Wind storage integrated low-temperature energy-saving environment-friendly boosting equipment special for new energy photovoltaic power generation

Abstract

The utility model discloses a wind storage integrated low-temperature energy-saving environment-friendly boosting device special for new energy photovoltaic power generation. The boosting device comprises a wind storage power supply loop, a control transformer power supply loop, a control system and an auxiliary device load. A small fan assembly is laid in an idle space at the top of the boosting device, wind power resources in a cold region are used for power generation to supply power to a control system and auxiliary equipment in the boosting device special for new energy photovoltaic power generation, and redundant power is used for charging an energy storage battery system. When a small fan assembly cannot generate power due to special climate reasons, a control transformer power supply and an energy storage battery system are matched to supply power. A UPS uninterruptible power supply system and a lead-acid storage battery which are configured in a traditional 35kV new energy photovoltaic power generation box transformer substation are replaced, and the problem that the new energy photovoltaic power generation box transformer substation is high in energy consumption due to low-temperature extremely cold environment operation conditions in a cold region is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of special boosting equipment for new energy photovoltaic power generation, and specifically to a wind-storage integrated low-temperature energy-saving and environment-friendly special boosting equipment for new energy photovoltaic power generation. Background Art

[0002] The combined transformer consists of a high-voltage circuit breaker, a disconnector, a grounding switch, a box-type transformer integrated management system, a control transformer, a step-up oil-immersed transformer, a low-voltage circuit breaker, etc. The lead-acid battery UPS uninterruptible power supply system configured in the box-type transformer is mainly used to power the box-type transformer integrated management system, lighting, temperature control, maintenance equipment, etc. in the box-type transformer, and as an emergency backup power supply. The traditional 35kV new energy photovoltaic power generation box-type transformer has high energy consumption due to the low temperature and extremely cold operating conditions in cold areas. Therefore, it is necessary to propose a wind storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated step-up equipment to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies of the prior art and provide a wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment to solve the problem of high energy consumption of new energy photovoltaic power generation box transformers due to the low temperature and extremely cold environment operating conditions in cold areas.

[0004] The utility model provides a special boosting device for wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation, comprising: a wind-storage power supply circuit, a control transformer power supply circuit, a control system and an auxiliary equipment load; the wind-storage power supply circuit comprises a small wind generator assembly, a DC distribution unit, a DC / DC bidirectional power converter, an energy storage converter, a battery energy storage system, a DC switch and a first AC low-voltage switch; the small wind generator assembly is laid in the idle space on the top of the wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation special boosting device, the output end of the small wind generator assembly is connected to the DC distribution unit, the output end of the DC distribution unit is connected to the DC / DC bidirectional power converter, the output end of the DC / DC bidirectional power converter is connected to the energy storage converter, the battery energy storage system is connected to the energy storage converter via the DC switch, and the energy storage converter is connected to the ATS automatic switching switch via the first AC low-voltage switch; the wind-storage power supply circuit and the control transformer power supply circuit are connected to the control system and the auxiliary equipment load through the ATS automatic switching switch.

[0005] Furthermore, the battery energy storage system adopts a ternary lithium, lithium iron phosphate or lithium titanate battery energy storage system.

[0006] Furthermore, the DC power distribution unit and the DC / DC bidirectional power converter are integrated in the first power distribution cabinet, and the energy storage converter, the battery energy storage system and the DC switch are integrated in the second power distribution cabinet.

[0007] Furthermore, the ATS automatic switching switch is connected to the control system and the auxiliary equipment load via the second AC low-voltage switch and the miniature circuit breaker in sequence.

[0008] Furthermore, the battery energy storage system, DC / DC bidirectional power converter, energy storage converter, and ATS automatic switching switch are respectively connected to the box-type transformer integrated management system.

