The rapid development of new energy The northwest power grid is mixed

Expert advice:

■ It is necessary to improve the way and mechanism for new entities to participate in the electricity market, improve the flexible adjustment ability of the power system through the power supply side, power grid side, demand side, energy storage side, etc.

■ It is necessary to re-improve or even reshape the current electricity market

"Wind and solar energy resources are abundant in the northwest region, and the installed capacity of new energy has shown leapfrog growth in recent years", "the proportion of new energy installed capacity and power generation in the northwest power grid is in the forefront of the national regional power grid", "the total installed capacity of new energy in the northwest power grid this year will exceed thermal power, becoming the largest power source in the whole northwest network"

Participating experts believe that under the guidance of the carbon peak carbon neutrality target, the new energy in the northwest region will enter a stage

This year, new energy will become the largest power source in the northwest power grid

According to the data, by the end of 2021, the installed capacity of new energy in the northwest power grid will account for 42%, and the power generation capacity will account for 21%, far exceeding the national average of 27% of new energy installed capacity and 12% of power generation, and has exceeded the same period of

Li Gengfeng, a professor at Xi'an Jiaotong University, said that under the new situation of carbon peak carbon neutrality target and the planning and construction of wind and solar large bases, the proportion of new energy in the northwest power grid will be further improved

At the same time, the reporter learned from the seminar that according to the existing growth rate speculation, the proportion of new energy power generation in the northwest power grid will exceed 1/4 in 2025, more than 1/3 in 2030, and reach 50%

The utilization rate of new energy is facing a reversal of "five consecutive rises"

Li Gengfeng told reporters that from 2016 to 2021, the northwest power grid has achieved five consecutive reductions in the curtailment rate of wind and light and five consecutive liters
in new energy installed capacity and power generation.
However, with the rapid development of new energy, the momentum of "five consecutive rises" is expected to be stopped
in 2022.
For example, in May this year, the curtailment rate in Gansu Province climbed to 18.
3%, and the curtailment rate in Qinghai Province rose to 16.
3%, which shows that the development of new energy in the northwest region has brought continuous growth pressure to the power grid
.

Industry experts believe that with the large-scale wind power photovoltaic base projects with a scale of more than 100 million kilowatts and mainly deserts, Gobi and deserts being put into operation, the pressure on new energy power consumption in the northwest region will become more and more intense
.

In Li Gengfeng's view, the factors restricting the consumption of new energy in the northwest region are more complicated
.
Among them, the main reason is that the power balance is blocked and the safety and stability are blocked, which are reflected in the obstruction of the cross-section and the obstruction
of peak shaving, respectively.
Among them, the cross-section obstruction mainly refers to the limited capacity of the transmission channel, the internal grid structure of the northwest power grid is an east-west long-chain structure, and the geographical distribution of power generation and load centers is uneven; Peak shaving is mainly due to the limited capacity of system peak shaving, and data in recent years show that the power gap in the northwest power grid continues to increase during the evening peak, and the daytime peak regulation capacity is seriously insufficient
.

Wang Jixue, deputy chief engineer of the General Institute of Electric Power Planning and Design, said that at present, the northwest power grid is not only the regional power grid with the largest number of DC landing points and delivery provinces, but also the largest transmission terminal and power resource output regional-level power grid
in China.
Multiple UHVDC appear in multiple delivery areas, and the supporting power supply and local grid are highly complex
.
For example, the regulations and completed channels in northern Shaanxi are concentrated in Yan'an, Yulin and other areas, and the new energy power supply in these areas is relatively scattered, in order to ensure the safety and stability of the power grid, the local rebuilt a small power grid
.
"At present, the more urgent task is how to plan in advance to achieve the synergy between the stock and the incremental line, as well as the synergy between the supporting power supply of new energy and the power grid channel
.
"

The current rules of the electricity market are not enough

With the continuous increase in the proportion of new energy installed capacity in the northwest power grid, the power system is facing pressure
to ensure supply and consumption at the same time.
In addition, the market entities in the northwest region are diversified and complex, and the interests of various market entities are intertwined, and the phenomenon of "free riding" is obvious
.

In this regard, Li Gengfeng suggested that it is necessary to improve the way and mechanism for new entities to participate in the electricity market, improve the flexible adjustment ability of the power system through the power supply side, power grid side, demand side, energy storage side, etc.
, and adapt to the requirements of
large-scale new energy grid-connection.
At the same time, under the premise of following market rules, clarify the way for emerging entities such as independent energy storage, demand response, and distributed photovoltaics to enter the market and the status of independent market entities, reasonably and effectively solve the problem of consumption through the price mechanism, and promote the full development of
new market entities.

Chen Tianen, an expert at the northwest branch of the State Grid, said that when the penetration rate of new energy electricity rises from 20% to 40%, the power grid will face more severe challenges
.
"In this context, the existing peak-to-valley price difference and auxiliary service mechanism will be inadequate, it is difficult to guide the coordinated operation of the source network, load and storage, and the price guides the attenuation of investment signals, which needs to be re-improved or even reshaped the current electricity market
.
"

In addition, industry experts also suggest that regional mutual assistance space can be increased through inter-provincial peak regulation, play a cross-regional adjustment capacity, support the development of new energy at the sending end, and mobilize the resources of the receiving end to enhance the flexibility of the power grid at the sending end
.
From the perspective of load characteristics, the highest load in Ningxia, Gansu and Qinghai occurs in winter, and the highest load in Shaanxi occurs in summer, and there is seasonal complementarity
between provinces (regions).
(Reporter Sunan)

Transferred from: China Energy News