Variable-power wind-solar complementary energy supply system and method capable of distinguishing renewable energy intensity

Abstract

The invention relates to the technical field of photovoltaic heating, in particular to a variable-power wind-solar complementary energy supply system and method for distinguishing renewable energy intensity, and the system comprises a system control module which is used for formulating a variable-power consumption strategy for distinguishing the renewable energy intensity, and the renewable energy power input into the energy consumption module is dynamically allocated based on a variable power consumption strategy, so that wind-solar complementary energy supply is performed on the energy consumption module, and the renewable energy power generation power and the power of the resistive heating tail end in the energy consumption module are matched in real time. The variable-power wind-solar complementary energy supply system capable of distinguishing the renewable energy intensity is constructed by utilizing the characteristics that the resistive heating tail end can work with variable heat production power and the storage battery can be efficiently charged under the low renewable energy intensity, and a control strategy of storage power consumption in weak wind and weak irradiation time periods and energy consumption consumption in strong wind and strong irradiation time periods is put forward; the situation that low voltage of the system is converted into invalid low-grade heat energy is avoided, and the utilization efficiency of renewable energy sources is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic heating technology, and specifically to a variable power wind-solar complementary energy supply system and method for distinguishing the intensity of renewable energy. Background Art

[0002] Heating energy consumption in buildings in extremely cold regions accounts for over 70% of all building energy consumption, making it the primary energy source. Off-grid utilization of renewable energy sources, such as solar photovoltaics and wind power, is an effective solution for addressing heating and power supply issues in these regions. Fluctuating solar and wind power levels cause the generation capacity of renewable energy systems to fluctuate. Traditional constant-power heating systems (such as heat pumps and air conditioning units) require additional mains power, resulting in energy costs and hindering system adoption. For example, when a constant-power heating system's load is inconsistent with the PV system's generated power, batteries or mains power are required to maintain a constant operating power level. This inevitably leads to increased mains power consumption and energy waste.

[0003] Resistive heating terminals can operate at varying power levels in off-grid renewable energy systems, but their thermal energy quality varies with the intensity of renewable energy, affecting their heating effectiveness. Batteries, a common energy storage device in renewable energy systems, are suitable for operating at low power levels. They can effectively utilize low-intensity renewable energy, converting it into high-quality electricity for powering homes. Summary of the Invention

[0004] This application provides a variable-power wind-solar hybrid energy supply system and method that differentiates renewable energy intensity. By leveraging the variable heat production power of resistive heating terminals and the efficient charging of batteries at low renewable energy intensities, a variable-power wind-solar hybrid energy supply system that differentiates renewable energy intensity is constructed. A control strategy of "storing electricity during periods of weak wind and radiation, and consuming energy during periods of strong wind and radiation" is proposed. This strategy avoids the conversion of ineffective, low-quality thermal energy into low-voltage power during low-voltage periods, thereby improving the efficiency of renewable energy utilization.

[0005] In a first aspect, an embodiment of the present application provides a variable power wind-solar hybrid energy supply system that differentiates the intensity of renewable energy, including: An energy input module, used for providing energy input; an electric energy storage module, used to store the electric energy provided by the energy input module; an energy consumption module, configured to consume the electrical energy provided by the energy input module; a system control module for formulating a variable power consumption strategy that differentiates the intensity of renewable energy, and dynamically allocating the renewable energy power input to the energy consumption module based on the variable power consumption strategy to provide wind-solar complementary energy to the energy consumption module, and matching the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or the fan output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module.

