Page 53 - Mathematical Models and Algorithms for Power System Optimization

Daily Economic Dispatch Optimization With Pumped Storage Plant 43

Table 2.8 Optimization calculation results of each power plant (MWh) with
generated energy constraints—Cont’d
Area Power Plant Name Upper Limit Lower Limit Optimized Energy

West area Maoming Thermal 3000.0 2000.0 3000.0
Power Plant
Zhanjiang Thermal 6500.0 4500.0 6366.0
Power Plant
North area Shaoguan Thermal 8000.0 5000.0 5108.7
Power Plant
Yunfu Thermal 2500.0 1800.0 2500.0
Power Plant
Changhu 900.0 850.0 853.0
Hydropower Plant
Nanshui 1000.0 750.0 750.0
Hydropower Plant
Liuxihe Hydropower 600.0 500.0 501.0
Plant
Middle area Huangpu Thermal 12000.0 10000.0 10779.0
Power Plant
Sha A Thermal 15000.0 12000.0 13580.0
Power Plant
Sha C Thermal 36500.0 30000.0 31066.0
Power Plant
Sha B Thermal 80000.0 5200.0 5280.0
Power Plant
Dayawan Nuclear 12500.0 9840.0 9840.0
Power Plant
Zhujiang Thermal 20500.0 8500.0 8640.0
Power Plant
Xintian Thermal 3500.0 2000.0 3120.0
Power Plant

(6) Optimization results of generated output of each area in various time periods: optimization
results of generated output of each area in various time periods are shown in Fig. 2.13.
Numerical values of area generated output are given Table 2.9. Fig. 2.13 shows that the
generated output curves are almost flat in 24h for some areas, such as purchase area, north
area, south area, and west area. As for east area, because there are more hydropower plants
with stronger peak regulating ability, its generated output curve changes along time with
load curve. And for the middle area, the variation tendency of output curve is opposite to that
of load curve, because the pumped storage plant is located in this area, which pumps water in
the valley period and generates power in the peak period, functioning as peak load shifting.
(7) Results of load curve after optimized operation of the pumped storage plant: the test
system is large in scale, in which the installed capacity of thermal power is 10,315MW,
hydropower 924MW, and pumping power 1200MW. Table 2.10 shows total load and
average load of the pumped storage plant before and after output optimization. According
to the table, the maximum system load before optimization is 7000MW, minimum load is