Micro-grid power generation and utilization balance control method and system

Abstract

The invention provides a micro-grid power generation and utilization balance control method and system, and relates to the field of micro-grid power generation and utilization application, and the method comprises the steps: calculating an electric quantity difference value, and converting the electric energy into potential energy for storage through a pumped storage power station in the next time period under the condition that the electric quantity difference value is greater than a first set value; the environment temperature of the next time period corresponding to the pumped storage power station is obtained, and the predicted electric energy-potential energy conversion capacity is determined according to the environment temperature of the next time period; under the condition that the predicted electric energy-potential energy conversion capacity is smaller than a preset conversion value, a price adjustment notice of lowering the current electricity price in the next time period is sent to the user; and under the condition that the electric quantity difference value is smaller than a second set value, the pumped storage power station is used for converting potential energy into electric energy for power generation. Under the specific power utilization and generation difference value, the reservoir water surface icing risk and the pipeline icing risk are considered, the electric energy-potential energy conversion capacity is monitored in real time in combination with the environment temperature in the next time period, users are stimulated through an electricity price adjusting mechanism, and supply and demand balance is promoted.

Description

Technical Field

[0001] The present invention relates to the application field of power generation and consumption in a microgrid, and in particular to a power generation and consumption balance control method and system for a microgrid. Background Art

[0002] Photovoltaic power generation is intermittent, that is, it can only generate electricity when there is sufficient sunlight, and the amount of power generated is greatly affected by the weather. Pumped storage power generation can use excess electricity to pump water from low places to high reservoirs for storage when electricity demand is low; when electricity demand peaks, the water is released to generate electricity through turbines, thereby realizing the storage and release of electricity. Combining photovoltaic power generation with pumped storage power generation can form a stable power supply system. Photovoltaic power generation generates electricity when there is sufficient sunlight to meet part of the electricity demand; excess electricity is stored in pumped storage power stations. When photovoltaic power generation is insufficient, pumped storage power stations can release stored electricity to ensure a continuous supply of electricity.

[0003] However, when such a micro power station is established in areas with severe winters, the efficiency of pumped storage will be reduced due to ice on the reservoir surface and ice in the pipelines, which will require more additional energy for the energy conversion from electrical energy to potential energy, ultimately leading to a large amount of electrical energy waste, thus losing the original intention of establishing a power supply system based on photovoltaic power generation systems and pumped storage power generation systems, which is not worth the loss.

[0004] However, there is currently no technical solution that can solve the above technical problems, and there is no method and system for controlling the power generation and consumption balance of a microgrid. Summary of the invention

[0005] The present invention provides a method and system for controlling the power generation and consumption balance of a microgrid. By predicting the power consumption and power generation in the next period, the mutual conversion control between the photovoltaic power generation microstation and the pumped storage power station in the next period is given, and the influence of the current ambient temperature on the electric energy-potential energy conversion capacity is combined to realize the power generation balance control of the microgrid.

[0006] In a first aspect, the present invention provides a method for controlling power generation and consumption balance in a microgrid, comprising: Calculate the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, and generate a first control instruction when the power difference is greater than a first set value, wherein the first control instruction is used to convert the electrical energy into potential energy for storage in the next period by using a pumped storage power station associated with the photovoltaic power generation micro-station; When the electric quantity difference is less than or equal to the first set value, and when the electric quantity difference is greater than or equal to the second set value, obtaining the ambient temperature of the next time period corresponding to the pumped-storage power station, and determining the estimated electric energy-potential energy conversion capacity according to the ambient temperature of the next time period; When the estimated electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, the first control instruction is generated; when the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next period; When the power difference is less than the second set value, a third control instruction is generated, wherein the third control instruction is used to convert potential energy into electrical energy for power generation by using a pumped storage power station associated with the photovoltaic power generation micro power station in the next time period; The first setting value is greater than the second setting value.

[0007] According to the microgrid power generation and consumption balance control method provided by the present invention, before calculating the power difference between the power generation of the photovoltaic power generation microstation in the next period and the expected power consumption in the next period, the method also includes: Acquire the current system operating parameters of the photovoltaic power generation micro-station and the meteorological data of the next period, wherein the meteorological data includes at least one of solar radiation, temperature, humidity, wind speed, and wind direction; the current system operating parameters include at least one of power generation power, voltage, current, photovoltaic panel efficiency, irradiance, and inverter conversion efficiency; Input the current system operating parameters and the meteorological data into a preset power consumption prediction model to obtain the power generation of the photovoltaic power generation micro-station in the next period output by the preset power consumption prediction model; The preset electricity consumption prediction model is determined after training based on all historical meteorological data samples and historical system operation parameter samples, as well as the historical power generation corresponding to each historical meteorological data sample and historical system operation parameter sample.

