CN116154974A - Micro-grid monitoring system for electric micro-grid - Google Patents
Micro-grid monitoring system for electric micro-grid 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention relates to the technical field of power control, in particular to a micro-grid monitoring system for an electric micro-grid, which comprises a micro-grid electric system, a mains supply connection unit and a control system, wherein the micro-grid electric system comprises two or more distributed power generation units, an energy storage unit, a power generation environment detection unit, a power consumption module and a central control module, and the control system can judge whether the micro-grid electric system is connected with the mains supply according to the power generation capacity of the distributed power generation units, the trend of the change of the power storage quantity in the energy storage unit and the power quantity stored in the energy storage unit. According to the invention, through the trend of the change of the electricity storage quantity in the energy storage unit and the adjustment of the moment of connecting or disconnecting the utility network according to the change trend, the timeliness of connecting or disconnecting the utility power is ensured, the use of the power consumption module is not affected by insufficient power supply, the surplus generated energy of the distributed generation unit is not wasted, and the stability of the internal power supply of the micro-grid is ensured.
Description
Technical Field
The invention relates to the technical field of power control, in particular to a micro-grid monitoring system for an electric micro-grid.
Background
The micro-grid refers to a small-sized power distribution and utilization system consisting of a distributed power supply, a power load, a power distribution facility, a monitoring and protecting device and the like. It can be integrated into external power grid operation or can be operated in isolation. The micro-grid has complete power generation and distribution functions, and is an autonomous system capable of realizing self-control, self-protection and energy management. The power supply is mainly used for generating power by local renewable energy sources or is a power generation type which aims at comprehensively utilizing energy sources such as natural gas multi-supply and the like, and novel cleaning technologies such as fuel cells and the like are encouraged to be adopted. The micro-grid is internally provided with a control system for guaranteeing independent operation of load electricity utilization and electrical equipment, has power supply and demand self-balancing operation and black start capability, and can guarantee continuous power supply of important loads during independent operation. The annual exchange power of the micro-grid with the external grid is typically no more than 50% of the annual power consumption. The exchange power and the exchange period of the micro-grid and the external grid are controllable, and the micro-grid and the external grid can realize bidirectional services such as standby, peak shaving, demand side response and the like with the integrated grid, so that the power quality requirements of users are met, friendly interaction with the integrated grid is realized, and energy is used for the users in a friendly way.
Chinese patent publication No.: CN104283308A discloses a micro-grid intelligent central policy control system, comprising: a micro-grid electrical system and a micro-grid policy control system, wherein the micro-grid electrical system comprises: the system comprises a distributed power generation unit, an energy storage unit, an environment monitoring unit, an analog load unit, an actual load unit, a communication network unit and a central strategy control unit; a microgrid policy control system comprising: the information acquisition unit and the central control processing unit.
The power supply capacity of the micro-grid is often subjected to surplus and insufficient phenomena due to the environmental influence of the distributed power generation units, so that the micro-grid is required to be interacted with external power, in the prior art, in the process of interaction between the micro-grid and the external power, the interaction threshold is often only set, the phenomenon of advancing or delaying interaction time is caused, and the internal power supply of the micro-grid is unstable.
Disclosure of Invention
Therefore, the invention provides a micro-grid monitoring system for an electric micro-grid, which is used for solving the problem of unstable power supply inside the micro-grid caused by the phenomenon that the interaction time is advanced or delayed in the process of interaction between the micro-grid and external power in the prior art.
To achieve the above object, the present invention provides a micro grid monitoring system for an electrical micro grid, comprising,
a micro-grid electrical system comprises two or more distributed power generation units, an energy storage unit, a power generation environment detection unit, a power consumption module and a central control module, wherein,
the distributed power generation unit is used for generating power;
the power generation environment detection unit is used for detecting environment information of the distributed power generation units;
the energy storage unit is respectively connected with the distributed power generation unit and the power consumption module, and is used for storing the electric quantity produced by the distributed power generation unit and supplying energy to the power consumption module;
the central control module is respectively connected with the distributed power generation unit, the energy storage unit, the power generation environment detection unit and the power consumption module, and is used for evaluating the power generation capacity of the distributed power generation unit, acquiring the power storage capacity in the energy storage unit, storing historical power consumption data of the power consumption module in the central control module, and estimating the power consumption of the power consumption module per unit time according to the historical power consumption data;
the mains supply connection unit is respectively connected with the energy storage unit, the power consumption module and the mains supply network, and can supplement power to the micro-grid electrical system or recover interference power of the micro-grid electrical system to the mains supply network through the mains supply;
the control system is respectively connected with the micro-grid electrical system and the commercial power connection unit, can judge the power generation capacity of the distributed power generation unit according to the data detected by the power generation environment detection unit, can acquire the trend of the change of the power storage quantity in the energy storage unit in real time, judges whether the commercial power network is connected according to the power generation capacity, the trend of the change of the power storage quantity in the energy storage unit and the power stored in the energy storage unit, and adjusts the time for connecting or disconnecting the commercial power network according to the trend of the change of the power storage quantity in the energy storage unit.
Further, the number of the power generation environment detection units is the same as the number of the distributed power generation units, and the power generation environment detection units are in one-to-one correspondence with the distributed power generation units;
the control system numbers the power generation environment detection units and the distributed power generation units and marks the power generation environment detection units as a first power generation environment detection unit, a second power generation environment detection unit, a first distributed power generation unit, a second distributed power generation unit and an nth power generation environment detection unit respectively;
the first power generation environment detection unit detects the power generation environment of the first distributed power generation unit and transmits a detection result to the central control module, the second power generation environment detection unit detects the power generation environment of the second distributed power generation unit and transmits a detection result to the central control module, and the nth power generation environment detection unit detects the power generation environment of the nth distributed power generation unit and transmits a detection result to the central control module;
and the central control module evaluates the unit-time generated energy of the corresponding distributed power generation units according to the power generation environment detection units, integrates the unit-time generated energy of all the evaluated distributed power generation units, and evaluates the current unit-time generated energy of the micro-grid electrical system.
Further, the power consumption module records the power consumption capacity of the current period, and the central control module analyzes the power consumption module according to the current power consumption capacity of the power consumption module and the historical contemporaneous power consumption data to estimate the power consumption of the power consumption module in unit time;
the central control module acquires the stored electric quantity of the energy storage unit, integrates the stored electric quantity and the generated energy in unit time, compares the integrated result with the estimated power consumption of the power consumption module in unit time, transmits the comparison result to the control system, and the control system judges whether the commercial power is introduced.
Further, if the integration result is larger than the estimated power consumption of the power consumption module in unit time, the control system judges that the mains supply is not required to be introduced;
if the integration result is smaller than or equal to the estimated power consumption of the power consumption module in unit time, the control system judges that the commercial power needs to be introduced;
when the central control module judges that the commercial power needs to be introduced, the control system controls the commercial power connecting unit to connect the commercial power network and the power consumption module.
Further, when the commercial power is introduced, each power generation environment detection unit detects the power generation environment of the corresponding distributed power generation unit in real time and transmits the detection result to the central control module, and the central control module evaluates the power generation amount of the next unit time again according to the acquired data information;
the central control module compares the actual power consumption of the power consumption module in unit time with the estimated power consumption of the power consumption module in unit time and adjusts the estimated power consumption of the next unit time;
the control system is internally provided with a minimum threshold value of electricity storage quantity required by disconnecting the mains supply;
when the power generation amount in the next unit time is larger than the estimated power consumption in the next unit time and the power quantity stored in the energy storage unit is larger than the minimum threshold value of the power storage quantity required by disconnecting the mains supply, the control system controls the mains supply connection unit to disconnect the mains supply from the power consumption module.
Further, the value of the lowest threshold value of the electricity storage quantity required for disconnecting the mains supply is related to the slope of the electricity storage quantity stored in the energy storage unit when the electricity storage quantity is increased, and the larger the slope is, the smaller the value of the lowest threshold value is.
Further, the central control module acquires the electricity storage amount of the energy storage unit in real time when the energy storage unit is not connected with the commercial power network, a electricity storage amount feedback evaluation value is arranged in the control system, and if the electricity storage amount of the energy storage unit is larger than the electricity storage amount feedback evaluation value, the control system sends an instruction to the commercial power connection unit, connects the energy storage unit with the commercial power network, and feeds back the electricity generated by the distributed generation unit to the commercial power network.
Further, the central control module obtains the electricity storage quantity of the energy storage unit in real time when feeding back the electricity quantity to the commercial power network, and if the electricity storage quantity of the energy storage unit is smaller than the electricity storage quantity feedback evaluation value, the control system sends an instruction to the commercial power connection unit to disconnect the energy storage unit from the commercial power network.
Further, the value of the stored electricity amount feedback evaluation value is related to the slope when the stored electricity amount in the energy storage unit is increased or decreased,
when the stored electric quantity in the energy storage unit is increased, the larger the slope is, the smaller the value of the feedback evaluation value of the stored electric quantity is;
when the stored electric quantity in the energy storage unit is decreased, the smaller the slope is, the larger the value of the feedback evaluation value of the stored electric quantity is.
Further, the kinds of the distributed power generation units include a hydroelectric power generation unit, a thermal power generation unit, a wind power generation unit, a solar power generation unit, and a tidal power generation unit, wherein,
the data detected by the power generation environment detection unit corresponding to the water conservancy power generation unit are water level drop and water flow;
the data detected by the power generation environment detection unit corresponding to the thermal power generation unit is heat generated by combustion;
the data detected by the power generation environment detection unit corresponding to the wind power generation unit is the wind speed of the environment;
the data detected by the power generation environment detection unit corresponding to the solar power generation unit are illumination intensity and angle;
the data detected by the power generation environment detection unit corresponding to the tidal power generation unit is the water storage capacity in the tide rising state.
Compared with the prior art, the invention has the beneficial effects that the timeliness of switching on and off the mains supply is ensured by changing the trend of the electricity storage quantity in the energy storage unit and adjusting the time of connecting or disconnecting the mains supply according to the changing trend, the use of the power consumption module is not influenced by insufficient power supply, the surplus generated energy of the distributed generation unit is not wasted, and the stability of the internal power supply of the micro-grid is ensured.
Further, the power consumption in the next unit time is evaluated through the historical power consumption data and the real-time power consumption, so that the accuracy of an evaluation power consumption result is guaranteed, the timeliness of switching in and switching out the mains supply is guaranteed, and the stability of power supply inside the micro-grid is further guaranteed.
Further, the larger the increasing slope of the electricity storage quantity is, the larger the electricity generation capacity in the current time period is, and the lowest threshold value of the electricity storage quantity required by the breaking of the mains supply is properly reduced at the moment, so that excessive electricity generation is prevented, the waste of electric power resources is avoided, and the stability of power supply in the micro-grid is ensured.
Further, when the electricity generation amount reaches a certain value, the generated electricity is fed back to the electric power system, so that the electricity generation is not wasted while the stability of power supply in the micro-grid is ensured.
Further, the larger the incremental gradient of the electricity storage quantity is, the larger the electricity generation capacity in the current time period is, the numerical value of the electricity storage quantity feedback evaluation value is properly reduced at the moment, the stability of power supply in the micro-grid is ensured, and meanwhile, excessive electricity generation and waste of electric power resources are prevented. The smaller the decreasing slope of the electricity storage quantity is, the generated electricity quantity is insufficient to feed back the utility network when the operation of the electricity consumption module is maintained, and the value of the electricity storage quantity feedback evaluation value is properly increased at the moment, so that the stability of power supply inside the micro-grid is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a micro-grid monitoring system for an electrical micro-grid according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electrical system of a micro-grid according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a micro-grid monitoring system for an electrical micro-grid according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an electrical system of a micro-grid according to an embodiment of the present invention.
A micro-grid monitoring system for an electrical micro-grid, comprising,
a micro-grid electrical system comprises two or more distributed power generation units, an energy storage unit, a power generation environment detection unit, a power consumption module and a central control module, wherein,
the distributed power generation unit is used for generating power;
the power generation environment detection unit is used for detecting environment information of the distributed power generation units;
the energy storage unit is respectively connected with the distributed power generation unit and the power consumption module, and is used for storing the electric quantity produced by the distributed power generation unit and supplying energy to the power consumption module;
the central control module is respectively connected with the distributed power generation unit, the energy storage unit, the power generation environment detection unit and the power consumption module, and is used for evaluating the power generation capacity of the distributed power generation unit, acquiring the power storage capacity in the energy storage unit, storing historical power consumption data of the power consumption module in the central control module, and estimating the power consumption of the power consumption module per unit time according to the historical power consumption data;
the mains supply connection unit is respectively connected with the energy storage unit, the power consumption module and the mains supply network, and can supplement power to the micro-grid electrical system or recover interference power of the micro-grid electrical system to the mains supply network through the mains supply;
the control system is respectively connected with the micro-grid electrical system and the commercial power connection unit, can judge the power generation capacity of the distributed power generation unit according to the data detected by the power generation environment detection unit, can acquire the trend of the change of the power storage quantity in the energy storage unit in real time, judges whether the commercial power network is connected according to the power generation capacity, the trend of the change of the power storage quantity in the energy storage unit and the power stored in the energy storage unit, and adjusts the time for connecting or disconnecting the commercial power network according to the trend of the change of the power storage quantity in the energy storage unit.
According to the invention, through the trend of the change of the electricity storage quantity in the energy storage unit and the adjustment of the moment of connecting or disconnecting the utility network according to the change trend, the timeliness of connecting or disconnecting the utility power is ensured, the use of the power consumption module is not affected by insufficient power supply, the surplus generated energy of the distributed generation unit is not wasted, and the stability of the internal power supply of the micro-grid is ensured.
Specifically, the number of the power generation environment detection units is the same as the number of the distributed power generation units, and the power generation environment detection units are in one-to-one correspondence with the distributed power generation units;
the control system numbers the power generation environment detection units and the distributed power generation units and marks the power generation environment detection units as a first power generation environment detection unit A1, a second power generation environment detection unit A2, an N power generation environment detection unit An, a first distributed power generation unit B1, a second distributed power generation unit B2, an N distributed power generation unit Bn;
the first power generation environment detection unit A1 detects the power generation environment of the first distributed power generation unit B1 and transmits the detection result to the central control module, the second power generation environment detection unit A2 detects the power generation environment of the second distributed power generation unit B2 and transmits the detection result to the central control module, the nth power generation environment detection unit An detects the power generation environment of the nth distributed power generation unit Bn and transmits the detection result to the central control module;
and the central control module evaluates the unit-time generated energy of the corresponding distributed power generation units according to the power generation environment detection units, integrates the unit-time generated energy of all the evaluated distributed power generation units, and evaluates the current unit-time generated energy of the micro-grid electrical system.
The current unit-time power generation amount evaluation value is Cz, cz=
Wherein, ci is the current unit time power generation amount of the i-th distributed power generation unit Bi estimated by the central control module according to the data detected by the i-th power generation environment detection unit Ai.
Specifically, the power consumption module records the power consumption capacity of the current period, and the central control module analyzes the power consumption module according to the current power consumption capacity of the power consumption module and the historical contemporaneous power consumption data and predicts the power consumption Dx of the power consumption module in unit time;
the central control module acquires the stored electricity Ec of the energy storage unit, integrates the stored electricity Ec with the estimated power generation amount Cz in unit time, compares the integrated result K with the estimated power consumption Dx in unit time of the power consumption module, and judges whether to introduce commercial power or not, wherein K=ec+Cz.
The power consumption in the next unit time is evaluated through the historical power consumption data and the real-time power consumption, so that the accuracy of an evaluation power consumption result is guaranteed, the timeliness of switching in and switching out the mains supply is guaranteed, and the stability of power supply in the micro-grid is further guaranteed.
In particular, the method comprises the steps of,
if K is larger than Dx, the control system judges that the mains supply is not required to be introduced;
if K is less than or equal to Dx, the control system judges that the commercial power needs to be introduced;
when the central control module judges that the commercial power needs to be introduced, the control system controls the commercial power connecting unit to connect the commercial power network and the power consumption module.
Specifically, when the commercial power is introduced, each power generation environment detection unit detects the power generation environment of the corresponding distributed power generation unit in real time and transmits the detection result to the central control module, and the central control module re-evaluates the power generation amount Cz' of the next unit time according to the acquired data information;
the central control module compares the actual power consumption Ds of the power consumption module in unit time with the estimated power consumption Dx of the power consumption module in unit time and adjusts the estimated power consumption Dx' of the next unit time;
the control system is internally provided with a minimum threshold Y for the electricity storage quantity required by disconnecting the mains supply;
when Cz '> Dx' and Ec > Y, the control system controls the mains connection unit to disconnect the mains network from the power consumption module.
In particular, the value of the lowest threshold value of the electricity storage quantity required for disconnecting the mains supply is related to the slope S when the electricity storage quantity stored in the energy storage unit is increased, the larger the slope S is, the smaller the value of the lowest threshold value Y is, the setting is,
Y=
wherein y is an electricity value of 80% of rated electricity storage capacity of the energy storage unit, s1 is a first evaluation value of slope when the lowest threshold is regulated, s2 is a second evaluation value of slope when the lowest threshold is regulated, p1 is the lowest threshold, a first regulation value is calculated, and p2 is the lowest threshold, a second regulation value is calculated.
s1=0.3，s2=1.2，p1=0.08，
=s2×p1。
The larger the increment slope of the electricity storage quantity is, the larger the electricity generation capacity in the current time period is, at the moment, the lowest threshold value of the electricity storage quantity required by the breaking of the mains supply is properly reduced, the excessive electricity generation is prevented, the waste of electric power resources is avoided, and the stability of the internal power supply of the micro-grid is ensured.
Specifically, the central control module acquires the electricity storage amount of the energy storage unit in real time when the energy storage unit is not connected with the commercial power network, the control system is internally provided with an electricity storage amount feedback evaluation value, and if the electricity storage amount of the energy storage unit is larger than the electricity storage amount feedback evaluation value, the control system sends an instruction to the commercial power connection unit, connects the energy storage unit with the commercial power network and feeds back the electricity generated by the distributed generation unit to the commercial power network.
When the electricity generation quantity reaches a certain value, the generated electricity quantity is fed back to the electric power system, so that the electricity generation is not wasted while the stability of power supply in the micro-grid is ensured.
Specifically, the central control module obtains the electricity storage quantity of the energy storage unit in real time when feeding back electricity to the commercial power network, and if the electricity storage quantity of the energy storage unit is smaller than the electricity storage quantity feedback evaluation value, the control system sends an instruction to the commercial power connection unit to disconnect the energy storage unit from the commercial power network.
Specifically, the value of the stored-electricity-quantity feedback evaluation value is correlated with the slope T when the stored electricity quantity in the energy storage unit is increased or decreased,
when the stored electric quantity in the energy storage unit is increased, the larger the slope is, the smaller the value of the feedback evaluation value of the stored electric quantity is;
when the stored electric quantity in the energy storage unit is decreased, the smaller the slope is, the larger the value of the feedback evaluation value of the stored electric quantity is.
The feedback evaluation value is set to be Z,
as the amount of stored electricity is increased in increments,
Z=
，
when the amount of stored electricity is decreased down,
Z=
，
wherein z1 is an electric quantity value of 90% of rated electric quantity of the energy storage unit, z2 is an electric quantity value of 70% of rated electric quantity of the energy storage unit, t1 is a first evaluation value of slope when calculating an electric quantity feedback evaluation value, t2 is a second evaluation value of slope when calculating an electric quantity feedback evaluation value, t3 is a third evaluation value of slope when calculating an electric quantity feedback evaluation value, q1 is a first adjustment value of electric quantity feedback evaluation value, q2 is a second adjustment value of electric quantity feedback evaluation value, and q3 is a third adjustment value of electric quantity feedback evaluation value;
t1=0.3，t2=1.2，q1=0.07，
=t2×q1，t3=-0.5，q3=0.08。
the larger the increment slope of the electricity storage quantity is, the larger the electricity generation capacity in the current time period is, the value of the electricity storage quantity feedback evaluation value is properly reduced, the stability of power supply inside the micro-grid is ensured, and meanwhile, excessive electricity generation and waste of electric power resources are prevented. The smaller the decreasing slope of the electricity storage quantity is, the generated electricity quantity is insufficient to feed back the utility network when the operation of the electricity consumption module is maintained, and the value of the electricity storage quantity feedback evaluation value is properly increased at the moment, so that the stability of power supply inside the micro-grid is ensured.
Specifically, the types of the distributed power generation units include a hydroelectric power generation unit, a thermal power generation unit, a wind power generation unit, a solar power generation unit, and a tidal power generation unit, wherein,
the data detected by the power generation environment detection unit corresponding to the water conservancy power generation unit are water level drop and water flow;
the data detected by the power generation environment detection unit corresponding to the thermal power generation unit is heat generated by combustion;
the data detected by the power generation environment detection unit corresponding to the wind power generation unit is the wind speed of the environment;
the data detected by the power generation environment detection unit corresponding to the solar power generation unit are illumination intensity and angle;
the data detected by the power generation environment detection unit corresponding to the tidal power generation unit is the water storage capacity in the tide rising state.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. A micro-grid monitoring system for an electrical micro-grid, comprising,
a micro-grid electrical system comprises two or more distributed power generation units, an energy storage unit, a power generation environment detection unit, a power consumption module and a central control module, wherein,
the distributed power generation unit is used for generating power;
the power generation environment detection unit is used for detecting environment information of the distributed power generation units;
the energy storage unit is respectively connected with the distributed power generation unit and the power consumption module, and is used for storing the electric quantity produced by the distributed power generation unit and supplying energy to the power consumption module;
the central control module is respectively connected with the distributed power generation unit, the energy storage unit, the power generation environment detection unit and the power consumption module, and is used for evaluating the power generation capacity of the distributed power generation unit, acquiring the power storage capacity in the energy storage unit, storing historical power consumption data of the power consumption module in the central control module, and estimating the power consumption of the power consumption module per unit time according to the historical power consumption data;
the mains supply connection unit is respectively connected with the energy storage unit, the power consumption module and the mains supply network, and can supplement power to the micro-grid electrical system or recover interference power of the micro-grid electrical system to the mains supply network through the mains supply;
the control system is respectively connected with the micro-grid electrical system and the commercial power connection unit, can judge the power generation capacity of the distributed power generation unit according to the data detected by the power generation environment detection unit, can acquire the trend of the change of the power storage quantity in the energy storage unit in real time, judges whether the commercial power network is connected according to the power generation capacity, the trend of the change of the power storage quantity in the energy storage unit and the power stored in the energy storage unit, and adjusts the time for connecting or disconnecting the commercial power network according to the trend of the change of the power storage quantity in the energy storage unit.
2. The micro grid monitoring system for an electrical micro grid according to claim 1, wherein the number of the power generation environment detection units is the same as the number of the distributed power generation units, and the power generation environment detection units are in one-to-one correspondence with the distributed power generation units;
the control system numbers the power generation environment detection units and the distributed power generation units and marks the power generation environment detection units as a first power generation environment detection unit, a second power generation environment detection unit, a first distributed power generation unit, a second distributed power generation unit and an nth power generation environment detection unit respectively;
the first power generation environment detection unit detects the power generation environment of the first distributed power generation unit and transmits a detection result to the central control module, the second power generation environment detection unit detects the power generation environment of the second distributed power generation unit and transmits a detection result to the central control module, and the nth power generation environment detection unit detects the power generation environment of the nth distributed power generation unit and transmits a detection result to the central control module;
and the central control module evaluates the unit-time generated energy of the corresponding distributed power generation units according to the power generation environment detection units, integrates the unit-time generated energy of all the evaluated distributed power generation units, and evaluates the current unit-time generated energy of the micro-grid electrical system.
3. The micro-grid monitoring system for an electrical micro-grid according to claim 2, wherein the power consumption module records the power consumption capacity of the current period, and the central control module analyzes the power consumption module according to the current power consumption capacity of the power consumption module and the historical contemporaneous power consumption data to estimate the power consumption of the power consumption module per unit time;
the central control module acquires the stored electric quantity of the energy storage unit, integrates the stored electric quantity with the estimated power generation amount in unit time, compares the integrated result with the estimated power consumption amount in unit time of the power consumption module, transmits the comparison result to the control system, and the control system judges whether the commercial power is introduced.
4. A microgrid monitoring system for an electrical microgrid according to claim 3, characterized in that,
if the integration result is larger than the estimated power consumption of the power consumption module in unit time, the control system judges that the mains supply is not required to be introduced;
if the integration result is smaller than or equal to the estimated power consumption of the power consumption module in unit time, the control system judges that the commercial power needs to be introduced;
when the central control module judges that the commercial power needs to be introduced, the control system controls the commercial power connecting unit to connect the commercial power network and the power consumption module.
5. A microgrid monitoring system for an electrical microgrid according to claim 4, characterized in that,
when the commercial power is introduced, each power generation environment detection unit detects the power generation environment of the corresponding distributed power generation unit in real time and transmits the detection result to the central control module, and the central control module evaluates the power generation amount of the next unit time again according to the acquired data information;
the central control module compares the actual power consumption of the power consumption module in unit time with the estimated power consumption of the power consumption module in unit time and adjusts the estimated power consumption of the next unit time;
the control system is internally provided with a minimum threshold value of electricity storage quantity required by disconnecting the mains supply;
when the power generation amount in the next unit time is larger than the estimated power consumption in the next unit time and the power quantity stored in the energy storage unit is larger than the minimum threshold value of the power storage quantity required by disconnecting the mains supply, the control system controls the mains supply connection unit to disconnect the mains supply from the power consumption module.
6. A microgrid monitoring system for an electrical microgrid according to claim 5, characterized in that,
the value of the lowest threshold value of the electricity storage quantity required for disconnecting the mains supply is related to the slope of the electricity storage quantity stored in the energy storage unit when the electricity storage quantity is increased, and the larger the slope is, the smaller the value of the lowest threshold value is.
7. The micro-grid monitoring system for an electrical micro-grid according to claim 4, wherein the central control module acquires the electricity storage amount of the energy storage unit in real time when the energy storage unit is not connected with the utility network, a electricity storage amount feedback evaluation value is set in the control system, and if the electricity storage amount of the energy storage unit is greater than the electricity storage amount feedback evaluation value, the control system sends an instruction to the utility power connection unit, connects the energy storage unit with the utility network, and feeds back the electricity generated by the distributed generation unit to the utility network.
8. The micro grid monitoring system for an electrical micro grid according to claim 7, wherein the central control module obtains the electricity storage amount of the energy storage unit in real time when feeding back electricity to the utility grid, and if the electricity storage amount of the energy storage unit is smaller than the electricity storage amount feedback evaluation value, the control system sends an instruction to the utility grid connection unit to disconnect the energy storage unit from the utility grid.
9. The micro grid monitoring system for an electrical micro grid according to claim 8, wherein the value of the stored electricity amount feedback evaluation value is related to a slope when the stored electricity amount in the energy storage unit is increased or decreased,
when the stored electric quantity in the energy storage unit is increased, the larger the slope is, the smaller the value of the feedback evaluation value of the stored electric quantity is;
when the stored electric quantity in the energy storage unit is decreased, the smaller the slope is, the larger the value of the feedback evaluation value of the stored electric quantity is.
10. The micro grid monitoring system for an electrical micro grid according to claim 1, wherein the kinds of distributed generation units include a hydro-power generation unit, a thermal power generation unit, a wind power generation unit, a solar power generation unit and a tidal power generation unit, wherein,
the data detected by the power generation environment detection unit corresponding to the water conservancy power generation unit are water level drop and water flow;
the data detected by the power generation environment detection unit corresponding to the thermal power generation unit is heat generated by combustion;
the data detected by the power generation environment detection unit corresponding to the wind power generation unit is the wind speed of the environment;
the data detected by the power generation environment detection unit corresponding to the solar power generation unit are illumination intensity and angle;
the data detected by the power generation environment detection unit corresponding to the tidal power generation unit is the water storage capacity in the tide rising state.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130079943A1 (en) * | 2011-09-28 | 2013-03-28 | Ii Thomas Francis Darden | Systems and methods for microgrid power generation management with selective disconnect |
| CN205646811U (en) * | 2016-05-24 | 2016-10-12 | 中广核太阳能开发有限公司 | Photovoltaic directly exchanges and mixes little grid system |
| CN106356901A (en) * | 2016-10-09 | 2017-01-25 | 江苏现代能源微网系统有限公司 | Micro-grid energy regulation method suitable for single residence |
| CN112332524A (en) * | 2020-10-16 | 2021-02-05 | 湖北华夏明源能源管理有限公司 | Direct-current micro-grid system of light storage type charging station |
| CN215185864U (en) * | 2021-04-20 | 2021-12-14 | 苏州天富利新能源科技有限公司 | Distributed light storage system charging and storing control system |
| WO2022018680A1 (en) * | 2020-07-22 | 2022-01-27 | U Energy Ltd | Micro-grid, energy management system and method |
| CN115842369A (en) * | 2023-01-04 | 2023-03-24 | 江苏舜大新能源科技有限公司 | Modularized light storage all-in-one machine and control method thereof |
-
2023
- 2023-04-23 CN CN202310440891.1A patent/CN116154974B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130079943A1 (en) * | 2011-09-28 | 2013-03-28 | Ii Thomas Francis Darden | Systems and methods for microgrid power generation management with selective disconnect |
| CN205646811U (en) * | 2016-05-24 | 2016-10-12 | 中广核太阳能开发有限公司 | Photovoltaic directly exchanges and mixes little grid system |
| CN106356901A (en) * | 2016-10-09 | 2017-01-25 | 江苏现代能源微网系统有限公司 | Micro-grid energy regulation method suitable for single residence |
| WO2022018680A1 (en) * | 2020-07-22 | 2022-01-27 | U Energy Ltd | Micro-grid, energy management system and method |
| CN112332524A (en) * | 2020-10-16 | 2021-02-05 | 湖北华夏明源能源管理有限公司 | Direct-current micro-grid system of light storage type charging station |
| CN215185864U (en) * | 2021-04-20 | 2021-12-14 | 苏州天富利新能源科技有限公司 | Distributed light storage system charging and storing control system |
| CN115842369A (en) * | 2023-01-04 | 2023-03-24 | 江苏舜大新能源科技有限公司 | Modularized light storage all-in-one machine and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 平朝春 等: "海洋可再生能源发电系统的电能变换与能量管理系统关键技术研究", 中国海上油气, vol. 25, no. 6, pages 119 - 123 * |
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