Research on Parameter Identification of Closed Loop Control System of Electromagnetic Speed Regulation Coal Cutter

Abstract

Electromagnetic speed regulation coal cutter has simple structure and high performance cost ratio, and the PID or improved PID controller can enable stable and high efficiency operation of coal cutter. Since the underground coal mine has complex and uncertain operation condition, the coal cutter during actual operation may not reach the predicted performance requirement, controller parameter shall be adjusted. Electromagnetic speed regulation coal cutter system parameter identification method, on the basis of relay feedback self-tuning, is proposed, and relay cascade feedback control is introduced to respectively online optimize control parameter of speed loop and current loop, update controller parameter, and evaluate system response performance. The simulation and test result verifies the effectiveness of parameter identification result of the method, and improves the anti-jamming capability of the control system. Introduction The coal cutter is the critical electric equipment for coal mine production. At present, the domestic coal cutter almost all adopts electric traction mode. According to the traction motor type, it can be divided into variable frequency drive, switch reluctance drive and electromagnetic speed regulation types, wherein, electromagnetic speed regulation coal cutter has stable operation, low cost and easy maintenance with certain position among coal cutter driving. Electromagnetic speed regulation motor is also called slop frequency motor, the slip frequency clutch regulates the excitation current to change magnetic flux and realize energy exchange and AC speed control. The control mode is usually PID closed loop control to regulate rotation speed output of motor. Literature 1 analyzed the operation principle of double closed loop of electromagnetic speed regulation motor, and manual experience modification method was adopted to regulate system PID parameter with fairly low efficiency; Literature 2 adopted mathematical model structure of current loop and speed loop in case of double closed loop control, but there was no analysis and simulation for the system parameter; Literature 3 studied the operation condition characteristic of electromagnetic speed regulation coal cutter brake operation, and analyzed the impact of coal cutter system parameter to brake performance, but there was no quantitative analysis by using theoretical method; Literature 4 pointed out the problems of simulation PID regulator parameter drifting and commissioning of electromagnetic speed regulation motor, and adopted maximum membership degree ambiguity resolution controller real time regulation and simulation curve to present that, fuzzy controller control was more unblocked, but compilation of fuzzy rule also relied on manual offline resolution 3rd International Conference on Management, Education, Information and Control (MEICI 2015) © 2015. The authors Published by Atlantis Press 363 and could not realize self-adaptation online identification. Aiming at complicated operation condition characteristics of electromagnetic speed regulation coal cutter, this paper proposes the relay feedback based online parameter identification method, adopts the cascade feedback to enable coordinated operation of double closed loop, and there is no impact to normal operation of system during the parameter identification, so PID tuning parameter can be updated online and real time. Parameter Tuning Method of Control System of Electromagnetic Speed Regulation Coal Cutter Structure Characteristic and Control Mode. The electromagnetic speed regulation motor is composed of two parts as drive and driven, as shown in Fig. 1.