CN110336321A - A kind of photovoltaic micro and off-network seamless switching control method - Google Patents
A kind of photovoltaic micro and off-network seamless switching control method Download PDFInfo
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- CN110336321A CN110336321A CN201910623764.9A CN201910623764A CN110336321A CN 110336321 A CN110336321 A CN 110336321A CN 201910623764 A CN201910623764 A CN 201910623764A CN 110336321 A CN110336321 A CN 110336321A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/383—
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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 invention discloses a kind of photovoltaic micro and off-network seamless switching control method, it is specified target value by control dominant eigenvalues, reduces transient state transit time, realizes and grid-connected leaves smoothly switching for net mode；Using micro-grid connection same period protective device, realize that off-network turns the full-automatic reliable switching of grid-connect mode.In the present invention: when it is grid-connected turn off-grid operation when, comprise the following steps: (1) Energy Management System back-end data refresh；(2) the active power regulation offset needed for obtaining is calculated；(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated；(4) dominant eigenvalues constant control；(5) dominant eigenvalues are adjusted to target value；When off-network turns grid-connected switching, comprise the following steps: S1: micro-capacitance sensor is in even running under off-grid operation mode；S2: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing；S3: same period protective device differentiates grid-connected conditions；S4: it completes off-network and turns grid-connect mode switching.
Description
Technical field
The present invention relates to a kind of photovoltaic micro and off-network method for handover control, specifically for control photovoltaic micro and
Net leaves net, off-network turns grid-connected switching.
Background technique
Higher structure form of the micro-capacitance sensor as distributed power generation, can be effective by a variety of distributed generation resources, load, energy storage
Ground is organized, both can be grid-connected by points of common connection (Point of Common Coupling, PCC) and external bulk power grid
Operation, can also be with off-network independent operating.With the development of micro-capacitance sensor technology, power supply type, grid-connected mode, energy storage are configured and are born
Lotus composition etc. is complicated and changeable, how to control micro-grid system smooth and seamless switching between simultaneously off-network, it has also become one urgently solves
Technological difficulties certainly.Existing document proposes to control when micro battery is grid-connected using PQ, and when isolated island uses sagging control, and under substantially
Increase sagging rated point in vertical controller and adjust ring, grid-connected smooth turn with isolated island control model is realized by the switching of the loop
It changes.But the frequent switching of control loop adversely affects the duration of customer power supply, especially micro-capacitance sensor framework it is complicated or
In the case that load has particular/special requirement to uninterrupted power supply, micro-grid connection is more difficult to realize seamless switching when leaving net.Therefore,
In this background, the invention proposes a kind of photovoltaic micro simultaneously off-network seamless switching control based on dominant eigenvalues control
Method processed improves micro-grid load power supply duration and power supply quality with important for enhancing new-energy grid-connected friendly
Theory significance and practical value.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of micro- electricity of photovoltaic
On the one hand net and off-network seamless switching control method are to specify target value by control dominant eigenvalues, when reducing transient state transition
Between, realization is grid-connected to leave smoothly switching for net mode；On the other hand micro-grid connection same period protective device is utilized, realizes that off-network turns
The full-automatic reliable switching of grid-connect mode.Photovoltaic micro proposed by the invention and off-network seamless switching control method improve
Micro-grid load power supply duration and power supply quality, while reducing the impact during micro-grid connection to major network, have
Good grid-connected friendly.
In order to achieve the above object, the present invention is achieved by the following scheme:
A kind of photovoltaic micro and off-network seamless switching control method, the photovoltaic micro includes: based on virtual synchronous
Energy-storage units, photovoltaic generation unit, local load, Energy Management System and the micro-grid connection same period protective device of control；Its
It is characterized in that,
When photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, comprise the following steps:
(1) Energy Management System back-end data refresh, obtain micro-capacitance sensor in each energy-storage units, photovoltaic generation unit and
The realtime power of interconnection；
(2) the active power regulation offset needed for obtaining is calculated；
(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated；
(4) dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power；
(5) dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching；
When photovoltaic micro off-network turns grid-connected switching, comprise the following steps:
S1: micro-capacitance sensor is in even running under off-grid operation mode；
S2: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, and grid-connected reclosing command is issued
Give same period protective device；
S3: same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected item
Part；
S4: examining the same period through same period protective device, when meeting grid-connected conditions, automatically controls micro-grid connection switch and closes a floodgate, complete
Turn grid-connect mode switching at off-network.
