Control Method of Inverter Hybrid Parallel System and Related Equipment

Abstract

The present application relates to the field of inverter control technology, and discloses a control method for an inverter hybrid parallel system and related devices. The method includes: obtaining the target operating mode of the inverter hybrid parallel system based on an energy management system, where the grid-connected inverter and the energy storage inverter in the inverter hybrid parallel system are arranged in parallel on the AC bus; the energy management system generates a grid-connected inverter output power set value and an energy storage inverter output power set value according to the obtained target operating mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; sending the inverter output power set value to the corresponding inverter through the energy management system, so that the grid-connected inverter and the energy storage inverter adjust the actual values of their respective output powers according to the corresponding output power set values. This method realizes the system-level operation mode control of the inverter hybrid parallel system and improves the control effect of the inverter output power.

Description

Technical Field

[0001] This application relates to the technical field of inverter control, and particularly to a control method for an inverter hybrid parallel system and related devices thereof. Background Art

[0002] With the progress of photovoltaic inverter technology and the reduction of costs, household photovoltaic energy storage systems have gradually become one of the important ways to promote the green transformation of the energy structure. However, with the iteration of technology and the increase in electricity consumption, the original inverters and energy storage batteries are no longer able to meet the current needs, and users usually adopt the method of multi-inverter parallel connection to expand capacity and power.

[0003] Regarding the method of multi-inverter parallel connection: First, due to the lack of communication between inverters during multi-inverter parallel connection, it is impossible to achieve system-level operation mode control (such as different energy output priorities, grid-connected power limits, etc.), and the output power control effect of the inverters is poor, which affects the implementation of the multi-inverter parallel system. Further, when a multi-inverter hybrid parallel connection is made between an energy storage inverter and a grid-connected inverter, how to control the operation mode of the overall system to achieve a preset operation effect, improve the user experience, increase the enthusiasm of users to purchase additional photovoltaic systems, and promote the development of the photovoltaic industry is an urgent problem to be solved. For the above problems in the related technology, no effective solution has been proposed yet. Summary of the Invention

[0004] A control method for an inverter hybrid parallel system and related devices provided by an embodiment of the present invention at least solves the problems in the related technology that it is difficult to achieve system-level operation mode control in an inverter hybrid parallel system, the output power control effect of the inverters is poor, which affects the user experience and limits the popularization and application of the hybrid parallel system.

[0005] To solve the above problems, one aspect of an embodiment of the present invention provides a control method for an inverter hybrid parallel system, including:

[0006] Obtaining the target operation mode of the inverter hybrid parallel system based on an energy management system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus;

[0007] Based on the target operation mode, the energy management system respectively obtains the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generates a grid-connected inverter output power set value and an energy storage inverter output power set value according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device;

[0008] The grid-connected inverter output power setpoint is sent to the grid-connected inverter through the energy management system, and the energy storage inverter output power setpoint is sent to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective actual output power values according to the corresponding output power setpoints.

[0009] In some of these embodiments, before the step of sending the grid-connected inverter output power setpoint to the grid-connected inverter through the energy management system, the method further includes:

[0010] Obtain the grid-connected power threshold through the energy management system, and after generating the grid-connected inverter output power setpoint, determine whether the grid-connected inverter output power setpoint is greater than the grid-connected power threshold; if so, use the grid-connected power threshold as the updated grid-connected inverter output power setpoint.

[0011] In some of these embodiments, the step of the grid-connected inverter and the energy storage inverter adjusting their respective actual output power values according to the corresponding output power setpoints includes:

[0012] If the energy storage inverter output power setpoint is less than the actual output power of the energy storage inverter, and / or the grid-connected inverter output power setpoint is less than the actual output power of the grid-connected inverter, then control the corresponding photovoltaic module through the inverter to reduce the output power of the photovoltaic module, so as to adjust the actual output power value of the inverter to the corresponding output power setpoint;

[0013] If the energy storage inverter output power setpoint is greater than the actual output power of the energy storage inverter, then control the corresponding photovoltaic module through the energy storage inverter to increase the output power of the photovoltaic module and / or control the energy storage battery to discharge; if the grid-connected inverter output power setpoint is greater than the actual output power of the grid-connected inverter, then control the corresponding photovoltaic module through the grid-connected inverter to increase the output power of the photovoltaic module and / or reduce the grid-connected power; so as to adjust the actual output power value of the corresponding inverter to the value closest to the corresponding output power setpoint.

[0014] In some of these embodiments, when the target operation mode is the self-use mode, the energy delivery priorities of the inverter hybrid parallel system are load, energy storage battery, and grid in sequence; when the target operation mode is the grid-connected priority mode, the energy delivery priorities of the inverter hybrid parallel system are load, grid, and energy storage battery in sequence; wherein, based on the energy output priorities indicated by the self-use mode or the grid-connected priority mode, the operating powers of each device in the inverter hybrid parallel system obtained by the energy management system include: the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charge and discharge power of the energy storage battery, and the maximum charge and discharge power of the energy storage battery at the current moment.

[0015] In some of these embodiments, when the target operating mode is the self-consumption mode or the grid-connection priority mode, the method further includes:

[0016] Obtain the grid-connection power threshold, and respectively generate intermediate given values of the output powers of the grid-connected inverter and the energy storage inverter according to the energy output priority indicated by the self-consumption mode or the grid-connection priority mode, the power required by the load, the power of the grid-connected electricity meter, the grid-connection power threshold, and the operating powers of each device, and send the corresponding intermediate given values of the output powers to the corresponding grid-connected inverter and energy storage inverter respectively, so that the grid-connected inverter and the energy storage inverter adjust the actual values of the corresponding output powers according to the intermediate given values of the output powers;

[0017] At the next set moment, obtain again the power required by the load, the power of the grid-connected electricity meter, the grid-connection power threshold, and the operating powers of each device at the set moment, and respectively generate given values of the output powers of the grid-connected inverter and the energy storage inverter in combination with the energy output priority indicated by the self-consumption mode or the grid-connection priority mode.

[0018] In some of these embodiments, when the target operating mode is the energy storage priority mode, the energy delivery priorities of the inverter hybrid parallel system are the load and the grid in sequence, and in the energy storage priority mode, the energy storage battery corresponding to the energy storage inverter does not perform a discharging operation; based on the energy output priority indicated by the energy storage priority mode, the operating powers of each device in the inverter hybrid parallel system obtained by the energy management system include the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charging power of the energy storage battery, and the maximum charging power of the energy storage battery at the current moment.

