Cross-regional cross-basin multi-energy complementary flexible adjusting system and method

Abstract

The invention discloses a cross-regional and cross-basin multi-energy complementary flexible adjustment system and method in the technical field of power systems. The method comprises the following steps: acquiring load characteristics of a large-regional power grid I and a large-regional power grid II; based on the load characteristics of the first large-area power grid and the second large-area power grid, whether the loads of the two large-area power grids have peak shifting benefits or not is judged; when the load of the two regional power grids has the peak shifting benefit, judging whether a peak regulation margin exists between the two regional power grids or not; determining a transmission power regulation scheme based on the load time periods of the large-area power grid I and the large-area power grid II in response to the peak regulation margin between the two large-area power grids; and performing power regulation between the large-area power grid I and the large-area power grid II based on the transmission power regulation scheme. According to the invention, cross-regional power grid adjustment mode arrangement can be defined, win-win development of two regional power grids is realized, and a novel power system is constructed together.

Description

technical field [0001] The invention relates to a cross-region and cross-watershed multi-energy complementary flexible regulation system and method, belonging to the technical field of electric power systems. Background technique [0002] The northwestern region is rich in new energy resources and is the main battlefield of my country's energy transformation. The exploitable wind power technology in the northwest region accounts for 21.87% (80 meters) and 30% (100 meters) of the national wind power. The theoretical reserves of solar energy in Northwest China account for 35% of the national theoretical reserves of solar energy, and the technologically exploitable amount accounts for 59% of the national solar energy technology exploitable amount. Northwest new energy installed capacity doubled from 60,000MW to 125 million kilowatts, accounting for 40% of installed capacity. At present, Northwest China has become the fastest growing and the highest proportion of new energy reg...

AI Technical Summary

Problems solved by technology

At the same time, due to the influence of one coal company in one province in Northwest China, and the warning of thermal power in Northwest China by the National Energy Administration, combined with various constraints, the development of traditional thermal power sources will gradually stagnate, the grid adjustment capacity will be stretched, and the risk of grid balance will become more prominent: First, it is difficult to balance power during peak load hours

Northwest new energy maintains a momentum of rapid growth, the scale of hydropower is close to saturation, the proportion of conventional power supply sources has further declined, and the grid balance has become more dependent on new energy. Benefits, the power that can reliably participate in the balance does not exceed 10% of the installed capacity of new energy. In the case of surplus power in the Northwest entire network, there is a power gap during peak load hours

The second is that it is difficult to adjust the peak during the new energy generation period. The fluctuation of photovoltaic output on heavy load days exceeds the difference between the noon and valley loads of the Northwest Power Grid (internal use + external delivery), and it is more difficult to reduce the load at noon.

However, combined with the actual situation in Northwest China, there are the following problems in the construction of peak-shaving power supplies: First, the construction of peak-shaving power supplies is difficult

Thermal power: Traditional conventional power supply has little room for adjustment. Thermal power has always been the backbone of the Northwest Power Grid to ensure power balance, grid security, and new energy peak regulation. Rising costs and coal consumption, lack of motivation for the flexibility and transformation of existing thermal power plants, and the external environment and its own economics have led to insufficient motivation for central enterprises to build new thermal power plants

Hydropower: Large-scale hydropower with good hydropower regulation capacity in Northwest China only has three sections of the main stream of the Yellow River. However, due to the limitations of ecological protection, interests of two provinces, and complex comprehensive utilization, the investment per kilowatt is relatively high, and it is difficult to meet the regulations and put into operation on schedule.

The remaining hydropower is dominated by small and medium-sized hydropower, mainly distributed in Xinjiang, with high investment and poor regulation ability

Energy storage power supply: pumped storage, electrochemical energy storage and photothermal power plants can be adjusted in both directions, and are high-quality peak-shaving power supplies. However, the construction of pumped storage with more mature technology is restricted by natural conditions and construction periods, which is costly and time-consuming. long

However, electrochemical energy storage, photothermal, etc. are restricted by current technical conditions, and the overall cost is still at a relatively high level.

Second, the high demand for regulation leads to continuous increase in system operating costs

The power balance in the evening peak in winter is mainly due to the insufficient hydropower power, which prevents the hydropower from being fully utilized. If the power gap is filled, there will also be a large power surplus

[0007] To sum up, as the proportion of new energy sources in the northwest power grid increases year by year, it brings new challenges to the power balance regulation of the grid. Generally, energy storage power sources are used to solve this problem. However, the peak-shaving power sources in Northwest China are insufficient, and the current "new energy The energy supply mode of + energy storage is difficult to achieve safety, economy, and efficiency in the short term, and other solutions are urgently needed. Moreover, the Northwest Power Grid currently adopts a single-region grid power balance adjustment mode, and there are a large number of wind and solar abandonment phenomena.

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