CN103683283A - Method and system for seamless switching of micro-grid system - Google Patents
Method and system for seamless switching of micro-grid system Download PDFInfo
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- CN103683283A CN103683283A CN201310722452.6A CN201310722452A CN103683283A CN 103683283 A CN103683283 A CN 103683283A CN 201310722452 A CN201310722452 A CN 201310722452A CN 103683283 A CN103683283 A CN 103683283A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a method and a system for seamless switching of a micro-grid system. The method comprises the following steps that: a first voltage-acquisition module acquires the voltage value of each phase on the grid side connected to the module; PCS determines the electricity losing ratio of the current voltage value of each phase to the standard value, and counts the sum value of the times when the electricity losing ratio of the voltage value of each phase is below the predetermined value; the PCS judges that the sum value is greater than the threshold, and executes VF switching, at the same time triggers off the PCC switch between the grid connected to the switch and the micro-grid. The switching way from the grid-connected mode to the off-grid mode has small impact on the electric current, and is capable of achieving a smooth switching from the grid-connected mode to the off-grid mode.
Description
Technical field
The present invention relates to electric power switching controls field, refer to especially a kind of method and system of micro-grid system seamless switching.
Background technology
In intelligent network, micro-grid system is connected with electrical network by switching device.Switching device comprises controller and PCS device.
In running, after electrical network goes wrong, micro-grid system needs in time the supply of electric power of load equipment to be switched to microgrid from electrical network, and the power supply by microgrid provides electric power for load equipment.
Existing schematic network structure shown in Figure 1, current handoff procedure comprises:
By the signal of telecommunication of micro-grid system controller detection of grid;
Work as electric network fault, the signal of telecommunication of detection is less than threshold value, and controller sends notice to PCS, and PCS sends the signal of telecommunication before electric network fault to microgrid, closes PCC switch simultaneously;
Microgrid is according to this signal of telecommunication synchronizing voltage, amplitude etc., and electric power is provided.
In handoff procedure, grid-connected to being generally two kinds from net VF switching controls algorithm, the first is that the startup of amplitude slope and PI adjusting control realize, and the second is directly given specified amplitude and PI adjusting control realization, and control block diagram as shown in Figure 2.First method control rate is slower, can cause the under-voltage and under-frequency fault of distributed power generation power supply report grid side and quits work; The given method of second method voltage magnitude can cause rush of current in handoff procedure, causes PCS energy accumulation current converter report over current fault, and PCS quits work.
Summary of the invention
In view of this, the invention reside in the method and system that a kind of micro-grid system seamless switching is provided, to solve above-mentioned handoff procedure medium velocity slowly or to impact large problem.
For addressing the above problem, the invention provides a kind of method of micro-grid system seamless switching, comprising:
The first voltage acquisition module gathers each phase voltage value of the grid side of its connection;
PCS determines that the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
PCS judges that the numerical value of described number of times summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
Described dead electricity ratio is:
Current voltage value and described standard value are asked difference, and the ratio of this difference and described standard value is as described dead electricity ratio;
Described predetermined value is between 12%～18%, and described number of times is between 4～8.
Described predetermined value is 15%, and described number of times is 5.
Also comprise: the second voltage acquisition module being connected with microgrid side;
Described PCS is according to the electrical signal collection value of described the first voltage acquisition module and second voltage acquisition module, and the described PCC switch that triggers its connection disconnects.
The present invention also provides a kind of system of micro-grid system seamless switching, comprising:
The first collecting unit, for gathering each phase voltage value of the grid side of its connection by the first voltage acquisition module;
Comparing unit, for determining that by PCS the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
The first control unit, for judging that by PCS the numerical value of described summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
Preferably, also comprise:
The second collecting unit, gathers voltage for the second voltage acquisition module by being connected with microgrid side;
The second control unit, for controlling described PCS according to the electrical signal collection value of described the first voltage acquisition module and second voltage acquisition module, the described PCC switch that triggers its connection is closed.
Method and system of the present invention, by the voltage of grid side relatively, realizes that PCC switch between electrical network and microgrid disconnects or closed, have speed fast, impact little feature.
