Photovoltaic power generation system for combustion engine power plant

Abstract

The utility model provides a kind of photovoltaic power generation system of gas turbine power plant, comprising: photovoltaic module, the photovoltaic module is installed on the surface of power plant roof and parking lot;Grid-connected inverter, the output end of the photovoltaic module is connected with grid-connected inverter by direct-current cable, the AC output end of grid-connected inverter is connected with grid-connected cabinet by alternating current cable;Grid-connected cabinet, the grid-connected cabinet is connected with the station service bus of power plant, and is connected with the output end of grid-connected inverter, and power transmission is carried out to station service system by access point;Station service transformer, the low voltage side of station service transformer is connected with grid-connected cabinet, the low voltage side busbar is connected with the station service system of power plant, by spontaneous self-use mode and is incorporated into 380V station service system, and the dependence on external power grid is reduced as far as possible.In normal circumstances, photovoltaic power generation capacity directly powers station service system;If photovoltaic power generation cannot fully meet demand, then redundant power is sent to high-voltage station service by station service transformer, to ensure stable power supply.

Description

Technical Field

[0001] This utility model specifically relates to a photovoltaic power generation system for a gas turbine power plant. Background Technology

[0002] Existing combined heat and power (CHP) projects utilize steam-gas combined cycle generator units, aiming to simultaneously provide electricity and heat through CHP to improve energy efficiency. However, during normal unit operation, plant and office power is supplied by the generator system, achieving self-consumption and ensuring the plant's daily production and office needs. During unit maintenance, to guarantee plant power supply, the power grid provides power through the standby transformer system, forming a reverse power supply operation mode.

[0003] Based on current production and operational data, the plant's total annual electricity consumption is approximately 89 million kWh. Without deducting heating costs, the plant's electricity consumption rate is approximately 2.1%. This rate is relatively high, especially given the significant pressure on power generation costs, preventing a substantial reduction and hindering the achievement of energy conservation and cost reduction goals. While current operational optimization measures have improved the rate somewhat, it remains around 2%, failing to achieve a further significant reduction.

[0004] To reduce the plant's power consumption rate and optimize the use of power resources, the plant has implemented some preliminary solutions. These solutions include: promptly transferring power from the high-voltage plant transformer to the standby transformer after unit shutdown, thereby reducing the number of transformers; reducing transformer losses; and rationally adjusting the operation modes of various sections of the plant's power consumption system. These measures have achieved some results, reducing some power losses and equipment load, and alleviating operating costs. However, the plant's power consumption rate has not yet significantly decreased and remains at a high level. Therefore, while the existing solutions have been effective to some extent, due to the large demand for plant power and high generation costs, there is still significant room for improvement in reducing the plant's power consumption rate and conserving resources. Utility Model Content

[0005] This invention proposes a photovoltaic power generation system for a gas turbine power plant. The system is integrated into the 380V plant auxiliary power system through self-consumption, minimizing reliance on the external power grid. Under normal circumstances, the photovoltaic power generation directly supplies the plant auxiliary power system. If photovoltaic power generation cannot fully meet demand, excess electricity is transmitted to the high-voltage plant auxiliary power system via the plant auxiliary transformer, ensuring a stable power supply. Simultaneously, the photovoltaic power generation capacity is rationally allocated to reduce power losses caused by long transmission lines, thereby lowering the plant auxiliary power rate.

[0006] The technical solution of this utility model is as follows: A photovoltaic power generation system for a gas turbine power plant, comprising:

[0007] A photovoltaic module, wherein the photovoltaic module is installed on the surface of the power plant roof and parking lot, and the photovoltaic module is fixedly connected to the surface of the power plant roof and parking lot by a bracket and a mounting base;

[0008] A grid-connected inverter, wherein the grid-connected inverter is connected to the output terminal of the photovoltaic module via a DC cable, and the AC output terminal of the grid-connected inverter is connected to the grid-connected cabinet via an AC cable;

[0009] The grid-connected cabinet is connected to the power plant's auxiliary power bus and to the output terminal of the grid-connected inverter, and transmits power to the auxiliary power system through the access point.

