Microgrid electric-thermal hybrid energy storage system and method

Abstract

The application discloses a micro-grid electric-thermal hybrid energy storage system and method, relates to the technical field of power supply, heat supply and energy storage, and comprises an electric energy storage system, a heat-conducting oil furnace system and a hybrid energy storage controller. The hybrid energy storage controller is used for acquiring first operation data of an energy supply system, and controls the electric energy storage system to perform charging and discharging operation in the case that the energy supply system is determined to be unstable based on the first operation data. The hybrid energy storage controller is connected with an external power distribution system, the external power distribution system comprises a second load, and the hybrid energy storage controller is further used for acquiring second operation data of the external power distribution system, and controls the electric energy storage system to perform charging and discharging operation and / or the heat-conducting oil furnace system to enter an external heat release state in the case that the external power distribution system is determined to be unstable based on the second operation data. The application aims to solve the problems of poor stability and low energy utilization rate of the micro-grid in the prior art, and realizes the improvement of the stability and energy utilization rate of the micro-grid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, heat supply and energy storage, and in particular to a micro-grid electric-thermal hybrid energy storage system and method. BACKGROUND

[0002] At present, the country vigorously develops renewable energy to utilize renewable energy for energy supply. However, renewable energy has the characteristics of instability, which causes a series of problems, for example, a large amount of wind curtailment and light curtailment phenomenon, causing energy waste, and for example, affecting the safety and stability of the micro-grid, causing frequency and voltage fluctuations, etc.

[0003] In the prior art, in order to solve the problem of energy waste, an energy storage system is applied to the micro-grid of renewable energy to utilize the charge and discharge function of the battery of the energy storage system to achieve the purpose of saving energy. At present, there are still problems of poor stability of the micro-grid and low energy utilization rate. SUMMARY

[0004] The present application proposes a micro-grid electric-thermal hybrid energy storage system and method to solve the problems of poor stability of the micro-grid and low energy utilization rate in the prior art, and to improve the stability and energy utilization rate of the micro-grid.

[0005] The micro-grid electric-thermal hybrid energy storage system provided by the embodiments of the present application comprises an electric energy storage system, a heat conducting oil furnace system and a hybrid energy storage controller.

[0006] The electric energy storage system and the heat conducting oil furnace system are connected, and the electric energy storage system and the heat conducting oil furnace system are respectively in communication connection with the hybrid energy storage controller.

[0007] The electric energy storage system is connected with an energy supply system, and the energy supply system is used to provide energy for the electric energy storage system and the heat conducting oil furnace system. The energy provided by the energy supply system is surplus energy, and the surplus energy is the difference between the total energy that the energy supply system can provide and the demand energy of a first load corresponding to the energy supply system under normal operation.

[0008] The hybrid energy storage controller is used to acquire first running data of the energy supply system, and in the case that it is determined based on the first running data that the energy supply system is unstable, the electric energy storage system is controlled to perform charge and discharge operation to adjust the stability of the energy supply system and the normal operation of the first load.

[0009] The mixed energy storage controller is connected with an external power distribution system, the external power distribution system comprises a second load, the mixed energy storage controller is further configured to acquire second operation data of the external power distribution system, in a case where it is determined that the external power distribution system is unstable based on the second operation data, control the electric energy storage system to perform charging and discharging operation, and / or control the heat conducting oil furnace system to enter an external heat release state, so as to adjust the stability of the external power distribution system and provide energy for the second load of the external power distribution system.

[0010] According to an embodiment of the micro-grid electric-thermal mixed energy storage system, the mixed energy storage controller is configured to, in a case where it is determined that the energy supply system is unstable, control the electric energy storage system to enter a peak regulation state, acquire a first stability demand parameter of the energy supply system and a first load demand parameter of the first load, and control the electric energy storage system to perform charging and discharging operation based on the first stability demand parameter and the first load demand parameter.

[0011] According to an embodiment of the micro-grid electric-thermal mixed energy storage system, the mixed energy storage controller is further configured to, in a case where it is determined that the external power distribution system is unstable, acquire a second stability demand parameter of the external power distribution system, a second load demand parameter of the second load and a load type of the second load, control the electric energy storage system to perform charging and discharging operation based on the second stability demand parameter, the second load demand parameter and the load type, and / or control the heat conducting oil furnace system to enter an external heat release state.