As a kind of preferred embodiment of the invention:
When photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, comprise the following steps:
(1) Energy Management System back-end data refresh, obtain micro-capacitance sensor in each energy-storage units, photovoltaic generation unit and
The realtime power of interconnection；
(2) it calculates and obtains active power regulation offset；
Assuming that the actual sample value x (n) of current time dominant eigenvalues, target value PIt is constant, then active power regulation compensates
Value are as follows: Δ PIt adjusts=PIt is constant-x(n)；
(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated；
The maximum charge-discharge electric power of each energy-storage units is set toCurrent each energy-storage units
Realtime power isThe range of the external whole potentiality of exchange power adjustable of available each energy-storage units isDefinition set φnFor the set of all VSG, then energy-storage units are adjustable
The range of whole potentiality is
(4) dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power；
WhenPower regulation functions are undertaken by VSG completely；
WhenThat is VSG cannot fully meet power regulation needs, if Δ P at this timeIt adjusts> 0,
Then cut-out local load；If Δ PIt adjusts≤ 0, then photovoltaic generation unit limits Power operation；
(5) dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching；
When photovoltaic micro off-network turns grid-connected switching, comprise the following steps:
S1: micro-capacitance sensor is in even running under off-grid operation mode；
S2: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, and grid-connected reclosing command is issued
Give same period protective device；
S3: same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected item
Part；
When energy-storage units (VSG) receive frequency adjustment instructions, by adjusting self-generating angular frequency, realize to inversion
The adjustment of device output phase θ makes it finally track θPCC, complete VSG phase presynchronization process；Meanwhile to VSG bridge arm voltage
Amplitude is adjusted, and finally makes grid voltage amplitude on inverter output voltage amplitude tracking, completes VSG amplitude presynchronization mistake
Journey；
S4: examining the same period through same period protective device, when meeting grid-connected conditions, automatically controls micro-grid connection switch and closes a floodgate, complete
Turn grid-connect mode switching at off-network.
As a kind of preferred embodiment of the invention:
The energy-storage units based on virtual synchronous control of the micro-capacitance sensor are centralized energy-storage units, pass through the same inversion
Device carries out outputting and inputting for power；
The Energy Management System is more distributed for calculating each distributed electrical source power and load power in micro-capacitance sensor
Power and load power；
The local load is made of flexible load.
The medicine have the advantages that
A kind of photovoltaic micro disclosed by the invention and off-network seamless switching control method, when micro-capacitance sensor is turned by grid-connect mode
It is specified target value by control dominant eigenvalues when for off-network mode, reduces the impact of switching transient process to power quality
Influence, reduce transient state transit time；Off-network turn grid-connected switching when, micro-capacitance sensor under the adjusting of Energy Management System, automatically with
Track major network frequency, voltage and phase, by micro-grid connection same period protective device differentiate grid-connected conditions, realize photovoltaic micro by
Full-automatic reliable switching of the off-grid operation mode to the mode of being incorporated into the power networks reduces impact of the micro-grid connection in the process to major network.
Detailed description of the invention
Fig. 1 is dominant eigenvalues control flow chart；
Fig. 2 is grid-connected to leave net moment micro-capacitance sensor voltage and grid voltage waveform；
Fig. 3 off-network turns grid-connected moment micro-capacitance sensor voltage and grid voltage waveform.
Specific embodiment
The specific embodiment of the invention is described with reference to the accompanying drawings and embodiments:
As shown in Figure 1-3, it illustrates a specific embodiment of the invention, as shown, photovoltaic proposed by the present invention is micro-
Power grid specifically includes that energy-storage units, photovoltaic generation unit, local load, energy management system based on virtual synchronous control (VSG)
System, micro-grid connection same period protective device.
