1 network communication provides a common data access control service

Conclusion:

Stopwatch (AMR) replaced the power supply company staff enter a meter reading program, realize the automatic meter reading.

From the power line communications in the early days of the concentrated a stopwatch application to now, smart meter industry has experienced a long developing process.

Today, power line communication technology is widely used in micro inverter solar and other renewable solar grid tie inverter system, electric vehicles charging concentrator, smart grid, smart meters, temperature controller, home automation, factory automation, street light control and so on.

Smart Meters to today's smart grid development is an important milestone in the history of the development of power industry, many organizations and services to industrial group is working on smart grid services general communication protocol, for example, open electric meter project, Meters and More federation and PRIME industry alliance (large European power supply company was set up, including the Enel /, Endesa and Iberdrola, established purpose is promotion and maintenance after the widespread use of on-site inspection of power line communication technology), IEEE P1901.

2 (IEEE working group on new narrowband power line communications within the organization) and the largest broadband power line communication workgroup HomePlug alliance.

Shandong taian's first residents distributed photovoltaic grid-connected power generation project

On June 4, 10 16 points, shandong TaiAnShi DaiYueOu dawenkou town south west Zhang Chuanyang remote village home 3 kw distributed grid photovoltaic power project successfully incorporated into taian, as taian company successful accept the first residents distributed grid-connected photovoltaic (pv) projects, marked the TaiAnShi distributed inphotovoltaic (pv) power project "into" the ordinary people.

On June 4, 10 16 points, shandong TaiAnShi DaiYueOu dawenkou town south west Zhang Chuanyang remote village home 3 kw distributed grid photovoltaic power project successfully incorporated into taian, as taian company successful accept the first residents distributed grid-connected photovoltaic (pv) projects, marked the TaiAnShi distributed in photovoltaic (pv) power project "into" the ordinary people.

Zhang Chuanyang is a teacher of shandong agricultural university, for the rural comprehensive utilization of solar energy research, in his hometown of 12 pieces of polycrystalline panels installed on the roof, interconnection capacity of 3 kw, given operating mode for the "spontaneous for private use, electricity on the Internet", annual output can reach 4300 KWH.

Company is in taian city, shandong province, according to state grid corporation has issued for single and points total installed capacity of less than 6 megawatts of power generation projects give free online services and other related policies and the shandong electric power group company distributed photovoltaic projects grid service management regulations (try out) "and other rules and adhere to optimize the structure of power grid, promote energy conservation and emission reduction, construction of taian" happiness "as the objective, set up covering accepts an application, the interconnection scheme formulated, hooked up to the acceptance, power trading, and electricity contract agreed, grid scheduling and coordination mechanism, comprehensive, all-round, whole process service for the customer provide free on-site investigation, access system scheme establishment, hooked up to the acceptance and efficient services.

Market cycle mutations make photovoltaic industry have been mixed

Following the U.S. anti-subsidy and anti-dumping sanctions imposed on China's pure sine wave inverter products, after the eu market is followed by a "double inverse" survey, export a photovoltaic (pv).

The personage inside course of study reminds, in Europe and the United States capital of Chinese photovoltaic assets into mergers and acquisitions in the trough at the same time, the increase in domestic marketing may be the time.

Capacity of negative tired, tight photovoltaic industry with "double reverse" survey

In 2004 after six years, China's pv industry ushered in a golden development period, suntech, sai d, yingli and trina emerge a batch of leading enterprises, become the global pv industry as a whole scale short term first.

But after the financial crisis, the photovoltaic panels by 35 RMB per watt quickly fell to less than 20 yuan, after all the way down.

Beginning in the second half of 2009, as the "golden sun" project started, solar inverters situation again, the market appeared in short supply "has the capacity to make money".

In capacity expansion at the same time, the whole photovoltaic industry chain technology and product quality basic synchronization with Europe and the United States, 3/4 of the products and prices, the cost is just Europe and the United States.

But "disorderly like destined to bring round of industry shuffling", be engaged in product marketing of shandong linuo solar power holdings brand planning department minister WeiZhao said, since the second half of 2011, influenced by the European debt crisis, coupled with Europe and the United States "double reverse" survey, the heavily dependent on European and American markets again hit China's pv industry.