[0019] In some of these embodiments, the inverter hybrid parallel system includes an energy storage inverter system composed of multiple energy storage inverters and a grid-connected inverter system composed of multiple grid-connected inverters, and the method further includes:

[0020] Based on the energy management system, send the given value of the output power of the grid-connected inverter to the grid-connected inverter system, so that the grid-connected inverter system adjusts the actual values of the output powers of each grid-connected inverter according to the given value of the output power of the grid-connected inverter; based on the energy management system, send the given value of the output power of the energy storage inverter to the energy storage inverter system, so that the energy storage inverter system adjusts the actual values of the output powers of each energy storage inverter according to the given value of the output power of the energy storage inverter.

[0021] To solve the above problems, one aspect of the embodiments of the present invention provides a control device for an inverter hybrid parallel system, which is arranged in an energy management system, and the device includes:

[0022] A target operation mode acquisition module, configured to acquire the target operation mode of the inverter hybrid parallel system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus;

[0023] An output power setpoint generation module, configured to respectively acquire the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system based on the target operation mode, and generate a grid-connected inverter output power setpoint and an energy storage inverter output power setpoint according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device;

[0024] An adjustment module, configured to send the grid-connected inverter output power setpoint to the grid-connected inverter, and send the energy storage inverter output power setpoint to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective actual output power values according to the corresponding output power setpoints.

[0025] In some embodiments, the device further includes a grid-connected power limit module, configured to acquire a grid-connected power threshold, and after generating the grid-connected inverter output power setpoint, determine whether the grid-connected inverter output power setpoint is greater than the grid-connected power threshold; if so, use the grid-connected power threshold as the updated grid-connected inverter output power setpoint.

[0026] To solve the above problems, in one aspect of the embodiments of the present invention, a photovoltaic inverter system is provided. The system includes an energy management system and an inverter hybrid parallel system; wherein,

[0027] The inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter. Both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus;

[0028] The energy management system is communicatively connected to each device in the inverter hybrid parallel system, and is configured to acquire the target operation mode of the inverter hybrid parallel system, acquire the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generate a grid-connected inverter output power setpoint and an energy storage inverter output power setpoint according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; and send the grid-connected inverter output power setpoint to the grid-connected inverter, and send the energy storage inverter output power setpoint to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective actual output power values according to the corresponding output power setpoints.

[0029] Advantages of the embodiments of the present invention: By adopting an energy management system to obtain the target operation mode of the inverter hybrid parallel system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus; based on the target operation mode, the energy management system respectively obtains the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generates a given value of the output power of the grid-connected inverter and a given value of the output power of the energy storage inverter according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; by means of the energy management system sending the given value of the output power of the grid-connected inverter to the grid-connected inverter and sending the given value of the output power of the energy storage inverter to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust the actual value of their respective output powers according to the corresponding given values of the output powers, which overcomes the problems in the related art that it is difficult to achieve system-level operation mode control for the inverter hybrid parallel system including an energy storage inverter and a grid-connected inverter, the control effect of the output power of the inverter is poor, the user experience is poor, which limits the enthusiasm of users to purchase additional photovoltaic systems and restricts the development of the photovoltaic industry. By adding an energy management system to communicate with each device in the inverter hybrid parallel system, it realizes the given control of the output powers of the energy storage inverter and the grid-connected inverter via the energy management system, realizes the operation effect corresponding to the system-level operation mode, improves the user experience, and expands the technical effect of the popularization and application of the inverter hybrid parallel system.

[0030] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present invention more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other embodiments based on these drawings without creative efforts.

[0032] Figure 1 It is a flowchart showing the control method of the inverter hybrid parallel system according to an embodiment of the embodiments of the present invention.

[0033] Figure 2 It is a connection diagram showing the connection of the energy management system with each device, the electrical load, and the power grid in the inverter hybrid parallel system according to another embodiment of the embodiments of the present invention.

[0034] Figure 3It is a schematic diagram of the power control curves of each device in the self-consumption mode without grid connection power limit in an embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the power control curves of each device in the first grid connection power threshold scenario in the self-consumption mode of an embodiment of the present invention.

[0036] Figure 5 It is a schematic diagram of the power control curves of each device in the second grid connection power threshold scenario in the self-consumption mode of an embodiment of the present invention.

[0037] Figure 6 It is a schematic diagram of the framework of the control device of the inverter hybrid parallel system in an embodiment of the present invention.

[0038] Figure 7 It is a schematic diagram of the structure of the electronic device of the present invention. Detailed implementation manners

[0039] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0040] To solve the above problems, an embodiment of the present invention provides a control method for an inverter hybrid parallel system, as Figure 1 shown, the control method of the inverter hybrid parallel system mainly includes:

[0041] Step S101, obtaining the target operation mode of the inverter hybrid parallel system based on the energy management system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus.

[0042] Among them, in the inverter hybrid parallel system provided by the embodiment of the present invention, the energy storage inverter and the grid-connected inverter perform multi-machine hybrid parallel connection. As Figure 2As shown, the energy storage inverter is connected to the photovoltaic module, the energy storage battery and the AC bus. The photovoltaic module provides DC input to the energy storage inverter, which is converted into AC output to the AC bus by the energy storage inverter. The energy storage inverter can also convert the electrical energy of the energy storage battery as input into AC output to the AC bus; the photovoltaic module can also directly charge the battery through the energy storage machine DC bus; the energy storage inverter can also draw electrical energy from the AC bus to charge the energy storage battery. The grid-connected inverter is connected to the photovoltaic module and the AC bus. The photovoltaic module provides DC input to the grid-connected inverter, which is converted into AC output to the AC bus. The grid-connected power of the AC bus is defined as the positive direction (that is, the power value indicated by the grid-connected electricity meter is positive), and the power taken from the grid is the negative direction (that is, the power value indicated by the grid-connected electricity meter is negative).

[0043] The operation mode of the inverter hybrid parallel system indicates the energy output priority of the hybrid parallel system, that is, the supply priority of the energy obtained by the inverter hybrid system from the photovoltaic module via the energy storage inverter and the grid-connected inverter to the load, the energy storage battery, and the grid. It can be understood that according to the specific setting form of the operation mode, when the load is the highest energy output priority, if the energy provided by the photovoltaic module is insufficient, the system can also obtain energy from the energy storage battery and the grid to meet the load power consumption requirements.

[0044] Among them, the energy management system (EMS, Energy Management System) provided by the embodiments of the present invention can be set independently of the inverter hybrid parallel system or integrated inside the inverter hybrid parallel system.

