Start-up methods and parallel power generation systems

Abstract

This application discloses a startup method and a parallel power generation system, belonging to the field of power technology. The startup method for the parallel power generation system includes: when at least one subsystem receives a local start-up command, controlling the AC-side relays connected to the AC ports of each subsystem to remain in an open state; the AC ports are used to connect loads; and when the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy, controlling at least some subsystems in the multiple parallel subsystems to start synchronously. The startup method for the parallel power generation system of this application can achieve synchronous startup and load bearing of the parallel system without adjusting the load power, extending equipment life, effectively ensuring the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

Description

Technical Field

[0001] This application belongs to the field of power technology, and in particular relates to a starting method for a parallel power generation system and a parallel power generation system. Background Technology

[0002] To better cover different power levels in various application scenarios, modular photovoltaic-storage power generation systems operate in parallel. In related technologies, modular parallel power generation systems are configured with a total load of equivalent power according to derating design. This total load is generally greater than the power of a single power generation unit in the parallel system. When the system starts up off-grid, if the multiple parallel power generation units start asynchronously, the first power generation unit to start may shut down due to overcurrent because the total load exceeds the power of the power generation unit. This causes the individual power generation unit to repeatedly restart due to overcurrent, impacting the power generation equipment and reducing its lifespan. In addition, the cycle of load startup failures may also damage motor-type equipment. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a starting method and a parallel power generation system, which can achieve synchronous starting and load-bearing of the parallel system without adjusting the load power, extend equipment life, effectively ensure the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0004] In a first aspect, this application provides a method for starting a parallel power generation system, the parallel power generation system comprising multiple parallel subsystems; the method includes: When at least one subsystem receives a local enable command, the AC-side relays connected to the AC ports of each subsystem are kept in an open state; the AC ports are used to connect loads. If the target subsystem in at least one of the multiple parallel subsystems determines that the startup conditions are met based on a delay strategy, then at least some of the subsystems in the multiple parallel subsystems are controlled to start synchronously.

[0005] According to the starting method of the parallel power generation system of this application, after receiving the local start command, the target subsystem is selected to execute a delay strategy to control other subsystems to start AC output synchronously when the start conditions are met based on the delay strategy. The synchronous start-up of the parallel system can be achieved without adjusting the load power, which extends the equipment life, effectively ensures the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0006] According to one embodiment of this application, in the at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: The target subsystem monitors the reception status of other subsystems; the reception status is used to indicate whether the subsystem has received the local enable command. If a new subsystem receives the local enable command within the first time period, the monitoring time is reset and the monitoring of the reception status of other subsystems continues. If no new subsystem receives the local startup command within the first time period, the startup condition is determined to be met.

[0007] According to one embodiment of this application, in the at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: If the delay after the target subsystem receives the local start command is greater than the second duration, the start condition is determined to be met.

[0008] According to one embodiment of this application, the synchronous startup of at least some subsystems in the plurality of parallel subsystems includes: Control at least some of the subsystems to synchronously close the AC-side relays, and control at least some of the subsystems to synchronously output the same voltage command, the voltage command being used to control the amplitude and phase of each of the subsystems.

[0009] According to one embodiment of this application, the voltage command is further used to control the amplitude growth rate, the amplitude growth rate of each of the subsystems is kept consistent, and the amplitude growth rate is determined based on the grid connection standard parameters corresponding to the setting area of ​​the parallel power generation system.

[0010] According to one embodiment of this application, when the target subsystem in the at least one subsystem determines that the startup conditions are met based on a delay strategy, controlling at least some subsystems in the plurality of parallel subsystems to start synchronously includes: Based on the self-test information sent by each of the subsystems, the subsystems that are in a normal state are determined from the plurality of parallel subsystems; If the startup conditions are met based on the delay strategy, control each of the subsystems in normal state to start synchronously.

[0011] According to one embodiment of this application, before controlling at least some subsystems in the plurality of parallel subsystems to start synchronously when the target subsystem in the at least one subsystem determines that the startup conditions are met based on a delay strategy, the method includes: When the target subsystem receives the local activation command, it controls the energy storage device inside the target subsystem to establish a high voltage at the battery port. The high voltage is used to start the auxiliary power device inside the target subsystem, which is used to supply power to the communication device inside the target subsystem. The communication device is used to execute the delay strategy.

