Park-level integrated energy system comprising electric vehicles

Abstract

The invention relates to the field of comprehensive energy optimization utilization, in particular to the field of renewable energy and non-renewable energy composite energy optimization utilization. A park-level comprehensive energy system containing an electric vehicle comprises a wind power generation device and / or a photovoltaic power generation device, a natural gas network, an electricity storage device, a quick charging unit, the electric vehicle, an electric load, an ice storage system, a compression type refrigerator, a cold load, an absorption type refrigerator, a gas-steam combined cycle unit, a heat load and a heat storage device. An electric boiler; wherein electric energy generated by wind power generation and / or photovoltaic power generation, electric energy generated by the natural gas network through the gas-steam combined cycle unit and cold energy converted by waste heat discharged by the gas-steam combined cycle unit by the absorption refrigerator are jointly used as a total energy supply source of the park-level comprehensive energy system; the electricity used by the electric load, the cold used by the cold load, the heat used by the heat load and the electricity used by the electric vehicle are jointly used as the total energy of the park-level comprehensive energy system.

Description

Technical Field

[0001] The present invention relates to the field of comprehensive energy optimization and utilization, and in particular to the field of composite energy optimization and utilization of renewable energy and non-renewable energy. Background Art

[0002] With the widespread use of renewable energy such as wind and solar energy in the park, the uncertainty and volatility of power supply have increased significantly, and traditional power systems often need to frequently adjust loads. During the peak period of renewable energy generation during the day, traditional energy sources such as thermal power need to reduce loads to absorb excess electricity; while at night, when renewable energy generation decreases, the load needs to be quickly increased to meet power demand. This process not only tests the flexibility of thermal power unit scheduling, but also leads to inefficiency and accelerated equipment wear, which overall restricts the efficiency and stability of the power system.

[0003] The introduction of energy storage systems can effectively alleviate the above problems, storing excess electricity when there is excess renewable energy generation, and releasing stored electricity when there is insufficient generation, effectively shaving peaks and filling valleys, and reducing grid fluctuations. The integrated operation of energy storage and traditional power systems has greatly improved the flexibility and responsiveness of the system, ensuring that power supply can more accurately match actual demand changes, reducing unnecessary frequent start-ups and shutdowns of generators and drastic load changes, and thus improving the power system's ability to accept renewable energy.

[0004] The unique advantage of electric vehicles as a new type of energy storage resource lies in their high efficiency and flexibility in charging. However, during the charging process of electric vehicles, if the charging behavior is not properly planned and optimized, it may cause sharp fluctuations in power load, thereby threatening the overall stability and reliability of the power system. Summary of the invention

[0005] The technical problem to be solved by the present invention is: when renewable energy and non-renewable energy are coordinated to supply energy, how to more reasonably utilize renewable energy to meet energy demand.