[0045] Through the above settings, with the energy management system as the central controller, first obtain the target operation mode of the inverter hybrid parallel system, which provides guidance for subsequent power distribution and the data to be acquired, helps to ensure that the hybrid parallel system can operate according to the preset operation mode, and thus achieve the preset operation effect; by obtaining the target operation mode, the energy management system can also optimize the energy flow of the hybrid parallel system and improve the energy output efficiency of the hybrid parallel system. For example, give priority to using photovoltaic electric energy when the light is sufficient, and switch to the energy storage battery or grid power supply when the light is insufficient, so as to realize the maximum utilization of energy. In addition, users can also configure and monitor the operation status of the inverter hybrid parallel system through the energy management system, further meet the power consumption requirements of the user load, and improve the user experience.

[0046] According to a specific embodiment of the embodiments of the present invention, the above method further includes: introducing a machine learning algorithm to automatically select the optimal operation mode according to historical data and real-time environmental conditions. For example, by analyzing local weather forecast data, historical power consumption data of user loads to predict photovoltaic power generation, load power consumption load prediction and other data, and then dynamically adjusting the target operation mode to achieve intelligent energy management.

[0047] Step S102: Based on the target operation mode, the energy management system respectively obtains the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generates a given value of the grid-connected inverter output power and a given value of the energy storage inverter output power according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device.

[0048] With the above settings, according to the target operation mode, the load demand, and the real-time operating power data of each device in the hybrid parallel system, the energy management system can dynamically adjust the output powers of the grid-connected inverter and the energy storage inverter. While ensuring the power consumption demand of the user load, it maximally utilizes the photovoltaic electric energy, reduces the dependence on the power grid, improves the energy utilization efficiency, realizes the precise distribution and control of the inverter output power. The precise power distribution helps to balance the energy flow of the system, reduce voltage fluctuations and frequency deviations, and improve the stability and reliability of the system. And by distributing power according to the power required by the load, the system can better respond to the user's power consumption demand, provide a stable power supply, and enhance the user experience.

[0049] According to a specific embodiment of the present invention, during the peak load period of the load, the energy stored in the energy storage battery can also be released through the energy storage inverter to reduce the burden on the power grid; during the low load period, the redundant electric energy can be transmitted to the power grid through the grid-connected inverter to achieve peak shaving and valley filling and reduce the electricity cost.

[0050] According to the embodiment of the present invention, the above method further includes: setting a fault detection and fault tolerance control mechanism, and based on the energy management system, fault detection is performed on the energy storage inverter, the grid-connected inverter, and the photovoltaic module. When a certain inverter or photovoltaic module fails, the output power of other inverters is automatically adjusted through the energy management system (implemented by setting the corresponding given value of the output power and sending the control signal corresponding to this value to the corresponding inverter) to ensure the continuous operation of the hybrid parallel system.

[0051] In some of these embodiments, before the step of sending the given value of the grid-connected inverter output power to the grid-connected inverter through the energy management system, the above method further includes: obtaining a grid-connected power threshold through the energy management system, and after generating the given value of the grid-connected inverter output power, determining whether the given value of the grid-connected inverter output power is greater than the grid-connected power threshold; if so, using the grid-connected power threshold as the updated given value of the grid-connected inverter output power.

[0052] Due to the requirements of the power grid, there are often certain restrictions on the grid-connected power of household energy storage systems. Therefore, while achieving the target operation mode, it is also necessary to consider the grid-connected power limit (i.e., the above-mentioned grid-connected power threshold, which is determined according to the actual situation in each region). The setting of the grid-connected power threshold can not only meet the requirements of the power grid but also dynamically adjust the grid-connected power threshold in combination with the real-time grid status, weather conditions, and load power consumption demands. Further, according to the embodiments of the present invention, a multi-level grid-connected power threshold can also be designed (the multi-level grid-connected power threshold refers to setting different thresholds according to different time periods or different working conditions).

[0053] Based on the above settings, by judging whether the generated grid-connected inverter output power set value is greater than the grid-connected power threshold after generating it and adjusting it to the grid-connected power threshold when necessary, it can be ensured that the grid-connected power of the hybrid parallel system does not exceed the limit specified by the power grid. This helps to avoid power outages or other problems caused by over-limitation and ensures the safe operation of the hybrid parallel system. It can also reduce voltage fluctuations and frequency deviations and improve the stability and reliability of the hybrid parallel system. At the same time, based on the above grid-connected power limit, the energy in the energy storage battery can be released through the energy storage inverter to meet the load power consumption demands, thereby maximizing the utilization of photovoltaic power, reducing the dependence on the power grid, and improving the utilization efficiency of green energy.

[0054] In some of the embodiments, when the target operation mode is the self-use mode, the energy delivery priorities of the inverter hybrid parallel system are the load, the energy storage battery, and the power grid in sequence; when the target operation mode is the grid-connected priority mode, the energy delivery priorities of the inverter hybrid parallel system are the load, the power grid, and the energy storage battery in sequence; wherein, based on the energy output priorities indicated by the self-use mode or the grid-connected priority mode, the operating powers of each device in the inverter hybrid parallel system obtained by the energy management system include: the output power of the energy storage inverter at the current moment, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charge and discharge power of the energy storage battery, and the maximum charge and discharge power of the energy storage battery.

[0055] Among them, the inverter hybrid parallel system provided by the embodiments of the present invention is a household energy storage system, which needs to give priority to meeting the power consumption demands of user loads. Therefore, the highest priority in its operation mode is to supply power to the load. The main difference between the self-use mode and the grid-connected priority mode lies in whether to supply power to the power grid or the energy storage battery first at the second priority. Therefore, based on the different operation modes, there are slightly differences in the specific objects of the operating power data of each device in the inverter hybrid parallel system obtained by the energy management system.

[0056] By setting different operating modes and configuring different energy delivery priorities, the energy management system can reasonably allocate and utilize energy according to the target operating mode (self-consumption mode or grid-connection priority mode), thereby achieving the effect of balancing the energy flow in the hybrid parallel system, reducing voltage fluctuations and frequency deviations, providing a more stable power supply, and further improving the stability and reliability of the hybrid parallel system, enhancing the user experience, and achieving the goal of maximizing the utilization of photovoltaic power, reducing dependence on the grid, and improving energy utilization efficiency.

[0057] Specifically, according to a specific embodiment of the present invention, in the self-consumption mode, the hybrid parallel system first satisfies the needs of local loads, stores the excess electrical energy in the energy storage battery, and finally delivers it to the grid. This helps users save electricity bills and improve the self-sufficiency of the system. At the same time, in the grid-connection priority mode, the hybrid parallel system first satisfies the needs of local loads, then directly delivers the excess electrical energy to the grid, and finally considers the energy storage battery. This helps users obtain more revenue from selling electricity to the grid company.