Embodiment 1:
Based on virtual synchronous control energy-storage units of (VSG), photovoltaic generation unit, local load, Energy Management System, micro-
The grid-connected same period protective device of power grid.
A kind of photovoltaic micro disclosed by the invention and off-network seamless switching control method realize that micro-grid connection leaves net
Turn grid-connected with off-network to smoothly switch.
When photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, for reduce simultaneously/off-network switch transient process impact
Influence to power quality reduces transient state transit time, before switching tests, by microgrid energy management system, adjusts in advance
Energy storage charge-discharge electric power is saved, dominant eigenvalues between micro-capacitance sensor and major network is made within an acceptable range, to carry out simultaneously/off-network switching behaviour
Make.Main implementation process is described as follows:
1, Energy Management System back-end data refresh, obtain micro-capacitance sensor in each energy-storage units, photovoltaic generation unit and
The realtime power of interconnection.
2, the active power regulation offset needed for obtaining is calculated.
3, the range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated.
4, dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power.
5, dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching.
The unplanned grid-connected net that leaves of micro-capacitance sensor switches, and the power rush in transient process relies on the energy-storage units of multi-machine parallel connection
(VSG) it undertakes.
When photovoltaic micro off-network turns grid-connected switching, micro-capacitance sensor automatically tracks master under the adjusting of Energy Management System
Net frequency, voltage and phase differentiate grid-connected conditions by micro-grid connection same period protective device, realize photovoltaic micro by off-network
Full-automatic reliable switching of the operational mode to the mode of being incorporated into the power networks reduces impact of the micro-grid connection in the process to major network.Micro- electricity
During switching from off-network mode to grid-connect mode, the electric voltage frequency support of system is switched to net by energy-storage units (VSG)
Main power grid is instantaneously born the mutation of active power and reactive power brought by being shifted by load by VSG.Main implementation process is retouched
It states as follows:
1, micro-capacitance sensor is in even running under off-grid operation mode；
2, Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, and grid-connected reclosing command is handed down to
Same period protective device；
3, same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected conditions；
4, the same period is examined through same period protective device, when meeting grid-connected conditions, automatically controls micro-grid connection switch and close a floodgate, complete
Off-network turns grid-connect mode switching.
Embodiment 2:
A kind of photovoltaic micro disclosed by the invention and off-network seamless switching control method realize that micro-grid connection leaves net
Turn grid-connected with off-network to smoothly switch.
One, when photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, switch transient process to reduce simultaneously/off-network and rush
The influence to power quality is hit, reduces transient state transit time, before switching tests, by microgrid energy management system, in advance
Energy storage charge-discharge electric power is adjusted, dominant eigenvalues between micro-capacitance sensor and major network is made within an acceptable range, to carry out simultaneously/off-network switching behaviour
Make.
When photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, main implementation process comprises the following steps:
(1) Energy Management System back-end data refresh, obtain micro-capacitance sensor in each energy-storage units, photovoltaic generation unit and
The realtime power of interconnection.
(2) it calculates and obtains active power regulation offset.
Assuming that the actual sample value x (n) of current time dominant eigenvalues, target value PIt is constant, then active power regulation compensates
Value are as follows: Δ PIt adjusts=PIt is constant-x(n)。
(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated.
The maximum charge-discharge electric power of each energy-storage units is set toCurrent each energy-storage units
Realtime power isThe range of the external whole potentiality of exchange power adjustable of available each energy-storage units isDefinition set φnFor the set of all VSG, then energy-storage units are adjustable
The range of whole potentiality is
(4) dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power.
WhenPower regulation functions are undertaken by VSG completely.
WhenThat is VSG cannot fully meet power regulation needs, if Δ P at this timeIt adjusts> 0,
Then cut-out local load；If Δ PIt adjusts≤ 0, then photovoltaic generation unit limits Power operation.
(5) dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching.
The unplanned grid-connected net that leaves of micro-capacitance sensor switches, and the power rush in transient process relies on the energy-storage units of multi-machine parallel connection
(VSG) it undertakes.