[0012] According to an embodiment of the micro-grid electric-thermal mixed energy storage system, the mixed energy storage controller is configured to judge whether the mixed energy storage system is in a charging state, in a case where it is determined that the mixed energy storage system is in the charging state, charge the electric energy storage system based on the remaining energy and store heat in the heat conducting oil furnace system, and in a case where it is determined that the mixed energy storage system is not in the charging state, control the electric energy storage system and the working state of the heat conducting oil furnace system based on the remaining capacity of the mixed energy storage system.

[0013] According to an embodiment of the micro-grid electric-thermal mixed energy storage system, the mixed energy storage controller is configured to, in a case where it is determined that the mixed energy storage system is in the charging state and the remaining capacity is less than a first preset capacity, charge the electric energy storage system based on the remaining energy and store heat in the heat conducting oil furnace system, and in a case where it is determined that the mixed energy storage system is in the charging state and the remaining capacity is greater than or equal to the first preset capacity, control the mixed energy storage system to be in a floating charging state.

[0014] The hybrid energy storage controller is configured to, when it is determined that the hybrid energy storage system is not in the charging state, determine the relationship between the remaining capacity and a second preset capacity; when it is determined that the remaining capacity is greater than the second preset capacity, control the electric energy storage system to discharge and / or release heat to the thermal oil boiler system; and when it is determined that the remaining capacity is less than or equal to the second preset capacity, control the electric energy storage system and the thermal oil boiler system to stop supplying energy and enter a standby state;

[0015] The first preset capacity is greater than the second preset capacity.

[0016] According to a microgrid electric-thermal hybrid energy storage system of one embodiment of the present application, the hybrid energy storage controller is further configured to control the electric energy storage system and the thermal oil boiler system to be in a charging state or a floating charging state when it is determined that the energy supply system is stable based on the first operating data.

[0017] According to a microgrid electric-thermal hybrid energy storage system of one embodiment of the present application, the electric energy storage system and the thermal oil furnace system are connected via an electric heater-type power supply, and the electric heater-type power supply is used to power the electric heater of the thermal oil furnace system.

[0018] According to a microgrid electric-thermal hybrid energy storage system according to an embodiment of the present application, the electric energy storage system includes: at least one battery cluster and at least one energy storage converter, wherein one battery cluster corresponds to one energy storage converter;

[0019] The battery cluster and the energy storage converter are integrated via an AC bus;

[0020] Each battery cluster includes at least one group of batteries, and each group of batteries is connected in series to form the battery cluster.

[0021] According to a microgrid electric-thermal hybrid energy storage system of one embodiment of the present application, the energy storage converter is connected to the hybrid energy storage controller;

[0022] The hybrid energy storage controller is used to control the charge and discharge of the batteries in the battery cluster by controlling the energy storage converter.

[0023] The present application also provides a microgrid electric-thermal hybrid energy storage method, which is applied to the microgrid electric-thermal hybrid energy storage system described in any of the above embodiments. The method includes:

[0024] obtaining first operating data of an energy supply system, and, if it is determined based on the first operating data that the energy supply system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations to adjust the stability of the energy supply system and the normal operation of a first load of the energy supply system;

[0025] obtaining second operating data of the external power distribution system; and, if it is determined based on the second operating data that the external power distribution system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations, and / or causing the thermal oil furnace system to enter a state of releasing heat to the outside, so as to adjust the stability of the external power distribution system and provide energy for a second load of the external power distribution system.