[0006] The technical solution adopted by the present invention is: a park-level integrated energy system containing electric vehicles, the park-level integrated energy system includes wind power generation and / or photovoltaic power generation, natural gas network, power storage device, fast charging unit, electric vehicle, electric load, ice storage system, compression refrigerator, cold load, absorption refrigerator, gas-steam combined cycle unit, heat load, heat storage device, electric boiler; wherein, the electric energy generated by wind power generation and / or photovoltaic power generation, the electric energy generated by the natural gas network through the gas-steam combined cycle unit, the absorption refrigerator uses the waste heat discharged by the gas-steam combined cycle unit The converted cold energy is used as the total energy supply of the park-level comprehensive energy system. The electricity used by the electric load, the cold load, the heat used by the heat load, and the electricity used by electric vehicles are used as the total energy used by the park-level comprehensive energy system. The natural gas grid obtains natural gas from the outside, the power storage device is used to store and release electric energy, the heat storage device is used to store and release the waste heat generated in the gas-steam combined cycle unit and the heat generated by the electric boiler, the compression refrigerator and the absorption refrigerator are used for refrigeration, and the ice storage system is used to store and release cold energy. According to the load level n of the park-level comprehensive energy system in the i-th period i Set the electricity price p for the i-th period i , at the electricity price p i During the period when the electricity price is lower than the set electricity price, the electricity storage device stores electric energy, the heat storage device stores heat energy, the ice storage system stores cold energy, and the fast charging unit charges the electric vehicle. i During the period when the electricity price is higher than the set electricity price, the electricity storage device releases electricity, the heat storage device releases heat, and the ice storage system releases cold energy; a time interval is set to divide a day into r equal intervals, i is a natural number less than or equal to r, and the real-time load level n of the park-level integrated energy system in the i-th period is calculated. i Set the electricity price p for the i-th period i The following steps are included Step 1: Determine the load level n in the i-th period i , load level n in period i i is the real-time load of the integrated energy system in the i-th period l i The ratio of the load to the set load is n i= l i / l, the real-time load l i It refers to the total load of electricity used by electric load, cooling used by cooling load, and heating used by heating load in the i-th period; Step 2: Set the electricity price adjustment parameters. According to the fluctuation characteristics of total energy consumption, set the electricity price adjustment parameters: k1, k2, k3 and k4. The electricity price adjustment parameters are used to define the adjustment range of electricity prices under different load levels. <k1<k2<k3<k4; Step 3: Set a variable parameter m ,m It represents the proportion of all electric vehicle charging energy consumption in the total energy supply. The function of m is to fine-tune the adjustment range of electricity prices to better reflect the changes in load levels. Step 4: Set the electricity price p for the i-th period i and load level n in period i-1 i-1 The mapping relationship, When 0<n i-1 When ≤0.8, p i =(n i-1 -k2m)p0; When 0.8<n i-1 When ≤0.9, p i =(n i-1 -k1m)p0; When 0.9<n i-1 When p ≤ 1, i =(n i-1 -m)p0; When 1<n i When ≤1.1, p i =(n i-1 +m)p0; When 1.1<ni≤1.2, p i =(n i-1 + k1m)p0; When 1.2<ni≤1.3, p i =(n i-1 + k2m)p0; When 1.3<ni≤1.4, p i =(n i-1 + k3m)p0; When 1.4<ni, p i =(n i-1 + k4m)p0; Among them, p0 is the base electricity price; Step 5: Set price difference constraints: In order to prevent abnormal fluctuations in electricity prices and loads, the price difference between adjacent time periods is set to | p i -p i-1 |≤p max , p i-1 To set the electricity price for the i-1 period, p max The maximum value allowed for the price difference between adjacent periods; Step 6: Obtain the electricity price p for the i-th period according to steps 4 and 5 i .

[0007] The set load l is taken as the average value of the real-time load li in each time period of the previous day or multiple days. For the set load l of the first day, the real-time load value of the first time period of the first day is taken.

[0008] When the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than a set proportion, the power storage device stores electric energy, the heat storage device stores heat energy, and the ice storage system is used to store cold energy; when the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is less than a set proportion, the power storage device releases electric energy, the heat storage device releases heat energy, and the ice storage system is used to release cold energy.

[0009] When the absorption refrigeration system cannot meet the cooling load demand, the ice storage system starts to release cold energy for the cooling load. When the sum of the cooling energy released by the absorption refrigeration system and the ice storage system cannot meet the cooling load demand, the compression refrigeration system starts to release cold energy for the cooling load. When the waste heat generated in the gas-steam combined cycle unit cannot meet the heat load demand, the heat storage device starts to release heat energy for the heating load. When the sum of the waste heat generated in the gas-steam combined cycle unit and the heat energy released by the heat storage device cannot meet the heat load demand, the electric boiler starts to start heating for the heating load. The working principle of the present invention is that the waste heat generated by the gas-steam combined cycle unit is efficiently utilized in multiple ways, a part of which is supplied to the absorption refrigeration machine for waste heat conversion refrigeration, a part is stored in the heat storage device for subsequent use, and the remaining part directly serves the thermal energy demand of the park. The system adopts a real-time electricity price mechanism, which dynamically adjusts the electricity price according to the real-time working conditions of the system as an indicator reflecting the instant supply and demand status of the system. When the system load is low or renewable energy is sufficient, the real-time electricity price mechanism will indicate that the current electricity price is low, and the system adopts an energy storage strategy. The power storage device, heat storage device and ice storage system will use low-cost electricity to store electricity, heat and cold energy, while encouraging electric vehicles to charge quickly during this low electricity price window. When the system load is high or the supply of renewable energy is tight, the real-time electricity price mechanism will be reflected in the increase of electricity prices. At this time, the stored electricity and heat energy in the system will be released to supplement the demand, and the ice storage air conditioner will switch to ice melting cooling mode, using the stored cold energy to provide cooling, effectively alleviating the cooling pressure during peak hours.