[0010] A plant service transformer, wherein the low-voltage side of the plant service transformer is connected to the grid-connected cabinet, and the low-voltage side busbar is connected to the plant service power system of the power plant;

[0011] A connector is used to connect cables between photovoltaic modules, grid-connected inverters, grid-connected cabinets and plant transformers to realize power transmission between the various components. It includes a first connector, a telescopic connecting line threaded to the first connector, and a second connector threaded to the telescopic connecting line. The telescopic connecting line has a locking hole at its telescopic position and a barbed locking head that engages with the locking hole.

[0012] Preferably, the photovoltaic module includes several unit modules, each unit module is fixed to the roof surface or parking lot surface by a bracket, and the photovoltaic modules are connected to each other by series or parallel cables to achieve electrical connection.

[0013] Preferably, the grid-connected inverter is a string inverter, which is connected to different photovoltaic module groups via cables, and the AC output terminal of the inverter is connected to the access terminal of the grid-connected cabinet via a cable.

[0014] Preferably, the grid-connected cabinet includes switching equipment and protection devices. The grid-connected cabinet is connected to the power plant's auxiliary power busbar via a cable, and both ends of the cable are connected to the busbar via connectors.

[0015] Preferably, the low-voltage busbar of the plant service transformer is connected to the AC input terminal of the grid-connected cabinet, and the plant service transformer is connected to the input terminal of the power plant's power system via a cable.

[0016] Preferably, the photovoltaic modules, grid-connected inverters, grid-connected cabinets, plant transformers, and plant power systems are connected by electrical connection devices, and the cables are stably connected by joints and connectors.

[0017] Preferably, the roof of the power plant and the surface of the parking lot are equipped with brackets, which are bolted to the roof surface or the parking lot surface, and the photovoltaic modules are fixed to the brackets by clips or bolts.

[0018] Preferably, the grid-connected inverter is installed in the computer room or on the equipment platform and fixed to the ground by a mounting bracket. The cable connection between the grid-connected inverter and the grid-connected cabinet is fixedly connected by a terminal block.

[0019] Preferably, the various parts of the photovoltaic power generation system of the gas turbine power plant are monitored and transmitted through monitoring and communication lines, which are connected to the grid-connected cabinet and the plant transformer.

[0020] Preferably, the grid-connected cabinet transmits AC power to the power input terminal of the plant power system via a busbar, and the AC power is connected to other electrical equipment in the power plant via the busbar.

[0021] The working principle and beneficial effects of this utility model are as follows: By introducing a photovoltaic power generation system and carrying out reasonable electrical system modifications, this project will effectively reduce the plant's power consumption rate, decrease grid power consumption, save resources, and lower power generation costs. Simultaneously, combined with a modern electrical protection and metering system, it ensures the safe, stable, and efficient operation of the system. This solution not only increases the proportion of energy self-sufficiency but also brings sustainable green electricity to the plant area. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of a photovoltaic power generation system in a gas turbine power plant;

[0024] Figure 2 This is a schematic diagram of the overall structure of a connector for a photovoltaic power generation system in a gas turbine power plant.

[0025] Figure 3 This is a schematic diagram of the exploded structure of a connector in a photovoltaic power generation system of a gas turbine power plant.

[0026] Figure 4 This is a schematic diagram of a photovoltaic power generation system in a gas turbine power plant.

[0027] Figure 5 This is an electrical primary system diagram of a photovoltaic power generation system in a gas turbine power plant;

[0028] Figure 6 This is a primary diagram of the grid-connected cabinet of a photovoltaic power generation system in a gas turbine power plant. Detailed Implementation

[0029] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0030] Implementation

[0031] See Figure 1-4 As shown, a photovoltaic power generation system for a gas turbine power plant includes:

[0032] Photovoltaic module 1, which is installed on the surface of the power plant roof and parking lot, and is fixedly connected to the surface of the power plant roof and parking lot by a bracket and a mounting base;

[0033] Grid-connected inverter 2, which is connected to the output terminal of photovoltaic module 1 via a DC cable, and the AC output terminal of grid-connected inverter 2 is connected to grid-connected cabinet 3 via an AC cable;