By the end of 2012, photovoltaic panels price dropped to $5 per watt.

According to America's China photovoltaic products "double reverse" final results, the United States to China related production and export enterprises in between 18.32% to 249.96% of anti-dumping duties, as well as countervailing duties of between 14.78% and 15.97%.

Followed by the European commission's announcement said, has imported from China pv enterprises of wafers, cells, components, start the countervailing investigation.

This year the market demand will be strong, especially in the first half of the order is not sad.

@ chasing new energy electric company Feng Wei: in fact, benefit from the price advantage, in the domestic enterprise main inverter market situation, expanding domestic capacity, has boosted the demand for domestic photovoltaic inverter.

For high sine wave inverter inverter market, although the price of product will decline, but because of market demand to expand, high-power inverter market is still expected to usher in development opportunity.

@ century new energy grid: the global top 20 photovoltaic module manufacturer gain 70% market share in the first quarter of 2013.

With the photovoltaic industry continues to present end market globalization, a line of photovoltaic components suppliers also actively explore overseas markets in order to increase market share, particularly in China top 10 line components suppliers, for example, yingli and trina, RON artest, jinko and renesola, etc.

@ the national standardization management committee of industrial department 2 LiuDaShan: for a long time, China's pv industry in the absence of standards in fast development, resulted in the international discourse power is not strong.

Now with the large-scale domestic demand market, core standards of the issues hampering the photovoltaic application is expected to the whole advancement, to steady recovery in photovoltaic industry foundation.

Flying dreams with technology and responsibility

Liu Ping, 40, changchun, shenyang railway car depot vehicle chief Z61/2 times, is the outstanding representative of the solar inverters railway worker, have a job, has won national railway locomotive medal, the styles of the whole railway network advanced individual, shenyang railway technology pacesetter, shenyang railway bureau party security could the benchmarking, etc.

Such a model, his dream is to use technology and responsibility guardian trains, let passengers home no longer to travel long distances, but toward a happy start.

Most of "golden sun" engineering project belongs to the distributed solar inverters

As the support will be the largest in the history of pv industry support policy, "golden sun" end why, it is for the domestic development of distributed  grid tie inverter accumulated the experience and lesson? Grid companies active in interconnection performance, in the process of advance, what policy barriers encountered again? What is key factors restricting the development of distributed photovoltaic (pv) in China? How to interpret KWH subsidy policy paper, distributed photovoltaic power generation for more ideal model of development? Recently, this reporter of distributed photovoltaic industry gathered in China north China, central China, east China, south China and other economically developed areas system research, through the observation and thinking and responding to the above question.

Looking back to "golden sun"

Issued "golden sun" project 2009, photovoltaic industry overseas markets remain robust, with zhejiang chint  solar inverters  development co., LTD.

Deputy general manager Li Chongwei's words, "basically, as long as you can do it, someone is waiting to board."

In the face of the government's money, when big companies like suntech does not look good in the domestic market, are busy in overseas expansion.

But there are also companies began to realize the importance of cultivate the domestic market, high investment subsidies, after all, it is tempting to chint is one of them.

By the end of February, 61, zhejiang province, " power inverter " project, 218.5 mw of installed capacity, a third is made of chint.

In 2009, chint and he took the five golden sun project.

When policy is based on comprehensive cost 50% subsidy, in other words, the investment of 20 million yuan, the central government direct subsidies of 10 million yuan, but the money after the project start, press 70% budget issue first, and the remaining 30% until after the project completion acceptance.

This is our most concern of Chinese solar inverters status quo.

Supply and demand relationship is an important symbol of the deterioration of the grid tie inverter price fell sharply.

While technological progress is a decrease in the prices of the reasons, more important is the white-hot competition.

In early 2010, a photovoltaic (pv) EPC project, the component price is about RMB 14 / W, has dropped to less than 5 yuan/W.

Domestic inverter company less than 30, 2009, currently estimated at more than 300.

Price per watt in the 2009 3 yuan more, fell to less than 0.5 yuan/W.