[0026] The microgrid electric-thermal hybrid energy storage system and method provided in the embodiment of the present application, the hybrid energy storage system includes: an electric energy storage system, a thermal oil furnace system and a hybrid energy storage controller; an energy supply system, which is used to provide energy for the electric energy storage system and the thermal oil furnace system, wherein the energy provided by the energy supply system is residual energy, and the residual energy is the difference between the total energy that the energy supply system can provide and the energy required by the first load corresponding to the energy supply system under normal operation. It can be seen that the present application recycles and utilizes the excess energy of the energy supply system to avoid energy waste; furthermore, the hybrid energy storage controller is used to obtain the first operating data of the energy supply system, and when it is determined based on the first operating data that the energy supply system is unstable, the electric energy storage system is controlled to perform charging and discharging operations to adjust the stability and Normal operation of the first load, and obtaining the second operating data of the external power distribution system. When it is determined based on the second operating data that the external power distribution system is operating unstable, the electric energy storage system is controlled to perform charging and discharging operations, and / or the thermal oil furnace system enters an external heat release state to adjust the stability of the external power distribution system and provide energy for the second load of the external power distribution system. It can be seen that the present application provides energy for the stable operation of the energy supply system by monitoring the operation of the energy supply system, and provides energy for the stable operation of the external power distribution system by monitoring the operation of the external power distribution system, and provides energy for the normal operation of the second load, thereby achieving the purpose of improving resource utilization and stable operation of the microgrid, and solving the problems of poor stability and poor energy utilization of the microgrid in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is one of the structural diagrams of the microgrid electric-thermal hybrid energy storage system provided in the embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the control flow of the microgrid electric-thermal hybrid energy storage system provided in an embodiment of the present application;

[0030] Figure 3This is the second structural diagram of the microgrid electric-thermal hybrid energy storage system provided in an embodiment of the present application;

[0031] Figure 4 A schematic flow chart of a microgrid electric-thermal hybrid energy storage method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The microgrid electric-thermal hybrid energy storage system provided in the embodiment of the present application is as follows: Figure 1 As shown, it includes: an electric energy storage system 101, a thermal oil furnace system 102 and a hybrid energy storage controller 103.

[0034] The electric energy storage system 101 is connected to the thermal oil furnace system 102 , and the electric energy storage system 101 and the thermal oil furnace system 102 are respectively communicatively connected to the hybrid energy storage controller 103 .

[0035] The electric energy storage system 101 is connected to the energy supply system, which is used to provide energy to the electric energy storage system 101 and the thermal oil furnace system 102.

[0036] The hybrid energy storage controller 103 is configured to obtain first operating data of the energy supply system, and when it is determined based on the first operating data that the energy supply system is operating unstably, control the electric energy storage system 101 to perform charging and discharging operations to adjust the stability of the energy supply system and the normal operation of the first load.

[0037] The hybrid energy storage controller 103 is connected to an external power distribution system, which includes a second load. The hybrid energy storage controller 103 is also used to obtain second operating data of the external power distribution system. When it is determined based on the second operating data that the external power distribution system is operating unstably, the hybrid energy storage controller 103 controls the electric energy storage system 101 to perform charging and discharging operations, and / or the thermal oil boiler system 102 enters a heat release state to adjust the stability of the external power distribution system and provide energy for the second load of the external power distribution system.

[0038] The energy provided by the energy supply system is surplus energy, which is the difference between the total energy the energy supply system can provide and the energy required by the first load corresponding to the energy supply system under normal operation. This surplus energy can include the electricity corresponding to the abandoned photovoltaic power generation during the day, the abandoned wind power generation system, and so on.

[0039] Specifically, the heat conduction oil furnace system in the hybrid energy storage system utilizes electric energy storage, and then supplies heat to a heat load through heat conduction oil.

[0040] The micro-grid electric-thermal hybrid energy storage system provided by the embodiment of the present application comprises an electric energy storage system, a heat conduction oil furnace system, and a hybrid energy storage controller; an energy supply system for providing energy for the electric energy storage system and the heat conduction oil furnace system, wherein the energy provided by the energy supply system is surplus energy, and the surplus energy is the difference between the total energy that can be provided by the energy supply system and the required energy of a first load corresponding to the energy supply system under normal operation. It can be seen that the present application recycles the excess energy of the energy supply system, thereby avoiding waste of energy. Furthermore, the hybrid energy storage controller is configured to acquire first operation data of the energy supply system, control the electric energy storage system to perform charging and discharging operations in a case where it is determined based on the first operation data that the energy supply system is unstable, so as to adjust the stability of the energy supply system and the normal operation of the first load, acquire second operation data of an external power distribution system, and control the electric energy storage system to perform charging and discharging operations and / or the heat conduction oil furnace system to enter an external heat release state in a case where it is determined based on the second operation data that the external power distribution system is unstable, so as to adjust the stability of the external power distribution system and provide energy for a second load of the external power distribution system. It can be seen that the present application monitors the operation of the energy supply system to provide energy for stable operation of the energy supply system, and monitors the operation of the external power distribution system to provide energy for stable operation of the external power distribution system and normal operation of the second load, thereby achieving the purposes of improving resource utilization and stable operation of the micro-grid, and solving the problems of poor stability and poor energy utilization of the micro-grid in the prior art.

