CN105978025A - Microgrid management system - Google Patents
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- CN105978025A CN105978025A CN201610395832.7A CN201610395832A CN105978025A CN 105978025 A CN105978025 A CN 105978025A CN 201610395832 A CN201610395832 A CN 201610395832A CN 105978025 A CN105978025 A CN 105978025A
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- 238000004146 energy storage Methods 0.000 claims abstract description 49
- 238000011217 control strategy Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241001672018 Cercomela melanura Species 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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Classifications
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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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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a microgrid management system, comprising a region management system, at least one power distribution device and a node management system integrated in the power distribution device. The power distribution device comprises a grid-connected system branch connected to a big power grid, a microgrid branch connected to the microgrid and a load branch connected to a load; all branches are connected to a microgrid bus in the power distribution device; the region management system utilizes a region management strategy to calculate electric energy information of each branch which is uploaded on the node management system or obtains a node control order according to a scheduling order inputted by the user; the node management system collects electric energy information of various branches, utilizes the node management strategy to calculate the electric energy information or obtains a branch control order according to the node control order, and respectively controls each of the branches in the power distribution device according to the branch control order. The microgrid management system reasonably controls and coordinates power flow among the power grid, a distributed power supply, an energy storage system and the load, and guarantees safe, stable and reliable operation of the system.
Description
Technical Field
The invention relates to the technical field of micro-grid application. And more particularly, to a microgrid management system.
Background
The renewable power source is vigorously popularized and applied by countries in the world as a new energy source, but the renewable energy source has randomness and volatility, large-scale access also causes huge impact on a power grid, and the micro-grid system has certain adjusting capacity, so that the impact of the renewable energy source on the power grid can be weakened, the access proportion of the renewable energy source is improved, and the diversified requirements of users on electric energy can be met. At present, theoretical research results of the micro-grid technology are more, but the engineering application research aiming at the management system related to the micro-grid is less, so that the micro-grid technology is difficult to instantiate, popularize and popularize.
Therefore, it is desirable to provide a microgrid management system.
Disclosure of Invention
The invention aims to provide an efficient microgrid management system which is reasonable in design, beneficial to capacity expansion and convenient for engineering application.
In order to achieve the purpose, the invention adopts the following technical scheme:
a microgrid management system comprising: the system comprises a regional management system, at least one power distribution device and a node management system integrated in the power distribution device;
the distribution device comprises a grid-connected system branch connected with a large power grid, a micro-grid branch connected with a micro-grid and a load branch connected with a load, wherein the grid-connected system branch, the micro-grid branch and the load branch are all connected to a micro-grid alternating current bus in the distribution device;
the regional management system calculates the electric energy information of each branch uploaded by the node management system by using a regional management strategy to obtain a node control instruction or obtains the node control instruction according to a scheduling instruction input by a user;
and the node management system is used for acquiring the electric energy information of each branch, calculating the electric energy information by using a node management strategy to obtain a branch control instruction or obtaining a branch control instruction according to the node control instruction, and respectively controlling each branch in the distribution device according to the branch control instruction.
Preferably, the microgrid branches include a photovoltaic system branch connected with a photovoltaic system, a diesel generator branch connected with a diesel generator and an energy storage system branch connected with an energy storage system, the load branches include an important load branch connected with an important load and a general load branch connected with a general load, and the photovoltaic system branch, the energy storage system branch, the diesel generator branch, the grid-connected system branch, the important load branch and the general load branch are all connected to a microgrid alternating-current bus in the power distribution device.
Preferably, a current sensor, a contactor and a circuit breaker are connected between the external connection port of each branch and the microgrid alternating current bus in sequence.
Preferably, the microgrid management system further comprises a UPS for providing auxiliary power for the power distribution device, the photovoltaic system and the diesel generator.
Preferably, the contactor of the photovoltaic system branch and the contactor of the grid-connected system branch are also respectively connected with a lightning protection device.
Preferably, the node management system includes: the system comprises an electric energy acquisition unit, an I/O control unit and a node controller;
the node controller issues an acquisition instruction and an I/O control instruction;
the electric energy acquisition unit is used for respectively acquiring secondary side signals of the current sensors of each branch according to the acquisition instruction and calculating electric energy information of each branch;
the I/O control unit controls the contactors in each branch according to an I/O control instruction sent by the node controller;
and the node controller calculates the electric energy information of each branch by using a node management strategy to obtain a branch control instruction or obtains a branch control instruction according to the node control instruction, and respectively controls a grid-connected system branch, a photovoltaic system branch, a diesel generator branch, an energy storage system branch, an important load branch and a general load branch in the distribution device according to the control instruction.
