CN114825448A - AC/DC hybrid micro-grid control architecture and control method - Google Patents
AC/DC hybrid micro-grid control architecture and control method Download PDFInfo
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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
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an alternating current-direct current hybrid micro-grid control architecture and a control method, wherein the control architecture comprises a high-low voltage conversion power frequency isolation transformer, an STS transient switching device and an alternating current bus; the PCS device is used for performing bidirectional AC or DC energy conversion and adjusting active power or reactive power in a grid-connected mode; the direct current bus is the direct current output of the PCS device and is connected with various direct current loads; a photovoltaic panel; a fan; the electric vehicle charging pile is connected to the direct current bus through the bidirectional DCDC, and charges the electric vehicle through the energy of the direct current bus; a microgrid interconnection system; the invention can greatly improve the stability of the system, and the PCS device only carries out active and reactive power demand regulation, off-grid switching, frequency modulation and other AC side demand function control on the AC side no matter in a grid-connected mode or an off-grid mode.
Description
Technical Field
The invention relates to an alternating current-direct current hybrid microgrid control architecture and a control method, and belongs to the technical field of microgrids.
Background
With the increasing development of new energy industry, the application range of energy storage and micro-grid is more and more extensive, especially the application scene of multi-source fusion such as photovoltaic, wind power, new energy electric automobile is related to, and the requirement on the control architecture of the whole system is higher and higher. The existing common microgrid architecture comprises a common alternating current bus control architecture, a common direct current bus control architecture and an alternating current-direct current hybrid microgrid control architecture, and has advantages according to different system requirements.
The current common control strategy is that an STS switching device is closed in a grid-connected mode, an alternating current bus provides energy for each alternating current load, a PCS device works in a grid-connected PQ mode and simultaneously stabilizes the voltage of a direct current side bus, and each DCDC and ACDC device in a direct current lower stage operates according to an EMS control framework instruction. STS auto-change over device disconnection under the off-grid mode, PCS work stabilize alternating current side contravariant voltage at independent contravariant VF mode, stabilize direct current bus voltage through DCDC by super-capacitor and energy storage battery this moment, and the real-time behavior according to wind-powered electricity generation, photovoltaic and direct current charging pile adjusts simultaneously. Due to the fact that the PCS needs to perform active and reactive power regulation, off-grid and grid-connected switching, frequency modulation and other complex working conditions on the alternating current side, the system can be switched for many times in two modes of the PCS stable direct current bus and the DCDC stable direct current bus, and stability and reliability of the system are prone to being poor. Especially, the addition of multiple sources in the application scenario of interconnection of multiple piconets may increase the instability of the system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides an alternating current-direct current hybrid micro-grid control architecture and a control method, and greatly improves the stability of a system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides an ac/dc hybrid microgrid control architecture, including:
the high-voltage side and the low-voltage side of the high-voltage and low-voltage conversion power frequency isolation transformer are connected with a 10kv power grid, and the low-voltage side of the high-voltage and low-voltage conversion power frequency isolation transformer is connected with a micro-grid system;
the upper stage of the STS transient switching device is connected with the low-voltage side of the high-low voltage conversion power frequency isolation transformer, and the lower stage of the STS transient switching device is connected with the AC side of the PCS device;
the alternating current bus is the lower-level output of the STS transient switching device, and an alternating current load and a PCS device are connected to the bus in a hanging mode;
the PCS device is used for performing bidirectional AC or DC energy conversion and adjusting active power or reactive power in a grid-connected mode;
the direct current bus is the direct current output of the PCS device, and various direct current loads are connected to the direct current bus and used for summarizing the various direct current loads and energy interaction among the direct current loads;
the photovoltaic panel is connected to the direct current bus through a power optimizer MPPT and outputs the maximum photovoltaic power to the direct current bus;
the wind energy is output to the direct current bus by the fan through the ACDC converter;
the electric vehicle charging pile is connected to the direct current bus through the bidirectional DCDC and charges the electric vehicle through the energy of the direct current bus;
and the microgrid interconnection system is connected to the direct-current bus and used for realizing microgrid interconnection.