[0058] In some embodiments, when the target operating mode is the self-consumption mode or the grid-connection priority mode, the above method further includes: obtaining the grid-connection power threshold, generating intermediate given values of the output power corresponding to the grid-connection inverter and the energy storage inverter respectively according to the energy output priority indicated by the self-consumption mode or the grid-connection priority mode, the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating power of each device, and sending the corresponding intermediate given values of the output power to the corresponding grid-connection inverter and energy storage inverter respectively, so that the grid-connection inverter and the energy storage inverter adjust the actual output power values accordingly according to the intermediate given values of the output power; at the next set moment, obtain again the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating power of each device at the set moment, and generate the given values of the output power corresponding to the grid-connection inverter and the energy storage inverter respectively in combination with the energy output priority indicated by the self-consumption mode or the grid-connection priority mode.

[0059] Considering the volatility of load power consumption, photovoltaic power generation, and the limitation of the grid-connection power threshold, the given values of the output power can be generated step by step, that is, by re-obtaining the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating power of each device at each set moment, and generating new given values of the output power according to these data, the energy management system realizes the dynamic adjustment of the output power of the grid-connection inverter and the energy storage inverter, improves the real-time response ability of the hybrid parallel system, enhances the flexibility and adaptability of the hybrid parallel system, and further achieves better control effects and preset operating effects.

[0060] According to a specific embodiment of the present invention, in order to demonstrate the control effect of the present invention embodiment combined with the grid-connection power limit, such as Figure 3 、Figure 4 and Figure 5 respectively show the case simulation embodiments of three scenarios: Scenario (1) self-consumption mode (grid connection power is not restricted); Scenario (2) self-consumption mode (grid connection restricted power = 6000 W); Scenario (3) self-consumption mode (grid connection restricted power = 0 W). At the same time, in this simulation embodiment, it is set that the rated output power of the energy storage inverter = 10kW, the energy storage battery capacity = 10 kW•h, the initial SOC of the energy storage battery = 100%, the maximum charging power of the energy storage battery = 5kW, and the maximum discharging power of the energy storage battery = 5 kW. The rated power of the grid-connected inverter = 10 kW. The power required by the load is the typical household power. The available photovoltaic power generation is the typical photovoltaic power generation power on a sunny day. As Figure 3 、 Figure 4 and Figure 5 can be seen from the power control curves, adopting the grid connection power limit strategy executed by the grid connection power threshold can, while achieving the control effect of the system-level operation mode of the inverter hybrid parallel system, implement the control of grid connection power limit, which helps to improve the energy utilization efficiency.

[0061] In some of these embodiments, when the target operation mode is the energy storage priority mode, the energy delivery priorities of the inverter hybrid parallel system are the load and the grid in sequence, and in the energy storage priority mode, the energy storage battery corresponding to the energy storage inverter does not perform a discharging operation; based on the energy output priorities indicated by the energy storage priority mode, the operating powers of each device in the inverter hybrid parallel system obtained by the energy management system include the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charging power of the energy storage battery, and the maximum charging power of the energy storage battery at the current moment.

[0062] Adopting the energy storage priority mode helps to protect the energy storage battery and avoid shortening the battery life caused by excessive battery discharge. In this mode, there is no need to consider the discharging operation of the energy storage battery, so the current discharging power and the maximum discharging power of the energy storage battery do not need to be obtained; only the corresponding output power given value needs to be generated under the condition of meeting the load power consumption demand and the grid connection power limit.

[0063] Step S103, send the grid-connected inverter output power given value to the grid-connected inverter through the energy management system, and send the energy storage inverter output power given value to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective actual output power values according to the corresponding output power given values.

[0064] The output power setpoints of the grid-connected inverter and the energy storage inverter are sent to the corresponding inverters through the energy management system, ensuring that each inverter can adjust its actual output power according to the precise power command. This improves the output power control accuracy of the inverter, enabling the hybrid parallel system to more accurately meet the requirements of the target operating mode. Through precise power control, the system can balance the energy flow, reduce voltage fluctuations and frequency deviations, and improve the stability and reliability of the system.

[0065] In some of these embodiments, the steps for the above grid-connected inverter and energy storage inverter to adjust their respective actual output power values according to the corresponding output power setpoints include: If the output power setpoint of the energy storage inverter is less than the actual output power value of the energy storage inverter, and / or the output power setpoint of the grid-connected inverter is less than the actual output power value of the grid-connected inverter, then the corresponding photovoltaic modules are controlled by the inverter to reduce the output power of the photovoltaic modules, so as to adjust the actual output power value of the inverter to the corresponding output power setpoint; If the output power setpoint of the energy storage inverter is greater than the actual output power value of the energy storage inverter, then the corresponding photovoltaic modules are controlled by the energy storage inverter to increase the output power of the photovoltaic modules and / or control the energy storage battery to discharge; If the output power setpoint of the grid-connected inverter is greater than the actual output power value of the grid-connected inverter, then the corresponding photovoltaic modules are controlled by the grid-connected inverter to increase the output power of the photovoltaic modules and / or reduce the grid-connected power; so as to adjust the actual output power value of the corresponding inverter to a value closest to the corresponding output power setpoint.

[0066] By comparing the output power setpoint with the actual value in real time, the hybrid parallel system can precisely adjust the energy flow among the photovoltaic modules, the energy storage battery, and the power grid, making the power output of the hybrid parallel system highly consistent with the target operating mode and improving the control accuracy for the hybrid parallel system.

[0067] Specifically, when the output power setpoint of the energy storage inverter is less than the actual value: By reducing the output power of the photovoltaic modules, the energy entering the energy storage inverter can be reduced, and its actual output power value can be reduced to the setpoint. This helps prevent overcharging of the energy storage battery, prolongs the battery life, and improves the reliability and stability of the system.

[0068] When the output power setpoint of the grid-connected inverter is less than the actual value: By reducing the output power of the photovoltaic modules, the energy entering the grid-connected inverter can be reduced, and its actual output power value can be reduced to the setpoint. This helps ensure that the grid-connected power does not exceed the limits specified by the power grid, avoids over-limit problems, and improves the safety of the system.

[0069] When the given value of the output power of the energy storage inverter is greater than the actual value: By increasing the output power of the photovoltaic modules, the energy entering the energy storage inverter can be increased, so that the actual value of its output power increases to the given value. If the output power of the photovoltaic modules is insufficient to reach the given value, the energy can be supplemented by controlling the discharge of the energy storage battery to meet the given value. This helps to ensure that the output power of the energy storage inverter reaches the given value, meets the energy requirements of the system, and improves the response speed and flexibility of the system.