Accompanying drawing explanation
Fig. 1 is the schematic network structure of prior art;
Fig. 2 be prior art control algolithm block diagram;
Fig. 3 is schematic network structure in the present embodiment;
Fig. 4 is the structural representation of voltage acquisition module in the present embodiment;
Fig. 5 is the structural representation of intelligent PCS energy accumulation current converter in the present embodiment;
Fig. 6 is from the flow chart of network process in the present embodiment;
Fig. 7 is grid-connected to off-grid control algolithm flow chart in the present embodiment;
Fig. 8 is that the present embodiment is grid-connected to off-grid control algolithm block diagram;
Fig. 9 is the grid-connected analogous diagram to switching from net of the present embodiment;
Figure 10 is that the present embodiment is from net to grid-connected handoff procedure;
Figure 11 is that the present embodiment is from net to grid-connected control algolithm flow chart;
Embodiment
For clearly demonstrating the scheme in the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
The structure of the micro-grid system in the embodiment of the present invention, referring to Fig. 3, comprise: intelligent PCS energy accumulation current converter, PCC switch is between city's TV university electrical network and micro-electrical network, and voltage acquisition module V1 and voltage acquisition module V2 are connected between city's TV university electrical network, micro-electrical network and intelligent PCS energy accumulation current converter.
Microgrid intelligence PCS energy accumulation current converter detects large grid line voltage in real time by voltage acquisition module V1, calculates in real time large line voltage amplitude Ugrid phase place
with frequency f grid.By voltage acquisition module V2, detect in real time microgrid line voltage, calculate in real time microgrid voltage magnitude Uminigrid, phase place
with frequency f minigrid.
Intelligence PCS energy accumulation current converter is according to the Data Control PCC switch gathering.
Wherein, voltage acquisition module adopts hardware configuration as shown in Figure 4 to realize, referring to Fig. 4, voltage acquisition module V1 is the same with voltage acquisition module V2 internal structure, voltage acquisition module V1 is comprised of a resistance R 1 and a voltage sensor 1, and voltage acquisition module V2 is comprised of a resistance R 2 and a voltage sensor 2.
Referring to Fig. 5, intelligence PCS energy accumulation current converter adopts structure as shown in Figure 5 to realize, comprise that intelligent PCS energy accumulation current converter central processing unit (for example: DSP) and three phase rectifier/inverter circuit module, wherein intelligent PCS energy accumulation current converter central processing unit comprises data acquisition module, network voltage detection controller, phase difference detection controller, PCC on-off controller, battery management system.
Method of the present invention realizes grid-connected between microgrid and electrical network by above-mentioned Fig. 3,4,5 micro-grid system and from network process.
First illustrate from network process below, referring to Fig. 6, comprising:
S61: the first voltage acquisition module gathers each phase voltage value of the grid side of its connection; The first voltage acquisition module is the voltage acquisition module V1 in Fig. 3;
S62:PCS determines that the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
S63:PCS judges that the numerical value of described number of times summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
The method of embodiments of the invention, calculates PWM output duty cycle by the mode of direct given modulating wave.Can guarantee intelligent PCS energy accumulation current converter Rapid Establishment microgrid reference voltage amplitude and frequency when VF controls grid-connected in net handoff procedure, assurance micro-grid system distributed power source is normally worked.
Flow chart shown in Figure 7, grid-connected to off-grid flow chart, comprise the following steps:
The first voltage acquisition module gathers each phase voltage value of the grid side of its connection;
PCS determines that the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
PCS judges that the numerical value of described summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
Described dead electricity ratio is that current voltage value and described standard value are asked difference, and the ratio of this difference and described standard value is as described dead electricity ratio;
Preferably: described predetermined value is between 12%～18%, described number of times is between 4～8.
Preferably: described predetermined value is 15%, described number of times is 5.
Specific operation process is:
S11: the line voltage of the large electrical network of the first voltage acquisition module V1 Real-time Collection, now count value N=0;
S12: calculate in real time the effective voltage value UA of large electrical network, UB, UC;
S13: compare UA, the whether low amplitude of any phase voltage amplitude of UB or UC three-phase surpasses 15%, if UA, any phase voltage amplitude of UB or UC falls 15%, and now count value N carries out N++ calculating.
S14: if N>5, intelligent PCS energy accumulation current converter carries out grid-connected arriving from net switching controls, starts VF and controls, and exports PCC switch separating brake control signal simultaneously, realizes grid-connected to off-grid seamless switching control.If N<5, intelligent PCS energy accumulation current converter does not carry out grid-connected arriving from net switching, keeps being incorporated into the power networks.If UA, UB, the voltage magnitude of UC three-phase does not all fall 15%, restarts to detect.
Grid-connected in switching from net, the too low susceptibility that can raising system of predetermined value threshold value setting, but can reduce the stability of system; The stability of system is mentioned in the too high meeting of predetermined value threshold value setting, but can reduce the dynamic response of system.