[0006] Optionally, the closed-loop feedback control model is:

[0007] in, is the output power of the energy input module, is the output value of PID control, is the error signal, t is the current time, is the integration variable, 、 and are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0008] Optionally, the system control module is configured to obtain solar irradiance and determine the photovoltaic output power of the energy input module based on the solar irradiance; When the output power provided by the energy input module is photovoltaic output power, the error signal is substituted into the closed-loop feedback control model, and the resulting closed-loop feedback equation is:

[0009] in, is the expected heating power of the resistive heating terminal, is the solar irradiance, is the area of the photovoltaic module, is the comprehensive conversion efficiency of photovoltaic power generation, is the power generation efficiency of the photovoltaic module, 、 、 and At historical moments The expected heating power, solar irradiance, comprehensive conversion efficiency of photovoltaic power generation and power generation efficiency of photovoltaic modules.

[0010] Optionally, the system control module is configured to obtain wind speed and determine the wind turbine output power of the energy input module based on the wind speed; When the output power provided by the energy input module is the wind turbine output power, the error signal is substituted into the closed-loop feedback control model, and the resulting closed-loop feedback equation is:

[0011] in, is the air density, is the effective area of the wind wheel, is the wind speed, is the wind energy utilization coefficient, is the wind speed dependent power generation efficiency.

[0012] Optionally, the system control module is further configured to: In the case of the heating season, the energy priority selection signal is read and the type of renewable energy to provide heating energy is selected and judged; determining the variable power consumption strategy based on the renewable energy type of the first priority, and allocating the amount of electricity used for heating based on the variable power consumption strategy; If the amount of electricity provided by renewable energy sources of the first priority is less than the amount of electricity used for heating, the amount of electricity provided by renewable energy sources of the second priority is switched to.

[0013] Optionally, the system control module is further configured to: If the amount of electricity provided by the first-priority renewable energy type and the amount of electricity provided by the second-priority renewable energy type are both less than the amount of electricity used for heating, the electricity is supplemented based on the external power grid.

[0014] Optionally, the system control module is further configured to: When the energy input module provides surplus power, it is determined whether the user has a demand for daily electricity. If so, power is provided to the daily electricity load; if not, the energy storage module is charged.

[0015] Optionally, the system control module is further configured to: In the non-heating season, it is determined whether the user has a demand for household electricity. If so, electricity is provided to the household electricity load; if not, the electric energy storage module is charged.

[0016] Optionally, the system control module is further configured to: When the solar irradiance is lower than the irradiance threshold, or the wind speed is lower than the wind speed threshold, the electric energy output by the energy input module is preferentially stored in the electric energy storage module; When the solar irradiance is higher than the irradiance threshold, or the wind speed is higher than the wind speed threshold, the electric energy output by the energy input module is preferentially output to the resistive heating terminal or the domestic electricity load.

[0017] In a second aspect, an embodiment of the present application provides a variable power wind-solar complementary energy supply method for distinguishing the intensity of renewable energy, which is applied to a system control module of a variable power wind-solar complementary energy supply system for distinguishing the intensity of renewable energy; the method includes: Formulate a variable power consumption strategy that differentiates the intensity of renewable energy, and dynamically allocate the renewable energy power input to the energy consumption module based on the variable power consumption strategy to provide wind and solar complementary energy to the energy consumption module, and match the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or the fan output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module.

[0018] Compared with the existing technology, the beneficial effect of the present application is: through the intelligent control method combining closed-loop feedback control with black box model, the efficient coordinated operation of the wind-solar complementary energy supply system and the resistive heating terminal is realized. By sensing the changes in the output power of photovoltaic and wind turbines in real time, and dynamically adjusting the PID control parameters based on the error signal, the heating power can accurately track the power generation fluctuations of renewable energy, thereby maximizing the proportion of clean energy consumption while ensuring the heating effect. This adaptive control mechanism effectively overcomes the power matching problem caused by the intermittent and volatile nature of wind and solar resources, avoiding the problems of energy waste or insufficient power supply in the traditional fixed power mode, and significantly reducing the frequent charging and discharging requirements of the battery, thereby extending the service life of the energy storage equipment. Through the closed-loop operation mode that relies entirely on renewable energy, the system realizes decoupled operation from the power grid, which can reduce the additional cost brought by the mains supplement and improve the economy and environmental protection of the energy supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a constant power heating load that is inconsistent with the generated power of the photovoltaic system.