[0010] The beneficial effects of the present invention are as follows: the present invention increases the total amount of energy storage and the speed of release by coordinating the use of power storage devices, ice storage systems, and heat storage devices to store energy. The present invention encourages users to use less electricity during peak periods and more electricity during low-peak periods through electricity prices in different time periods, thereby alleviating the problem of power shortage during peak periods. The present invention integrates the random fluctuation characteristics of renewable energy output, the specific needs of electric vehicle charging behavior, and the intelligent scheduling of overall energy storage resources. By real-time monitoring and dynamic adjustment of the working modes of each component, the present invention achieves the optimal configuration of power utilization and ensures efficient, smooth and highly stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0012] A park containing electric vehicles uses electricity generated by natural gas through a gas-steam combined cycle unit as the main energy supplier (electricity, heat, and cold energy), while auxiliary use of electricity generated by wind power and / or photovoltaic power installed in the park as an auxiliary energy supplier, and the use of absorption chillers to convert part of the waste heat emitted by the gas-steam combined cycle unit into cold energy as an auxiliary cold energy supplier. Electricity generated by wind power and / or photovoltaic power generation, electricity generated by the natural gas grid through a gas-steam combined cycle unit, and cold energy converted by absorption chillers using part of the waste heat emitted by the gas-steam combined cycle unit together serve as the total energy supply for the park-level integrated energy system. The park containing electric vehicles has no other energy suppliers.

[0013] Due to the high uncertainty and volatility of total energy supply, traditional power systems often need to frequently adjust loads, which leads to low efficiency and accelerated equipment wear.

[0014] The present invention introduces power storage devices, ice storage systems, heat storage devices and public electric vehicles in the park as energy storage equipment, and formulates electricity prices for different time periods, which encourages users to use less electricity during peak electricity consumption periods and more electricity during low-peak electricity consumption periods, effectively reducing the frequency of load adjustment of the power system.

[0015] A park-level integrated energy system including electric vehicles, the park-level integrated energy system includes wind power generation and / or photovoltaic power generation, natural gas grid, power storage device, fast charging unit, electric vehicle, electric load, ice storage system, compression refrigerator, cold load, absorption refrigerator, gas steam combined cycle unit, heat load, heat storage device, electric boiler; wind power generation and / or photovoltaic power generation, natural gas grid, power storage device, fast charging unit, electric vehicle, electric load, ice storage system, compression refrigerator, cold load, absorption refrigerator, gas steam combined cycle unit, heat load, heat storage device, electric boiler are all existing equipment and technology. The electric load is the power system, the cold load is the cold system, and the heat load is the heat system. The cold load and the heat load can exist at the same time or at intervals or any one of them can exist.

[0016] Among them, the electric energy generated by wind power generation and / or photovoltaic power generation, the electric energy generated by the natural gas grid through the gas-steam combined cycle unit, and the cold energy converted by the absorption refrigeration machine using the waste heat discharged by the gas-steam combined cycle unit are jointly used as the total energy supply of the park-level comprehensive energy system, and the electricity used by the electric load, the cold used by the cold load, the heat used by the heat load, and the electricity used by electric vehicles are jointly used as the total energy used by the park-level comprehensive energy system; the natural gas grid obtains natural gas from the outside, the electric storage device is used to store and release electric energy, the heat storage device is used to store and release the waste heat (part of the waste heat) generated in the gas-steam combined cycle unit and the heat generated by the electric boiler, the compression refrigeration machine and the absorption refrigeration machine are used for refrigeration, and the ice storage system is used to store and release cold energy. According to the load level n of the park-level comprehensive energy system in the i-th period i Set the electricity price p for the i-th period i , at the electricity price p i During the period when the electricity price is lower than the set electricity price, the electricity storage device stores electric energy, the heat storage device stores heat energy, the ice storage system is used to store cold energy, and the fast charging unit charges the electric vehicle. i During the period when the electricity price is higher than the set electricity price, the electricity storage device releases electricity, the heat storage device releases heat, and the ice storage system is used to release cold energy; set the time interval, divide a day into r equal intervals, i is a natural number less than or equal to r, according to the real-time load level n of the park-level integrated energy system in the i-th period i Set the electricity price p for the i-th period i The following steps are included Step 1: Determine the load level n in the i-th period i , load level n in period i i is the real-time load of the integrated energy system in the i-th period l i The ratio of the load to the set load is n i= l i / l, the real-time load l i It refers to the total load of electricity used by electric load, cooling load used by cooling load, and heating load used by heating load in the i-th period; in one embodiment, the load l is set to the load level n of the previous day or multiple days. i The average value of .

