An energy storage heating system based on new energy energy conversion

Abstract

This invention provides an energy storage heating system based on new energy energy conversion. The power distribution and grid connection unit is adapted to the weak power grid in Northwest China, completing high-altitude parameter correction. The electric heating steam generation unit adopts multi-element parameter control and a coarse-fine two-stage strategy to stabilize steam output. The first thermal storage unit stores high-temperature heat energy during periods of high new energy generation and low electricity prices, with higher priority for heat release. The second thermal storage unit recovers various types of waste heat and stores low-temperature heat. The steam-to-hot water conversion unit recovers waste heat from condensate, simultaneously monitors condensate water quality, and automatically discharges wastewater. The residential heating unit calculates the water supply temperature based on environmental and room temperature parameters, and controls pumps and valves. The intelligent control unit relies on AI algorithms to predict power generation and heat load, calculates the state of charge of thermal storage, coordinates overall scheduling, and completes two-way data and command interaction between the power grid and the cloud. This invention utilizes waste steam heat to provide residential heating, achieving energy time-shifting multi-energy complementarity, modular adaptation to multiple scenarios, and suitability for the special operating conditions of high altitude and weak power grid in Northwest China.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology for new energy thermal energy, and in particular to an energy storage heating system based on the conversion of new energy energy. Background Technology

[0003] In existing technologies, electrically heated steam boilers and residential heating systems mostly operate independently, failing to fully utilize the waste heat generated during the steam heating process. Regarding thermal storage technologies, water storage, solid-state storage, and phase change storage each have their advantages and disadvantages, but there is a lack of systematic design for multi-energy complementarity and cascade utilization tailored to the fluctuating characteristics of new energy sources in Northwest China. Furthermore, existing systems are mostly designed for single-scale users, making it difficult to flexibly adapt from single villas to office buildings by adjusting the number of heating units and the amount of thermal storage medium. The high altitude, strong winds, and sandstorms of Northwest China also place higher demands on the weather resistance of equipment and the stability of the power grid. Summary of the Invention

[0004] This invention provides an energy storage heating system based on new energy energy conversion. The system includes: a new energy power generation unit, a power distribution and grid connection unit, an electric heating steam generation unit, a first thermal storage unit, a second thermal storage unit, a steam-hot water conversion unit, a residential heating unit, and an intelligent control unit. The new energy power generation unit is used to convert wind energy and solar energy into electrical energy using wind turbine generator sets and photovoltaic power generation arrays. The power distribution and grid connection unit is used to perform voltage and frequency regulation, as well as high-altitude correction, based on the weak power grid conditions in Northwest China. The electric heating steam generating unit is used to control steam output based on multi-element control of electric heating parameters and a two-level control strategy. The first thermal storage unit stores thermal energy during peak periods of new energy power generation or off-peak periods of the power grid by controlling the thermal storage process and the thermal release process separately. The second thermal storage unit also controls the thermal storage process and the thermal release process separately; The steam-hot water conversion unit is used to employ dual-loop coordinated control technology to dynamically adjust the steam and circulating water flow rates. At the same time, it recovers high-temperature condensate waste heat for heating preheating and combines online monitoring and automatic discharge of condensate water quality. The residential heating unit is used to calculate the target water supply temperature based on the heating area and frequency range, as well as the outdoor temperature and the indoor set temperature. It then adjusts the speed of the circulating pump and the opening of the electric valve on the plate heat exchanger side. At the same time, it uses self-operated or electric thermostatic valves to independently control the temperature of each room. The intelligent control unit is used to accurately predict the power generation and heat load curves of new energy sources through AI algorithms that integrate meteorological and historical operational data, and to calculate the state of charge of multi-medium thermal storage units in real time; at the same time, it performs global coordinated regulation and multi-source data interaction to realize two-way command interaction between power grid dispatch and cloud platform.

[0005] As a preferred embodiment of the present invention, the high-altitude correction of the power distribution and grid connection unit is specifically as follows: for high-altitude electrical equipment, the external insulation withstand voltage is corrected for altitude using the following formula: U = U0 × (1 + k × (H - 1000) / 100) Where U is the corrected withstand voltage, U0 is the reference withstand voltage below 1000m altitude, k is the correction factor (e.g., 0.01), and H is the actual altitude (m) of the installation site.

