Smart grid itself is a kind of Internet of things, especially the distribution part of smart grid is ubiquitous Internet of things. Yu Yixin, academician of Chinese Academy of engineering, expounded his views on ubiquitous power Internet of things and smart grid at the “exchange meeting on ubiquitous power Internet of things and energy service mode”.

At present, intelligent technology is permeating from science and technology to industry. With the wide application of various advanced technologies in power grid, intelligent technology has become the inevitable trend of power grid development. In the world, there are different understandings of the future power grid development mode, different development directions and technical routes, and different voices about the definition and direction of intelligence.

Yu Yixin believes that from the perspective of characteristics, smart grid is the bidirectional mobility of power and information, so as to establish a highly automated (intelligent) and widely distributed energy exchange network.

Smart grid is an energy exchange network with bidirectional mobility of power and information

Smart grid relies on distributed energy

Rifkin, the “master of future prediction”, declared that human society is bound to enter a new era, when renewable energy and Internet technology will be integrated to create a strong new infrastructure, which he called the third industrial revolution.

In this vision, hundreds of millions of people will produce green electricity from renewable energy in their homes, offices and factories and share it with each other in the “energy Internet”, just as we create and share information online now.

“The realization of energy revolution highly depends on the development and utilization of high proportion of distributed (especially renewable) energy in the future.” Yu Yixin pointed out the logic behind this point of view. At the same time, he believed that the most challenging problems are the intermittence, variability and uncertainty of wind energy and solar energy, and the high price of energy storage.

From the characteristics of wind power and photovoltaic, it can not operate alone for the time being, and Power Smoothing measures need to be adopted, including: absorption of large power grid, demand response, distributed energy storage and small fuel gas power generation. Therefore, a modern power grid with reasonable functions is needed to integrate a high proportion of solar energy and wind energy, and improve the efficiency of energy decarbonization, conversion and utilization.

First of all, the potential distributed generation can not be ignored and needs to be further improved in demand response and load control. China’s industrial power saving potential is huge. At the same time, the load of the tertiary industry and the residential load have the full potential of translatable (grid friendly users), which helps to reduce the peak valley difference rate of the grid (thus improving the utilization rate of power assets and energy efficiency), and support the grid in case of emergency, which helps to better absorb a high proportion of wind and solar power generation.

Secondly, electric vehicle is an important distributed energy storage vehicle. It is predicted that the number of electric vehicles will reach 80 million and the battery capacity will reach 2.4 billion kwh in 2030; Electric vehicle is not only a high-power electrical appliance (7KW charging for 4h), but also an energy storage device in power grid.

“Good management of these mobile energy storage devices can lay a solid foundation for large-scale landscape consumption. In addition, taking the optimal allocation of gas, electricity, heating, refrigeration and friendly emissions as an example, the energy utilization rate of the gas-fired distributed energy system will be more than 80% Yu Yixin told reporters.

How to manage widely distributed

At present, the intellectualization of the power grid can be regarded as “grid 2.0”, and the first intellectualization of the power grid is because the blackout prompted the U.S. government to promote power companies to make the power grid safer and more reliable. This time, the driving force is more powerful, mainly due to the energy pressure, climate and environmental problems, and the high requirements of Digital Society for power quality, power supply reliability, security and resilience of system operation (preventing small probability but causing huge losses).

“Urban Smart Grid and its communication system will constitute the infrastructure of smart city. From this point of view, smart grid is an integrated energy and information system, that is, a network of interconnected things. ” Yu Yixin pointed out.

In addition, he stressed that smart grid is a distributed infrastructure with hierarchical clustering. A very important core basic concept of smart grid is to build a smart grid like the Internet, fully reflect the spirit of the Internet, so as to make full use of the potential of renewable energy, support technological innovation, accept the rise of production and marketing customers, and integrate nano grid, mini grid and micro grid.

The performance of Internet spirit in smart grid is reflected in four aspects

One is open, that is, plug and play based on interoperability standards;

The other is equivalence, that is, the interconnection of energy autonomous units;

Third, cooperation and mutual support“ The distributed nature of renewable energy in the energy Internet brought about by the third industrial revolution requires collaboration rather than centralized or hierarchical command and control mechanisms;

The fourth is sharing, that is to achieve the optimal scheduling of global energy management by decentralized local optimization.

Yu Yixin specially emphasized the concept of “clustering” of classification“ In order to seize the opportunities in the future, I propose the following assumption: the differences between the future distribution network, microgrid, building units (buildings, factories, residential buildings, etc.) and the power transmission system will gradually disappear. With the characteristics of local power generation and two-way power flow, all of them will be equipped with energy management system, EMS) and achieve near real-time power balance according to the concept of “cluster”

One is the power network, and the other is the communication network. The two should be integrated. In order to exchange information from time to time and achieve the balance of supply and demand at the social level, it is necessary to introduce distributed computing, cloud computing, big data and artificial intelligence into the power grid.

The proposed smart grid will change people’s way of life and work like the Internet, and encourage similar changes“ However, due to the complexity of smart grid itself, involving a wide range of stakeholders, it needs a long transition, continuous R & D and long-term coexistence of various technologies. In the short term, we can focus on the realization of a more intelligent power grid, and make use of the existing or about to be configurable technology to make the current power grid more effective, which can not only provide high-quality power, but also create greater social benefits. “.

Source:Energy Magazine

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