[0009] The utility model has the following beneficial effects: the utility model provides a wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation special boosting equipment, in which a small wind turbine assembly is laid in the idle space on the top of the boosting equipment, and wind resources in cold areas are used to generate electricity to power the control system and auxiliary equipment in the new energy photovoltaic power generation special boosting equipment. The excess electricity is used to charge the energy storage battery system, which is used to power the control system and auxiliary equipment in the new energy photovoltaic power generation special boosting equipment during windless periods. When the small wind turbine assembly cannot generate electricity due to special climatic reasons, the control transformer power supply and the energy storage battery system are used to supply power, replacing the UPS uninterruptible power supply system and lead-acid battery configured in the traditional 35kV new energy photovoltaic power generation box transformer, solving the problem of high energy consumption of the new energy photovoltaic power generation box transformer due to the low temperature and extreme cold environment operating conditions in cold areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 This is the electrical scheme diagram of the utility model's wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment;

[0012] Figure 2 This is the main view of the structural arrangement of the utility model's wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment;

[0013] Figure 3 This is a side view of the structural arrangement of the utility model's wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment;

[0014] Figure 4 It is a top view of the structural arrangement of the utility model's wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation special boosting equipment.

[0015] Illustration: 12-first distribution cabinet; 13-second distribution cabinet; 101-35kV outgoing cable; 102-35kV live indicator; 103-35kV voltage transformer; 104-35kV combined sealed vacuum circuit breaker; 105-35kV step-up transformer; 106-low voltage side incoming circuit breaker; 107-low voltage side current transformer; 108-low voltage molded case circuit breaker; 109-low voltage side voltage transformer; 110-surge protector; 111-control transformer Protection circuit breaker; 112-control transformer; 113-control transformer matching circuit breaker 113; 114-first AC low-voltage switch; 115-ATS automatic switching switch; 116-second AC low-voltage switch; 117-miniature circuit breaker; 118-energy storage inverter; 119-DC / DC bidirectional power converter; 120-DC distribution unit; 121-battery energy storage system; 122-small wind turbine generator assembly; 123-box transformer integrated management system; 124-DC switch. DETAILED DESCRIPTION

[0016] See also Figures 1 to 4 The embodiment of the utility model provides a wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment, including: a wind-storage power supply circuit, a control transformer power supply circuit, a control system and auxiliary equipment loads.

[0017] Among them, the wind storage power supply circuit includes a small wind generator assembly 122, a DC power distribution unit 120, a DC / DC bidirectional power converter 119, an energy storage converter 118, a battery energy storage system 121, a DC switch 124 and a first AC low-voltage switch 114; the small wind generator assembly 122 is laid in the idle space on the top of the wind storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment, and the small wind generator of the small wind generator assembly 122 has an extremely low starting and entry point, extremely high wind energy utilization efficiency, and can rely on the aerodynamic efficiency of the blades themselves to prevent any small wind generator from running away under wind conditions. The wind turbine adopts high-quality high-strength permanent magnetic materials, and the generator is small in size, light in weight and has extremely high power generation efficiency. Using a DC generator, the electromagnetic design technology realizes that the generator has an extremely small starting resistance torque, which effectively ensures that the wind generator can start and run in a breeze. It is suitable for a variety of environments such as ultra-low temperature, high humidity, wind sand and salt spray, and has extremely high reliability.

[0018] The output end of the small wind turbine generator assembly 122 is connected to the DC distribution unit 120, which is used to distribute, monitor and protect DC power. The output end of the DC distribution unit 120 is connected to the DC / DC bidirectional power converter 119, which can convert the DC voltage output by the small wind turbine generator assembly into a DC voltage suitable for charging the battery energy storage system 121, thereby charging the battery energy storage system 121. The battery energy storage system 121 can use a ternary lithium, lithium iron phosphate or lithium titanate battery energy storage system.

[0019] The output end of the DC / DC bidirectional power converter 119 is connected to the energy storage converter 118, which is used to convert the DC voltage generated by the small wind turbine or the DC voltage output by the battery energy storage system 121 into a low-voltage AC voltage at an industrial frequency. The battery energy storage system 121 is connected to the energy storage converter 118 via the DC switch 124, and the energy storage converter 118 is connected to the ATS automatic switching switch 115 via the first AC low-voltage switch 114; the wind storage power supply circuit and the control transformer power supply circuit are connected to the control system and auxiliary equipment loads through the ATS automatic switching switch 115. The ATS automatic switching switch 115 is connected to the control system and auxiliary equipment loads through the second AC low-voltage switch 116 and the miniature circuit breaker 117 in turn. The wind storage power supply circuit and the control transformer power supply circuit are automatically switched at the ATS automatic switching switch 115.

