CN110535190B - Local control method of household micro-grid energy router energy management unit - Google Patents
Local control method of household micro-grid energy router energy management unit 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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
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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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
Abstract
A local control method of a household micro-grid energy router energy management unit aims at the problems of stable operation, cooperative control and the like of a household micro-grid system formed by household photovoltaic power generation equipment, lithium battery energy storage equipment and typical household appliances, and the household micro-grid energy router energy management unit equipment is developed; when the mains supply fails, the system is locally linked with a direct-current lighting main control unit DCU, and an MEMS simple scheduling command is executed, so that the most suitable household micro-grid supplies power to the direct-current lighting LEDs, and the main-standby complementation of the alternating-current power grid and the household optical storage direct-current micro-grid is realized; the EMU integrates a singlechip with different operation control strategies, and provides a set of control logic of the household micro-grid in a grid-connected mode, a grid-off mode and a limited mode, so that the coordination control of the household micro-grid routing energy management and scheduling and the multi-voltage-level sequence AC/DC bus energy flow is realized, and the maximum utilization of photovoltaic power generation is realized.
Description
Technical Field
The invention relates to the field of application problems of household distributed photovoltaic power generation, lithium battery energy storage, integrated optimization control and management of typical household appliances (LED lamps) and the like, in particular to a local control method of a household micro-grid energy router energy management unit.
Background
At present, china is in an important stage of rapid development of economy and society, and in the process of realizing industrialization, informatization and town, various challenges such as restriction of environment and resources on human society development are faced; contradiction between energy and environmental and greenhouse gas emissions; balance between resources and energy resources in development and utilization rates, etc. It has been difficult to continue to maintain economic, social health, coordination and sustainable development by means of traditional fossil fuels.
In the present day, the development and utilization of clean and efficient renewable energy sources is a major way to solve the problem of future energy sources. The micro-grid can integrate a large amount of renewable energy sources, fully consume the renewable energy on site, and reduce environmental burden while obtaining economic benefit. Micro-grid technology will become an important driving force for future energy utilization mode change.
The household micro-grid is arranged in such a background environment, and photovoltaic power generation and energy storage equipment is arranged at the user side, so that the consumption of traditional electric energy is reduced, and the duty ratio of renewable energy sources is improved. It is a key to the consumer microgrid technology to find an efficient, stable, and viable energy route management system.
Disclosure of Invention
Aiming at the problems of household integrated energy systems formed by household photovoltaic distributed power generation equipment, lithium battery energy storage equipment and typical household appliances (alternating current and direct current loads such as lighting LED lamps) and the stable operation, cooperative control and the like of the integrated systems, household micro-grid energy router energy management unit equipment is developed, when mains supply fails, the household micro-grid energy router energy management unit equipment locally links with a direct current lighting main control unit DCU, MEMS simple scheduling commands are executed, the most suitable household micro-grid supplies power for direct current lighting LEDs, the main-standby complementation of an alternating current power grid and a household light storage direct current micro-grid is achieved, and novel intelligent lighting uninterrupted power supply is realized. The EMU integrates a singlechip with different operation control strategies, a set of control logic of the user micro-grid in a grid-connected mode, a grid-off mode and a limited mode is provided according to two different users (users with stable commercial power supply and users with unstable commercial power supply), the coordination control of the user micro-grid routing energy management scheduling and the multi-voltage-level sequence AC/DC bus energy flow is realized, the independent safe operation of the user micro-grid under the condition that a background control instruction is not received can be ensured, and the maximum utilization of photovoltaic power generation is finally realized.
Based on the AC/DC hybrid micro-grid with the home-based energy micro-grid energy router as a core, the EMU can monitor the running state of each component in the system, control each converter and switch component in the system, and realize timely alarm of system faults and conversion and switching of running modes.
Aiming at the priority level of photovoltaic power generation, heuristic local control strategies under different working conditions of the EMU are designed, and control logic is provided. The EMU operation control logic is as follows:
and detecting and judging whether the grid side of the grid-connected inverter in the household micro-grid fails, and entering a limited mode if the grid side of the grid-connected inverter fails. And judging whether the micro-grid has grid-connected working conditions or not.