In solar inverters and UPS system under normal circumstances, if the load overload or short circuit, when the load exceeds the system rated output capacity, which is less than the sum of all power module power output, the system can continue to run normally, send out alarm signal at the same time, the system is no longer have redundant function; If load flow more than the sum of all power module output power rating, weaver logic commands will make all of the main circuit power module input and output relay focus on static bypass switch and automatic transfer system, deal with directly by the grid and power distribution protection over-current load;

Mains failure: in the case of mains failure is detected, the rectifier will automatically inverter charger bus with ac input isolation, at the same time, the battery pack into the discharge state, guaranteed by the inverter load continuous operation; Once the mains, UPS can in the case of don't need human intervention, automatically return to normal operation mode;

Manual maintenance bypass, throughout the entire system failure or the need for emergency maintenance, transfer system maintenance bypass;

Troubleshooting: can quickly repair is one of the most important features of modular UPS, usually system an important link and the reliability is relatively weak link in physical structure composed of separate modules, and pull out plug ways are available for installation repair and replacement.

And mutation and foreign markets, especially Europe and the capacity to contract solar inverters

Photovoltaic capacity in regional centralized phenomenon, such as jiangsu, hebei, jiangxi region concentrated a large number of Chinese pv companies, the country almost every development zone has its own new energy base, new energy sources such as grid tie inverter in the capital construction enterprises, this is not conducive to industrial agglomeration brings economies of scale and scope of effect.

Photovoltaic (pv) industry overcapacity is mainly lack of final demand.

Solar energy is developed by state subsidies, and thermal power cannot be competitive.

Got into the mess, and photovoltaic (pv) there is a close relationship between "two head out", '.

Photovoltaic (pv) "two head out" in the past usually refers to silicon material source and solar inverters components in foreign markets.

The situation has changed. Materials on the one hand, the domestic silicon excess capacity, on the other hand, compared with the abroad, production costs are subject to domestic silicon technology and scale factors, high.

Production cost under $20 / kg abroad, and domestic except a few manufacturers such as gcl-poly, most other manufacturers production costs are generally in the $30 / kg.

As a result, the domestic panel manufacturers still choose imported from abroad, lead to silicon material there are still a significant number of from abroad.

From the point of pure sine wave inverter market, 2011 years ago, the domestic production capacity of more than 90% of exports abroad, but since 2012, in the domestic photovoltaic industry support under the action of a series of policy, the rapid development of domestic pv power generation and installed capacity of more than 3, 2012 gigawatts (gw), and for the first time the wind power installed capacity.

It is estimated that the future domestic pv market will be able to digest domestic capacity by 40%.

'to hell and die enterprises, would result in a capacity to go out, have an effect on healthy development of the industry, tow good companies also died.

Both houses of drawing up a blueprint for solar inverters

Remarkable 2013 national two sessions concluded successfully in Beijing yesterday.

During the two sessions this year, delegates and members for the next five years the development of society and economy,power inverter a blueprint, make recommendations.

Among them, the new type of urbanization, power inverter, energy conservation and environmental protection as two sessions, the well-being of the issues of the most remarkable keywords.

Today this version in the form of a special report,power inverter to comb through the above keywords,power converter and combined with the market opportunity, excavate the investment value of the topic to readers.

The power converter
Policy support areas
Our reporter Ren Xiaoyu
Hot throughout the year the two sessions, new energy is one of the areas of national annual high attention in 2013, has become the focus of two sessions on behalf of the members,power converter is also one of policy strongly support areas.

Market analysts believe that in the two sessions this year, countries will be big efforts to support the development of solar inverters, new policies and measures, take advantage of new energy development is beneficial to China in the world, including electric cars, solar inverters, solar inverters will benefit.

In early 2013, the national energy technology "twelfth five-year" plan ".

"The plan" clearly, the future energy development in our country will become green, diverse, low carbonization change, to the coordinated development of ecological environment protection and energy, wind power, photovoltaic, biomass and other renewable energy is the key to adjust the energy structure in the future.

On March 5, in the twelfth session of the National People's Congress for the first time meeting, premier wen jiabao of the state of the government work report points out, the past five years, non-fossil energy rapid development, hydropower, wind power is the first in the world.

Report points out that when puts forward Suggestions for the government's main job this year, to comply with the expectations of the people for a better life environment, vigorously strengthen the construction of ecological civilization, and environmental protection.

To adhere to the basic state policy of resource conservation and environmental protection, promoting green development, the development cycle, low carbon development.