[0008] According to the microgrid power generation and consumption balance control method provided by the present invention, before calculating the power difference between the power generation of the photovoltaic power generation microstation in the next period and the expected power consumption in the next period, the method also includes: Obtaining each actual power consumption corresponding to each historical period in each historical year, the starting point to the end point of the next period corresponds to the starting point to the end point of the historical period; Eliminate the maximum and minimum values ​​of all actual power consumption to obtain all power consumption after elimination; All the eliminated electricity consumption is averaged to obtain the historical electricity consumption average, and the historical electricity consumption average is determined as the estimated electricity consumption for the next period.

[0009] According to the microgrid power generation and consumption balance control method provided by the present invention, the step of obtaining the ambient temperature of the next period corresponding to the pumped storage power station and determining the expected electric energy-potential energy conversion capacity according to the ambient temperature of the next period includes: Obtaining the ambient temperature of the next period corresponding to the pumped-storage power station from the current weather forecast data; Processing the ambient temperature of the next period of time according to a preset formula to obtain the estimated electric energy-potential energy conversion capacity; The estimated electric energy-potential energy conversion capacity is determined based on the pumping flow rate and the water pump efficiency. The pumping flow rate is determined based on the comprehensive freezing risk. The comprehensive freezing risk includes the reservoir water surface freezing risk and the pipeline freezing risk.

[0010] According to the microgrid power generation and consumption balance control method provided by the present invention, the ambient temperature of the next period is processed according to a preset formula to obtain the expected electric energy-potential energy conversion capacity, including: ; in, To estimate the electric energy-potential energy conversion capacity, is the preset constant term, is the pump efficiency, is the maximum pumping flow rate when there is no ice, is the preset coefficient of the effect of freezing on the pumping flow, is the preset slope parameter, is the ambient temperature for the next period, The preset temperature threshold at which the risk of icing begins to increase significantly.

[0011] According to the microgrid power generation and consumption balance control method provided by the present invention, before generating the second control instruction, the method further includes: Get the current electricity price; The reduced electricity price is determined according to the estimated electric energy-potential energy conversion capacity and the current electricity price, so as to generate a second control instruction according to the reduced electricity price.

[0012] According to the microgrid power generation and consumption balance control method provided by the present invention, the lowered electricity price is determined based on the expected electric energy-potential energy conversion capacity and the current electricity price, including: ; in, To reduce the electricity price, is the current electricity price, is the first preset price adjustment coefficient, To estimate the electrical energy-potential energy conversion capacity.

[0013] According to the microgrid power generation and consumption balance control method provided by the present invention, generating the third control instruction includes: Get the current electricity price; Determining an increased electricity price based on the electricity quantity difference and the current electricity price; Generate a third control instruction, which is used to utilize the pumped storage power station associated with the photovoltaic power generation micro power station to convert potential energy into electrical energy for power generation in the next time period, and send a price adjustment notice to the user to increase the current electricity price in the next time period based on the increased electricity price.

[0014] According to the microgrid power generation and consumption balance control method provided by the present invention, the increased electricity price is determined according to the power difference and the current electricity price, including: ; in, After the increase in electricity prices, is the current electricity price, is the second preset price adjustment coefficient, is the absolute value of the power difference.

[0015] In a second aspect, a microgrid power generation and consumption balance control system is provided, comprising: A calculation unit, the calculation unit is used to calculate the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, and generate a first control instruction when the power difference is greater than a first set value, the first control instruction is used to convert the electric energy into potential energy for storage in the next period by using the pumped storage power station associated with the photovoltaic power generation micro-station; A determination unit, the determination unit is used to obtain the ambient temperature of the next period corresponding to the pumped-storage power station when the power difference is less than or equal to the first set value and when the power difference is greater than or equal to the second set value, and determine the expected electric energy-potential energy conversion capacity according to the ambient temperature of the next period; a first generating unit, the first generating unit being used to generate the first control instruction when the estimated electric energy-potential energy conversion capacity is greater than or equal to a preset conversion value; and to generate a second control instruction when the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, the second control instruction being used to send a price adjustment notice to the user for lowering the current electricity price in the next period; a second generating unit, the second generating unit being used to generate a third control instruction when the power difference is less than the second set value, the third control instruction being used to convert potential energy into electrical energy for generating electricity in the next time period by using a pumped storage power station associated with the photovoltaic power generation micro power station; The first setting value is greater than the second setting value.

