Uninterruptible power supply guarantee system of solar photo-thermal coupling heat collecting unit

Abstract

The utility model relates to the technical field of heat collection unit power supply, in particular to an uninterruptible power supply guarantee system for a solar photo-thermal coupling heat collection unit, which comprises a power EPS cabinet, a mains supply and a diesel generator power supply are connected in parallel, the two power supplies are switched to continuously supply electric energy, and the system operates stably and reliably. The power EPS cabinet integrates a contactor, a charger, a battery pack and an inverter which are interlocked electrically and mechanically and is connected with the solar heat collection unit frequency conversion cabinet. And by being compatible with a renewable energy system, the energy cost and the environmental influence can be reduced. Mutual interference and misoperation between the power supplies are prevented, and the safety of the system is improved. When the mains supply is normal, the system supplies power through the mains supply, a stable power supply environment is ensured, the EPS alternating current contactor is quickly switched when the mains supply is cut off, and is automatically switched after the power supply is stable, so that the diesel generator can be timely connected when the mains supply and the battery pack cannot supply power, the seamless joint of the standby power supply is realized, and the normal operation of the system is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for heat collection units, in particular to an uninterruptible power supply guarantee system for a solar photovoltaic-thermal coupled heat collection unit. Background Technique

[0002] At present, the most widely used heat collection unit is the heat pump system. However, traditional heat collection units mainly use commercial power, and the commercial power supply is single. During the commercial power supply process, real-time power storage cannot be carried out, and sudden power outages cannot be dealt with. When the commercial power is cut off, other power supply methods cannot be switched in time. Moreover, solar energy cannot be effectively utilized and there is no energy storage means, which not only wastes electricity but also makes it difficult to balance the matching relationship between building energy demand and supply. In the "photovoltaic + heat pump + energy storage" system, when the heat collection unit is used as photovoltaic energy storage and the solar irradiance is high during the day, the heat collection circulation pump does not operate due to power supply problems, resulting in unstable power supply, which will cause the temperature and pressure of a large number of solar collectors to be too high, damage to the solar collectors, and damage to the internal circulating medium, causing greater losses. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, to solve the problems raised in the above background technique, the technical problem to be solved by the utility model is to provide a solar photovoltaic-thermal coupled heat collection unit uninterruptible power supply guarantee system with reasonable design, practical simplicity, and stable power supply in view of the deficiencies of the prior art.

[0004] The technical problem to be solved by the utility model is realized through the following technical solutions. A solar photovoltaic-thermal coupled heat collection unit uninterruptible power supply guarantee system includes a power EPS cabinet. The power EPS cabinet includes an incoming line input end and an output end. The incoming line input end is connected to an incoming line power supply. The incoming line power supply includes a commercial power supply and a diesel generator power supply arranged in parallel. The output end is provided with a solar heat collection unit frequency conversion cabinet. By paralleling the commercial power supply and the diesel generator power supply, it is ensured that when one power supply fails, the other power supply can continue to provide power, improving the reliability and stability of the system.

[0005] The power EPS cabinet is internally provided with a commercial power AC contactor, a diesel generator AC contactor, and an EPS AC contactor that are arranged in parallel and achieve electrical and mechanical interlocking. This prevents mutual interference and misoperation between power supplies and improves the safety of the system.

[0006] Both the commercial power AC contactor and the EPS AC contactor are connected to the commercial power supply through wires. The diesel generator AC contactor is connected to the diesel generator power supply through wires. The output ends of the commercial power AC contactor, the diesel generator AC contactor, and the EPS AC contactor are all connected to the solar heat collection unit frequency conversion cabinet. It supports compatibility with renewable energy systems, helping to reduce energy costs and environmental impacts.

[0007] An EPS AC contactor is successively provided with a charger, a battery pack, and an inverter along the electric transmission direction on the wire between it and the mains power supply. The uninterruptible power supply (UPS) function is realized, and even when both the mains power supply and the diesel generator power supply fail, the battery pack can provide backup power. By centrally controlling and optimizing the management of various power supplies and devices, the overall system efficiency and operation convenience are improved.