In experimentation, when threshold value being set when being 12%, micro-grid system is to detection of grid three-phase voltage U A, UB or UC parameter change very responsive, cause line voltage transience to decline because of other reasonses such as load increase, capacitance apparatus startups at line voltage after, recover, now can cause micro-grid system and frequently switch from net switch, the load electricity consumption causing occurs abnormal, the fault-toleranr technique of reduction system, reduces micro-grid system stability.
In lab process, when threshold value being set when being 18%, although micro-grid system stability increases, but can cause system parameter variations responsive not, cause system can not detect in time the variation of line voltage, cause each equipment inverter of micro-grid system to break down, micro-grid system breaks down extremely.
Therefore, through experimental data and comprehensive analysis, predetermined value is set to 15%, can meet the susceptibility that micro-grid system changes parameter, can change and make dynamic response parameter simultaneously, meanwhile, also can guarantee that micro-grid system can stability requirement.
Referring to Fig. 8, for grid-connected to off-grid control algolithm block diagram in the present embodiment, pass through above-described embodiment, grid-connected to calculating PWM output duty cycle from net switching controls by the mode of direct given modulating wave, can be grid-connected in net handoff procedure, guarantee intelligent PCS energy accumulation current converter Rapid Establishment microgrid reference voltage amplitude and frequency when VF controls, assurance micro-grid system distributed power source is normally worked.Referring to Fig. 9, the grid-connected analogous diagram to switching from net of the present embodiment, by emulation experiment, can see the switching at zero crossing, and rush of current is very little, can realize grid-connectedly to off-grid, taking over seamlessly.
Embodiment above describes in detail grid-connected to off-grid handoff procedure, and below by embodiment explanation, from net to grid-connected handoff procedure, referring to Figure 10, micro-grid system, from net to grid-connected handoff procedure, comprising:
S101: magnitude of voltage, frequency values and the phase value of the grid side that the first voltage acquisition module collection connects; The phase value of the microgrid side that the collection of second voltage acquisition module connects;
S102:PCS according to described grid side magnitude of voltage regulate and control described microgrid side voltage, according to described grid side frequency values, regulate and control the frequency of described microgrid side;
S103:PCS compares the absolute value of the phase difference of grid side and microgrid side;
S104: be greater than threshold value if determine absolute value, the phase place of controlling described microgrid side is leading or hysteresis respective angles according to the first adjustable range value;
S105: be not more than threshold value if determine absolute value, the phase place of controlling described microgrid side is leading or hysteresis respective angles according to the second adjustable range value;
S106: meet the requirements until determine described absolute value, micro-grid system is switched to grid-connected.
After above-mentioned regulating step, realize from net to grid-connected taking over seamlessly.Below by concrete example in detail said process.Participate in Figure 11, comprising:
From net state, be switched to and during net state, must guaranteeing microgrid ac bus and electrical network ac bus amplitude, phase place are consistent with frequency greatly.The present invention realizes quick adjustment microgrid electrical network phase place, amplitude, frequency adjustment, realize micro-grid system from from net state to and the switching of net state.
Describedly also comprise before from net to grid-connected switching: described second voltage acquisition module V2 gathers magnitude of voltage and the frequency values of described microgrid side; The difference of magnitude of voltage of the more described grid side of described PCS and described microgrid side,, whether the difference of frequency values is less than threshold value, if be less than, is carried out from net to grid-connected operation.Be specially: at micro-grid system, in from Running State, microgrid intelligence PCS energy accumulation current converter is in V/F voltage source control model.Microgrid intelligence PCS energy accumulation current converter can detect microgrid voltage magnitude Uminigrid, phase place in real time by voltage acquisition module V2
with frequency f minigrid; If large electrical network is from dead electricity to restoring electricity, intelligent PCS energy accumulation current converter detects the amplitude Ugrid phase place of large electrical network by voltage acquisition module V1
with frequency f grid.
Amplitude error and the frequency error of due to intelligent PCS energy accumulation current converter, controlling output microgrid line voltage amplitude and frequency and large electrical network are less, can directly carry out micro-grid system voltage and FREQUENCY CONTROL, first voltage reference value Uref=Ugrid microgrid intelligence PCS energy accumulation current converter V/F being controlled, controls micro-grid system voltage magnitude Uminigrid=Ugrid; Then voltage reference value fref=fgrid microgrid intelligence PCS energy accumulation current converter V/F being controlled, controls micro-grid system electric voltage frequency fminigrid=fgrid; The phase error of controlling output microgrid electric network voltage phase and large electrical network due to intelligent PCS energy accumulation current converter is larger, need to regulate the phase place of micro-grid system.