[0016] The present invention provides a microgrid power generation and consumption balance control method and system, which realizes different balance control strategies under different power generation and power consumption requirements, especially under specific power consumption and power generation difference, taking into account the risk of ice formation on the reservoir surface and the risk of ice formation on the pipeline, and can monitor the power-potential energy conversion capacity in real time in combination with the ambient temperature in the next period, and then use the electricity price adjustment mechanism to encourage users to participate in the adjustment and promote the balance between supply and demand; The present invention realizes the dynamic balance of power generation and consumption in the microgrid. It not only improves the stability and reliability of the system through the flexible scheduling of the pumped storage power station, but also calculates the reduction range of the current electricity price by predicting the electric energy-potential energy conversion capacity, thereby encouraging users to use electricity and alleviating the problem of excess electricity. It also calculates the increase range of the current electricity price through the difference in electricity quantity, thereby encouraging users to save electricity. It not only further promotes the balance between supply and demand, but also improves the flexibility and response capability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of a microgrid power generation and consumption balance control method provided by the present invention; Figure 2 It is a structural schematic diagram of a microgrid power generation and consumption balance control system provided by the present invention; Figure 3 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Figure 1 The present invention provides a flow chart of a microgrid power generation and consumption balance control method, wherein the microgrid power generation and consumption balance control method comprises: Step 101, calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, and generating a first control instruction when the power difference is greater than a first set value, wherein the first control instruction is used to convert electrical energy into potential energy for storage in the next period by using a pumped storage power station associated with the photovoltaic power generation micro-station; Step 102: when the power difference is less than or equal to the first set value, and when the power difference is greater than or equal to the second set value, obtaining the ambient temperature of the next period corresponding to the pumped-storage power station, and determining the estimated electric energy-potential energy conversion capacity according to the ambient temperature of the next period; Step 103: if the estimated electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, generate the first control instruction; if the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, generate the second control instruction, the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next period; Step 104: when the power difference is less than the second set value, generate a third control instruction, wherein the third control instruction is used to convert potential energy into electrical energy for power generation by using the pumped storage power station associated with the photovoltaic power generation micro power station in the next period of time; The first setting value is greater than the second setting value.

[0021] In step 101, the microgrid is an electricity consumption and power generation system composed of the photovoltaic power generation micropower station and the pumped storage power station. The present invention aims to seek a balance between power generation and consumption in the microgrid through the technical solution of the present application. Specifically, the present invention first uses historical data, weather forecasts, performance parameters of the photovoltaic power generation system and other information to calculate the power generation of the photovoltaic power generation micropower station in the next time period through a prediction algorithm. At the same time, combined with historical power consumption data, user power consumption behavior analysis and possible future changes in power demand, the expected power consumption in the next time period is predicted. Subsequently, the system calculates the difference in power between the two predicted values. If the power difference is greater than the preset first set value, it is considered that the power generation in the next time period is still in a very sufficient situation after considering the corresponding power consumption situation. At this time, the first control instruction is automatically generated for converting electrical energy into potential energy for storage in the next time period using the pumped storage power station associated with the photovoltaic power generation micropower station.

[0022] Optionally, the present invention can ensure that when there is excess photovoltaic power generation, pumped storage power stations are used to store electricity in a timely manner to avoid energy waste by calculating the power difference in advance and determining whether energy storage is needed. When photovoltaic power generation is insufficient, the stored potential energy can be converted into electrical energy to provide stable power support for the power grid.

[0023] Optionally, before calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, the method further includes: Acquire the current system operating parameters of the photovoltaic power generation micro-station and the meteorological data of the next period, wherein the meteorological data includes at least one of solar radiation, temperature, humidity, wind speed, and wind direction; the current system operating parameters include at least one of power generation power, voltage, current, photovoltaic panel efficiency, irradiance, and inverter conversion efficiency; Input the current system operating parameters and the meteorological data into a preset power consumption prediction model to obtain the power generation of the photovoltaic power generation micro-station in the next period output by the preset power consumption prediction model; The preset electricity consumption prediction model is determined after training based on all historical meteorological data samples and historical system operation parameter samples, as well as the historical power generation corresponding to each historical meteorological data sample and historical system operation parameter sample.

[0024] Optionally, before calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the expected power consumption in the next period, in order to more accurately predict the power generation of the photovoltaic power generation micro-station, the present technical solution introduces additional steps to collect and process relevant data, and predict the power generation in the next period according to a preset power consumption prediction model. Specifically, the current operating parameters of the photovoltaic power generation micro-station are obtained in real time, including but not limited to power generation power, voltage, current, photovoltaic panel efficiency, irradiance, inverter conversion efficiency, which can be any one or more of them. The meteorological data of the next period including solar radiation, temperature, humidity, wind speed and wind direction are obtained through a meteorological station, a meteorological forecast system or other reliable data sources. It can be any one or more of them. Based on all historical meteorological data samples and historical system operating parameter samples, as well as the historical power generation corresponding to each historical sample, the preset power consumption prediction model is determined after training, so that the collected current system operating parameters and the meteorological data of the next period are used as input. After input into the preset power consumption prediction model, the power generation of the photovoltaic power generation micro-station in the next period is obtained. The present invention introduces the current system operating parameters and the meteorological data of the next period, and combines it with a preset power consumption prediction model for prediction, which can significantly improve the prediction accuracy of the power generation of photovoltaic micro-stations and provide data support for subsequent micro-grid power generation and consumption balance control.