[0041] In one specific embodiment, the electric energy storage system 101 comprises at least one battery cluster and at least one energy storage converter, and one battery cluster corresponds to one energy storage converter; the battery cluster and the energy storage converter are integrated through an alternating current bus.

[0042] Each battery cluster comprises at least one group of batteries, and each group of batteries is connected in series to form a battery cluster.

[0043] Specifically, the battery cluster and the energy storage converter adopt a unit wiring mode. The number of the battery cluster and the energy storage converter and the energy storage capacity of the battery cluster can be set according to actual needs, and the present application does not make any limitation.

[0044] Specifically, the battery cluster is connected to the low-voltage side of the energy storage converter, the high-voltage side of the energy storage converter is connected to one end of a direct current bus, and the other end of the direct current bus is connected to the energy supply system. The energy storage converter is bidirectional and can realize charging and discharging functions.

[0045] Specifically, a thermal oil boiler system primarily consists of a thermal oil storage tank, an electric heater, and a heat exchanger. The main process flow involves the following: When heat storage is needed, the electric heater heats the thermal oil in the storage tank and stores it to maintain its heat. When heat release is required, the heated thermal oil flows through a pipeline and then through a heat exchanger to heat an external medium.

[0046] In a specific embodiment, the energy storage converter is connected to the hybrid energy storage controller 103. The hybrid energy storage controller 103 is configured to control the charge and discharge of the batteries in the battery cluster by controlling the energy storage converter.

[0047] In a specific embodiment, the electric energy storage system 101 and the thermal oil furnace system 102 are connected via an electric heater power supply, which is used to power the electric heater of the thermal oil furnace system.

[0048] Specifically, the DC power from the energy supply system can be used to directly power the electric heater (i.e., the electric heater directly receives power through the DC bus), thereby heating the thermal oil in the thermal oil storage tank. Alternatively, the DC power from the energy supply system can be used to power an electric heater power supply. When thermal energy is needed, the electric heater power supply can be used to power the electric heater to heat the thermal oil in the thermal oil storage tank.

[0049] In a specific embodiment, the hybrid energy storage controller 103 is used to control the electric energy storage system 101 to enter a peak-shaving state when it is determined that the energy supply system is operating unstably, obtain a first stable demand parameter of the energy supply system and a first load demand parameter of the first load, and control the electric energy storage system to perform charging and discharging operations based on the first stable demand parameter and the first load demand parameter.

[0050] Specifically, when the fluctuation frequency of the first voltage corresponding to the energy supply system is greater than a preset frequency, and / or the fluctuation voltage difference of the first voltage is greater than a preset voltage difference, it is determined that the energy supply system is operating unstably.

[0051] Among them, the energy supply system includes power grids, new energy equipment, etc.

[0052] The following is a schematic explanation using the power grid as an example:

[0053] A first stability demand parameter of the power grid and a first load demand parameter of the first load are obtained, and based on the first stability demand parameter and the first load demand parameter, the electric energy storage system is controlled to perform charging and discharging operations.

[0054] The first stable demand parameters include: voltage and frequency corresponding to the power grid, and the first load demand parameters include: voltage, current and power corresponding to the load.

[0055] Specifically, based on the current operating parameters and first stable demand parameters of the power grid, as well as the current operating parameters and first load demand parameters of the load, the batteries in the electric energy storage system are controlled to perform charging and discharging operations to maintain stable operation of the power grid and normal operation of the load.

[0056] In a specific embodiment, the hybrid energy storage controller 103 is further used to obtain a second stability demand parameter of the external power distribution system, a second load demand parameter of the second load, and a load type of the second load when it is determined that the external power distribution system is operating unstably, and based on the second stability demand parameter, the second load demand parameter, and the load type, control the electric energy storage system to perform charging and discharging operations, and / or control the thermal oil furnace system to enter an external heat release state.

