CN108649568B - Off-grid micro-grid system and control method - Google Patents
Off-grid micro-grid system and control method Download PDFInfo
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- CN108649568B CN108649568B CN201810519385.0A CN201810519385A CN108649568B CN 108649568 B CN108649568 B CN 108649568B CN 201810519385 A CN201810519385 A CN 201810519385A CN 108649568 B CN108649568 B CN 108649568B
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- 238000010248 power generation Methods 0.000 claims abstract description 20
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- H02J3/005—
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H02J3/385—
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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 provides an off-grid micro-grid system and a control method, wherein the system comprises two diesel generators, energy storage equipment, photovoltaic power generation equipment and a user load, the energy storage equipment and the photovoltaic power generation equipment are respectively converged into a direct current bus through a DCDC converter, the direct current bus can directly supply power for the direct current load, and the direct current bus is connected into an alternating current power grid through a DCAC converter and the diesel generators through a step-up transformer and then supplies power for the user load through a distribution transformer; the diesel generator, the DCDC converter and the DCAC converter are directly connected to the microgrid controller through communication lines for information interaction, the microgrid controller sends acquired information to the microgrid energy management system, and running state information of the whole microgrid is displayed; the diesel generator or the energy storage equipment can be used as a main power source of the micro-grid system and can be switched seamlessly, reliability of power utilization of users is guaranteed, and the micro-grid system is suitable for practical engineering application.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to an off-grid micro-grid system and a control method.
Background
Many islands and remote areas are far away from a large power grid, the power transmission line is difficult to cover and cannot be networked with a continental power grid, and the users are difficult to use and expensive. At present, the power consumption of the users mainly depends on a diesel generator, the operation cost is high, the conditions of unstable voltage, power failure and the like are frequently met, the normal operation of a communication base station is influenced, and the factors seriously influence the normal production and life of the users.
Because the wind and light resources in the regions are rich, the access of new energy can reduce the electricity consumption cost of users, the economy is high, and the access of energy storage equipment can ensure the reliability of the electricity consumption of the users. In view of this, an off-grid micro-grid system is provided, which is suitable for practical engineering application.
Disclosure of Invention
The invention aims to provide an off-grid micro-grid system and a control method, which solve the problems of power utilization reliability and economy of users in islands and remote areas.
In order to achieve the above purpose, the solution proposed by the present invention is: an off-grid microgrid system comprising: the microgrid energy management system comprises two diesel generators, energy storage equipment, photovoltaic power generation equipment, a DCDC converter, a DCAC converter, a step-up transformer, a distribution transformer, a user load, a microgrid controller and a microgrid energy management system; wherein the content of the first and second substances,
the user load comprises a direct current load and an alternating current load;
the energy storage equipment and the photovoltaic power generation equipment are respectively connected with the direct current bus through a DCDC converter; the direct current bus is connected with a direct current load; the direct current bus is connected to the alternating current bus 1 through a DCAC converter; the diesel generator is connected with an alternating current bus 1; the alternating current bus 1 is connected with the alternating current bus 2 through a step-up transformer; one end of the distribution transformer is connected with the alternating current bus 2, and the other end of the distribution transformer is connected with an alternating current load;
the diesel generator, the DCDC converter and the DCAC converter are directly connected to the microgrid controller through communication lines for information interaction; the microgrid controller is connected with the microgrid energy management system, the acquired information is sent to the microgrid energy management system, and the running state information of the whole microgrid is displayed; the microgrid controller controls the start and stop of the diesel generator and the opening and closing of the switch through the outlet hard contact.
In the system, the microgrid controller, the energy storage device DCDC converter and the DCAC converter are arranged in the same container, and information is uploaded and controlled through a GOOSE communication network.
In the system, the microgrid controller, the diesel generator and the DCDC converter of the photovoltaic power generation equipment are communicated in an optical fiber, network cable or twisted pair mode according to field engineering conditions, and the communication protocol is MODBUS, IEC60870-5-103 or IEC 61850.
