CN105281367B - A kind of multi-machine parallel connection and off-network seamless switch-over system - Google Patents
A kind of multi-machine parallel connection and off-network seamless switch-over system Download PDFInfo
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- CN105281367B CN105281367B CN201510755946.3A CN201510755946A CN105281367B CN 105281367 B CN105281367 B CN 105281367B CN 201510755946 A CN201510755946 A CN 201510755946A CN 105281367 B CN105281367 B CN 105281367B
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- 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
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Abstract
The present invention relates to a kind of multi-machine parallel connection and off-network seamless switch-over system and its method, comprise the following steps：1) underlying device is incorporated into the power networks；2) MGCC issues the prefabricated broadcasting command of off-network；3) bottom main frame receives the prefabricated order of off-network；4) when bottom Host Detection is to zero crossing, synchronizing signal is sent to each bottom slave devices；5) slave devices detect synchronizing signal and start to leave network operation；6) MGCC issues the instruction of the off-network same period, and passes through voltage magnitude, the frequency information of GOOSE hair PCC dot systems sides off the net；7) MGCC judges that the off-network same period meets to require, issues and turns grid-connected command broadcast order, and each equipment of bottom turns to be incorporated into the power networks after receiving instruction, completes whole switching flow.Compared with prior art, the present invention has the advantages that seamless, synchronism switching.
Description
Technical field
The present invention relates to field of power, more particularly, to a kind of multi-machine parallel connection and off-network seamless switch-over system.
Background technology
At present, in micro-capacitance sensor, electric automobile electric charging station, extensive energy-accumulating power station application field, to ensure simultaneously off-network
Switch successfully, typically realized using two hard 4 kinds of combinations of node signal, because device locking pwm pulse be present in centre,
The process that low latency PCC points disconnect or closed occurs in waiting process is switched, so can not realize truly
Seamless switching, the power failure phenomenon in short-term of important load can be caused, cause important load can not normal work, if deposited in system
In diesel-driven generator, diesel-driven generator short-time overload can be caused, have a strong impact on the service life of bavin hair；Secondly, in more machine equipments
During parallel running, an off-grid operation typically is used, other use and are incorporated into the power networks, when load is more than unitary device capacity, this
When and off-network switching device can be caused to overload, handoff failure.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of multi-machine parallel connection and
Off-network seamless switch-over system.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of multi-machine parallel connection and off-network seamless switch-over system, including underlying device, spacing devices and station monitoring and control equipment are described
Underlying device include PCS switch boards, wind-driven generator, photovoltaic generator, mode switching controller and load governor, it is described
Spacing devices be MGCC micro-capacitance sensor Centralized Controllers, described PCS switch boards, wind-driven generator, photovoltaic generator, pattern are cut
Changer controller and load governor are in communication with each other by CAN network respectively, and pass through GOOSE network and MGCC micro-capacitance sensors respectively
Centralized Controller is communicated, and described MGCC micro-capacitance sensors Centralized Controller is communicated by GOOSE network with station monitoring and control equipment.
Described station monitoring and control equipment includes monitoring PC, data server, printer and GPS correction devices, described monitoring PC
It is connected respectively with MGCC micro-capacitance sensors Centralized Controller, data server, printer and GPS correction devices.
Described GOOSE network is real-time ethernet.
Described CAN network carries out information exchange using synchronization optical fiber, to Phase synchronization.
A kind of multi-machine parallel connection and off-network seamless handover method, this method include simultaneously-off-network switching submethod and from-it is grid-connected
Switch submethod.
Described and-off-network switching submethod comprises the following steps：
11) switch-closed time at the micro-capacitance sensor PCC points of multi-machine parallel connection is obtained；
12) under MGCC micro-capacitance sensors Centralized Controller is after the off-network instruction that reception station monitoring and control equipment is sent by GOOSE network
Send out the prefabricated broadcasting command of off-network；
13) PCS switch boards receive the prefabricated broadcasting command of off-network, and make to receive spent by the prefabricated broadcasting command of off-network
Time is equal with the switch-closed time at micro-capacitance sensor PCC points；
14) PCS switch boards send synchronizing signal to each underlying device by CAN network；
15) underlying device detects synchronizing signal and starts to leave network operation.