[0006] As a preferred embodiment of the present invention, the electrically heated steam generating unit includes an electrically heated control module, a two-stage control module, and a steam output adjustment module; The electric heating control module is used to control the water inlet flow rate based on the water level signal and steam output flow rate signal in the steam generating container, and to preheat the inlet water to a preset temperature range. Subsequently, it adjusts the steam output based on the steam pressure signal and user load requirements. The two-level control module is used to implement a two-level control strategy of coarse adjustment grouping and fine adjustment phase shift. The steam output adjustment module generates high-temperature, high-pressure turbulent steam and heats part of the feedwater to superheated steam above the saturation temperature. After steam-water separation, the superheated steam is injected into the water space of the steam generating container. Subsequently, the condensate discharged from the steam-water heat exchanger is used to preheat the feedwater.

[0007] As a preferred embodiment of the present invention, the coarse adjustment grouping specifically involves: grouping the electric heating modules according to binary weights, and switching different numbers of modules using contactors or solid-state relays based on the real-time output of the new energy power generation unit, the grid electricity price signal, and the user's heat load demand; the adjustment resolution depends on the grouping method. The fine-tuning phase shift specifically involves selecting one group from N groups of electric heating modules as the adjustment group, and achieving continuous adjustment through thyristor phase shift triggering, so that the total heating power is continuously adjustable.

[0008] In a preferred embodiment of the present invention, the heat storage process of the first heat storage unit is specifically as follows: (1) During peak periods of new energy power generation or off-peak periods of grid electricity price, power is allocated to the first thermal storage unit according to the principle of high temperature priority, and the electrical energy is converted into thermal energy for storage by heating the electric heating wire. (2) Monitor the temperature at multiple points inside each section of the heat storage box, and adjust the power distribution of each section of electric heating wires through the SOC equalization algorithm; (3) When the average temperature of all thermal storage boxes reaches the upper limit temperature, thermal storage shall be stopped; or when it is predicted that there will be sufficient new energy power generation in the future and no further thermal storage is required, thermal storage shall be terminated in advance.

[0009] As a preferred embodiment of the present invention, the heat release process control of the first heat storage unit is specifically as follows: (1) When there is insufficient new energy power generation or the grid electricity price is at its peak, heat release is given priority, and the heat release priority is higher than the direct heating of the second thermal storage unit and the electric heating steam generation unit; (2) Adjust the flow rate of the heat storage medium in the heat storage tank according to the user's steam load demand, thereby controlling the heat release rate; (3) The heat extraction air duct of the heat storage box is connected in parallel to the main heat extraction pipeline through an electric air valve, and the heat release of each section of the heat storage box is flexibly scheduled according to the load demand.

[0010] As a preferred embodiment of the present invention, the heat storage process and heat release process of the second heat storage unit are specifically as follows: (1) When the hydrophobic / residual heat temperature is higher than the melting point of the phase change material, start the heat storage circulation pump to transfer heat from the heat exchanger to the phase change heat storage module; (2) When the residents’ heating demand increases and the heat energy of the first heat storage unit is insufficient, the heat release circulation pump of the second heat storage unit is started to transfer the heat of the phase change heat storage module to the heating circulation water through the plate heat exchanger.

[0011] As a preferred embodiment of the present invention, the steam-hot water conversion unit is specifically used for: (1) The steam-hot water conversion unit adopts dual-loop coordinated control technology, which dynamically adjusts the steam and circulating water flow rates; (2) The steam-hot water conversion unit has the functions of energy cascade utilization and water quality closed-loop management. It uses high-temperature hydrophobic waste heat for heating preheating and combines online monitoring of condensate water quality and automatic sewage discharge mechanism. (3) The steam-hot water conversion unit collects user load and outlet temperature signals in real time, and the linkage regulating valve dynamically matches the steam flow rate and circulating water volume; (4) The steam-hot water conversion unit intelligently adjusts the amount of heating return water entering the plate heat exchanger through an electric three-way regulating valve according to the temperature status of the second heat storage unit and the terminal heating demand; (5) The steam-hot water conversion unit adjusts the return water pump flow rate according to the water inlet demand of the electric heating unit and monitors the conductivity and pH value of the condensate in real time.