[0008] As a further solution of the present utility model, the frequency conversion cabinet of the solar heat collection unit is connected with a solar heat collection unit circulating pump. The outgoing line end of the frequency conversion cabinet of the solar heat collection unit is connected to the power supply of the solar heat collection unit circulating pump, and the solar heat collection unit circulating pump is a variable frequency pump. The frequency conversion cabinet of the solar heat collection unit controls the variable frequency pump and adjusts the running speed of the pump according to actual needs, improving the energy utilization efficiency and reducing unnecessary energy consumption. The variable frequency pump adapts to the special environment of high altitude areas, ensuring the stable operation of the solar heat collection system under various geographical conditions. The speed regulation function of the variable frequency pump and the intelligent control of the frequency conversion cabinet of the solar heat collection unit can better adapt to load changes, enhancing the stability and reliability of the system. Through frequency conversion regulation, the starting impact and running load of the pump are reduced, thereby prolonging the service life of the pump.

[0009] As a further solution of the present utility model, both the input voltage and the output voltage of the power EPS cabinet are 380V voltage. 380V is a commonly used voltage standard in the industrial and commercial fields. Unifying the voltage level simplifies the system design and equipment selection, ensuring good compatibility with other equipment and systems. It simplifies the design and maintenance work of the electrical system, reducing electrical problems and maintenance costs caused by voltage mismatch. The consistent input and output voltages reduce the losses and potential electrical faults during the voltage conversion process, improving the stability and reliability of the entire system.

[0010] As a further solution of the present utility model, the charger is provided with an LED display and has overvoltage protection function, undervoltage protection function, overtemperature protection function, overcurrent protection function, and short-circuit protection function. The LED display provides a clear indication of the charging status, enabling users to conveniently monitor the charging process. Each function ensures the safe operation of the charger under various abnormal conditions, preventing equipment damage and safety hazards. It prevents possible electrical faults and overheating problems, protecting the safety of users and equipment.

[0011] As a further solution of the present utility model, the battery pack is an intelligent battery pack with a charging management function, having an automatic charge and discharge protection function for the battery pack, enhancing the safety and performance of the battery pack, avoiding the risks of overcharging and over-discharging, and prolonging the service life of the battery pack.

[0012] Supports Modbus TCP or Modbus RTU protocols, enabling the battery pack to be easily integrated with other systems for data transmission and device interoperability. It has a remote monitoring function that allows users to track the status and performance of the battery pack in real time, facilitating maintenance and management and enhancing the convenience and efficiency of operations.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The system includes a power EPS cabinet, which has an incoming line input terminal and an output terminal. The incoming line input terminal is connected to an incoming line power supply, which includes a mains power supply and a diesel generator power supply arranged in parallel. By paralleling the mains power supply and the diesel generator power supply, it is ensured that when one power supply fails, the other power supply can continue to provide power, enhancing the reliability and stability of the system.

[0014] The power EPS cabinet integrates an electrical and mechanical interlocked mains AC contactor, a diesel generator AC contactor, an EPS AC contactor, a charger, a battery pack, and an inverter, and all are connected to the solar collector unit frequency conversion cabinet; Compatibility with renewable energy systems helps reduce energy costs and environmental impacts. It prevents mutual interference and misoperation between power supplies, improving the safety of the system. Centralized control and optimized management of various power supplies and devices enhance the overall system efficiency and operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system principle of the present utility model.

[0016] In the figure: 1 - mains power supply, 2 - diesel generator power supply, 3 - mains AC contactor, 4 - diesel generator AC contactor, 5 - EPS AC contactor, 6 - inverter, 7 - battery pack, 8 - charger, 9 - solar collector unit frequency conversion cabinet, 10 - solar collector unit circulation pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the objectives, technical solutions, and advantages of the present utility model more clear and understandable, the following further details the present utility model through embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] The serial numbers assigned to components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model.

[0019] In the present utility model, unless otherwise clearly specified and defined, when the first feature is "above" or "below" the second feature, it means that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on" the second feature, it may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "below", "under" and "beneath" the second feature, it means that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0020] Embodiment 1

[0021] As Figure 1 shown, an uninterruptible power supply guarantee system for a solar photovoltaic-thermal coupling heat collection unit includes a power EPS cabinet. The power EPS cabinet includes an incoming line input end and an output end. The input voltage and output voltage of the power EPS cabinet are both 380V voltage. 380V is a commonly used voltage standard in the industrial and commercial fields. Unifying the voltage level simplifies the system design and equipment selection and maintains good compatibility with other equipment and systems. Moreover, through the consistent input and output voltages, the losses and potential electrical faults during the voltage conversion process are reduced.

