CN105281367A - Multi-parallel grid-connected and off-grid seamless switching system and method thereof - Google Patents
Multi-parallel grid-connected and off-grid seamless switching system and method thereof Download PDFInfo
- Publication number
- CN105281367A CN105281367A CN201510755946.3A CN201510755946A CN105281367A CN 105281367 A CN105281367 A CN 105281367A CN 201510755946 A CN201510755946 A CN 201510755946A CN 105281367 A CN105281367 A CN 105281367A
- Authority
- CN
- China
- Prior art keywords
- grid
- net
- micro
- capacitance sensor
- mgcc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a multi-parallel grid-connected and off-grid seamless switching system and a method thereof. The method comprises the following steps that: (1), a bottom device carries out operation in a grid-connected mode; (2), an MGCC issues an off-grid pre-fabricated broadcast command; (3), a bottom host receives the off-grid pre-fabricated command; (4), when the bottom host detects a zero crossing point, synchronous signals are sent to all bottom slave devices; (5), the slave devices detect the synchronous signals and off-grid operation is started; (6), the MGCC issues an off-grid synchronous instruction and issues voltage amplitude and frequency information of a system side of a PCC point by a GOOSE network; and (7), the MGCC determines an off-grid synchronous instruction meets a requirement, grid connection switching instrument broadcast command is issued, and all bottom devices receive the instruction and then grid connection switching is carried out for operation, so that the whole switching flow is completed. Compared with the prior art, the provided system and method have advantages of seamless and synchronous switching and the like.
Description
Technical field
The present invention relates to field of power, especially relate to a kind of multi-machine parallel connection and from net seamless switch-over system and method thereof.
Background technology
At present, at micro-capacitance sensor, electric automobile fills electrical changing station, in extensive energy-accumulating power station application, for guarantee and from net handover success, the hard node signal of general employing two 4 kinds of compound modes realize, because centre exists device locking pwm pulse, switching in waiting process the process that there will be low latency PCC point and disconnect or close, so seamless switching truly cannot be realized, the power failure phenomenon in short-term of important load can be caused, important load is caused normally to work, if there is diesel engine generator in system, diesel engine generator short-time overload can be caused, have a strong impact on the useful life that bavin is sent out, secondly, when the parallel running of multimachine equipment, generally adopt one other employings are incorporated into the power networks from network operation, when load is greater than unitary device capacity, now and device can be caused to transship from net switching, handoff failure.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of multi-machine parallel connection and from net seamless switch-over system and method thereof.
Object of the present invention can be achieved through the following technical solutions:
A kind of multi-machine parallel connection and from net seamless switch-over system, comprise underlying device, spacing devices and station monitoring and control equipment, described underlying device comprises PCS control cubicle, wind-driven generator, photovoltaic generator, mode switching controller and load governor, described spacing devices is MGCC micro-capacitance sensor Centralized Controller, described PCS control cubicle, wind-driven generator, photovoltaic generator, mode switching controller intercoms respectively by CAN network mutually with load governor, and communicate with MGCC micro-capacitance sensor Centralized Controller respectively by GOOSE network, described MGCC micro-capacitance sensor Centralized Controller is communicated with station monitoring and control equipment by GOOSE network.
Described station monitoring and control equipment comprises monitoring PC, data server, printer and GPS correction device, and described monitoring PC is connected with MGCC micro-capacitance sensor Centralized Controller, data server, printer and GPS correction device respectively.
Described GOOSE network is real-time ethernet.
Described CAN network adopts synchronous optical fiber to carry out information interaction, in order to Phase synchronization.
Multi-machine parallel connection and from a net seamless handover method, the method comprises also-switch submethod and from-grid-connected switching submethod from net.
Described also-switch submethod from net to comprise the following steps:
11) switch-closed time at the micro-capacitance sensor PCC point place of multi-machine parallel connection is obtained;
12) what MGCC micro-capacitance sensor Centralized Controller sent at reception station monitoring and control equipment issues from the prefabricated broadcasting command of net by GOOSE network after net instruction;
13) PCS control cubicle receives from the prefabricated broadcasting command of net, and makes to receive from the time spent by the prefabricated broadcasting command of net equal with the switch-closed time at micro-capacitance sensor PCC point place;
14) PCS control cubicle sends synchronizing signal to each underlying device by CAN network;
15) underlying device detects synchronizing signal and starts to leave network operation.