[0012] Secondly, this application provides a starting device for a parallel power generation system, the parallel power generation system comprising multiple parallel subsystems; the device includes: The first processing module is configured to control the AC-side relays connected to the AC port of each subsystem to remain in an open state when at least one subsystem receives a local start command; the AC port is used to connect a load. The second processing module is used to control at least some of the parallel subsystems to start synchronously when the target subsystem in the at least one subsystem determines that the startup conditions are met based on a delay strategy.

[0013] According to the starting device of the parallel power generation system of this application, after receiving the local start command, the target subsystem is selected to execute a delay strategy to control other subsystems to start AC output synchronously when the start conditions are met based on the delay strategy. The synchronous start-up of the parallel system can be achieved without adjusting the load power, which extends the equipment life, effectively ensures the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0014] Thirdly, this application provides a parallel power generation system, including: Multiple subsystems connected in parallel; The parallel power generation system operates based on the startup method of the parallel power generation system as described in the first aspect.

[0015] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: After receiving a local start command, the system selects the target subsystem to execute a delay strategy. Based on the delay strategy, it determines that the start conditions are met and controls other subsystems to start their AC output synchronously. This allows for synchronous start-up and load-bearing of parallel systems without adjusting the load power, extending equipment lifespan, effectively ensuring the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0016] Furthermore, by controlling the subsystem to output voltages of the same amplitude and phase synchronously, the power supply device can be started synchronously, thereby enabling the parallel system to carry load synchronously.

[0017] Furthermore, upon receiving a local start command, instead of starting the system directly, the target subsystem is selected as the host to start the Pack+BCU to establish a high-voltage bus for external communication and to execute a delay strategy. Based on the delay strategy, other subsystems are controlled to start synchronously with AC output when the start conditions are met. This enables synchronous start-up and load carrying of the parallel system, reducing the adverse effects caused by overcurrent in the power generation unit and multiple load start failures, as well as the increased maintenance costs caused by manual load switching, and extending equipment life.

[0018] Furthermore, by setting multiple delay strategies, a matching delay strategy can be selected based on the actual situation, which has a high degree of flexibility; and it can realize the synchronous start-up of multiple parallel subsystems, reduce the frequency of continuous overcurrent restarts of a single subsystem, reduce the impact on the subsystem, and extend the equipment life.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the flowcharts illustrating the startup method of the parallel power generation system provided in the embodiments of this application; Figure 2 This is a second schematic flowchart of the starting method for the parallel power generation system provided in the embodiments of this application; Figure 3 This is the third flowchart illustrating the startup method of the parallel power generation system provided in the embodiments of this application; Figure 4 This is one of the structural schematic diagrams of the parallel power generation system provided in the embodiments of this application; Figure 5 This is the second schematic diagram of the parallel power generation system provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the starting device of the parallel power generation system provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] The starting method, starting device, electronic equipment, and readable storage medium of the parallel power generation system provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0024] The startup method of the parallel power generation system in this application can be used in multi-unit parallel scenarios as well as off-grid startup scenarios.

[0025] like Figure 1 As shown, the startup method of the parallel power generation system includes steps 110 and 120.

[0026] Step 110: When at least one subsystem receives a local enable command, control the AC side relays connected to the AC port of each subsystem to remain in the off state; In this step, the AC port is used to connect the load.

[0027] like Figure 5 As shown, the parallel power generation system includes multiple parallel subsystems, and communication connections can be established between the subsystems.

[0028] Each subsystem includes an inverter and an energy storage device. The inverter includes a first microcontroller, a DC-AC converter, and an AC-side relay; the energy storage device includes a second microcontroller, a switching control, and at least one battery pack.

[0029] Each energy storage device includes a battery control unit (BCU) and at least one battery pack. Each battery pack is equipped with a battery management system (BMS), and the BCU is electrically connected to each BMS.

[0030] The inverters in each subsystem can establish communication connections; the energy storage device is connected to the inverter; the first microcontroller can establish communication connections with the energy storage device and the first microcontrollers in other subsystems; the DC-AC converter is connected to the energy storage device via the battery port.

[0031] The switch control is connected to the second microcontroller to receive local start-up commands; the battery pack is connected to the inverter.

[0032] The local start command is a local command used to instruct the startup subsystem to establish a normal communication connection. It can be triggered by a switch control, such as when a user presses the switch control, triggering the generation of the local start command. It should be noted that in this application, after receiving the local start command, the subsystem first starts the auxiliary power source to provide power for communication in order to establish a communication connection, and does not need to start immediately.