[0034] Grid-connected cabinet 3 is connected to the power plant's auxiliary power bus and to the output terminal of grid-connected inverter 2, and transmits power to the auxiliary power system through the access point;

[0035] Plant service transformer 4, the low-voltage side of the plant service transformer 4 is connected to the grid-connected cabinet 3, and the low-voltage side busbar is connected to the plant service power system of the power plant;

[0036] Connector 5 is used to connect the cables between photovoltaic module 1, grid-connected inverter 2, grid-connected cabinet 3 and plant transformer 4 to realize power transmission between the various components. It includes a first connector 51, a telescopic connecting line 52 threaded to the first connector 51, and a second connector 53 threaded to the telescopic connecting line 52. The telescopic connecting line 52 has a locking hole 54 at its telescopic position and a barbed locking head 55 that engages with the locking hole 54.

[0037] By installing photovoltaic (PV) modules 1 on the power plant rooftop and parking areas, solar power is used to supply electricity to the plant's auxiliary power system, reducing dependence on the external power grid and lowering the procurement cost of auxiliary power. This will significantly improve energy efficiency, reduce electricity expenditure, and thus achieve long-term cost savings. PV power generation is a clean energy source that does not produce pollutant emissions. By introducing a PV power generation system, the power plant can reduce its carbon emissions and environmental impact, meeting modern environmental protection requirements and promoting sustainable development. The PV power generation system provides an additional source of power for the auxiliary power system, ensuring a stable supply, especially during power plant maintenance or peak load periods. Furthermore, the system is directly connected to the power plant's power system through grid-connected inverters 2 and grid-connected cabinets 3, enhancing power supply capacity and system reliability, and reducing the risk of power outages.

[0038] The photovoltaic module 1 includes several unit modules, each of which is fixed to the roof surface or parking lot surface by a bracket. The photovoltaic modules 1 are connected to each other by series or parallel cables to achieve electrical connection. The grid-connected inverter 2 is a string inverter, which is connected to different photovoltaic module groups 1 by cables. The AC output terminal of the inverter is connected to the access terminal of the grid-connected cabinet 3 by a cable.

[0039] By dividing photovoltaic (PV) modules 1 into multiple unit modules and connecting them via series or parallel cables, the power output can be flexibly adjusted according to actual needs. This configuration not only facilitates customization based on the characteristics of different sites (such as rooftops or parking lots) but also allows for system expansion to accommodate future growth in demand, adding more PV modules 1 or inverters without requiring large-scale reconfiguration. String inverters can control the power conversion of different PV module groups 1 independently, reducing the impact of a single module or component failure on the overall system performance. If one group of PV modules 1 malfunctions, the power output of other groups can still operate normally, improving system stability and anti-interference capabilities. Furthermore, the inverter configuration optimizes the power generation efficiency of each PV group, enhancing overall system performance. Because each inverter controls one group of PV modules 1, faults can be quickly located, reducing troubleshooting time and improving maintenance efficiency. In addition, the modular design makes system maintenance and replacement more convenient, reducing long-term maintenance costs.

[0040] The telescopic connector 52 is designed to be length-adjustable according to actual needs. Through the engagement of the locking hole 54 and the barbed clip 55, the optimal connection length can be achieved in different installation environments. This flexibility ensures good electrical contact in various situations. The engagement of the barbed clip 55 and the locking hole 54 effectively prevents accidental loosening of the connector during use, enhancing connection safety and reducing electrical faults caused by poor connections. The threaded connection design makes the connector 5 easy to install and remove, requiring no complicated tools or procedures, saving time and labor costs.

[0041] The grid-connected cabinet 3 includes switching equipment and protection devices. The grid-connected cabinet 3 is connected to the power plant's auxiliary power busbar via a cable, and both ends of the cable are connected to the busbar via connectors. The low-voltage side busbar of the auxiliary power transformer 4 is connected to the AC input terminal of the grid-connected cabinet 3. The auxiliary power transformer 4 is connected to the input terminal of the power plant's auxiliary power system via a cable. The photovoltaic module 1, grid-connected inverter 2, grid-connected cabinet 3, auxiliary power transformer 4, and auxiliary power system are connected via electrical connection devices, and the cables are stably connected via connectors and connectors 5.