Two, when photovoltaic micro off-network turns grid-connected switching, micro-capacitance sensor automatically tracks under the adjusting of Energy Management System
Major network frequency, voltage and phase, by micro-grid connection same period protective device differentiate grid-connected conditions, realize photovoltaic micro by from
Full-automatic reliable switching of the net operational mode to the mode of being incorporated into the power networks reduces impact of the micro-grid connection in the process to major network.It is micro-
During switching from off-network mode to grid-connect mode, the electric voltage frequency support of system is switched power grid by energy-storage units (VSG)
To main power grid, the mutation of active power and reactive power brought by being shifted by load is instantaneously born by VSG.
When photovoltaic micro off-network turns grid-connected switching, main implementation process is comprised the following steps:
S100: micro-capacitance sensor is in even running under off-grid operation mode；
S200: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, will be under grid-connected reclosing command
Issue same period protective device；
S300: same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected item
Part；
When energy-storage units (VSG) receive frequency adjustment instructions, by adjusting self-generating angular frequency, realize to inversion
The adjustment of device output phase θ makes it finally track θPCC, complete VSG phase presynchronization process；Meanwhile to VSG bridge arm voltage
Amplitude is adjusted, and finally makes grid voltage amplitude on inverter output voltage amplitude tracking, completes VSG amplitude presynchronization mistake
Journey.
S400: examining the same period through same period protective device, when meeting grid-connected conditions, automatically controls micro-grid connection switch and closes a floodgate,
It completes off-network and turns grid-connect mode switching.
Correctness and feasibility to illustrate the invention, to the photovoltaic micro and off-network seamless switching controlling party proposed
Method has carried out field demonstration.
Fig. 2 gives grid-connected leave and nets moment micro-capacitance sensor voltage (1,2,3) and network voltage (4,5,6) waveform, tests wave
Shape is shown: it is grid-connected to leave micro- undistorted no impact of voltage on line side in net handoff procedure, realize smooth transition.Fig. 3 gives off-network
Turn grid-connected moment micro-capacitance sensor voltage (1,2,3) and network voltage (4,5,6) waveform, test waveform is shown: micro-capacitance sensor turns in off-network
In grid-connected handoff procedure, power grid is not caused to impact, realizes smooth transition.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes, these variations are related to the relevant technologies well-known to those skilled in the art, these both fall within the invention patent
Protection scope.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (3)
1. a kind of photovoltaic micro and off-network seamless switching control method, the photovoltaic micro includes: based on virtual synchronous control
Energy-storage units, photovoltaic generation unit, local load, Energy Management System and the micro-grid connection same period protective device of system；It is special
Sign is,
When photovoltaic micro it is planned by it is grid-connected turn off-grid operation when, comprise the following steps:
(1) Energy Management System back-end data refreshes, and obtains each energy-storage units, photovoltaic generation unit and contact in micro-capacitance sensor
The realtime power of line；
(2) the active power regulation offset needed for obtaining is calculated；
(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated；
(4) dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power；
(5) dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching；
When photovoltaic micro off-network turns grid-connected switching, comprise the following steps:
S1: micro-capacitance sensor is in even running under off-grid operation mode；
S2: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, and grid-connected reclosing command is handed down to together
Phase protective device；
S3: same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected conditions；
S4: through same period protective device examine the same period, when meeting grid-connected conditions, automatically control micro-grid connection switch close a floodgate, complete from
Net turns grid-connect mode switching.