[0033] The switch control can be located on the housing of the energy storage device, such as a start button; or it can be a virtual control, which is not limited here.

[0034] like Figure 4 As shown, in some embodiments, the subsystem may further include: a maximum power point tracking device disposed between the photovoltaic port and the DC-AC converter, wherein the photovoltaic port is used to connect photovoltaic modules.

[0035] Step 120: If the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy, control at least some subsystems in multiple parallel subsystems to start synchronously.

[0036] In this step, the target subsystem can be the first subsystem among at least one subsystem to receive the local enable command; in other embodiments, the target subsystem can also be a subsystem randomly selected by each subsystem that receives the local enable command, or it can be specified by the user, which is not limited here.

[0037] In some embodiments, the target subsystem may serve as the main control system for each subsystem.

[0038] At least some subsystems can be one, several or all of the subsystems connected in parallel, and the specific number can be based on user-defined settings; or can be selected based on the state of charge of the energy storage devices of each subsystem; or can be selected randomly; or can other selection methods be used, which are not limited here.

[0039] The start-up conditions can be based on user-defined settings, such as a certain delay duration, a certain number of connected subsystems meeting a certain threshold, or the total output voltage of all connected subsystems being greater than or equal to the load requirement.

[0040] The delay strategy is used to execute a delayed response, that is, to start the system after a certain delay following the receipt of the local start command, rather than starting it immediately. The delay strategy can be based on user-defined settings, as long as it ensures that the output voltage of each subsystem used to control synchronous startup can meet the current load requirements, given that the startup conditions are determined to be met based on the delay strategy.

[0041] In some embodiments, controlling the synchronous startup of at least some subsystems in a plurality of parallel subsystems includes: Control at least some subsystems to synchronously close AC side relays and control at least some subsystems to synchronously output the same voltage command, the voltage command being used to control the amplitude and phase of each subsystem.

[0042] In this embodiment, voltage commands are used to control each subsystem to output the same voltage amplitude and voltage phase.

[0043] In some embodiments, the voltage command is also used to control the amplitude growth rate, with the amplitude growth rate of each subsystem remaining consistent. The amplitude growth rate is determined based on the grid connection standard parameters corresponding to the setting area of ​​the parallel power generation system.

[0044] In this embodiment, the grid connection standard parameters vary depending on the setting area; for example, the grid connection standard parameters may differ between domestic and foreign countries.

[0045] The voltage amplitude growth rate can be a fixed value or a dynamically changing value, as long as the voltage amplitude growth rate of each subsystem is the same and meets the grid connection standard parameters. By controlling the output voltage amplitude of the subsystem to gradually increase, and keeping the amplitude growth rate of each started subsystem synchronized, the synchronization of the output voltage of each subsystem can be further improved, realizing synchronous load carrying of the parallel system.

[0046] During synchronous startup, different subsystems have completed self-checks and reported their fault information and state of charge to the target subsystem. The target subsystem determines the number of subsystems that can start normally based on the communication information. The target subsystem first issues a command to all subsystems to close their AC output relays, then synchronizes the voltage reference values ​​and phases of all subsystems, and instructs all target subsystems to start synchronously with the same amplitude and phase. During synchronous startup, the amplitude of the voltage command gradually increases, and the rate of increase can be set.

[0047] According to the starting method of the parallel power generation system provided in the embodiments of this application, by controlling the subsystem to synchronously output voltages with the same amplitude and phase, the synchronous starting of the power supply device can be realized, thereby realizing the synchronous load carrying of the parallel system.

[0048] In some embodiments, before controlling at least some subsystems in multiple parallel subsystems to start synchronously, if the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy, the method includes: When the target subsystem receives a local start command, it controls the energy storage device inside the target subsystem to establish a high voltage at the battery port. The high voltage is used to start the auxiliary power device inside the target subsystem. The auxiliary power device is used to power the communication device inside the target subsystem, thereby enabling communication with external devices. The communication device is used to execute the delay strategy.