[0070] When the given value of the output power of the grid-connected inverter is greater than the actual value: By increasing the output power of the photovoltaic modules, the energy entering the grid-connected inverter can be increased, so that the actual value of its output power increases to the given value. If the output power of the photovoltaic modules is insufficient to reach the given value, the grid-connected power can be reduced to balance the energy flow of the system to meet the given value. This helps to ensure that the output power of the grid-connected inverter reaches the given value, meets the energy requirements of the system, and maintains the stability of the system at the same time.

[0071] It should be noted that since the total energy output of the inverter hybrid parallel system is affected by the photovoltaic power generation state, the energy storage battery state, and the grid state, the adjustment of the actual value of the output power of the inverter to the given value of the output power mentioned above cannot be achieved under all working conditions. In such a state, it is only necessary to adjust the actual value of the output power of the inverter to the value closest to the given value of the output power. At this time, the operating effect preset by the target operating mode can also be achieved to the greatest extent.

[0072] In some of the embodiments, the inverter hybrid parallel system includes an energy storage inverter system composed of a plurality of energy storage inverters and a grid-connected inverter system composed of a plurality of grid-connected inverters. The above method further includes: sending the given value of the output power of the grid-connected inverter to the grid-connected inverter system based on the energy management system, so that the grid-connected inverter system adjusts the actual value of the output power of each grid-connected inverter according to the given value of the output power of the grid-connected inverter; sending the given value of the output power of the energy storage inverter to the energy storage inverter system based on the energy management system, so that the energy storage inverter system adjusts the actual value of the output power of each energy storage inverter according to the given value of the output power of the energy storage inverter.

[0073] The above steps provide another control strategy for the inverter hybrid parallel system, that is, introducing the concepts of the main system and the sub-system, constructing a storage inverter system based on multiple storage inverters in the inverter hybrid parallel system, and constructing a grid-connected inverter system based on multiple grid-connected inverters in the inverter hybrid parallel system. Among them, both sub-systems (the storage inverter system and the grid-connected inverter system) establish communication with the energy management system to adjust the actual output power values of the inverters within their respective systems in response to the output power setpoint sent by the energy management system. This ensures the overall coordination and consistency of the system, and avoids the problem of inconsistent control caused by the lack of communication during multi-inverter parallel operation.

[0074] At the same time, the storage inverter system or the grid-connected inverter system can perform more reasonable energy distribution for all the storage inverters or all the grid-connected inverters in the system according to the storage inverter output power setpoint or the grid-connected inverter output power setpoint. This helps to maximize the utilization of photovoltaic electric energy, reduce the dependence on the power grid, and improve the energy utilization efficiency. Through the centralized control of the energy management system, the energy flow of the system can be balanced, voltage fluctuations and frequency deviations can be reduced, and the stability and reliability of the system can be improved. This helps to provide a more stable power supply and enhance the user experience. The sub-systems (the storage inverter system, the grid-connected inverter system) can ensure that the grid-connected power of the main system (the inverter hybrid parallel system) does not exceed the limits specified by the power grid (such as the grid-connected power threshold) according to the grid-connected meter power and the target operation mode, and avoid power outages or other problems caused by over-limits. This helps to ensure that the inverter hybrid parallel system operates efficiently, stably and reliably, and meets the requirements of various application scenarios.

[0075] The control method of the above inverter hybrid parallel system provided by the embodiments of the present invention, by adopting the method of obtaining the target operation mode of the inverter hybrid parallel system based on the energy management system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus; based on the target operation mode, the energy management system respectively obtains the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generates a given value of the output power of the grid-connected inverter and a given value of the output power of the energy storage inverter according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; by sending the given value of the output power of the grid-connected inverter to the grid-connected inverter and the given value of the output power of the energy storage inverter to the energy storage inverter through the energy management system, so that the grid-connected inverter and the energy storage inverter adjust the actual value of their respective output powers according to the corresponding given values of the output powers, overcomes the problems in the related art that it is difficult to achieve system-level operation mode control for an inverter hybrid parallel system including an energy storage inverter and a grid-connected inverter, the control effect of the output power of the inverter is poor, the user experience is poor, which limits the enthusiasm of users to purchase additional photovoltaic systems and restricts the development of the photovoltaic industry. By adding an energy management system to communicate with each device in the inverter hybrid parallel system, it realizes the given control of the output powers of the energy storage inverter and the grid-connected inverter via the energy management system, realizes the operation effect corresponding to the system-level operation mode, improves the user experience, and expands the technical effect of the popularization and application of the inverter hybrid parallel system.

[0076] Based on the control method of the above inverter hybrid parallel system provided by the embodiments of the present invention, the embodiments of the present invention further provide a control device for an inverter hybrid parallel system, which is applied to an energy management system. The energy management system can be set independently of the inverter hybrid parallel system or integrated inside the inverter hybrid parallel system, such as Figure 6 shown. The control device 600 of the inverter hybrid parallel system includes:

[0077] A target operation mode acquisition module 601, configured to acquire the target operation mode of the inverter hybrid parallel system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus.

[0078] With the above settings, using the energy management system as the central controller, first obtain the target operating mode of the inverter hybrid parallel system, which provides guidance for subsequent power distribution and the data to be acquired, helps ensure that the hybrid parallel system can operate according to the preset operating mode, and thus achieve the preset operating effect; by obtaining the target operating mode, the energy management system can also optimize the energy flow of the hybrid parallel system and improve the energy output efficiency of the hybrid parallel system. For example, when the light is sufficient, give priority to using photovoltaic electric energy, and switch to the energy storage battery or grid power supply when the light is insufficient, so as to achieve the maximum utilization of energy. In addition, users can also configure and monitor the operating status of the hybrid parallel system through the energy management system by themselves, further meeting the power consumption needs of the user load and enhancing the user experience.

[0079] The output power set value generation module 602 is used to respectively obtain the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system based on the target operating mode, and generate the grid-connected inverter output power set value and the energy storage inverter output power set value according to the target operating mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device.

[0080] With the above settings, based on the target operating mode, the load demand, and the real-time operating power data of each device in the hybrid parallel system, the energy management system can dynamically adjust the output power of the grid-connected inverter and the energy storage inverter. While ensuring the power consumption needs of the user load, it maximally utilizes photovoltaic electric energy, reduces the dependence on the grid, improves the energy utilization efficiency, realizes the precise distribution and control of the inverter output power. The precise power distribution helps balance the energy flow of the system, reduce voltage fluctuations and frequency deviations, and improve the stability and reliability of the system. And by allocating power according to the power required by the load, the system can better respond to the user's power consumption needs, provide a stable power supply, and enhance the user experience.

