Energy storage system and control method therefor, controller

Abstract

Disclosed in the present disclosure are an energy storage system and a control method therefor, and a controller. The energy storage system comprises a hybrid inverter and a battery system; the hybrid inverter is suitable for being connected to a battery system; and the control method for the energy storage system comprises: acquiring the type of the hybrid inverter (S1); and when parameters of the battery system match the type, controlling the hybrid inverter to work, wherein the parameters are used for representing the output voltage of the battery system (S2).

Description

Energy storage system and control method, controller thereof

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202410523445.1, filed on April 28, 2024, entitled "Energy storage system and control method, controller thereof", and Chinese Patent Application No. 202410523444.7, filed on April 28, 2024, entitled "Control method of hybrid inverter, controller and energy storage system", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of energy storage systems, and in particular to an energy storage system and a control method and controller thereof. BACKGROUND

[0004] In recent years, with the intensification of the European energy crisis and the support of domestic policies, energy storage systems have developed rapidly. At present, the product forms of the energy storage system market are diverse, for example: from the form, they can be divided into all-in-one machines and split machines; from the number of AC output phases, they can be divided into single-phase inverter products and three-phase inverter products; from the voltage range of the energy storage battery, they can be divided into low-voltage battery products and high-voltage battery products.

[0005] Based on the product diversity in the energy storage system, customers need to classify their orders when placing orders, and installation personnel need to manually identify and determine the adaptability during the installation process, resulting in the need for a large amount of manpower, material resources and financial resources in the construction process of the energy storage system.

[0006] DISCLOSURE

[0007] The present disclosure aims to at least partially solve one of the technical problems in the related art. To this end, a first object of the present disclosure is to provide a control method of an energy storage system, which can automatically determine whether a hybrid inverter and a battery system match based on parameters of the battery system and a type of the hybrid inverter after the hybrid inverter is connected to the battery system, and control the hybrid inverter to work in a case where it is determined that the parameters of the battery system match the type, thereby reducing manual participation and reducing application costs.

[0008] A second object of the present disclosure is to provide a controller.

[0009] A third object of the present disclosure is to provide an energy storage system.

[0010] To achieve the above object, the first aspect of the present disclosure provides a control method of an energy storage system, the energy storage system comprising a hybrid inverter and a battery system, the hybrid inverter being adapted to be connected to the battery system, the control method comprising: obtaining a type of the hybrid inverter; and controlling the hybrid inverter to work in a case where a parameter of the battery system matches the type, wherein the parameter is used to represent an output voltage of the battery system.

[0011] According to the control method of the energy storage system, the energy storage system comprises a hybrid inverter and a battery system, the hybrid inverter being adapted to be connected to the battery system, the method obtains a type of the hybrid inverter, and controls the hybrid inverter to work in a case where a parameter of the battery system matches the type, wherein the parameter is used to represent an output voltage of the battery system. Thus, after the hybrid inverter is connected to the battery system, the method can automatically determine whether the battery system and the hybrid inverter match based on the parameter of the battery system and the type of the hybrid inverter, and controls the hybrid inverter to work in a case where the parameter of the battery system matches the type, thereby reducing manual participation and reducing application cost.

[0012] In addition, the control method of the energy storage system according to the above embodiments of the present disclosure can have the following additional technical features:

[0013] According to an embodiment of the present disclosure, the battery system comprises a high-voltage battery system, the high-voltage battery system comprising a plurality of high-voltage battery modules connected in series, and the control method of the energy storage system further comprises: obtaining attribute parameters of the plurality of high-voltage battery modules; and determining whether the parameter of the battery system matches the type based on the attribute parameters, wherein the attribute parameters comprise a number of the plurality of high-voltage battery modules / total output voltage.

[0014] According to an embodiment of the present disclosure, the type comprises single-phase or three-phase, and determining whether the parameter of the battery system matches the type based on the attribute parameters comprises: in a case where the attribute parameters are greater than or equal to a first parameter threshold value and less than a second parameter threshold value, and the type is single-phase, determining that the parameter of the battery system matches the type; in a case where the attribute parameters are greater than or equal to the second parameter threshold value and less than or equal to a third parameter threshold value, determining that the parameter of the battery system matches the type; and in a case where the attribute parameters are greater than the third parameter threshold value and less than or equal to a fourth parameter threshold value, and the type is three-phase, determining that the parameter of the battery system matches the type, wherein the first parameter threshold value < the second parameter threshold value < the third parameter threshold value < the fourth parameter threshold value.

[0015] According to an embodiment of the present disclosure, the plurality of high-voltage battery modules have the same voltage level, and in a case where the attribute parameters comprise the number, the control method of the energy storage system further comprises: obtaining a voltage level of the high-voltage battery modules; and determining the first parameter threshold value, the second parameter threshold value, the third parameter threshold value and the fourth parameter threshold value based on the voltage level and the type.

[0016] According to one embodiment of the present disclosure, the battery system comprises a low-voltage battery system, the low-voltage battery system comprising a low-voltage battery and a first DCDC (Direct Current-Direct Current) module, and the control method of the energy storage system further comprises: sending a type to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameters of the battery system match the type.

[0017] According to one embodiment of the present disclosure, the type comprises single-phase or three-phase, in the case of single-phase, the target voltage is greater than or equal to a first voltage threshold and less than or equal to a third voltage threshold; in the case of three-phase, the target voltage is greater than or equal to a second voltage threshold and less than or equal to a fourth voltage threshold; wherein, in the case that the first DCDC module does not receive the type, the target voltage is greater than or equal to the second voltage threshold and less than or equal to the third voltage threshold; wherein, the first voltage threshold < the second voltage threshold < the third voltage threshold < the fourth voltage threshold.

[0018] According to one embodiment of the present disclosure, the first DCDC module determines its switching frequency and / or gain based on the type, wherein the gain is the ratio of the output voltage to the input voltage of the first DCDC module.

[0019] According to one embodiment of the present disclosure, the hybrid inverter comprises a second DCDC module connected to the DC bus, the second DCDC module is adapted to connect the first DCDC module, and the second DCDC module is further adapted to communicate with the first DCDC module through a hard-wired signal, and the control method of the energy storage system comprises: in the case that the low-voltage battery system meets a preset starting condition, controlling the second DCDC module to start, and sending a fast start instruction to the first DCDC module through the hard-wired signal, so that the first DCDC module starts synchronously with the second DCDC module based on the fast start instruction.

[0020] According to one embodiment of the present disclosure, the hybrid inverter further comprises a DCAC (Direct Current-Alternating Current) module, the DC side of the DCAC module is connected to the DC bus, and the AC side of the DCAC module is adapted to connect the load, wherein the low-voltage battery system meets the preset starting condition by: obtaining a DC bus voltage of the DC bus in the process of controlling the DCAC module to work to supply power to the load; obtaining a voltage difference between the DC bus reference voltage and the DC bus voltage; in the case that the voltage difference is greater than a first preset voltage difference, it is determined that the low-voltage battery system meets the preset starting condition.

[0021] According to one embodiment of the present disclosure, after the first DCDC module and the second DCDC module are synchronously started, the method further comprises: determining a load demand power of the load; obtaining a first power by multiplying the load demand power, a voltage difference value and a preset voltage power conversion coefficient, and obtaining an output power of the second DCDC module by adding the first power and a preset power margin.

[0022] According to one embodiment of the present disclosure, after the first DCDC module and the second DCDC module are synchronously started, the control method further comprises: obtaining an absolute value of a voltage difference between the DC bus reference voltage and the DC bus voltage; in a case where the absolute value of the voltage difference is less than a second preset voltage difference, controlling the second DCDC module and the first DCDC module to maintain a current working state.

[0023] According to one embodiment of the present disclosure, the hybrid inverter further comprises a third DCDC module, one end of the third DCDC module being connected with the DC bus, and the other end of the third DCDC module being adapted to be connected with the new energy power generation device, and the control method further comprises: controlling the third DCDC module to work, so that the new energy power generation device supplies power to the load through the third DCDC module and the DCAC module.

[0024] According to one embodiment of the present disclosure, the battery system comprises a low-voltage battery system or a high-voltage battery system, and the control method further comprises: in response to an access signal of a target battery system, sending an identification information acquisition instruction to the target battery system; wherein the target battery system is a low-voltage battery system or a high-voltage battery system; in response to a response instruction with identification information sent by the target battery system, obtaining the identification information, and obtaining a control program corresponding to the target battery system based on the identification information; and controlling the target battery system based on the control program.

[0025] To achieve the above object, the second embodiment of the present disclosure provides a controller, comprising a memory, a processor and a control program of an energy storage system stored in the memory and executable on the processor, and when the processor executes the control program of the energy storage system, the above-mentioned control method of the energy storage system is realized.

[0026] The controller according to the embodiments of the present disclosure realizes the above-mentioned control method of the energy storage system when the processor executes the control program of the energy storage system, and based on the above-mentioned control method, whether the battery system and the hybrid inverter match can be automatically determined based on the parameters of the battery system and the type of the hybrid inverter, and in a case where it is determined that the parameters and the type of the battery system match, the hybrid inverter is controlled to work, thereby reducing manual participation and reducing application cost.

[0027] To achieve the above object, the third aspect of the present disclosure provides a kind of energy storage system, comprising: battery system;Hybrid inverter, hybrid inverter is suitable for connecting battery system, hybrid inverter further includes controller;Wherein, controller is used to obtain the type of hybrid inverter, and in the case where the parameter of battery system matches type, control hybrid inverter works;Wherein, parameter is used to characterize the output voltage of battery system.

[0028] According to the energy storage system of the embodiment of the present disclosure, the hybrid inverter is suitable for connecting the battery system, and the hybrid inverter further includes a controller. The controller is used to obtain the type of the hybrid inverter and control the hybrid inverter to work in the case where the parameter of the battery system matches the type. The parameter is used to characterize the output voltage of the battery system. Thus, the energy storage system can automatically determine whether the battery system and the hybrid inverter match based on the parameter of the battery system and the type of the hybrid inverter, and control the hybrid inverter to work in the case where the parameter of the battery system matches the type. Therefore, the application cost is reduced by reducing the manual participation.

[0029] In addition, the energy storage system according to the above-mentioned embodiments of the present disclosure can have the following additional technical features:

[0030] According to an embodiment of the present disclosure, the battery system includes a high-voltage battery system, the high-voltage battery system includes a plurality of high-voltage battery modules connected in series, and the hybrid inverter is suitable for connecting the plurality of high-voltage battery modules. The controller is further used to obtain attribute parameters of the plurality of high-voltage battery modules, and determine whether the parameter of the battery system matches the type based on the attribute parameters. The attribute parameters include the number / total output voltage of the plurality of high-voltage battery modules.

[0031] According to an embodiment of the present disclosure, the battery system includes a low-voltage battery system, the low-voltage battery system includes a low-voltage battery and a first DCDC module connected to the low-voltage battery, and the hybrid inverter is suitable for connecting the first DCDC module. The controller is further used to send the type to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameter of the battery system matches the type.