[0049] In this embodiment, when the target subsystem receives a local start command, it first activates the Pack+BCU to establish a high-voltage bus, without directly outputting AC power, such as... Figure 4 As shown, taking the target subsystem as the subsystem corresponding to BCU1 as an example, the target subsystem supplies low-voltage auxiliary power (e.g., 12V / 24V) to BCU1. BCU1 starts self-testing and establishes communication with each BMU in Pack1-1 to Pack1-n, collecting data such as voltage, temperature, and state of charge of all cells. Based on the collected data, it performs self-testing to confirm whether the status of the cells in each battery pack is normal, including but not limited to self-testing for overvoltage, undervoltage, overtemperature, insulation faults, etc. If it is determined that all battery packs are normal, it controls the main contactor / relay in the Pack to close. At this time, the DC high voltage of the battery pack (e.g., 200V-1000V DC) is output to the DC input terminal of the power conversion system (PCS), realizing the establishment of the high-voltage bus. After the high-voltage bus is established, the power conversion system is in a ready but waiting state. It will not immediately start DC / AC conversion, but instead starts communication with other subsystems and executes a delay strategy.

[0050] When the target subsystem determines that the start-up conditions are met based on the delay strategy, the AC side relay is closed, the DC / AC is turned on, and at least some of the multiple parallel subsystems are controlled to start synchronously. At this time, each subsystem outputs AC power to the AC port.

[0051] Continue with Figure 4 The following explanation uses a parallel system as an example. When the operator presses the start button for BCU1, BCU2, ..., BCUm, the subsystem corresponding to BCU1 becomes the target subsystem. The energy storage device of BCU1 first starts the auxiliary power source and external communication. After establishing communication connections with other subsystems, it can send information to the communication devices of other subsystems and receive information sent by other subsystems. MCU1-1 can act as the master of the entire parallel power generation system, starting to detect the number of connected slaves (i.e., the number of other subsystems that have established communication connections with the target subsystem) and performing a certain waiting delay.

[0052] According to the startup method of the parallel power generation system provided in the embodiments of this application, after receiving the local startup command, instead of starting directly, the target subsystem is selected as the host to start the Pack+BCU to establish a high-voltage bus for external communication and to execute a delay strategy. Based on the delay strategy, when the startup conditions are met, other subsystems are controlled to start synchronously to output AC power. This achieves synchronous startup and load carrying of the parallel system, reduces the adverse effects caused by overcurrent of the power generation device and multiple startup failures of the load, and increases the maintenance costs caused by manual load switching, thereby extending the equipment life.

[0053] In some embodiments, when the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy, controlling at least some subsystems in multiple parallel subsystems to start synchronously includes: Based on the self-test information sent by each subsystem, the subsystem in normal condition is determined from multiple parallel subsystems; Based on a delay strategy, if the startup conditions are met, control the synchronous startup of all subsystems that are in normal condition.

[0054] In this embodiment, the self-test information may include, but is not limited to, fault information and state of charge of each subsystem. The fault information is used to characterize whether the energy storage device of the subsystem has malfunctioned. In some embodiments, the fault information may also include the fault category and the identification information of the faulty battery pack. Fault categories include, but are not limited to, overvoltage, undervoltage, overtemperature, and insulation faults. In actual implementation, each subsystem can perform self-tests independently and send its self-test information to the target subsystem after establishing communication with it.

[0055] A subsystem in normal condition is a subsystem that has not experienced a failure.

[0056] The target subsystem selects the subsystems that have not experienced any faults based on the received self-test information, and controls the non-faulty subsystems to start synchronously when the startup conditions are met based on the delay strategy.

[0057] The non-faulty subsystems can include any one or more of the target subsystem and other subsystems that are in a normal state.

[0058] According to the startup method of the parallel power generation system provided in the embodiments of this application, the host determines the subsystem in normal state through the self-test information of each subsystem, so as to control the subsystem in normal state to start synchronously to supply power to the load after meeting the delay time. This not only reduces the frequency of continuous overcurrent restart of a single subsystem, but also effectively ensures the stability of the parallel system operation.

[0059] During the research and development process, the inventors discovered that in related technologies, when a system starts up off-grid, the startup of multiple parallel generators is often asynchronous. The generator that starts first may shut down due to overcurrent because the total load exceeds its power capacity, causing individual generators to repeatedly restart due to overcurrent, impacting the power generation equipment and shortening its lifespan. The cycle of failed load startups can also damage motor-type equipment. To address these issues, another method in related technologies requires users to check the system load configuration and, during startup, have the operator ditch most of the load so that the load at startup is less than the maximum startup power of any single generator, allowing any generator to start normally. After all generators have started, the remaining load is then put back on. However, this method not only wastes manpower and resources and increases system maintenance costs, but also requires reducing load power, affecting the load's power demand.