Described to comprise the following steps from-grid-connected switching submethod:
21) switch off-time at the micro-capacitance sensor PCC point place of multi-machine parallel connection is obtained;
22) MGCC micro-capacitance sensor Centralized Controller after receiving the grid-connected instruction that sends of station monitoring and control equipment by off the net of GOOSE from the voltage magnitude of the net instruction same period, PCC dot system side and frequency information to PCS control cubicle;
23) after PCS control cubicle receives instruction, adjustment synchronizing signal, the voltage magnitude of underlying device from motion tracking PCC dot system side and frequency information;
24) when from net the instruction same period meet require from net time, MGCC micro-capacitance sensor Centralized Controller issues and turns grid-connected command broadcast order, the time that PCS control cubicle is received spent by grid-connected command broadcast order is equal with the switch off-time at micro-capacitance sensor PCC point place, turns and be incorporated into the power networks after each equipment of bottom receives instruction.
Compared with prior art, the present invention has the following advantages:
One, seamless and switch from net, the present invention receives equal with the switch opening/closing time at micro-capacitance sensor PCC point place from the time of grid-connected broadcasting instructions by controls PCS control cubicle, realize multi-machine parallel connection and from netting switching.
Two, synchronism switching: the present invention adopts GOOSE network and high-speed CAN network service, wherein GOOSE network is 100,000,000 bandwidth Ethernets, high-speed CAN network adopts synchronous optical fiber to communicate between underlying device, the switch motion time at micro-capacitance sensor PCC point place is about 1us, ensure that the real-time transmitted in information.
Accompanying drawing explanation
Fig. 1 is multi-machine parallel connection synchronous interaction schematic diagram in embodiment.
Fig. 2 is embodiment multi-machine parallel connection sharing control block diagram.
Fig. 3 is embodiment multimachine and from net switch logic figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
As shown in Figure 1, figure is multi-machine parallel connection synchronous interaction schematic diagram, whole multi-machine parallel connection and be divided into three-layer network framework from net seamless switch-over system, underlying device comprises: PCS rack and battery, wind-driven generator, photovoltaic generator, power load, protected location, MC, LC (wherein MC mode switching controller and LC load governor can be put into wall MGCC to realize), spacing devices is MGCC micro-capacitance sensor Centralized Controller mainly, spacing devices and underlying device adopt double-network communication, the remote measurement of first network prevailing transmission PCS and remote signalling, the data of the non real-time nature such as BMS information, this kind of data demand response time is slow, communication protocol is IEC61850, the remote control of second network prevailing transmission, the amount in real time such as the part remote signalling of remote regulating and some participation Systematical control and telemetry intelligence (TELINT), owing to requiring that the response time is than very fast, this partial information is less, adopt GOOSE agreement.MGCC micro-capacitance sensor Centralized Controller receives station monitoring and control equipment and issues switching command, is issued to each underlying device, carries out the execution switched after each underlying device receives instruction by GOOSE broadcasting command.
PCS rack is connected with each underlying device by CAN, transmit real-time meritorious, reactive power and now the machine parallel operation preparation instruction, when arbitrary controller receives power information, according to PCS number effective in now bus, be averaged power calculation, and what simultaneously PCS rack received that overlayer monitors issues opens, stop, reset instruction carries out relevant control to from machine.The fault message of the machine is sent out from PCS rack, when a certain underlying device is in fault, above send malfunction to other devices, PCS rack parallel operation preparation instruction is set to disarmed state simultaneously, other devices according to the number of warning order, the calculating of the power that is averaged.Synchronizing signal produces: synchronizing signal interrupts counting by PCS rack according to control to produce, it is consistent that PCS rack and other underlying device receive synchronizing signal, when underlying device receives synchronizing signal, bottom controller judges synchronizing signal hopping edge, bottom controller is triggered by hardware interrupts, bottom controller receives after hardware interrupts, and it is phase-locked to carry out off-grid zero passage, completes synchronizing process.