[0057] The external power distribution system includes a power supply, which supplies power to at least one second load.

[0058] The second stability requirement parameters include: the output voltage of the power supply and the temperature of the power supply, etc. The second load requirement parameters include: the voltage, current, power corresponding to the load and the temperature required for normal operation of the load, etc.

[0059] The following uses an external power distribution system as an example to illustrate the power supply:

[0060] A second stability requirement parameter of the power supply, a second load requirement parameter of the second load, and a load type of each second load are obtained.

[0061] This application determines the load type based on the purpose of the load. For example, if the load needs to receive thermal energy, its load type is a thermal load. If the load needs to receive electrical energy, its load type is an electrical load. If the load can receive both thermal energy and electrical energy, its load type is a comprehensive load.

[0062] When the load type is a thermal load, based on the second stable demand parameter and the second load demand parameter, the thermal oil furnace system is controlled to enter a state of external heat release; when the load type is an electrical load, based on the second stable demand parameter and the second load demand parameter, the electric energy storage system is controlled to perform charging and discharging operations; when the load type is a comprehensive load, the electric energy storage system is controlled to perform charging and discharging operations, and / or the thermal oil furnace system is controlled to enter a state of external heat release.

[0063] In a specific embodiment, the hybrid energy storage controller 103 is used to determine whether the hybrid energy storage system is in a charging state. If it is determined that the hybrid energy storage system is in a charging state, the controller 103 charges the electric energy storage system and stores heat in the thermal oil boiler system based on the remaining energy. If it is determined that the hybrid energy storage system is not in a charging state, the controller 103 controls the operating state of the electric energy storage system and the thermal oil boiler system based on the remaining capacity of the hybrid energy storage system.

[0064] The state of the hybrid energy storage system when the energy supply system transmits energy to the hybrid energy storage system is defined as a charging state.

[0065] Specifically, the energy supply system is connected to the electric energy storage system and the hybrid energy storage system via a DC bus. The DC bus transmits the surplus energy to the electric energy storage system for charging and to the thermal oil boiler system.

[0066] The remaining capacity is the percentage of the hybrid energy storage system's capacity. This value is a comprehensive coefficient based on the battery capacity of the electric energy storage system and the temperature of the thermal oil in the thermal oil furnace system. The specific method for determining this value can be set by the user based on their actual needs and is not limited by this application.

[0067] In a specific embodiment, the hybrid energy storage controller 103 is configured to charge the electric energy storage system and store heat in the thermal oil furnace system based on the remaining energy when it is determined that the hybrid energy storage system is in a charging state and the remaining capacity is less than a first preset capacity; and to control the hybrid energy storage system to be in a floating charge state when it is determined that the hybrid energy storage system is in a charging state and the remaining capacity is greater than or equal to the first preset capacity.

[0068] The hybrid energy storage controller 103 is configured to, when it is determined that the hybrid energy storage system is not in a charging state, determine the relationship between the remaining capacity and a second preset capacity; when it is determined that the remaining capacity is greater than the second preset capacity, control the electric energy storage system to discharge and / or release heat to the thermal oil boiler system; and when it is determined that the remaining capacity is less than or equal to the second preset capacity, control the electric energy storage system and the thermal oil boiler system to stop supplying energy and enter a standby state.

[0069] The first preset capacity is greater than the second preset capacity.

[0070] Specifically, through Figure 2 The control process of the hybrid energy storage controller 103 is schematically described as follows:

[0071] Step 201 , determining whether the hybrid energy storage system is in a charging state, if so, executing step 202 , otherwise executing step 205 .

[0072] Step 202: Use the energy output by the energy supply system to charge the battery of the electric energy storage system, and energize the electric heater of the thermal oil furnace system to heat the thermal oil for thermal energy storage.

[0073] Step 203 , determining whether the remaining capacity is less than the first preset capacity, if so, executing step 202 , otherwise executing step 204 .

[0074] Step 204: Control the hybrid energy storage system to be in a floating charge state.

[0075] Step 205 , determining whether the remaining capacity is greater than a second preset capacity, if so, executing step 206 , otherwise executing step 207 .