[0017] Step 2: Set the electricity price adjustment parameters. According to the fluctuation characteristics of total energy consumption, set the electricity price adjustment parameters: k1, k2, k3 and k4. The electricity price adjustment parameters are used to define the adjustment range of electricity prices under different load levels. <k1<k2<k3<k4; The electricity price adjustment parameter is determined according to the ratio of the electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply. In one embodiment, when the percentage of the electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is less than or equal to 10%, it corresponds to the fourth price adjustment parameter k4, and in one embodiment, k4=0.9. When the percentage of the electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than 10% and less than or equal to 30%, it corresponds to the third price adjustment parameter k3, and in one embodiment, k3=0.7. When the percentage of the electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than 30% and less than or equal to 50%, it corresponds to the second price adjustment parameter k2, and in one embodiment, k2=0.5. When the percentage of the electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than 50%, it corresponds to the first price adjustment parameter k1, and in one embodiment, k1=0.2.

[0018] Step 3: Set a variable parameter m , m It represents the proportion of all electric vehicle charging energy consumption in the total energy supply. The function of m is to fine-tune the adjustment range of electricity prices to better reflect changes in load levels. The minimum value of the variable parameter m depends on the system, 0≤m<1.

[0019] Step 4: Set the electricity price p for the i-th period i and load level n in period i-1 i-1 The mapping relationship, When 0<n i-1 When ≤0.8, p i =(n i-1 -k2m)p0; When 0.8<n i-1 When ≤0.9, p i =(n i-1 -k1m)p0; When 0.9<n i-1 When p ≤ 1, i =(n i-1 -m)p0; When 1<n i When ≤1.1, p i =(n i-1 +m)p0; When 1.1<ni≤1.2, p i =(n i-1 + k1m)p0; When 1.2<ni≤1.3, p i =(n i-1 + k2m)p0; When 1.3<ni≤1.4, p i =(n i-1+ k3m)p0; When 1.4<ni, p i =(n i-1 + k4m)p0; Among them, p0 is the benchmark electricity price.

[0020] Step 5: Set price difference constraints: In order to prevent abnormal fluctuations in electricity prices and loads, the price difference between adjacent time periods is set to | p i -p i-1 |≤p max , p i-1 To set the electricity price for the i-1 period, p max The maximum value allowed for the price difference between adjacent periods; Step 6: Obtain the electricity price p for the i-th period according to steps 4 and 5 i First, follow step 4 to obtain p i , if |p i -p i-1 |greater than p max , then p i = p i-1 ±p max , add p max Or minus p max Determine according to step 4.

[0021] When the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than a set proportion, the power storage device stores electric energy, the heat storage device stores heat energy, and the ice storage system is used to store cold energy; when the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is less than a set proportion, the power storage device releases electric energy, the heat storage device releases heat energy, and the ice storage system is used to release cold energy.

[0022] When the absorption refrigeration machine cannot meet the cooling load demand, the ice storage system starts to release cold energy for the cooling load. When the sum of the cooling energy released by the absorption refrigeration machine and the ice storage system cannot meet the cooling load demand, the compression refrigeration machine is started to supply the cooling load. When the waste heat generated in the gas-steam combined cycle unit cannot meet the thermal load demand, the heat storage device starts to release thermal energy for the heating load. When the sum of the waste heat generated in the gas-steam combined cycle unit and the thermal energy released by the heat storage device cannot meet the thermal load demand, the electric boiler starts to start heating and supply the heating load.

[0023] The absorption chiller utilizes part of the waste heat emitted by the gas-steam combined cycle unit and converts it into cold energy, thereby realizing efficient refrigeration application of waste heat resources; the heat storage device is used to store and release part of the waste heat generated during the gas-steam combined cycle unit, as well as the heat generated by electric boilers during peak power generation periods of wind power and photovoltaic power generation; the heat load can be flexibly dispatched, comprehensively utilizing part of the heat energy directly provided by the gas-steam combined cycle unit, the waste heat generated by electric boilers during peak power generation periods of wind power and photovoltaic power generation, and the heat released on demand by the heat storage device.