[0020] Figure 2 This is a schematic diagram of the measured heating temperature of a certain electric heating film under different voltages.

[0021] Figure 3 A schematic structural diagram of a variable power wind-solar complementary energy supply system that differentiates the intensity of renewable energy provided in an embodiment of the present application.

[0022] Figure 4 A further structural diagram of the variable power wind-solar complementary energy supply system for distinguishing the intensity of renewable energy provided in an embodiment of the present application.

[0023] Figure 5 Schematic diagram of the control flow of the system control module in the embodiment of the present application.

[0024] Figure 6 A schematic diagram of the control logic for energy priority selection provided in an embodiment of the present application.

[0025] Figure 7 Schematic diagram of the energy supply concept for solar energy absorption in the wind-solar complementary energy supply system provided in the embodiment of the present application.

[0026] Figure 8 Schematic diagram of the energy supply concept for wind energy absorption in the wind-solar complementary energy supply system provided in the embodiment of the present application.

[0027] Figure 9 Schematic diagram of the control strategy for the heating season provided in an embodiment of the present application.

[0028] Figure 10 Schematic diagram of the control strategy for the non-heating season provided in an embodiment of the present application.

[0029] Figure numerals: photovoltaic array unit 1; wind power generation unit 2; external power grid 3; renewable energy control router 4; data acquisition module 4-1; data analysis module 4-2; control distribution module 4-3; MPPT and inverter 4-4; data storage module 4-5; remote collaboration module 4-6; battery 5; household electricity load 6; resistive heating terminal 7. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the present application to the following embodiments. All technologies implemented based on the content of the present application fall within the scope of protection of the present application.

[0031] Unless otherwise specified, in the description of the specific embodiments of this application, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", and "side" are based on the expression of the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product / device / apparatus is placed when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of this application or simplifying the description in the specific embodiments to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore should not be understood as limiting this application.

[0032] In the description of the embodiments of this application, the technical terms "first," "second," etc., merely distinguish one entity or operation from another and are not to be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise specifically defined.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] During the research process, the applicant found that traditional constant power heating equipment (such as heat pumps, air conditioning units, etc.) requires additional input of mains electricity, which causes energy costs and affects the promotion of the system. Figure 1 , Figure 1 This diagram illustrates a situation where a constant-wattage heating load is inconsistent with the PV system's generated power. Taking solar energy as an example, a constant-wattage heating load is inconsistent with the PV system's generated power. Batteries or utility power are needed to maintain a constant operating power, inevitably leading to utility power consumption and resulting energy costs.

[0035] Resistive heating terminals using heating cables, electric heating films, etc. can operate at different powers in off-grid photovoltaic systems or wind-solar hybrid systems. However, due to the lack of mains electricity, when solar or wind energy is sufficient, the system's power generation capacity is strong, the operating voltage of the resistive terminal is high, and the heating temperature is also high. When solar or wind energy becomes weak and the power generation capacity decreases, the operating voltage of the resistive terminal is low and the heating temperature is also low. In other words, the thermal energy quality of the resistive heating terminal in the off-grid state changes with the intensity of renewable energy, affecting the heating effect of the heating terminal on the room. Please refer to Figure 2 , Figure 2 This diagram shows the measured heating temperatures of a certain electric heating film at different voltages. When the heat generation temperature approaches room temperature, it has little heating effect on the room. Batteries, a common energy storage device in renewable energy utilization systems, are suitable for low-power operation and have a low charging voltage, generally below 50V. They can effectively utilize low-intensity renewable energy, converting it into high-quality electricity for powering daily life.

[0036] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a wind-solar hybrid energy supply system with variable power that distinguishes the intensity of renewable energy provided by an embodiment of the present application. Figure 4 A further structural diagram of a variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity provided in an embodiment of the present application. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity may include: The energy input module is used to provide energy input; specifically, it includes a photovoltaic array unit 1, a wind power generation unit 2 and an external power grid 3, wherein the external power grid 3 can be a municipal power grid, which is only used as a backup energy source.