[0020] The DC power distribution unit 120 and the DC / DC bidirectional power converter 119 are integrated in the first power distribution cabinet 12, and the energy storage converter 118, the battery energy storage system 121 and the DC switch 124 are integrated in the second power distribution cabinet 13. The battery energy storage system 121, the DC / DC bidirectional power converter 119, the energy storage converter 118 and the ATS automatic switching switch 115 are respectively connected to the box-type transformer integrated management system 123.

[0021] The control transformer power supply circuit can adopt the existing technology. In this embodiment, the control transformer power supply circuit has a 35kV outgoing cable 101, a 35kV live indicator 102, a 35kV voltage transformer 103, a 35kV combined sealed vacuum circuit breaker 104, a 35kV step-up transformer 105, a low-voltage side incoming line circuit breaker 106, a low-voltage side current transformer 107, a low-voltage molded case circuit breaker 108, a low-voltage side voltage transformer 109, a surge protector 110, a control transformer protection circuit breaker 111, a control transformer 112, and a control transformer matching circuit breaker 113.

[0022] The configuration and structure of the control transformer power supply circuit are as follows:

[0023] The 35kV high-voltage side of the box-type transformer uses a 35kV outgoing cable 101 to meet the wiring requirements of three 35kV cables. The terminal meets the requirements of the dynamic thermal stability of the copper bar under the rated current and short-circuit current of the step-up transformer, and is safe and reliable, and has safety measures to ensure the safe operation of the box-type transformer. A 35kV voltage transformer 103 is configured to provide voltage signals for meters and box-type transformer integrated management systems. The high-voltage room door is equipped with an active electromagnetic lock and a 35kV live indicator 102. When the high-voltage side is energized, the high-voltage room door cannot be opened; if the high-voltage room door is opened with power, it has an alarm function and realizes five-protection linkage. The high-voltage circuit breaker uses a 35kV combined sealed vacuum circuit breaker 104, which integrates a circuit breaker, a customized disconnector and a grounding switch, and is equipped with a high-voltage lightning arrester and a customized current transformer; it can achieve a more reliable interlocking function.

[0024] The vacuum circuit breaker should adopt a structure in which the operating mechanism and the body are integrated. The vacuum arc extinguishing chamber adopts a sealed pole type. Through epoxy resin solid insulation, it can achieve reliable operation in ultra-low temperature environment. The operating mechanism adopts a permanent magnet operating mechanism to ensure that the circuit breaker can open and close the three-phase circuit breaker, as well as three-phase tripping and automatic reclosing. The operating mechanism has the performance of preventing jumping. Equipped with the circuit breaker opening and closing indication, the operating mechanism counter, the high-voltage disconnector should adopt a special three-phase linkage disconnector, and a matching grounding switch, which can realize reliable interlocking function with the circuit breaker. The high-voltage lightning arrester adopts a gapless metal zinc oxide lightning arrester and is equipped with an online monitoring device, such as a leakage current and action recorder. The 35KV current transformer can provide current and protection signals for the meter and box-type transformer integrated management system.

[0025] 35kV step-up transformer 105, the transformer uses 35kV first-level energy efficiency S22 power transformer, three-phase, double winding, no-load voltage regulation, self-cooling. It can effectively convert input electrical energy into output electrical energy, reduce energy loss, and improve energy utilization efficiency. The transformer uses high-quality materials, including high-quality copper wire and high-permeability iron core. Reasonable design of the structure and parameters of the transformer, including the number of turns, cross-sectional area and winding method of the coil, so that the transformer can achieve the best working state when working under rated load. The transformer is equipped with heavy gas, light gas, oil level, pressure, oil temperature and other protection devices, and can output heavy gas signal, light gas signal, low oil level number, pressure release signal, 4mA ~ 20mA oil temperature signal to access the box-type transformer integrated management system. The first-level energy efficiency transformer can not only reduce energy consumption and environmental pollution, but also improve the power supply quality and stability of the power grid.