Grid-connected mode:
(1) Judging whether the daytime is carried out, if so, entering (2), otherwise, entering (11);
(2) Judging whether the photovoltaic power is larger than the sum of the alternating current/direct current load and the maximum charging power of the battery, if so, entering (3), otherwise, entering (6);
(3) Judging whether the battery can be charged or not, if so, entering (4), otherwise, entering (5);
(4) The battery is charged according to the maximum allowable power, and the grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power as well as the maximum charging power of the battery;
(5) The grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power, and the battery is not charged or discharged;
(6) Judging whether the photovoltaic power is larger than the load power, if so, entering (7), otherwise, entering (10);
(7) Judging whether the battery can be charged or not, if so, entering (8), otherwise, entering (9);
(8) The grid-connected inverter inverts the internet power to 0, and the battery charging power is the difference value between the photovoltaic power generation power and the load power;
(9) The grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power, and the battery is not charged or discharged;
(10) The grid-connected inverter rectifies and takes the electric power as the difference value between the load power and the photovoltaic power generation power, and the battery is not charged and discharged;
(11) Judging whether the SOC of the battery is larger than 0.2, if so, entering (12), otherwise, entering (15);
(12) Judging whether the maximum discharge power of the battery is larger than the load power, if so, entering (13), otherwise, entering (14);
(13) The grid-connected inverter has the power of 0, no residual electricity exists, and the discharge power of the battery is equal to the load work;
(14) Rectifying and taking the electric power as a difference value between the load power and the maximum discharge power of the battery by the grid-connected inverter, and discharging the battery according to the maximum power;
(15) The grid-connected inverter rectifies the power to be the load power, and the battery is not charged or discharged.
Off-grid mode:
(1) Judging whether the photovoltaic power is larger than the sum of the alternating current/direct current load and the maximum charging power of the battery, if so, entering (2), otherwise, entering (5);
(2) Judging whether the battery can be charged or not, if so, entering (3), otherwise, entering (4);
(3) Setting the output power of the photovoltaic MPPT as the sum of the load power and the maximum allowable charging power of the battery, and charging the battery according to the maximum allowable power;
(4) Setting the photovoltaic MPPT output power as load power, and enabling the battery not to charge or discharge;
(5) Judging whether the photovoltaic power is larger than the load power, if so, entering (6), otherwise, entering (9);
(6) Judging whether the battery can be charged, if so, entering (7), otherwise, entering (8);
(7) The photovoltaic MPPT outputs the maximum power, and the battery is charged according to the difference value of the photovoltaic power generation power and the load power;
(8) Setting the photovoltaic MPPT output power as load power, and enabling the battery not to charge or discharge;
(9) Judging whether the battery can be discharged, if so, entering (10), otherwise, entering (11);
(10) The photovoltaic MPPT outputs the maximum power, and the battery discharge power is the difference value between the load power and the photovoltaic power generation power;
(11) The photovoltaic MPPT outputs the maximum power, the battery is not charged or discharged, and part or all of the load is cut off.
Restricted mode:
(1) Comparing the battery charge states SOC of the three household direct current micro-grids, entering an off-grid mode if the highest value is smaller than 0.2, and entering (2) if the highest value is larger than 0.2;
(2) The switch between the household micro-grid and the direct current illumination LED is closed, and the illumination power is regulated to the minimum value. Judging whether the photovoltaic power is larger than the sum of the load power, the direct-current illumination minimum power and the battery maximum charging power, if so, entering (3), otherwise, entering (6);
(3) Judging whether the battery can be charged, if so, entering (4), otherwise, entering (5);
(4) Setting the output power of the photovoltaic MPPT as the sum of the load power, the direct-current illumination power and the maximum charging power of the battery, and charging the battery according to the maximum power;
(5) Setting the output power of the photovoltaic MPPT as the sum of the load power and the direct-current illumination power, and enabling the battery not to charge or discharge;
(6) Judging whether the photovoltaic power is larger than the sum of the load power and the direct-current illumination power, if so, entering (7), otherwise, entering (10);
(7) Judging whether the battery can be charged, if so, entering (8), otherwise, entering (9);
(8) The photovoltaic MPPT outputs the maximum power, and the battery is charged according to the difference value of the photovoltaic power generation power, the load and the direct current illumination power;
(9) Setting the output power of the photovoltaic MPPT as the sum of the load power and the direct-current illumination power, and enabling the battery not to charge or discharge;
(10) Judging whether the state of charge (SOC) of the battery is larger than 0.2, if so, entering (11), otherwise, entering (12);
(11) The photovoltaic MPPT outputs the maximum power, and the battery discharges according to the difference value between the sum value of the load power and the direct current illumination power and the photovoltaic power generation power;
(12) And (3) switching off a communication switch of the micro-grid for the account and the direct-current illumination, and returning to (1) to judge again.