Preferably, the power information includes voltage, current, active power, reactive power, apparent power, forward power, and reverse power.
Preferably, the power distribution device further comprises a radiator and a heater, and the radiator and the heater are started and stopped according to the internal temperature of the power distribution device.
Preferably, the node management system respectively controls the control strategy of each branch in the distribution device according to the branch control instruction as follows:
the node management system detects the voltages in front of and behind the grid-connected branch contactor in real time;
when the large power grid loses power, the node management system disconnects a contactor of a grid-connected system branch, the energy storage converter works according to a voltage source mode, the photovoltaic system and the diesel generator operate according to a grid-connected mode, and when the electric energy output by the photovoltaic system can meet the requirement of a load, the load acquires the electric energy output by the photovoltaic system on a micro-grid alternating current bus; when the electric energy output by the photovoltaic system cannot meet the requirement of the load, the energy storage system outputs the electric energy if the electric energy storage system has electric energy storage, and when the electric energy storage of the energy storage system reaches a set lower limit, the diesel generator is started to output the electric energy to ensure that the load normally works, wherein the load comprises an important load and a common load;
when the large power grid is recovered from the power loss state to be normal, the energy storage system detects the voltage of the large power grid outside the grid-connected branch, then adjusts the output grid voltage of the energy storage system to be synchronous, and when the amplitude, the frequency and the phase of the output voltage of the energy storage system are the same as the amplitude, the frequency and the phase of the voltage of the power grid, the node management system closes a contactor of the grid-connected branch.
Preferably, the step of the node management system respectively controlling the control policy of each branch in the power distribution apparatus according to the branch control instruction further includes: when the diesel generator is started to output electric energy, important load operation is preferentially maintained
The invention has the following beneficial effects:
the technical scheme of the invention provides a stable and reliable realization interface for micro-grid construction, the micro-grid can be quickly constructed and used by configuring a distributed power supply, the power flow among the power grid, the distributed power supply, an energy storage system and a load is reasonably controlled and coordinated by an energy dispatching management system, the system is ensured to run safely, stably and reliably, diversified power consumption requirements are met, and meanwhile, the system income is increased according to an economic dispatching target, and the invention has the following beneficial effects:
(1) the system is provided with various distributed power supply access ports and is applied in a diversified manner;
(2) a plurality of node management systems can be accessed under the area management system, so that the capacity expansion is convenient;
(3) the energy dispatching management system has a flexible energy dispatching management function, and can realize the functions of renewable energy power fluctuation suppression, peak clipping and valley filling, planned isolated island and the like;
(4) the load is controlled in a grading way, and the power supply of important loads is preferentially ensured according to the capacity of the energy storage battery; the load power supply time and the power supply mode can be automatically optimized or set by a user.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a microgrid management system.
Fig. 2 shows a communication topology diagram of a microgrid management system.
Fig. 3 shows a schematic diagram of a node management system.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The microgrid management system provided by the embodiment is applied to a 400V microgrid, as shown in fig. 1, the system comprises an area management system, at least one power distribution device and a node management system integrated in the power distribution device,
the region management system and the node management system jointly form an energy management system, the region management system is used as a father node in the energy management system, receives user monitoring and scheduling, realizes the uppermost layer scheduling control, can realize the scheduling strategy of the whole system, reasonably adjusts the node management systems below and jointly realizes the scheduling target; the node management system is used as a child node in the energy management system to receive the monitoring and scheduling of a father node, and is only responsible for energy balance between a microgrid connected with a large power grid and a power distribution device to which the node management system belongs and loads, so as to assist the regional management system in completing scheduling control.
At least one emergency control strategy is preset in the node management system, and the priority of each strategy can be set if a plurality of emergency control strategies exist. When the regional management system breaks down, the node management system can independently operate according to a preset emergency control strategy, and the power distribution device where the node management system is located can be guaranteed to stably and orderly operate.
The parent node can be provided with a plurality of child nodes, namely, the area management system can monitor and schedule a plurality of node management systems, and the node management systems can be added into the area micro-grid system when meeting the area management system scheduling strategy and the interface protocol.
