Shi Lishan: Intermittent randomness in new energy generation

At the 5th China Central Investment and Trade Expo held recently held at the “Low Carbon Economy and New Energy Development Forum”, Shi Lishan, Deputy Director of the New Energy Division of the National Energy Administration, stated that the contradiction between the traditional power management system and new energy generation characteristics It is currently the main factor that restricts the development of new energy power generation.

According to Shi Lishan, at present, China's power system is composed of centralized large-scale power plants as its main power source. The power supply can be fully controlled and can be arranged according to the needs of the power load. The direction of power flow is fixed, mainly from The power plant is delivered to the power user. After the power plant generates power, it is boosted and sent to the area where it is used. The voltage is stepped down step by step to the user's desired voltage level to meet the user's power needs. At present, the power system is characterized by a small number of power stations and a large number of users. Power system managers can dispatch power stations according to the needs of the power load and require the power stations to increase the power generation capacity or reduce the power generation capacity in order to maintain a balance between supply and demand of the power system. To ensure the safe and reliable operation of the power system.

Shi Lishan said that, in contrast, renewable energy is characterized by a wide distribution of resources, low energy density, more suitable for small-scale decentralized development. If solar energy resources are everywhere, power generation facilities can be built; biomass resources are also scattered and suitable for the construction of small-scale power generation facilities. In addition, the intermittent and random nature of new energy resources has also placed new demands on the management of power systems.

He believes that with the development of renewable energy power generation, the power system must shift from centralized power supply to centralized power and distributed power supply. For example, each power user can install a photovoltaic power station. The power system will look like the current In the internet, every user is a power station at the same time. It can both obtain power from the power grid and transmit power to the power grid.

Shi Lishan said that according to the characteristics of renewable energy sources, it is necessary to speed up the construction of an electric power system adapted to the characteristics of renewable energy power generation, and at least make technical preparations in three areas. The first is to adapt the characteristics of renewable energy systems in power system dispatching and operation; the second is the small-scale distributed generation system grid-connected technology; third is large-capacity and high-efficiency power storage technology.