[0012] As a preferred embodiment of the present invention, the intelligent control unit includes a new energy power generation prediction module, a load prediction module, an energy storage management module, and a communication interaction module.

[0013] As a preferred embodiment of the present invention, the intelligent control unit includes a new energy power generation prediction module, a load prediction module, an energy storage management module, and a communication interaction module; The energy storage management module is used to monitor the temperature distribution and phase change state of each thermal storage unit in real time, and to accurately calculate the state of charge and releaseable heat of the thermal storage unit through thermodynamic integration and temperature threshold algorithms.

[0014] Compared with the prior art, the present invention has the following advantages: Excess energy generated during the electric heating of steam is effectively transferred to residential heating, achieving cascaded utilization of energy. Make full use of the volatility characteristics of new energy sources such as wind power and photovoltaics in Northwest China, and combine them with energy storage systems to achieve multi-energy complementarity and energy time shifting; By adjusting the number of heating units and the amount of the first thermal storage medium, modular and flexible adaptation can be achieved, from single private villas to office buildings; It is adapted to the special environment of high altitude, strong winds and sandstorms in Northwest China and the unstable power grid conditions in remote areas.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an energy storage heating system based on the conversion of new energy sources. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in order to achieve the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0018] like Figure 1 As shown, the present invention provides an energy storage heating system based on new energy energy conversion. The system includes: a new energy power generation unit, a power distribution and grid connection unit, an electric heating steam generation unit, a first thermal storage unit, a second thermal storage unit, a steam-hot water conversion unit, a residential heating unit, and an intelligent control unit.

[0019] The new energy power generation unit is used to convert wind energy and solar energy into electrical energy using wind turbine generators and photovoltaic power generation arrays.

[0020] The power distribution and grid connection unit is used to perform voltage and frequency regulation, as well as high-altitude correction, based on the weak power grid conditions in Northwest China.

[0021] The system can operate continuously for 625ms when the grid connection voltage drops to 20% of the rated voltage and for 1 second when the voltage rises to 120% of the rated voltage. Simultaneously, when the grid frequency is below 49.8Hz, the system automatically reduces power intake from the grid and may even supply power to the grid; when the grid frequency is above 50.2Hz, the system starts heating and heat storage at full load, participating in the primary frequency regulation of the grid. Furthermore, a virtual synchronous generator control strategy is adopted to simulate the rotational inertia and damping characteristics of a synchronous generator, providing frequency and voltage support for weak grids.

[0022] The high-altitude correction specifically refers to the following formula for adjusting the external insulation withstand voltage for high-altitude electrical equipment: U = U0 × (1 + k × (H - 1000) / 100) Where U is the corrected withstand voltage, U0 is the reference withstand voltage below 1000m altitude, k is the correction factor (e.g., 0.01), and H is the actual altitude (m) of the installation site. The safe clearance of electrical equipment is corrected by increasing by 1% for every 100m increase in altitude; the creepage distance of insulators is increased by the same proportion.

[0023] The electric heating steam generating unit is used to control steam output based on multi-element control of electric heating parameters and a two-level control strategy.

[0024] The electric heating steam generating unit includes an electric heating control module, a two-stage control module, and a steam output adjustment module.

[0025] The electric heating control module is used to control the inlet water flow rate to maintain a constant water level (e.g., water level fluctuations are controlled within ±10mm) based on the water level signal and steam output flow rate signal in the steam generating container, and to preheat the inlet water to a preset temperature range (e.g., 80-90 degrees Celsius) using the residual heat from the steam-water heat exchanger. Subsequently, it adjusts the steam output according to the steam pressure signal and user load requirements to maintain the outlet steam pressure stable within the set value range (e.g., ±3%).