[0032] According to an embodiment of the present disclosure, the battery system includes a low-voltage battery system, the low-voltage battery system includes a low-voltage battery and a first DCDC module connected to the low-voltage battery, and the hybrid inverter further includes a second DCDC module connected to the DC bus. The second DCDC module is further suitable for connecting the first DCDC module, and the second DCDC module is further suitable for communicating with the first DCDC module through a hard-wired signal. The controller is further used to control the second DCDC module to start in the case where the low-voltage battery system satisfies a preset starting condition, and send a fast starting instruction to the first DCDC module through the hard-wired signal, so that the first DCDC module starts synchronously with the second DCDC module based on the fast starting instruction.

[0033] According to one embodiment of the present disclosure, the hybrid inverter further comprises a DCAC module, a direct current side of the DCAC module being connected with the direct current bus, and an alternating current side of the DCAC module being adapted to connect the load, wherein the controller is further configured to: acquire a direct current bus voltage of the direct current bus, and acquire a voltage difference between the direct current bus reference voltage and the direct current bus voltage during the process of controlling the DCAC module to work to supply power to the load, and determine that the low-voltage battery system satisfies the preset starting condition in a case where the voltage difference is greater than a first preset voltage difference.

[0034] According to one embodiment of the present disclosure, the controller is further configured to: after the first DCDC module and the second DCDC module are synchronously started, determine a load demand power of the load, and acquire a first power by multiplying the load demand power, the voltage difference, and a preset voltage-power conversion coefficient, and acquire an output power of the second DCDC module by adding the first power and a preset power margin.

[0035] According to one embodiment of the present disclosure, the controller is further configured to: after the first DCDC module and the second DCDC module are synchronously started, acquire an absolute value of the voltage difference between the direct current bus reference voltage and the direct current bus voltage, and control the second DCDC module and the first DCDC module to maintain a current working state in a case where the absolute value of the voltage difference is less than a second preset voltage difference.

[0036] According to one embodiment of the present disclosure, the hybrid inverter further comprises a third DCDC module, one end of the third DCDC module being connected with the direct current bus, and the other end of the third DCDC module being adapted to connect the new energy power generation device, and the controller is further configured to: control the third DCDC module to work, so that the new energy power generation device supplies power to the load through the third DCDC module and the DCAC module.

[0037] According to one embodiment of the present disclosure, the battery system comprises a low-voltage battery system or a high-voltage battery system, and the controller is further configured to: in response to an access signal of a target battery system, send an identification information acquisition instruction to the target battery system; wherein the target battery system is a low-voltage battery system or a high-voltage battery system; in response to a response instruction with identification information sent by the target battery system, acquire the identification information, and acquire a control program corresponding to the target battery system based on the identification information; and control the target battery system based on the control program.

[0038] According to one embodiment of the present disclosure, the hybrid inverter comprises a plurality of hybrid inverters, and alternating current sides of DCAC modules of the plurality of hybrid inverters are connected in parallel.

[0039] Additional aspects and advantages of the present disclosure will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0041] FIG. 1 is a schematic diagram of an architecture of a storage system in the related art;

[0042] FIG. 2 is a schematic diagram of an architecture of a storage system in the related art;

[0043] FIG. 3 is a schematic diagram of an architecture of a storage system in the related art;

[0044] FIG. 4 is a schematic diagram of a connection of a storage system according to one embodiment of the present disclosure;

[0045] FIG. 5 is a schematic diagram of a connection of a storage system according to one embodiment of the present disclosure when the battery system is a high-voltage battery system;

[0046] FIG. 6 is a schematic diagram of a connection of a storage system according to one embodiment of the present disclosure when the battery system is a low-voltage battery system;

[0047] FIG. 7 is a schematic diagram of an architecture of a storage system according to one specific embodiment of the present disclosure;

[0048] FIG. 8 is a relationship of input voltage levels applicable to different inverters according to one embodiment of the present disclosure;

[0049] FIG. 9 is a flowchart of a control method of a storage system according to one embodiment of the present disclosure;

[0050] FIG. 10 is a schematic diagram of an architecture of a storage system according to one embodiment of the present disclosure when the battery system is a high-voltage battery system;

[0051] FIG. 11 is a schematic diagram of an architecture of a storage system according to one embodiment of the present disclosure when the battery system is a low-voltage battery system;

[0052] FIG. 12 is a circuit diagram of a first DCDC module according to one specific embodiment of the present disclosure;

[0053] FIG. 13 is a schematic diagram of a relationship of output voltage and switching frequency of a first DCDC module according to one specific embodiment of the present disclosure;

[0054] FIG. 14 is a schematic diagram of a connection of a storage system according to one specific embodiment of the present disclosure when the battery system is a low-voltage battery system;

[0055] FIG. 15 is a flowchart of an adaptive matching control method of a storage system according to one specific embodiment of the present disclosure;

[0056] FIG. 16 is a flow chart of a control method according to one embodiment of the present disclosure when the battery system is a high-voltage battery system;

[0057] FIG. 17 is a flow chart of a control method of an energy storage system according to one embodiment of the present disclosure when the battery system is a low-voltage battery system;

[0058] FIG. 18 is a control flow chart of a first DCDC module according to one embodiment of the present disclosure;

[0059] FIG. 19 is a flow chart of a control method during operation of a hybrid inverter according to one embodiment of the present disclosure;

[0060] FIG. 20 is a block diagram of a controller according to one embodiment of the present disclosure;

[0061] FIG. 21 is a connection diagram of an energy storage system according to one embodiment of the present disclosure;

[0062] FIG. 22 is a schematic diagram of an energy storage system architecture according to one embodiment of the present disclosure when the battery system is a low-voltage battery system;

[0063] FIG. 23 is a schematic diagram of an energy storage system architecture according to one embodiment of the present disclosure when the battery system includes a high-voltage battery system;

[0064] FIG. 24 is a schematic diagram of an energy storage system architecture according to one embodiment of the present disclosure when the battery system includes a low-voltage battery system;

[0065] FIG. 25 is a schematic diagram of an energy storage system architecture according to one embodiment of the present disclosure when the battery system includes a high-voltage battery system. DETAILED DESCRIPTION

[0066] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0067] In the historical context of "carbon peak" and "carbon neutral", wind and solar energy as new clean energy will become the absolute main force of energy in the future. However, due to the discontinuous, unstable and uncontrollable characteristics of renewable energy generation such as wind and solar energy, large-scale integration into the power grid will have a serious impact on the safe and stable operation of the power grid. Therefore, energy storage technology as one of the important supporting technologies is an important means to smooth new energy fluctuations and reduce the impact of large-scale new energy access on the power grid.

[0068] In recent years, with the intensification of the European energy crisis and the support of domestic policies, the household light storage system has developed rapidly, and the product forms of the current household light storage market are diverse. From the form, it can be divided into integrated machines and split machines, from the number of AC output phases, it can be divided into single-phase products and three-phase products, and from the voltage range of the energy storage battery, it can be divided into low-voltage battery products and high-voltage battery products. The types are various, each has its own advantages.

[0069] In the product development, sales, maintenance and other whole life cycle processes of the light storage system, all suppliers, customers, installers and other links hope that a product can be compatible with more application scenarios, convenient for storage, management and maintenance. Most system architectures on the market cannot meet the requirements of adapting high-voltage battery systems and low-voltage battery systems to the same inverter, customers need to place orders in categories, and a lot of manpower, material resources and financial resources need to be spent on transportation, storage and management.

[0070] The products on the market at present mainly include the following architectures:

[0071] 1) Architecture 1: Low-voltage battery + DCDC + inverter, as shown in FIG. 1. However, this architecture only supports low-voltage battery systems, cannot use high-voltage battery systems, has high cost, weak competitiveness, and cannot meet the increasingly diversified customer demand;

[0072] 2) Architecture 2: Low-voltage battery + hybrid inverter, as shown in FIG. 2. However, this architecture only supports low-voltage battery systems, cannot use high-voltage battery systems, and at the same time, the two-stage DCDC hybrid inverter is bulky and heavy, cannot meet the demand of one person installing independently, and has high cost;

[0073] 3) Architecture 3: High-voltage battery + hybrid inverter, as shown in FIG. 3. However, this architecture only supports high-voltage battery systems, cannot adapt to low-voltage battery systems.

[0074] The above architecture schemes cannot realize the compatibility of high-voltage battery and low-voltage battery systems (architecture 1, architecture 2, architecture 3), and at the same time, for the energy storage circuit, it is more impossible to adaptively identify single-phase and three-phase inverters.

[0075] Therefore, the present application proposes a system architecture of an energy storage system that can adapt to both high-voltage batteries and low-voltage batteries. The hybrid inverter in the energy storage system can realize the adaptation of a same inverter to low-voltage battery systems or high-voltage battery systems. The energy storage system of the present application will be described in detail below with reference to the accompanying drawings.

[0076] The present application will be described in detail below with reference to the accompanying drawings.

[0077] As shown in FIG. 4, in one embodiment of the present disclosure, the energy storage system 1000 comprises a hybrid inverter 200 and a battery system 100, and the hybrid inverter 200 is adapted to be connected to the battery system 100.

[0078] Specifically, the energy storage system 1000 is a device or system for storing energy, which can store excess energy (such as thermal energy, kinetic energy, electrical energy, potential energy, chemical energy, etc.) and release it when needed. Taking the energy storage system 1000 as a photovoltaic energy storage system as an example, the DC side of the hybrid inverter 200 is connected to the photovoltaic module and the battery system 100, and the AC side of the hybrid inverter 200 is connected to the AC power grid.

[0079] The hybrid inverter 200 can include an energy storage DC / DC module, a PV (Photovoltaic) conversion circuit module, an inverter circuit module, a control sampling module, etc. inside. The hybrid inverter 200 can be a single-phase inverter or a three-phase inverter. The working performance of the single-phase inverter and the three-phase inverter is different, and the corresponding application scenarios are also different. For example, the output current types of the single-phase inverter and the three-phase inverter are different. The single-phase inverter outputs a single-phase current, i.e. a current with only one phase. The three-phase inverter outputs a current with three phases. Through the three-phase current, a more stable and reliable power supply can be provided. The output power of the single-phase inverter and the three-phase inverter is different. The output power of the single-phase inverter is usually small, which is suitable for small power applications. The output power range of the three-phase inverter is extensive, which is suitable for high power applications. The input voltage application ranges of the single-phase inverter and the three-phase inverter are different.

[0080] The battery system 100 can be a high-voltage battery system or a low-voltage battery system. The high-voltage battery system is composed of high-voltage batteries with a voltage greater than 1.5V, and the low-voltage battery system is composed of low-voltage batteries with a voltage less than 1.5V.

