Hybrid energy storage inverter ATS control device

Abstract

The invention discloses a hybrid energy storage inverter ATS control device, relates to the technical field of energy storage converter power supply conversion, and particularly relates to improvement of a novel photovoltaic energy storage inverter ATS control device. The power grid input end and the generator input end are connected through the automatic change-over switch controller and monitor the voltage state, the inverter 485 communication interface and the intelligent load output interface are both connected to the automatic change-over switch controller, and the power supply end of the detection unit is connected to a power supply of the automatic change-over switch controller. And the inverter AC interface is connected to the inverter connecting end of the automatic change-over switch controller. The power supply switching process is smooth, instantaneous large current impact is avoided, and the problem of power supply impact possibly occurring in an existing system is solved; real-time monitoring is realized through an RS485 communication interface, and the operation stability of the system is improved; intelligent load management is realized, and the energy utilization efficiency is improved; long-time power supply interruption of the energy storage system is avoided, the energy utilization efficiency is improved, the service life of equipment is prolonged, the anti-interference capability and the adaptive capability of the energy storage system are enhanced, and the requirements of complex application scenes are met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage converter power supply conversion, and in particular to an improvement of a novel photovoltaic energy storage inverter ATS control device. Background Art

[0002] With the rapid development of the photovoltaic energy storage technology industry, the application of energy storage systems has gradually increased, and its application scenarios have become more and more complex and diverse, such as supporting grid-connected and off-grid operation, and being able to achieve smooth and seamless switching between grid-connected and off-grid, generator access, intelligent load switching and other functions; integrated charging and discharging design to achieve two-way energy flow between AC and DC systems, uninterrupted power supply at the load end, and maximized energy utilization. These requirements have put forward new requirements and challenges for current energy storage systems.

[0003] The main function of the current photovoltaic energy storage ATS (automatic transfer switch) products is dual power input, one is the grid, the other is a generator or other second power source. When the grid is not available, it automatically switches to generator mode or the second power source to keep the inverter load uninterrupted or continuously powered. However, there are certain usage problems. When the power supply fails, it switches to generator mode or the second power source, but such conversion does not have voltage sampling and phase tracking, resulting in grid detection failure or phase inconsistency, and there is a momentary large current, causing the system to crash or shut down, which will cause the energy storage system to be completely shut down or damaged, affecting the normal operation of the system, and the customer load is powered off, causing inconvenience and loss of benefits to work. In order to ensure the reliability of the energy storage system and enhance the stability of the client load, a new type of photovoltaic energy storage ATS device is developed that can quickly switch to the generator or other backup power source to ensure the continuity and stability of the load power supply. Summary of the invention

[0004] The purpose of the present invention is to provide a hybrid energy storage inverter ATS control device in view of the defects and shortcomings of the prior art, which solves the problems of voltage detection failure, phase inconsistency and load power failure in the switching process between the power grid and the generator in the existing energy storage system; it optimizes the power supply reliability and system stability by integrating the power grid input, generator input, inverter 485 communication input and intelligent load interface.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the hybrid energy storage inverter ATS control device includes: a power grid input terminal 1, a generator input terminal 2, an inverter 485 communication interface 3, an intelligent load output interface 4, an inverter AC interface 5, a detection unit power supply terminal 6, and an automatic transfer switch controller 7. The power grid input terminal 1 and the generator input terminal 2 are respectively connected through the automatic transfer switch controller 7 to monitor the voltage state, the inverter 485 communication interface 3 and the intelligent load output interface 4 are both connected to the automatic transfer switch controller 7, the detection unit power supply terminal 6 is connected to the power supply of the automatic transfer switch controller 7, and the inverter AC interface 5 is connected to the inverter connection terminal of the automatic transfer switch controller 7.

[0006] The control method of the hybrid energy storage inverter ATS control device is as follows: when the grid input terminal 1 detects that the grid is normal, the automatic transfer switch controller 7 outputs the power of the grid to power the energy storage inverter. When the grid is out of power or fails, the automatic transfer switch controller 7 supplies power to the smart load in off-grid mode through the smart load output interface 4; at the same time, the automatic transfer switch controller 7 detects the SOC information of the battery and sends it to the automatic transfer switch controller 7. When the battery SOC value is lower than the set value, the automatic transfer switch controller 7 will send a generator start signal to start the generator. When the automatic transfer switch controller 7 detects that the voltage and phase of the second power supply of the generator are normal, the automatic transfer switch controller 7 automatically switches to the second power supply of the generator to supply the smart load.

[0007] The hybrid energy storage inverter ATS control device obtains the battery status information of the energy storage inverter through the inverter 485 communication interface 3, and controls the start-up of the generator or the start-stop of the intelligent load according to the battery status information value.