The energy storage battery is connected to the direct current bus through the bidirectional DCDC and used for absorbing one or more of photovoltaic power and wind power, and meanwhile, the direct current bus is stably supported through DCDC charging and discharging;
the system further comprises a super capacitor, wherein the super capacitor is connected to the direct current bus through bidirectional DCDC and is used for absorbing one or more of photovoltaic and wind energy, and the direct current bus is stably supported through DCDC charging and discharging;
further, the PCS device supports a frequency modulation function.
Further, the PCS device supports an alternating current load hung on an alternating current bus in an off-grid mode through alternating current output.
Furthermore, electric automobile fills electric pile and uses two-way electric pile that fills for carry out charge-discharge to the electric automobile battery.
In a second aspect, the present invention provides a method for controlling an ac/dc hybrid microgrid control architecture according to any one of the preceding claims, comprising:
under a grid-connected mode or an off-grid mode, the bidirectional DCDC connected with the PCS device, the super capacitor and the energy storage battery of the direct-current bus work in a direct-current voltage stabilization mode, the bidirectional DCDC performs energy charge and discharge control according to the fluctuation of bus voltage, the power optimizer on the photovoltaic panel performs maximum power output, and once the power optimizer enters a bus high-voltage mode, the power optimizer enters a constant-voltage limited-emission mode.
Further, the method comprises the following steps:
the system is divided into a first-level response and a second-level scheduling, wherein: the first-level response is at ms level, and the module control framework is used for quickly responding; and the secondary scheduling is performed by a superior control framework, so that the stable operation of the system is kept, and all subsystems are independently decoupled to operate.
Further, the method comprises the following steps:
after the microgrid interconnection system receives a microgrid interconnection instruction, a microgrid interconnection direct current bus switch is closed after the voltage of an internal direct current bus is adjusted to a target value, a large impact current exists between direct current buses at the closing moment, various direct current power electronic devices connected to the direct current buses are decoupled to operate respectively, a primary response method and a secondary scheduling method are also adopted, the primary response is controlled by each subsystem to operate stably, and the secondary scheduling is scheduled by a superior master control system to realize the stable operation of microgrid interconnection.
Further, the method comprises the following steps:
after the microgrid interconnection system receives a microgrid disconnection instruction, a microgrid interconnection direct-current bus switch is disconnected, voltage overcharging exists in a direct-current bus at the moment of disconnection, at the moment, each subsystem automatically stabilizes the voltage of the direct-current bus, a primary response and secondary scheduling method is also adopted, the primary response is automatically controlled by each subsystem to operate stably, and the secondary scheduling is scheduled by a superior master control system to realize stable operation after the microgrid is disconnected.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an alternating current-direct current hybrid microgrid control architecture and a control method, which can greatly improve the stability of a system.
Drawings
Fig. 1 is a schematic structural diagram of an ac/dc hybrid microgrid control architecture according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an ac/dc hybrid microgrid control architecture according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in fig. 1, the present embodiment introduces an ac/dc hybrid microgrid control architecture, including:
the high-voltage side and the low-voltage side of the high-voltage and low-voltage conversion power frequency isolation transformer are connected with a 10kv power grid, and the low-voltage side is 380VAC connected with a micro-grid system;
the upper stage of the STS transient switching device is connected with the low-voltage side of the high-low voltage conversion power frequency isolation transformer, and the lower stage of the STS transient switching device is connected with the AC side of the PCS device; and an STS internal switch is closed in the grid-connected mode, and the STS is automatically opened in the off-grid mode to disconnect the micro-grid system from the large power grid for energy self-circulation. After the mains supply is recovered, the STS automatically detects the voltage and the phase of the power grid, communicates with the PCS converter to carry out AC side synchronization, and then the STS internal switch is closed to connect the micro-grid system into the large power grid. Intelligent automatic off-grid and on-grid switching is realized;
the AC bus is the lower-level output of the STS transient switching device, is 380VAC, and is connected with an AC load and a PCS device;
the PCS device is used for performing bidirectional AC or DC energy conversion and adjusting active power or reactive power in a grid-connected mode; the PCS device supports a frequency modulation function; the PCS device outputs alternating current to support alternating current load hung on an alternating current bus in an off-grid mode;
the direct current bus is the direct current output of the PCS device, and various direct current loads are connected to the direct current bus and used for summarizing the various direct current loads and energy interaction among the direct current loads;
the photovoltaic panel is connected to the direct current bus through a power optimizer MPPT and outputs the maximum photovoltaic power to the direct current bus;
the wind energy is output to the direct current bus by the fan through the ACDC converter;
the electric vehicle charging pile is connected to the direct current bus through the bidirectional DCDC, and charges the electric vehicle through the energy of the direct current bus; the electric vehicle charging pile uses a bidirectional charging pile and is used for charging and discharging an electric vehicle battery;
and the microgrid interconnection system is connected to the direct-current bus and used for realizing microgrid interconnection.