[0042] By integrating photovoltaic modules 1, grid-connected inverters 2, grid-connected cabinets 3, plant transformers 4, and the plant power system through electrical connection devices, the power management of the entire system becomes more efficient. This integrated design makes power transmission, conversion, and dispatch smoother, improves system coordination and response speed, and reduces complex connections between components. Grid-connected cabinet 3 includes switching equipment and protection devices, which can promptly disconnect the circuit in the event of a power system fault, preventing damage to other equipment or causing greater impact on the power system. This enhances the safety of the entire power supply system and enables timely fault isolation, ensuring the stability of the power supply. Stable connections of cables and joints are achieved through connectors 5, which not only ensures a robust and reliable electrical connection during power transmission but also facilitates fault diagnosis and maintenance. The stable connection design reduces the risk of failure due to loose or damaged connections, thereby reducing the frequency of system maintenance and related repair costs, and improving the overall reliability of the system.

[0043] The power plant’s roof and parking lot surfaces are equipped with brackets, which are bolted to the roof or parking lot surfaces. The photovoltaic modules 1 are fixed to the brackets by clips or bolts. The grid-connected inverter 2 is installed in the machine room or on the equipment platform and is fixed to the ground by a mounting bracket. The cable connection between the grid-connected inverter 2 and the grid-connected cabinet 3 is fixedly connected by a terminal block.

[0044] By bolting the brackets to the roof or parking lot surface, and using snap-fit ​​or bolt-fixed designs to secure the photovoltaic modules 1 to the brackets, the photovoltaic modules 1 can be ensured to be firmly and stably fixed during long-term use, resisting the effects of external environmental factors such as wind and vibration, thus improving the system's wind and earthquake resistance and enhancing the overall structural safety. The snap-fit ​​or bolt-fixed design of the photovoltaic modules 1 facilitates quick installation and disassembly. Whether installing new equipment, performing routine maintenance, or troubleshooting, it can be done through simple disassembly or re-fixing steps, saving time and manpower. This design makes system maintenance and management more efficient and convenient. The grid-connected inverter 2 is fixedly connected to the cable via wiring terminals, ensuring a stable electrical connection and reducing power loss or equipment damage caused by loose cables or poor contact. A robust electrical connection not only improves power conversion efficiency but also reduces the risk of malfunctions, enhancing the reliability and operational stability of the entire system.

[0045] The photovoltaic power generation system of the gas turbine power plant is monitored and transmitted through monitoring and communication lines, which are connected to the grid-connected cabinet 3 and the plant service transformer 4. The grid-connected cabinet 3 transmits AC power to the power input terminal of the plant service power system through the busbar, and the AC power is connected to other electrical equipment of the power plant through the busbar.

[0046] Real-time monitoring and data transmission of all parts of the photovoltaic power generation system via monitoring and communication lines allows for immediate access to the system's operational status, performance, and the operating data of each device. This enables maintenance personnel to promptly identify potential problems, implement preventative maintenance measures, and avoid sudden failures, thereby improving system reliability. Grid-connected cabinet 3 transmits AC power to the plant's auxiliary power system via a busbar, ensuring that the electricity generated by the photovoltaic power generation system can be effectively connected to other electrical equipment in the power plant. This method allows for the rational allocation of power resources, optimized power usage, reduced energy waste, and ensures a balanced and stable power supply within the power plant. The monitoring and communication lines also ensure effective coordination between the photovoltaic system and the auxiliary power system, enabling timely adjustments to the operating status of each component and preventing power system overload or voltage anomalies. This not only improves system operating efficiency but also reduces safety hazards caused by equipment failures or abnormal conditions, ensuring the security of the power supply.