2. a kind of photovoltaic micro as described in claim 1 and off-network seamless switching control method, it is characterised in that: work as photovoltaic
Micro-capacitance sensor it is planned by it is grid-connected turn off-grid operation when, comprise the following steps:
(1) Energy Management System back-end data refreshes, and obtains each energy-storage units, photovoltaic generation unit and contact in micro-capacitance sensor
The realtime power of line；
(2) it calculates and obtains active power regulation offset；
Assuming that the actual sample value x (n) of current time dominant eigenvalues, target value PIt is constant, then active power regulation offset
Are as follows: Δ PIt adjusts=PIt is constant-x(n)；
(3) range that energy-storage units externally exchange the whole potentiality of power adjustable is calculated；
The maximum charge-discharge electric power of each energy-storage units is set toCurrently each energy-storage units is real-time
Power isThe range of the external whole potentiality of exchange power adjustable of available each energy-storage units isDefinition set φnFor the set of all VSG, then energy-storage units are adjustable
The range of whole potentiality is
(4) dominant eigenvalues constant control is realized by adjusting energy-storage units, photovoltaic generation unit and load power；
WhenPower regulation functions are undertaken by VSG completely；
WhenThat is VSG cannot fully meet power regulation needs, if Δ P at this timeIt adjusts> 0, then cut
Except the local load in part；If Δ PIt adjusts≤ 0, then photovoltaic generation unit limits Power operation；
(5) dominant eigenvalues are adjusted to target value, cut off grid-connected switch, and realization is grid-connected to leave net pattern switching；
When photovoltaic micro off-network turns grid-connected switching, comprise the following steps:
S1: micro-capacitance sensor is in even running under off-grid operation mode；
S2: Energy Management System receives the micro-grid connection reclosing command of dispatching down distributing, and grid-connected reclosing command is handed down to together
Phase protective device；
S3: same period protective device issues frequency, voltage regulating command to motor synchronizing voltage source inverter, differentiates grid-connected conditions；
When energy-storage units (VSG) receive frequency adjustment instructions, by adjusting self-generating angular frequency, realize defeated to inverter
The adjustment of phase theta out makes it finally track θPCC, complete VSG phase presynchronization process；Meanwhile to VSG bridge arm voltage amplitude
It is adjusted, finally makes grid voltage amplitude on inverter output voltage amplitude tracking, complete VSG amplitude presynchronization process；
S4: through same period protective device examine the same period, when meeting grid-connected conditions, automatically control micro-grid connection switch close a floodgate, complete from
Net turns grid-connect mode switching.
3. a kind of photovoltaic micro as described in claim 1 and off-network seamless switching control method, it is characterised in that: described micro-
The energy-storage units based on virtual synchronous control of power grid are centralized energy-storage units, carry out the defeated of power by the same inverter
Enter and exports；
The Energy Management System compares distributed generation resource for calculating each distributed electrical source power and load power in micro-capacitance sensor
Power and load power；
The local load is made of flexible load.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112234635A (en) * | 2020-10-29 | 2021-01-15 | 合肥阳光新能源科技有限公司 | New energy storage system and power adjusting method and power distribution method thereof |
| CN112910002A (en) * | 2021-02-26 | 2021-06-04 | 南京南瑞继保电气有限公司 | Smooth switching method and device for self-adaptive main power supply operation mode of microgrid |
| CN114221377A (en) * | 2021-11-16 | 2022-03-22 | 云南电网有限责任公司迪庆供电局 | Grid-connected and off-grid multi-energy-storage response control method and system |
-
2019
- 2019-07-11 CN CN201910623764.9A patent/CN110336321A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112234635A (en) * | 2020-10-29 | 2021-01-15 | 合肥阳光新能源科技有限公司 | New energy storage system and power adjusting method and power distribution method thereof |
| CN112910002A (en) * | 2021-02-26 | 2021-06-04 | 南京南瑞继保电气有限公司 | Smooth switching method and device for self-adaptive main power supply operation mode of microgrid |
| CN112910002B (en) * | 2021-02-26 | 2023-09-08 | 南京南瑞继保电气有限公司 | Micro-grid self-adaptive main power supply operation mode smooth switching method and device |
| CN114221377A (en) * | 2021-11-16 | 2022-03-22 | 云南电网有限责任公司迪庆供电局 | Grid-connected and off-grid multi-energy-storage response control method and system |
| CN114221377B (en) * | 2021-11-16 | 2023-08-22 | 云南电网有限责任公司迪庆供电局 | Off-grid multi-energy-storage response control method and system |
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Application publication date: 20191015 |