Preferably, described threshold value is 0.5235, and described the first adjustable range value is, between 0.1～0.2; Described the second tune value range is between 0.01～0.02.
From net, to grid-connected handoff procedure, also comprise, judge that described absolute value meets the requirements, micro-grid system is switched to grid-connected process to be comprised: judge that described absolute value is less than 0.087, to PCC switch, send control signal, the closed described electrical network of PCC switch and described microgrid.
Be specially: first calculate micro-grid system and large electrical network phase difference
if
be greater than 0, represent the micro-grid system large electrical network that lags behind, intelligent PCS energy accumulation current converter will reduce
value; If
be less than 0, represent the leading large electrical network of micro-grid system, intelligent PCS energy accumulation current converter will increase
value.Due to
error amount may be larger, directly changes
value may cause the impact of electric current.If
being greater than 0.5235(angle is 30 degree), corresponding micro-grid system
if
being less than 0.5235(angle is 30 degree), corresponding micro-grid system
[(γ
1> γ
2), general γ
1span (0.1～0.2), general γ
2span (0.01～0.02)], if now
being less than 0.087(angle is 5 degree), do not carry out phase adjusted, intelligent PCS energy accumulation current converter output PCC switch energization control signal then, realizes micro-grid system from from net to grid-connected control.
Preferably, described threshold value is 0.5235, and described the first adjustable range value is, between 0.1～0.2; Described the second tune value range is between 0.01～0.02.
In from net to grid-connected switching, in lower than threshold range, step-size in search arranges the accuracy of too high meeting reduction system, but can improve the response speed of system; Step-size in search arranges the response speed of too low meeting reduction system, but can improve the accuracy of system.
In experimentation, when phase difference is greater than threshold value 0.5235(corresponding angle 30 degree) time, step-size in search γ adopted
1span (0.1～0.2) (5.7 °～11.4 ° of corresponding angles).At phase difference, be greater than 30 while spending, guarantee the rapid response speed of system.If γ
1value is less than at 0.1 o'clock, and phase difference reduces Speed Reduction, and corresponding microgrid is followed the tracks of large electrical network phase velocity and reduced, thereby reduces the corresponding speed of micro-grid system; If γ
1value is greater than at 0.2 o'clock, and phase difference reduces speed and improves, and corresponding microgrid is followed the tracks of large electrical network phase velocity and improved, thereby reduces the response speed of micro-grid system, but tracking accuracy reduces, and easily exceeds threshold range, causes the concussion of system.At phase difference, be less than 30 while spending, object is to guarantee systematic tracking accuracy, if γ
2value is greater than at 0.02 o'clock, and phase difference reduces speed and improves, and corresponding microgrid is followed the tracks of large electrical network phase velocity and improved, thereby the corresponding speed of raising micro-grid system has still reduced tracking accuracy; If γ
2value is less than at 0.01 o'clock, and phase difference reduces Speed Reduction, and corresponding microgrid is followed the tracks of large electrical network phase velocity and reduced, but improves the precision of system keeps track, guarantees the stable operation of system.
Therefore, through experimental data and comprehensive analysis, by predetermined value threshold value setting, be 0.5235, be greater than at 0.5235 o'clock, γ
1span (0.1～0.2), γ
2span (0.01～0.02), can meet the susceptibility that micro-grid system changes parameter, can change and make dynamic response parameter simultaneously, meanwhile, also can guarantee that micro-grid system can stability requirement.
The number of times of each phase voltage mistake value ratio of the grid side that described PCS gathers according to described the first voltage acquisition module, triggers described PCC switch and disconnects.
The present invention also provides a kind of system of micro-grid system seamless switching, comprising:
The first collecting unit, for gathering each phase voltage value of the grid side of its connection by the first voltage acquisition module;
Comparing unit, for determining that by PCS the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
The first control unit, for judging that by PCS the numerical value of described summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
Preferably, also comprise:
The second collecting unit, gathers voltage for the second voltage acquisition module by being connected with microgrid side;
The second control unit, for controlling described PCS according to the electrical signal collection value of described the first voltage acquisition module and second voltage acquisition module, the described PCC switch that triggers its connection is closed.
Method and system of the present invention, by the voltage of grid side relatively, realizes that PCC switch between electrical network and microgrid disconnects or closed, have speed fast, impact little feature.