A local control method of a household micro-grid energy router energy management unit can realize energy management of a plurality of AC/DC buses with different voltage levels for household users, wherein the local control method comprises the steps of photovoltaic DC buses, energy router DC buses, commercial power AC buses and high-voltage monopole type DC feeder buses, so that the micro-grid router needs to finish cooperative control of energy flows among the buses; the household user can stably operate in a grid-connected mode, a grid-off mode and a limited mode and can uninterruptedly supply power to the guaranteed direct-current lighting equipment, and in an operation mode of 'self-power-consumption and residual electricity internet surfing', the in-situ consumption of the distributed power generation is realized to a greater extent.
Drawings
FIG. 1 is a topological structure diagram of an AC/DC hybrid micro-grid energy routing system;
fig. 2 is a flow chart of control logic of a home micro-grid energy routing system.
Detailed Description
Energy Management Unit (EMU) local control techniques are studied. Based on the hybrid AC/DC micro-grid with the energy router of the home-use micro-grid as the core, the EMU integrates a single chip microcomputer with different operation control strategies, a set of control logic of the home-use micro-grid in a grid-connected mode, an off-grid mode and a limited mode is provided according to two different users (users with stable commercial power supply and users with unstable commercial power supply), the coordination control of the routing energy management scheduling of the home-use micro-grid and the energy flow of the AC/DC bus with a multi-voltage-class sequence is realized, the independent safe operation of the home-use micro-grid under the condition that the background control instruction is not received can be ensured, and the maximum utilization of the photovoltaic power generation is finally realized.
In the micro-grid operation management process, the EMU needs to continuously collect and control various variables in the system, and timely switch states and alarm when system conditions are changed or faults occur so as to ensure stable operation of the system. The control variables that need to be monitored for acquisition are as follows:
1. collecting voltages, currents and frequencies of grid-connected sides of three household micro-grid-connected inverters and a centralized cabinet, and judging whether a power grid fails or not;
2. collecting the voltage and current of a direct current bus in three household micro-grid systems, and judging whether the micro-grid meets grid-connected conditions or not;
3. collecting the grid-connected switch states of three household micro-grids, and judging whether grid connection exists or not;
4. collecting power, daily internet power, accumulated internet power, daily power consumption and accumulated power consumption of a grid-connected inverter in a household micro-grid, and acquiring the running state of the grid-connected inverter;
5. collecting AC/DC load power, daily electricity consumption and accumulated electricity consumption in a micro-grid system, and obtaining the load side running state of an energy router;
6. collecting power, state of charge (SOC), battery Health (SOH), temperature, daily charge, daily discharge and accumulated discharge of an energy storage battery in three household microgrid systems, and analyzing the running State of the battery;
7. collecting real-time power generation power, daily power generation amount and accumulated power generation amount of the photovoltaic in the micro-grid system, and analyzing the photovoltaic power generation state;
8. collecting power, daily variable flow, accumulated variable flow and opening and closing states of a linkage switch of a high-voltage converter of the three household micro-grid systems, and acquiring power supply states of an energy router for LEDs;
9. collecting direct-current illumination LED voltage, current, power, daily electricity consumption, accumulated electricity consumption, daily rectification power of a concentrated tank DCU, daily rectification electricity consumption and accumulated rectification electricity consumption, and acquiring an LED running state;
the EMU local control user uses the micro-grid system to connect the on-off of the grid-connected switch, centralize the cabinet and leave the grid, connect the inverter power of the inverter, the inverter power that the AC/DC load is connected with, the photovoltaic power controller;
MEMS and EMU are combined to control the linkage switch and the high-voltage converter.