[0076] Step 206: Control the electric energy storage system to discharge and / or release heat to the thermal oil furnace system.

[0077] Step 207: Control the electric energy storage system and the thermal oil furnace system to stop supplying energy and enter a standby state.

[0078] In a specific embodiment, the hybrid energy storage controller 103 is further configured to control the electric energy storage system and the thermal oil boiler system to be in a charging state or a floating charging state when it is determined based on the first operating data that the energy supply system is stable.

[0079] Moreover, at this time, the battery cluster and energy storage converter combination can realize automatic charging and discharging operations according to the remaining power of its own battery.

[0080] Next, through Figure 3 The hybrid energy storage system of this application is specifically illustrated:

[0081] The thermal oil furnace system is illustrated as including a thermal oil storage tank 301 , an electric heater 302 , an electric heater power supply 303 and a heat exchanger 304 .

[0082] Take the electric energy storage system including the energy storage converter 305 and the battery cluster 306 as an example. Figure 3 In the figure, two groups of energy storage converters 305 and battery clusters 306 are used as an example for illustration, which is only for illustration and is not intended to limit the scope of protection of the present application.

[0083] The DC bus 307 is indicated by a thick line.

[0084] In addition, the energy storage converter 305 is connected to the battery cluster 306 via an on / off switch 308 , the energy storage converter 306 is connected to the DC bus 307 via an on / off switch 308 , and the electric heater power supply 303 is connected to the DC bus 307 via an on / off switch 308 .

[0085] The hybrid energy storage controller 103 is connected to each energy storage converter 305 (in Figure 3 For the sake of clarity in the drawings, only one energy storage converter 305 is shown as a connection diagram), the hybrid energy storage controller 103 is connected to the electric heater 302 , and the hybrid energy storage controller 103 is connected to the heat exchanger 304 .

[0086] In addition, the DC bus 307 is connected to the energy supply system via a circuit breaker, and the hybrid energy storage controller 103 is connected to the circuit breaker, and connection or disconnection with the energy supply system is achieved by controlling the on and off of the circuit breaker.

[0087] This application addresses the existing problems of poor stability and energy utilization in microgrids powered by renewable energy, improving their stability and energy utilization. It can also simultaneously meet both heating and power supply needs, achieving peak load regulation and grid stabilization. The output of both electrical and thermal energy can meet the needs of multiple scenarios.

[0088] This application utilizes surplus energy to improve energy utilization, storing it as both electrical and thermal energy, and increasing storage diversity. Furthermore, by leveraging the characteristics of electrical and thermal energy, performance complementarity is achieved. For example, batteries are suitable for fast-response scenarios but have a short energy storage time, while thermal oil boilers have a longer energy storage time. By leveraging their respective characteristics, the hybrid energy storage system achieves an optimal balance between power output, response speed, and energy storage capacity.

[0089] In addition, hybrid energy storage systems can optimize work distribution and reduce dependence on single energy storage components. In particular, they can reduce the number of battery charge and discharge cycles and significantly increase battery life.

[0090] The present application also provides a microgrid electric-thermal hybrid energy storage method, which is applied to the microgrid electric-thermal hybrid energy storage system described in any of the above embodiments. The repeated parts will not be described again. Figure 4 As shown, the method includes:

[0091] Step 401: Acquire first operating data of an energy supply system. When it is determined based on the first operating data that the energy supply system is operating unstably, control the electric energy storage system to perform charging and discharging operations to adjust the stability of the energy supply system and the normal operation of a first load of the energy supply system.

[0092] Step 402: Obtain second operating data of the external power distribution system. If it is determined based on the second operating data that the external power distribution system is operating unstably, control the electric energy storage system to perform charging and discharging operations, and / or control the thermal oil boiler system to enter a state of external heat release, so as to adjust the stability of the external power distribution system and provide energy for a second load of the external power distribution system.

[0093] In a specific embodiment, when it is determined based on the first operating data that the energy supply system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations is specifically implemented as follows:

[0094] When it is determined that the energy supply system is operating unstable, the electric energy storage system is controlled to enter a peak-shaving state, a first stable demand parameter of the energy supply system and a first load demand parameter of the first load are obtained, and based on the first stable demand parameter and the first load demand parameter, the electric energy storage system is controlled to perform charging and discharging operations.