In Fig. 2, Pi is system active power, and Qi is system reactive power, and Pave is computing system active power set-point, Qave is the idle set-point of computing system, when impedance is pure perception, inverter output voltage d axle component difference causes idle unbalanced, and q axle difference causes meritorious output circulation.In order to realize the equilibrium of inverter output power, the outer PI adding power equalization can be controlled at contravarianter voltage and controlling, to suppress the circulation between inverter.Owing to needing detection system to export meritorious and reactive power, therefore add the time delay of a 20ms, its governing speed is comparatively slow, but current-sharing effect is better, and stability is high, has stronger disturbance rejection.
As shown in Figure 3, in figure, the grid-connected net logic flow that leaves is: underlying device is incorporated into the power networks, MGCC issues from the prefabricated broadcasting command of net, bottom main frame receives and judge synchronizing signal zero crossing after the prefabricated order of net, network operation is left when zero crossing being detected, send out synchronizing signal to each bottom slave devices simultaneously, when slave devices detects synchronizing signal hopping edge, leave network operation.Turning grid-connected logic flow from net is: MGCC issues from the net instruction same period, and pass through voltage magnitude, the frequency information of GOOSE off the net PCC dot system side, after main frame receives instruction, adjustment synchronizing signal, slave is from motion tracking PCC dot system side information of voltage, and MGCC judges to meet the demands the same period from net, issues and turns grid-connected command broadcast order, turn after each equipment of bottom receives instruction and be incorporated into the power networks, complete whole switching flow.In handoff procedure, there is not locking pwm pulse, just control mode switch, only need a break period (relevant with control frequency), and synchronizing signal is transmitted by optical fiber, and on hardware, time delay is about 1us, adopt and can reach seamless switching truly with upper type.
Claims (7)
1. a multi-machine parallel connection and from net seamless switch-over system, it is characterized in that, comprise underlying device, spacing devices and station monitoring and control equipment, described underlying device comprises PCS control cubicle, wind-driven generator, photovoltaic generator, mode switching controller and load governor, described spacing devices is MGCC micro-capacitance sensor Centralized Controller, described PCS control cubicle, wind-driven generator, photovoltaic generator, mode switching controller intercoms respectively by CAN network mutually with load governor, and communicate with MGCC micro-capacitance sensor Centralized Controller respectively by GOOSE network, described MGCC micro-capacitance sensor Centralized Controller is communicated with station monitoring and control equipment by GOOSE network.
2. a kind of multi-machine parallel connection according to claim 1 and from net seamless switch-over system, it is characterized in that, described station monitoring and control equipment comprises monitoring PC, data server, printer and GPS correction device, and described monitoring PC is connected with MGCC micro-capacitance sensor Centralized Controller, data server, printer and GPS correction device respectively.
3. a kind of multi-machine parallel connection according to claim 1 and from net seamless switch-over system, it is characterized in that, described GOOSE network is real-time ethernet.
4. a kind of multi-machine parallel connection according to claim 1 and from net seamless switch-over system, it is characterized in that, described CAN network adopts synchronous optical fiber to carry out information interaction, in order to Phase synchronization.
5. the multi-machine parallel connection of application as described in any one of claim 1-4 and from the changing method of net seamless switch-over system, it is characterized in that, the method comprises also-switch submethod and from-grid-connected switching submethod from net.
6. changing method according to claim 5, is characterized in that, described also-switch submethod from net to comprise the following steps:
11) switch-closed time at the micro-capacitance sensor PCC point place of multi-machine parallel connection is obtained;
12) what MGCC micro-capacitance sensor Centralized Controller sent at reception station monitoring and control equipment issues from the prefabricated broadcasting command of net by GOOSE network after net instruction;
13) PCS control cubicle receives from the prefabricated broadcasting command of net, and makes to receive from the time spent by the prefabricated broadcasting command of net equal with the switch-closed time at micro-capacitance sensor PCC point place;
14) PCS control cubicle sends synchronizing signal to each underlying device by CAN network;
15) underlying device detects synchronizing signal and starts to leave network operation.