[0081] Further, taking the energy storage system 1000 as a photovoltaic energy storage system as an example, the DC side of the hybrid inverter 200 is connected to the photovoltaic module 300 and the battery system 100, and the AC side of the hybrid inverter 200 is connected to the load and the AC power grid (i.e. external power supply), as shown in FIGS. 4-7. The photovoltaic module 300 and the battery system 100 are both connected to the DC bus of the hybrid inverter 200. It can be understood that the battery system 100 can output electrical energy to the load connected to the hybrid inverter 200 for power supply. The AC power grid connected to the hybrid inverter 200, i.e. the external power supply, can also charge the battery system 100. The photovoltaic module 300 can also output electrical energy to the battery system 100 for power supply.

[0082] The hybrid inverter 200 comprises a second DC / DC module 210, a DC / AC module 220 and a third DC / DC module 230, wherein the second DC / DC module 210 can be a two-stage unidirectional module, the DC / AC module 220 is a bidirectional inverter module, and the third DC / DC module 230 can be a PV Boost module. The direct current output by the photovoltaic module 300 is converted by the third DC / DC module 230 and output to the direct current bus.

[0083] When the battery system 100 is a high-voltage battery system, as shown in FIG. 5, the high-voltage battery system comprises a high-voltage battery 110, which is directly connected to the second DC / DC module 210. When the second DC / DC module 210 is in an activated state, the energy in the high-voltage battery 110 can be output to the direct current bus.

[0084] When the battery system 100 is a low-voltage battery system, as shown in FIG. 6, the low-voltage battery system comprises a low-voltage battery 120 and a first DC / DC module 130, wherein the first DC / DC module 130 can be a single-stage isolated DC module. When the hybrid inverter 200 is connected to the low-voltage battery system, the low-voltage battery 120 in the low-voltage battery system is first connected to the first DC / DC module 130, and then the first DC / DC module 130 is connected to the second DC / DC module 210 to complete the connection of the low-voltage battery system and the hybrid inverter 200. When the first DC / DC module 130 and the second DC / DC module 210 are both in an activated state, the energy in the low-voltage battery 120 can be output to the direct current bus, as shown in FIG. 7.

[0085] When the DC / AC module 220 supplies power to a load, the DC / AC module 220 takes power from the direct current bus and converts and outputs it to an external load and / or a power grid.

[0086] Therefore, the hybrid inverter 200 in the energy storage system 1000 can be adapted to high-voltage battery systems and low-voltage battery systems, and the application of the first DC / DC module 130 in the low-voltage battery system has low technical difficulty, a short development cycle and low application cost.

[0087] In addition, for the input port of the hybrid inverter connected to the high-voltage battery system or the low-voltage battery system, the input voltage application range corresponding to different types of inverters is also different. As shown in FIG. 8, the input voltage application range of a single-phase inverter is V1≤V≤V3, the input voltage application range of a three-phase inverter is V2≤V≤V4, and V1

[0088] Since the DC bus voltage of the single-phase inverter is low, and the DC bus voltage of the three-phase inverter is high, the energy storage modules matched with the single three-phase inverter are different in the related art architecture, and need to be developed, produced, stored, transported, sold, maintained, etc. in a classified manner, which greatly increases the application cost. Therefore, the application provides a control method of an energy storage system to realize automatic matching and identification of the battery system and the hybrid inverter, reduces the manual participation, improves the work efficiency, and reduces the application cost.

[0089] The control method of the energy storage system of the application will be described in detail below with reference to the accompanying drawings.

[0090] As shown in FIG. 9, the control method of the energy storage system of the embodiment of the present disclosure can include:

[0091] S1, obtaining the type of the hybrid inverter;

[0092] S2, controlling the hybrid inverter to work in the case that the parameters of the battery system match the type; wherein the parameters are used to represent the output voltage of the battery system.

[0093] Specifically, the type of the hybrid inverter can be determined by identifying the preset single three-phase identification flag. It is assumed that the flag bit of the single-phase inverter is flag_single=1, and the flag bit of the three-phase inverter is flag_three=1.

[0094] The parameters of the battery system matching the type means that the output voltage of the battery system is within the input voltage applicable range corresponding to the type of the hybrid inverter. The parameters of the battery system can be the total output voltage of the battery system, or controllable parameters such as switching frequency, battery module quantity, etc. used to determine the total output voltage of the battery system. In the application process, a preset mapping relationship between the parameters of the battery system and the type of the hybrid inverter can be established in advance, and the table is directly compared after installation to judge whether it is matched; or the parameter range corresponding to the type can be calculated in real time based on the feedback information after installation, so as to judge whether the parameters of the battery system are within the parameter range, so as to judge whether the parameters of the battery system match the type, which is not limited in particular.

[0095] Taking the total output voltage of the battery system as an example, the input voltage applicable range of the single-phase inverter is V1≤V≤V3, the input voltage applicable range of the three-phase inverter is V2≤V≤V4, V1<V2<V3<V4, and specific as shown in FIG. 8, when the total output voltage is in the range of V1-V2, it is determined that the total output voltage of the battery system is in the input voltage applicable range of the single-phase inverter, if it is determined that the type of the hybrid inverter is single-phase, it is considered that the battery system matches the type of the hybrid inverter, and the hybrid inverter is controlled to start working; if it is determined that the type of the hybrid inverter is three-phase, it is considered that the battery system does not match the type of the hybrid inverter, and the hybrid inverter is controlled not to work, and a prompt signal can be sent.

[0096] The embodiment can automatically determine whether the battery system and the hybrid inverter match based on the parameters of the battery system and the type of the hybrid inverter after the hybrid inverter is connected to the battery system, and control the hybrid inverter to work in the case that it is determined that the parameters of the battery system match the type, thereby reducing manual participation and reducing application cost.

[0097] In an embodiment of the present disclosure, the battery system includes a high-voltage battery system, the high-voltage battery system includes a plurality of high-voltage battery modules connected in series, and the control method of the energy storage system further includes: obtaining attribute parameters of the plurality of high-voltage battery modules; determining whether the parameters of the battery system match the type of the hybrid inverter based on the attribute parameters; wherein the attribute parameters include the number of the plurality of high-voltage battery modules / total output voltage.

[0098] As shown in FIG. 10, the high-voltage battery system and the hybrid inverter have a power interface POWER and a communication interface COM, and the high-voltage battery system and the hybrid inverter realize power transmission and communication process through the power interface POWER and the communication interface COM.

[0099] Specifically, for the high-voltage battery system, different levels of voltage output can be realized by selecting different numbers of high-voltage battery module cascades, and thus the attribute parameters of the plurality of high-voltage battery modules can be the number of the plurality of high-voltage battery modules in the high-voltage battery system, the total output voltage of the high-voltage battery system is represented by the number of the plurality of high-voltage battery modules, or the total output voltage of the plurality of high-voltage battery modules in the high-voltage battery system is directly taken as the attribute parameter, so as to determine whether the total output voltage of the high-voltage battery system matches the input voltage applicable range corresponding to the type of the hybrid inverter, and if so, the hybrid inverter is controlled to work.

[0100] In the high-voltage battery system, if the voltage level of each high-voltage battery module is a, then a single-phase inverter can select to configure m1-m3 modules, and a three-phase inverter can select to configure m2-m4 modules, where m1

[0101] Taking the number of multiple high-voltage battery modules as an attribute parameter, if the number of multiple high-voltage battery modules is in [m1, m2), then if the type of the hybrid inverter is single-phase, it is considered that the parameters of the battery system match the type of the hybrid inverter, and the hybrid inverter is controlled to work; if the type of the hybrid inverter is three-phase, it is considered that the parameters of the battery system do not match the type of the hybrid inverter, and the hybrid inverter is controlled not to work and a reminder is issued.

[0102] In an embodiment of the present disclosure, the type of the hybrid inverter includes single-phase or three-phase, and based on the attribute parameter, it is determined whether the parameters of the battery system match the type, including: in the case that the attribute parameter is greater than or equal to a first parameter threshold and less than a second parameter threshold, and the type is single-phase, it is determined that the parameters of the battery system match the type; in the case that the attribute parameter is greater than or equal to the second parameter threshold and less than or equal to a third parameter threshold, it is determined that the parameters of the battery system match the type; in the case that the attribute parameter is greater than the third parameter threshold and less than or equal to a fourth parameter threshold, and the type is three-phase, it is determined that the parameters of the battery system match the type; where the first parameter threshold

[0103] Specifically, taking the number of multiple high-voltage battery modules as an attribute parameter, then the first parameter threshold is m1, the second parameter threshold is m2, the third parameter threshold is m3, and the fourth parameter threshold is m4, where m1

[0104] In combination with FIG. 10, it is assumed that the high-voltage battery system includes n high-voltage battery modules, which are represented as high-voltage battery module 1, high-voltage battery module 2, …, and high-voltage battery module n. If m1≤n

[0105] In one embodiment of the present disclosure, the voltage levels of the plurality of high-voltage battery modules are the same, and in the case that the attribute parameter includes the number, the control method of the energy storage system further includes: obtaining the voltage level of the high-voltage battery module; determining the first parameter threshold, the second parameter threshold, the third parameter threshold, and the fourth parameter threshold based on the voltage level and the type.

[0106] For example, when the voltage level of the high-voltage battery module is a, and the type of the hybrid inverter is single-phase, then based on the input voltage applicable range corresponding to the single-phase inverter and the voltage level, the configurable module number corresponding to the single-phase inverter can be determined to be m1-m3, so as to determine that the first parameter threshold is m1 and the third parameter threshold is m3; when the type of the hybrid inverter is three-phase, then based on the input voltage applicable range corresponding to the three-phase inverter and the voltage level, the configurable module number corresponding to the three-phase inverter can be determined to be m2-m4, so as to determine that the second parameter threshold is m2 and the fourth parameter threshold is m4.

[0107] In one embodiment of the present disclosure, in combination with FIG. 11, the battery system includes a low-voltage battery system, and the low-voltage battery system includes a low-voltage battery 120 and a first DCDC module 130. The control method of the energy storage system further includes: sending the type to the first DCDC module 130, so that the first DCDC module 130 outputs a target voltage based on the type, so that the parameters of the battery system match the type.

[0108] Specifically, as shown in FIG. 11, the low-voltage battery 120 in the low-voltage battery system is first connected to the first DCDC module 130, and then the first DCDC module 130 is connected to the hybrid inverter to complete the connection of the low-voltage battery system and the hybrid inverter. When the first DCDC module 130 is in a starting state, the energy in the low-voltage battery 120 can be output to the hybrid inverter. The low-voltage battery system and the hybrid inverter have a power interface POWER, a communication interface COM, a hardware signal interface, etc., that is, the hybrid inverter is connected to the first DCDC module 130 through the power interface POWER, the communication interface COM, and the hardware signal interface. In addition to the communication interface COM, the second DCDC module 120 can also communicate with the first DCDC module 130 through the hardware signal interface based on the hardware signal interface, and the communication can be divided according to the situation.