The regional management system and the node management system have respective energy scheduling management strategies, the regional management strategies of the regional management system focus on energy management between a large power grid and a load connected with a power distribution device, and comprise a grid-connected point voltage and frequency regulation strategy, a peak-clipping and valley-filling strategy, a driving/passive island strategy and the like; the node management strategy of the node management system focuses on energy management between the microgrid connected with the power distribution device and the load, and includes, for example, a power self-balancing strategy, a voltage self-adapting strategy, a black start strategy and the like in the power distribution device.
The distribution device comprises a grid-connected system branch connected with a large power grid, a micro-grid branch connected with a micro-grid and a load branch connected with a load, wherein the grid-connected system branch, the micro-grid branch and the load branch are all connected to a micro-grid alternating current bus in the distribution device;
the regional management system calculates the electric energy information of each branch uploaded by the node management system by using a regional management strategy to obtain a node control instruction or obtains the node control instruction according to a scheduling instruction input by a user;
the node management system acquires the electric energy information of each branch, calculates the electric energy information by using a node management strategy to obtain branch control instructions or obtains branch control instructions according to the node control instructions, and controls each branch in the power distribution device according to the branch control instructions, so that the node management system controls each branch or the regional management system controls each branch through the node management system, and energy balance among a large power grid, a micro power grid and a load is coordinated.
Wherein,
the microgrid comprises a photovoltaic system, a diesel generator and an energy storage system, wherein the photovoltaic system and the diesel generator both belong to a distributed power supply, the microgrid branches comprise photovoltaic system branches connected with the photovoltaic system, diesel generator branches connected with the diesel generator and energy storage system branches connected with the energy storage system, the loads comprise important loads and general loads, the load branches comprise important load branches connected with the important loads and general load branches connected with the general loads, and the photovoltaic system branches, the energy storage system branches, the diesel generator branches, grid-connected system branches, the important load branches and the general load branches are all connected into a microgrid alternating current bus in the power distribution device.
The construction of the microgrid management system is further explained below:
a current sensor, a contactor and a circuit breaker are sequentially connected between an external connection port of each branch (for example, a port of a photovoltaic system branch connected with a photovoltaic system) in the power distribution device and a microgrid alternating current bus.
The circuit breakers and contactors in each branch of the power distribution apparatus are all equipped with contact feedback.
The power distribution device is provided with a UPS and provides an auxiliary power supply for the power distribution device and a distributed power generation system, and the distributed power generation system comprises a photovoltaic system and a diesel generator.
The contactor of the photovoltaic system branch and the contactor of the grid-connected system branch in the distribution device are also respectively connected with a lightning protection device.
The contactors and circuit breakers of all branches in the power distribution device are all fixedly arranged in the power distribution device through bolts, the states of the contactors and the circuit breakers are indicated through branch state indicating lamps arranged on a panel of the power distribution device, and the working voltage of the indicating lamps is obtained from the UPS.
The power distribution device is provided with a radiator and a heater, and the radiator and the heater are started and stopped according to the internal temperature of the power distribution device. When the internal temperature of the power distribution device is higher than the set maximum temperature (generally set to 35-40 ℃), the cooling fan is started; when the internal temperature of the power distribution device is lower than the set maximum temperature, the heat dissipation fan stops. When the internal temperature of the power distribution device is lower than the set minimum temperature (usually set to 0-5 ℃), the heater is started; when the internal temperature of the power distribution device is higher than the set minimum temperature, the heater is stopped. The radiator and the heater ensure that the internal temperature of the power distribution device meets the requirements of all devices.
The area management system mainly collects data information of the node control system in real time through the area server, a user can read the server information through the monitoring workstation, check the operation condition of the system, and simultaneously can issue a node control instruction to the node management system through the area management system.
As shown in fig. 2, the communication architecture of the microgrid management system provided in this embodiment is divided into three layers: device layer, node layer, regional layer. The device layer and the node layer realize communication between the six branches and the node management system, and the communication mode is RS485, RS232, CAN, power line carrier or wireless communication and the like; the node layer and the area layer realize the communication between the node management system and the area management system, and the communication mode is Ethernet communication.