The energy storage battery is connected to the direct current bus through the bidirectional DCDC and used for absorbing one or more of photovoltaic power and wind power, and meanwhile, the direct current bus is stably supported through DCDC charging and discharging;
the super capacitor is connected to the direct current bus through bidirectional DCDC and used for absorbing one or more of photovoltaic and wind energy, and meanwhile, the direct current bus is stably supported through DCDC charging and discharging;
example 2
Referring to fig. 2, the present embodiment provides a control method of the ac/dc hybrid microgrid control architecture according to any one of embodiment 1, including:
under the grid-connected or off-grid mode: the PCS connected with the direct-current bus, the super capacitor and the bidirectional DCDC connected with the energy storage battery all work in a direct-current voltage stabilization mode, the bidirectional DCDC performs energy charging and discharging control according to the fluctuation of bus voltage, the photovoltaic optimizer performs maximum power output, and once the bidirectional DCDC enters a bus high-voltage mode, the power optimizer enters a constant-voltage limited-power mode. The working modes of the wind energy converter and the photovoltaic optimizer are the same. The direct current fills electric pile and charges according to the vehicle demand, accepts total control system scheduling operation simultaneously.
In the strategy, the system is divided into a primary response and a secondary scheduling, wherein the primary response is an ms level and is quickly responded by a module control system. And the secondary scheduling is performed by the superior control system, so that the stable operation of the system is kept, and all subsystems are independently decoupled to operate.
The control strategy can ensure the stable operation of a single system, and the same control mode is adopted in the microgrid interconnection mode without adopting a complex parallel operation mode, so that the decoupling operation of the whole system is realized, and the reliability is improved.
A microgrid interconnection mode:
micro-grid interconnection: after a single microgrid system receives a microgrid interconnection instruction, a microgrid interconnection direct-current bus switch is closed after the voltage of an internal direct-current bus is adjusted to a target value, large impact current exists between direct-current buses at the closing moment, various direct-current power electronic devices connected to the direct-current buses are decoupled to operate respectively, and a primary response and a secondary scheduling strategy are also adopted. The first-stage response is controlled by each subsystem to operate stably, the second-stage scheduling is scheduled by the upper-stage master control system, and finally stable operation of interconnection of the micro-grids is achieved.
Separation of the microgrid: after the single microgrid system receives the microgrid disengaging instruction, the microgrid interconnection direct-current bus switch is disconnected, voltage overcharge exists in the direct-current bus at the moment of disconnection, the direct-current bus voltage is stabilized by each subsystem, and a primary response and secondary scheduling strategy is adopted. The primary response is controlled by each subsystem to operate stably, the secondary scheduling is scheduled by the superior master control system, and stable operation of the micro-grid after the micro-grid is separated is finally achieved.
The invention can greatly improve the stability of the system, and the PCS device only carries out active and reactive power demand regulation, off-grid switching, frequency modulation and other AC side demand function control on the AC side no matter in a grid-connected mode or an off-grid mode.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An AC/DC hybrid microgrid control architecture, comprising:
the high-voltage side and the low-voltage side of the high-voltage and low-voltage conversion power frequency isolation transformer are connected with a 10kv power grid, and the low-voltage side of the high-voltage and low-voltage conversion power frequency isolation transformer is connected with a micro-grid system;
the upper stage of the STS transient switching device is connected with the low-voltage side of the high-low voltage conversion power frequency isolation transformer, and the lower stage of the STS transient switching device is connected with the AC side of the PCS device;
the alternating current bus is the lower-level output of the STS transient switching device, and an alternating current load and a PCS device are connected to the bus in a hanging mode;
the PCS device is used for performing bidirectional AC or DC energy conversion and adjusting active power or reactive power in a grid-connected mode;
the direct current bus is the direct current output of the PCS device, and various direct current loads are connected to the direct current bus and used for summarizing the various direct current loads and energy interaction among the direct current loads;
the photovoltaic panel is connected to the direct current bus through a power optimizer MPPT and outputs the maximum photovoltaic power to the direct current bus;
the wind energy is output to the direct current bus by the fan through the ACDC converter;
the electric vehicle charging pile is connected to the direct current bus through the bidirectional DCDC, and charges the electric vehicle through the energy of the direct current bus;
and the microgrid interconnection system is connected to the direct-current bus and used for realizing microgrid interconnection.