[0037] The electric energy storage module is used to store the electric energy provided by the energy input module; specifically, it includes a battery 5.

[0038] The energy consumption module is used to consume the electrical energy provided by the energy input module. Specifically, it includes household electrical loads 6 and a resistive heating terminal 7. The resistive heating terminal 7 operates using direct current (DC) generated by the renewable energy system, converting the renewable electricity generated by the photovoltaic array unit 1 and the wind power generation unit 2 into thermal energy, thereby improving the system's electrical-to-heat conversion efficiency. Household electrical loads 6, including lighting and water heaters, operate using alternating current (AC).

[0039] The system control module is used to formulate a variable power absorption strategy that distinguishes the intensity of renewable energy, and dynamically allocates the renewable energy power input into the energy consumption module based on the variable power absorption strategy to provide wind and solar complementary energy to the energy consumption module, and to match the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; specifically, it includes a renewable energy control router 4, and the renewable energy control router 4 includes a data acquisition module 4-1, a data analysis module 4-2, a control distribution module 4-3, an MPPT and inverter 4-4, a data storage module 4-5, and a remote collaboration module 4-6.

[0040] The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or wind turbine output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module in the above implementation process.

[0041] The system control part is mainly undertaken by the renewable energy control router 4, and the operation mainly includes six steps: energy priority selection, data collection, data analysis, control distribution, data storage and remote collaborative control. Figure 4 , Figure 4 Schematic diagram of the control flow of the system control module in the embodiment of the present application.

[0042] Step S10, energy priority selection: please refer to Figure 6 , Figure 6 This is a control logic diagram for energy priority selection provided in the embodiment of this application. The user selects the energy supply priority of solar energy and wind energy according to local resources and weather conditions. If solar energy is selected as the first priority energy supply, Wind energy is the second priority energy source by default. , the system is powered by solar energy first, and the solar irradiance As the first priority energy supply Control parameters , with wind speed v As the second priority energy source Control parameters If wind energy is selected The default solar energy is , the system is powered by wind energy first, and the wind speed v As the first priority energy supply Control parameters , with solar irradiance As the second priority energy source Control parameters .

[0043] Step S20, data collection: mainly carried out in the data collection module 4-1, the solar irradiance , wind speed v , battery state of charge SOC, time t , indoor temperature The data are collected and transmitted to the data analysis module 4-2.

[0044] Step S30, data analysis: mainly carried out in the data analysis module 4-2, analyzing the solar energy and wind energy output at that moment and the amount of electricity that the battery can provide; whether heating or household electricity is needed.

[0045] Step S30 specifically includes: Step S301: Obtaining the parameters of the photovoltaic array unit 1 and the solar irradiance , calculate the photovoltaic power generation at this time, photovoltaic power generation = photovoltaic output power × time step, photovoltaic output power is ,in The area of photovoltaic modules for solar energy systems; The comprehensive conversion efficiency of the photovoltaic power generation system; is the power generation efficiency of the photovoltaic module; Step S302: Obtain the parameters and wind speed of the wind power generation unit 2 v , calculate the wind power generation at this time, wind turbine power generation = wind turbine output power × time step, wind turbine output power is ,in is the air density; is the effective area of the wind wheel; is the wind energy utilization coefficient; is the wind speed-dependent power generation efficiency; Step S303, obtaining battery 5 parameters, and calculating the amount of electricity that can be released and stored by the battery at this time based on the SOC; Step S304, according to time t and domestic electricity load to analyze whether there is energy demand for heating, domestic electricity, etc.

[0046] Step S40, control allocation: formulate a variable power control allocation strategy that differentiates the intensity of renewable energy, which is mainly performed in the control allocation module 4-3.