7. a kind of changing method according to claim 5, is characterized in that, described comprises the following steps from-grid-connected switching submethod:
21) switch off-time at the micro-capacitance sensor PCC point place of multi-machine parallel connection is obtained;
22) MGCC micro-capacitance sensor Centralized Controller after receiving the grid-connected instruction that sends of station monitoring and control equipment by off the net of GOOSE from the voltage magnitude of the net instruction same period, PCC dot system side and frequency information to PCS control cubicle;
23) after PCS control cubicle receives instruction, adjustment synchronizing signal, the voltage magnitude of underlying device from motion tracking PCC dot system side and frequency information;
24) when from net the instruction same period meet require from net time, MGCC micro-capacitance sensor Centralized Controller issues and turns grid-connected command broadcast order, the time that PCS control cubicle is received spent by grid-connected command broadcast order is equal with the switch off-time at micro-capacitance sensor PCC point place, turns and be incorporated into the power networks after each equipment of bottom receives instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755946.3A CN105281367B (en) | 2015-11-09 | 2015-11-09 | A kind of multi-machine parallel connection and off-network seamless switch-over system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755946.3A CN105281367B (en) | 2015-11-09 | 2015-11-09 | A kind of multi-machine parallel connection and off-network seamless switch-over system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105281367A true CN105281367A (en) | 2016-01-27 |
| CN105281367B CN105281367B (en) | 2018-01-30 |
Family
ID=55149913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510755946.3A Active CN105281367B (en) | 2015-11-09 | 2015-11-09 | A kind of multi-machine parallel connection and off-network seamless switch-over system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105281367B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023748A (en) * | 2016-11-03 | 2018-05-11 | 北京创昱科技有限公司 | A kind of micro-capacitance sensor communication control method, apparatus and system |
| CN108879789A (en) * | 2018-09-03 | 2018-11-23 | 廊坊英博电气有限公司 | Bidirectional energy-storage Variable flow control device and method |
| CN110556875A (en) * | 2018-05-31 | 2019-12-10 | 深圳中广核工程设计有限公司 | Unit synchronization system for large power plant |
| CN110572449A (en) * | 2019-09-04 | 2019-12-13 | 南京国电南自电网自动化有限公司 | Multi-channel cooperative communication system and method for BMS and PCS of energy storage power station |
| CN110739709A (en) * | 2019-11-06 | 2020-01-31 | 湖南微网能源技术有限公司 | multi-machine control synchronization method |
| CN111162564A (en) * | 2020-01-20 | 2020-05-15 | 国电南瑞科技股份有限公司 | Reliable synchronous machine multi-machine parallel synchronous grid-connection method and system |
| CN111786392A (en) * | 2020-07-07 | 2020-10-16 | 中国海洋石油集团有限公司 | Automatic quasi-synchronization grid connection method and system suitable for offshore interconnected power system |
| CN114866148A (en) * | 2022-07-07 | 2022-08-05 | 艾乐德电子（南京）有限公司 | Multi-machine phase synchronization system and method based on optical fiber transmission |
| CN117055449A (en) * | 2023-10-11 | 2023-11-14 | 南京荣泰电气自动化有限公司 | Implementation method of coordination control device for high-capacity energy storage power station |
| CN111373624B (en) * | 2017-11-23 | 2023-11-24 | 日立能源有限公司 | Micro-grid control system and method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694944A (en) * | 2009-10-28 | 2010-04-14 | 盐城工学院 | Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof |
| CN103199529A (en) * | 2013-04-22 | 2013-07-10 | 南京四方亿能电力自动化有限公司 | IEC61850 standard-based microgrid comprehensive coordination control framework |
-
2015
- 2015-11-09 CN CN201510755946.3A patent/CN105281367B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694944A (en) * | 2009-10-28 | 2010-04-14 | 盐城工学院 | Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof |
| CN103199529A (en) * | 2013-04-22 | 2013-07-10 | 南京四方亿能电力自动化有限公司 | IEC61850 standard-based microgrid comprehensive coordination control framework |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023748A (en) * | 2016-11-03 | 2018-05-11 | 北京创昱科技有限公司 | A kind of micro-capacitance sensor communication control method, apparatus and system |
| CN111373624B (en) * | 2017-11-23 | 2023-11-24 | 日立能源有限公司 | Micro-grid control system and method thereof |
| CN110556875A (en) * | 2018-05-31 | 2019-12-10 | 深圳中广核工程设计有限公司 | Unit synchronization system for large power plant |