[0022] The incoming line input end is connected to an incoming line power supply. The incoming line power supply includes a commercial power supply 1 and a diesel generator power supply 2 arranged in parallel. The output end is provided with a solar heat collection unit frequency conversion cabinet 9; when the commercial power supply and the diesel generator power supply are in parallel and one of the power supplies fails, the other power supply can continue to provide power.

[0023] In the power EPS cabinet, there are a commercial power AC contactor 3, a diesel generator AC contactor 4, and an EPS AC contactor 5 arranged in parallel and realizing electrical and mechanical interlocking. The contactors are arranged in parallel with each other to prevent mutual interference and misoperation between the power supplies, and improve the safety of the system.

[0024] Both the mains AC contactor and the EPS AC contactor are connected to the mains power supply through wires, and the diesel generator AC contactor is connected to the diesel generator power supply through wires. The output ends of the mains AC contactor, the diesel generator AC contactor, and the EPS AC contactor are all connected to the frequency conversion cabinet 9 of the solar heat collection unit;

[0025] On the wire between the EPS AC contactor and the mains power supply, a charger 8, a battery pack 7, and an inverter 6 are arranged in sequence along the power transmission direction. During the power supply of the mains power supply, the battery pack is powered by the charger to form standby electric energy. When both the mains power supply and the diesel generator power supply fail, the standby electric energy is provided by the battery pack. The charger 8 is provided with an LED display and has overvoltage protection function, undervoltage protection function, overtemperature protection function, overcurrent protection function, and short-circuit protection function. The charger 8 only works to charge the battery pack when there is a mains power supply, and the charger starts the charging automatic protection function. The LED display clearly indicates the charging status, enabling users to conveniently monitor the charging process. It can operate safely under abnormal conditions during the charging process, prevent equipment damage and potential safety hazards, and at the same time solve electrical faults and overheating problems, protecting the safety of users and equipment.

[0026] The battery pack 7 is an intelligent battery pack with a charging management function, having an automatic charge and discharge protection function for the battery pack. During charging, it monitors the charging status of the battery pack to prevent overcharging or over-discharging of the battery pack, and the battery pack operates normally.

[0027] The battery pack 7 supports the modbustcp or modbusrtu protocol. When the battery pack is working, it is integrated with other systems to achieve data transmission and device interoperability.

[0028] The battery pack 7 has a remote monitoring function, allowing users to track the status and performance of the battery pack in real time, facilitating maintenance and management, and improving the convenience and efficiency of operation.

[0029] The frequency conversion cabinet 9 of the solar heat collection unit is connected with a solar heat collection unit circulation pump 10. The outgoing line end of the frequency conversion cabinet of the solar heat collection unit is connected to the power supply of the solar heat collection unit circulation pump. The frequency conversion cabinet of the solar heat collection unit supplies power to the power supply of the solar heat collection unit circulation pump, driving the smooth operation of the solar heat collection system.

[0030] The solar heat collection unit circulation pump 10 is a variable-frequency pump. The variable-frequency pump and all components and electrical equipment in this system need to meet the corresponding altitude and temperature requirements. The operating speed of the variable-frequency pump is adjusted according to actual needs, and it cooperates with the intelligent control of the frequency conversion cabinet of the solar heat collection unit to adapt to load changes and the special environment in high-altitude areas, ensuring the stable operation of the solar heat collection system under various geographical conditions.

[0031] Embodiment 2

[0032] During the operation of the uninterruptible power supply system for the solar thermal-coupled collector unit, when the mains power supply is normal, the mains AC contactor 3 closes to supply power to the frequency conversion cabinet 9 of the solar collector unit and the circulating pump 10 of the solar collector unit. At the same time, the battery pack is charged through the charger. During the charging period, the charging status of the battery pack is monitored to ensure that the battery pack will not be overcharged or over-discharged. After the battery pack is fully charged, it stops automatically. When the power supply is abnormal, the battery pack supplies power safely and normally.