[0095] In a specific embodiment, when it is determined based on the second operating data that the external power distribution system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations, and / or causing the thermal oil furnace system to enter a state of external heat release, is specifically implemented as follows:

[0096] When it is determined that the external power distribution system is operating unstably, a second stability demand parameter of the external power distribution system, a second load demand parameter of the second load, and a load type of the second load are obtained; based on the second stability demand parameter, the second load demand parameter, and the load type, the electric energy storage system is controlled to perform charging and discharging operations, and / or the thermal oil furnace system is controlled to enter a state of external heat release.

[0097] In a specific embodiment, it is determined whether the hybrid energy storage system is in a charging state. If it is determined that the hybrid energy storage system is in a charging state, the electric energy storage system is charged and the thermal oil boiler system is stored with heat based on the remaining energy. If it is determined that the hybrid energy storage system is not in a charging state, the operating status of the electric energy storage system and the thermal oil boiler system is controlled based on the remaining capacity of the hybrid energy storage system.

[0098] In a specific embodiment, when it is determined that the hybrid energy storage system is in a charging state and the remaining capacity is less than a first preset capacity, the electric energy storage system is charged and the thermal oil furnace system is stored with heat based on the remaining energy; when it is determined that the hybrid energy storage system is in a charging state and the remaining capacity is greater than or equal to the first preset capacity, the hybrid energy storage system is controlled to be in a floating charge state;

[0099] a hybrid energy storage controller, configured to, if it is determined that the hybrid energy storage system is not in a charging state, determine the relationship between the remaining capacity and a second preset capacity; if it is determined that the remaining capacity is greater than the second preset capacity, control the electric energy storage system to discharge and / or release heat to the thermal oil boiler system; and if it is determined that the remaining capacity is less than or equal to the second preset capacity, control the electric energy storage system and the thermal oil boiler system to stop supplying energy and enter a standby state;

[0100] The first preset capacity is greater than the second preset capacity.

[0101] In a specific embodiment, when it is determined based on the first operating data that the energy supply system is stable, the electric energy storage system and the thermal oil boiler system are controlled to be in a charging state or a floating charging state.

[0102] Finally, it should be noted that the above are only preferred embodiments of the present application and the present application is not limited to the above embodiments. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the scope of protection of the present application.

Claims

1. A microgrid electric-thermal hybrid energy storage system, characterized in that: The hybrid energy storage system includes: an electric energy storage system, a thermal oil furnace system and a hybrid energy storage controller; The electric energy storage system is connected to the thermal oil furnace system, and the electric energy storage system and the thermal oil furnace system are respectively communicatively connected to the hybrid energy storage controller; The electric energy storage system is connected to an energy supply system, and the energy supply system is used to provide energy for the electric energy storage system and the thermal oil furnace system, wherein the energy provided by the energy supply system is surplus energy, which is the difference between the total energy that can be provided by the energy supply system and the energy required by the first load corresponding to the energy supply system under normal operation. The surplus energy is the electricity corresponding to the abandoned photovoltaic power generation part during the day and the electricity corresponding to the abandoned wind power generation part of the wind power generation system; The thermal oil furnace system includes a thermal oil storage tank, an electric heater, and a heat exchanger. The electric energy storage system and the thermal oil furnace system are connected via an electric heater power supply, which is used to power the electric heater of the thermal oil furnace system. The thermal oil furnace system utilizes electrical energy storage to supply heat to the thermal load via thermal oil. The electric energy storage system utilizes battery energy storage to supply power to the electrical load via battery discharge. the hybrid energy storage controller is configured to obtain first operating data of the energy supply system, and, when determining based on the first operating data that the energy supply system is operating unstably, control the electric energy storage system to perform charging and discharging operations, so as to regulate the stability of the energy supply system and the normal operation of the first load; The hybrid energy storage controller is connected to an external power distribution system, which includes a second load. The hybrid energy storage controller is further used to obtain second operating data of the external power distribution system. When it is determined based on the second operating data that the external power distribution system is operating unstably, the hybrid energy storage controller controls the electric energy storage system to perform charging and discharging operations, and / or controls the thermal oil furnace system to enter a heat release state to the outside, so as to adjust the stability of the external power distribution system and provide energy for the second load of the external power distribution system.