The invention correspondingly provides a control method of an off-grid micro-grid system, wherein a micro-grid controller controls the starting and stopping of a diesel generator and the opening and closing of a switch through an outlet hard contact, and seamlessly switches the diesel generator or an energy storage device to be used as a main power supply of the micro-grid system;
the two diesel generators are respectively as follows: diesel generator 1 and diesel generator 2;
the operation mode of the off-grid micro-grid system comprises a diesel light storage operation mode and a light storage operation mode; the firewood light storage operation mode comprises a firewood light storage operation mode 1 and a firewood light storage operation mode 2;
when the micro-grid system is in a diesel optical storage operation mode 1, the diesel generator 1 is operated as a main power supply, the diesel generator 2 is in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode and operates in a peak clipping and valley filling mode, and the DCAC converter is in a direct current bus voltage control mode;
when the micro-grid system is in a diesel optical storage operation mode 2, the diesel generator 2 operates as a main power supply, the diesel generator 1 operates in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter operates in a power control mode in a peak clipping valley filling mode, and the DCAC converter operates in a direct current bus voltage control mode;
when the diesel generators operate as a main power supply, the two diesel generators can be synchronously and seamlessly switched.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the electric quantity of the energy storage equipment is sufficient, the microgrid controller switches the operation modes of the DCDC converter and the DCAC converter of the energy storage equipment, the outlet switch of the diesel generator is tripped off, the diesel generator is stopped, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a diesel-optical storage operation mode 1, the diesel generator 1 is operated as a main power supply, the diesel generator 2 is in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode, at the moment, the microgrid energy management system or a microgrid controller sets a power instruction fixed value to issue a power instruction to the energy storage equipment, the energy storage equipment is operated in a peak clipping valley filling mode, and the two diesel generators can be seamlessly alternately overhauled; when the diesel generator 1 needs to be alternately overhauled, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts the diesel generator 2, the diesel generator 2 is automatically switched on and off in the same period after the diesel generator 2 is started, and then the diesel generator 1 is switched on and off and the diesel generator 1 is stopped; when the diesel generator 2 needs to be alternately overhauled, the same switching mode is adopted.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage equipment is sufficient in electric quantity, the microgrid controller switches the DCDC converter of the energy storage equipment to be in a direct-current bus voltage control mode, switches the DCAC converter to be in a virtual synchronous generator VSG mode, trips the grid-connected switch of the diesel generator and stops the diesel generator, the system is switched to an optical storage operation mode, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage device is sufficient in electric quantity, the microgrid energy management system issues a switching instruction to the microgrid controller, the microgrid controller receives the instruction and then sends a mode instruction and a switching instruction to the energy storage device DCDC converter and the DCAC converter, the energy storage device DCDC converter receives the instruction and then switches the operation mode to a direct-current bus voltage control mode, the DCAC converter receives the instruction and then switches the operation mode to a virtual synchronous generator VSG mode, after the switching is completed, a diesel generator grid-connected switch is tripped off and the diesel generator is stopped, the system is switched to an optical storage operation mode, and the energy storage device converter serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the system can operate normally.
In the control method, when the microgrid system is in a light storage operation mode, the energy storage equipment operates as a main power supply, when the electric quantity of the energy storage equipment is insufficient, the microgrid controller starts the diesel generator, the outlet switch of the diesel generator is switched on, the operation modes of the DCDC converter and the DCAC converter of the energy storage equipment are switched, and the diesel generator serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a light storage operation mode, the energy storage device operates as a main power supply, when the energy storage device is insufficient in electricity, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts the diesel generator after receiving the instruction, mode instructions and switching instructions are sent to the energy storage device DCDC converter and the DCAC converter, the DCAC converter adjusts the voltage frequency of the power grid according to the voltage frequency of the outlet of the diesel generator after receiving the instruction, after the adjustment is finished, the diesel generator grid-connected switch is automatically turned on at the same time, the energy storage device DCDC converter is in a power control mode and operates in a peak clipping and valley filling mode, the DCAC converter is in a direct-current bus voltage control mode, the system is switched to a diesel light storage operation mode 1 or a diesel light storage operation mode 2, and the diesel generator serves as the main power supply to maintain the voltage frequency of the system to be stable, and ensuring the normal operation of the system.
The invention has the beneficial effects that: the off-grid micro-grid system is provided, and aims to realize the reliability and economy of power utilization of users, guarantee uninterrupted power supply when a diesel generator needs to be overhauled, save economic cost by efficiently utilizing new energy and reduce environmental pollution. The system is simple in operation and maintenance, and meets the living and production requirements of users.
Drawings
Fig. 1 is a system configuration diagram of an off-grid microgrid system.
Fig. 2 is an operation mode diagram of an off-grid microgrid system.
Detailed Description
The technical scheme is explained in detail in the following with the accompanying drawings.