[0081] In some of the embodiments, the control device 600 of the above inverter hybrid parallel system further includes a grid-connected power limit module, which is used to obtain the grid-connected power threshold, and after generating the grid-connected inverter output power set value, determine whether the grid-connected inverter output power set value is greater than the grid-connected power threshold; if so, use the grid-connected power threshold as the updated grid-connected inverter output power set value.

[0082] Based on the above settings, by determining whether the grid-connected inverter output power set value is greater than the grid-connected power threshold after generating it, and adjusting it to the grid-connected power threshold when necessary, it can ensure that the grid-connected power of the hybrid parallel system does not exceed the limit specified by the grid, which helps avoid power outages or other problems caused by over-limit, and ensures the safe operation of the hybrid parallel system. It can also reduce voltage fluctuations and frequency deviations, and improve the stability and reliability of the hybrid parallel system.

[0083] In some of these embodiments, when the target operating mode is the self-consumption mode, the energy delivery priorities of the inverter hybrid parallel system are, in sequence, the load, the energy storage battery, and the power grid; when the target operating mode is the grid-connection priority mode, the energy delivery priorities of the inverter hybrid parallel system are, in sequence, the load, the power grid, and the energy storage battery; wherein, based on the energy output priorities indicated by the self-consumption mode or the grid-connection priority mode, the operating powers of the various devices in the inverter hybrid parallel system obtained by the energy management system include: the output power of the energy storage inverter at the current moment, the output power of the grid-connection inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charge and discharge power of the energy storage battery, and the maximum charge and discharge power of the energy storage battery.

[0084] By setting different operating modes and configuring different energy delivery priorities, the energy management system can reasonably allocate and utilize energy according to the target operating mode (self-consumption mode or grid-connection priority mode), thereby achieving the effect of balancing the energy flow in the hybrid parallel system, reducing voltage fluctuations and frequency deviations, providing a more stable power supply, and further improving the stability and reliability of the hybrid parallel system, enhancing the user experience, and achieving the goal of maximizing the utilization of photovoltaic electric energy, reducing dependence on the power grid, and improving energy utilization efficiency.

[0085] In some of these embodiments, when the target operating mode is the self-consumption mode or the grid-connection priority mode, the above method further includes: obtaining a grid-connection power threshold, generating intermediate given values of the output powers corresponding to the grid-connection inverter and the energy storage inverter respectively according to the energy output priorities indicated by the self-consumption mode or the grid-connection priority mode, the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating powers of the various devices, and sending the corresponding intermediate given values of the output powers to the corresponding grid-connection inverter and energy storage inverter respectively, so that the grid-connection inverter and the energy storage inverter adjust the actual values of the corresponding output powers according to the intermediate given values of the output powers; at the next set moment, obtain again the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating powers of the various devices at the set moment, and generate the given values of the output powers corresponding to the grid-connection inverter and the energy storage inverter respectively in combination with the energy output priorities indicated by the self-consumption mode or the grid-connection priority mode.

[0086] By re-obtaining the power required by the load, the power of the grid-connection electricity meter, the grid-connection power threshold, and the operating powers of the various devices at each set moment and generating new given values of the output powers based on these data, the energy management system realizes the dynamic adjustment of the output powers of the grid-connection inverter and the energy storage inverter, improves the real-time response ability of the hybrid parallel system, enhances the flexibility and adaptability of the hybrid parallel system, and thus achieves a better control effect and a preset operating effect.

[0087] In some of these embodiments, when the target operating mode is the energy storage priority mode, the energy delivery priorities of the inverter hybrid parallel system are the load and the power grid in sequence, and in the energy storage priority mode, the energy storage battery corresponding to the energy storage inverter does not perform a discharge operation; based on the energy output priorities indicated by the energy storage priority mode, the operating powers of the various devices in the inverter hybrid parallel system obtained by the energy management system include the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charging power of the energy storage battery, and the maximum charging power of the energy storage battery at the current moment.

[0088] In the energy storage priority mode, since there is no need to consider the discharge operation of the energy storage battery, the current discharge power and the maximum discharge power of the energy storage battery do not need to be obtained; only when the demand for load power consumption and the grid connection power limit are met, the corresponding output power setpoint can be generated.

[0089] The adjustment module 603 is configured to send the grid-connected inverter output power setpoint to the grid-connected inverter and send the energy storage inverter output power setpoint to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective actual output powers according to the corresponding output power setpoints.

[0090] By sending the output power setpoints of the grid-connected inverter and the energy storage inverter to the corresponding inverters through the energy management system, it is ensured that each inverter can adjust its actual output power according to accurate power commands, which improves the output power control accuracy of the inverter and enables the hybrid parallel system to more accurately meet the requirements of the target operating mode.

[0091] In some of these embodiments, the above adjustment module 603 is further configured to: if the energy storage inverter output power setpoint is less than the actual output power of the energy storage inverter, and / or the grid-connected inverter output power setpoint is less than the actual output power of the grid-connected inverter, then control the corresponding photovoltaic module through the inverter to reduce the output power of the photovoltaic module, so as to adjust the actual output power of the inverter to the corresponding output power setpoint; if the energy storage inverter output power setpoint is greater than the actual output power of the energy storage inverter, then control the corresponding photovoltaic module through the energy storage inverter to increase the output power of the photovoltaic module and / or control the energy storage battery to discharge; if the grid-connected inverter output power setpoint is greater than the actual output power of the grid-connected inverter, then control the corresponding photovoltaic module through the grid-connected inverter to increase the output power of the photovoltaic module and / or reduce the grid connection power; so as to adjust the actual output power of the corresponding inverter to a value closest to the corresponding output power setpoint.

[0092] By comparing the output power reference value with the actual value in real time, the hybrid parallel system can precisely adjust the energy flow among the photovoltaic modules, energy storage batteries, and the power grid, making the power output of the hybrid parallel system highly consistent with the target operation mode and improving the control accuracy of the hybrid parallel system.