[0008] The hybrid energy storage inverter ATS control device has a detection unit power supply terminal 6 connected to a DC 5V power supply circuit, which is used to maintain the working state of the automatic transfer switch controller 7 when both the power grid and the generator are not powered.

[0009] The hybrid energy storage inverter ATS control device has dual power supply modes, namely, a grid power supply mode and a generator power supply mode, and ensures the consistency of voltage and phase during switching.

[0010] The hybrid energy storage inverter ATS control device is equipped with an anti-reverse flow device on the generator input terminal 2 to avoid damage to the system caused by energy backflow.

[0011] The working principle of the present invention: the grid input is used to detect the grid voltage and supply power to the inverter; the generator input is used as a backup power supply to provide stable power supply when the grid is out of power. The inverter 485 communication interface can detect the battery status (SOC) in real time. When the grid is normal: the energy storage inverter and the load are powered by the grid. When the grid fails: the battery SOC is detected, and when it is higher than the set value, the inverter switches to off-grid mode; when the SOC is lower than the set value, the generator is started as a power source; after confirming that the generator voltage and phase are normal, it automatically switches to the generator for power supply and charges the battery at the same time; the intelligent load output can automatically adjust the load power supply strategy according to the battery SOC.

[0012] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: the power switching process is smooth, avoiding instantaneous large current shocks, and solving the power supply shock problem that may occur in the existing system; real-time monitoring is achieved through the RS485 communication interface to improve the system operation stability; the present invention realizes intelligent load management and improves energy utilization efficiency; avoids long-term power supply interruptions in the energy storage system, improves energy utilization efficiency and protects the life of the equipment, enhances the anti-interference ability and adaptability of the energy storage system, and meets the needs of complex application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a structural schematic block diagram of the hybrid energy storage inverter ATS control device in the present invention;

[0015] Figure 2 It is a schematic diagram of the working method of the hybrid energy storage inverter ATS control device in the present invention.

[0016] Explanation of the reference numerals: grid input terminal 1, generator input terminal 2, inverter 485 communication interface 3, intelligent load output interface 4, inverter AC interface 5, detection unit power supply terminal 6, automatic transfer switch controller 7. DETAILED DESCRIPTION

[0017] See also Figure 1-2As shown, the hybrid energy storage inverter ATS control device in this embodiment includes: a power grid input terminal 1, a generator input terminal 2, an inverter 485 communication interface 3, an intelligent load output interface 4, an inverter AC interface 5, a detection unit power supply terminal 6, and an automatic transfer switch controller 7. The power grid input terminal 1 and the generator input terminal 2 are respectively connected through the automatic transfer switch controller 7 to monitor the voltage state, the inverter 485 communication interface 3 and the intelligent load output interface 4 are both connected to the automatic transfer switch controller 7, the detection unit power supply terminal 6 is connected to the power supply of the automatic transfer switch controller 7, and the inverter AC interface 5 is connected to the inverter connection terminal of the automatic transfer switch controller 7.

[0018] The control method of the hybrid energy storage inverter ATS control device is as follows: when the grid input terminal 1 detects that the grid is normal, the automatic transfer switch controller 7 outputs the power of the grid to power the energy storage inverter. When the grid is out of power or fails, the automatic transfer switch controller 7 supplies power to the smart load in off-grid mode through the smart load output interface 4; at the same time, the automatic transfer switch controller 7 detects the SOC information of the battery and sends it to the automatic transfer switch controller 7. When the battery SOC value is lower than the set value, the automatic transfer switch controller 7 will send a generator start signal to start the generator. When the automatic transfer switch controller 7 detects that the voltage and phase of the second power supply of the generator are normal, the automatic transfer switch controller 7 automatically switches to the second power supply of the generator to supply the smart load.

[0019] In this embodiment:

[0020] Grid input: connected to the municipal power grid, with a supply voltage range of 220V~240V and a frequency of 50Hz. Generator input: a 3kW diesel generator is selected, equipped with an independent voltage sampling module and a phase tracking module. Energy storage inverter: a 10kW photovoltaic energy storage inverter is selected, supporting the RS485 communication interface, and the battery rated voltage is 48V. Intelligent load: including office equipment (computers, printers) and lighting systems, with a total power of 2kW. ATS control device: with an independent 5V power supply circuit, supporting multi-mode (grid-connected, off-grid) automatic switching.

[0021] Working process: When the power supply of the grid is normal, the grid directly supplies power to the load through the ATS device and charges the energy storage battery at the same time. When the grid fails: If the battery SOC is higher than 50%, the energy storage inverter switches to off-grid mode to supply power to the smart load. If the battery SOC is lower than 50%, the ATS starts the generator and switches to power supply after detecting that the generator voltage is normal. Main components selected Grid detection module: DEIF brand voltage sampler is selected. Generator module: YAMAHA EF3000iSE diesel generator. Energy storage battery: lithium iron phosphate battery with a capacity of 10kWh.