[0060] In this application, after receiving a local start command, the target subsystem is selected to execute a delay strategy instead of starting directly. If the start conditions are met based on the delay strategy, and multiple subsystems are connected or their output voltage can meet the load requirements, the other subsystems are controlled to start AC output synchronously. This achieves synchronous start-up and load bearing of the parallel system, reduces the adverse effects caused by overcurrent of the generator and multiple load start failures, and reduces the increased maintenance costs caused by manual load switching. It also extends the equipment lifespan, eliminates the need for manual operation, reduces labor costs and system operation and maintenance costs, and ensures the normal power demand of the load without adjusting the load power.

[0061] According to the parallel power generation system startup method provided in the embodiments of this application, after receiving the local startup command, the target subsystem is selected to execute a delay strategy to control other subsystems to start AC output synchronously when the startup conditions are met based on the delay strategy. The synchronous startup and load-bearing of the parallel system can be achieved without adjusting the load power, which extends the equipment life, effectively ensures the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0062] The implementation method of the delay strategy will be explained below.

[0063] In some embodiments, in at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: The target subsystem monitors the reception status of other subsystems; If a new subsystem receives a local enable command within the first time period, the monitoring time is reset and the monitoring of the reception status of other subsystems continues. If no new subsystem receives a local start command within the first time period, the startup conditions are determined to be met.

[0064] In this embodiment, the receiving status is used to characterize whether the subsystem has received a local enable command to establish a communication connection.

[0065] The duration can be user-defined, such as set to Tref1, but this application does not impose any restrictions on it.

[0066] like Figure 2 As shown, in actual operation, when the operator presses the start button of BCU1, BCU2, ..., BCUm, the subsystem corresponding to BCU1, as the target subsystem, continuously monitors the receiving status of each subsystem. Establishing a communication connection with the corresponding subsystem means that the subsystem has been connected, i.e., it has received the local start command. The target subsystem sets Tref as a waiting threshold. If a new subsystem is detected to be connected within the first duration Tref1, such as when the subsystem corresponding to MCU2-1 establishes a communication connection, Tref is reset and the timer restarts, continuing to wait for the new parallel subsystem to connect. If the waiting time exceeds Tref1, the target subsystem coordinates the synchronous start of the parallel subsystems within the system. During synchronous start-up, different subsystems have completed self-tests and reported their fault information and charge status to the target subsystem. The target subsystem determines the number of subsystems that can start normally based on the communication information. MCU1-1 first issues a command to all normal subsystems to close the AC side relays, then synchronizes the voltage reference value and phase of the normal subsystems, and instructs each normal subsystem to start synchronously with the same amplitude and phase. During synchronous startup, the voltage command amplitude gradually increases, and the rate of amplitude increase can be set.

[0067] In some embodiments, in at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: If the delay after the target subsystem receives the local start command is greater than the second duration, the start condition is determined to be met.

[0068] In this embodiment, the second duration can be based on a user-defined setting, such as Tref2. In some embodiments, the second duration can be greater than the first duration.

[0069] like Figure 3As shown, when the operator presses the start buttons of BCU1, BCU2, ..., BCUm in sequence, the subsystem corresponding to BCU1 acts as the target subsystem, monitoring the reception status of each subsystem. The target subsystem sets Tref2 as a waiting threshold. During the Tref time, the target subsystem identifies the continuously connected subsystems; if the waiting time exceeds the second duration Tref2, the target subsystem coordinates the synchronous start-up of parallel subsystems within the system. During synchronous start-up, different subsystems have completed self-tests, reporting their fault information and state of charge to the target subsystem. The target subsystem determines the number of subsystems that can start normally based on the communication information. MCU1-1 first issues a command to all normal subsystems to close their AC-side relays, then synchronizes the voltage reference value and phase of all normal subsystems, and instructs each normal subsystem to start synchronously with the same amplitude and phase. During synchronous start-up, the amplitude of the voltage command gradually increases, and the rate of increase can be set.

[0070] According to the startup method of the parallel power generation system provided in the embodiments of this application, by setting multiple delay strategies, a matching delay strategy can be selected based on the actual situation, which has high flexibility; and it can realize the synchronous startup of multiple parallel subsystems, reduce the frequency of continuous overcurrent restart of a single subsystem, reduce the impact on the subsystem, and extend the equipment life.