[0047] Installed capacity and photovoltaic power generation system

[0048] The power plant's distributed photovoltaic grid-connected power generation project has a total installed capacity of 1.31MWp, distributed across 8 rooftops and 2 parking lots, with varying orientations. The photovoltaic system uses 580Wp monocrystalline silicon single-sided single-glass modules, measuring 2278×1134×35mm. Typical rooftop supports employ a vertical, multi-row arrangement, with fixed brackets for the photovoltaic modules. The highest point of each module is 1.2m above the roof panel, and the module tilt angle is 3°, using a herringbone installation method. A total of 12 string-type grid-connected inverters are installed, converting the power to 0.4kV AC, which is then connected to the power plant's 0.4kV auxiliary power busbar using a "self-consumption" approach. The entire photovoltaic system operates on an on-demand power supply principle, with 4 grid connection points that also serve as metering points. No new distribution room is needed; the existing 0.4kV distribution rooms in the water treatment PC and maintenance building PC sections are utilized, with the addition of a grid-connected distribution cabinet connected to the low-voltage side busbar of the low-voltage auxiliary transformer. The photovoltaic power generation access capacity should be reasonably allocated according to the power consumption capacity of the distribution section, so that photovoltaic power generation can be used nearby and reduce the loss of power caused by long transmission lines. See the table below for details.

[0049]

[0050] primary electrical system

[0051] This project has four grid connection points, all connected to the low-voltage side busbar of the low-voltage plant service transformer. The photovoltaic power generation capacity is rationally allocated based on the power capacity of the distribution section, allowing for localized use of photovoltaic power and reducing energy losses caused by long transmission lines. Two grid connection points are located in the material repair workshop's power distribution room, and two more are located in the water treatment workshop's power distribution room. The total four grid connection points are: #1 (material warehouse and repair workshop PC A section); #2 (material warehouse and repair workshop PC B section); #3 (water treatment PC A section); and #4 (water treatment PC B section). See below. Figure 5 As shown.

[0052] Under normal circumstances, the photovoltaic power generation is consumed locally in the 0.4kV section of the distribution room at each access point, without needing to be stepped up to the 6.3kV busbar through the low-voltage plant transformer. If the power generation is not fully consumed, it is transmitted to the 6.3kV busbar through the plant transformer. The cable cross-section meets the requirements, and no additional cables are needed.

[0053] Employing 30kW-110kW photovoltaic grid-connected string inverters, it features impact-free and disturbance-free grid-connected control. It includes grid overvoltage and undervoltage protection, overfrequency and underfrequency protection, grid restoration protection, and anti-islanding protection to ensure the safety of maintenance personnel.

[0054] The 0.4kV grid-connected cabinet is a complete set of switchgear used as a grid-connected metering cabinet, drawing AC power from the AC combiner box of each photovoltaic inverter.

[0055] Cables connect to four grid-connected cabinets each, and then to the 0.4kV busbar on the low-voltage side of the low-voltage plant auxiliary transformer via the main grid-connection switch, connecting to the plant auxiliary power system. The frame circuit breakers can be operated locally / remotely, and remote signaling and measurement data are sent to the DCS system. The primary circuit diagram of the grid-connected cabinets is as follows. Figure 6 As shown.

[0056] Electrical secondary system

[0057] Inverter grid connection protection function

[0058] As a power generation device connected to the grid, the core control of the inverter in this project adopts advanced SVPWM technology. By detecting the grid voltage, it outputs a current with the same frequency and phase as the grid. The current amplitude is controlled by a program and can be proportional to the power of the solar panels. This control method ensures that the grid-connected inverter operates without impacting or disturbing the grid voltage, while also guaranteeing low harmonics and a high power factor in the grid-connected current. In the event of a grid fault causing overvoltage, undervoltage, overfrequency, or underfrequency conditions, the inverter will cut off power supply to the grid and issue a warning signal. The overvoltage and undervoltage protection thresholds are "310Vac-450Vac", and the overfrequency and underfrequency protection thresholds are "47-52Hz", with a tripping time of 0.2s. After the grid voltage and frequency return to normal within 20 seconds to 5 minutes, the grid-connected inverter should automatically reconnect power to the grid. During power reconnection, the output power should increase slowly and should not cause any impact on the grid. The grid-connected inverter has reliable and complete anti-islanding protection. If the power supply to the grid to which the inverter is connected is interrupted, the inverter will stop supplying power to the grid within 2 seconds and issue a warning signal at the same time.