It is described to comprise the following steps from-grid-connected switching submethod：
21) switch off-time at the micro-capacitance sensor PCC points of multi-machine parallel connection is obtained；
22) MGCC micro-capacitance sensors Centralized Controller after the grid-connected instruction that sends of station monitoring and control equipment is received by GOOSE hairs off the net
The instruction of the off-network same period, the voltage magnitude of PCC dot systems side and frequency information to PCS switch boards；
23) after PCS switch boards receive instruction, synchronizing signal, electricity of the underlying device from motion tracking PCC dot systems side are adjusted
Pressure amplitude value and frequency information；
24) when the instruction of the off-network same period meets off-network requirement, MGCC micro-capacitance sensor Centralized Controllers, which issue, turns grid-connected instruction extensively
Order is broadcast, PCS switch boards is received the time spent by grid-connected command broadcast order and switching off at micro-capacitance sensor PCC points
Time is equal, and each equipment of bottom turns to be incorporated into the power networks after receiving instruction.
Compared with prior art, the present invention has advantages below：
First, seamless and off-network switches, the present invention by control PCS switch boards receive time from grid-connected broadcasting instructions with it is micro-
Switch opening/closing time at power network PCC points is equal, switches realize multi-machine parallel connection and off-network.
2nd, synchronism switching：The present invention uses GOOSE network and high-speed CAN network service, and wherein GOOSE network is 100,000,000
Bandwidth Ethernet, high-speed CAN network are communicated using synchronization optical fiber between underlying device, and the switch at micro-capacitance sensor PCC points moves
It is about 1us as the time, ensure that the real-time transmitted in information.
Brief description of the drawings
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 off-network switch logic figure.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
As shown in figure 1, figure is multi-machine parallel connection synchronous interaction schematic diagram, whole multi-machine parallel connection and off-network seamless switch-over system
It is divided into three-layer network framework, underlying device includes：PCS racks and battery, wind-driven generator, photovoltaic generator, power load, guarantor
Protect unit, MC, LC (wherein MC mode switching controllers and LC load governors can be put into wall MGCC to realize), interval
Equipment is mainly MGCC micro-capacitance sensor Centralized Controllers, and spacing devices use double-network communication with underlying device, and first network mainly passes
The data of the non real-time nature such as defeated PCS remote measurement and remote signalling, BMS information, this kind of data demand response time is slow, communication protocol
For IEC61850, the remote control of the second network prevailing transmission, the part remote signalling of remote regulating and some participation system controls and telemetry intelligence (TELINT) etc.
Real-time amount, due to requiring the response time than very fast, the partial information is less, using GOOSE agreements.MGCC micro-capacitance sensor centralized Controls
Device receives station monitoring and control equipment and issues switching command, is issued to each underlying device by GOOSE broadcasting commands, each underlying device receives
The execution switched over after instruction.
PCS racks are attached by CAN and each underlying device, transmit real-time active and reactive power and now
The machine and machine preparation instruction, when any controller receives power information, according to now effective PCS number in bus, carry out
Mean power calculates, at the same PCS racks receive that overlayer monitors issue open, stop, reset instruction carries out relevant control to slave.
The fault message of the machine is sent out from PCS racks, when a certain underlying device is in failure, above send malfunction to other devices,
PCS racks and machine preparation instruction are set to disarmed state simultaneously, other devices are according to the number of warning order, to carry out average work(
The calculating of rate.Synchronizing signal produces：Synchronizing signal is to interrupt to count according to control by PCS racks to produce, PCS racks and other bottoms
Layer equipment reception synchronizing signal is consistent, and when underlying device receives synchronizing signal, bottom controller judges synchronizing signal hopping edge,
Bottom controller is triggered by hardware interrupts, after bottom controller receives hardware interrupts, off-grid zero passage lock phase is carried out, completes same
Step process.
Pi is system active power in Fig. 2, and Qi is system reactive power, and Pave is computing system active power set-point,
Qave is the idle set-point of computing system, and when impedance is pure perceptual, inverter output voltage d axis component differences cause idle inequality
Weighing apparatus, q axle differences cause active output circulation.In order to realize the equilibrium of inverter output power, can be controlled in contravarianter voltage outer
The PI controls of power equalization are added, to suppress the circulation between inverter.Due to needing detecting system to export active and reactive power,
Therefore 20ms delay is added, its governing speed is slower, but stream effect is preferable, and stability is high, has stronger
Disturbance rejection.
As shown in figure 3, the grid-connected net logic flow that leaves is in figure：Underlying device is incorporated into the power networks, and it is prefabricated that MGCC issues off-network
Broadcasting command, bottom main frame judge synchronizing signal zero crossing after receiving the prefabricated order of off-network, left when detecting zero crossing
Network operation, while synchronizing signal is sent out to each bottom slave devices, when slave devices detect synchronizing signal hopping edge, leave net fortune
OK.Off-network turns grid-connected logic flow：MGCC issues the instruction of the off-network same period, and passes through the GOOSE electricity off the net for generating PCC dot systems side
Pressure amplitude value, frequency information, after main frame receives instruction, synchronizing signal is adjusted, slave is believed from motion tracking PCC dot systems side voltage
Breath, MGCC judge that the off-network same period meets to require, issue a turn grid-connected command broadcast order, and each equipment of bottom turns simultaneously after receiving instruction
Network operation, complete whole switching flow.In handoff procedure, in the absence of locking pwm pulse, simply control mode switch, only needs one
Individual break period (relevant with control frequency), and synchronizing signal is transmitted by optical fiber, and be delayed about 1us on hardware, adopts
It can reach seamless switching truly to upper type.