For the method and system of setting forth in each embodiment of the present invention, within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a method for micro-grid system seamless switching, is characterized in that, comprising:
The first voltage acquisition module gathers each phase voltage value of the grid side of its connection;
PCS determines that the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
PCS judges that the numerical value of described number of times summation is greater than threshold value, carries out VF and switches, and the described electrical network and the PCC switch between microgrid that trigger its connection disconnect simultaneously.
2. method according to claim 1, is characterized in that, described dead electricity ratio is:
Current voltage value and described standard value are asked difference, and the ratio of this difference and described standard value is as described dead electricity ratio;
Described predetermined value is between 12%～18%, and described number of times is between 4～8.
3. method according to claim 2, is characterized in that, described predetermined value is 15%, and described number of times is 5.
4. method according to claim 1, is characterized in that, also comprises: the second voltage acquisition module being connected with microgrid side;
Described PCS is according to the electrical signal collection value of described the first voltage acquisition module and second voltage acquisition module, and the described PCC switch that triggers its connection disconnects.
5. a system for micro-grid system seamless switching, is characterized in that, comprising:
The first collecting unit, for gathering each phase voltage value of the grid side of its connection by the first voltage acquisition module;
Comparing unit, for determining that by PCS the current voltage value of every phase voltage is with respect to the dead electricity ratio of standard value, adds up the described dead electricity ratio of each phase voltage lower than the number of times summation of predetermined value;
The first control unit, for judging that by PCS the numerical value of described summation is greater than threshold value, carries out VF and switches, and triggers the electrical network of its connection and the PCC switch between microgrid simultaneously and disconnects.
6. switched system according to claim 5, is characterized in that, also comprises:
The second collecting unit, gathers voltage for the second voltage acquisition module by being connected with microgrid side;
The second control unit, for controlling described PCS according to the electrical signal collection value of described the first voltage acquisition module and second voltage acquisition module, the described PCC switch that triggers its connection is closed.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722452.6A CN103683283B (en) | 2013-12-24 | 2013-12-24 | A kind of method and system of micro-grid system seamless switching |
| RU2015151610A RU2629747C2 (en) | 2013-12-24 | 2014-11-27 | System and method of smooth switching for micro-power system |
| BR112015029845A BR112015029845A2 (en) | 2013-12-24 | 2014-11-27 | uninterrupted switching method for a micro network system and uninterrupted switching system for a micro network system |
| PCT/CN2014/092365 WO2015096586A1 (en) | 2013-12-24 | 2014-11-27 | Seamless switching method and system for micro-grid system |
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| CN201310722452.6A CN103683283B (en) | 2013-12-24 | 2013-12-24 | A kind of method and system of micro-grid system seamless switching |
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| CN103683283B CN103683283B (en) | 2016-08-17 |
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| WO2015096586A1 (en) * | 2013-12-24 | 2015-07-02 | 中国西电电气股份有限公司 | Seamless switching method and system for micro-grid system |
| CN107112761A (en) * | 2014-11-04 | 2017-08-29 | Abb瑞士股份有限公司 | The control of micro-capacitance sensor |
| CN108092247A (en) * | 2016-08-31 | 2018-05-29 | 辛宏影 | A kind of micro-capacitance sensor protective relaying device |
| CN108899935A (en) * | 2018-08-16 | 2018-11-27 | 广州供电局有限公司 | And off-network switching equipment and system |
| CN109066785A (en) * | 2018-08-23 | 2018-12-21 | 上海电气分布式能源科技有限公司 | A kind of micro-capacitance sensor real-time control method and micro-capacitance sensor |
| CN112491089A (en) * | 2020-12-03 | 2021-03-12 | 深圳供电局有限公司 | Micro-grid on-grid and off-grid hybrid switching system and method |
| CN115589026A (en) * | 2022-11-02 | 2023-01-10 | 北京索英电气技术有限公司 | Power supply system and grid-connected and off-grid switching method of energy storage converter |
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| US10332708B2 (en) * | 2015-12-09 | 2019-06-25 | Thales Canada Inc | Seamless switchover system and method |
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Also Published As
| Publication number | Publication date |
|---|---|
| RU2015151610A (en) | 2017-06-13 |
| CN103683283B (en) | 2016-08-17 |
| BR112015029845A2 (en) | 2017-07-25 |
| RU2629747C2 (en) | 2017-09-01 |
| WO2015096586A1 (en) | 2015-07-02 |
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