[0059] Grid connection cabinet protection function

[0060] The circuit breakers in the grid-connected cabinet should have instantaneous and long-delay short-circuit protection functions, as well as shunt trip and undervoltage trip functions. The undervoltage trip setting should preferably be set to 20%Un for 10 seconds, and the voltage detection setting should preferably be set to 85%Un. When a short-circuit fault occurs on the line, the line protection should be able to act quickly and trip the circuit breaker instantaneously, meeting the requirement of rapid and reliable fault isolation in the event of a fault across the entire line. The circuit breaker should also have auxiliary contacts that reflect fault and operating status.

[0061] Each 0.4kV low-voltage grid-connected cabinet is equipped with one anti-islanding detection and automatic safety device. It has the ability to quickly detect islanding and immediately disconnect from the grid. Its islanding protection should be coordinated with the grid side protection.

[0062] Metering function

[0063] The project connects to the power grid via a 380V line to the low-voltage side of the original factory transformer; therefore, the metering points are located on the outgoing side of the 380V line. Each grid connection point is equipped with one bidirectional meter with an accuracy of 0.2S and one set of power acquisition terminals, all installed in the low-voltage grid connection cabinet. This project has four low-voltage grid connection points, totaling four metering units and four sets of power acquisition terminals.

[0064] Monitoring system

[0065] Using Huawei PV Cloud (PC version) and Huawei Smart PV APP, this software is a monitoring software without control functions. A monitoring host is installed in the central control room, and monitoring is performed via a backend computer. The mobile APP allows relevant personnel to download and gain access for real-time monitoring. Additionally, it collects switch, protection remote control, signaling, and measurement signals from four grid-connected cabinets and sends them to the DCS system for monitoring. The monitoring host can display the power station's current total generating capacity, daily total generating capacity, cumulative total generating capacity, and daily generating capacity curve in real time.

[0066] Project deliverables: (Benefit calculation)

[0067] Power generation estimation

[0068] The ground-mounted photovoltaic arrays in this project all adopt the fixed bracket operation mode, with a total installed capacity of 1.31MWp.

[0069] The annual power generation of a photovoltaic power station can be calculated using the following formula:

[0070]

[0071] Where: HA — Total solar irradiance (kWh / m²) 2 According to the above-mentioned regional horizontal solar irradiance data table, the annual total horizontal solar irradiance (i.e., peak hours) of this photovoltaic power station is 1424.6 kWh / m². 2 The optimal tilt angle for total solar irradiance (i.e., peak hours) is 1424.6 kWh / m². 2 .

[0072] EP – Grid-connected electricity generation (kWh)

[0073] Es – Irradiance under standard conditions (constant = 1 kWh / m²) 2 )

[0074] PAZ – Component Installation Capacity (kWp)

[0075] K – Overall efficiency coefficient.

[0076] The overall efficiency coefficient is affected by many factors. The specific analysis of the value of the overall efficiency coefficient is as follows: the correction factor for solar incident angle loss is 97%, the correction factor for radiation intensity loss is 98%, the shading loss is 98.0%, the temperature loss is 98%, the component mass loss is 99%, the component series-parallel mismatch loss is 97%, the AC / DC system operating loss is 3%, the grid-connected inverter efficiency loss is 98%, the transformer efficiency loss is 98%, and other losses (fault maintenance shutdown, etc.) are 99%.

[0077] Based on the above analysis, the overall efficiency coefficient of this project

[0078] K = 97% × 98% × 98% × 99% × 97% × 97% × 98% × 98% × 99% × 98.3% * ≈ 81%. Based on data from bifacial monocrystalline silicon, photovoltaic modules are calculated with a first-year degradation of 2.0% and an annual degradation of 0.45% over 20 years.

[0079] The power plant's operating period is calculated as 20 years for photovoltaic power generation. The average annual power generation over 20 years is 1,038,800 kWh, and the average daily power generation is approximately 2,800 kWh. The total power generation over 20 years is 20,776,600 kWh, as detailed in the table below:

[0080]

[0081]

[0082] Calculated at 0.7 yuan per kilowatt-hour:

[0083] Average annual power generation: 1,038,800 kWh × 0.7 yuan / kWh = 727,200 yuan

[0084] The average annual power generation benefit is 72.72 yuan / year.