[0047] Among them, the control strategy is determined according to the setting of the user's energy priority, and the electric energy is distributed and transmitted according to the strategy. The energy supply idea of the wind-solar complementary energy supply system in the embodiment of the present application is "storage and consumption during weak wind and weak radiation periods, and consumption and consumption during strong wind and strong radiation periods". Please refer to Figure 7 and Figure 8 , Figure 7 Schematic diagram of the energy supply concept for solar energy absorption in the wind-solar complementary energy supply system provided in the embodiment of the present application. Figure 8 Schematic diagram of the energy supply concept for wind energy absorption in the wind-solar complementary energy supply system provided in the embodiment of the present application.

[0048] Taking solar energy resources as an example, suppose a certain solar irradiance Value or wind speed v The values are respectively set and , if at a certain moment or , it is considered that this is the period of strong renewable energy generation capacity, the system operating voltage is relatively high, and the electricity produced by renewable energy is preferentially transmitted to the resistive heating terminal 7 or the domestic electricity load 6 for consumption; if at a certain moment or , it is considered that this is the period when renewable energy has strong power generation capacity and weak output, and the electricity produced by renewable energy is preferentially transmitted to the battery for storage.

[0049] Step S40 mainly includes: Step S401: Read the user's energy priority selection.

[0050] Step S402: PID control strategy for varying power to absorb renewable energy.

[0051] In the embodiment of the present application, PID control is used to control the output power of the resistive heating terminal 7. Perform precise regulation, that is, characterize the relationship between the output power of the energy input module and the output value of the PID control in the system control module based on a closed-loop feedback control model. The closed-loop feedback control model is:

[0052] in, is the output power of the energy input module, is the output value of PID control, is the error signal, t is the current time, is the integration variable, 、 and are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0053] In the case of solar power supply, the output power provided by the energy input module is the photovoltaic output power, and the expected output power of the resistive heating terminal 7 is , whose value changes hourly and is consistent with the hourly solar irradiance Closely related. and photovoltaic output power The difference is the error signal .

[0054] The system control module is configured to obtain solar irradiance and determine the photovoltaic output power of the energy input module based on the solar irradiance. By substituting the error signal e(t) into the closed-loop feedback control model, the closed-loop feedback equation is obtained:

[0055] in, is the output power of the energy input module, is the output value of PID control, is the error signal, t is the current time, is the integration variable, 、 and are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0056] Adjustment through black box model 、 and The coefficient can be Make adjustments so that ≈ , achieving the fluctuation tracking and matching of the heating terminal power and solar power generation capacity, thus eliminating the need for mains electricity supplement.

[0057] In the case of wind power supply, the output power provided by the energy input module is the wind turbine output power. The effective matching process between the wind turbine output power and the output power of the variable power heating terminal is roughly the same as that of the photovoltaic cell. The expected output power of the resistive heating terminal 7 is , whose value changes hourly and is consistent with the hourly wind speed Closely related.

[0058] The system control module is configured to obtain wind speed and determine the wind turbine output power of the energy input module based on the wind speed.

[0059] By bringing the error signal e(t) into the closed-loop feedback control model, the closed-loop feedback equation is obtained:

[0060] in, is the expected heating power of the resistive heating terminal, is the solar irradiance, is the area of the photovoltaic module, is the comprehensive conversion efficiency of photovoltaic power generation, is the power generation efficiency of the photovoltaic module, 、 、 and At historical moments The expected heating power, solar irradiance, comprehensive conversion efficiency of photovoltaic power generation and power generation efficiency of photovoltaic modules.

[0061] Adjustment through black box model 、 and The coefficient can be Make adjustments so that ≈ , achieving the fluctuation tracking and matching of the heating terminal power and wind power generation capacity, thus eliminating the need for mains electricity supplement.

[0062] Step S403: Based on the PID variable power consumption strategy input, the electric energy is distributed and transmitted according to the corresponding control strategy.