Claims (4)
1. a kind of multi-machine parallel connection and off-network seamless switch-over system, it is characterised in that including underlying device, spacing devices and station control
Equipment, described underlying device include PCS switch boards, wind-driven generator, photovoltaic generator, mode switching controller and load control
Device processed, described spacing devices are MGCC micro-capacitance sensor Centralized Controllers, described PCS switch boards, wind-driven generator, photovoltaic generation
Machine, mode switching controller and load governor are in communication with each other by CAN network respectively, and respectively by GOOSE network with
MGCC micro-capacitance sensors Centralized Controller is communicated, and described MGCC micro-capacitance sensor Centralized Controllers are led to by GOOSE network and station monitoring and control equipment
Letter；
Include simultaneously-off-network switching submethod and from-grid-connected switching side using the switching method of this and off-network seamless switch-over system
Method；
Described and-off-network switching submethod comprises the following steps：
11) switch-closed time at the micro-capacitance sensor PCC points of multi-machine parallel connection is obtained；
12) MGCC micro-capacitance sensors Centralized Controller receive station monitoring and control equipment send off-network instruction after by GOOSE network issue from
Net prefabricated broadcasting command；
13) PCS switch boards receive the prefabricated broadcasting command of off-network, and make to receive the time spent by the prefabricated broadcasting command of off-network
It is equal with the switch-closed time at micro-capacitance sensor PCC points；
14) PCS switch boards send synchronizing signal to each underlying device by CAN network；
15) underlying device detects synchronizing signal and starts to leave network operation；
It is described to comprise the following steps from-grid-connected switching submethod：
21) switch off-time at the micro-capacitance sensor PCC points of multi-machine parallel connection is obtained；
22) MGCC micro-capacitance sensors Centralized Controller after the grid-connected instruction that sends of station monitoring and control equipment is received by GOOSE hair off-networks off the net
Same period instruction, the voltage magnitude of PCC dot systems side and frequency information to PCS switch boards；
23) after PCS switch boards receive instruction, synchronizing signal, voltage amplitude of the underlying device from motion tracking PCC dot systems side are adjusted
Value and frequency information；
24) when the instruction of the off-network same period meets off-network requirement, MGCC micro-capacitance sensor Centralized Controllers, which issue, turns grid-connected command broadcast life
Order, PCS switch boards are made to receive the time spent by grid-connected command broadcast order and the switch off-time at micro-capacitance sensor PCC points
Equal, each equipment of bottom turns to be incorporated into the power networks after receiving instruction.
2. a kind of multi-machine parallel connection according to claim 1 and off-network seamless switch-over system, it is characterised in that described station
Controlling equipment includes monitoring PC, data server, printer and GPS correction devices, described monitoring PC respectively with MGCC micro-capacitance sensors
Centralized Controller, data server, printer connect with GPS correction devices.
3. a kind of multi-machine parallel connection according to claim 1 and off-network seamless switch-over system, it is characterised in that it is described
GOOSE network is real-time ethernet.
4. a kind of multi-machine parallel connection according to claim 1 and off-network seamless switch-over system, it is characterised in that it is described
CAN network carries out information exchange using synchronization optical fiber, to Phase synchronization.
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| CN201510755946.3A CN105281367B (en) | 2015-11-09 | 2015-11-09 | A kind of multi-machine parallel connection and off-network seamless switch-over system |
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| CN201510755946.3A CN105281367B (en) | 2015-11-09 | 2015-11-09 | A kind of multi-machine parallel connection and off-network seamless switch-over system |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108023748B (en) * | 2016-11-03 | 2023-08-01 | 紫石能源有限公司 | Micro-grid communication control method, device and system |
| US11056890B2 (en) * | 2017-11-23 | 2021-07-06 | Abb Power Grids Switzerland Ag | Microgrid 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 |
| 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 |
| CN111162564B (en) * | 2020-01-20 | 2021-05-07 | 国电南瑞科技股份有限公司 | Reliable synchronous machine multi-machine parallel synchronous grid-connection method and 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 |
| 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 |
| 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 |
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| 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 |
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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 |
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