[0025] Optionally, before calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, the method further includes: Obtaining each actual power consumption corresponding to each historical period in each historical year, the starting point to the end point of the next period corresponds to the starting point to the end point of the historical period; Eliminate the maximum and minimum values ​​of all actual power consumption to obtain all power consumption after elimination; All the eliminated electricity consumption is averaged to obtain the historical electricity consumption average, and the historical electricity consumption average is determined as the estimated electricity consumption for the next period.

[0026] Optionally, before calculating the difference between the power generation of the photovoltaic micro-station in the next period and the expected power consumption in the next period, it is also necessary to obtain the expected power consumption in the next period. Specifically, first obtain the actual power consumption data of the historical period corresponding to the starting point to the end point of the next period in each historical year. These data constitute the basis for predicting the power consumption in the next period. In the collected historical power consumption data, there may be some extreme values ​​(such as maximum and minimum values). These values ​​may be caused by special events (such as natural disasters, large-scale activities, system failures, etc.) and are not representative. Therefore, these extreme values ​​need to be eliminated to eliminate their impact on the prediction results; then the power consumption after elimination is averaged. In this scenario, the average value of all eliminated power consumption is calculated to obtain the historical power consumption mean. The historical power consumption mean represents the average level of power consumption in the historical period without interference from extreme events. Finally, the historical power consumption mean that conforms to the objective statistical laws is determined as the expected power consumption in the next period.

[0027] In other embodiments, the present invention may also consider constraints such as power supply and demand balance, electricity price elasticity on the electricity consumption side, and energy loss of the energy storage system. With the maximum photovoltaic utilization rate and the maximum annual net profit as the goals, the present invention performs calculations on the flow, short circuit, line loss, harmonics, reactive voltage, etc. on the low-carbon camp microgrid system, predicts the load and power generation, and then determines the power generation of the photovoltaic power generation micro-station in the next period and the expected power consumption in the next period. Then, based on energy management calculation and analysis, the microgrid is guided to operate more reasonably and economically, and the power generation and power consumption demand are reasonably adjusted and controlled. The power generation side and the user side are managed and controlled to achieve power generation and power consumption balance control under the isolated grid operation state.

[0028] In step 102, when the power difference is less than or equal to the first set value, and when the power difference is greater than or equal to the second set value, it is considered that the power difference of the next time period estimated at this time is still at a stage where the expected power generation is greater than the expected power consumption, but because the power difference is not sufficient, it is necessary to further analyze whether it is necessary to use the pumped storage power station associated with the photovoltaic power generation micro power station to convert electric energy into potential energy. Considering the problem that when the micro power station is operated in areas with severe winter, the water surface of the reservoir and the pipeline are frozen, resulting in reduced pumped storage efficiency, in order to ensure that no more additional energy is consumed for the energy conversion from electric energy to potential energy and to ensure that a large amount of electric energy will not be wasted in the end, the present invention obtains the ambient temperature of the next time period corresponding to the pumped storage power station, and determines the expected electric energy-potential energy conversion capacity according to the ambient temperature of the next time period.

[0029] Optionally, the first set value is greater than the second set value. When the power difference is between the first set value and the second set value, the ambient temperature of the next time period at the location of the pumped-storage power station is further obtained. The ambient temperature has a significant impact on the working efficiency of the pumped-storage power station, such as affecting the fluidity of water and the working efficiency of equipment. The system calculates the expected electric energy-potential energy conversion capacity based on the ambient temperature data and the performance parameters of the pumped-storage power station. The obtaining of the ambient temperature of the next time period corresponding to the pumped-storage power station and determining the expected electric energy-potential energy conversion capacity based on the ambient temperature of the next time period include: Obtaining the ambient temperature of the next period corresponding to the pumped-storage power station from the current weather forecast data; Processing the ambient temperature of the next period of time according to a preset formula to obtain the estimated electric energy-potential energy conversion capacity; The estimated electric energy-potential energy conversion capacity is determined based on the pumping flow rate and the water pump efficiency. The pumping flow rate is determined based on the comprehensive freezing risk. The comprehensive freezing risk includes the reservoir water surface freezing risk and the pipeline freezing risk.