[0024] The power storage device stores the excess power generated by wind power and photovoltaic power generation during peak power generation periods, as well as the power contributed by gas-steam combined cycle units, so as to release the stored power when power demand is high or renewable energy generation decreases; electric vehicles, as mobile energy storage devices, intelligently adjust their charging and discharging behaviors according to the real-time electricity price of the system, and give priority to charging during periods with lower electricity prices, such as at night or during peak wind and photovoltaic power generation periods. The electric load can directly use the power of wind power photovoltaic and gas-steam combined cycle units, as well as the power released by the power storage device and electric vehicles when the system load is high or the wind power photovoltaic output is low.

[0025] The compression chiller makes full use of the clean electricity generated by wind power and photovoltaic power and the electricity provided by the gas-steam combined cycle unit to provide efficient cooling to provide cooling load; the ice storage system actively stores cold energy when electricity prices are low and uses electricity to make ice. When electricity demand is high or electricity prices are peak, the system releases the pre-stored cold energy through ice melting mode, supplying a stable cold source for the cooling load and reducing operating costs; the cooling load can not only directly utilize the waste heat converted by the absorption chiller for cooling and the electric cooling of the compression chiller, but also flexibly dispatch the cold energy released by the ice storage system on demand, greatly improving the stability and flexibility of the cooling load supply.

[0026] The system's operating status is judged by the system's real-time electricity price. When the system load is low or renewable energy is sufficient, the electricity price is low. When the system is at a higher load level, in order to adjust the system's operating status and optimize the system's operation, the electricity price should be at a higher level. The real-time electricity price for the current time period is given based on the system's operating status in the previous time period.

[0027] By enhancing the integration capability of renewable energy, the energy utilization efficiency of the system is improved. The integrated energy system cleverly integrates power storage devices, heat storage devices, ice storage systems and electric vehicles as dynamic energy storage tools, ensuring the efficient use of wind power and photovoltaic power during peak periods, avoiding the occurrence of wind and solar power abandonment, and maximizing the use of renewable energy.

[0028] The smoothness and stability of system operation are improved. The real-time electricity price mechanism introduced can dynamically adjust the electricity price according to the instantaneous load of the system, effectively suppressing load fluctuations. During the period of high system load, the electricity price will be raised according to the real-time electricity price mechanism. The high electricity price will reduce the charging demand of electric vehicles during this period, and the demand side will reduce the power consumption, thereby reducing the system load; when the system load is low, the low electricity price will stimulate the charging demand of electric vehicles during this period, and the demand side will increase the power load, promoting the effective consumption of energy in the system.

[0029] Through the use of the time-of-use electricity price mechanism, electric vehicles connected to the integrated energy system can be charged during low-price periods and release stored electricity during high-price periods to participate in grid regulation, which not only effectively reduces the charging costs of electric vehicle users, but also enables them to obtain dispatch compensation. At the same time, the system relies on the energy management system to store electricity and cold energy during peak wind and photovoltaic power generation periods. During the peak period of natural gas power generation, the system can rely on pre-stored electricity, heat and cold energy for supply, reduce the purchase of natural gas, and reduce system operating costs. This strategy not only improves energy utilization efficiency, but also reduces the impact on the environment, achieving a win-win situation for economy and environmental protection.