[0026] The two-level control module is used to implement a two-level control strategy of coarse adjustment grouping and fine adjustment phase shift. Specifically, the coarse adjustment grouping involves grouping N groups of electric heating modules according to binary weights (e.g., groups 1, 2, 4, and 5 when N=12), and switching different numbers of modules via contactors or solid-state relays based on the real-time output of the new energy power generation unit, grid electricity price signals, and user heat load demands. The adjustment resolution depends on the grouping method. The fine adjustment phase shift involves selecting one group from the N groups of electric heating modules as the adjustment group, and using thyristor phase shift triggering to achieve continuous adjustment from 0% to 100%, making the total heating power continuously adjustable.

[0027] The steam output adjustment module generates high-temperature, high-pressure turbulent steam and heats part of the feedwater to superheated steam 10-15°C above the saturation temperature. After steam-water separation, the superheated steam is injected into the water space of the steam generating container. Subsequently, the condensate (temperature approximately 80-95°C) discharged from the steam-water heat exchanger is used to preheat the feedwater, reducing the work loss due to temperature difference in electric heating.

[0028] The first thermal storage unit stores thermal energy during peak periods of new energy power generation or off-peak periods of the power grid by controlling the thermal storage process and the thermal release process separately.

[0029] The heat storage process specifically includes: (1) During peak periods of new energy power generation or off-peak periods of grid electricity price, power is allocated to the first thermal storage unit according to the principle of high temperature priority, and the electrical energy is converted into thermal energy storage by heating the electric heating wire.

[0030] (2) Monitor the temperature at multiple points inside each section of the heat storage box, and adjust the power distribution of each section of electric heating wires through the SOC equalization algorithm to ensure that the temperature gradient of the heat storage box is ≤ ±10℃.

[0031] (3) When the average temperature of all heat storage boxes reaches the upper limit temperature (e.g., 900℃), stop heat storage; or when it is predicted that there will be sufficient new energy power generation in the future and no further heat storage is needed, terminate heat storage in advance.

[0032] The heat release process control specifically includes: (1) When there is insufficient new energy power generation or the grid electricity price is at its peak, heat release is given priority, and the heat release priority is higher than the direct heating of the second thermal storage unit and the electric heating steam generation unit.

[0033] (2) Adjust the flow rate of the heat storage medium in the heat storage tank according to the user's steam load demand, thereby controlling the heat release rate.

[0034] (3) The heat extraction air duct of the heat storage box is connected in parallel to the main heat extraction pipeline through an electric air valve, and the heat release of each section of the heat storage box is flexibly scheduled according to the load demand.

[0035] The second thermal storage unit, similarly, controls the thermal storage and release processes separately to store medium- and low-temperature thermal energy within a medium- and low-temperature range (e.g., 60℃--200℃). The main sources of thermal energy for the second thermal storage unit are the waste heat from the condensate (80--95℃) discharged from the steam-water heat exchanger after passing through the plate heat exchanger, and the waste heat from the first thermal storage unit after its temperature drops below 300℃, making it unable to effectively generate steam.

[0036] The heat storage and heat release processes are specifically as follows: (1) When the hydrophobic / residual heat temperature is higher than the melting point of the phase change material, start the heat storage circulation pump to transfer heat from the heat exchanger to the phase change heat storage module.

[0037] (2) When the heating demand of residents increases and the heat energy of the first heat storage unit is insufficient, the heat release circulation pump of the second heat storage unit is started to transfer the heat of the phase change heat storage module to the heating circulation water through the plate heat exchanger. During the heat release process, the phase change material solidifies and releases heat, and the output temperature stabilizes near the phase change temperature.

[0038] The steam-to-hot water conversion unit employs dual-loop coordinated control technology to dynamically adjust the steam and circulating water flow rates. Simultaneously, it recovers high-temperature condensate waste heat for preheating and combines it with online monitoring and automatic drainage of condensate water quality.

[0039] Specifically: (1) The steam-hot water conversion unit adopts dual-loop coordinated control technology, which dynamically adjusts the steam and circulating water flow to accurately maintain the constant industrial steam outlet temperature, and intelligently allocates the heat medium water volume of the plate heat exchanger according to the heat storage status and heating demand.

