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Performance Enhancement of Actively Controlled Hybrid DC Microgrid Incorporating Pulsed Load ABSTRACT: In this paper, a new energy control scheme is proposed for actively controlled hybrid dc microgrid to reduce the adverse impact of pulsed power loads. The proposed energy control is an adaptive current-voltage control (ACVC) scheme based on the moving average measurement technique and an adaptive proportional compensator. Unlike conventional energy control methods, the proposed ACVC approach has the advantage of controlling both voltage and current of the system while keeping the output current of the power converter at a relatively constant value. For this study, a laboratory scale hybrid dc microgrid is developed to evaluate the performance of the ACVC strategy and to compare its performance with the other conventional energy control methods. Using experimental test results, it is shown that the proposed strategy highly improves the dynamic performance of the hybrid dc microgrid. Although the ACVC technique causes slightly more bus voltage variation, it effectively eliminates the high current and power pulsation of the power converters. The experimental test results for different pulse duty ratios demonstrated a significant improvement achieved by the developed ACVC scheme in enhancing the system efficiency, reducing the ac grid voltage drop and the frequency fluctuations.
KEYWORDS: 1. Hybrid dc microgrid 2. Energy control system 3. Pulse load
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0-9347143789/9949240245 4. Supercapacitor 5. Active hybrid power source
SOFTWARE: MATLAB/SIMULINK BLOCK DIAGRAM:
Fig. 1. Schematic diagram of the hybrid dc microgrid under study
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EXPECTED SIMULATION RESULTS:
Fig. 2: Experimental test results of ACVC and CACC technique during constant pulse load operation.
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Fig. 3: Experimental test results of CACC method and ACVC technique when pulse load frequency changes from 0.1-Hz to 0.2-Hz and its duty ratio increased from 20% to 40%.
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Fig. 4: Variation of the normalized average dc bus voltage and the kv in the proposed ACVC technique when pulse load frequency changes from 0.1-Hz to 0.2-Hz and its duty ratio increased from 20% to 40%.
Fig. 5: Experimental test results of CACC method and ACVC technique when pulse load changed from 2-kW to 3kW.
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Fig. 6: Hybrid DC microgrid performance comparison when ACVC, LBVC and IPC methods are utilized.
CONCLUSION: In this paper, a new energy control scheme was developed to reduce the adverse impact of pulsed power loads. The proposed energy control was an adaptive current-voltage control (ACVC) scheme based on the moving average current and voltage measurement and a proportional voltage compensator. The performance of the developed ACVC technique was experimentally evaluated and it was compared to the other common energy control methods. The test results showed that the ACVC scheme has a similar performance with the continuous average current control (CACC) method during a constant pulsed power load operation. However, the transient response of the ACVC technique during pulse load variation For Simulation Results of the project Contact Us
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 was effectively improved and it prevented any steady state voltage error or dangerous over voltage. Also, the performance of the developed ACVC technique was compared with the limitbased voltage control (LBVC) and instantaneous power control (IPC) methods for different pulse rates and duty ratios. The comparative analysis showed that although the maximum dc bus voltage variation in the case of ACVC scheme was higher than the IPC and LBVC methods, the proposed ACVC technique required smaller power capacity of the converter and energy resources. Moreover, the developed ACVC method effectively eliminated the power pulsation of the slack bus generator and frequency fluctuation of the interconnected AC grid while the ac bus voltage drop was well reduced. Additionally, the efficiency analysis for different pulse duty ratios showed that the developed ACVC method considerably improved the efficiency of the system since the maximum current of the converter was reduced and the converter was operating at a relatively constant value.
REFERENCES: [1] M. E. Baran and N. R. Mahajan, “DC Distribution for industrial systems: opportunities and challenges,� IEEE Trans. on industrial applications, vol. 39, no. 6, pp. 1596-1601, November/December 2003. [2] M. Farhadi, A. Mohamed and O. Mohammed, "Connectivity and Bidirectional Energy Transfer in DC Microgrid Featuring Different Voltage Characteristics," Green Technologies Conference, 2013 IEEE, vol., no., pp.244-249, 4-5 April 2013. [3] D. Salomonsson, L.Soder, A. Sannino, "An Adaptive Control System for a Dc Microgrid for Data Centers," Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE, vol., no., pp.2414,2421, 23-27 Sept. 2007. For Simulation Results of the project Contact Us
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 [4] M. Falahi, B K.L. utler-Purry and M. Ehsani, "Reactive Power Coordination of Shipboard Power Systems in Presence of Pulsed Loads," Power Systems, IEEE Transactions on, vol.28, no.4, pp.3675-3682, Nov. 2013. [5] M. Farhadi, and O. Mohammed, "Realtime operation and harmonic analysis of isolated and non-isolated hybrid DC microgrid," Industry Applications Society Annual Meeting, 2013 IEEE , vol., no., pp.1,6, 6-11 Oct. 2013.
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