Definition of smart photovoltaic power plant solutions
Huawei's smart PV power plant solution is to make the power station as a customer-oriented product, from the power station construction to the operation and maintenance of the entire process to optimize and innovate, the digital information technology and photovoltaic technology cross-border integration, to achieve the initial investment without increasing the premise Reduce the initial investment, reduce the operation and maintenance costs, increase the system's power generation, and increase the return on investment.
Compared with the traditional power station solutions represented by centralized large-scale machines, the intelligent photovoltaic power station solution has three significant differences in design concept. One is digital photovoltaic power station, the other is simpler power station, and the third is global automation operation and maintenance.
Digital photovoltaic power station: Firstly, the existing photovoltaic power generation part is intelligently transformed, so that the traditional inverter is not only a power generation component, but also a power conversion, remote control, data acquisition, online analysis, and environmental adaptation. The integrated intelligent controller becomes the center of the nerve endings and regional control of the power station. Secondly, through the upgrade of the existing low-speed transmission channels such as RS485, the entire power station forms a high-speed interconnection of converged voice and video communication, fast and flexible deployment, and maintenance-free. Network, laying highways with power station information circulation; Finally, the complete information of the collected power stations is uniformly uploaded to the cloud storage, and the big data analysis and mining engine is used to realize the intelligent management of the power station and the continuous optimization of the power station performance.
Make the power station simpler: no redundant facilities such as inverter room, DC combiner box, no fragile parts such as fuses and fans, and simple and standardized delivery of power stations. All components of the power station can meet the wind, salt spray and high temperature. Wet, high altitude and other complex environments, 25 years of maintenance-free, reliable operation of quality requirements, construction and operation and maintenance is more simple, to maximize customer protection.
Global automation operation and maintenance: In addition to the attention to initial investment and power generation, with the increase of the scale of power storage, the distribution of power stations is becoming wider and wider, and the importance of power station operation and maintenance in the 25-year life cycle is gradually increasing. With the digital photovoltaic power station platform, the intelligent photovoltaic power station solution provides global, integrated, and full-process automation management and operation and maintenance methods to improve operation and maintenance efficiency, reduce operation and maintenance costs, and enable global mass operation and maintenance. Play a large-scale operational effect.
Through the innovative concept of fully digital power station, simpler power station and automatic operation and maintenance, we will create a smart, efficient, safe and reliable intelligent photovoltaic power station solution, and ultimately maximize the value of power plant holding and operating customers.
Technical characteristics and customer value
Compared with traditional power plants represented by centralized large-scale machines, smart photovoltaic power plants have a series of advantages such as not increasing system investment, high return on investment and availability, which are manifested in the following aspects:
1. Do not increase the initial investment. Because of the simple design, the intelligent photovoltaic power station has no DC combiner box and DC power distribution cabinet, no civil construction machine room, simple component installation, etc. The initial investment cost is not higher than the traditional photovoltaic power station. At the same time, because the intelligent photovoltaic controller (string inverter) is small in size, light in weight and standardized, it can be mass-produced through automated assembly lines, and the labor cost is relatively small, which has obvious scale advantage.
2. The internal rate of return of the intelligent photovoltaic power plant IRR is increased by more than 3% compared with the traditional power station. Due to the adoption of advanced technologies such as multi-channel MPPT and multi-peak tracking, the impact of PV array loss such as component attenuation, shadow occlusion, inconsistent construction and installation, inconsistent terrain, and DC voltage drop is effectively reduced. The performance of the system PR (PerformanceRatio) is over 82%. Compared with the traditional scheme, the average power generation increased by more than 5%, and the internal rate of return IRR increased by more than 3%.
3, 25 years of reliable operation of the system maintenance-free design. The intelligent controller adopts IP65 protection level to achieve internal and external environmental isolation, keep the device in a stable operating environment, and reduce the influence of temperature, sand, salt spray and other external environments on the life of the device; the system has no wearing parts, no fuse Fans and other devices need to be replaced regularly to achieve system-free maintenance. Learn from the design and quality management experience of global mass shipment and deployment of Huawei communication base station products, 25-year reliability design and life simulation from device to system, plus strict verification Testing ensures that system components do not need to be replaced throughout their life cycle, and are reliable and economical.
