On May 7th, the State Grid Corporation North China Branch and Inner Mongolia Bohai Power Generation Co., Ltd. conducted data analysis on the real-time control experiment of deep peak shaving of Unit 3 of Bohai Power Plant under the AGC (Automatic Generation Control) control mode jointly carried out in April. to sum up. According to the experimental experience, the State Grid North China Branch will promote the real-time control of deep peak shaving for all AGC direct control units. After the deployment, it is expected that the wind power consumption capacity of the whole network can increase by more than 10 million kW.
This test is the first time in China to achieve deep peak peaking. The unit output is controlled by AGC in real time. It accumulates the adjustment rate and load tracking real-time performance when the unit is peak-adjusted. It provides technical support for the promotion of the peak-adjusting auxiliary service market and strives to achieve clean energy. "Double rise and double drop" goal.
Deep peak shaving of the unit is the basis for opening up the power-assisted service market and improving the capacity of new energy consumption. As of April 2018, the installed capacity of new energy in North China Power Grid reached 73.02 million kilowatts, accounting for 21% of the total installed capacity of the entire network. At present, due to the coordinated control of the unit and environmental performance, the thermal power unit needs to exit the AGC when participating in the deep peak shaving. The peak shaving command is issued by the dispatcher by telephone. There are shortcomings such as low adjustment rate and poor real-time load tracking, which cannot adapt to the new one. Real-time energy consumption refinement requirements. In this context, it is imperative to improve the thermal peaking capacity of thermal power units and improve system regulation and new energy consumption.
In order to further tap the peaking resources, improve the technical support ability of the peaking auxiliary service market, and use the market mechanism to realize the real-time consumption of new energy, the State Grid North China Branch explores the use of AGC to realize the real-time control of thermal power unit deep peaking from the dispatching end. The sub-organization of each direct-fired thermal power plant carried out in-depth peak-shaving research, and discussed the issues of desulfurization and denitrification performance and unit coordinated control under low load. On this basis, carry out the work of AGC direct control unit remote range expansion and joint adjustment.
Before the test, the State Grid North China Branch organized the relevant technical personnel of Bohai Power Plant and Weibei Electric Power Research Institute to formulate detailed test plans, and determined special control measures for the main (re)thermal steam temperature control during the test, and finally realized the unit low. Expansion of the load operation interval.
In this test, while improving the real-time regulation of the thermal peaking peak regulation and load tracking, the breakthrough of the thermal power unit in the AGC control mode, the output of the unit is not less than 50% of the rated capacity, and the lower limit of the output is reduced to 20%. Therefore, the peaking depth of the thermal power unit is increased from the original 50% to 80%, that is, the single machine can increase the wind power consumption capacity of 200,000 kilowatts.
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