The power grid is in the core hub position in the energy system, whether it is to promote the integration of "scenery, water, fire and storage" or to promote the integration of "source network load and storage", the power grid needs to play a leading role in traction.

Recently, the National Development and Reform Commission and the National Energy Administration issued the Guiding Opinions on Promoting the Integration of Charge and Storage and Multi-Energy Complementary Development of Power Sources and Networks (hereinafter referred to as the "Opinions"). Promote the high-quality development of "integration of source, network, load and storage" at the regional (provincial) level, city (county) level and park (residential area) level, as well as three kinds of multi-energy complementary integration projects of landscape storage, landscape water (storage) and landscape fire (storage). In the view of the industry, this means that the construction of "two integration" will really start.

In August last year, the National Development and Reform Commission and the National Energy Administration issued the Guiding Opinions on carrying out the integration of scenery, water, fire and storage and the integration of source and network load and storage (draft for comments). The idea of "two integrations" has officially surfaced.

Under the current trend of a high proportion of new energy such as wind power and photovoltaic being connected to the grid, the power grid based on traditional fossil energy is facing great challenges. The idea of "two integration" aims to promote changes at both ends of the power grid and power supply, so as to adapt to the arrival of the new energy era. So, can the construction of "two integration" force the transformation and upgrading of the power system as soon as possible?

Improve the friendliness of new energy and reduce the pressure on the power grid

The "Opinions" clearly defines the implementation path of the integration of source and network load and storage, and intends to explore the development path of a new power system with a high integration of source and network load and storage by optimizing and integrating local resources on the power supply side, the power grid side and the load side, supported by advanced technological breakthroughs and institutional innovation.

According to the public data of the National Energy Administration, by the end of 2020, the national grid-connected wind power and photovoltaic installed capacity reached 281 million kilowatts and 253 million kilowatts, respectively, accounting for 12.8% and 11.5% of the total installed capacity in the country, and the pressure of new energy power consumption is increasing. From the power side, the multi-energy complementary integrated base is obviously more flexible and friendly; From the power grid side, the integration of load and storage of the source network is really carried out around the load demand, which promotes the high integration and deep coordination of the power grid with the load and power supply.

The relevant person of Zhejiang Provincial Development and Reform Commission said that the integrated base of "scenery water storage" built in Zhejiang now realizes the automatic configuration, intelligent optimization and smooth switching of joint power generation operation modes such as wind storage, light storage, water storage and scenery storage in accordance with the time-series output optimization method, so that its power generation quality is close to conventional power supplies, and provides technical support for large-scale new energy grid connection and dispatching.

The core of the integrated construction of "scenery water storage" is to develop green and clean energy, make up for the shortcomings of wind power and photovoltaic through polymerization, and create a controllable power generation base, so as to reduce the pressure on the grid. "From a single new energy to a variety of new energy coupling, can improve the stability of the grid connection, so that the grid in the choice of online power has more space." Xuda technology general manager Li Jianduo said.

There are no regulations and standards, and the promotion is still difficult

According to the public information, the reporter found that there are more than 20 integrated base projects in different stages in China.

In this regard, industry experts pointed out that we must first clarify why to build integration projects, and then think about how to build the problem. The construction of integration projects is not achieved overnight, and all regions should not rush into it.

Li Jianduo told reporters that in the process of landing the project, there are still difficulties to be solved. "Provinces are in the exploratory stage of building integrated bases. There is no experience to follow on how to balance and coordinate the control of various energy sources according to demand. It is urgent for competent authorities to formulate operational strategies and issue regulations to set standards."

The staff of Guizhou Development and Reform Commission said that the biggest difficulty in building an integrated base is how the local government can coordinate the interests of all parties and mobilize the enthusiasm of power generation enterprises, power grids and energy storage enterprises.

The power grid is in the core hub position in the energy system, whether it is to promote the integration of "scenery, water, fire and storage" or to promote the integration of "source network load and storage", it needs the power grid to play a leading role.

The relevant person of China can build Zhejiang Electric Power Design Institute told reporters that the national policy did not put forward specific requirements or measures, just give the general direction, but also need to explore in practice. At present, the power grid is in a relatively conservative state.

Change the state of fragmentation, integration can not be nominal

The Opinions make it clear that the new energy power generation projects in the integration of source and network load and storage and multi-energy complementary projects should implement the national renewable energy power generation project management policy; Support participation in cross-provincial electricity market trading, incremental distribution reform and distributed generation market trading.

"Two integration" helps the new energy to friendly power supply transformation, help the power system more flexible and flexible. However, in the view of Wu Junhong, director of the smart energy Room of the East China Electric Power Design Institute, to truly solve the problem of new energy consumption, only the introduction of the "Opinion" is not enough.

"At present, the integrated base of the grid challenge is greater, many places do planning nominally called integrated construction, but in fact is not an overall power supply, photovoltaic, hydropower is still connected to the grid, for the grid, the accepted power supply is still a state of separation." At the power planning level, there is no optimization effect of integration, which makes the grid hold a wait-and-see attitude toward integrated project power supplies." Wu Junhong pointed out that "all power supplies should be connected in series, and energy storage should be accumulated to a certain scale before being connected to the grid, which not only improves the grid-connected efficiency, but also helps to better absorb new energy."