As shown in fig. 3, the node management system includes: an electric energy acquisition unit, an I/O control unit and a node controller,
the electric energy acquisition unit is used for respectively acquiring secondary side signals of the current sensors of each branch according to an acquisition instruction sent by the node controller and calculating electric energy information of each branch, wherein the electric energy information comprises voltage, current, active power, reactive power, apparent power, forward electric energy and reverse electric energy of the branch;
the I/O control unit controls the contactors in each branch according to an I/O control instruction sent by the node controller;
the node controller issues an acquisition instruction and an I/O control instruction, calculates electric energy information by using a node management strategy to obtain a branch control instruction or obtains a branch control instruction according to the node control instruction, and respectively controls a grid-connected system branch, a photovoltaic system branch, a diesel generator branch, an energy storage system branch, an important load branch and a general load branch in the power distribution device according to the control instruction so as to coordinate energy balance among a large power grid, a micro power grid and loads.
When the microgrid management system provided in this embodiment works, a scheduling policy of the entire system (i.e., a control policy in which the node management system controls each branch in the power distribution apparatus according to the branch control instruction) is as follows:
the node management system detects the voltage in front of and behind the grid-connected branch contactor in real time,
when the large power grid loses power, the node management system disconnects the contactor of the grid-connected system branch, the energy storage converter works according to a voltage source mode, stable frequency and voltage support is provided for the micro power grid system, the photovoltaic system and the diesel generator still run according to the grid-connected mode, (the two run modes are the same as the power grid when the power grid has power, but the voltage is established by the energy storage converter), because the photovoltaic system branch, the diesel generator branch, the energy storage system branch and the load branch in the power distribution device are connected to an alternating current bus in parallel, the photovoltaic system, the diesel generator and the energy storage system can all output electric energy, and then: when the electric energy output by the photovoltaic system can meet the requirements of loads (including important loads and common loads), the diesel generator and the energy storage system do not output the electric energy, and the loads directly obtain the electric energy output by the photovoltaic system on a bus; when the electric energy output by the photovoltaic system cannot meet the requirement of the load, the energy storage system outputs the electric energy if the electric energy is stored, and the electric energy and the photovoltaic system maintain the load operation together; when the electric energy storage of the energy storage system reaches the set lower limit, the diesel generator is started to output electric energy, and the load is ensured to work normally when the large power grid loses power. When the diesel generator is started to output electric energy, important loads are preferentially maintained to operate, and the important loads are firstly ensured to normally work.
When the large power grid is recovered from the power failure state to be normal, the energy storage system detects the voltage of the large power grid outside the grid-connected branch, then adjusts the output grid voltage of the energy storage system to be synchronous, and when the amplitude, the frequency and the phase of the output voltage of the energy storage system are the same as the amplitude, the frequency and the phase of the voltage of the power grid, the node management system closes the contactor of the grid-connected branch, so that the function of converting the micro-grid system from the off-grid state to the grid-connected.
The energy storage converter of the energy storage system is provided with two groups of voltage sensors, one group of voltage sensors normally participates in self operation control, and the measured voltage position is the position of self alternating current output; the other group of voltage sensors samples the voltage of the grid-connected point switch, namely the voltage of the power grid, and the voltage sampling line is actually required to be connected to the inside of the energy storage converter on site.
The power distribution device is provided with double load branches, namely, the load is divided into an important load and a common load, the important load branch connected with the important load and the common load branch connected with the common load are respectively arranged, and the load can be sequentially connected according to the importance degree of the load. In the node management system, the power supply time for preferentially ensuring important loads can be set, and the node management system can decide whether to cut off or put into a common load according to the capacity of the energy storage system.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A microgrid management system, characterized in that the system comprises: the system comprises a regional management system, at least one power distribution device and a node management system integrated in the power distribution device;
the distribution device comprises a grid-connected system branch connected with a large power grid, a micro-grid branch connected with a micro-grid and a load branch connected with a load, wherein the grid-connected system branch, the micro-grid branch and the load branch are all connected to a micro-grid alternating current bus in the distribution device;
the regional management system calculates the electric energy information of each branch uploaded by the node management system by using a regional management strategy to obtain a node control instruction or obtains the node control instruction according to a scheduling instruction input by a user;
and the node management system is used for acquiring the electric energy information of each branch, calculating the electric energy information by using a node management strategy to obtain a branch control instruction or obtaining a branch control instruction according to the node control instruction, and respectively controlling each branch in the distribution device according to the branch control instruction.
2. The microgrid management system of claim 1, wherein the microgrid branches comprise a photovoltaic system branch connected with a photovoltaic system, a diesel generator branch connected with a diesel generator and an energy storage system branch connected with an energy storage system, the load branches comprise an important load branch connected with an important load and a general load branch connected with a general load, and the photovoltaic system branch, the energy storage system branch, the diesel generator branch, the grid-connected system branch, the important load branch and the general load branch are all connected to a microgrid alternating-current bus in a distribution device.
3. The microgrid management system of claim 2, wherein a current sensor, a contactor and a circuit breaker are connected between the external connection port of each branch and the microgrid alternating current bus in sequence.
4. The microgrid management system of claim 2 further comprising a UPS providing auxiliary power for the power distribution devices, the photovoltaic system and the diesel generators.
5. The microgrid management system of claim 3, wherein the contactors of the photovoltaic system branches and the contactors of the grid-connected system branches are further connected with lightning protection devices respectively.
6. The microgrid management system of claim 3, wherein the node management system comprises: the system comprises an electric energy acquisition unit, an I/O control unit and a node controller;
the node controller issues an acquisition instruction and an I/O control instruction;
the electric energy acquisition unit is used for respectively acquiring secondary side signals of the current sensors of each branch according to the acquisition instruction and calculating electric energy information of each branch;
the I/O control unit controls the contactors in each branch according to an I/O control instruction sent by the node controller;
and the node controller calculates the electric energy information of each branch by using a node management strategy to obtain a branch control instruction or obtains a branch control instruction according to the node control instruction, and respectively controls a grid-connected system branch, a photovoltaic system branch, a diesel generator branch, an energy storage system branch, an important load branch and a general load branch in the distribution device according to the control instruction.
7. The microgrid management system of claim 6, wherein the electrical energy information comprises voltage, current, active power, reactive power, apparent power, forward electrical energy and reverse electrical energy.
8. The microgrid management system of claim 1, wherein the power distribution device further comprises a heat sink and a heater, the heat sink and the heater being started and stopped according to an internal temperature of the power distribution device.
9. The microgrid management system of any of claims 3-7, wherein the control policies for controlling the branches of the distribution devices according to the branch control instructions by the node management system are:
the node management system detects the voltages in front of and behind the grid-connected branch contactor in real time;
when the large power grid loses power, the node management system disconnects a contactor of a grid-connected system branch, the energy storage converter works according to a voltage source mode, the photovoltaic system and the diesel generator operate according to a grid-connected mode, and when the electric energy output by the photovoltaic system can meet the requirement of a load, the load acquires the electric energy output by the photovoltaic system on a micro-grid alternating current bus; when the electric energy output by the photovoltaic system cannot meet the requirement of the load, the energy storage system outputs the electric energy if the electric energy storage system has electric energy storage, and when the electric energy storage of the energy storage system reaches a set lower limit, the diesel generator is started to output the electric energy to ensure that the load normally works, wherein the load comprises an important load and a common load;
when the large power grid is recovered from the power loss state to be normal, the energy storage system detects the voltage of the large power grid outside the grid-connected branch, then adjusts the output grid voltage of the energy storage system to be synchronous, and when the amplitude, the frequency and the phase of the output voltage of the energy storage system are the same as the amplitude, the frequency and the phase of the voltage of the power grid, the node management system closes a contactor of the grid-connected branch.
10. The microgrid management system of claim 9, wherein the node management system controls the control strategy of each branch in the distribution device according to the branch control command further comprises: when the diesel generator is started to output electric energy, important load operation is preferentially maintained.
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| CN108183485A (en) * | 2017-12-27 | 2018-06-19 | 阳光电源股份有限公司 | A kind of micro-capacitance sensor and its control system and control method |
| CN108306336A (en) * | 2018-04-10 | 2018-07-20 | 武汉市华和智联科技有限公司 | A kind of power distribution network regulation device and method towards electric vehicle and wind light generation |
| CN109167381A (en) * | 2018-08-01 | 2019-01-08 | 中国电力科学研究院有限公司 | A kind of microgrid control method and topological structure |
| CN111541251A (en) * | 2020-04-28 | 2020-08-14 | 国家计算机网络与信息安全管理中心 | Power distribution method and system for micro bus power supply system of data machine room |
| CN111541251B (en) * | 2020-04-28 | 2021-11-02 | 国家计算机网络与信息安全管理中心 | Power distribution method and system for micro bus power supply system of data machine room |
| CN111707879A (en) * | 2020-05-14 | 2020-09-25 | 上海二十冶建设有限公司 | Method for carrying out grid-connected phase checking on generator by using dual-power online phase checking detection device |
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