[0071] The starting method for a parallel power generation system provided in this application can be executed by a starting device for the parallel power generation system. This application uses the starting device for the parallel power generation system executing the starting method as an example to illustrate the starting device for the parallel power generation system provided in this application.

[0072] This application also provides a starting device for a parallel power generation system.

[0073] A parallel power generation system consists of multiple parallel subsystems.

[0074] like Figure 6 As shown, the starting device of the parallel power generation system includes: a first processing module 610 and a second processing module 620.

[0075] The first processing module 610 is used to control the AC side relays connected to the AC port of each subsystem to remain in the off state when at least one subsystem receives a local start command; the AC port is used to connect a load. The second processing module 620 is used to control at least some subsystems in multiple parallel subsystems to start synchronously when the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy.

[0076] According to the starting device of the parallel power generation system provided in the embodiments of this application, after receiving the local start command, the target subsystem is selected to execute a delay strategy so as to control other subsystems to start AC output synchronously when the start conditions are met based on the delay strategy. The synchronous start-up of the parallel system can be achieved without adjusting the load power, which extends the equipment life, effectively ensures the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0077] In some embodiments, the second processing module 620 is configured to: The target subsystem monitors the reception status of other subsystems; the reception status is used to characterize whether the subsystem has received the local enable command. If a new subsystem receives a local enable command within the first time period, the monitoring time is reset and the monitoring of the reception status of other subsystems continues. If no new subsystem receives a local start command within the first time period, the startup conditions are determined to be met.

[0078] In some embodiments, the second processing module 620 is configured to: If the delay after the target subsystem receives the local start command is greater than the second duration, the start condition is determined to be met.

[0079] In some embodiments, the second processing module 620 is configured to: Control at least some subsystems to synchronously close AC side relays and control at least some subsystems to synchronously output the same voltage command, the voltage command being used to control the amplitude and phase of each subsystem.

[0080] In some embodiments, the second processing module 620 is configured to: Based on the self-test information sent by each subsystem, the subsystem in normal condition is determined from multiple parallel subsystems; Based on a delay strategy, if the startup conditions are met, control the synchronous startup of all subsystems that are in normal condition.

[0081] In some embodiments, the device further includes a third processing module for: If, in at least one subsystem, the target subsystem determines that the start-up conditions are met based on a delay strategy, before controlling at least some subsystems in multiple parallel subsystems to start synchronously, upon receiving a local start-up command, the target subsystem controls the energy storage device inside the target subsystem to establish a high voltage at the battery port. The high voltage is used to start the auxiliary power supply device inside the target subsystem, which is used to power the communication device inside the target subsystem. The communication device is used to execute the delay strategy.

[0082] The starting device for the parallel power generation system in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the specific devices.

[0083] The starting device for the parallel power generation system in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit the specific operating system used.

[0084] The starting device for the parallel power generation system provided in this application embodiment can achieve... Figures 1 to 3 The various processes implemented in the method implementation examples will not be described again here to avoid repetition.

[0085] This application provides a parallel power generation system.

[0086] like Figure 5 As shown, the parallel power generation system includes multiple parallel subsystems.

[0087] Each subsystem can establish a communication connection; the parallel power generation system operates based on the startup method of the parallel power generation system described in any of the above embodiments.

[0088] like Figure 5 As shown, in some embodiments, the subsystem includes an inverter and an energy storage device.

[0089] The inverters in each subsystem are connected for communication; the energy storage devices are connected to the inverters.

[0090] like Figure 5As shown, in some embodiments, the inverter includes: a first microcontroller, a DC-AC converter, and an AC-side relay.

[0091] In this embodiment, the first microcontroller is communicatively connected to the energy storage device and the first microcontroller in other subsystems; the DC-AC converter is connected to the energy storage device via the battery port; the AC-side relay is disposed between the DC-AC converter and the AC port, and the AC port is used to connect the load.

[0092] like Figure 5 As shown, in some embodiments, the energy storage device includes: a second microcontroller, a switching control, and at least one battery pack.

[0093] In this embodiment, the switch control is communicatively connected to the second microcontroller to receive local power-on commands; the battery pack is connected to the inverter.

[0094] like Figure 4 As shown, in some embodiments, the subsystem further includes a maximum power point tracking device (MPPT).

