scholarly journals Simulation of Switched Reluctance Generator in Low and Medium Speed Operations for Wind Energy Application

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
A. Arifin ◽  
I. H. Al-Bahadly ◽  
S. C. Mukhopadhyay
Keyword(s):  
Manufacturing Industry ◽  
Closed Loop ◽  
Single Pulse ◽  
Least Square Method ◽  
Pulse Mode ◽  
Least Square ◽  
Voltage Level ◽  
Loop Control ◽  
Switched Reluctance ◽  
Medium Speed

This paper provides a new approach to maximize the amount of power generated by the switched reluctance generator (SRG) in the low and medium speed operations. There are many control variables which affect the power generated such as: firing angles, reference current, speed and voltage. It will incur high costs and time consuming to modify the variables using experimental set up. Hence, to minimize time, cost and aid in the manufacturing industry, a simulation model of the overall SRG drive is developed. The objective of the work is to identify the optimal parameters and characterize them under closed loop control. The study indicates that there is an optimal voltage, firing angles and reference current at each speed range. Also, the percentage of the power generated can be categorized as a function of dwell angle and speed at optimal voltage level. The optimal dwell angle is determined using the least square method. Within the closed loop system, the high percentage of power generated can be maintained by adjusting the voltage level. It allows operation in single pulse mode as opposed to the conventional current chopping during the low and medium speed.

Development of a digital control system for a belt-driven starter generator segmented switched reluctance motor for hybrid electric vehicles

2020 ◽  
Vol 234 (9) ◽  
pp. 975-984
Author(s):  
Long Chen ◽  
Haoxiang Wang ◽  
Xiaodong Sun ◽  
Yingfeng Cai ◽  
Ke Li ◽  
...  
Keyword(s):  
Control System ◽  
Digital Control ◽  
Closed Loop ◽  
Switched Reluctance Motor ◽  
Closed Loop Control ◽  
Digital Control System ◽  
Loop Control ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Starter Generator

A novel four-phase 16/10 belt-driven starter generator segmented switched reluctance motor has been proposed in a previous work to reduce torque ripple and increase the fault tolerance ability. Based on the previous research, the segmented switched reluctance motor digital control system is designed and presented. The digital control system including a power converter, detection circuits, and protection circuits is introduced in detail. For detection circuits, the half-detection method is employed to decrease the cost of the system. In addition, based on MicroAutoBox DS1401, a rapid control prototype platform is established. With this software system, it is easy to transfer control models and realize real-time control directly. Then, the speed closed closed-loop control for the segmented switched reluctance motor is applied to verify the proposed system. It contains current chopper control at a low speed and angle position control at a high speed. The simulation results are given, including the flux, current, torque, and efficiency range over the entire speed range of the segmented switched reluctance motor. Finally, the experimental results are presented to verify the simulation results and the effectiveness of the system. It can be found that the simulation and experimental results are consistent and acceptable, which means that the proposed digital system can operate naturally and accurately under speed closed loop control. Hence, the proposed digital system has high compatibility and practicability.

scholarly journals Multiple Modulation Strategy of Flying Capacitor DC/DC Converter

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 774 ◽  
Author(s):  
Pengcheng Li ◽  
Chunjiang Zhang ◽  
Sanjeevikumar Padmanaban ◽  
Leonowicz Zbigniew
Keyword(s):  
Closed Loop ◽  
Modulation Method ◽  
Closed Loop Control ◽  
Voltage Level ◽  
Loop Control ◽  
Dc Microgrids ◽  
Input And Output ◽  
Bidirectional Converter ◽  
Capacity Level ◽  
Current Difference

Flying-capacitor multiplexed modulation technology is suitable for bipolar DC microgrids with higher voltage levels and higher current levels. The module combination and corresponding modulation method can be flexibly selected according to the voltage level and capacity level. This paper proposes a bipolar bidirectional DC/DC converter and its interleaved-complementary modulation strategy that is suitable for bipolar DC microgrids. The converter consists of two flying-capacitor three-level bidirectional DC/DC converters that are interleaved in parallel 90°, and then cascaded with another module to form a symmetrical structure of the upper and lower arms; the complementary modulation of the upper and lower half bridges constitutes an interleaved complementary multilevel bidirectional DC/DC converter. If the bidirectional converter needs to provide a stronger overcurrent capability, more bridge arms can be interleaved in parallel. Once n bridge arms are connected in parallel, the bridge arms should be interleaved 180°/n in parallel. In bipolar DC microgrids, the upper and lower arms should be complementarily modulated, and the input and output are isolated by the inductance. To solve the current difference, caused by the inconsistent parasitic, the voltage-current double closed-loop-control is used, and the dynamic response is faster during bidirectional operation. This paper proposes theoretical analysis and experiments that verify bipolar bidirectional DC/DC converter for high-power energy storage.

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