[0040] (2) The steam-hot water conversion unit has the functions of energy cascade utilization and water quality closed-loop management. It uses high-temperature condensate waste heat for heating preheating and combines online monitoring of condensate water quality and automatic sewage discharge mechanism to ensure the safe and efficient operation of the system while achieving high quality and high utilization.

[0041] (3) The steam-hot water conversion unit collects user load and outlet temperature signals in real time, and the linkage regulating valve dynamically matches the steam flow and circulating water volume to ensure that the outlet steam temperature is stable within the set value (e.g., ±2℃).

[0042] (4) The steam-hot water conversion unit adjusts the amount of heating return water entering the plate heat exchanger through an electric three-way regulating valve according to the temperature status of the second heat storage unit and the end heating demand, so as to maximize the utilization of waste heat recovery.

[0043] (5) The steam-hot water conversion unit adjusts the return water pump flow rate according to the water inlet demand of the electric heating unit and monitors the conductivity and pH value of the condensate in real time. Once the water quality exceeds the standard, the sewage discharge mechanism is automatically triggered to prevent scaling and corrosion of the heating element.

[0044] The residential heating unit is used to calculate the target water supply temperature based on the heating area and frequency range (e.g., 30-50Hz), as well as the outdoor temperature and the indoor set temperature. This allows for the adjustment of the circulating pump speed and the opening of the electric valve on the plate heat exchanger side. Simultaneously, it employs self-regulating or electric thermostatic valves to independently control the temperature of each room. Users can set the room temperature (adjustable from 16-26℃) according to their needs, achieving on-demand heating and energy saving.

[0045] The intelligent control unit is used to accurately predict the power generation and heat load curves of new energy sources through AI algorithms that integrate meteorological and historical operational data, and to calculate the state of charge of multi-medium thermal storage units in real time; at the same time, it performs global coordinated regulation and multi-source data interaction to realize two-way command interaction between power grid dispatch and cloud platform.

[0046] The intelligent control unit includes a new energy power generation prediction module, a load prediction module, an energy storage management module, and a communication interaction module.

[0047] The new energy power generation prediction module is used to achieve accurate prediction of wind speed and light intensity at multiple time scales (ultra-short-term, short-term and medium-term) by integrating meteorological satellite cloud images, numerical weather forecasts and real-time sensor data, and to provide the system with a high-precision future power generation curve.

[0048] The load forecasting module, based on multi-dimensional information such as users' historical heating data, outdoor temperature forecasts, and production plans, uses support vector regression or random forest algorithms combined with similar day correction to accurately predict the steam and heating load demand for future periods, ensuring a dynamic balance between supply and demand.

[0049] The energy storage management module is used to monitor the temperature distribution and phase change state of each thermal storage unit in real time. It accurately calculates the state of charge (SOC) and releaseable heat through thermodynamic integration and temperature threshold algorithms, providing reliable data support for the system's energy scheduling and operation strategy.

[0050] The communication interaction module supports multiple industrial communication protocols and is responsible for bidirectional data interaction with external power grid dispatch centers, meteorological platforms, and cloud monitoring systems. It receives time-of-use electricity prices and wind and solar curtailment signals in real time, and uploads system operating status and receives remote control commands.

[0051] The technical effects are described below based on experimental results from different application scenarios.

[0052] For single-family private villas, the system configuration is as follows: N=2-4 sets of electrically heated steam generator modules (each set with a power of 10-30kW), M=2-4 sections of thermal storage tanks (each section with a thermal storage capacity of 50-125kWh), the first thermal storage unit has a thermal storage capacity of 100-500kWh and an upper limit of thermal storage temperature of 750-850℃; the second thermal storage unit has a thermal storage capacity of 50-200kWh and a phase change temperature of 60-80℃; the new energy power generation unit is configured as 10-30kW photovoltaic power + 5-15kW wind power. This configuration can meet the needs of buildings with a floor area of ​​200-600m². 2 The villa's winter heating and domestic hot water needs.