[0109] Therefore, after the first DCDC module of the low-voltage battery system is connected to the hybrid inverter, the output of the first DCDC module is the input of the hybrid inverter. After the low-voltage battery system is connected to the hybrid inverter, the hybrid inverter sends the type of the hybrid inverter to the first DCDC module of the low-voltage battery system through the communication interface COM, such as sending an instruction with a single-three-phase identification flag to the first DCDC module.

[0110] The first DCDC module identifies the received instruction to determine the type of the hybrid inverter, determines the target voltage according to the input voltage applicable range corresponding to the type of the hybrid inverter, and controls the low-voltage battery system to output the target voltage within the input voltage applicable range, so that the parameters of the low-voltage battery system match the type.

[0111] The embodiment adjusts the output voltage of the first DCDC module by identifying the type of the hybrid inverter, so that the output voltage is adjusted to be within the input voltage applicable range of the hybrid inverter, so as to achieve the optimal use condition of the hybrid inverter. The first DCDC module can be an LLC (Resonant Converters), a DAB (Dual Active Bridge Converter), a BUCK, a BOOST, or the like, and the output voltage of the first DCDC module is adjusted by identifying the type of the inverter to match the optimal use condition of the inverter.

[0112] In one embodiment of the present disclosure, the type of the hybrid inverter includes single-phase or three-phase. In the case of single-phase, the target voltage is greater than or equal to a first voltage threshold V1 and less than or equal to a third voltage threshold V3. In the case of three-phase, the target voltage is greater than or equal to a second voltage threshold V2 and less than or equal to a fourth voltage threshold V4. In the case where the first DCDC module does not receive the type, the target voltage is greater than or equal to the second voltage threshold V2 and less than or equal to the third voltage threshold V3. The first voltage threshold V1 < the second voltage threshold V2 < the third voltage threshold V3 < the fourth voltage threshold V4.

[0113] Specifically, when the type of the hybrid inverter is determined to be single-phase, the target voltage is set to be within the input voltage applicable range of the single-phase inverter, i.e., V1≤V≤V3. When the type of the hybrid inverter is determined to be three-phase, the target voltage is set to be within the input voltage applicable range of the three-phase inverter, i.e., m2≤n≤m4. However, when the first DCDC module does not receive the type, for example, the instruction is not successfully identified, the target voltage is set to be within the intersection of the input voltage applicable ranges of the single-phase inverter and the three-phase inverter, i.e., m2≤n≤m3. At this time, no matter whether the type of the hybrid inverter is single-phase or three-phase, the target voltage output by the first DCDC module meets the input voltage requirement of the hybrid inverter.

[0114] In one embodiment of the present disclosure, the first DCDC module determines its switching frequency and / or gain based on the type, wherein the gain is the ratio of the output voltage to the input voltage of the first DCDC module.

[0115] Specifically, taking the circuit diagram of the first DCDC module as an example in FIG. 12, the LLC topology as the main circuit of the first DCDC module can realize the adjustment of the output voltage of the first DCDC module by adjusting the switching frequency of the circuit. The input-output relationship formula is: V0=n*Gain*Vin

[0116] Wherein, V0 represents the output voltage of the first DCDC module, n represents the turns ratio of the LLC transformer, Gain represents the gain (i.e. amplification factor) of the LLC circuit, and Vin is the input voltage of the first DCDC module, i.e. the output voltage of the low-voltage battery. In addition, Gain is a function of the switching frequency f, and the relationship curve is shown in FIG. 13. In FIG. 13, the switching frequencies f1>f2>f3>f4, and the corresponding output voltage gains are G1, G2, G3 and G4, and the output voltages of the first DCDC module are V1, V2, V3 and V4, respectively. Thus, by the above-mentioned voltage regulation mode, the switching frequency can be adjusted according to the input voltage application range of the single-phase inverter and the three-phase inverter to match the type of the hybrid inverter.

[0117] Further, since the hybrid inverter can be a single-phase inverter or a three-phase inverter, after the hybrid inverter is connected to the battery system, self-adaptive recognition and matching need to be performed at the installation site.

[0118] Specifically, after the battery system and the hybrid inverter are installed, the staff presses the control button corresponding to the battery system to send the access signal of the battery system to the hybrid inverter, wherein the access signal is a signal with level conversion.

[0119] When the hybrid inverter detects that the port electrical signal level changes, it is determined that the access signal of the battery system is received, so as to perform the above-mentioned motor control method.

[0120] Further, the hybrid inverter can also judge whether the access signal is received based on the pressing duration of the control button. For example, when the control button is pressed, the port electrical signal level becomes high; when the control button is released, the port electrical signal level returns to low. The hybrid inverter starts timing when the port electrical signal level becomes high, and ends timing when the port electrical signal level returns to low. If the timing time reaches the set time, it is determined that the button signal is valid, and the access signal of the battery system is received; otherwise, it is considered that the button signal is invalid, and the access signal of the battery system is not received, and a feedback signal is sent to the after-sales APP to prompt the installer to perform the button operation again.

[0121] It should be noted that in addition to the above, the battery system access signal is sent to the hybrid inverter through the hardware control button. It can also be sent to the hybrid inverter through the mobile phone APP based on the communication network. For example, in the case of normal communication connection, the staff sends a response control signal to the hybrid inverter through the network based on the mobile phone APP to control the entire power storage system to start, stop and other functions. However, when the network facility is disconnected due to force majeure factors (such as war, weather, geological disasters, etc.), the staff can manually control through the control button to provide reliable emergency response.

[0122] As shown in FIG. 14, in one embodiment of the present disclosure, the hybrid inverter 200 includes a second DCDC module 210 connected to the DC bus, the second DCDC module 210 is adapted to connect the first DCDC module 130, and the second DCDC module 210 is also adapted to communicate with the first DCDC module 130 through a hard-wired signal.

[0123] Specifically, taking the photovoltaic energy storage system as an example, the DC side of the hybrid inverter 200 is connected to the photovoltaic assembly and the battery system, and the AC side of the hybrid inverter 200 is connected to the load and the AC power grid, wherein the photovoltaic assembly and the battery system are connected to the DC bus of the hybrid inverter 200.

[0124] The hybrid inverter 200 can be connected to a high-voltage battery system or a low-voltage battery system and has a second DCDC module 210, a control sampling module, etc. When the hybrid inverter 200 is connected to a low-voltage battery system, as shown in FIG. 14, the low-voltage battery 120 in the low-voltage battery system is first connected to the first DCDC module 130, and then the first DCDC module 130 is connected to the second DCDC module 210 to complete the connection between the low-voltage battery system and the hybrid inverter 200. When the first DCDC module 130 and the second DCDC module 210 are both in the starting state, the energy in the low-voltage battery 120 can be output to the DC bus. The low-voltage battery system and the hybrid inverter 200 have a power interface, a communication interface, a hardware signal interface, etc., that is, the second DCDC module 210 can be connected to the first DCDC module 130 through the power interface, the communication interface, the hardware signal interface, etc. In addition to the communication interface, the second DCDC module 210 can also communicate quickly through the hardware signal interface based on the hardware signal interface. The communication can be divided according to the situation.

[0125] It can be understood that the hybrid inverter 200 can be adapted to a high-voltage battery system and a low-voltage battery system, and FIG. 14 is only a schematic diagram of the connection of the hybrid inverter 200 and the low-voltage battery system. In addition, the application technology of the first DCDC module 130 in the low-voltage battery system is low in difficulty, short in development cycle, and low in application cost.

[0126] In one embodiment of the present disclosure, the control method of the energy storage system comprises: in the case that the low-voltage battery system satisfies a preset starting condition, controlling the second DCDC module to start, and sending a fast starting instruction to the first DCDC module through a hard-wired signal, so as to make the first DCDC module start synchronously with the second DCDC module based on the fast starting instruction.

[0127] Specifically, in the process of controlling the hybrid inverter to work, if the output energy of the photovoltaic module is sufficient to support the output energy demand of the hybrid inverter, the second DCDC module and the first DCDC module are controlled to enter a standby state, so as to save the consumption of low-voltage battery energy.

[0128] When the output energy of the photovoltaic module cannot support the output energy demand of the hybrid inverter at a certain moment, for example, when the AC side of the energy storage inverter suddenly accesses a large load, and the total load after access is greater than the total power generation of the photovoltaic module, the low-voltage battery system needs to supplement the energy of the DC bus of the hybrid inverter to prevent the entire system from collapsing, at this time, it is determined that the low-voltage battery system satisfies the preset starting condition, the controller of the hybrid inverter controls the second DCDC module to start, and sends a fast starting instruction to the first DCDC module based on the hardware signal through a hardware signal interface, so as to make the first DCDC module start synchronously with the second DCDC module based on the fast starting instruction, thereby realizing the fast starting output energy of the first DCDC module and the second DCDC module based on the starting of the low-voltage battery, supplementing the energy of the DC bus of the hybrid inverter, and preventing the entire system from collapsing. At this time, the photovoltaic module and the low-voltage battery supply power at the same time.

[0129] The hardware signal interface is an IO interface, and the hardware signal is a high-level signal and a low-level signal, for example, when the hardware signal is a high-level signal, it is a fast starting instruction; when the hardware signal is a low-level signal, it is a standby instruction, so that the first DCDC module performs fast starting when receiving the high-level signal, and stops working when receiving the low-level signal.

[0130] It is further pointed out that the DCDC module in the present application can be an LLC, DAB, BUCK, BOOST, etc. The hardware signal can be in the form of a dry contact, a signal conversion of a level size, a level inversion, a button, etc., and the specific form is not limited.

[0131] Thus, the embodiment can realize the synchronous starting of the first DCDC module and the second DCDC module based on the hardware signal, meet the requirement of quickly supporting the DC bus energy, avoid the system collapse caused by the slow energy supplement speed, improve the operation stability of the system, and enable the system to have the large load dynamic cut-in function.

[0132] In one embodiment of the present disclosure, the hybrid inverter further comprises a DCAC module, a DC side of the DCAC module being connected with the DC bus, and an AC side of the DCAC module being adapted to connect with the load. The low-voltage battery system is determined to meet the preset starting condition in the following manner: in the process of controlling the DCAC module to work to supply power to the load, the DC bus voltage V1 of the DC bus is obtained; the voltage difference AVDC between the DC bus reference voltage Vref and the DC bus voltage V1 is obtained; and in the case that the voltage difference AVDC is greater than a first preset voltage difference c, the low-voltage battery system is determined to meet the preset starting condition.

[0133] Specifically, taking the photovoltaic energy storage system shown in FIG. 6 as an example, the new energy power generation device 300 is a photovoltaic module, and the new energy power generation device 300 and the low-voltage battery system are both connected to the DC bus of the hybrid inverter 200. In the case that the DCAC module 220 supplies power to the load, the DCAC module 220 directly takes DC power from the DC bus, converts the DC power into AC power, and outputs the AC power to supply power to the load. The DC bus is an energy collection channel of the new energy power generation device 300 and the low-voltage battery system.