[0022] The hybrid energy storage inverter ATS control device obtains the battery status information of the energy storage inverter through the inverter 485 communication interface 3, and controls the start-up of the generator or the start-stop of the intelligent load according to the battery status information value.

[0023] The hybrid energy storage inverter ATS control device has a detection unit power supply terminal 6 connected to a DC 5V power supply circuit, which is used to maintain the working state of the automatic transfer switch controller 7 when both the power grid and the generator are not powered.

[0024] The hybrid energy storage inverter ATS control device has dual power supply modes, namely, a grid power supply mode and a generator power supply mode, and ensures the consistency of voltage and phase during switching.

[0025] The hybrid energy storage inverter ATS control device is equipped with an anti-reverse flow device on the generator input terminal 2 to avoid damage to the system caused by energy backflow.

[0026] The working principle of the present invention: the grid input is used to detect the grid voltage and supply power to the inverter; the generator input is used as a backup power supply to provide stable power supply when the grid is out of power. The inverter 485 communication interface can detect the battery status (SOC) in real time. When the grid is normal: the energy storage inverter and the load are powered by the grid. When the grid fails: the battery SOC is detected, and when it is higher than the set value, the inverter switches to off-grid mode; when the SOC is lower than the set value, the generator is started as a power source; after confirming that the generator voltage and phase are normal, it automatically switches to the generator for power supply and charges the battery at the same time; the intelligent load output can automatically adjust the load power supply strategy according to the battery SOC.

[0027] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: the power switching process is smooth, avoiding instantaneous large current shocks, and solving the power supply shock problem that may occur in the existing system; real-time monitoring is achieved through the RS485 communication interface to improve the system operation stability; the present invention realizes intelligent load management and improves energy utilization efficiency; avoids long-term power supply interruptions in the energy storage system, improves energy utilization efficiency and protects the life of the equipment, enhances the anti-interference ability and adaptability of the energy storage system, and meets the needs of complex application scenarios.

[0028] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A hybrid energy storage inverter ATS control device, characterized in that: The hybrid energy storage inverter ATS control device comprises: a power grid input end (1), a generator input end (2), an inverter 485 communication interface (3), an intelligent load output interface (4), an inverter AC interface (5), a detection unit power supply end (6), and an automatic transfer switch controller (7). The power grid input end (1) and the generator input end (2) are respectively connected to and monitor the voltage state through the automatic transfer switch controller (7), the inverter 485 communication interface (3) and the intelligent load output interface (4) are both connected to the automatic transfer switch controller (7), the detection unit power supply end (6) is connected to the power supply of the automatic transfer switch controller (7), and the inverter AC interface (5) is connected to the inverter connection end of the automatic transfer switch controller (7).

2. A hybrid energy storage inverter ATS control device according to claim 1, characterized in that The control method of the hybrid inverter ATS control device is as follows: when the grid input end (1) detects that the grid is normal, the automatic transfer switch controller (7) outputs the grid power to supply power to the energy storage inverter; when the grid is out of power or fails, the automatic transfer switch controller (7) supplies power to the smart load in an off-grid mode through the smart load output interface (4); at the same time, the automatic transfer switch controller (7) detects the SOC information of the battery and sends it to the automatic transfer switch controller (7); when the battery SOC value is lower than the set value, the automatic transfer switch controller (7) sends a generator start signal to start the generator; when the automatic transfer switch controller (7) detects that the voltage and phase of the second power supply of the generator are normal, the automatic transfer switch controller (7) automatically switches to the second power supply of the generator to supply power to the smart load.

3. A control method for a hybrid energy storage inverter ATS control device according to claim 2, characterized in that: The hybrid energy storage inverter ATS control device obtains the battery status information of the energy storage inverter through the inverter 485 communication interface (3), and controls the start-up of the generator or the start-stop of the intelligent load according to the battery status information value.

4. A control method for a hybrid energy storage inverter ATS control device according to claim 2, characterized in that: The hybrid energy storage inverter ATS control device has a detection unit power supply terminal (6) connected to a DC 5V power supply circuit, which is used to maintain the working state of the automatic transfer switch controller (7) when neither the power grid nor the generator has power supply.

5. A control method for a hybrid energy storage inverter ATS control device according to claim 2, characterized in that: The hybrid energy storage inverter ATS control device has dual power supply modes, namely, a grid power supply mode and a generator power supply mode, and ensures the consistency of voltage and phase during switching.

6. A control method for a hybrid energy storage inverter ATS control device according to claim 2, characterized in that: The hybrid energy storage inverter ATS control device is equipped with an anti-reverse flow device on the generator input end (2) side to avoid damage to the system caused by energy backflow.

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