[0053] For office building applications, the system configuration is as follows: N=6-12 sets of electrically heated steam generator modules (each set with a power of 30-75kW), M=6-12 sections of thermal storage tanks (each section with a thermal storage capacity of 80-170kWh), with the first thermal storage unit having a thermal storage capacity of 500-2000kWh; the second thermal storage unit having a thermal storage capacity of 200-800kWh; and a new energy power generation unit configuration of 50-200kW photovoltaic power + 30-100kW wind power. This configuration can meet the needs of buildings with an area of ​​2000-10000m². 2 Heating needs of office buildings and steam needs of canteens / logistics facilities.

[0054] For applications in small and medium-sized enterprises, the system configuration is as follows: N=8-20 sets of electric heating steam generation modules (each set with a power of 50-100kW), M=8-20 sections of thermal storage tanks (each section with a thermal storage capacity of 125-250kWh), with the first thermal storage unit having a thermal storage capacity of 1000-5000kWh; the second thermal storage unit having a thermal storage capacity of 500-2000kWh; and the new energy power generation unit configured as 100-500kW photovoltaic power + 50-300kW wind power. This configuration can meet steam demand of 200-1000kg / h and heating area of ​​1000-10000m². 2 The comprehensive energy needs of small and medium-sized enterprises.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy storage heating system based on new energy energy conversion, the system comprising: The system includes a new energy power generation unit, a power distribution and grid connection unit, an electric heating steam generation unit, a first thermal storage unit, a second thermal storage unit, a steam-to-hot water conversion unit, a residential heating unit, and an intelligent control unit. The new energy power generation unit is used to convert wind energy and solar energy into electrical energy using wind turbine generator sets and photovoltaic power generation arrays. The power distribution and grid connection unit is used to perform voltage and frequency regulation, as well as high-altitude correction, based on the weak power grid conditions in Northwest China. The electric heating steam generating unit is used to control steam output based on multi-element control of electric heating parameters and a two-level control strategy. The first thermal storage unit stores thermal energy during peak periods of new energy power generation or off-peak periods of the power grid by controlling the thermal storage process and the thermal release process separately. The second thermal storage unit also controls the thermal storage process and the thermal release process separately; The steam-hot water conversion unit is used to employ dual-loop coordinated control technology to dynamically adjust the steam and circulating water flow rates. At the same time, it recovers high-temperature condensate waste heat for heating preheating and combines online monitoring and automatic discharge of condensate water quality. The residential heating unit is used to calculate the target water supply temperature based on the heating area and frequency range, as well as the outdoor temperature and the indoor set temperature. It then adjusts the speed of the circulating pump and the opening of the electric valve on the plate heat exchanger side. At the same time, it uses self-operated or electric thermostatic valves to independently control the temperature of each room. The intelligent control unit is used to accurately predict the power generation and heat load curves of new energy sources through AI algorithms that integrate meteorological and historical operational data, and to calculate the state of charge of multi-medium thermal storage units in real time; at the same time, it performs global coordinated regulation and multi-source data interaction to realize two-way command interaction between power grid dispatch and cloud platform.

2. The heating system according to claim 1, characterized in that: The altitude correction for the power distribution and grid connection unit is as follows: For high-altitude electrical equipment, the external insulation withstand voltage is corrected for altitude using the following formula: U = U0 × (1 + k × (H - 1000) / 100) Where U is the corrected withstand voltage, U0 is the reference withstand voltage below 1000m altitude, k is the correction factor (e.g., 0.01), and H is the actual altitude (m) of the installation site.

3. The heating system according to claim 1, characterized in that: The electric heating steam generating unit includes an electric heating control module, a two-stage control module, and a steam output adjustment module; The electric heating control module is used to control the water inlet flow rate based on the water level signal and steam output flow rate signal in the steam generating container, and to preheat the inlet water to a preset temperature range. Subsequently, it adjusts the steam output based on the steam pressure signal and user load requirements. The two-level control module is used to implement a two-level control strategy of coarse adjustment grouping and fine adjustment phase shift. The steam output adjustment module generates high-temperature, high-pressure turbulent steam and heats part of the feedwater to superheated steam above the saturation temperature. After steam-water separation, the superheated steam is injected into the water space of the steam generating container. Subsequently, the condensate discharged from the steam-water heat exchanger is used to preheat the feedwater.