[0134] In the process of controlling the DCAC module 220 to work as a load power supply, if the output energy of the new energy power generation device 300 is sufficient to support the output energy demand of the hybrid inverter 200, i.e., the load demand, the second DCDC module 210 and the first DCDC module 130 are controlled to enter a standby state, at this time, the voltage of the DC bus is the output voltage of the new energy power generation device 300. At the same time, the DC bus voltage V1 of the DC bus is detected, and the voltage difference AVDC between the obtained DC bus reference voltage Vref and the DC bus voltage V1 is obtained. If it is determined that the voltage difference AVDC is greater than a first preset voltage difference c, it is considered that the output energy of the new energy power generation device 300 cannot support the output energy demand of the hybrid inverter 200, and it is determined that the low-voltage battery system satisfies the preset starting condition, the second DCDC module 210 is controlled to start, and at the same time, a fast starting instruction is sent to the first DCDC module 130 based on the hardware signal through the hardware signal interface, so that the first DCDC module 130 starts synchronously with the second DCDC module 210 based on the fast starting instruction, and the low-voltage battery 120 supplies energy to the DC bus. If it is determined that the voltage difference AVDC is less than or equal to the first preset voltage difference c, it is considered that the output energy of the new energy power generation device 300 can support the output energy demand of the hybrid inverter 200, and the second DCDC module and the first DCDC module continue to be controlled to remain in the standby state.

[0135] Therefore, the embodiment determines whether the preset starting condition is reached based on voltage comparison, without the long process of calculating and comparing power through software, and further improves the starting response speed.

[0136] In an embodiment of the present disclosure, after the first DCDC module and the second DCDC module start synchronously, the method further comprises: determining the load demand power Pac of the load; obtaining a first power by multiplying the load demand power Pac, the voltage difference AVDC and a preset voltage power conversion coefficient k, and obtaining an output power Pbat of the second DCDC module by adding a preset power margin x to the first power.

[0137] Specifically, after the first DCDC module and the second DCDC module start synchronously, the output power of the low-voltage battery system, i.e., the output power Pbat of the second DCDC module, is determined by the following formula:

[0138] Wherein, Pbat represents the output power of the second DCDC module, k represents the preset voltage power conversion coefficient, AVDC represents the voltage difference, Pac represents the load demand power, and x represents the preset power margin. The preset power margin x can be set according to actual conditions, and can be 0.

[0139] After the output power Pbat of the second DCDC module is determined according to the above formula, the first DCDC module and the second DCDC module are controlled based on the output power Pbat to meet the power supply demand.

[0140] In an embodiment of the present disclosure, after the first DCDC module and the second DCDC module are started synchronously, the control method further comprises: obtaining an absolute value |△VDC| of a voltage difference between the DC bus reference voltage Vref and the DC bus voltage V1; in a case where the absolute value |△VDC| of the voltage difference is less than a second preset voltage difference d, the second DCDC module and the first DCDC module are controlled to maintain a current working state.

[0141] That is, in a case where |△VDC| = |Vref-V1| < d, it is determined that the output power of the DCAC module 220 can meet the load demand power Pac of the current load, and the second DCDC module and the first DCDC module are controlled to maintain the current working state to continue to supply power to the load.

[0142] In an embodiment of the present disclosure, the hybrid inverter further comprises a third DCDC module, one end of the third DCDC module being connected to the DC bus, and the other end of the third DCDC module being adapted to be connected to a new energy power generation device, and the control method further comprises: controlling the third DCDC module to work so that the new energy power generation device supplies power to the load through the third DCDC module and the DCAC module.

[0143] Specifically, in a photovoltaic energy storage system, the new energy power generation device is a photovoltaic module; and in a wind power energy storage system, the new energy power generation device is a wind power generation device.

[0144] Taking the photovoltaic energy storage system shown in FIG. 6 as an example, the new energy power generation device 300 is a photovoltaic module, and the new energy power generation device 300 is connected to the DC bus through the third DCDC module 230. During power supply to the load, the third DCDC module 230 and the DCAC module 220 are controlled to work simultaneously, the DC power output by the new energy power generation device 300 is converted into target DC power by the third DCDC module 230 and output to the DC bus, and the DCAC module 220 takes power from the DC bus and converts it into AC power to supply power to the load.

[0145] In one embodiment of the present disclosure, the battery system includes a low-voltage battery system or a high-voltage battery system. The control method further includes: in response to an access signal of the target battery system, sending an identification information acquisition instruction to the target battery system; wherein the target battery system is a low-voltage battery system or a high-voltage battery system; in response to a response instruction with identification information sent by the target battery system, acquiring the identification information, and based on the identification information, acquiring a control program corresponding to the target battery system; and based on the control program, controlling the target battery system. Wherein the target battery system is a high-voltage battery system or a low-voltage battery system. That is, the hybrid inverter can adapt to high-voltage battery systems and low-voltage battery systems. If a high-voltage battery system is used, as shown in FIG. 5, the second DCDC module 210 is directly connected to the high-voltage battery 110, that is, the high-voltage battery 110 can be directly connected to the hybrid inverter 200, wherein the high-voltage battery system and the hybrid inverter 200 can be connected through a power interface and a communication interface. In the case of a battery system including a low-voltage battery system, the specific connection is shown in FIG. 6, which is not described here.

[0146] Since the hybrid inverter can access a high-voltage battery system and a low-voltage battery system, after the hybrid inverter is connected to the battery system, self-adaptive identification and matching need to be performed at the installation site.

[0147] Specifically, after the target battery system and the hybrid inverter are installed, the worker presses the control button corresponding to the target battery system to send an access signal of the target battery system to the hybrid inverter, wherein the access signal is a signal with level conversion.

[0148] When the hybrid inverter detects that the port electrical signal level receiving the access signal changes, it is determined that the access signal of the target battery system is received, and an identification information acquisition instruction is sent to the first DCDC module of the high-voltage battery or low-voltage battery system through the communication interface, requesting it to return a response instruction with identification information of the high-voltage battery system or low-voltage battery system.

[0149] After the hybrid inverter acquires the identification information according to the response instruction, it determines the control program matched with the target battery system and performs initialization operation based on the control program to control the target battery system. For example, the flag information of the high-voltage battery system is 1, and the flag information of the low-voltage battery system is 0. When the hybrid inverter determines that the flag information is 1, the initialization operation is performed with the control program corresponding to the high-voltage battery system, and is used for subsequent system control; when the hybrid inverter determines that the flag information is 0, the initialization operation is performed with the control program corresponding to the low-voltage battery system, and is used for subsequent system control.

[0150] Further, the hybrid inverter can also determine whether the access signal is received based on the pressing duration of the control button. For example, when the control button is pressed, the port electrical signal level becomes high; when the control button is released, the port level signal level returns to low. The hybrid inverter starts timing when the port electrical signal level becomes high, and ends timing when it returns to low. If the timing time reaches the set time, it is determined that the button signal is valid, and the access signal of the target battery system is received; otherwise, it is considered that the button signal is invalid, and the access signal of the target battery system is not received, and a feedback signal is sent to the after-sales APP, prompting the installer to perform the button operation again.

[0151] It should be noted that in addition to the above, the access signal of the target battery system is sent to the hybrid inverter through the hardware control button. The access signal of the target battery system can also be sent to the hybrid inverter through the mobile phone APP based on the communication network. For example, under normal communication connection, the staff sends a response control signal to the hybrid inverter through the network based on the mobile phone APP to control the entire power supply and energy storage system to start, stop and other functions. However, when the network facility is disconnected due to force majeure factors (such as war, weather, geological disasters, etc.), the staff can manually control through the control button to provide reliable emergency response.

[0152] As a specific embodiment of the present disclosure, taking the energy storage system as a photovoltaic energy storage system as an example, after the connection of the battery system and the hybrid inverter is completed, the control program corresponding to the type of the battery system is first determined, and the adaptive matching control process is performed, as shown in FIG. 15, which can include the following steps:

[0153] S101, the photovoltaic energy storage system is installed;

[0154] S102, the photovoltaic module connection switch is turned on, and the hybrid inverter is powered on standby;

[0155] S103, the control button of the high-voltage battery is pressed / the control button of the first DCDC module is pressed;

[0156] S104, the hybrid inverter identifies the control button signal, determines that the access signal is received, and sends an identification information acquisition instruction to the target battery system in response to receiving the access signal;

[0157] S105, receiving the response instruction with identification information sent by the target battery system, and acquiring the identification information based on the response instruction;

[0158] S106, acquiring the control program corresponding to the target battery system based on the identification information, and initializing;

[0159] S107, the photovoltaic energy storage system starts running, and the target battery system is controlled based on the control program.

[0160] When the battery system is a high-voltage battery system, the attribute parameters of the plurality of high-voltage battery modules are the number n of high-voltage battery modules, and the first parameter threshold, the second parameter threshold, the third parameter threshold, and the fourth parameter threshold are n1, n2, n3, and n4, respectively. After the adaptive matching is completed, the control method of the energy storage system is executed by the control program corresponding to the high-voltage battery system, and the specific process is shown in FIG. 16, which can include the following steps:

[0161] S201, the photovoltaic energy storage system is installed;

[0162] S202, the photovoltaic connection switch is turned on, and the hybrid inverter is powered on standby;

[0163] S203, the hybrid inverter sends a communication request instruction to the high-voltage battery;

[0164] After the high-voltage battery system is connected to the hybrid inverter, the installer presses the corresponding control button to activate and identify the number n of battery modules. After receiving the button signal, the hybrid inverter starts to execute S203.

[0165] The high-voltage battery receives the communication request instruction and returns a response command to report the number n of battery modules;

[0166] S204, the energy storage inverter acquires the number n of battery modules;

[0167] S205, determine whether the number n is greater than or equal to m1. If yes, execute step S206; if no, execute step S207.

[0168] S206, determine whether n is less than m2. If yes, execute step S208; if no, execute step S210.

[0169] S207, determine that the parameters and types of the battery system do not match.

[0170] S208, determine whether the type of the hybrid inverter is single-phase. If yes, execute step S209; if no, execute step S207.

[0171] S209, determine that the parameters and types of the battery system match, and control the hybrid inverter to work.

[0172] S210, determine whether n is less than or equal to m3. If yes, execute step S209; if no, execute step S211.

[0173] S211, determine whether n is less than or equal to m4. If yes, execute step S212; if no, execute step S207.

[0174] S212, determine whether the type of the hybrid inverter is three-phase. If yes, execute step S209; if no, execute step S207.

[0175] When the battery system is a low-voltage battery system, after the adaptive matching is completed, the control method of the energy storage system is executed by the control program corresponding to the low-voltage battery system, and the control method can include the following steps, as shown in FIG. 17.

