Silicon enters the copper retreat and opens the era of smart photovoltaic power plants
"Huawei brings digital information technology to the renewable energy industry and realizes the integration of two industries from specific products. It will greatly promote the rapid development of smart power stations, smart grids and even smart energy, and will be renewable from China to China. Energy major countries have made important contributions to becoming a strong renewable energy source."
According to relevant plans, in 2014 China's installed photovoltaic capacity will reach 14GW, of which distributed power stations will account for 8GW.
However, all parties in the market are generally not optimistic about whether this goal can be achieved. The factors constraining the development of distributed photovoltaic power plants are nothing more than a few old ones—financial difficulties, difficulties in network integration, and low yields.
In this regard, industry insiders who specialize in the design of photovoltaic power plants believe that although the above problems are mostly caused by institutional mechanisms, changes in the system are a slow process. For the development of the industry, the most realistic solution is to increase The major technological innovations are to gradually solve these problems with technological progress.
“For example, the most fundamental reason for the difficulty of grid connection is still the inherent nature of photovoltaic power generation, which is unstable and intermittent. This is doomed to be not “friendly†to the existing grid. How to turn it into a friendly power supply for the grid? At least, it should be technically considered how to suppress the generation of harmonics as much as possible,†said the person in the industry.
For financing problems, the biggest hope in the industry is to realize asset securitization of power plants. However, this also requires a premise that the operation and maintenance of the photovoltaic power station can be monitored in real time and data can be viewed in real time.
Behind the above system problems, actually involves a larger proposition - the intelligentization of photovoltaic power plants. This may require the full integration of digital information technology and energy technologies.
As a well-known enterprise spanning both digital information technology and power electronics technology, Huawei Technologies Co., Ltd. is making beneficial attempts in the intelligentization of photovoltaic power plants, and the inverter serves as the main medium for achieving this goal.
"Based on the in-depth consideration of the operation of photovoltaic power plants, we put forward the product design concept of 'silicon-in-copper-retreat' and the customer's value proposition of 'smart-PV power station'. The 'silicon-in-copper-retreat' can make the volume and weight of the inverter much larger. Reduced, and easy to reduce costs through technological innovation and large-scale manufacturing.At the same time, through the introduction of chips and software, each inverter has become a 'brain', which created the era of intelligent management of photovoltaic power plants: can be for each The input of the string is intelligently detected and intelligently handled. The data is reported to the cloud's management center for intelligent operation and maintenance, and it accepts the intelligent dispatch of the power grid,†said Huawei's photovoltaic inverter business unit.
Shi Dingyao, the counselor of the State Council and director of the China Renewable Energy Society, believes that the future renewable energy sources are distributed and intermittent. If we want to better integrate the production and use of renewable energy, we must fully integrate digital information technology and energy technologies. Convergence of smart technology. "Huawei brings digital information technology to the renewable energy industry and realizes the integration of two industries from specific products. It will greatly promote the rapid development of smart power stations, smart grids and even smart energy, and will be renewable from China to China. Energy major countries have made important contributions to becoming a strong renewable energy source," Shi Dingxi said.
"Silicon goes into copper"
Heat dissipation, conversion efficiency, etc., have always been the most important core indicators in the development of inverter technology.
However, in the view of the industry-specific photovoltaic power plant design, with the continuous development of China's photovoltaic applications, especially the development of distributed photovoltaics, it is clearly not enough to pay attention to the above technical indicators, and inverters also need to take on greater functions. Especially in the realization of intelligent interaction with the power grid, smart operation and maintenance monitoring of the photovoltaic power station in the latter stage, should play a greater role.
“Now many companies have also launched real-time power plant monitoring and management systems, but most of them are independent of the existing photovoltaic equipment, and will face some inconveniences in terms of installation and later-stage services. If the inverters are correspondingly Technological innovation to realize the transition from a relatively single function type to a smart one will be more convenient for power station owners, and also bring value such as high power generation, good power quality, simple construction and installation, and maintenance-free value, he said.
It is based on the realization of the "smart photovoltaic power plant" this major goal, Huawei put forward the "silicon into copper retreat" product design concept.
Here, "copper" refers to power electronic components such as capacitors and inductors, and its development is relatively stable. "Silicon" refers to digital information components represented by chips and software. “Silicon copper retreat†is to increase the use of “silicon†components such as chips and software, and through more precise power conversion and control techniques such as multilevel, the output AC waveform is smoother, and the “copper†components such as capacitors and inductors are reduced. Quantity and capacity.
Due to the reduction in the number and capacity of "copper" components, "silicon-in-copper" makes the size and weight of the inverter much less, and it is easier to reduce costs through technological innovation and large-scale manufacturing.
"Group" advantages
It is understood that Huawei has launched its new product based on the design concept of "silicon-in-copper-retreat" products-a string inverter.
According to Huawei, compared with traditional centralized inverters, string inverters have advantages such as higher power generation, safer and more reliable, lower operation and maintenance costs, and sustainable service customers.
In terms of increasing the amount of power generated, “the use of multi-channel MPPTs for string inverters can reduce the impact of blockage, dust, and string mismatch, such as morning and evening, and increase power generation by more than 5%. In rooftop and mountainous power stations, the effect of different orientations and shading can be reduced, and the power generation can be increased by 8-10%." Huawei's photovoltaic inverter-related technical personnel said.
In addition, compared with the features such as larger influence surface and long maintenance time after the failure of the centralized inverter, the string inverter has any inverter failure and does not affect the normal power generation of other inverters. And the replacement is simple, ordinary personnel 0.5 to 2 hours to achieve the advantages of replacement.
According to the technical personnel of Huawei's PV inverters, the string inverters are essentially distributed heat dissipation in terms of heat dissipation in the inverter, which avoids the reliability of the devices brought about by the heat concentration of the centralized inverters. Impact can greatly increase product reliability.
From the perspective of warranty period, the warranty period for string inverters in the world is five years and the centralized one is only two years. The huge difference among them is mainly caused by the difference in cooling capacity.
In terms of improving the grid-friendly aspect, Huawei's multi-inverter inverters have a parallel smart grid adaptive function that can actively adapt to the harmonics of the power grid, making THDi better, better satisfying grid access requirements, and enhancing photovoltaics. Power grid friendliness.
For some industrial roof projects, since the string inverter does not have a DC combiner box and its DC cable length is shorter, it can greatly reduce the fire hazard caused by the DC side failure, thereby reducing the potential for factory fire.
In terms of the operation and maintenance of the power station, the data and information management of the entire photovoltaic power station can be intelligently transmitted through the wireless pipeline, and the health inspection of the power station can be realized, reducing the cost of maintenance of the artificial station.
In the book "The Third Industrial Revolution", Jeremy. Rifkin described to the world a new and dynamic economic prospect - the perfect combination of information technology and renewable energy, will resolve the resource dilemma faced by mankind. At present, although domestic PV power plants have different investment purposes, most of them do not have the concept of refined management and operation and maintenance. In addition, Huawei has been working hard for many years in the fields of digital technology and power electronics, and has achieved great success. Bringing the weather, geographical advantages and people, and Huawei's deep intervention, it is like a natural gene with full wings, will inject a new driving force for the development of science and technology innovation for the global photovoltaic industry.
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