[0093] The control device of the inverter hybrid parallel system provided by the embodiments of the present invention obtains the target operation mode of the inverter hybrid parallel system through the target operation mode acquisition module, wherein the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, both the grid-connected inverter and the energy storage inverter are used to connect the photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus; the output power reference value generation module respectively obtains the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system based on the target operation mode, and generates the grid-connected inverter output power reference value and the energy storage inverter output power reference value according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; the adjustment module sends the grid-connected inverter output power reference value to the grid-connected inverter and sends the energy storage inverter output power reference value to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust the actual output power values of themselves according to the corresponding output power reference values. It overcomes the problems in the related art that it is difficult to achieve system-level operation mode control for the inverter hybrid parallel system including energy storage inverters and grid-connected inverters, the output power control effect of the inverter is poor, the user experience is poor, which limits the enthusiasm of users to purchase additional photovoltaic systems and restricts the development of the photovoltaic industry. By adding an energy management system to communicate with each device in the inverter hybrid parallel system, it realizes the given control of the output power of the energy storage inverter and the grid-connected inverter via the energy management system, achieves the operating effect corresponding to the system-level operation mode, improves the user experience, and expands the technical effect of the popularization and application of the inverter hybrid parallel system.

[0094] An embodiment of the present invention further provides a photovoltaic inverter system, which includes an energy management system and an inverter hybrid parallel system; wherein, the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter. Both the grid-connected inverter and the energy storage inverter are used to connect to photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on the AC bus; the energy management system is communicatively connected to each device in the inverter hybrid parallel system, and is used to obtain the target operation mode of the inverter hybrid parallel system, obtain the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device in the inverter hybrid parallel system, and generate a given value of the output power of the grid-connected inverter and a given value of the output power of the energy storage inverter according to the target operation mode, the power required by the load, the power of the grid-connected electricity meter, and the operating power of each device; and send the given value of the output power of the grid-connected inverter to the grid-connected inverter, and send the given value of the output power of the energy storage inverter to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust the actual value of their respective output powers according to the corresponding given values of the output powers.

[0095] An embodiment of the present invention further provides a non-transitory machine-readable medium storing a computer program, wherein the above computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present invention.

[0096] An embodiment of the present invention further provides a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present invention. Among them, the computer program product should be understood as a software product that mainly realizes the above method of the present application through the computer program.

[0097] An embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor. The above memory stores a computer program that can be executed by the at least one processor, and the above computer program, when executed by the at least one processor, is used to cause the electronic device to execute the method of the embodiment of the present invention.

[0098] Reference Figure 7, a block diagram of an electronic device such as a server or a client that can be an embodiment of the present invention will now be described. It is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0099] As Figure 7 shown, the electronic device includes a computing unit 701, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 702 or a computer program loaded from a storage unit 708 into a random access memory (RAM) 703. In the RAM 703, various programs and data required for the operation of the electronic device can also be stored. The computing unit 701, the ROM 702, and the RAM 703 are connected to each other via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0100] Multiple components in the electronic device are connected to the I / O interface 705, including: an input unit 706, an output unit 707, a storage unit 708, and a communication unit 709. The input unit 706 can be any type of device that can input information into the electronic device. The input unit 706 can receive input digital or character information, and generate key signal inputs related to the user settings and / or function controls of the electronic device. The output unit 707 can be any type of device that can present information, and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 708 can include, but is not limited to, magnetic disks, optical disks. The communication unit 709 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0101] The computing unit 701 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 701 include, but are not limited to, a CPU, a graphics processing unit (GPU), various special artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 701 executes the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention can be implemented as a computer program tangibly embodied in a machine-readable medium, such as the storage unit 708. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device via the ROM 702 and / or the communication unit 709. In some embodiments, the computing unit 701 can be configured to execute the above-described methods in any other suitable manner (e.g., by means of firmware).

[0102] The computer program for implementing the method of the embodiments of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer programs are executed by the processor or controller, the functions / operations specified in the flowchart and / or block diagram are implemented. The computer program can be executed entirely on the machine, partially on the machine, as an independent software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0103] In the context of the embodiments of the present invention, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, or infrared system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0104] It should be noted that the term "including" and its variants used in the embodiments of the present invention are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless clearly specified otherwise in the context, it should be understood as "one or more".

[0105] The information (including but not limited to device information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data that have been authorized by the user or fully authorized by all parties. And the collection, use, and processing of the relevant data need to comply with the relevant laws, regulations, and standards of the relevant countries and regions, and corresponding operation entrances are provided for the user to choose to authorize or refuse.

[0106] The various steps described in the method implementation manners provided by the embodiments of the present invention can be executed in different orders and / or executed in parallel. In addition, the method implementation manners may include additional steps and / or omit the steps shown. The protection scope of the present invention is not limited in this regard.

[0107] The term "embodiment" in this specification means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referred to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiments.

[0108] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A control method for a hybrid parallel inverter system, characterized in that: include: Acquiring a target operation mode of the hybrid parallel inverter system based on the energy management system; wherein the hybrid parallel inverter system includes at least one grid-connected inverter and at least one energy storage inverter, the grid-connected inverter and the energy storage inverter are both used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on an AC bus; Based on the target operation mode, the energy management system obtains the power required by the load, the grid-connected meter power and the operating power of each device in the inverter hybrid parallel system, and generates a grid-connected inverter output power given value and an energy storage inverter output power given value according to the target operation mode, the power required by the load, the grid-connected meter power and the operating power of each device; The grid-connected inverter output power given value is sent to the grid-connected inverter through the energy management system, and the energy storage inverter output power given value is sent to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective output power actual values ​​according to the corresponding output power given values; wherein the step of adjusting the grid-connected inverter and the energy storage inverter to their respective output power actual values ​​according to the corresponding output power given values ​​includes: If the output power setting value of the energy storage inverter is less than the actual output power value of the energy storage inverter, and / or the output power setting value of the grid-connected inverter is less than the actual output power value of the grid-connected inverter, the inverter controls the corresponding photovoltaic module to reduce the output power of the photovoltaic module, so as to adjust the actual output power value of the inverter to the corresponding output power setting value; If the output power given value of the energy storage inverter is greater than the actual output power value of the energy storage inverter, the energy storage inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or control the discharge of the energy storage battery; if the output power given value of the grid-connected inverter is greater than the actual output power value of the grid-connected inverter, the grid-connected inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or reduce the grid-connected power; so as to adjust the actual output power value of the corresponding inverter to a value closest to the corresponding output power given value.

2. The method according to claim 1, characterized in that Before the step of sending the grid-connected inverter output power set value to the grid-connected inverter through the energy management system, the method further includes: The grid-connected power threshold is obtained through the energy management system, and after the grid-connected inverter output power given value is generated, it is determined whether the grid-connected inverter output power given value is greater than the grid-connected power threshold; if so, the grid-connected power threshold is used as the updated grid-connected inverter output power given value.