[0026] The low-voltage side incoming line circuit breaker 106, as the line protection of the low-voltage side, adopts a zero arcing structure and is a low-temperature resistant product. The trip unit has long-delay protection, short-delay protection, instantaneous tripping protection and grounding protection functions, and is equipped with a communication module and an electric operating mechanism. The current and time setting values ​​can be continuously adjusted on site as required. The trip unit is modularly designed, and the intelligent function expansion of the circuit breaker can be completed online and anywhere without powering off.

[0027] The low-voltage side current transformer 107 provides current signals for the meter and the box-type transformer integrated management system.

[0028] Low voltage molded case circuit breaker 108, the rated voltage level of the circuit breaker matches the rated voltage of the AC side of the inverter and the low voltage side of the box-type transformer. The rated current of the circuit breaker meets the capacity requirements of the inverter, and is equipped with a PLC acquisition module loop circuit breaker to meet the PLC carrier communication requirements. The circuit breaker has auxiliary contacts. It meets the performance level requirements of system voltage, current, frequency and breaking capacity. The molded case circuit breaker has a limited current breaking capacity. The circuit breaker is designed with a modular structure and is easy to install. Various accessories such as shunt release, auxiliary contacts, and alarm contacts can be installed without removing the molded case circuit breaker casing, without changing the circuit breaker structure.

[0029] Equipped with three low-voltage side voltage transformers 109, the low-voltage side voltage output AC100V can be achieved. The surge protector 110 adopts B+C level lightning protection and surge protection device, has the function of uploading fault signals, and the opening and closing of its front-end protection element also has the function of sending signals.

[0030] Self-use power equipment: The box-type substation is equipped with self-use power equipment, the control transformer 112 is set as three-phase, dry type, the rated voltage output is AC400V, the terminal is equipped with a protective cover, including lighting, anti-condensation devices, etc. The control transformer protection circuit breaker 111 and the control transformer matching circuit breaker 113 meet the rated voltage and rated current requirements of the product.

[0031] The box-type transformer integrated management system 123 is used for monitoring, protection and control of the dedicated boosting equipment for wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation. It can realize the remote management and automatic monitoring of all information in the dedicated boosting equipment for wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation, and realize its own four remote functions of "telemetry, remote communication, remote control and remote adjustment" through remote control, as shown in Table 1.

[0032] Table 1 Telecontrol information volume

[0033]

[0034]

[0035] The above four remote functions are used to realize the measurement and calculation of three-phase current, voltage, frequency, power factor, active power, reactive power and other AC industrial frequency electrical quantities at each power point of the wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation special boosting equipment, realize three-stage current protection, zero-sequence current protection, low voltage protection, high voltage protection and transformer oil over-temperature alarm protection, etc., realize remote control operation of each main switch, realize the control of the power generation power of the small wind turbine assembly 122 and the charging and discharging power of the battery energy storage system 121, and upload all important signals to the monitoring background.

[0036] The equipment can be equipped with an intelligent fire extinguishing system, which uses a heptafluoropropane fire extinguishing system, consisting of a fire extinguishing agent storage bottle, a container valve, a driver, a high-pressure hose, a pressure signal device, a nozzle, a cabinet, etc. It does not need to install a fire extinguishing agent delivery pipeline or a dedicated bottle storage room. The device is set in the protection area. When a fire occurs, the fire extinguishing agent is directly sprayed into the protection area. There is no pipeline loss of the fire extinguishing agent, and the fire extinguishing speed is faster and more efficient.

[0037] The high-pressure chamber and low-pressure chamber in the equipment are equipped with air curtain devices, and the newly upgraded high-performance PTC ceramic heaters are made of efficient and powerful materials that quickly warm up and suppress temperature rise to prevent abnormal overheating. The air volume through the area is doubled to 2 times, and the temperature protection range can be extended to the ground to maintain the internal temperature in all directions. Ensure that the internal components can work safely and reliably in the external ultra-low temperature environment.

[0038] The working principle of the utility model of wind storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment is as follows:

[0039] When the wind power at the project site meets the power generation conditions of the small wind turbine generator assembly 122 and meets the power consumption of the control system and auxiliary equipment load in the boosting equipment, the ATS automatic switching switch 115 switches to the wind storage power supply circuit, and the electric energy generated by the small wind turbine generator assembly 122 is supplied to the control system and auxiliary equipment load in the boosting equipment through the DC distribution unit 120, DC / DC bidirectional power converter 119, energy storage inverter 118, AC low-voltage switch 114 and ATS automatic switching switch 115.

