The rise of microgrid will greatly increase the demand for driving power and communication components. The microgrid is a key role that connects the main power grid with the renewable energy system, which helps to improve the distribution efficiency of the overall power grid. Recently, it has rapidly emerged in advanced countries such as Europe, America, and Japan. Since the microgrid must have functions such as real-time monitoring, bidirectional power control, regional power forecasting and coordination, etc., it will lead to the introduction of communication modules, high-speed switches and isolated power components.
Zhang Yongrui, head of the Intelligent Network Group of the Nuclear Energy Instrument Group of the Nuclear Energy Research Institute, said that the power supply of the renewable energy system fluctuates dramatically and must be successfully integrated into the main grid through the DC-AC conversion mechanism. Once the application ratio increases, it will cause Problems such as voltage fluctuations and poor frequency stability of the main grid; therefore, as the penetration rate of renewable energy in various countries continues to increase, it is also necessary to cooperate with the development of a microgrid pilot program combining the main grid, solar energy and energy storage systems to ensure the quality of power supply.
Zhang Yongrui, head of the Intelligent Network Group of the Nuclear Energy Instrument Group of the Nuclear Energy Research Institute, said that the United States and Japan are also actively developing microgrid-related specifications, but the timetable for the publication of the standards has not yet been disclosed.
At present, Europe, the United States and Japan are accelerating the deployment of microgrids. The main reason is that the total power generation of solar systems installed in Europe has accounted for more than 40% of the overall grid, and the average power generation ratio has also approached 10-20%. The proportion of energy power generation has also exceeded 10%, and it is planned to double to 20% in 2020. As for Japan, in response to the concept of non-nuclear homes, it actively promotes renewable energy construction projects.
Zhang Yongrui also revealed that the United States is progressing the fastest at this stage, and has recently released the microgrid research plan from 2013 to 2015, and has set up six pilot operation demonstration areas as a touchstone for the full implementation of the Smart Grid in the future.
It is reported that the power grid can be divided into four uses for generation, transmission and distribution. Among them, the main role of the microgrid is responsible for the middle and rear management of power distribution and power consumption, and the coverage capacity is roughly in the range of 100kW ~ 5MW, which is equivalent to a thousand household level regional power grid. It combines DC power systems such as solar energy and energy storage, as well as the main AC power grid, so it focuses on power switching, bidirectional control, network management and grid isolation protection mechanisms. It has different requirements from traditional grid or general solar system components, and is expected to drive new Demand for power semiconductors and networking modules.
Zhang Yongrui pointed out that the power conversion and control equipment in the microgrid must import power semiconductors with resistance to thousands of UHV, topologies that support real and virtual power compensation and LVRT functions, and high-order pulse width modulation (PWM) control components. When a large amount of direct current surges into the main power grid, the grid-connected state is automatically released and switched to the island operation mode, and it is directly powered by solar energy or energy storage equipment to ensure the normal operation of the power distribution mechanism.
In addition, the microgrid infrastructure must also use real-time power line communication (PLC) technology, ZigBee or wireless local area network (Wi-Fi) communication modules to monitor and report regional electricity, renewable energy and energy storage system power information in real time to It is beneficial to carry out distribution dispatching and give full play to the smart energy management benefits of microgrids.
Obviously, the importance of microgrid deployment has surged, and related power semiconductor and communication module suppliers will all benefit. Zhang Yongrui also mentioned that as the microgrid technology matures, the system architecture will become more and more complicated, such as the parallel design of multiple distributed power sources such as solar energy, wind power and fuel cells, or further integration with the smart grid to develop large-scale energy management in smart cities Solutions, etc., will require more emerging semiconductor technology support, detonating another wave of huge business opportunities.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier Air Cleaner is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
Air Purifier with carbon filter
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