[0085] Based on a 20-year service life of the equipment: 20.7766 million kWh × 0.7 yuan / kWh ≈ 14.5 million yuan.

[0086] The average annual power generation benefit over 20 years totaled 14.5 million yuan.

[0087] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A photovoltaic power generation system for a gas turbine power plant, characterized in that, Including: A photovoltaic module, wherein the photovoltaic module is installed on the surface of the power plant roof and parking lot, and the photovoltaic module is fixedly connected to the surface of the power plant roof and parking lot by a bracket and a mounting base; A grid-connected inverter, wherein the grid-connected inverter is connected to the output terminal of the photovoltaic module via a DC cable, and the AC output terminal of the grid-connected inverter is connected to the grid-connected cabinet via an AC cable; The grid-connected cabinet is connected to the power plant's auxiliary power bus and to the output terminal of the grid-connected inverter, and transmits power to the auxiliary power system through the access point. A plant service transformer, wherein the low-voltage side of the plant service transformer is connected to the grid-connected cabinet, and the low-voltage side busbar is connected to the plant service power system of the power plant; A connector is used to connect cables between photovoltaic modules, grid-connected inverters, grid-connected cabinets and plant transformers to realize power transmission between the various components. It includes a first connector, a telescopic connecting line threaded to the first connector, and a second connector threaded to the telescopic connecting line. The telescopic connecting line has a locking hole at its telescopic position and a barbed locking head that engages with the locking hole.

2. The photovoltaic power generation system for a gas turbine power plant according to claim 1, characterized in that, The photovoltaic module includes several unit modules, each of which is fixed to the roof surface or parking lot surface by a bracket. The photovoltaic modules are connected to each other by series or parallel cables to achieve electrical connection.

3. The photovoltaic power generation system for a gas turbine power plant according to claim 2, characterized in that, The grid-connected inverter is a string inverter, which is connected to different photovoltaic module groups via cables. The AC output terminal of the inverter is connected to the access terminal of the grid-connected cabinet via a cable.

4. The photovoltaic power generation system for a gas turbine power plant according to claim 3, characterized in that, The grid-connected cabinet includes switching equipment and protection devices. The grid-connected cabinet is connected to the power plant's auxiliary power busbar via a cable, and both ends of the cable are connected to the busbar via connectors.

5. The photovoltaic power generation system for a gas turbine power plant according to claim 1, characterized in that, The low-voltage busbar of the plant service transformer is connected to the AC input terminal of the grid-connected cabinet, and the plant service transformer is connected to the input terminal of the power plant's power system via a cable.

6. The photovoltaic power generation system for a gas turbine power plant according to claim 5, characterized in that, The photovoltaic modules, grid-connected inverters, grid-connected cabinets, plant transformers, and plant power systems are connected by electrical connection devices, and the cables are stably connected by joints and connectors.

7. The photovoltaic power generation system for a gas turbine power plant according to claim 6, characterized in that, The power plant's roof and parking lot surfaces are equipped with brackets, which are bolted to the roof or parking lot surfaces. The photovoltaic modules are fixed to the brackets by clips or bolts.

8. The photovoltaic power generation system for a gas turbine power plant according to claim 7, characterized in that, The grid-connected inverter is installed in the computer room or on the equipment platform and is fixed to the ground by a mounting bracket. The cable connection between the grid-connected inverter and the grid-connected cabinet is fixedly connected by a terminal block.

9. The photovoltaic power generation system for a gas turbine power plant according to claim 1, characterized in that, The photovoltaic power generation system of the gas turbine power plant is monitored and transmitted through monitoring and communication lines, which are connected to the grid-connected cabinet and the plant transformer.

10. The photovoltaic power generation system of a gas turbine power plant according to claim 1, characterized in that, The grid-connected cabinet transmits AC power to the power input terminal of the plant power system via a busbar, and the AC power is connected to other electrical equipment in the power plant via the busbar.

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