The AC/DC hybrid micro-grid consists of an AC sub-micro-grid and a DC sub-micro-grid, as shown in FIG. 1, the AC sub-micro-grid consists of a multi-on-line air conditioner, a photovoltaic module and a grid-connected inverter, and the electric quantity generated by the photovoltaic is directly taken from the power grid through the grid-connected inverter and AC loads such as the air conditioner; the DC sub-micro-grid is connected to a 300V unipolar DC feeder line through a high-voltage converter port by three household-level energy routers, the DC feeder line is connected with commercial power and the unipolar DC feeder line through a centralized cabinet, DC illumination is connected to the DC feeder line, the centralized cabinet takes power from a power grid to supply power to the DC illumination LEDs in normal operation, and the LEDs in the best state in the three energy routers are used for supplying power in a limited mode. And each household-level energy router is integrated with a grid-connected inverter, a high-voltage converter, an alternating-current load inverter, an energy storage battery, a direct-current load converter and a photovoltaic power controller. The internal dc bus voltage is 48V, and the energy management unit EMU is used to control the operation state of the microgrid.
Control logic flow diagram of home ubiquitous energy micro-grid energy routing system (figure 2)
The control logic of the energy routing system is a circulation instruction, and the EMU judges the running state of the micro-grid through monitoring and collecting the running state data of each element in the direct-current sub-micro-grid, and controls the energy router by utilizing an internal integrated singlechip, so that the micro-grid can stably run.
Claims (3)
1. A local control method of a household micro-grid energy router energy management unit is characterized by comprising the following steps of: the Energy Management Unit (EMU) integrates singlechips comprising different operation control strategies, provides a set of control logic in a grid-connected mode, an off-grid mode and a limited mode for the user-level micro-grid, realizes the routing energy management scheduling of the user-level micro-grid and the coordination control of the multi-voltage-level sequence AC/DC bus energy flow, can ensure that the user-level micro-grid independently and safely operates under the condition that a background control instruction is not received, and finally realizes the spontaneous self-use of electric energy in the user-level micro-grid and the internet surfing of residual electricity; the Energy Management Unit (EMU) control logic aims at realizing the maximum utilization of photovoltaic power generation, realizing the mode that each household micro-grid system operates in spontaneous self-use and residual electricity surfing, designing heuristic local control strategies under different working conditions of the EMU aiming at the priority level of utilizing the photovoltaic power generation, providing control logic, and the EMU operation control logic is as follows:
grid-connected mode:
(1) Judging whether the daytime is carried out, if so, entering (2), otherwise, entering (11);
(2) Judging whether the photovoltaic power is larger than the sum of the alternating current/direct current load and the maximum charging power of the battery, if so, entering (3), otherwise, entering (6);
(3) Judging whether the battery can be charged or not, if so, entering (4), otherwise, entering (5);
(4) The battery is charged according to the maximum allowable power, and the grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power as well as the maximum charging power of the battery;
(5) The grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power, and the battery is not charged or discharged;
(6) Judging whether the photovoltaic power is larger than the load power, if so, entering (7), otherwise, entering (10);
(7) Judging whether the battery can be charged or not, if so, entering (8), otherwise, entering (9);
(8) The grid-connected inverter inverts the internet power to 0, and the battery charging power is the difference value between the photovoltaic power generation power and the load power;
(9) The grid-connected inverter inverts the internet power to be the difference value between the photovoltaic power generation power and the load power, and the battery is not charged or discharged;
(10) The grid-connected inverter rectifies and takes the electric power as the difference value between the load power and the photovoltaic power generation power, and the battery is not charged and discharged;
(11) Judging whether the SOC of the battery is larger than 0.2, if so, entering (12), otherwise, entering (15);
(12) Judging whether the maximum discharge power of the battery is larger than the load power, if so, entering (13), otherwise, entering (14); (13) The grid-connected inverter has the power of 0, no residual electricity exists, and the discharge power of the battery is equal to the load work;
(13) Rectifying and taking the electric power as a difference value between the load power and the maximum discharge power of the battery by the grid-connected inverter, and discharging the battery according to the maximum power;
(14) The grid-connected inverter rectifies the power to be the load power, and the battery is not charged or discharged;
off-grid mode:
(1) Judging whether the photovoltaic power is larger than the sum of the alternating current/direct current load and the maximum charging power of the battery, if so, entering (2), otherwise, entering (5);
(2) Judging whether the battery can be charged or not, if so, entering (3), otherwise, entering (4);
(3) Setting the output power of the photovoltaic MPPT as the sum of the load power and the maximum allowable charging power of the battery, and charging the battery according to the maximum allowable power;
(4) Setting the photovoltaic MPPT output power as load power, and enabling the battery not to charge or discharge;
(5) Judging whether the photovoltaic power is larger than the load power, if so, entering (6), otherwise, entering (9);
(6) Judging whether the battery can be charged, if so, entering (7), otherwise, entering (8);
(7) The photovoltaic MPPT outputs the maximum power, and the battery is charged according to the difference value of the photovoltaic power generation power and the load power;
(8) Setting the photovoltaic MPPT output power as load power, and enabling the battery not to charge or discharge;
(9) Judging whether the battery can be discharged, if so, entering (10), otherwise, entering (11);
(10) The photovoltaic MPPT outputs the maximum power, and the battery discharge power is the difference value between the load power and the photovoltaic power generation power;
(11) The photovoltaic MPPT outputs the maximum power, the battery is not charged or discharged, and part or all of the load is cut off;
restricted mode:
(1) Comparing the battery charge states SOC of the three household direct current micro-grids, entering an off-grid mode if the highest value is smaller than 0.2, and entering (2) if the highest value is larger than 0.2;
(2) Closing a switch between the household micro-grid and the direct-current illumination LEDs, and adjusting illumination power to the minimum value; judging whether the photovoltaic power is larger than the sum of the load power, the direct-current illumination minimum power and the battery maximum charging power, if so, entering (3), otherwise, entering (6);
(3) Judging whether the battery can be charged, if so, entering (4), otherwise, entering (5);
(4) Setting the output power of the photovoltaic MPPT as the sum of the load power, the direct-current illumination power and the maximum charging power of the battery, and charging the battery according to the maximum power;
(5) Setting the output power of the photovoltaic MPPT as the sum of the load power and the direct-current illumination power, and enabling the battery not to charge or discharge;
(6) Judging whether the photovoltaic power is larger than the sum of the load power and the direct-current illumination power, if so, entering (7), otherwise, entering (10);
(7) Judging whether the battery can be charged, if so, entering (8), otherwise, entering (9);
(8) The photovoltaic MPPT outputs the maximum power, and the battery is charged according to the difference value of the photovoltaic power generation power, the load and the direct current illumination power;
(9) Setting the output power of the photovoltaic MPPT as the sum of the load power and the direct-current illumination power, and enabling the battery not to charge or discharge;
(10) Judging whether the state of charge (SOC) of the battery is larger than 0.2, if so, entering (11), otherwise, entering (12);
(11) The photovoltaic MPPT outputs the maximum power, and the battery discharges according to the difference value between the sum value of the load power and the direct current illumination power and the photovoltaic power generation power;
(12) And (3) switching off a communication switch of the micro-grid for the account and the direct-current illumination, and returning to (1) to judge again.
2. The local control method of a home micro-grid energy router energy management unit of claim 1, wherein: under the limited mode, after the commercial power fails, the EMU is locally linked with the direct-current lighting main control unit DCU, the MEMS simple scheduling command is executed, the direct-current lighting LEDs are powered for the household micro-grid, the main-standby complementation of the alternating-current power grid and the household optical storage direct-current micro-grid is achieved, and the novel intelligent lighting uninterrupted power supply is realized.
3. The local control method of a home micro-grid energy router energy management unit of claim 1, wherein: in an AC/DC hybrid micro-grid based on a home-based energy micro-grid energy router as a core, an EMU can monitor the running state of each component in a system, control each converter and switch component in the system, and realize timely alarm of system faults and conversion and switching of running modes.
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| CN112994057B (en) * | 2021-02-05 | 2022-11-22 | 中国科学院电工研究所 | Economic operation control method of modular energy router system |
| CN113794247B (en) * | 2021-09-06 | 2024-04-05 | 国网山东省电力公司枣庄供电公司 | Automatic demand-responsive regulated power storage control |
| CN116865340B (en) * | 2023-07-19 | 2024-04-05 | 青岛鼎信通讯科技有限公司 | Photovoltaic charging station based on energy router and MPPT and anti-backflow method thereof |
| CN117595223B (en) * | 2024-01-18 | 2024-04-12 | 国网山东省电力公司莱芜供电公司 | Power distribution system based on AC/DC micro-grid |
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