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Compared with traditional frequency modulation methods, if a reasonable control method can be adopted, load-side frequency modulation has the advantage of low cost. Air conditioning is a typical high-power household temperature-controlled load. The huge number and outstanding energy storage characteristics make it an important part of demand response and power system frequency modulation. This paper proposes a clustering and equivalent replacement method for air-conditioning load based on K-Means clustering algorithm. Based on the classification algorithm of air-conditioning load, a control strategy based on K-Means clustering algorithm for air-conditioning load participation in secondary frequency modulation of the system was proposed. Aiming at the phenomenon of “secondary peak load” in the process of load recovery in traditional control strategies, the time-sharing grouped frequency modulation control strategy is proposed. The simulation proves the effectiveness of this control strategy in eliminating the “secondary peak load” phenomenon.

In this paper, the hardware and software experiment system of the large angle maneuver of the satellite attitude is designed and realized according to the requirement of the professional construction. The composition includes: single axis turntable, a nitrogen source, the new DSP controller, model simulator, router, multi-channel rechargeable power supply system and battery, fiber optic gyro, flywheel, jet system, computer and printer etc. Attitude maneuver control method is PD control. The controller uses DSP SEED-DEC28335. The control experiment program is developed by using C language. Its research characteristic is to realize the wireless data communication between PC and DSP. The CCS compiler v5.5 and the operating system Windows 8-32 bits. The experimental results show that the large angle attitude maneuver simulation of the satellite based on flywheel is accomplished. The rotating angle range of the turntable is ±90 degrees. The accuracy of maneuver is less than 0.5 degrees and meet the simulation mission requirements.