The invention provides an off-grid micro-grid system, the system structure diagram of which is shown in figure 1, and the off-grid micro-grid system comprises: the microgrid energy management system comprises two diesel generators, energy storage equipment, photovoltaic power generation equipment, a DCDC converter, a DCAC converter, a step-up transformer, a distribution transformer, a user load, a microgrid controller and a microgrid energy management system; wherein the user load comprises a DC load and an AC load; the energy storage equipment and the photovoltaic power generation equipment are respectively connected with the direct current bus through a DCDC converter; the direct current bus is connected with a direct current load; the direct current bus is connected to the alternating current bus 1 through a DCAC converter; the diesel generator is connected with an alternating current bus 1; the alternating current bus 1 is connected with the alternating current bus 2 through a step-up transformer; one end of the distribution transformer is connected with the alternating current bus 2, and the other end of the distribution transformer is connected with an alternating current load; the diesel generator, the DCDC converter and the DCAC converter are directly connected to the microgrid controller through communication lines for information interaction; the microgrid controller is connected with the microgrid energy management system, the acquired information is sent to the microgrid energy management system, and the running state information of the whole microgrid is displayed; the microgrid controller controls the start and stop of the diesel generator and the opening and closing of the switch through the outlet hard contact. The microgrid controller, the energy storage device DCDC converter and the DCAC converter are arranged in the same container, and information uploading and control are carried out through a GOOSE communication network. The microgrid controller, the diesel generator and the DCDC converter of the photovoltaic power generation equipment are communicated in an optical fiber, network cable or twisted pair mode according to field engineering conditions, and the communication protocol is MODBUS, IEC60870-5-103 or IEC 61850.
The invention correspondingly provides a control method of an off-grid micro-grid system, wherein a micro-grid controller controls the starting and stopping of a diesel generator and the opening and closing of a switch through an outlet hard contact, and seamlessly switches the diesel generator or an energy storage device to be used as a main power supply of the micro-grid system; the two diesel generators are respectively as follows: diesel generator 1 and diesel generator 2; the operation mode of the off-grid micro-grid system comprises a diesel light storage operation mode and a light storage operation mode; the firewood light storage operation mode comprises a firewood light storage operation mode 1 and a firewood light storage operation mode 2; the operation of which is shown in figure 2.
When the micro-grid system is in a diesel optical storage operation mode 1, the diesel generator 1 is operated as a main power supply, the diesel generator 2 is in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode and operates in a peak clipping and valley filling mode, and the DCAC converter is in a direct current bus voltage control mode;
when the micro-grid system is in a diesel optical storage operation mode 2, the diesel generator 2 operates as a main power supply, the diesel generator 1 operates in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter operates in a power control mode in a peak clipping valley filling mode, and the DCAC converter operates in a direct current bus voltage control mode;
when the diesel generators operate as a main power supply, the two diesel generators can be synchronously and seamlessly switched.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the electric quantity of the energy storage equipment is sufficient, the microgrid controller switches the operation modes of the DCDC converter and the DCAC converter of the energy storage equipment, the outlet switch of the diesel generator is tripped off, the diesel generator is stopped, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a diesel-optical storage operation mode 1, the diesel generator 1 is operated as a main power supply, the diesel generator 2 is in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode, at the moment, the microgrid energy management system or a microgrid controller sets a power instruction fixed value to issue a power instruction to the energy storage equipment, the energy storage equipment is operated in a peak clipping valley filling mode, and the two diesel generators can be seamlessly alternately overhauled; when the diesel generator 1 needs to be alternately overhauled, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts the diesel generator 2, the diesel generator 2 is automatically switched on and off in the same period after the diesel generator 2 is started, and then the diesel generator 1 is switched on and off and the diesel generator 1 is stopped; when the diesel generator 2 needs to be alternately overhauled, the same switching mode is adopted.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage equipment is sufficient in electric quantity, the microgrid controller switches the DCDC converter of the energy storage equipment to be in a direct-current bus voltage control mode, switches the DCAC converter to be in a virtual synchronous generator VSG mode, trips the grid-connected switch of the diesel generator and stops the diesel generator, the system is switched to an optical storage operation mode, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage device is sufficient in electric quantity, the microgrid energy management system issues a switching instruction to the microgrid controller, the microgrid controller receives the instruction and then sends a mode instruction and a switching instruction to the energy storage device DCDC converter and the DCAC converter, the energy storage device DCDC converter receives the instruction and then switches the operation mode to a direct-current bus voltage control mode, the DCAC converter receives the instruction and then switches the operation mode to a virtual synchronous generator VSG mode, after the switching is completed, a diesel generator grid-connected switch is tripped off and the diesel generator is stopped, the system is switched to an optical storage operation mode, and the energy storage device converter serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the system can operate normally.