[0176] S301, the energy storage system is installed;

[0177] S302, the photovoltaic connection switch is closed, and the hybrid inverter is powered on standby;

[0178] S303, the hybrid inverter sends a communication request instruction to the first DCDC module;

[0179] Wherein, after the low-voltage battery system is connected with the hybrid inverter, the installer presses the button of the first DCDC module, and the hybrid inverter starts to execute S303 after receiving the button signal.

[0180] S304, the hybrid inverter sends an instruction with a single three-phase identification flag to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameters of the battery system are matched with the type.

[0181] Wherein, the first DCDC module outputs a target voltage based on the type can include the following steps, as shown in FIG. 18.

[0182] S401, the first DCDC module receives the instruction and identifies the type;

[0183] S402, determine whether the type is successfully identified. If yes, execute step S403 when the type is single-phase, and execute step S406 when the type is three-phase; if no, execute step S407.

[0184] S403, determine that the input voltage range of the single-phase inverter is V1≤V≤V3;

[0185] S404, limit the switching frequency of the first DCDC module within f3≤f≤f1; execute step S409;

[0186] S405, determine that the input voltage range of the three-phase inverter is V2≤V≤V4;

[0187] S406, limit the switching frequency of the first DCDC module within f4≤f≤f2; execute step S409;

[0188] S407, determine that the input voltage range of the single-phase inverter and the three-phase inverter is V2≤V≤V3;

[0189] S408, limit the switching frequency of the first DCDC module within f3≤f≤f2; and perform step S409;

[0190] S409, the first DCDC module outputs a target voltage to match the parameters and types of the battery system.

[0191] Therefore, when the battery system is a high-voltage battery system, the embodiment can automatically determine whether the number of high-voltage battery modules is suitable for the type of hybrid inverter, without the need to classify batteries at the research and development, production, sales, and storage stages; when the battery system is a low-voltage battery system, the first DCDC module can work by adjusting the frequency, adaptively identify the ideal working interval of the single-phase inverter and the three-phase inverter, or control the output voltage within the voltage range allowed by the single-phase inverter and the three-phase inverter, so that the same set of low-voltage battery system can be adapted to the single-phase inverter and the three-phase inverter, the product is normalized, the production process is greatly simplified, the production efficiency is improved, the inventory materials are simplified, and the customer management and maintenance are facilitated.

[0192] In the case of a target battery system being a low-voltage battery system, in the process of determining that the parameters of the low-voltage battery system match the hybrid inverter and controlling the hybrid inverter to work, the control method of the energy storage system is shown in FIG. 19, which can include the following steps:

[0193] S501, control the first DCDC module and the second DCDC module to standby, and control the third DCDC module and the DCAC module to work to provide power to the load by the energy provided by the photovoltaic assembly;

[0194] S502, obtain the bus DC voltage V1;

[0195] S503, obtain the voltage difference AVDC between the DC bus reference voltage and the DC bus voltage, AVDC=Vref-V1;

[0196] S504, determine whether the voltage difference AVDC is greater than a first preset voltage difference c. If yes, perform step S505; if no, perform step S502;

[0197] S505, control the second DCDC module to start, and send a fast start instruction to the first DCDC module through a hard-wired signal, so that the first DCDC module and the second DCDC module are started synchronously, and the load is powered by the photovoltaic assembly and the low-voltage battery at the same time;

[0198] S506, determine the load demand power Pac of the load;

[0199] S507, calculate the battery end required to supplement power Pbat=k*△VDC*Pac+x;

[0200] S508, control the first DCDC module and the second DCDC module based on the power Pbat;

[0201] S509, obtain the absolute value of the voltage difference between the DC bus reference voltage and the DC bus voltage |△VDC|=|Vref-V1|;

[0202] S510, determine whether the absolute value of the voltage difference |△VDC| is less than the second preset voltage difference d. If yes, execute step S511; if no, execute step S506.

[0203] S511, keep the current working state of the first DCDC module and the second DCDC module stable.

[0204] In summary, according to the control method of the energy storage system of the embodiment of the present disclosure, the energy storage system comprises a hybrid inverter and a battery system, the hybrid inverter is adapted to be connected to the battery system, the method obtains the type of the hybrid inverter, and controls the hybrid inverter to work in the case that the parameters of the battery system match the type; wherein the parameters are used to represent the output voltage of the battery system. Therefore, after the hybrid inverter is connected to the battery system, the method can automatically determine whether the battery system and the hybrid inverter match based on the parameters of the battery system and the type of the hybrid inverter, and controls the hybrid inverter to work in the case that the parameters of the battery system match the type, thereby reducing the manual participation and reducing the application cost.

[0205] Corresponding to the above-mentioned embodiment, the present disclosure further proposes a controller.

[0206] As shown in FIG. 20, the controller 400 of the embodiment of the present disclosure comprises a memory 410, a processor 420, and a control program of an energy storage system stored in the memory 410 and executable on the processor 420, and the processor 420 implements the above-mentioned control method of the energy storage system when executing the control program of the energy storage system.

[0207] According to the controller of the embodiment of the present disclosure, the processor implements the above-mentioned control method of the energy storage system when executing the control program of the energy storage system, and based on the above-mentioned control method, the battery system and the hybrid inverter can be automatically determined to match based on the parameters of the battery system and the type of the hybrid inverter, and the hybrid inverter is controlled to work in the case that the parameters of the battery system match the type, thereby reducing the manual participation and reducing the application cost.

[0208] Corresponding to the above-mentioned embodiment, the present disclosure further proposes an energy storage system.

[0209] As shown in FIG. 21, the energy storage system 1000 of the embodiment of the present disclosure comprises: a battery system 100; a hybrid inverter 200 adapted to be connected to the battery system 100, the hybrid inverter 200 further comprising a controller 400; wherein the controller 400 is configured to acquire a type of the hybrid inverter 200, and control the hybrid inverter 200 to work in a case that a parameter of the battery system 100 matches the type; wherein the parameter is used to represent an output voltage of the battery system 100.

[0210] The energy storage system 1000 can comprise a plurality of hybrid inverters 200, as shown in FIGS. 10 and 11, represented as hybrid inverter #1, hybrid inverter #2, hybrid inverter #3, …, hybrid inverter #n, respectively, wherein the plurality of hybrid inverters 200 are connected in parallel to realize the function of parallel expansion of the hybrid inverters 200, realize the expansion of grid-connected power, and meet different load requirements. It should be noted that the connection lines in the figure are simplified, and COM is a communication signal.

[0211] In an embodiment of the present disclosure, the battery system 100 comprises a high-voltage battery system comprising a plurality of high-voltage battery modules connected in series, and the hybrid inverter 200 is adapted to be connected to the plurality of high-voltage battery modules; the controller 400 is further configured to acquire attribute parameters of the plurality of high-voltage battery modules, and determine whether the parameter of the battery system 100 matches the type based on the attribute parameters; wherein the attribute parameters comprise the number / total output voltage of the plurality of high-voltage battery modules.

[0212] In an embodiment of the present disclosure, the battery system 100 is a low-voltage battery system comprising a low-voltage battery and a first DCDC module connected to the low-voltage battery, and the hybrid inverter 200 is adapted to be connected to the first DCDC module; the controller 400 is further configured to send the type to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameter of the battery system matches the type.

[0213] Therefore, the energy storage system 1000 of the embodiment has the following specific advantages:

[0214] 1. The same high-voltage battery system or the same low-voltage battery system can realize compatible adaptation to single-phase inverters and three-phase inverters, and can realize self-adaptive matching of single-phase and three-phase systems during installation;

[0215] 2. The number of product codes is reduced, and the production, storage, transportation, installation, and maintenance costs are greatly reduced;

[0216] 3. The high-voltage battery is modularly designed, and is self-adaptive to the number of modules and single / three-phase inverters, without the need to classify the batteries in the aspects of research and development, production, sales, and storage;

[0217] 4. The low-voltage battery system can work in frequency modulation through the first DCDC module, and adaptively identify the ideal working interval of the single-phase inverter and the three-phase inverter, or control the output voltage of the low-voltage battery system in the voltage range allowed by the single-phase inverter and the three-phase inverter, so that the same set of low-voltage battery system can adapt to the single-phase inverter and the three-phase inverter, the product is normalized, the production process is greatly simplified, the production efficiency is improved, the inventory materials are simplified, and the customer management and maintenance are facilitated

[0218] 5. The comprehensive cost of the scheme is low, and the competitiveness is improved.

[0219] In combination with FIG. 22, in one embodiment of the present disclosure, the battery system 100 includes a low-voltage battery system, the low-voltage battery system includes a low-voltage battery 120 and a first DCDC module 130 connected to the low-voltage battery 120; the hybrid inverter 200 further includes a second DCDC module 210 connected to the DC bus, the second DCDC module 210 is also adapted to connect the first DCDC module 130, and the second DCDC module 210 is also adapted to communicate with the first DCDC module 130 through a hard-wired signal; the controller 400 is used to control the second DCDC module 210 to start under the condition that the low-voltage battery system meets the preset starting condition, and send a fast starting instruction to the first DCDC module 130 through a hard-wired signal, so that the first DCDC module 130 starts synchronously with the second DCDC module 210 based on the fast starting instruction.

[0220] Specifically, taking the photovoltaic energy storage system as an example, the DC side of the hybrid inverter 200 is connected with the photovoltaic module and the battery system, and the AC side of the hybrid inverter 200 is connected with the load and the AC power grid (i.e. external power source), wherein the photovoltaic module and the battery system are connected to the DC bus of the hybrid inverter 200. It can be understood that the battery system can output electric energy to the load connected with the hybrid inverter 200 for power supply, and the AC power grid connected with the hybrid inverter 200, i.e. the external power source, can also charge the battery system.

[0221] The hybrid inverter 200 can be connected to a high-voltage battery system or a low-voltage battery system and has a second DCDC module 210, a controller 400, a sampling module, etc. When the hybrid inverter 200 is connected to a low-voltage battery system, as shown in FIG. 22, the low-voltage battery 120 in the low-voltage battery system is first connected to the first DCDC module 130, and then the first DCDC module 130 is connected to the second DCDC module 210 to complete the connection between the low-voltage battery system and the hybrid inverter 200. When the first DCDC module 130 and the second DCDC module 210 are both in the starting state, the energy in the low-voltage battery 120 can be output to the DC bus. The low-voltage battery system and the hybrid inverter 200 have a power interface, a communication interface, a hardware signal interface, etc., that is, the second DCDC module 210 can be connected to the first DCDC module 130 through the power interface, the communication interface, and the hardware signal interface. In addition to the communication interface, the second DCDC module 210 can also communicate with the first DCDC module 130 through the hardware signal interface based on the hardware signal interface, and the specific communication division can be determined according to the situation. The application of the first DCDC module 130 in the low-voltage battery system has low technical difficulty, short development cycle, and low application cost.