2. The ac-dc hybrid microgrid control architecture of claim 1, wherein: the energy storage battery is connected to the direct current bus through the bidirectional DCDC and used for absorbing one or more of photovoltaic and wind energy, and meanwhile, the direct current bus is stably supported through DCDC charging and discharging.
3. The ac-dc hybrid microgrid control architecture of claim 2, wherein: the photovoltaic wind-driven generator further comprises a super capacitor, wherein the super capacitor is connected to the direct current bus through a bidirectional DCDC and used for absorbing one or more of photovoltaic and wind energy, and meanwhile, the direct current bus is stably supported through DCDC charging and discharging.
4. The ac-dc hybrid microgrid control architecture of claim 1, wherein: the PCS device supports frequency modulation functionality.
5. The ac-dc hybrid microgrid control architecture of claim 1, wherein: and the PCS device supports an alternating current load hung on an alternating current bus in an off-grid mode through alternating current output.
6. The ac-dc hybrid microgrid control architecture of claim 1, wherein: electric automobile fills electric pile and uses two-way electric pile that fills for carry out the charge-discharge to electric automobile battery.
7. A control method of the AC/DC hybrid micro-grid control architecture according to any one of claims 3-6, comprising:
under a grid-connected mode or an off-grid mode, the bidirectional DCDC connected with the PCS device, the super capacitor and the energy storage battery of the direct-current bus work in a direct-current voltage stabilization mode, the bidirectional DCDC performs energy charge and discharge control according to the fluctuation of bus voltage, the power optimizer on the photovoltaic panel performs maximum power output, and once the power optimizer enters a bus high-voltage mode, the power optimizer enters a constant-voltage limited-emission mode.
8. The method for controlling the AC/DC hybrid microgrid control architecture of claim 7, comprising:
the system is divided into a first-level response and a second-level scheduling, wherein: the first-level response is at ms level, and the module control framework is used for quickly responding; and the secondary scheduling is performed by a superior control framework, so that the stable operation of the system is kept, and all subsystems are independently decoupled to operate.
9. The method for controlling the AC/DC hybrid microgrid control architecture of claim 7, comprising:
after the microgrid interconnection system receives a microgrid interconnection instruction, a microgrid interconnection direct current bus switch is closed after the voltage of an internal direct current bus is adjusted to a target value, a large impact current exists between direct current buses at the closing moment, various direct current power electronic devices connected to the direct current buses are decoupled to operate respectively, a primary response method and a secondary scheduling method are also adopted, the primary response is controlled by each subsystem to operate stably, and the secondary scheduling is scheduled by a superior master control system to realize the stable operation of microgrid interconnection.
10. The method for controlling the AC/DC hybrid microgrid control architecture of claim 7, characterized by comprising:
after the microgrid interconnection system receives a microgrid disconnection instruction, a microgrid interconnection direct-current bus switch is disconnected, voltage overcharging exists in a direct-current bus at the moment of disconnection, at the moment, each subsystem automatically stabilizes the voltage of the direct-current bus, a primary response and secondary scheduling method is also adopted, the primary response is automatically controlled by each subsystem to operate stably, and the secondary scheduling is scheduled by a superior master control system to realize stable operation after the microgrid is disconnected.
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| CN116054292A (en) * | 2023-02-15 | 2023-05-02 | 青岛鼎信通讯科技有限公司 | Multi-port circuit conversion system for AC/DC hybrid micro-grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116054292A (en) * | 2023-02-15 | 2023-05-02 | 青岛鼎信通讯科技有限公司 | Multi-port circuit conversion system for AC/DC hybrid micro-grid |
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