In the control method, when the microgrid system is in a light storage operation mode, the energy storage equipment operates as a main power supply, when the electric quantity of the energy storage equipment is insufficient, the microgrid controller starts the diesel generator, the outlet switch of the diesel generator is switched on, the operation modes of the DCDC converter and the DCAC converter of the energy storage equipment are switched, and the diesel generator serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
In the control method, when the microgrid system is in a light storage operation mode, the energy storage device operates as a main power supply, when the energy storage device is insufficient in electricity, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts the diesel generator after receiving the instruction, mode instructions and switching instructions are sent to the energy storage device DCDC converter and the DCAC converter, the DCAC converter adjusts the voltage frequency of the power grid according to the voltage frequency of the outlet of the diesel generator after receiving the instruction, after the adjustment is finished, the diesel generator grid-connected switch is automatically turned on at the same time, the energy storage device DCDC converter is in a power control mode and operates in a peak clipping and valley filling mode, the DCAC converter is in a direct-current bus voltage control mode, the system is switched to a diesel light storage operation mode 1 or a diesel light storage operation mode 2, and the diesel generator serves as the main power supply to maintain the voltage frequency of the system to be stable, and ensuring the normal operation of the system.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (7)
1. A control method of an off-grid micro-grid system is characterized by comprising the following steps:
the off-grid microgrid system comprises: the microgrid energy management system comprises two diesel generators, energy storage equipment, photovoltaic power generation equipment, a DCDC converter, a DCAC converter, a step-up transformer, a distribution transformer, a user load, a microgrid controller and a microgrid energy management system; wherein the content of the first and second substances,
the user load comprises a direct current load and an alternating current load;
the energy storage equipment and the photovoltaic power generation equipment are respectively connected with the direct current bus through a DCDC converter; the direct current bus is connected with a direct current load; the direct current bus is connected to the alternating current bus 1 through a DCAC converter; the diesel generator is connected with an alternating current bus 1; the alternating current bus 1 is connected with the alternating current bus 2 through a step-up transformer; one end of the distribution transformer is connected with the alternating current bus 2, and the other end of the distribution transformer is connected with an alternating current load;
the diesel generator, the DCDC converter and the DCAC converter are directly connected to the microgrid controller through communication lines for information interaction; the microgrid controller is connected with the microgrid energy management system, the acquired information is sent to the microgrid energy management system, and the running state information of the whole microgrid is displayed;
the microgrid controller controls the start and stop of the diesel generator and the opening and closing of the switch through the outlet hard contact, and seamlessly switches the diesel generator or the energy storage equipment as a main power supply of the microgrid system; the two diesel generators are respectively as follows: diesel generator 1 and diesel generator 2; the operation mode of the off-grid micro-grid system comprises a diesel light storage operation mode and a light storage operation mode; the firewood light storage operation mode comprises a firewood light storage operation mode 1 and a firewood light storage operation mode 2;
when the micro-grid system is in a diesel optical storage operation mode 1, the diesel generator 1 is operated as a main power supply, the diesel generator 2 is in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode and operates in a peak clipping and valley filling mode, and the DCAC converter is in a direct current bus voltage control mode;
when the micro-grid system is in a diesel optical storage operation mode 2, the diesel generator 2 operates as a main power supply, the diesel generator 1 operates in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter operates in a power control mode in a peak clipping valley filling mode, and the DCAC converter operates in a direct current bus voltage control mode;
when the diesel generators operate as a main power supply, the two diesel generators can be synchronously and seamlessly switched;
when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage equipment is sufficient in electric quantity, the microgrid controller switches the DCDC converter of the energy storage equipment to be in a direct-current bus voltage control mode, switches the DCAC converter to be in a virtual synchronous generator VSG mode, trips the grid-connected switch of the diesel generator and stops the diesel generator, the system is switched to an optical storage operation mode, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured;
when the microgrid system is in a light storage operation mode, the energy storage equipment operates as a main power supply, when the electric quantity of the energy storage equipment is insufficient, the microgrid controller starts the diesel generator, the diesel generator outlet switch is switched on, the operation modes of the energy storage equipment DCDC converter and the DCAC converter are switched, and the diesel generator serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
2. The method for controlling an off-grid microgrid system as claimed in claim 1, characterized in that: the microgrid controller, the energy storage device DCDC converter and the DCAC converter are arranged in the same container, and information uploading and control are carried out through a GOOSE communication network.
3. The method for controlling an off-grid microgrid system as claimed in claim 1, characterized in that: the microgrid controller, the diesel generator and the DCDC converter of the photovoltaic power generation equipment are communicated in an optical fiber, network cable or twisted pair mode according to field engineering conditions, and the communication protocol is MODBUS, IEC60870-5-103 or IEC 61850.
