Huawei photovoltaic inverter ranks the top ten in the list of photovoltaic inverters. Do you know what technologies and strengths Huawei has for PV inverters? What are the classifications? This article first introduced the classification of Huawei's PV inverters, followed by the inventory of 16 black technologies on Huawei's PV inverters. 1. Centralized inverter The centralized inverter technology is that if thousands of parallel PV strings are connected to the DC input of the same centralized inverter, the power of the three-phase IGBT power module is generally high, and the power is smaller. The DSP conversion controller improves the quality of the power produced, making it very close to a sinusoidal current, and is typically used in systems with large photovoltaic power stations ("10 kW"). The most important feature is that the power of the system is high and the cost is low. However, because the output voltage and current of different PV strings are often not completely matched (especially when the PV strings are partially blocked due to cloudyness, shade, stains, etc.), the centralized inverse is used. Changing the way will lead to a decrease in the efficiency of the inversion process and a drop in electricity consumption. At the same time, the reliability of power generation of the entire photovoltaic system is affected by the poor working condition of a certain photovoltaic unit group. The latest research directions are the use of space vector modulation control and the development of new inverter topology connections to achieve high efficiency under partial load conditions. 2. String inverter The string inverter is based on the modular concept. Each PV string (1-5kw) has a maximum power peak tracking at the DC end through an inverter, and the parallel connection at the AC end has become the current international The most popular inverter on the market. Many large-scale photovoltaic power plants use string inverters. The advantage is that it is not affected by the module differences and shading between the strings, and at the same time, the mismatch between the best working point of the photovoltaic module and the inverter is reduced, thereby increasing the power generation. These technical advantages not only reduce the system cost, but also increase the reliability of the system. At the same time, the concept of “master-slave†was introduced among strings, making it possible for the system to link several groups of photovoltaic strings together to make one or several of them work when a single string of electrical energy cannot make a single inverter work. , which will produce more electricity. The latest concept is that several inverters form a "team" to replace the concept of "master-slave" and make the reliability of the system go one step further. At present, transformerless string inverters have taken a dominant position. 3, micro inverter In the traditional PV system, the DC input of each string inverter is connected in series by about 10 photovoltaic panels. When one of the 10 series panels does not work well, this string will be affected. If the inverter uses multiple inputs with the same MPPT, each input will also be affected, significantly reducing power generation efficiency. In practical applications, the above factors are caused by clouds, trees, chimneys, animals, dust, ice and other obstructing factors, and the situation is very common. In the PV system of the micro-inverter, each panel is connected to a micro-inverter. When one of the panels cannot work well, only this module will be affected. Other photovoltaic panels will operate in optimal working conditions, making the overall system more efficient and generating more power. In practical applications, if the string inverter fails, it will cause several kilowatts of panels to fail to function, and the impact of micro-inverter failures will be quite small. 4, power optimizer The addition of a power optimizer (OptimizEr) to the solar power system can significantly increase the conversion efficiency and simplify the function of the inverter to reduce costs. To realize a smart solar power system, the device power optimizer can really make every solar cell play its best performance and monitor the state of battery wear at any time. The power optimizer is a device between the power generation system and the inverter. The main task is to replace the original best power point tracking function of the inverter. The power optimizer performs extremely fast tracking of the best power point by analogy by simplifying the circuit and a single solar cell, that is, corresponding to a power optimizer, so that each solar cell can truly achieve the best power point tracking. In addition, the state of the battery can be monitored at any time by placing a communication chip at the same time, and the problem of immediate payback allows relevant personnel to perform repairs as quickly as possible. 1. The largest unmanned logistics center in Asia, with a few exceptions, most have realized the concept of industrial Internet of Things. Has three industrial production leading technologies: automation technology, bar code technology, radio frequency RF equipment to achieve paperless management. 2. The overall data collection accuracy of China's photovoltaic power stations is about 3%. This figure is 0.5% in Huawei. 3. Remove the wearing parts, remove the container or inverter house, and integrate them into the inverter. Intelligent photovoltaic terminals with IP67 degree of protection are not subject to the industry's highest standards. They can be soaked in 1 meter deep water. It was safe and sound for hours and it was turned into a harsh environment for photovoltaic power plants. 4, the industry's most stringent quality certification test. Its own 10m microwave darkroom electromagnetic compatibility test, accelerated life aging test, harsh collection of dust, temperature, humidity, altitude and an integrated pressure test, shocked rocket lightning testing, the only anti-15 typhoon test, Inverters are considered to be qualified if they do not enter the water in the typhoon, so they can naturally prevent dust. 5, Lean production, 6 Sigma quality level, a screw has a machine test and two people check, a bar code link has never been wrong for eight years. 6, directly to the company's leadership to send the order to be issued, paperless office, and the operation and maintenance team's response time and work completion assessment. The operation and maintenance team will no longer fall into the dilemma of “no bosses feel that they have no workâ€. 7. The FusionSolar system can directly output the power generated by all the power plants of a company. Compared with the estimated power generation, it can see the impact of parts, weather, and operation and maintenance on the power station. The concept of “operation†is added to the management system, allowing Investors are better able to analyze whether this company, which is an independent power provider (IPP), is “fairâ€. 8, PLC technology and 4GLTE wireless technology replace the traditional RS485 and optical fiber, a small box can cover 10 kilometers range, do not have to dig buried trench. The mobile internet within the power station is the only one that saves 2 cents per watt. 9, "0-Touch" operation and maintenance, so that the real "human liberation." 10, industry-leading cloud service hardware and operating platform, high-performance blade server, so that cloud center management, big data storage, mining and analysis more reliable, stable, and fast. 11. Huawei's KPI analysis system with the power station PR as the core implements quantitative assessment of people, events (alarm processing, ticket processing, etc.) and equipment; through 5 points and 4 stages, loss analysis is carried out layer by layer to find power stations. Parts and loss of abnormal parts, active analysis, increase power generation. 12, using a unique heat dissipation concept, plus soaking design technology, thermal isolation, thermal shielding technology, to achieve no external fan. The long-term and stable application of heavy sand and dust from the Northwest Plateau and the strong corrosive environment in Hainan Province ensured the lifetime of the device and provided better overall reliability and protection. 13. In the recent China Jianwen China Efficiency Awards, the SUN2000-40KTL model topped the pack and won the top inverter with 98.41% of “China Efficiencyâ€. 14. Every month, Toyota's retired experts visit the factory. Currently, the entire factory is highly automated and standardized. What is most impressive is the robot robot MO's automatic shipping robot in the shape of "Robot Story". It automatically sends raw materials to the workshop according to the magnetic induction line, which makes people feel embarrassed. However, the “Dream Water Village†used to remind employees to pay attention to their voices exposed the true age of the engineers’ uncles. 15. The most powerful global procurement channel, Huawei's parts procurement costs are the lowest in the world. 16. Other companies are still studying how to sell products. Huawei has used big data to study how to increase the viscosity of customers. After Huawei proposes a fully connected world, photovoltaic inverters, after-sales services, and even business-centers, Big Data, will be the most valuable intangible assets of power plants in the future.
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