[0063] Please see Figure 9 , Figure 9 Schematic diagram of the control strategy for the heating season provided in an embodiment of the present application.

[0064] The system control module can be configured to: in the case of the heating season, read the energy priority selection signal and make a selection judgment on the type of renewable energy to provide heating energy; determining the variable power consumption strategy based on the renewable energy type of the first priority, and allocating the amount of electricity used for heating based on the variable power consumption strategy; If the amount of electricity provided by renewable energy sources of the first priority is less than the amount of electricity used for heating, the amount of electricity provided by renewable energy sources of the second priority is switched to.

[0065] The wind-solar hybrid energy supply system gives priority to heating. First, it reads the user's energy priority selection, selects and determines the type of renewable energy that provides heating energy, and allocates the power required for heating according to the PID variable power absorption strategy in step S402. For example, the wind energy is ,like (Right now )> its setting value (such as 300W / m 2 ), then Power generation provides electrical energy for the resistive heating terminal 7; otherwise, (Right now )> its setting value (such as 5m / s), then Power generation provides electrical energy for the resistive heating terminal 7; if < (such as 5m / s) to determine the indoor temperature at this time Whether the room temperature reaches the set value ,like > (such as 18℃), for economic reasons, no mains electricity will be consumed for heating. If the temperature cannot be reached, the backup mains power will be started to meet the heating demand.

[0066] Furthermore, the system control module is further configured to: When the energy input module provides surplus power, it is determined whether the user has a demand for daily electricity. If so, power is provided to the daily electricity load; if not, the energy storage module is charged.

[0067] For example, if a user has household electricity needs, the user's household electricity needs must also be met. The premise is that if solar energy or wind energy has been used to meet heating needs, it can no longer be used to meet household electricity needs.

[0068] Optionally, the system control module is further configured to: If the amount of electricity provided by the first-priority renewable energy type and the amount of electricity provided by the second-priority renewable energy type are both less than the amount of electricity used for heating, the electricity is supplemented based on the external power grid.

[0069] The user chooses solar energy For example, the wind energy is ,like (Right now )< (such as 300W / m 2 ), then it is in the weak irradiation period, Generate electricity to charge the battery 5; if (Right now )> (such as 300W / m 2 ), still need to judge Whether to provide power to the resistance heating terminal 7. If the resistance heating terminal 7 is provided with power, it cannot provide power to the life electricity load 6. If the resistance heating terminal 7 is not provided with power, it will be The power generation is optimized to provide power for the household electrical load 6, and the battery 5 and the municipal power grid 3 are used as supplements. Power supply, if (Right now )< (such as 5m / s), then it is in the weak wind period. Priority is given to charging battery 5; if (Right now )> (such as 5m / s), it is necessary to judge Whether to provide power to the resistance heating terminal 7. If the resistance heating terminal 7 is provided with power, it cannot provide power to the life electricity load 6. If the resistance heating terminal 7 is not provided with power, it will be The power generation provides electrical energy for household electrical loads 6, with batteries 5 and the municipal power grid 3 serving as supplements.

[0070] If the user has no demand for domestic electricity, it is judged whether the SOC is lower than its set value SOCset. If SOC < SOCset (such as 20%), the renewable energy preferentially charges the battery 5, otherwise the system does not supply power to the domestic electricity load 6 and the battery 5 within this time step.

[0071] Please refer to Figure 10 , Figure 10 which is the schematic diagram of the control strategy in the non-heating season provided by the embodiment of the present application.

[0072] The system control module can also be configured as: in the case of the non-heating season, it is judged whether the user has a demand for domestic electricity. If so, power is supplied to the domestic electricity load; if not, the electric energy storage module is charged.

[0073] In the case where the solar irradiance is lower than the irradiance threshold or the wind speed is lower than the wind speed threshold, the electric energy output by the energy input module is preferentially stored in the electric energy storage module; In the case where the solar irradiance is higher than the irradiance threshold or the wind speed is higher than the wind speed threshold, the electric energy output by the energy input module is preferentially output to the resistive heating terminal or the domestic electricity load.