4. The method for controlling an off-grid microgrid system as claimed in claim 1, characterized in that: when the microgrid system is in a diesel light storage operation mode, the diesel generator operates as a main power supply, when the electric quantity of the energy storage equipment is sufficient, the microgrid controller switches the operation modes of the DCDC converter and the DCAC converter of the energy storage equipment, the outlet switch of the diesel generator is tripped off, the diesel generator is stopped, and the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is ensured.
5. The method for controlling an off-grid microgrid system as claimed in claim 4, characterized in that: when the microgrid system is in a diesel optical storage operation mode 1, the diesel generator 1 operates as a main power supply, the diesel generator 2 operates in a standby state, the photovoltaic power generation equipment is in a maximum power point tracking state, the energy storage equipment DCDC converter is in a power control mode, at the moment, the microgrid energy management system or the microgrid controller sets a power instruction fixed value to issue a power instruction to the energy storage equipment, the energy storage equipment operates in a peak clipping valley filling mode, and the two diesel generators can be maintained in a seamless rotation mode; when the diesel generator 1 needs to be alternately overhauled, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts the diesel generator 2, the diesel generator 2 is automatically switched on and off in the same period after the diesel generator 2 is started, and then the diesel generator 1 is switched on and off and the diesel generator 1 is stopped; when the diesel generator 2 needs to be alternately overhauled, the same switching mode is adopted.
6. The method for controlling an off-grid microgrid system as claimed in claim 1, characterized in that: when the microgrid system is in a diesel-optical storage operation mode, the diesel generator operates as a main power supply, when the energy storage equipment is sufficient in electric quantity, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller receives the instruction and then sends a mode instruction and a switching instruction to the energy storage equipment DCDC converter and the DCAC converter, the energy storage equipment DCDC converter receives the instruction and then switches the operation mode to a direct-current bus voltage control mode, the DCAC converter receives the instruction and then switches the operation mode to a virtual synchronous generator VSG mode, after the switching is completed, a diesel generator grid-connected switch is tripped off and the diesel generator is stopped, the system is switched to an optical storage operation mode, the energy storage equipment serves as the main power supply to maintain the voltage frequency of the system to be stable, and the normal operation of the system is guaranteed.
7. The method for controlling an off-grid microgrid system as claimed in claim 1, characterized in that: when the microgrid system is in a light storage operation mode, the energy storage device operates as a main power supply, when the energy storage device is insufficient in electricity, the microgrid energy management system sends a switching instruction to the microgrid controller, the microgrid controller starts a diesel generator after receiving the instruction, mode instructions and conversion instructions are sent to a DCDC converter and a DCAC converter of the energy storage device, the DCAC converter adjusts the voltage frequency of the power grid according to the voltage frequency at the outlet of the diesel generator after receiving the instruction, after the adjustment is finished, the diesel generator grid-connected switch is turned on in the automatic detection period, the energy storage device DCDC converter switching mode is in a power control mode and operates in a peak clipping and valley filling mode, the DCAC converter switching mode is in a direct current bus voltage control mode, the system is switched to a diesel light storage operation mode 1 or a diesel light storage operation mode 2, and the diesel generator serves as a main power supply to maintain the voltage frequency of the system to be stable, so that the normal operation of the system is guaranteed.
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| CN201810519385.0A CN108649568B (en) | 2018-05-28 | 2018-05-28 | Off-grid micro-grid system and control method |
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| CN201810519385.0A CN108649568B (en) | 2018-05-28 | 2018-05-28 | Off-grid micro-grid system and control method |
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| CN108649568B true CN108649568B (en) | 2022-02-18 |
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| CN110048463A (en) * | 2019-05-23 | 2019-07-23 | 南京国电南自新能源工程技术有限公司 | Efficiency light oil storage independence micro-capacitance sensor suitable for high altitudes and cold |
| CN110556817B (en) * | 2019-09-16 | 2021-01-15 | 珠海格力电器股份有限公司 | Direct-current micro-grid system and control method thereof |
| CN110824275A (en) * | 2019-11-13 | 2020-02-21 | 国网山西省电力公司电力科学研究院 | Micro-grid AC/DC bus interface converter demonstration test platform |
| CN111009928A (en) * | 2019-12-16 | 2020-04-14 | 深圳合纵能源技术有限公司 | Active switching control method for off-grid micro-grid main power supply |
| CN111416386A (en) * | 2020-04-01 | 2020-07-14 | 广东安朴电力技术有限公司 | Power transmission system and power supply device thereof |
| CN111555365B (en) * | 2020-04-15 | 2022-07-22 | 南京南瑞继保电气有限公司 | Control method and control device of micro-grid system and micro-grid system |
| CN111628522A (en) * | 2020-04-27 | 2020-09-04 | 合肥阳光新能源科技有限公司 | Light storage diesel micro-grid system and control method thereof |
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