[0222] When the hybrid inverter 200 is connected to a high-voltage battery system, as shown in FIG. 23, the high-voltage battery 110 is directly connected to the second DCDC module 210, and when the second DCDC module 210 is in the starting state, the energy in the high-voltage battery 110 can be output to the DC bus. The high-voltage battery 110 and the hybrid inverter 200 have a power interface and a communication interface, and the second DCDC module 210 can communicate with the first DCDC module 130 through the communication interface.

[0223] In addition, when the hybrid inverter 200 is connected to a low-voltage battery system and the hybrid inverter 200 is supplying power to a load, if the output energy of the photovoltaic module is sufficient to support the output energy demand of the hybrid inverter, the second DCDC module 210 and the first DCDC module 130 are controlled to enter the standby state to save the energy consumption of the low-voltage battery 120.

[0224] When the output energy of the photovoltaic module cannot support the output energy demand of the hybrid inverter at a certain moment, for example, the AC side of the energy storage inverter is suddenly connected to a large load, and the total load after connection is greater than the total power generation of the photovoltaic module, then the low-voltage battery system needs to supplement the energy of the DC bus of the hybrid inverter to prevent the entire energy storage system from collapsing, at this time, it is determined that the low-voltage battery system meets the preset starting condition, the controller of the hybrid inverter controls the second DCDC module 210 to start, and at the same time, sends a fast start instruction to the first DCDC module 130 based on the hardware signal through the hardware signal interface based on the hardware signal, so that the first DCDC module 130 starts synchronously with the second DCDC module 210 based on the fast start instruction, so as to realize the fast start output energy of the low-voltage battery 120 based on the started first DCDC module 130 and the second DCDC module 210, and supplement the energy of the DC bus of the hybrid inverter 200 at this time, and the photovoltaic module and the low-voltage battery supply power at the same time.

[0225] Wherein, the hardware signal interface is an IO interface, and the hardware signal is a high-level signal and a low-level signal, for example, when the hardware signal is a high-level signal, it is a fast start instruction; when the hardware signal is a low-level signal, it is a standby instruction, then the first DCDC module 130 is fast started when receiving a high-level signal, and the first DCDC module 130 stops working when receiving a low-level signal.

[0226] It should be further pointed out that the DCDC module in the present application can be an LLC, DAB, BUCK, BOOST, etc. Direct current conversion module, the hardware signal can be dry contact, level signal conversion, level inversion, button, etc. Form, specific not limited.

[0227] As shown in FIGS. 5 and 6, according to one embodiment of the present disclosure, the hybrid inverter 200 further comprises a DCAC module 220, the DC side of the DCAC module 220 is connected with the DC bus, and the AC side of the DCAC module 220 is adapted to be connected with the load, wherein the controller 400 is further used for: in the process of controlling the DCAC module 220 to work to supply power to the load, acquiring the DC bus voltage of the DC bus, and acquiring the voltage difference between the DC bus reference voltage and the DC bus voltage, and in the case that the voltage difference is greater than the first preset voltage difference, determining that the low-voltage battery system meets the preset starting condition.

[0228] Specifically, taking the photovoltaic energy storage system shown in FIG. 5 as an example, the new energy power generation device 300 is a photovoltaic module, the new energy power generation device 300 and the low-voltage battery system are both connected to the DC bus of the hybrid inverter 200, and in the case that the DCAC module 220 supplies power to the load, the DCAC module 220 directly takes DC power from the DC bus, converts the DC power into AC power, and then outputs the AC power to supply power to the load. The DC bus is an energy collection channel of the new energy power generation device 300 and the low-voltage battery system.

[0229] The controller 400 determines whether the low-voltage battery system meets the preset starting condition according to the size relationship between the voltage difference between the DC bus reference voltage and the DC bus voltage and the first preset voltage difference,

[0230] According to one embodiment of the present disclosure, the controller 400 is further configured to: after the first DCDC module 130 and the second DCDC module 210 are synchronously started, determine the load demand power of the load, obtain a first power by multiplying the load demand power, the voltage difference, and a preset voltage-power conversion coefficient, and obtain the output power of the second DCDC module 210 by adding the first power and a preset power margin.

[0231] According to one embodiment of the present disclosure, the controller 400 is further configured to: after the first DCDC module 130 and the second DCDC module 210 are synchronously started, obtain an absolute value of the voltage difference between the DC bus reference voltage and the DC bus voltage, and control the second DCDC module 210 and the first DCDC module 130 to maintain the current working state in the case that the absolute value of the voltage difference is less than a second preset voltage difference.

[0232] According to one embodiment of the present disclosure, the hybrid inverter 200 further comprises a third DCDC module 230, one end of the third DCDC module 230 is connected to the DC bus, and the other end of the third DCDC module 230 is adapted to be connected to the new energy power generation device 300, and the controller 400 is further configured to: control the third DCDC module 230 to work, so that the new energy power generation device 300 supplies power to the load through the third DCDC module 230 and the DCAC module 220.

[0233] It should be noted that, in addition to supplying power to the load through the third DCDC module 230 and the DCAC module 220, the new energy power generation device 300 can also charge the high-voltage battery 110 through the third DCDC module 230 and the second DCDC module 210, or charge the low-voltage battery 120 through the third DCDC module 230, the second DCDC module 210, and the first DCDC module 130.

[0234] According to one embodiment of this disclosure, the battery system 100 includes a low-voltage battery system or a high-voltage battery system, and the controller 400 is further configured to: respond to an access signal from a target battery system and send an identification information acquisition instruction to the target battery system; wherein the target battery system is a low-voltage battery system or a high-voltage battery system; respond to a response instruction with identification information sent by the target battery system, acquire the identification information, and acquire a control program corresponding to the target battery system based on the identification information; and control the target battery system based on the control program.

[0235] Specifically, in the case where the energy storage system includes a low-voltage battery system, as shown in Figure 24, COM is the communication connection line, Poer is the power connection line, the hardware signal is the hardware level signal, and the button signal is the voltage signal triggered by the control button. The control button is set to the first DC-DC module 130. When the operator controls the control button to operate, the button signal triggered by the control button is simultaneously sent to the first DC-DC module 130, the hybrid inverter 200, and the low-voltage battery 120.

[0236] In the case of an energy storage system including a high-voltage battery system, as shown in Figure 25, COM is a communication connection line, Poer is a power connection line, and the button signal is a voltage signal triggered by the control button. The control button is set to correspond to the high-voltage battery 110. When the operator controls the control button to act, the button signal is sent to both the high-voltage battery 110 and the hybrid inverter.

[0237] The button signal can be used to power on and off the battery system.

[0238] Taking an energy storage system, including a low-voltage battery system, as an example, the function of the button signal is as follows:

[0239] ① The low-voltage battery system (first DC-DC module 130, low-voltage battery 120 and second DC-DC module 210) is powered off via button signal;

[0240] ② The low-voltage battery system (first DC-DC module 130, low-voltage battery 120 and second DC-DC module 210) is powered on via button signal;

[0241] Under normal circumstances, after the battery system is connected to the hybrid inverter, staff can control the energy storage system via a mobile app through the established communication network to perform functions such as starting and stopping. This can be achieved by sending corresponding control signals to the hybrid inverter or to both the hybrid inverter and the battery system. However, when the network infrastructure is disrupted due to force majeure (such as war, weather, geological disasters, etc.), staff cannot control the energy storage system via mobile phone. In this case, button signals serve as manual control signals, providing a reliable emergency response.

[0242] For example, in the energy storage system provided with the low-voltage battery system, when the low-voltage battery 120 is shut down due to empty power (power shortage), and the first DCDC module 130 and the second DCDC module 210 are in the shutdown state, if it is necessary to start the first DCDC module 130 and the second DCDC module 210 to charge the low-voltage battery 120, the second DCDC module 210 and the first DCDC module 130 can be started through the button signal, and the low-voltage battery 120 is charged through the alternating current provided by the alternating current grid or the power provided by the new energy power generation device 300; when the low-voltage battery 120 has sufficient power but is in the shutdown state, if the alternating current grid is powered off in the evening or in the case of insufficient sunlight on cloudy days, and battery energy is needed for power supply, the low-voltage battery 120 and the first DCDC module 130 and the second DCDC module 210 can be activated through the manual button signal to supply power to the user side.

[0243] As shown in FIGS. 24, 25, 5 and 6, according to one embodiment of the present disclosure, the hybrid inverter 200 includes a plurality of DCAC modules 220 of the hybrid inverter 200, the AC sides of the plurality of DCAC modules 220 are connected in parallel to realize the function of parallel expansion of the hybrid inverter 200, to realize the expansion of grid-connected power and meet different load demands. It should be noted that COM is a communication signal.

[0244] Therefore, on the basis of the traditional hybrid inverter scheme, this embodiment combines the needs of development cycle, cost, installability, compatibility and the like, and proposes an innovative energy storage system technical scheme, and the specific advantages are as follows:

[0245] 1. The same hybrid inverter 200 can realize the compatible adaptation of the high-voltage battery system and the low-voltage battery system, and the high-voltage battery system and the low-voltage battery system can be adaptively matched during installation.

[0246] 2. The number of product codes is reduced, and the production, storage, transportation, installation and maintenance costs are greatly reduced.

[0247] 3. The development technology is low in difficulty, the development cycle is short, and the energy storage market demand in the current fierce competition is met.

[0248] 4. The comprehensive cost of the scheme is low, and the competitiveness is improved.

[0249] 5. The synchronous and rapid start of the second DCDC module and the first DCDC module is realized by relying on the hardware level signal, has the function of large load dynamic cut-in, and the response speed is fast.

[0250] It should be noted that the details not disclosed in the energy storage system of the embodiment of the present disclosure are referred to the details disclosed in the control method of the energy storage system of the above-mentioned embodiments of the present disclosure, and will not be described here.

[0251] According to the energy storage system provided in the embodiments of the present disclosure, the hybrid inverter is adapted to be connected to the battery system, and the hybrid inverter further comprises a controller configured to acquire the type of the hybrid inverter and control the hybrid inverter to work in the case that the parameter of the battery system matches the type. The parameter is used to represent the output voltage of the battery system. Thus, the energy storage system can automatically determine whether the battery system and the hybrid inverter match based on the parameter of the battery system and the type of the hybrid inverter, and control the hybrid inverter to work in the case that the parameter of the battery system matches the type, thereby reducing the manual participation and lowering the application cost.

[0252] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a list of executable instructions for implementing logic functions, and can be specifically embodied in any computer-readable storage medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or in conjunction with these instruction execution systems, apparatus or devices. For the purpose of this specification, the "computer-readable storage medium" can be any device that can contain, store, communicate, propagate or transport programs for use by or in connection with an instruction execution system, apparatus or device, or in conjunction with these instruction execution systems, apparatus or devices. More specific examples (non-exhaustive list) of computer-readable storage media include the following: electrical connections having one or more wires (electrical devices), portable computer disks (magnetic devices), random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memories), fiber optic devices, and portable compact disc read-only memories (CD ROMs). In addition, the computer-readable storage medium can even be paper or other suitable medium on which the program can be printed, because the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or otherwise processing the program as necessary, and then storing it in a computer memory.