[0030] Optionally, the predicted ambient temperature value for the next time period (such as the next few hours, a day or a week) of the geographical location of the pumped-storage power station is extracted through the corresponding data call interface of the meteorological bureau, file transfer or direct query of the database, and based on the physical characteristics and operation experience of the pumped-storage power station, a mathematical relationship model between the ambient temperature and the electric energy-potential energy conversion capacity is established, and the reasonable pumping flow rate is determined by comprehensively considering factors such as reservoir water volume, power grid demand, and comprehensive freezing risk, wherein the comprehensive freezing risk includes the risk of reservoir water surface freezing and pipeline freezing, which need to be quantitatively analyzed through a special evaluation model or method. Optionally, the mathematical relationship model is the preset formula, which comprehensively considers the influence of ambient temperature on factors such as water pump efficiency and water flow velocity. According to the actual operation data and test results of the pumped-storage power station, the relevant parameters in the preset formula are calibrated and optimized to improve the accuracy of the prediction, and the predicted ambient temperature value for the next time period is substituted into the preset formula for calculation and processing to obtain the expected electric energy-potential energy conversion capacity.

[0031] Optionally, the ambient temperature of the next period is processed according to a preset formula to obtain the estimated electric energy-potential energy conversion capacity, including: ; (1) in, To estimate the electric energy-potential energy conversion capacity, is the preset constant term, is the pump efficiency, is the maximum pumping flow rate when there is no ice, is the preset coefficient of the effect of freezing on the pumping flow, is the preset slope parameter, is the ambient temperature for the next period, The preset temperature threshold at which the risk of icing begins to increase significantly.

[0032] In step 103, when the expected electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, it is considered that the expected electric energy-potential energy conversion capacity is relatively strong at this time, and the pumped storage power station associated with the photovoltaic power generation micro power station can be used in the next time period to convert electric energy into potential energy for storage, that is, to generate the first control instruction, and will not cause a large amount of energy waste, and convert electric energy into potential energy for storage to meet subsequent power supply needs.

[0033] Optionally, when the expected electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next time period. That is, when the present invention determines that the expected electric energy-potential energy conversion capacity is less than the preset conversion value and the energy consumption after conversion is high, the pumped storage power station associated with the photovoltaic power generation micro power station is not used to convert electric energy into potential energy for storage. Instead, the possible remaining electric energy is used to encourage residents to use it reasonably in the next time period. Without causing energy waste, decisions that benefit the people are made, the residents' electricity experience is improved, and users are guided to use electricity reasonably through electricity price adjustments to achieve a balance between supply and demand.

[0034] Optionally, before generating the second control instruction, the method further includes: Get the current electricity price; The reduced electricity price is determined according to the estimated electric energy-potential energy conversion capacity and the current electricity price, so as to generate a second control instruction according to the reduced electricity price.

[0035] Optionally, determining the reduced electricity price according to the estimated electric energy-potential energy conversion capacity and the current electricity price includes: ; (2) in, To reduce the electricity price, is the current electricity price, is the first preset price adjustment coefficient, To estimate the electrical energy-potential energy conversion capacity.

[0036] In such an embodiment, the stronger the expected electric energy-potential energy conversion capacity is, the smaller the reduction in electricity price will be; the weaker the expected electric energy-potential energy conversion capacity is, the higher the current comprehensive freezing risk is. At this time, by lowering the electricity price by a certain amount, residents can be encouraged to plan their electricity consumption in the next period in advance. The higher the current comprehensive freezing risk is, the greater the incentive will be; the lower the current comprehensive freezing risk is, the smaller the incentive will be. The present invention dynamically adjusts the electricity price according to the current electricity price and the expected electric energy-potential energy conversion capacity to optimize energy utilization and cost control.

[0037] Step 104: When the power difference is less than the second set value, it means that the expected power generation of the photovoltaic micro-power station in the next time period may not be sufficient to meet the expected power consumption, and there is a power consumption gap. In order to balance the supply and demand relationship, improve energy utilization efficiency and possibly reduce costs, the present invention generates a third control instruction, and the third control instruction is used to utilize the pumped storage power station associated with the photovoltaic micro-power station in the next time period to convert potential energy into electrical energy for power generation to fill the power consumption gap.

[0038] During the power generation process of the pumped-storage power station, the generated electric energy can be directly supplied to the area served by the photovoltaic micro-power station. In this way, even if the power generation of the photovoltaic micro-power station is not enough to meet the demand, the pumped-storage power station can be used to supplement the power supply to ensure a stable supply of electricity. During the whole process, the present invention can also continuously monitor the operating status of the photovoltaic micro-power station and the pumped-storage power station and the supply and demand of the power grid. If any abnormal situation or change in the supply and demand relationship is found, the control instructions can be adjusted in time or other measures can be taken to ensure a stable supply of electricity and efficient use of energy.

