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Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters
- Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters
- Frontiers of Information Technology & Electronic Engineering Vol. 14, Issue 1, Pages: 50-64(2013)
- Affiliations：
1.Department of Applied Electronics, Zhejiang University, Hangzhou 310027, China
2.Institute of Energy Technology, Aalborg University, Aalborg 9000, Denmark
- Author bio：
Min CHEN, E-mail: calim@zju.edu.cn
- Funds：
DOI：10.1631/jzus.C1200236
CLC： TM464Received：08 August 2012，
Revised：2012-12-23，
Published：2013-01
- Accepted：
Scan QR Code
Ming-zhi GAO, Min CHEN, Cheng JIN, et al. Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(1): 50-64.
Ming-zhi GAO, Min CHEN, Cheng JIN, et al. Analysis, design, and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2013, 14(1): 50-64. DOI： 10.1631/jzus.C1200236.
摘要
Abstract
Parallel operation of distributed generation is an important topic for microgrids
which can provide a highly reliable electric supply service and good power quality to end customers when the utility is unavailable. However
there is a well-known limitation: the power sharing accuracy between distributed generators in a parallel operation. Frequency and voltage droop is a well-established control method for improving power sharing performance. In this method
the active and reactive power calculations are used to adjust the frequency and amplitude of the output voltage. This paper describes the digital implementation of a droop method
and analyzes the influence of power calculation on droop method performance. According to the analysis
the performance of droop control in a digital control system is limited by the accuracy and speed of the power calculation method. We propose an improved power calculation method based on
p-q
theory to improve the performance of the droop control method
and we compare our new method with two traditional power calculation methods. Finally
simulation results and experimental results from a three single-phase 1-kW-inverter system are presented
which validate the performance of our proposed method.
关键词
Keywords
references
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