) comprises a two-way RS485 communication circuit based on full duplex operation mode.
7. The SVG-capacitor coordinated hybrid compensation control system according to claim 1, wherein the ARM controller controls the chip using STM32F303RCT6 TR.
8. An SVG-capacitor coordinated hybrid compensation control system method based on the SVG-capacitor coordinated hybrid compensation control system of claim 1, comprising the steps of: acquiring a voltage signal and a current signal of a power supply system in real time, sequentially attenuating, isolating, amplifying and limiting the acquired voltage signal and current signal, acquiring reactive power required by the power supply system according to the attenuated, isolated, amplified and limited voltage signal and current signal, performing reactive power compensation through a Static Var Generator (SVG) according to the required reactive power, putting a capacitor into the SVG if the required reactive power is more than or equal to the input compensation amount of the capacitor, performing reactive power compensation through the SVG, and controlling the SVG to adjust the supplementary capacity according to the compensation feedback result; and if the required reactive power is less than the input compensation amount of the capacitor, directly performing reactive compensation through a Static Var Generator (SVG).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011629895.7A CN112769145A (en) | 2020-12-30 | 2020-12-30 | SVG-capacitor coordination hybrid compensation control system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011629895.7A CN112769145A (en) | 2020-12-30 | 2020-12-30 | SVG-capacitor coordination hybrid compensation control system and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112769145A true CN112769145A (en) | 2021-05-07 |
Family
ID=75699327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011629895.7A Pending CN112769145A (en) | 2020-12-30 | 2020-12-30 | SVG-capacitor coordination hybrid compensation control system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112769145A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN204118748U (en) * | 2014-08-20 | 2015-01-21 | 保定市上合电力科技有限公司 | Step-less adjustment low-voltage dynamic filtering compensating apparatus |
| CN104538975A (en) * | 2014-12-26 | 2015-04-22 | 西安爱科赛博电气股份有限公司 | Reactive compensation method and device having transformer reactive current real-time compensation function |
| CN105186531A (en) * | 2015-09-15 | 2015-12-23 | 安徽佑赛科技有限公司 | Hybrid dynamic reactive compensation apparatus and method |
| CN206506299U (en) * | 2017-02-28 | 2017-09-19 | 浙江绿丰电气有限公司 | The centralized Control circuit of SVG and capacitor switching based on MCU |
-
2020
- 2020-12-30 CN CN202011629895.7A patent/CN112769145A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN204118748U (en) * | 2014-08-20 | 2015-01-21 | 保定市上合电力科技有限公司 | Step-less adjustment low-voltage dynamic filtering compensating apparatus |
| CN104538975A (en) * | 2014-12-26 | 2015-04-22 | 西安爱科赛博电气股份有限公司 | Reactive compensation method and device having transformer reactive current real-time compensation function |
| CN105186531A (en) * | 2015-09-15 | 2015-12-23 | 安徽佑赛科技有限公司 | Hybrid dynamic reactive compensation apparatus and method |
| CN206506299U (en) * | 2017-02-28 | 2017-09-19 | 浙江绿丰电气有限公司 | The centralized Control circuit of SVG and capacitor switching based on MCU |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201435610Y (en) | Device for controlling power quality comprehensively | |
| CN105720590B (en) | Power distribution station reactive-load compensation flexible control device and method | |
| CN103124071A (en) | On-line monitoring allowable intelligent high voltage reactive power compensation device | |
| CN102055198B (en) | Reactive compensation intelligent monitoring management system | |
| CN105914760A (en) | Distribution network reactive power compensation control method and device capable of suppressing resonance | |
| CN112769145A (en) | SVG-capacitor coordination hybrid compensation control system and control method | |
| CN210041341U (en) | Automatic three-phase load imbalance adjusting system for low-voltage distribution network | |
| CN202749818U (en) | Controller for thyristor controlled reactor-type static var compensator apparatus | |
| CN105305474B (en) | A kind of network load Fast-Balance regulating system and its control method | |
| CN210041342U (en) | Automatic three-phase load imbalance adjusting system for low-voltage distribution network | |
| CN203850847U (en) | High voltage AC CRH train regenerative braking energy feedback absorption utilizer | |
| CN106356866A (en) | Automatic voltage control substation device of intelligent substation and control method thereof | |
| CN205178522U (en) | Load of power grid is balanced governing system fast | |
| CN201315490Y (en) | 10kV line optimal reactive power compensation control system | |
| CN205983102U (en) | Intelligence is bilateral signal collector regularly | |
| CN204008910U (en) | The band of automatic Regulation loading capacitance-regulating distribution transformer carries detection system | |
| CN210327428U (en) | Efficient control device of diesel generating set | |
| CN205453145U (en) | Power compensatory control system | |
| CN110880770B (en) | Passive and active compensation filtering integrated device | |
| CN204794110U (en) | Reactive power compensator | |
| CN215681822U (en) | Device of factory-level AGC and telemechanical unification | |
| CN204741283U (en) | Reactive power compensator | |
| CN212969065U (en) | Three-phase unbalanced load automatic adjusting device | |
| CN220457129U (en) | Intelligent capacitance control system based on WAPI | |
| CN204375297U (en) | A kind of conversion equipment of simulating generator connecting in parallel with system |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210507 |