Claims

1. A park-level integrated energy system including electric vehicles, characterized in that: The park-level comprehensive energy system includes wind power generation and / or photovoltaic power generation, natural gas grid, power storage device, fast charging unit, electric vehicle, electric load, ice storage system, compression refrigerator, cold load, absorption refrigerator, gas-steam combined cycle unit, heat load, heat storage device, electric boiler; wherein, the electric energy generated by wind power generation and / or photovoltaic power generation, the electric energy generated by the natural gas grid through the gas-steam combined cycle unit, and the cold energy converted by the absorption refrigerator using the waste heat discharged by the gas-steam combined cycle unit are jointly used as the total energy supply of the park-level comprehensive energy system, and the electricity used by the electric load, the cold used by the cold load, the heat used by the heat load, and the electricity used by the electric vehicle are jointly used as the total energy used by the park-level comprehensive energy system; the natural gas grid obtains natural gas from the outside, the power storage device is used to store and release electric energy, the heat storage device is used to store and release the waste heat generated in the gas-steam combined cycle unit and the heat generated by the electric boiler, the compression refrigerator and the absorption refrigerator are used for cooling, and the ice storage system is used to store and release cold energy, according to the load level n of the park-level comprehensive energy system in the i-th period i Set the electricity price p for the i-th period i , at the electricity price p i During the period when the electricity price is lower than the set electricity price, the electricity storage device stores electric energy, the heat storage device stores heat energy, the ice storage system stores cold energy, and the fast charging unit charges the electric vehicle. i During the period when the electricity price is higher than the set electricity price, the electricity storage device releases electricity, the heat storage device releases heat, and the ice storage system releases cold energy; a time interval is set to divide a day into r equal intervals, i is a natural number less than or equal to r, and the real-time load level n of the park-level integrated energy system in the i-th period is calculated. i Set the electricity price p for the i-th period i The following steps are included Step 1: Determine the load level n in the i-th period i , load level n in period i i is the real-time load of the integrated energy system in the i-th period l i The ratio of the load to the set load is n i= l i / l, the real-time load l i It refers to the total load of electricity used by electric load, cooling used by cooling load, and heating used by heating load in the i-th period; Step 2: Set the electricity price adjustment parameters. According to the fluctuation characteristics of total energy consumption, set the electricity price adjustment parameters: k1, k2, k3 and k4. The electricity price adjustment parameters are used to define the electricity price adjustment range under different load levels. 0< k1 <k2<k3<k4; Step 3: Set a variable parameter m , m It represents the proportion of all electric vehicle charging energy consumption in the total energy supply. The function of m is to fine-tune the adjustment range of electricity prices to better reflect the changes in load levels. Step 4: Set the electricity price p for the i-th period i and load level n in period i-1 i-1 The mapping relationship, When 0<n i-1 When ≤0.8, p i =(n i-1 -k2m)p0; When 0.8<n i-1 When ≤0.9, p i =(n i-1 -k1m)p0; When 0.9<n i-1 When p ≤ 1, i =(n i-1 -m)p0; When 1<n i When ≤1.1, p i =(n i-1 +m)p0; When 1.1<ni≤1.2, p i =(n i-1 + k1m)p0; When 1.2<ni≤1.3, p i =(n i-1 + k2m)p0; When 1.3<ni≤1.4, p i =(n i-1 + k3m)p0; When 1.4<ni, p i =(n i-1 + k4m)p0; Among them, p0 is the base electricity price; Step 5: Set price difference constraints: In order to prevent abnormal fluctuations in electricity prices and loads, the price difference between adjacent time periods is set to | p i -p i-1 |≤p max , p i-1 To set the electricity price for the i-1 period, p max The maximum value allowed for the price difference between adjacent periods; Step 6: Obtain the electricity price p for the i-th period according to steps 4 and 5 i .

2. A park-level integrated energy system containing electric vehicles according to claim 1, characterized in that: The set load l is the real-time load l of each period of the previous day or days. i For the set load l on the first day, the real-time load value of the first period of the first day is taken.

3. The park-level integrated energy system containing electric vehicles according to claim 1, characterized in that: When the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is greater than a set proportion, the power storage device stores electric energy, the heat storage device stores heat energy, and the ice storage system is used to store cold energy; when the proportion of electric energy generated by wind power generation and / or photovoltaic power generation to the total energy supply is less than a set proportion, the power storage device releases electric energy, the heat storage device releases heat energy, and the ice storage system is used to release cold energy.

4. The park-level integrated energy system containing electric vehicles according to claim 1, characterized in that: When the absorption refrigeration machine cannot meet the cooling load demand, the ice storage system starts to release cold energy for the cooling load. When the sum of the cooling energy released by the absorption refrigeration machine and the ice storage system cannot meet the cooling load demand, the compression refrigeration machine is started to supply the cooling load. When the waste heat generated in the gas-steam combined cycle unit cannot meet the thermal load demand, the heat storage device starts to release thermal energy for the heating load. When the sum of the waste heat generated in the gas-steam combined cycle unit and the thermal energy released by the heat storage device cannot meet the thermal load demand, the electric boiler starts to start heating and supply the heating load.

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