3. The method according to claim 1, characterized in that When the target operation mode is the self-generation and self-use mode, the energy transmission priorities of the inverter hybrid parallel system are load, energy storage battery and power grid in sequence; when the target operation mode is the grid-connected priority mode, the energy transmission priorities of the inverter hybrid parallel system are load, power grid and energy storage battery in sequence; wherein, based on the energy output priority indicated by the self-generation and self-use mode or the grid-connected priority mode, the operating power of each device in the inverter hybrid parallel system obtained by the energy management system includes: the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charge and discharge power of the energy storage battery and the maximum charge and discharge power of the energy storage battery.

4. The method according to claim 3, characterized in that When the target operation mode is the self-generation and self-use mode or the grid-connection priority mode, the method further includes: Obtaining a grid-connected power threshold, generating output power intermediate given values ​​corresponding to the grid-connected inverter and the energy storage inverter respectively according to the energy output priority indicated by the self-generation and self-use mode or the grid-connected priority mode, the power required by the load, the grid-connected electric meter power, the grid-connected power threshold and the operating power of each device, and sending the corresponding output power intermediate given values ​​to the corresponding grid-connected inverter and energy storage inverter respectively, so that the grid-connected inverter and the energy storage inverter adjust the corresponding output power actual values ​​according to the output power intermediate given values; At the next set time, the load required power, grid-connected meter power, grid-connected power threshold and operating power of each device at the set time are obtained again, and the output power set values ​​corresponding to the grid-connected inverter and the energy storage inverter are generated respectively in combination with the energy output priority indicated by the self-generation and self-use mode or the grid-connected priority mode.

5. The method according to claim 3, characterized in that: When the target operation mode is the energy storage priority mode, the energy transmission priority of the inverter hybrid parallel system is load and grid in sequence, and in the energy storage priority mode, the energy storage battery corresponding to the energy storage inverter does not perform a discharge operation; Based on the energy output priority indicated by the energy storage priority mode, the operating power of each device in the inverter hybrid parallel system obtained by the energy management system includes the output power of the energy storage inverter, the output power of the grid-connected inverter, the output power of the photovoltaic module, the maximum output power of the photovoltaic module, the SOC of the energy storage battery, the charging power of the energy storage battery and the maximum charging power of the energy storage battery.

6. The method according to claim 1, characterized in that The inverter hybrid parallel system includes an energy storage inverter system composed of a plurality of the energy storage inverters and a grid-connected inverter system composed of a plurality of the grid-connected inverters, and the method further includes: Based on the energy management system, the grid-connected inverter output power set value is sent to the grid-connected inverter system, so that the grid-connected inverter system adjusts the output power actual value of each of the grid-connected inverters according to the grid-connected inverter output power set value; based on the energy management system, the energy storage inverter output power set value is sent to the energy storage inverter system, so that the energy storage inverter system adjusts the output power actual value of each of the energy storage inverters according to the energy storage inverter output power set value.

7. A control device for a hybrid parallel inverter system, characterized in that: Set in an energy management system, the device includes: A target operation mode acquisition module, used to acquire a target operation mode of an inverter hybrid parallel system; wherein the inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, the grid-connected inverter and the energy storage inverter are both used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on an AC bus; An output power set value generation module is used to obtain the load required power, the grid-connected meter power and the operating power of each device in the inverter hybrid parallel system based on the target operation mode, and generate a grid-connected inverter output power set value and an energy storage inverter output power set value according to the target operation mode, the load required power, the grid-connected meter power and the operating power of each device; An adjustment module is used to send the grid-connected inverter output power set value to the grid-connected inverter, and send the energy storage inverter output power set value to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective output power actual values ​​according to the corresponding output power set values; wherein the adjustment module is also used to: If the output power setting value of the energy storage inverter is less than the actual output power value of the energy storage inverter, and / or the output power setting value of the grid-connected inverter is less than the actual output power value of the grid-connected inverter, the inverter controls the corresponding photovoltaic module to reduce the output power of the photovoltaic module, so as to adjust the actual output power value of the inverter to the corresponding output power setting value; If the output power given value of the energy storage inverter is greater than the actual output power value of the energy storage inverter, the energy storage inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or control the discharge of the energy storage battery; if the output power given value of the grid-connected inverter is greater than the actual output power value of the grid-connected inverter, the grid-connected inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or reduce the grid-connected power; so as to adjust the actual output power value of the corresponding inverter to a value closest to the corresponding output power given value.

8. The device according to claim 7, characterized in that The device also includes a grid-connected power limiting module, which is used to obtain a grid-connected power threshold and, after generating the grid-connected inverter output power given value, determine whether the grid-connected inverter output power given value is greater than the grid-connected power threshold; if so, use the grid-connected power threshold as the updated grid-connected inverter output power given value.

9. A photovoltaic inverter system, characterized in that: The system includes an energy management system and an inverter hybrid parallel system; wherein, The inverter hybrid parallel system includes at least one grid-connected inverter and at least one energy storage inverter, wherein the grid-connected inverter and the energy storage inverter are both used to connect photovoltaic modules, and the grid-connected inverter and the energy storage inverter are arranged in parallel on an AC busbar; The energy management system is communicatively connected with each device in the inverter hybrid parallel system, and is used to obtain the target operation mode of the inverter hybrid parallel system, obtain the load required power, the grid-connected meter power and the operating power of each device in the inverter hybrid parallel system, and generate a grid-connected inverter output power given value and an energy storage inverter output power given value according to the target operation mode, the load required power, the grid-connected meter power and the operating power of each device; and send the grid-connected inverter output power given value to the grid-connected inverter, and send the energy storage inverter output power given value to the energy storage inverter, so that the grid-connected inverter and the energy storage inverter adjust their respective output power actual values ​​according to the corresponding output power given values; wherein the step of adjusting the grid-connected inverter and the energy storage inverter to their respective output power actual values ​​according to the corresponding output power given values ​​includes: If the output power setting value of the energy storage inverter is less than the actual output power value of the energy storage inverter, and / or the output power setting value of the grid-connected inverter is less than the actual output power value of the grid-connected inverter, the inverter controls the corresponding photovoltaic module to reduce the output power of the photovoltaic module, so as to adjust the actual output power value of the inverter to the corresponding output power setting value; If the output power given value of the energy storage inverter is greater than the actual output power value of the energy storage inverter, the energy storage inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or control the discharge of the energy storage battery; if the output power given value of the grid-connected inverter is greater than the actual output power value of the grid-connected inverter, the grid-connected inverter is used to control the corresponding photovoltaic components to increase the output power of the photovoltaic components and / or reduce the grid-connected power; so as to adjust the actual output power value of the corresponding inverter to a value closest to the corresponding output power given value.

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