[0039] Optionally, generating a third control instruction includes: Get the current electricity price; Determining an increased electricity price based on the electricity quantity difference and the current electricity price; Generate a third control instruction, which is used to utilize the pumped storage power station associated with the photovoltaic power generation micro power station to convert potential energy into electrical energy for power generation in the next time period, and send a price adjustment notice to the user to increase the current electricity price in the next time period based on the increased electricity price.

[0040] Optionally, determining the increased electricity price according to the electricity quantity difference and the current electricity price includes: ; (3) in, After the increase in electricity prices, is the current electricity price, is the second preset price adjustment coefficient, is the absolute value of the power difference.

[0041] The present invention not only considers the collaborative work between the photovoltaic power generation micro-station and the pumped storage power station, but also introduces an electricity price adjustment mechanism to deal with the situation where the power difference is less than the second set value, aiming to balance the supply and demand relationship and encourage users to adjust their electricity consumption behavior. Specifically, the larger the absolute value of the power difference, the larger the power consumption gap. Correspondingly, the larger the increase in electricity price, the smaller the absolute value of the power difference, the smaller the power consumption gap, and the smaller the increase in electricity price. The setting of the second preset price adjustment coefficient in the present invention should take into account the user's acceptance to avoid excessive price adjustments that lead to user dissatisfaction.

[0042] Figure 2It is a structural schematic diagram of a microgrid power generation and consumption balance control system provided by the present invention, wherein the microgrid power generation and consumption balance control system comprises a calculation unit 1, wherein the calculation unit is used to calculate the difference between the power generation of the photovoltaic micropower station in the next time period and the estimated power consumption in the next time period, and when the power difference is greater than a first set value, a first control instruction is generated, wherein the first control instruction is used to utilize a pumped storage power station associated with the photovoltaic micropower station in the next time period to convert electrical energy into potential energy for storage, and the working principle of the calculation unit 1 can refer to the aforementioned step 101 and will not be elaborated here.

[0043] The microgrid power generation and consumption balance control system also includes a determination unit 2, which is used to obtain the ambient temperature of the next time period corresponding to the pumped-storage power station when the power difference is less than or equal to a first set value and when the power difference is greater than or equal to a second set value, and determine the expected electric energy-potential energy conversion capacity according to the ambient temperature of the next time period. The working principle of the determination unit 2 can refer to the aforementioned step 102 and will not be repeated here.

[0044] The microgrid power generation and consumption balance control system also includes a first generating unit 3, which is used to generate the first control instruction when the expected electric energy-potential energy conversion capacity is greater than or equal to a preset conversion value; and to generate a second control instruction when the expected electric energy-potential energy conversion capacity is less than a preset conversion value. The second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price for the next time period. The working principle of the first generating unit 3 can refer to the aforementioned step 103 and will not be repeated here.

[0045] The microgrid power generation and consumption balance control system also includes a second generation unit 4, which is used to generate a third control instruction when the power difference is less than the second set value. The third control instruction is used to use the pumped storage power station associated with the photovoltaic power generation micro power station to convert potential energy into electrical energy for power generation in the next time period. The working principle of the second generation unit 4 can refer to the aforementioned step 104 and will not be repeated here.

[0046] The first setting value is greater than the second setting value.

[0047] The present invention provides a microgrid power generation and consumption balance control method and system, which implement different balance control strategies under different power generation and power consumption demands, especially under specific power consumption and power generation difference, taking into account the risk of ice formation on the reservoir surface and the risk of ice formation on the pipeline, and can monitor the electric energy-potential energy conversion capacity in real time in combination with the ambient temperature of the next period, and then use the electricity price adjustment mechanism to encourage users to participate in the adjustment, so as to promote the balance between supply and demand; the present invention realizes the dynamic balance between power generation and consumption of the microgrid, not only improves the stability and reliability of the system through the flexible scheduling of the pumped storage power station, but also calculates the current electricity price reduction range by estimating the electric energy-potential energy conversion capacity, encourages users to use electricity, and alleviates the problem of excess electricity; it also calculates the current electricity price increase range by the power difference, and encourages users to save electricity, which not only further promotes the balance between supply and demand, but also improves the flexibility and response capability of the power system.