[0095] The maximum power point tracking device is located between the photovoltaic port and the DC-AC converter, and the photovoltaic port is used to connect the photovoltaic modules.

[0096] According to the parallel power generation system provided in the embodiments of this application, after receiving a local start command, the target subsystem is selected to execute a delay strategy to control other subsystems to start AC output synchronously when the start conditions are met based on the delay strategy. The synchronous start-up of the parallel system can be achieved without adjusting the load power, which extends the equipment life, effectively ensures the normal power demand of the load, and has a high degree of automation, effectively reducing labor costs and system operation and maintenance costs.

[0097] In some embodiments, such as Figure 7 As shown, this application embodiment also provides an electronic device 700, including a processor 701, a memory 702, and a computer program stored in the memory 702 and executable on the processor 701. When the program is executed by the processor 701, it implements the various processes of the above-described parallel power generation system startup method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0098] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0099] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described parallel power generation system startup method embodiment and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0100] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0101] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for starting a parallel power generation system.

[0102] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0103] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described parallel power generation system startup method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0104] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0105] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0106] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0107] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for starting a parallel power generation system, characterized in that, The parallel power generation system includes multiple parallel subsystems; the method includes: When at least one subsystem receives a local enable command, the AC-side relays connected to the AC ports of each subsystem are kept in an open state; the AC ports are used to connect loads. If the target subsystem in at least one of the multiple parallel subsystems determines that the startup conditions are met based on a delay strategy, then at least some of the subsystems in the multiple parallel subsystems are controlled to start synchronously.

2. The starting method of the parallel power generation system according to claim 1, characterized in that, In the at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: The target subsystem monitors the reception status of other subsystems; the reception status is used to indicate whether the subsystem has received the local enable command. If a new subsystem receives the local enable command within the first time period, the monitoring time is reset and the monitoring of the reception status of other subsystems continues. If no new subsystem receives the local startup command within the first time period, the startup condition is determined to be met.

3. The starting method of the parallel power generation system according to claim 1, characterized in that, In the at least one subsystem, the target subsystem determines that the startup conditions are met based on a delay strategy, including: If the delay after the target subsystem receives the local start command is greater than the second duration, the start condition is determined to be met.

4. The starting method of the parallel power generation system according to any one of claims 1-3, characterized in that, The synchronous startup of at least some of the multiple parallel subsystems includes: Control at least some of the subsystems to synchronously close the AC-side relays, and control at least some of the subsystems to synchronously output the same voltage command, the voltage command being used to control the amplitude and phase of each of the subsystems.

5. The starting method of the parallel power generation system according to claim 4, characterized in that, The voltage command is also used to control the amplitude growth rate, and the amplitude growth rate of each subsystem is kept consistent. The amplitude growth rate is determined based on the grid connection standard parameters corresponding to the setting area of ​​the parallel power generation system.

6. The starting method of the parallel power generation system according to any one of claims 1-3, characterized in that, When the target subsystem in at least one subsystem determines that the startup conditions are met based on a delay strategy, controlling at least some subsystems in the multiple parallel subsystems to start synchronously includes: Based on the self-test information sent by each of the subsystems, the subsystems that are in a normal state are determined from the plurality of parallel subsystems; If the startup conditions are met based on the delay strategy, control each of the subsystems in normal state to start synchronously.

7. The starting method of the parallel power generation system according to any one of claims 1-3, characterized in that, Before controlling at least some of the parallel subsystems to start synchronously, in the at least one subsystem where the target subsystem determines that the startup conditions are met based on a delay strategy, the method includes: When the target subsystem receives the local activation command, it controls the energy storage device inside the target subsystem to establish a high voltage at the battery port. The high voltage is used to start the auxiliary power device inside the target subsystem, which is used to supply power to the communication device inside the target subsystem. The communication device is used to execute the delay strategy.

8. A parallel power generation system, characterized in that, include: Multiple subsystems connected in parallel; The parallel power generation system operates based on the startup method of the parallel power generation system as described in any one of claims 1-7.

9. The parallel power generation system according to claim 8, characterized in that, The subsystem includes: Inverter device; An energy storage device is connected to the inverter device.

10. The parallel power generation system according to claim 9, characterized in that, The inverter device includes: First microcontroller; A DC-AC converter is connected to the energy storage device via a battery port; An AC-side relay is located between the DC-AC converter and the AC port, which is used to connect a load.

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