4. The heating system according to claim 3, characterized in that: The coarse adjustment grouping specifically involves grouping the electric heating modules according to binary weights, and switching different numbers of modules using contactors or solid-state relays based on the real-time output of the new energy power generation unit, the grid electricity price signal, and the user's heat load demand. The adjustment resolution depends on the grouping method. The fine-tuning phase shift specifically involves selecting one group from N groups of electric heating modules as the adjustment group, and achieving continuous adjustment through thyristor phase shift triggering, so that the total heating power is continuously adjustable.

5. The heating system according to claim 1, characterized in that: wherein, The heat storage process of the first heat storage unit is as follows: (1) During peak periods of new energy power generation or off-peak periods of grid electricity price, power is allocated to the first thermal storage unit according to the principle of high temperature priority, and the electrical energy is converted into thermal energy for storage by heating the electric heating wire. (2) Monitor the temperature at multiple points inside each section of the heat storage box, and adjust the power distribution of each section of electric heating wires through the SOC equalization algorithm; (3) When the average temperature of all thermal storage boxes reaches the upper limit temperature, thermal storage shall be stopped; or when it is predicted that there will be sufficient new energy power generation in the future and no further thermal storage is required, thermal storage shall be terminated in advance.

6. The heating system according to claim 1, characterized in that: The heat release process control of the first thermal storage unit is specifically as follows: (1) When there is insufficient new energy power generation or the grid electricity price is at its peak, heat release is given priority, and the heat release priority is higher than the direct heating of the second thermal storage unit and the electric heating steam generation unit; (2) Adjust the flow rate of the heat storage medium in the heat storage tank according to the user's steam load demand, thereby controlling the heat release rate; (3) The heat extraction air duct of the heat storage box is connected in parallel to the main heat extraction pipeline through an electric air valve, and the heat release of each section of the heat storage box is flexibly scheduled according to the load demand.

7. The heating system according to claim 1, characterized in that: The heat storage and heat release processes of the second heat storage unit are as follows: (1) When the hydrophobic / residual heat temperature is higher than the melting point of the phase change material, start the heat storage circulation pump to transfer heat from the heat exchanger to the phase change heat storage module; (2) When the residents’ heating demand increases and the heat energy of the first heat storage unit is insufficient, the heat release circulation pump of the second heat storage unit is started to transfer the heat of the phase change heat storage module to the heating circulation water through the plate heat exchanger.

8. The heating system according to claim 1, characterized in that: The steam-to-hot water conversion unit is specifically used for: (1) The steam-hot water conversion unit adopts dual-loop coordinated control technology, which dynamically adjusts the steam and circulating water flow rates; (2) The steam-hot water conversion unit has the functions of energy cascade utilization and water quality closed-loop management. It uses high-temperature hydrophobic waste heat for heating preheating and combines online monitoring of condensate water quality and automatic sewage discharge mechanism. (3) The steam-hot water conversion unit collects user load and outlet temperature signals in real time, and the linkage regulating valve dynamically matches the steam flow rate and circulating water volume; (4) The steam-hot water conversion unit intelligently adjusts the amount of heating return water entering the plate heat exchanger through an electric three-way regulating valve according to the temperature status of the second heat storage unit and the terminal heating demand; (5) The steam-hot water conversion unit adjusts the return water pump flow rate according to the water inlet demand of the electric heating unit and monitors the conductivity and pH value of the condensate in real time.

9. The heating system according to claim 1, characterized in that: The intelligent control unit includes a new energy power generation prediction module, a load prediction module, an energy storage management module, and a communication interaction module.

10. The heating system according to claim 9, characterized in that: The intelligent control unit includes a new energy power generation prediction module, a load prediction module, an energy storage management module, and a communication interaction module; The energy storage management module is used to monitor the temperature distribution and phase change state of each thermal storage unit in real time, and to accurately calculate the state of charge and releaseable heat of the thermal storage unit through thermodynamic integration and temperature threshold algorithms.

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