[0033] Embodiment 3

[0034] Different from Embodiment 2, during the operation of the uninterruptible power supply system for the solar thermal-coupled collector unit, when the mains power supply is cut off, the EPS AC contactor 5 closes, and the closing time is less than 0.25 seconds, to supply power to the frequency conversion cabinet 9 of the solar collector unit and the circulating pump 10 of the solar collector unit; when the mains power supply is cut off, the quick switching time of the EPS AC contactor is less than 0.25 seconds, and it quickly switches to the battery pack for power supply, always maintaining continuous power supply to the frequency conversion cabinet of the solar collector unit and the circulating pump of the solar collector unit.

[0035] Embodiment 4

[0036] Different from Embodiment 1 and Embodiment 2, during the operation of the uninterruptible power supply system for the solar thermal-coupled collector unit, when it is detected that the diesel generator power supply is normal, after 15 seconds of power supply, the EPS AC contactor 5 disconnects, and the battery pack stops supplying power;

[0037] Then the diesel generator AC contactor closes, and the diesel generator power supply supplies power to the frequency conversion cabinet 9 of the solar collector unit and the circulating pump 10 of the solar collector unit, always maintaining continuous power supply to the frequency conversion cabinet of the solar collector unit and the circulating pump of the solar collector unit.

[0038] Embodiment 5

[0039] During the entire power supply process of the system, the power supply usage priorities are as follows: mains power supply, battery pack power supply, and diesel generator power supply. The mains power supply is preferentially used, with the lowest usage cost and saving operation expenses.

[0040] When the mains power is cut off, the battery pack power supply is used to avoid frequent charging and discharging, and the service life of the battery pack is long. In the case where the mains power is cut off and the battery pack power supply cannot continue to supply power, the diesel generator is used to maintain stable power supply and operation of the system. The usage frequency of the diesel generator power supply is low, extending the service life of the diesel generator.

[0041] All the electrical components mentioned in this article are electrically connected to the external main controller and 380V commercial power, and the main controller can be a conventional known device such as a computer for control.

[0042] In the description of this specification, terms such as "connection", "installation", "fixation", "setting", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and technical effects, and it can also be an integral connection or a partial connection. In the case of this example, for those of ordinary skill in the art, the specific meanings of the above terms in this utility model or the invention can be understood according to specific circumstances. As mentioned above, the above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An uninterruptible power supply system for a solar thermal coupling collector unit, characterized in that: The power EPS cabinet comprises an incoming line input terminal and an output terminal, the incoming line input terminal is connected to an incoming line power supply, the incoming line power supply comprises a mains power supply (1) and a diesel generator power supply (2) arranged in parallel, and the output terminal is provided with a solar thermal collector unit frequency conversion cabinet (9); The power EPS cabinet is provided with a mains AC contactor (3), a diesel generator AC contactor (4) and an EPS AC contactor (5) which are arranged in parallel and realize electrical and mechanical interlocking. The mains AC contactor and the EPS AC contactor are both connected to the mains power supply through a wire, and the diesel generator AC contactor is connected to the diesel generator power supply through a wire. The output ends of the mains AC contactor, the diesel generator AC contactor and the EPS AC contactor are all connected to the frequency conversion cabinet (9) of the solar thermal collector unit. A charger (8), a battery pack (7) and an inverter (6) are arranged in sequence on the conductor between the EPS AC contactor and the commercial power supply along the power transmission direction.

2. According to claim 1, the uninterruptible power supply system for solar thermal coupling collector unit is characterized by: The solar thermal collector unit frequency conversion cabinet (9) is connected to a solar thermal collector unit circulation pump (10), and the solar thermal collector unit frequency conversion cabinet outlet is connected to a power supply of the solar thermal collector unit circulation pump, and the solar thermal collector unit circulation pump is a frequency conversion pump.

3. The uninterruptible power supply system for solar-thermal coupled collector units according to claim 2 is characterized by: The input voltage and output voltage of the power EPS cabinet are both 380V.

4. The uninterruptible power supply system for solar-thermal coupled collector units according to claim 3 is characterized by: The charger (8) is provided with an LED display and has overvoltage protection function, undervoltage protection function, overtemperature protection function, overcurrent protection function and short circuit protection function.

5. The uninterruptible power supply system for solar-thermal coupled collector units according to claim 4 is characterized by: The battery pack (7) is an intelligent battery pack with a charging management function, has an automatic protection function for battery pack charging and discharging, supports the modbustcp or modbusrtu protocol, and has a remote monitoring function.

Images