[0253] It should be understood that parts of the present disclosure can be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gates for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gates, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0254] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0255] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0256] In addition, the terms "first", "second", and the like used in the embodiments of the present disclosure are only for the purpose of description and can not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined with the terms "first", "second" and the like in the embodiments of the present disclosure can explicitly or implicitly indicate that the embodiments include at least one of the features. In the description of the present disclosure, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, etc., unless otherwise specifically limited in the embodiments.

[0257] In the present disclosure, unless otherwise specifically defined or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be broadly understood, for example, the connection can be a fixed connection, or a detachable connection, or integrated, which can be understood, or can be a mechanical connection, an electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific implementation situation.

[0258] In the present disclosure, unless specifically stated and limited otherwise, a first feature is "on", "above", or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact with an intermediate medium. Moreover, the first feature "over", "above", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below", and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0259] It should be noted that any technical features in the above embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure.

[0260] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above embodiments are exemplary, and should not be construed as limiting the present disclosure, and those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for controlling an energy storage system, the energy storage system comprising a hybrid inverter and a battery system, the hybrid inverter being adapted to be connected to the battery system, the method comprising: obtaining a type of the hybrid inverter; and controlling the hybrid inverter to operate in a case where a parameter of the battery system matches the type, wherein the parameter is used to represent an output voltage of the battery system. The battery system comprises a high-voltage battery system, the high-voltage battery system comprising a plurality of high-voltage battery modules connected in series, the method further comprising: obtaining attribute parameters of the plurality of high-voltage battery modules; and determining whether the parameter of the battery system matches the type based on the attribute parameters, wherein the attribute parameters comprise a number of the plurality of high-voltage battery modules and a total output voltage of the plurality of high-voltage battery modules. The type comprises single-phase or three-phase, and the determining whether the parameter of the battery system matches the type based on the attribute parameters comprises: determining that the parameter of the battery system matches the type in a case where the attribute parameters are greater than or equal to a first parameter threshold and less than a second parameter threshold, and the type is single-phase; determining that the parameter of the battery system matches the type in a case where the attribute parameters are greater than or equal to the second parameter threshold and less than or equal to a third parameter threshold; and determining that the parameter of the battery system matches the type in a case where the attribute parameters are greater than the third parameter threshold and less than or equal to a fourth parameter threshold, and the type is three-phase; wherein the first parameter threshold < the second parameter threshold < the third parameter threshold < the fourth parameter threshold.

2. The method of claim 1, wherein, The plurality of high-voltage battery modules have the same voltage level, and the attribute parameters comprise the number of the plurality of high-voltage battery modules, the method further comprising: obtaining a voltage level of the high-voltage battery modules; and determining the first parameter threshold, the second parameter threshold, the third parameter threshold and the fourth parameter threshold based on the voltage level and the type. The battery system comprises a low-voltage battery system, the low-voltage battery system comprising a low-voltage battery and a first DCDC module, the method further comprising: sending the type to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameter of the battery system matches the type. The type comprises single-phase or three-phase, and the target voltage is greater than or equal to a first voltage threshold and less than or equal to a third voltage threshold in a case where the type is single-phase; and the target voltage is greater than or equal to a second voltage threshold and less than or equal to a fourth voltage threshold in a case where the type is three-phase; wherein the target voltage is greater than or equal to the second voltage threshold and less than or equal to the third voltage threshold in a case where the first DCDC module does not receive the type; and the first voltage threshold < the second voltage threshold < the third voltage threshold < the fourth voltage threshold.

3. The method of claim 2, wherein, The first DCDC module determines a switching frequency and / or a gain of itself based on the type, wherein the gain is a ratio of an output voltage to an input voltage of the first DCDC module. ​ ​ ​ ​ 4. The method of claim 3, wherein, ​ ​ ​ 5. The method of claim 1, wherein, ​ ​ 6. The method of claim 5, wherein, ​ ​ ​ ​ 7. The method of claim 5 or 6, wherein, ​ 8. The method according to any one of claims 5-7, wherein, The hybrid inverter comprises a second DCDC module connected with the DC bus, the second DCDC module is adapted to connect the first DCDC module, and the second DCDC module is also adapted to communicate with the first DCDC module through a hard-wired signal, and the method comprises: In the case that the low-voltage battery system meets the preset starting condition, the second DCDC module is controlled to start, and a fast starting instruction is sent to the first DCDC module through the hard-wired signal, so that the first DCDC module starts synchronously with the second DCDC module based on the fast starting instruction.

9. The method of claim 8, wherein, The hybrid inverter further comprises a DCAC module, the DC side of the DCAC module is connected with the DC bus, and the AC side of the DCAC module is adapted to connect a load, wherein the preset starting condition of the low-voltage battery system is determined by the following methods: During the process of controlling the DCAC module to work to supply power to the load, the DC bus voltage of the DC bus is acquired; The voltage difference between the DC bus reference voltage and the DC bus voltage is acquired; In the case that the voltage difference is greater than a first preset voltage difference, it is determined that the low-voltage battery system meets the preset starting condition.

10. The method of claim 9, wherein, After the first DCDC module and the second DCDC module start synchronously, the method further comprises: The load demand power of the load is determined; The product of the load demand power, the voltage difference and a preset voltage power conversion coefficient is acquired to obtain a first power, and the sum of the first power and a preset power margin is acquired to obtain the output power of the second DCDC module.

11. The method of claim 9 or 10, wherein, After the first DCDC module and the second DCDC module start synchronously, the method further comprises: The absolute value of the voltage difference between the DC bus reference voltage and the DC bus voltage is acquired; In the case that the absolute value of the voltage difference is less than a second preset voltage difference, the second DCDC module and the first DCDC module are controlled to keep the current working state.

12. The method according to any one of claims 9-11, wherein, The hybrid inverter further comprises a third DCDC module, one end of the third DCDC module is connected with the DC bus, and the other end of the third DCDC module is adapted to connect a new energy power generation device, and the method further comprises: The third DCDC module is controlled to work, so that the new energy power generation device supplies power to the load through the third DCDC module and the DCAC module.

13. The method of any one of claims 1-12, wherein, The battery system comprises a low-voltage battery system or a high-voltage battery system, and the method further comprises: In response to an access signal of a target battery system, an identification information acquisition instruction is sent to the target battery system; wherein the target battery system is the low-voltage battery system or the high-voltage battery system; In response to a response instruction with identification information sent by the target battery system, the identification information is acquired, and a control program corresponding to the target battery system is acquired based on the identification information; The target battery system is controlled based on the control program.

14. A controller comprising a memory, a processor, and a control program of an energy storage system stored on the memory and executable on the processor, wherein the processor implements the control method of the energy storage system according to any one of claims 1-13 when executing the control program of the energy storage system.

15. An energy storage system comprising: a battery system; a hybrid inverter adapted to be connected to the battery system, the hybrid inverter further comprising a controller configured to obtain a type of the hybrid inverter and control the hybrid inverter to operate in a case where a parameter of the battery system matches the type, wherein the parameter is used to represent an output voltage of the battery system.

16. The energy storage system of claim 15, wherein, the battery system comprises a high-voltage battery system including a plurality of high-voltage battery modules connected in series, and the hybrid inverter is adapted to be connected to the plurality of high-voltage battery modules; the controller is further configured to obtain an attribute parameter of the plurality of high-voltage battery modules, and determine whether the parameter of the battery system matches the type based on the attribute parameter, wherein the attribute parameter comprises a number / total output voltage of the plurality of high-voltage battery modules.

17. The energy storage system of claim 15, wherein, the battery system comprises a low-voltage battery system including a low-voltage battery and a first DCDC module connected to the low-voltage battery, and the hybrid inverter is adapted to be connected to the first DCDC module; the controller is further configured to send the type to the first DCDC module, so that the first DCDC module outputs a target voltage based on the type, so that the parameter of the battery system matches the type.

18. The energy storage system of claim 15 or 17, wherein the battery system comprises a low-voltage battery system including a low-voltage battery and a first DCDC module connected to the low-voltage battery; the hybrid inverter further comprises a second DCDC module connected to a DC bus, the second DCDC module is further adapted to be connected to the first DCDC module, and the second DCDC module is further adapted to communicate with the first DCDC module through a hard-wired signal; the controller is further configured to control the second DCDC module to start up and send a fast start instruction to the first DCDC module through the hard-wired signal in a case where the low-voltage battery system satisfies a preset start condition, so that the first DCDC module starts up synchronously with the second DCDC module based on the fast start instruction.

19. The energy storage system of claim 18, wherein, the hybrid inverter further comprises a DCAC module, a DC side of the DCAC module is connected to the DC bus, and an AC side of the DCAC module is adapted to be connected to a load, wherein the controller is further configured to obtain a DC bus voltage of the DC bus and obtain a voltage difference between a DC bus reference voltage and the DC bus voltage in a process of controlling the DCAC module to operate to supply power to the load, and determine that the low-voltage battery system satisfies the preset start condition in a case where the voltage difference is greater than a first preset voltage difference.

20. The energy storage system of claim 19, wherein, The controller is further configured to: after the first DCDC module and the second DCDC module are synchronously started, determine a load demand power of the load, obtain a first power by multiplying the load demand power, a voltage difference value and a preset voltage power conversion coefficient, and obtain an output power of the second DCDC module by adding the first power and a preset power margin.

21. The energy storage system of claim 19 or 20, wherein, The controller is further configured to: after the first DCDC module and the second DCDC module are synchronously started, obtain an absolute value of a voltage difference between the DC bus reference voltage and the DC bus voltage, and control the second DCDC module and the first DCDC module to keep a current working state when the absolute value of the voltage difference is less than a second preset voltage difference.

22. The energy storage system of any of claims 19-21, wherein, The hybrid inverter further comprises a third DCDC module, one end of the third DCDC module is connected with the DC bus, and the other end of the third DCDC module is adapted to be connected with a new energy power generation device, and the controller is further configured to: control the third DCDC module to work, so that the new energy power generation device supplies power to the load through the third DCDC module and the DCAC module.

23. The energy storage system of any of claims 15-22, wherein, The battery system comprises a low-voltage battery system or a high-voltage battery system, and the controller is further configured to: in response to an access signal of a target battery system, send an identification information acquisition instruction to the target battery system; wherein the target battery system is the low-voltage battery system or the high-voltage battery system; in response to a response instruction with identification information sent by the target battery system, obtain the identification information, and obtain a control program corresponding to the target battery system based on the identification information; control the target battery system based on the control program.

24. The system of any one of claims 19-22, wherein, The hybrid inverter comprises a plurality of, and the AC sides of the DCAC modules of the plurality of hybrid inverters are connected in parallel.

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