Asynchronous cooperative optimal AGC control system for wind power plant and conventional frequency modulation unit
A control system and technology for wind turbines, applied in the direction of climate change adaptation, reducing/preventing power oscillation, etc., can solve the problems of aggravating the number of operations of wind turbines, complex LFC coordinated control, and different operating characteristics of wind farms, and improve the frequency control effect. , The effect of reducing the number of secondary frequency modulation controls in the wind farm and reducing the wear of the unit
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[0074] As shown in Table 1, the system area contains 6 MW thermal power frequency modulation units and a wind farm. Such as image 3 shown. Using the wind speed of Longtangshan Wind Farm in a certain month in 2019 to generate the maximum power tracking curve of the wind farm, the regional load fluctuations are as follows: Figure 4 shown. Control area frequency deviation coefficient ε 1 12MW / 0.1Hz; tie-line power deviation is limited to ±50MW; frequency deviation is limited to ±0.2Hz; instruction execution interval is 5s. The simulation platform adopts i7-7700K processor and MATLAB2018b simulation software.
[0075] Table 1 The operating parameters of the right Shen machine
[0076]
example 1
[0077] Example 1: Table 2 gives the instructions and adjustment costs of each frequency modulation unit within 0 to 10 minutes. As shown in Table 2, the total order times of the 6 conventional units are 21 times (up regulation instruction) and 32 times (down regulation instruction), and the frequency regulation times of the wind farm are 10 (up regulation instruction) and 6 (down regulation instruction) . The wind farm provides 831.47MW of secondary frequency regulation capacity for load reduction operation at the coordination point, and undertakes part of the AGC regulation capacity.
[0078] Table 2 Frequency modulation unit command and regulation cost statistics
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[0080] Figure 5 , Figure 6 They are frequency deviation and CPS1 index curve respectively. Such as Figure 5 As shown, the frequency deviation does not obviously exceed the allowable upper and lower limits of control. This is because wind power participates in frequency regulation and can provid...
example 2
[0081] Example 2: The simulation time is set to 20 minutes. Figure 7 It is the distribution of asynchronous coordinated dispatching points of wind farms. Within 700 to 1000s, the trend of wind speed change is mostly the same. The frequency modulation rate and frequency modulation reserve of wind farms are also limited, and wind turbines should not be started and stopped frequently. At this time, there are only 8 wind power dispatching points. Increased the reliability of the frequency modulation capability of the wind farm. Table 3 shows the operation of the frequency modulation unit. As shown in Table 3, the opportunity cost of the wind farm is only 1.05 million, which effectively reduces the opportunity cost of the wind farm and greatly improves the overall economics of the system.
[0082] Table 3 Operation of frequency modulation unit
[0083]
PUM
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