With the photovoltaic power generation industry, the continuous development of new energy, the inverter and power generation system as an integral part of becoming a new industry forms. Inverter for domestic products in the market competitive situation, in the collection of a large number of products based on the domestic counterparts, conducted comparative analysis of similar products, and pointed out the main differences between similar products and development. Energy is the social and economic development of human civilization and the basic impetus, the energy crisis and environmental pollution problems have become increasingly severe, the world regard the development and use of sustainable clean energy as a future energy development strategy, including solar energy to clean pollution-free, no geographical boundaries , inexhaustible and other unique advantages and become one of the focuses of attention. Photovoltaic solar power is currently one of the main application mode. Inverter with solar photovoltaic power generation system, the core component of solar energy through photovoltaic modules into DC power, and through the grid to DC power inverter into the grid the same frequency, same phase sine wave current fed into the grid, so green, clean and efficient solar energy for human services. 2 domestic photovoltaic inverter products Status Photovoltaic inverter manufacturers, including major foreign SMA, Fronius, Kaco, Shap and so on. SMA is the world's oldest and largest manufacturer of photovoltaic inverters to the foreign representative SMA PV inverter manufacturers started early, mature technology, the global PV industry leader in technology innovation and development of varieties of products currently and more series of all, stability, reliability and conversion efficiency than higher; foreign products is also characterized by high intelligence, its based on the practical application of PV systems, to develop a high degree of intelligence Photovoltaic Inverter products, and with the monitoring system, power distribution protection system to form a functional photovoltaic power generation system. Domestic production of many inverter manufacturers, but specializing in photovoltaic power generation system inverter manufacturers are not many, many car manufacturers to the original inverter, inverter communications, power inverters, UPS and other power technology, began to engage in the production of PV inverters and research and development, as many domestic enterprises in the inverter industry has years of experience, has a certain scale and competitiveness. Domestic production of the PV inverter manufacturers include: Hefei Light, Beijing Corona, Beijing claims the British, Nanjing Guanya, Zhicheng Champion, Shanghai Yingwei power and new energy. Table 1 lists the domestic photovoltaic inverter main manufacturers and their main product categories. Photovoltaic power generation project is the main PV inverter applications, most of the current photovoltaic power generation projects in the demonstration phase, and more concentrated in Beijing, Shenzhen, Shanghai and other economically developed cities, as the technology matures and national policies support, the next light will be abundant in central and western regions. 3 domestic photovoltaic inverter main product analysis Photovoltaic inverter can be divided into two major categories of centralized and distributed. Centralized network against domestic and Table 1, the major domestic manufacturers of photovoltaic inverters Electrical, Guanya, Zhicheng Champion and so is centralized and inverter manufacturers, but the scale and variety series, etc. are not Sungrow; Shanghai Yingwei edge technology has taken the traditional centralized grid-connected inverter the development of different ideas, is the first micro-development of distributed grid-connected solar inverter company. The following were the power of the sun new energy supply and Yingwei represented on the two types of grid-connected inverter products for analysis. The photovoltaic sun power inverter and power station were divided into groups based string type, belong to the centralized grid-connected inverter, centralized grid inverter series-parallel connection of multiple PV modules combined to form a high enough voltage or power, in the uniform grid by the inverter. Group of string-type photovoltaic inverter for small PV systems, power plants and photovoltaic inverter for medium-sized photovoltaic power generation system, the main characteristics of their products are as follows: 1) Power rating: group string type 1.5kW ~ 10kW, power-type 30kW ~ 1MW; 2) Input voltage: 150V or more group of string type, power type of 450V or more; 3) Output Voltage: 220VAC, 380VAC; 4) The maximum conversion efficiency: 94.5% to 95%; 5) Maximum Power Point Tracking (MPPT) efficiency: 99.9%; 6) communication and protection: perfect; Yingwei Power New Energy Technology (Shanghai) Co., Ltd. was founded in 2008, is the first, is the only independently developed a micro-inverter PV Grid company. Micro-Inverter technology PV modules through a separate block for each match a separate DC / AC conversion function and the MPPT function of the inverter, a single block of PV modules to achieve the maximum power generation efficiency. Yingwei force micro-inverter performance characteristics of products are mainly as follows: 1) Power rating: PV modules with a single block matching, 180W ~ 300W; 2) Input voltage: PV modules with a single block matching, 20V ~ 40V; 3) Output Voltage: 220VAC; 4) The maximum conversion efficiency: 95%; 5) Maximum Power Point Tracking (MPPT) efficiency: 99.9%; 6) communication and protection: perfect; Centralized PV grid-connected inverter start early, complete product line, is the PV inverter market mainstream products, occupy a dominant position, but as the technology matures and the continuous development of commercial applications, centralized light V grid system problems have gradually attracted attention: (1) Reliability: a centralized grid-connected PV systems, inverter is the key to the whole system is weak, a single inverter effectiveness will lead to the collapse of the whole system; (2) MPPT tracking efficiency: While most concentrated photovoltaic inverter manufacturers claim that tracking efficiency can reach 99.9%, in fact, because of its MPPT tracking for the entire PV array, not take into account each PV module, the module match, partial occlusion and other factors caused the power loss is very substantial; (3) System scalability: a centralized system decide that the system scalability is poor. Distributed Micro-Inverter technology for centralized grid-connected solar inverters made the existing problems and developed, and its late start, the product line is not yet complete, is still in its infancy, but the current product technology performance point of view, micro-inverters in no way inferior to the traditional centralized inverter products, even better than a centralized inverter products. Through direct micro-inverter PV modules with a single block is directly connected to a single block of PV modules can achieve a true MPPT, to maximize the efficiency of photovoltaic power generation components, their installation, expansion of flexible, plug and play, modular production can be achieved, micro-inverter manufacturer PV manufacturers with United, as the inverter PV modules tailored to speed up their business and marketization process. 4 Conclusion 1) With the development of solar photovoltaic technology, solar inverter technology matures, maturing product line, able to adapt to application requirements of different power levels; 2) the traditional centralized grid-connected inverter start early, more mature, is providing a certain amount of promotion and application of a dominant position in the market; 3) distributed micro inverter technology started late, but the rapid development of technical indicators have been the main products to work with the centralized grid-connected inverter is comparable or even better than the centralized inverter; 4) distributed micro inverter technology has broad prospects, especially for city construction and other applications of photovoltaic, micro-inverter technology and the combination of PV modules manufacturer, will greatly accelerate the further micro-inverter technology development, and increase its market share.

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