[0040] When the wind force on site is weak, the small wind turbine assembly 122 charges the battery energy storage system 121, and the control transformer power supply circuit supplies power to the control system and auxiliary equipment loads. At this time, the ATS automatic switching switch 115 switches to the control transformer power supply circuit side;

[0041] When the wind force is strong on site, the small wind turbine assembly 122 generates electricity to supply power to the control system and auxiliary equipment loads. If the power generated by the small wind turbine assembly 122 is greater than the power consumption of the load, the excess power is stored in the battery energy storage system 121;

[0042] When there is no wind on site, the small wind turbine generator assembly 122 does not generate electricity, and the control system and auxiliary equipment loads are powered by the control transformer power supply circuit.

[0043] In summary, the utility model lays a small wind turbine generator assembly in the idle space on the top of the boosting equipment. The small wind turbine generator assembly realizes wind power generation to power the control system and auxiliary equipment in the boosting equipment. The excess electricity is used to charge the energy storage battery system, which is used to power the control system and auxiliary equipment in the boosting equipment. When the small wind turbine generator assembly cannot generate electricity in abnormal weather, the control transformer power supply and the energy storage battery system are used to power the control system and auxiliary equipment in the boosting equipment. The UPS uninterruptible power supply system and lead-acid battery configured in the traditional 35kV new energy booster box transformer are replaced. The small wind turbine generator power generation system cooperates with the lithium iron phosphate battery energy storage system to replace the traditional lead-acid battery UPS system. Wind power generation is energy-saving and environmentally friendly, and the lithium iron phosphate battery has a high energy density, which solves the problem of high power consumption of the traditional 35kV new energy photovoltaic booster box transformer, which is convenient for improving equipment utilization and safety and reliability, reducing the workload of operation and maintenance, and reducing the cost of operation and maintenance.

[0044] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment, characterized in that: include: Wind power supply circuit, control transformer power supply circuit, control system and auxiliary equipment load; The wind storage power supply circuit comprises a small wind generator assembly (122), a DC power distribution unit (120), a DC / DC bidirectional power converter (119), an energy storage converter (118), a battery energy storage system (121), a DC switch (124) and a first AC low-voltage switch (114); the small wind generator assembly (122) is laid in the idle space on the top of the wind storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment, the output end of the small wind generator assembly (122) is connected to the DC power distribution unit (120), and the DC power distribution unit (121) is connected to the DC power distribution unit (120). The output end of the electric unit (120) is connected to a DC / DC bidirectional power converter (119), the output end of the DC / DC bidirectional power converter (119) is connected to an energy storage converter (118), the battery energy storage system (121) is connected to the energy storage converter (118) via a DC switch (124), the energy storage converter (118) is connected to an ATS automatic switching switch (115) via a first AC low-voltage switch (114); the wind storage power supply circuit and the control transformer power supply circuit are connected to a control system and an auxiliary equipment load via the ATS automatic switching switch (115).

2. The wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment as claimed in claim 1, characterized in that: The battery energy storage system (121) adopts a ternary lithium, lithium iron phosphate or lithium titanate battery energy storage system.

3. The wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment as claimed in claim 1, characterized in that: The DC power distribution unit (120) and the DC / DC bidirectional power converter (119) are integrated in the first power distribution cabinet (12), and the energy storage converter (118), the battery energy storage system (121) and the DC switch (124) are integrated in the second power distribution cabinet (13).

4. The wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment as claimed in claim 1, characterized in that: The ATS automatic transfer switch (115) is connected to the control system and the auxiliary equipment load via the second AC low-voltage switch (116) and the miniature circuit breaker (117) in sequence.

5. The wind-storage integrated low-temperature energy-saving and environmentally friendly new energy photovoltaic power generation dedicated boosting equipment as claimed in claim 1, characterized in that: The battery energy storage system (121), the DC / DC bidirectional power converter (119), the energy storage converter (118), and the ATS automatic switching switch (115) are respectively connected to the box-type transformer integrated management system (123).

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