[0048] Figure 3 Schematic diagram of the structure of the electronic device provided by the present invention. Figure 3 As shown, the electronic device may include: a processor 310, a communications interface 320, a memory 330 and a communication bus 340, wherein the processor 310, the communications interface 320 and the memory 330 communicate with each other through the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to execute the microgrid power generation and consumption balance control method, the method comprising: calculating the power difference between the power generation of the photovoltaic power generation microstation in the next period and the expected power consumption in the next period, and generating a first control instruction when the power difference is greater than a first set value, the first control instruction is used to convert the electric energy into potential energy for storage in the next period by using the pumped storage power station associated with the photovoltaic power generation microstation; when the power difference is less than or equal to the first set value, and when the power difference is greater than or equal to the second set value, obtaining the next period of the ambient temperature corresponding to the pumped storage power station, and according to the The estimated electric energy-potential energy conversion capacity is determined based on the ambient temperature in the next time period; when the estimated electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, the first control instruction is generated; when the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user for lowering the current electricity price in the next time period; when the power difference is less than the second set value, a third control instruction is generated, and the third control instruction is used to convert potential energy into electric energy for power generation in the next time period using the pumped storage power station associated with the photovoltaic power generation micro power station; the first set value is greater than the second set value.

[0049] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0050] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a microgrid power generation and consumption balance control method provided by the above methods, the method including: calculating the difference between the power generation of the photovoltaic power generation micropower station in the next time period and the expected power consumption in the next time period, and when the power difference is greater than a first set value, generating a first control instruction, the first control instruction is used to use the pumped storage power station associated with the photovoltaic power generation micropower station to convert electrical energy into potential energy for storage in the next time period; when the power difference is less than or equal to the first set value, and the power difference is greater than or equal to the first set value In the case of two set values, the ambient temperature of the next time period corresponding to the pumped-storage power station is obtained, and the expected electric energy-potential energy conversion capacity is determined according to the ambient temperature of the next time period; when the expected electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, the first control instruction is generated; when the expected electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next time period; when the electricity difference is less than the second set value, a third control instruction is generated, and the third control instruction is used to convert potential energy into electric energy for power generation in the next time period using the pumped-storage power station associated with the photovoltaic micro power station; the first set value is greater than the second set value.

[0051] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the microgrid power generation and consumption balance control method provided by the above-mentioned methods, the method comprising: calculating the difference between the power generation of the photovoltaic power generation microstation in the next time period and the expected power consumption in the next time period, and generating a first control instruction when the power difference is greater than a first set value, the first control instruction being used to convert electrical energy into potential energy for storage by using a pumped-storage power station associated with the photovoltaic power generation microstation in the next time period; and obtaining the pumped-storage power station when the power difference is less than or equal to the first set value and when the power difference is greater than or equal to the second set value. The ambient temperature of the next time period corresponding to the photovoltaic power station is determined, and the expected electric energy-potential energy conversion capacity is determined according to the ambient temperature of the next time period; when the expected electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, the first control instruction is generated; when the expected electric energy-potential energy conversion capacity is less than the preset conversion value, the second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next time period; when the power difference is less than the second set value, a third control instruction is generated, and the third control instruction is used to convert potential energy into electric energy for power generation in the next time period using the pumped storage power station associated with the photovoltaic power generation micro power station; the first set value is greater than the second set value.

[0052] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0053] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A microgrid power generation and consumption balance control method, characterized in that: include: Calculate the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, and generate a first control instruction when the power difference is greater than a first set value, wherein the first control instruction is used to convert the electrical energy into potential energy for storage in the next period by using a pumped storage power station associated with the photovoltaic power generation micro-station; When the electric quantity difference is less than or equal to the first set value, and when the electric quantity difference is greater than or equal to the second set value, obtaining the ambient temperature of the next time period corresponding to the pumped-storage power station, and determining the estimated electric energy-potential energy conversion capacity according to the ambient temperature of the next time period; When the estimated electric energy-potential energy conversion capacity is greater than or equal to the preset conversion value, the first control instruction is generated; when the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, and the second control instruction is used to send a price adjustment notice to the user to reduce the current electricity price in the next period; When the power difference is less than the second set value, a third control instruction is generated, wherein the third control instruction is used to convert potential energy into electrical energy for power generation by using a pumped storage power station associated with the photovoltaic power generation micro power station in the next time period; The first setting value is greater than the second setting value.

2. The microgrid power generation and consumption balance control method according to claim 1, characterized in that: Before calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, the method further includes: Acquire the current system operating parameters of the photovoltaic power generation micro-station and the meteorological data of the next period, wherein the meteorological data includes at least one of solar radiation, temperature, humidity, wind speed, and wind direction; the current system operating parameters include at least one of power generation power, voltage, current, photovoltaic panel efficiency, irradiance, and inverter conversion efficiency; Input the current system operating parameters and the meteorological data into a preset power consumption prediction model to obtain the power generation of the photovoltaic power generation micro-station in the next period output by the preset power consumption prediction model; The preset electricity consumption prediction model is determined after training based on all historical meteorological data samples and historical system operation parameter samples, as well as the historical power generation corresponding to each historical meteorological data sample and historical system operation parameter sample.