[0074] For example, if the user has a demand for domestic electricity, the user's electricity demand needs to be met. First, read the selection of the user's energy priority. Taking the user's selection of solar energy as an example, at this time the wind energy is , if (that is ) < its set value (such as 300 W / m 2 ), then it is at a weak irradiation period at this time, and the battery 5 is preferentially charged; if (that is ) > (such as 300 W / m 2 ), then the power generation by preferentially supplies power to the domestic electricity load 6. Then judge the power supply situation of . If (that is [[ID=D47]] ) < (such as 5 m / s), then it is at a weak wind period at this time, and the battery 5 is preferentially charged; if (that is ) > (such as 5 m / s), then the power generation by preferentially supplies power to the domestic electricity load 6. If the user has no demand for domestic electricity, judge whether the SOC is lower than its set value , if SOC < (e.g. 20%), renewable energy is used to charge the battery 5 first, otherwise the system does not provide power to the household electrical load 6 and the battery 5 within this time step.

[0075] In the above implementation process, the efficient coordinated operation of the wind-solar complementary energy supply system and the resistive heating terminal is achieved through an intelligent control method that combines closed-loop feedback control with a black box model. By real-time sensing of changes in photovoltaic and wind turbine output power and dynamically adjusting PID control parameters based on error signals, the heating power can accurately track the fluctuations in renewable energy generation, thereby maximizing the proportion of clean energy consumption while ensuring the heating effect. This adaptive control mechanism effectively overcomes the power matching difficulties caused by the intermittent and volatile nature of wind and solar resources, avoiding the problems of energy waste or insufficient power supply in the traditional fixed power mode, and significantly reducing the frequent charging and discharging requirements of the battery, thereby extending the service life of the energy storage equipment. Through a closed-loop operation mode that relies entirely on renewable energy, the system achieves decoupled operation from the power grid, which can reduce the additional costs brought by mains power supplementation and improve the economy and environmental protection of the energy supply system.

[0076] Based on the same application concept, the embodiment of the present application further provides a variable power wind-solar complementary energy supply method for distinguishing the intensity of renewable energy, which can be applied to the system control module of the variable power wind-solar complementary energy supply system for distinguishing the intensity of renewable energy in the above description; The method includes: Formulate a variable power consumption strategy that differentiates the intensity of renewable energy, and dynamically allocate the renewable energy power input to the energy consumption module based on the variable power consumption strategy to provide wind and solar complementary energy to the energy consumption module, and match the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or the fan output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module.

[0077] It should be understood that when the various modules of the system provided in the above embodiments are working, they are only illustrated by the division of the various functional modules in the above description. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0078] The functional modules in the above embodiments may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The above integrated units may be implemented in the form of hardware or software functional units. In addition, the specific names of the functional units and modules are only for the purpose of distinguishing them from each other and are not intended to limit the scope of protection of the embodiments of this application.

[0079] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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. 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 various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A variable power wind-solar hybrid energy supply system that distinguishes the intensity of renewable energy, characterized by: include: An energy input module, used for providing energy input; an electric energy storage module, used to store the electric energy provided by the energy input module; an energy consumption module, configured to consume the electrical energy provided by the energy input module; a system control module for formulating a variable power consumption strategy that differentiates the intensity of renewable energy, and dynamically allocating the renewable energy power input to the energy consumption module based on the variable power consumption strategy to provide wind-solar complementary energy to the energy consumption module, and matching the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or the fan output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module.

2. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 1 is characterized in that: The closed-loop feedback control model is: in, is the output power of the energy input module, is the output value of PID control, is the error signal, t is the current time, is the integration variable, 、 and are the proportional coefficient, integral coefficient and differential coefficient respectively.

3. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 2 is characterized in that: The system control module is configured to obtain solar irradiance and determine the photovoltaic output power of the energy input module based on the solar irradiance; When the output power provided by the energy input module is photovoltaic output power, the error signal is substituted into the closed-loop feedback control model, and the resulting closed-loop feedback equation is: in, is the expected heating power of the resistive heating terminal, is the solar irradiance, is the area of the photovoltaic module, is the comprehensive conversion efficiency of photovoltaic power generation, is the power generation efficiency of the photovoltaic module, 、 、 and At historical moments The expected heating power, solar irradiance, comprehensive conversion efficiency of photovoltaic power generation and power generation efficiency of photovoltaic modules.

4. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 2 is characterized in that: The system control module is configured to obtain wind speed and determine the wind turbine output power of the energy input module based on the wind speed; When the output power provided by the energy input module is the wind turbine output power, the error signal is substituted into the closed-loop feedback control model, and the resulting closed-loop feedback equation is: in, is the air density, is the effective area of the wind wheel, is the wind speed, is the wind energy utilization coefficient, is the wind speed dependent power generation efficiency.

5. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 3 or 4, characterized in that: The system control module is further configured to: In the case of the heating season, the energy priority selection signal is read and the type of renewable energy to provide heating energy is selected and judged; determining the variable power consumption strategy based on the renewable energy type of the first priority, and allocating the amount of electricity used for heating based on the variable power consumption strategy; If the amount of electricity provided by renewable energy sources of the first priority is less than the amount of electricity used for heating, the amount of electricity provided by renewable energy sources of the second priority is switched to.

6. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 5 is characterized in that: The system control module is further configured to: If the amount of electricity provided by the first-priority renewable energy type and the amount of electricity provided by the second-priority renewable energy type are both less than the amount of electricity used for heating, the electricity is supplemented based on the external power grid.

7. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 5 is characterized in that: The system control module is further configured to: When the energy input module provides surplus power, it is determined whether the user has a demand for daily electricity. If so, power is provided to the daily electricity load; if not, the energy storage module is charged.

8. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 3 or 4, characterized in that: The system control module is further configured to: In the non-heating season, it is determined whether the user has a demand for household electricity. If so, electricity is provided to the household electricity load; if not, the electric energy storage module is charged.

9. The variable power wind-solar hybrid energy supply system for differentiating renewable energy intensity according to claim 1 is characterized in that: The system control module is further configured to: When the solar irradiance is lower than the irradiance threshold, or the wind speed is lower than the wind speed threshold, the electric energy output by the energy input module is preferentially stored in the electric energy storage module; When the solar irradiance is higher than the irradiance threshold, or the wind speed is higher than the wind speed threshold, the electric energy output by the energy input module is preferentially output to the resistive heating terminal or the domestic electricity load.

10. A variable power wind-solar complementary energy supply method that distinguishes the intensity of renewable energy, characterized in that: System control module for variable power wind-solar hybrid energy supply systems that differentiate the intensity of renewable energy; The variable power wind-solar complementary energy supply system for distinguishing the intensity of renewable energy further includes: An energy input module, used for providing energy input; an electric energy storage module, used to store the electric energy provided by the energy input module; an energy consumption module, configured to consume the electrical energy provided by the energy input module; The method comprises: Formulate a variable power consumption strategy that differentiates the intensity of renewable energy, and dynamically allocate the renewable energy power input to the energy consumption module based on the variable power consumption strategy to provide wind and solar complementary energy to the energy consumption module, and match the renewable energy generation power with the power of the resistive heating terminal in the energy consumption module in real time; The variable power consumption strategy includes: An error signal is determined based on the expected heating power of the resistive heating terminal and the photovoltaic output power or the fan output power of the energy input module, and the error signal is substituted into a closed-loop feedback control model. The coefficients in the closed-loop feedback control model are adjusted through a black box model to adjust the output power of the energy input module. The closed-loop feedback control model characterizes the relationship between the output power of the energy input module and the output value of the PID control in the system control module.

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