| CN108879789A (en) * | 2018-09-03 | 2018-11-23 | 廊坊英博电气有限公司 | Bidirectional energy-storage Variable flow control device and method |
| CN110572449B (en) * | 2019-09-04 | 2022-06-17 | 南京国电南自电网自动化有限公司 | Multi-channel cooperative communication system and method for BMS and PCS of energy storage power station |
| CN110572449A (en) * | 2019-09-04 | 2019-12-13 | 南京国电南自电网自动化有限公司 | Multi-channel cooperative communication system and method for BMS and PCS of energy storage power station |
| CN110739709A (en) * | 2019-11-06 | 2020-01-31 | 湖南微网能源技术有限公司 | multi-machine control synchronization method |
| CN111162564A (en) * | 2020-01-20 | 2020-05-15 | 国电南瑞科技股份有限公司 | Reliable synchronous machine multi-machine parallel synchronous grid-connection method and system |
| CN111786392A (en) * | 2020-07-07 | 2020-10-16 | 中国海洋石油集团有限公司 | Automatic quasi-synchronization grid connection method and system suitable for offshore interconnected power system |
| CN111786392B (en) * | 2020-07-07 | 2022-02-01 | 中国海洋石油集团有限公司 | Automatic quasi-synchronization grid connection method and system suitable for offshore interconnected power system |
| CN114866148A (en) * | 2022-07-07 | 2022-08-05 | 艾乐德电子（南京）有限公司 | Multi-machine phase synchronization system and method based on optical fiber transmission |
| CN114866148B (en) * | 2022-07-07 | 2022-09-20 | 艾乐德电子（南京）有限公司 | Multi-machine phase synchronization system and method based on optical fiber transmission |
| TWI828477B (en) * | 2022-07-07 | 2024-01-01 | 大陸商艾樂德電子（南京）有限公司 | Multi-machine phase synchronization system and method based on optical fiber transmission |
| CN117055449A (en) * | 2023-10-11 | 2023-11-14 | 南京荣泰电气自动化有限公司 | Implementation method of coordination control device for high-capacity energy storage power station |
| CN117055449B (en) * | 2023-10-11 | 2023-12-26 | 南京荣泰电气自动化有限公司 | Implementation method of coordination control device for high-capacity energy storage power station |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105281367B (en) | 2018-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105281367A (en) | Multi-parallel grid-connected and off-grid seamless switching system and method thereof | |
| CN104578187B (en) | Multi-terminal flexible direct-current power transmission system-level coordination control device | |
| US9124127B2 (en) | Detecting islanding conditions in power networks | |
| CN103401259B (en) | Seamless switching control method for energy storage system | |
| CN103683283A (en) | Method and system for seamless switching of micro-grid system | |
| CN101795084A (en) | Thyristor rectifier bridge parallel operation full digital current homogenizing control device | |
| CN103414182A (en) | Smooth switching method for converting parallel operation of flexible direct current transmission system into island operation | |
| CN104333042A (en) | Energy storage current transformer grid connection and grid disconnection seamless switching device and method | |
| CN103855722B (en) | A kind of micro-grid connection device | |
| CN106159951A (en) | A kind of composite power source with emergency power supply and active power filtering function | |
| CN105471085A (en) | Power frequency-variable frequency switching control method and apparatus and high voltage inverter | |
| CN202997589U (en) | Microgrid intelligent switch | |
| CN104852372A (en) | Redundancy control method for flexible direct current transmission system | |
| CN104377723A (en) | Transient state process control method for static medium-frequency power supply networking system | |
| CN204179680U (en) | A kind of energy accumulation current converter from net seamless switching control device | |
| Cai et al. | A network model for the real-time communications of a smart grid prototype | |
| CN204481571U (en) | A kind of Loop Closing Operation in Distribution Network control system based on terminal peer-to-peer communications | |
| CN103595128B (en) | Based on the electric substation automation system of double-deck two web frame | |
| CN108400603A (en) | A kind of micro-capacitance sensor that idle delay based on VSG is adjusted is without frequency difference method for handover control | |
| CN112731014A (en) | Island detection method and device for direct-current interconnected power distribution system | |
| US10754317B2 (en) | Control of an electrical power network | |
| CN102664578B (en) | Distributed control system of diesel generators | |
| CN115765194A (en) | Ship electric power monitoring system based on double monitoring networks | |
| CN205753609U (en) | A kind of work frequency conversion switching control and high voltage converter | |
| CN110890846B (en) | High-redundancy synchronous signal switching method for intelligent rectifier bridge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |