CN110768274B - Power control method and device for isolated microgrid - Google Patents
Power control method and device for isolated microgrid Download PDFInfo
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- CN110768274B CN110768274B CN201911068000.4A CN201911068000A CN110768274B CN 110768274 B CN110768274 B CN 110768274B CN 201911068000 A CN201911068000 A CN 201911068000A CN 110768274 B CN110768274 B CN 110768274B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The embodiment of the application discloses a power control method and a device of an isolated microgrid, and the method comprises the following steps: determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler; and adjusting the power of the isolated microgrid according to the operating state of the energy storage device, wherein the power of the isolated microgrid comprises the power of the energy storage device. Therefore, in the process of carrying out real-time power control on the isolated micro-grid comprising the energy storage battery and/or the heat storage boiler, the operation state of the energy storage battery and/or the heat storage boiler is fully considered, and further, the energy in the isolated micro-grid can be balanced and optimally scheduled, and high-quality power supply and heating service is provided.
Description
Technical Field
The application relates to the field of power system automation, in particular to a power control method and device for an isolated microgrid.
Background
The microgrid refers to a power network which is composed of a plurality of distributed power supplies and related loads according to a certain topological structure, the microgrid is connected to a conventional power grid through a switch, the microgrid can realize large-scale access of the distributed power supplies and renewable energy sources, and high-reliability supply of the loads is realized through various energy forms, wherein the isolated microgrid refers to a microgrid which can be independently built and operated, and is not connected with the conventional power grid.
With the continuous advance of the reform of the power industry, an isolated microgrid gradually develops towards the trend of complex structure, large capacity and diversification, however, when the structure of the isolated microgrid is more complex, for example, for an isolated microgrid comprising a photovoltaic power station, a wind power station and an energy storage device (such as an energy storage battery or a heat storage boiler), according to the existing real-time power control method of the isolated microgrid, all energy of the isolated microgrid cannot be balanced and optimally scheduled, and further the energy supply and demand relationship among the photovoltaic power generation, the wind power generation, the energy storage battery and the heat storage boiler cannot be well coordinated.
Disclosure of Invention
The embodiment of the application is expected to provide a power control technical scheme of an isolated microgrid.
The embodiment of the application provides a power control method of an isolated microgrid, which comprises the following steps:
determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler;
determining the power of the isolated microgrid according to the operating state of the energy storage device
Optionally, when the energy storage device includes an energy storage battery, the adjusting the power of the isolated microgrid according to the operating state of the energy storage device includes:
and determining the output power of the power generation device in the isolated microgrid according to the state of charge value of the energy storage battery.
Optionally, the determining the output power of the power generation device in the isolated microgrid according to the state of charge of the energy storage battery includes:
and when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, determining the charging power of the energy storage battery according to the state of charge of the energy storage battery, and determining the output power of the power generation device in the isolated microgrid according to the charging power of the energy storage battery.
Optionally, the determining the charging power of the energy storage battery according to the state of charge of the energy storage battery includes:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
Optionally, the determining a charging power reduction factor according to the state of charge value of the energy storage battery includes:
determining the charging power decreasing factor according to the energy storage battery state of charge value, the initial maximum state of charge value and the correlation coefficient of the energy storage battery state of charge value and the charging power decreasing factor;
alternatively, the charging power reduction factor is determined according to a table look-up.
Optionally, the method further comprises:
and when the state of charge value of the energy storage battery is greater than or equal to a preset maximum state of charge value, stopping charging the energy storage battery.
Optionally, when the energy storage device comprises an energy storage battery and a heat storage boiler, the adjusting the power of the isolated microgrid according to the operating state of the energy storage device comprises:
determining the preset charging power of the energy storage battery and the preset power of the heat storage boiler, and determining the preset output power of a power generation device in the isolated microgrid according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler; the preset output power of the power generation device is greater than or equal to the sum of the preset charging power of the energy storage battery and the preset power of the heat storage boiler.
Optionally, the method further comprises:
when the state of charge value of the energy storage battery is larger than or equal to a preset maximum state of charge value and the residual power of a power generation device in the isolated microgrid is larger than 0, determining the power increase value of the heat storage boiler according to the residual power of the power generation device; and the residual power of the power generation device is the residual power of the output power of the power generation device under the condition of meeting the load power consumption in the isolated micro-grid.
Optionally, the determining the power of the isolated microgrid according to the operating state of the energy storage device includes:
and adjusting the output power of the power generation device in the isolated microgrid according to the isolated microgrid bus frequency.
The embodiment of the present application further provides a power control device of an isolated microgrid, the device includes: detection module and processing module, wherein:
a detection module: the system is used for determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler;
a processing module: and the power control unit is used for determining the power of the isolated microgrid according to the operating state of the energy storage device.
Optionally, when the energy storage device includes an energy storage battery, the processing module is configured to:
and determining the output power of the power generation device in the isolated microgrid according to the state of charge value of the energy storage battery.
Optionally, the processing module is configured to:
and when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, determining the charging power of the energy storage battery according to the state of charge of the energy storage battery, and determining the output power of the power generation device in the isolated microgrid according to the charging power of the energy storage battery.
Optionally, the processing module is configured to:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
Optionally, the processing module is configured to:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
Optionally, the processing module is configured to:
determining the charging power decreasing factor according to the energy storage battery state of charge value, the initial maximum state of charge value and the correlation coefficient of the energy storage battery state of charge value and the charging power decreasing factor;
alternatively, the charging power reduction factor is determined according to a table look-up.
Optionally, when the energy storage device comprises an energy storage battery and a heat storage boiler, the processing module is configured to:
determining the preset charging power of the energy storage battery and the preset power of the heat storage boiler, and determining the preset output power of a power generation device in the isolated microgrid according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler; the preset output power of the power generation device is greater than or equal to the sum of the preset charging power of the energy storage battery and the preset power of the heat storage boiler. Optionally, the processing module is further configured to:
when the state of charge value of the energy storage battery is larger than or equal to a preset maximum state of charge value and the residual power of a power generation device in the isolated microgrid is larger than 0, determining the power increase value of the heat storage boiler according to the residual power of the power generation device; and the residual power of the power generation device is the residual power of the output power of the power generation device under the condition of meeting the load power consumption in the isolated micro-grid.
Optionally, the processing module is further configured to:
and adjusting the output power of the power generation device in the isolated microgrid according to the isolated microgrid bus frequency.
In the power control method and device for the isolated microgrid provided by the embodiment of the application, the operation state of an energy storage device in the isolated microgrid is determined; the energy storage device comprises an energy storage battery and/or a heat storage boiler; and adjusting the power of the isolated microgrid according to the operating state of the energy storage device, wherein the power of the isolated microgrid comprises the power of the energy storage device. Therefore, in the process of carrying out real-time power control on the isolated micro-grid comprising the energy storage battery and/or the heat storage boiler, the operation state of the energy storage battery and/or the heat storage boiler is fully considered, and further, the energy in the isolated micro-grid can be balanced and optimally scheduled, and high-quality power supply and heating service is provided.
Drawings
Fig. 1 is a schematic flowchart of a power control method for an isolated microgrid according to an embodiment of the present application;
fig. 2 is a state-of-charge interval diagram of an energy storage battery in a non-heating season according to an embodiment of the present disclosure;
fig. 3 is a state-of-charge interval diagram of an energy storage battery in a heating season according to an embodiment of the present disclosure;
fig. 4 is a system configuration diagram of power control of an isolated microgrid according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a power control apparatus of an isolated microgrid according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the examples provided herein are merely illustrative of the present application and are not intended to limit the present application. In addition, the following examples are provided as partial examples for implementing the present application, not all examples for implementing the present application, and the technical solutions described in the examples of the present application may be implemented in any combination without conflict.
It should be noted that in the embodiments of the present application, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a method or apparatus including a series of elements includes not only the explicitly recited elements but also other elements not explicitly listed or inherent to the method or apparatus. Without further limitation, the use of the phrase "including a. -. said." does not exclude the presence of other elements (e.g., steps in a method or elements in a device, such as portions of circuitry, processors, programs, software, etc.) in the method or device in which the element is included.
For example, the power control method for the isolated microgrid provided by the embodiment of the present application includes a series of steps, but the power control method for the isolated microgrid provided by the embodiment of the present application is limited to the described steps, and similarly, the power control method for the isolated microgrid provided by the embodiment of the present application includes a series of modules, but the apparatus provided by the embodiment of the present application is not limited to include the modules explicitly described, and may include modules that are required to acquire relevant information or perform processing based on the information.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
In some embodiments of the present application, a power control method for an isolated microgrid is provided, which can balance and optimally schedule energy in the isolated microgrid, thereby providing high-quality power supply and heating services.
Example one
Fig. 1 is a schematic flowchart of a power control method for an isolated microgrid according to an embodiment of the present application, where the method includes the following steps:
s101: determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler;
optionally, before this step, day-ahead optimized scheduling may be performed on the isolated microgrid, where day-ahead optimized scheduling refers to a method for determining short-term power data in the isolated microgrid, and specifically, short-term power data and short-term load data of the isolated microgrid may be predicted, and then the day-ahead optimized scheduling power data of the isolated microgrid is determined through a day-ahead optimized scheduling algorithm, for example, short-term output power data of a power generation device in the isolated microgrid may be predicted, the power generation device may be a photovoltaic power station, a wind power station, or another power generation device, and the short-term power data may be an output power value of each time point at a time point of 15 minutes every 24 hours of the next day; the short term load data may be the power consumed by the load in the isolated microgrid at each time point every 15 minutes for 24 hours on the following day.
In a specific example, short-term output power data of photovoltaic power stations and wind power stations in an isolated microgrid and load data are predicted according to the operation state of the isolated microgrid, wherein the predicted data amount is the photovoltaic power stations and wind power station output power at 96 points in a day and 3 days in the future and the load consumption power, and then day-ahead optimized scheduling power data of the photovoltaic power stations and the wind power stations at 96 points in the day and 3 days in the future are determined through a day-ahead optimized scheduling algorithm, wherein the predicted data need to be determined before day-ahead optimized scheduling.
Optionally, after performing day-ahead optimization scheduling on the isolated microgrid, performing day-in-day rolling optimization on the isolated microgrid, where the day-in-day rolling optimization refers to a method for determining ultrashort-term power data in the isolated microgrid, specifically, predicting the ultrashort-term power data of the isolated microgrid and the ultrashort-term load data, and further determining the day-in-day rolling optimization power data of the isolated microgrid through a day-in-day rolling optimization algorithm, where the ultrashort-term power data may be, for example, an output power value of each time point of a power generation device in the isolated microgrid at a time point of 15 minutes in the next four hours; the ultra-short term load data may be an output power value of each time point of a load in the isolated microgrid every 15 minutes for four hours in the future.
Therefore, the device power in the isolated microgrid can be predicted in advance by carrying out day-ahead optimization scheduling and day-in-day rolling optimization on the isolated microgrid, and a basis is further provided for actual power regulation of the isolated microgrid.
Alternatively, the operating state of the energy storage device may be a charging state of the energy storage battery, or a discharging state of the energy storage battery, and may also be a state in which the heat storage boiler needs to increase power, or a state in which the heat storage boiler needs to decrease power.
For the implementation of this step, for example, the operating states of the power generation device and the energy storage device in the isolated microgrid may be determined according to at least one of the following factors: the specific examples include time, a State of charge (SOC) of the energy storage battery, and weather conditions, where the time may be a certain time period in the daytime, a certain time period in the evening, or other specified time periods, the SOC of the energy storage battery may be a specific SOC value, the weather conditions may be light intensity, wind power, or other weather conditions, and the power generation device may be a photovoltaic power station, a wind power station, or other power generation devices meeting the operation requirements of the isolated microgrid.
In a first specific example, the energy storage device comprises an energy storage battery, the energy storage battery is in an operating state, and the power generation device comprises a photovoltaic power station and a wind power station; when the light is sufficient in the daytime, the photovoltaic power station mainly provides power generation output; when light is insufficient in the daytime, the photovoltaic power station and the wind power station provide power generation output at the same time; when wind exists at night, the wind power station mainly provides power generation output; and when the state of charge value of the energy storage battery is smaller than the preset maximum state of charge value, namely the energy storage battery is in a chargeable state, determining that the photovoltaic power station and/or the wind power station provide charging power for the energy storage battery according to the time and the weather conditions.
In a second specific example, the energy storage battery is in an operating state, the power generation device comprises a photovoltaic power station and a wind power station, and when no wind exists at night or the wind power is small, namely when the generated output of the photovoltaic power station and the wind power station cannot guarantee the load consumption in the isolated microgrid, the load consumption in the isolated microgrid is guaranteed through the discharge of the energy storage battery.
In a third specific example, the energy storage device includes an energy storage battery and a thermal storage boiler, that is, the energy storage battery and the thermal storage boiler are in working states, and the power generation device includes a photovoltaic power station and a wind power station, according to the method described in the first example and the second example, when the photovoltaic power station and/or the wind power station provides power generation output and the power generation output has a surplus, and at the same time, the state of charge value of the energy storage battery is greater than a preset maximum state of charge value, that is, when the energy storage battery does not need to be charged, the power of the thermal storage boiler is increased to achieve the consumption of the power generation surplus power of the photovoltaic power station and/or the wind power station; when the generated output provided by the photovoltaic power station and/or the wind power station is insufficient, the energy storage battery discharges to meet the consumption of other loads in the heat storage boiler and the isolated micro-grid.
Therefore, in the process of carrying out real-time power control on the isolated microgrid comprising the energy storage battery and/or the heat storage boiler, the operation state of the energy storage battery and/or the heat storage boiler is fully considered, and further, the energy in the isolated microgrid can be balanced and optimally scheduled.
S102: and adjusting the power of the isolated microgrid according to the operating state of the energy storage device, wherein the power of the isolated microgrid comprises the power of the energy storage device.
For the implementation of this step, for example, when the energy storage device includes an energy storage battery, the output power of the power generation device in the isolated microgrid can be determined according to the state of charge value of the energy storage battery,
it can be seen that when the energy storage battery in the isolated microgrid is in a working state, the power value required to be output by the power generation device in the isolated microgrid can be accurately acquired according to the real-time state of charge value of the energy storage battery.
Optionally, when the state of charge value of the energy storage battery is smaller than the preset maximum state of charge value, the charging power of the energy storage battery can be determined according to the state of charge value of the energy storage battery, and then the output power of the power generation device in the isolated microgrid can be determined according to the charging power of the energy storage battery.
It can be seen that when the state of charge value of the energy storage battery is smaller than the preset maximum state of charge value, that is, the energy storage battery is in a chargeable state, at this time, the energy storage battery can be charged safely.
Further, when the state of charge value of the energy storage battery is greater than or equal to the preset maximum state of charge value, the energy storage battery is stopped from being charged, and the output power of the power Generation device may be adjusted, for example, by an Automatic Generation Control (AGC) system, such as reducing or stopping the output power of the power Generation device by the AGC system.
It can be seen that when the state of charge value of the energy storage battery is greater than or equal to the preset maximum state of charge value, that is, the energy storage battery is in a full-charge state, at the moment, the energy storage battery is stopped to be charged, and the service life of the energy storage battery is further prolonged.
Optionally, a charging power decrement factor may be determined according to the state of charge value of the energy storage battery, and then the charging power of the energy storage battery may be determined according to the charging power decrement factor; the charging power decrement factor is used for representing the charging power parameter of the energy storage battery, which is reduced along with the increase of the state of charge value of the energy storage battery.
In one particular example, the output power of the power plant in the isolated microgrid may be determined by equation (1):
Psource_Gen_Set＝Psys_Load+PCharge_In_Max*Csoc_cosf (1)
wherein, Psource_Gen_SetFor isolated microgridOutput power of medium power generation device, Psvs_LoadFor user side loading power, PCharge_In_MaxFor maximum charging power, P, of energy storage cells in isolated microgridCharge_In_MaxCan be determined according to the product of the number of the energy storage batteries operating in the isolated microgrid and the maximum charging power of the energy storage battery monomer, Csoc_cosfThe charging power is decremented by a factor.
It can be seen that the maximum charging power P of the energy storage batteryCharge_In_MaxAnd a charging power decreasing factor Csoc_cosfThe product of the two values is the charging power of the energy storage battery, further, according to the meaning of the charging power decreasing factor, when the state of charge value of the energy storage battery is increased, the charging power of the energy storage battery is reduced, and further the output power of the power generation device is correspondingly reduced, so that the charging power of the energy storage battery and the output power of the power generation device are adjusted according to the real-time state of charge value of the energy storage battery, and the adjusted output power of the power generation device meets the actual charging requirement of the energy storage battery, and further the accuracy of power control of each device in the isolated microgrid is improved.
Optionally, the value of the charging power decreasing factor may be determined according to the state of charge value of the energy storage battery, the intercept of the state of charge value, and the adjustment acceleration coefficient;
in one specific example, as shown in equation (2)
Csoc_coef＝B-kgen*SOC (2)
Wherein SOC is the charge state value of the energy storage battery, B is the initial maximum charge state value of the energy storage battery, kgenFor the correlation coefficient of the energy storage battery state of charge value and the charging power decrement factor, k is exemplarygenThe method can be determined by least square fitting according to the state of charge value of the energy storage battery and historical data of the state of charge value of the energy storage battery.
Alternatively, the value of the charge power decrement factor may also be determined according to a table lookup.
In one specific example, the relationship between the energy storage battery state of charge value and the corresponding charging power decrement factor value can be illustrated by table (1):
watch (1)
Therein, SOCminRepresenting a predetermined minimum state of charge, SOClowRepresenting a predetermined discharge state-of-charge value, SOChighRepresenting a predetermined state of charge, SOCmaxRepresenting a preset maximum state of charge value, and representing a descending judgment threshold: and only when the determined charging power decrement factor value is larger than the issuing judgment threshold, the charging power decrement factor value can be issued to the isolated microgrid real-time power control system to calculate the charging power and the output power of the power generation device, and optionally, the issuing judgment threshold can be set according to actual requirements.
It can be seen that, the state of charge value of each energy storage battery and the corresponding charging power decrement factor value are preset in advance through a table look-up method, and then in the actual power control of the isolated microgrid, the corresponding charging power decrement factor value is determined in the table according to the actual state of charge value of the energy storage battery, so that the charging power of the energy storage battery and the output power of the power generation device can be determined rapidly, and further, the state of charge values of the energy storage batteries in the table and the corresponding charging power decrement factor values can be optimized and updated regularly according to actual requirements.
In one practical application scenario, as shown in fig. 2, a state-of-charge interval diagram of an energy storage battery in a non-heating season is shown, wherein the non-heating season indicates that a heat storage boiler in an energy storage device is out of operation, wherein the SOCminRepresents a preset minimum state of charge value, here, the preset minimum state of charge value SOCminAt 25%, SOClowRepresents a preset discharge state-of-charge value, here, the preset discharge state-of-charge value SOClow35% of SOChighIndicating preset chargeState of charge value, here preset state of charge value SOChigh70% of SOCmaxRepresents a preset maximum state of charge value, here, the preset maximum state of charge value SOCmaxIs 80%, wherein, SOCmaxAnd SOChighThe interval is a power-limited slow charging interval, SOChighAnd SOClowThe interval between is the safe rapid charging interval, SOClowAnd SOCminThe interval between the two is a power-limited slow discharge interval; further, in the actual power control process of the isolated microgrid, when the actual state of charge value of the energy storage battery is greater than or equal to 80%, namely greater than or equal to the preset maximum state of charge value SOCmaxWhen the power is generated, the output of the power generation device is reduced or stopped through an AGC system; when the actual state of charge value of the energy storage battery is in the limited power slow charging interval, the energy storage battery can be charged at the moment, but the state of charge value and the SOC of the energy storage battery in the interval aremaxTherefore, the charging power required to be provided for the energy storage battery is smaller, and a proper charging power decreasing factor can be determined through a formula method or a table look-up method, so that the actual state of charge value and SOC of the energy storage battery are ensured to be obtainedmaxWhen the energy storage battery approaches, the charging power provided for the energy storage battery is gradually reduced; when the actual state of charge value of the energy storage battery is in a safe and rapid charging interval, at the moment, a proper charging power decreasing factor can be determined through a formula method or a table look-up method, so that proper charging power of the energy storage battery is determined, and the energy storage battery is rapidly charged; when the actual state of charge value of the energy storage battery is in the power-limiting slow discharge interval, at the moment, if the energy storage battery is in the charge state, a proper charge power decreasing factor can be determined by a formula method or a table look-up method, so that proper charge power of the energy storage battery is determined, the energy storage battery is rapidly charged, if the energy storage battery is in the discharge state, the discharge state of the energy storage battery needs to be controlled, so that the discharge speed of the energy storage battery is reduced, and further, when the actual state of charge value of the energy storage battery is smaller than or equal to 25%, namely smaller than or equal to a preset minimum state of charge value SOC (SOC)minWhen the energy storage battery is discharged, the energy storage battery needs to be controlled to stop discharging.
For another implementation manner of this step, for example, when the energy storage device includes an energy storage battery and a heat storage boiler, that is, the energy storage battery and the heat storage boiler operate simultaneously, first, a preset charging power of the energy storage battery and a preset power of the heat storage boiler may be determined, and a preset output power of the power generation device in the isolated microgrid may be determined according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler; the preset output power of the power generation device is greater than or equal to the sum of the preset charging power of the energy storage battery and the preset power of the heat storage boiler, for example, the preset charging power of the energy storage battery and the preset power of the heat storage boiler at a specified time point can be determined, and then the output power of the power generation device in the isolated microgrid at the specified time point can be determined according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler at the specified time point, wherein the specified time point can be all time points within 24 hours of the next day and every 15 minutes, and can also be other time points set according to actual requirements.
It can be seen that the charging power is preset by presetting the energy storage battery in advance and the power is preset by the heat storage boiler, so that the power control of the energy storage battery and the heat storage boiler is realized under the condition that the energy storage battery and the heat storage boiler operate simultaneously.
In a specific example, the preset output power of the power generation device in the isolated microgrid is determined by the formula (3):
Psource_Gen_set(t)＝Psys_Load(t)+(Pboiler(t+1)-Pboiler(t))+PCharge_In_Max(t)*Csoc_cosf(3)
wherein, Pboiler(t) is the preset power of the heat storage boiler at a certain time point t, Pboiler(t +1) is the preset power of the heat storage boiler at the next time point t +1, Psource_Gen_set(t) is the preset output power of the power generation device in the isolated microgrid, Psys_Load(t) presetting load power, P, for user sideCharge_In_MaxAnd (t) is the preset maximum charging power of the energy storage battery in the isolated microgrid.
Further, at each time point t the preset power P of the heat storage boilerboiler(t) is required to be fullThe conditions of the feet are shown in formula (4):
Pboiler_min＜Pboiler(t)＜Pboiler_max (4)
wherein P isboiler_minIs the minimum load power of the heat storage boiler, namely the minimum power for ensuring the normal operation of the heat storage boiler, Pboiler_maxFor the maximum load power of the thermal storage boiler, the maximum load power of the thermal storage boiler is, for example, less than or equal to the rated maximum output power of the power generation device in the isolated microgrid.
Optionally, when the state of charge value of the energy storage battery is greater than or equal to a preset maximum state of charge value and the residual power of a power generation device in the isolated microgrid is greater than 0, determining a power increase value of the heat storage boiler according to the residual power of the power generation device; the remaining power of the power generation device is the remaining power of the output power of the power generation device under the condition of meeting the load power consumption in the isolated microgrid, and the power of the heat storage boiler can be adjusted by a heat storage boiler controller.
In a specific example, the energy storage device comprises an energy storage battery and a heat storage boiler, namely the energy storage battery and the heat storage boiler operate simultaneously, and the power generation device comprises a photovoltaic power station and a wind power station; when the photovoltaic power station and/or the wind power station provide power generation output and the real-time power of the heat storage boiler is larger than the minimum load power of the heat storage boiler, namely the power provided by the photovoltaic power station and/or the wind power station for the heat storage boiler meets the operation condition of the heat storage boiler, and meanwhile, the state of charge value of the energy storage battery is smaller than the preset maximum state of charge value, namely the energy storage battery is in a chargeable state, the charging power of the energy storage battery and the output power of the power generation device are determined according to the state of charge value of the energy storage battery and the corresponding charging power decrement factor; when the photovoltaic power station and/or the wind power station provides power generation output and the power generation output is surplus, and meanwhile, the state of charge value of the energy storage battery is larger than the preset maximum state of charge value, namely the energy storage battery does not need to be charged, the surplus power generated by the photovoltaic power station and/or the wind power station is absorbed by increasing the power of the heat storage boiler; when the generated output provided by the photovoltaic power station and/or the wind power station is insufficient, the energy storage battery discharges to meet the consumption of other loads in the heat storage boiler and the isolated micro-grid.
Under the premise of ensuring the normal operation of the energy storage battery and the heat storage boiler, the output power of the power generation device, the charging power of the energy storage battery and the power of the heat storage boiler are adjusted by combining the actual operation states of the power generation device, the energy storage battery and the heat storage boiler in the isolated microgrid, so that the energy in the isolated microgrid can be balanced and optimally scheduled in the actual operation under the condition that the energy storage battery and the heat storage boiler operate simultaneously, and further high-quality power supply and heating service is provided.
In one practical application scenario, as shown in fig. 3, a state-of-charge interval diagram of the energy storage battery in a heating season is shown, where the heating season indicates that the heat storage boiler and the energy storage battery in the energy storage device are both in working states, where SOCsaveAnd representing the priority charging state of charge value, namely, when the actual energy storage battery state of charge value is smaller than the priority charging state of charge value and the power generating device provides output power, preferentially charging the energy storage battery, and when the actual energy storage battery state of charge value is in other state of charge value intervals, the power control mode of the isolated microgrid is consistent with the power control mode in the energy storage battery state of charge intervals in non-heating seasons.
Optionally, the output power of the power generation device in the isolated microgrid can be adjusted according to the isolated microgrid bus frequency.
In a specific example, the isolated microgrid bus rated frequency is 50Hz, when monitoring shows that the actual bus frequency is higher than 50Hz, firstly, a frequency difference between the actual bus frequency and the bus rated frequency is determined, then, the frequency difference is converted into a power difference according to a frequency difference value coefficient, and finally, the output power of the power generation device in the isolated microgrid is adjusted according to the determined power difference value.
In an actual application scenario, referring to fig. 4, a system schematic diagram of power control of an isolated microgrid provided in an embodiment of the present application is shown, where the isolated microgrid includes a photovoltaic power station, a wind power station, an energy storage battery, and a heat storage boiler, first, according to an operation mode (including a bus operation state) in the isolated microgrid and an actual grid-connected operation number of the photovoltaic power station and/or the wind power station, performing day-ahead optimization scheduling on the isolated microgrid, that is, predicting short-term power data of the isolated microgrid and short-term load data (corresponding to the short-term predicted data in fig. 4), and further determining day-ahead optimization scheduling power data of the isolated microgrid by using a day-ahead optimization scheduling algorithm, further, performing day-ahead rolling optimization on the isolated microgrid after performing day-ahead optimization scheduling on the isolated microgrid, forecasting ultra-short-term power data and ultra-short-term load data of the isolated microgrid (corresponding to the ultra-short-term forecasting data in the figure 4), and determining rolling optimization power data of the isolated microgrid in days through a rolling optimization algorithm in days; then, on the basis of optimization scheduling power data before the day and rolling optimization power data in the day, real-time power control is carried out on the isolated microgrid, the operating states of a photovoltaic power station, a wind power station, an energy storage battery and a heat storage boiler in the isolated microgrid can be determined according to time, the charge state of the energy storage battery and weather conditions, and then real-time power of the photovoltaic power station, the wind power station, the energy storage battery and the heat storage boiler can be adjusted according to the operating states of the photovoltaic power station, the wind power station, the energy storage battery and the heat storage boiler, wherein whether the energy storage battery is in a chargeable state or not can be determined according to the charge state value of the energy storage battery, and after the energy storage battery is determined to be in the chargeable state, a corresponding charging power decreasing factor and the charging power of the energy storage battery are determined based on a formula method or a table look-up method, and then output power of the photovoltaic power station and the wind power station are determined, furthermore, the isolated microgrid power can be controlled in real time in a man-machine interaction mode, wherein a photovoltaic power station monitoring interface and a wind power station monitoring interface are used for combining time and weather conditions to determine the actual operation conditions and output conditions of the photovoltaic power station and the wind power station, an AGC control interface is used for adjusting the output power of the photovoltaic power station and the wind power station after the output power of the photovoltaic power station and the wind power station is obtained, or when the energy storage battery does not need to be charged, the output power of the photovoltaic power station and the wind power station is limited, a real-time power fixed value setting interface is used for inputting the charging power value of a specific energy storage battery or the output power value of the photovoltaic power station and the wind power station, an actual control curve interface is used for displaying other parameter information of the isolated microgrid in the real-time power control process, and further, the power adjustment of the heat storage boiler can be realized through a heat storage boiler controller.
In practical applications, the steps S101 to S102 may be implemented based on a Processor in an electronic Device, and the Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is to be understood that the electronic device for implementing the above-described processor function may be other electronic devices, and the embodiments of the present application are not limited in particular.
The embodiment of the application provides a power control method of an isolated microgrid, which is used for determining the running state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler; and adjusting the power of the isolated microgrid according to the operating state of the energy storage device, wherein the power of the isolated microgrid comprises the power of the energy storage device. Therefore, in the process of carrying out real-time power control on the isolated micro-grid comprising the energy storage battery and/or the heat storage boiler, the operation state of the energy storage battery and/or the heat storage boiler is fully considered, and further, the energy in the isolated micro-grid can be balanced and optimally scheduled, and high-quality power supply and heating service is provided.
Example two
In order to further embody the purpose of the present application, a further example is provided on the basis of the first embodiment of the present application.
In an actual application scenario, a specific control strategy for the real-time power of the isolated microgrid under different operation scenarios can be illustrated by the table (2):
watch (2)
Wherein, SPeedwind_10minThe average wind speed over 10min is indicated.
EXAMPLE III
Aiming at the power control method of the isolated microgrid in the first embodiment of the application, the third embodiment of the application also provides a power control device of the isolated microgrid.
Fig. 5 is a schematic structural diagram of an apparatus for power control of an isolated microgrid according to an embodiment of the present application, where, as shown in fig. 5, the apparatus includes: a detection module 500 and a processing module 501, wherein:
the detection module 500: the system is used for determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery and/or a heat storage boiler;
the processing module 501: and the power control unit is used for determining the power of the isolated microgrid according to the operating state of the energy storage device.
In an embodiment, when the energy storage device includes an energy storage battery, the processing module 501 is configured to:
and determining the output power of the power generation device in the isolated microgrid according to the state of charge value of the energy storage battery.
In an embodiment, the processing module 501 is configured to:
and when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, determining the charging power of the energy storage battery according to the state of charge of the energy storage battery, and determining the output power of the power generation device in the isolated microgrid according to the charging power of the energy storage battery.
In an embodiment, the processing module 501 is configured to:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
In an embodiment, the processing module 501 is configured to:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
In an embodiment, the processing module 501 is configured to:
determining the charging power decreasing factor according to the energy storage battery state of charge value, the initial maximum state of charge value and the correlation coefficient of the energy storage battery state of charge value and the charging power decreasing factor;
alternatively, the charging power reduction factor is determined according to a table look-up.
In one embodiment, when the energy storage electrical device comprises an energy storage battery and a heat storage boiler, the processing module 501 is configured to:
determining the preset charging power of the energy storage battery and the preset power of the heat storage boiler, and determining the preset output power of a power generation device in the isolated microgrid according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler; the preset output power of the power generation device is greater than or equal to the sum of the preset charging power of the energy storage battery and the preset power of the heat storage boiler.
In an embodiment, the processing module 501 is further configured to:
when the state of charge value of the energy storage battery is larger than or equal to a preset maximum state of charge value and the residual power of a power generation device in the isolated microgrid is larger than 0, determining the power increase value of the heat storage boiler according to the residual power of the power generation device; and the residual power of the power generation device is the residual power of the output power of the power generation device under the condition of meeting the load power consumption in the isolated micro-grid.
In an embodiment, the processing module 501 is further configured to:
and adjusting the output power of the power generation device in the isolated microgrid according to the isolated microgrid bus frequency.
In practical applications, the detection module 500 and the processing module 501 may be implemented by a processor located in the electronic device, and the processor may be at least one of an ASIC, a DSP, a DSPD, a PLD, an FPGA, a CPU, a controller, a microcontroller, and a microprocessor.
In some embodiments, functions of or modules included in the apparatus provided in the embodiments of the present application may be used to execute the method described in the above method embodiments, and specific implementation thereof may refer to the description of the above method embodiments, and for brevity, will not be described again here.
The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, which are not repeated herein for brevity
The methods disclosed in the method embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in various product embodiments provided by the application can be combined arbitrarily to obtain new product embodiments without conflict.
The features disclosed in the various method or apparatus embodiments provided herein may be combined in any combination to arrive at new method or apparatus embodiments without conflict.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method of power control of an isolated microgrid, the method comprising:
determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery, or the energy storage device comprises an energy storage battery and a heat storage boiler;
determining the power of the isolated microgrid according to the operating state of the energy storage device; wherein, when the energy storage device comprises an energy storage battery, the power of the isolated microgrid comprises: when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, the output power of the power generation device in the isolated microgrid is determined according to the charging power of the energy storage battery, the charging power of the energy storage battery is determined according to a charging power reduction factor, and the charging power reduction factor is determined according to the state of charge value of the energy storage battery, an initial maximum state of charge value and a correlation coefficient between the state of charge value of the energy storage battery and the charging power reduction factor;
when the energy storage device comprises the energy storage battery and the heat storage boiler, and when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, determining the charging power of the energy storage battery according to the state of charge value of the energy storage battery and a corresponding charging power reduction factor, wherein the charging power reduction factor is determined according to the state of charge value of the energy storage battery, an initial maximum state of charge value and a correlation coefficient between the state of charge value of the energy storage battery and the charging power reduction factor.
2. The method of claim 1, wherein determining the power of the isolated microgrid based on an operating state of the energy storage device when the energy storage device comprises an energy storage battery comprises:
and determining the output power of the power generation device in the isolated microgrid according to the state of charge value of the energy storage battery.
3. The method of claim 2, wherein determining the output power of the power generation device in the isolated microgrid from the state of charge of the energy storage battery comprises:
and when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, determining the charging power of the energy storage battery according to the state of charge of the energy storage battery, and determining the output power of the power generation device in the isolated microgrid according to the charging power of the energy storage battery.
4. The method of claim 3, wherein determining the energy storage battery charging power from the state of charge of the energy storage battery comprises:
determining a charging power decreasing factor according to the state of charge value of the energy storage battery, and determining the charging power of the energy storage battery according to the charging power decreasing factor; the charge power decrement factor is used to characterize: a storage battery charging power parameter that decreases as the state of charge value of the storage battery increases.
5. The method of claim 2, further comprising:
and when the state of charge value of the energy storage battery is greater than or equal to a preset maximum state of charge value, stopping charging the energy storage battery.
6. The method of claim 1, wherein determining the power of the isolated microgrid based on the operating state of the energy storage device when the energy storage device comprises an energy storage battery and a heat storage boiler comprises:
determining the preset charging power of the energy storage battery and the preset power of the heat storage boiler, and determining the preset output power of a power generation device in the isolated microgrid according to the preset charging power of the energy storage battery and the preset power of the heat storage boiler; the preset output power of the power generation device is greater than or equal to the sum of the preset charging power of the energy storage battery and the preset power of the heat storage boiler.
7. The method of claim 6, further comprising:
when the state of charge value of the energy storage battery is larger than or equal to a preset maximum state of charge value and the residual power of a power generation device in the isolated microgrid is larger than 0, determining a power increase value of the heat storage boiler according to the residual power of the power generation device; and the residual power of the power generation device is the residual power of the output power of the power generation device under the condition of meeting the load power consumption in the isolated micro-grid.
8. The method of claim 1, wherein determining the power of the isolated microgrid based on the operating state of the energy storage device comprises:
and adjusting the output power of the power generation device in the isolated microgrid according to the isolated microgrid bus frequency.
9. A power control apparatus for an isolated microgrid, the apparatus comprising: detection module and processing module, wherein:
a detection module: the system is used for determining the operating state of an energy storage device in the isolated microgrid; the energy storage device comprises an energy storage battery, or the energy storage device comprises an energy storage battery and a heat storage boiler;
a processing module: the power control device is used for determining the power of the isolated microgrid according to the operating state of the energy storage device; wherein, when the energy storage device comprises an energy storage battery, the power of the isolated microgrid comprises: when the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, the output power of the power generation device in the isolated microgrid is determined according to the charging power of the energy storage battery, the charging power of the energy storage battery is determined according to a charging power reduction factor, and the charging power reduction factor is determined according to the state of charge value of the energy storage battery, an initial maximum state of charge value and a correlation coefficient between the state of charge value of the energy storage battery and the charging power reduction factor;
the processing module is further configured to determine the charging power of the energy storage battery according to the state of charge value of the energy storage battery and a corresponding charging power decrement factor when the energy storage device includes the energy storage battery and the heat storage boiler and the state of charge value of the energy storage battery is smaller than a preset maximum state of charge value, and the charging power decrement factor is determined according to the state of charge value of the energy storage battery, an initial maximum state of charge value and a correlation coefficient between the state of charge value of the energy storage battery and the charging power decrement factor.
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