4. The actual utilization rate of installed capacity of photovoltaic power stations is high. The average annual number of failures of smart PV power plants is 30%. The impact of system failures on power generation is only 1/10 of the traditional solution. The maintenance cost outside the warranty period is only 1/5 of the traditional solution. The traditional photovoltaic power station is essentially a series system. The failure of any component such as DC combiner box, DC power distribution cabinet, engine room heat dissipation and auxiliary source power supply equipment, inverter large machine, etc. will cause some or all of the photovoltaic power generation loss. Due to the need for professional maintenance, the repair cycle is long and the cost is high. The intelligent photovoltaic power station has a simple structure and is essentially a distributed parallel system. The failure of a single inverter does not affect the operation of other equipments, and it is greatly improved due to its small size, light weight, and spare parts on site. The availability of the system.
5. Group-level intelligent monitoring and multi-channel MPPT tracking technology ensure that the power station is “visible, reliable, manageable and controllableâ€. The intelligent photovoltaic power station performs independent voltage and current detection on each input string of the input, and the detection accuracy is more than 10 times that of the traditional intelligent combiner box solution, which lays a foundation for accurately locating the string failure and improving the operation and maintenance efficiency. Multi-channel MPPT technology can reduce the power generation of flat terrain by more than 5% due to the effects of low occlusion, dust and string mismatch; it reduces the impact of different orientations and shadow occlusion in roof and mountain power stations, and the power generation capacity increases by 8-10%. Used in conjunction with the tracking system, the tracking controller is integrated with the controller to enable independent tracking of the bracket, increase power generation, and the intelligent controller and tracking bracket become the best companion.
6. The intelligent photovoltaic power station is “upgradable and evolvingâ€. When the component technology advances and the operating environment changes, the software of the intelligent controller can be remotely upgraded online, backward compatible design, etc., without the need to replace the online running equipment, the algorithm can be upgraded to enjoy the latest technological achievements, and maximize the reuse. Existing equipment.
7. Intelligent active grid adaptive technology achieves grid friendliness. Utilizing the advantages of high-speed processing capability, high sampling and control frequency, and control algorithms of the intelligent controller, it actively adapts to changes in the power grid and better realizes parallel control of multiple machines. Better grid-connected harmonic quality, better meet grid access requirements and improve adaptability in harsh grid environments.
8, active security. Reduce the distance of DC transmission and achieve active safety. The safe transmission and protection of DC is the key point and the difficulty. The intelligent photovoltaic power station adopts the DC-free bus design. The DC power output from the string directly enters the inverter and is converted into AC power for long-distance transmission. It actively avoids the safety and protection problems brought by DC transmission and reduces the safety hazard caused by DC arcing. Make the power station safer.
9. Safely circumvent the PID effect. The component power attenuation caused by PID will greatly affect the investment income. The intelligent controller automatically detects the potential of the component and actively adjusts the working voltage of the system so that the negative pole of the battery board does not need to be grounded, and the positive pressure is applied to the ground to effectively avoid the PID effect. Since the negative electrode of the battery board does not need to be grounded, and the residual current monitoring circuit inside the inverter can cut off the circuit within 150ms when the leakage current is greater than 30 mA, the active safety is realized.
10, intelligent and efficient operation and maintenance. Globalized, tiered deployment of power station management and operation and maintenance systems, so that power stations deployed in different locations are logically managed as a power station. The headquarters can grasp the operation status and revenue comparison of each power station globally, and lay the foundation for assessment and management improvement. Power stations distributed throughout the country can carry out large-scale inspections through drones. First-line personnel can realize real-time interaction with video, voice, location and fault information of the expert operation and maintenance team at headquarters through customized operation and maintenance intelligent terminals. The front and rear remote cooperative operation and maintenance, reduce the skill requirements of the first-line operation and maintenance personnel, maximize the reuse of the headquarters expert resources, achieve the optimal configuration of personnel, and improve the maintenance efficiency of the system.
11. The introduction of big data analysis engine and expert operation and maintenance system, timely discover potential defects and explore the space for revenue improvement. Through real-time data collection, cloud storage and online expert analysis systems, the power station can automatically check the health, and provide maintenance recommendations based on maximum revenue, such as cleaning recommendations, parts replacement and maintenance recommendations, to achieve preventive maintenance; accumulate long-term operational data, comprehensive Analyze the natural environment, such as temperature, irradiation and other environmental factors, through the online adjustment or software upgrade of the intelligent control unit algorithm, so that the system components in the different environments operate in the best matching state, to maximize the benefits.
12. Smart photovoltaic power plants are environmentally friendly. The intelligent controller has no fan design and achieves low ambient noise of 29dB. It does not require a civil machine room to reduce environmental damage such as vegetation and soil. The electromagnetic radiation is small and protects human health. The intelligent photovoltaic power station realizes the harmonious coexistence between people and the environment, greatly increases the scope of application of photovoltaic power stations, and creates conditions for photovoltaic households.
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