3. The microgrid power generation and consumption balance control method according to claim 1, characterized in that: Before calculating the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, the method further includes: Obtaining each actual power consumption corresponding to each historical period in each historical year, the starting point to the end point of the next period corresponds to the starting point to the end point of the historical period; Eliminate the maximum and minimum values ​​of all actual power consumption to obtain all power consumption after elimination; All the eliminated electricity consumption is averaged to obtain the historical electricity consumption average, and the historical electricity consumption average is determined as the estimated electricity consumption for the next period.

4. The microgrid power generation and consumption balance control method according to claim 1, characterized in that: The step of obtaining the ambient temperature of the pumped storage power station in the next period of time, and determining the estimated electric energy-potential energy conversion capacity according to the ambient temperature of the next period of time, comprises: Obtaining the ambient temperature of the next period corresponding to the pumped-storage power station from the current weather forecast data; Processing the ambient temperature of the next period of time according to a preset formula to obtain the estimated electric energy-potential energy conversion capacity; The estimated electric energy-potential energy conversion capacity is determined based on the pumping flow rate and the water pump efficiency. The pumping flow rate is determined based on the comprehensive freezing risk. The comprehensive freezing risk includes the reservoir water surface freezing risk and the pipeline freezing risk.

5. The microgrid power generation and consumption balance control method according to claim 4, characterized in that: The ambient temperature of the next period is processed according to a preset formula to obtain the estimated electric energy-potential energy conversion capacity, including: ； in, To estimate the electric energy-potential energy conversion capacity, is the preset constant term, is the pump efficiency, is the maximum pumping flow rate when there is no ice, is the preset coefficient of the effect of freezing on the pumping flow, is the preset slope parameter, is the ambient temperature for the next period, The preset temperature threshold at which the risk of icing begins to increase significantly.

6. The microgrid power generation and consumption balance control method according to claim 1, characterized in that: Before generating the second control instruction, the method further includes: Get the current electricity price; The reduced electricity price is determined according to the estimated electric energy-potential energy conversion capacity and the current electricity price, so as to generate a second control instruction according to the reduced electricity price.

7. The microgrid power generation and consumption balance control method according to claim 6, characterized in that: The step of determining the reduced electricity price based on the estimated electric energy-potential energy conversion capacity and the current electricity price includes: ； in, To reduce the electricity price, is the current electricity price, is the first preset price adjustment coefficient, To estimate the electrical energy-potential energy conversion capacity.

8. The microgrid power generation and consumption balance control method according to claim 1, characterized in that: The generating of the third control instruction comprises: Get the current electricity price; Determining an increased electricity price based on the electricity quantity difference and the current electricity price; Generate a third control instruction, which is used to utilize the pumped storage power station associated with the photovoltaic power generation micro power station to convert potential energy into electrical energy for power generation in the next time period, and send a price adjustment notice to the user to increase the current electricity price in the next time period based on the increased electricity price.

9. The microgrid power generation and consumption balance control method according to claim 8, characterized in that: The step of determining the increased electricity price according to the electricity quantity difference and the current electricity price includes: ； in, After the increase in electricity prices, is the current electricity price, is the second preset price adjustment coefficient, is the absolute value of the power difference.

10. A microgrid power generation and consumption balance control system, characterized in that: include: A calculation unit, the calculation unit is used to calculate the difference between the power generation of the photovoltaic power generation micro-station in the next period and the estimated power consumption in the next period, and generate a first control instruction when the power difference is greater than a first set value, the first control instruction is used to convert the electric energy into potential energy for storage in the next period by using the pumped storage power station associated with the photovoltaic power generation micro-station; A determination unit, the determination unit is used to obtain the ambient temperature of the next period corresponding to the pumped-storage power station when the power difference is less than or equal to the first set value and when the power difference is greater than or equal to the second set value, and determine the expected electric energy-potential energy conversion capacity according to the ambient temperature of the next period; a first generating unit, the first generating unit being configured to generate the first control instruction when the estimated electric energy-potential energy conversion capability is greater than or equal to a preset conversion value; When the estimated electric energy-potential energy conversion capacity is less than the preset conversion value, a second control instruction is generated, wherein the second control instruction is used to send a price adjustment notice to the user for lowering the current electricity price in the next period; a second generating unit, the second generating unit being used to generate a third control instruction when the power difference is less than the second set value, the third control instruction being used to convert potential energy into electrical energy for generating electricity in the next time period by using a pumped storage power station associated with the photovoltaic power generation micro power station; The first setting value is greater than the second setting value.

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