2. The microgrid electric-thermal hybrid energy storage system according to claim 1, characterized in that: The hybrid energy storage controller is configured to, upon determining that the energy supply system is operating unstably, control the electric energy storage system to enter a peak-shaving state, obtain a first stability demand parameter of the energy supply system and a first load demand parameter of the first load, and control the electric energy storage system to perform charging and discharging operations based on the first stability demand parameter and the first load demand parameter.

3. The microgrid electric-thermal hybrid energy storage system according to claim 1, characterized in that: The hybrid energy storage controller is further configured to, upon determining that the external power distribution system is operating unstably, obtain a second stability requirement parameter of the external power distribution system, a second load requirement parameter of the second load, and a load type of the second load; and based on the second stability requirement parameter, the second load requirement parameter, and the load type, control the electric energy storage system to perform charging and discharging operations, and / or control the thermal oil furnace system to enter a state of external heat release.

4. The microgrid electric-thermal hybrid energy storage system according to any one of claims 1 to 3, characterized in that: The hybrid energy storage controller is configured to determine whether the hybrid energy storage system is in a charging state. If it is determined that the hybrid energy storage system is in the charging state, the controller charges the electric energy storage system and stores heat in the thermal oil boiler system based on the residual energy. If it is determined that the hybrid energy storage system is not in the charging state, the controller controls the operating states of the electric energy storage system and the thermal oil boiler system based on the residual capacity of the hybrid energy storage system.

5. The microgrid electric-thermal hybrid energy storage system according to claim 4, characterized in that: the hybrid energy storage controller being configured to, when it is determined that the hybrid energy storage system is in the charging state and the remaining capacity is less than a first preset capacity, charge the electric energy storage system and store heat in the thermal oil furnace system based on the remaining energy, and, when it is determined that the hybrid energy storage system is in the charging state and the remaining capacity is greater than or equal to the first preset capacity, control the hybrid energy storage system to be in a floating charge state; The hybrid energy storage controller is configured to, when it is determined that the hybrid energy storage system is not in the charging state, determine the relationship between the remaining capacity and a second preset capacity; when it is determined that the remaining capacity is greater than the second preset capacity, control the electric energy storage system to discharge and / or the thermal oil boiler system to release heat; and when it is determined that the remaining capacity is less than or equal to the second preset capacity, control the electric energy storage system and the thermal oil boiler system to stop supplying energy and enter a standby state; The first preset capacity is greater than the second preset capacity.

6. The microgrid electric-thermal hybrid energy storage system according to any one of claims 1 to 3, characterized in that: The hybrid energy storage controller is further configured to control the electric energy storage system and the thermal oil furnace system to be in a charging state or a floating charging state when it is determined that the energy supply system is stable based on the first operating data.

7. The microgrid electric-thermal hybrid energy storage system according to any one of claims 1 to 3, characterized in that: The electric energy storage system includes: at least one battery cluster and at least one energy storage converter, wherein one battery cluster corresponds to one energy storage converter; The battery cluster and the energy storage converter are integrated via an AC bus; Each battery cluster includes at least one group of batteries, and each group of batteries is connected in series to form the battery cluster.

8. The microgrid electric-thermal hybrid energy storage system according to claim 7, characterized in that: The energy storage converter is connected to the hybrid energy storage controller; The hybrid energy storage controller is used to control the charge and discharge of the batteries in the battery cluster by controlling the energy storage converter.

9. A microgrid electric-thermal hybrid energy storage method, characterized in that: Applied to the microgrid electric-thermal hybrid energy storage system according to any one of claims 1 to 8, the method comprises: obtaining first operating data of an energy supply system, and, if it is determined based on the first operating data that the energy supply system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations to adjust the stability of the energy supply system and the normal operation of a first load of the energy supply system; obtaining second operating data of the external power distribution system; and, if it is determined based on the second operating data that the external power distribution system is operating unstably, controlling the electric energy storage system to perform charging and discharging operations, and / or causing the thermal oil furnace system to enter a state of releasing heat to the outside, so as to adjust the stability of the external power distribution system and provide energy for a second load of the external power distribution system.

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