계통연계형 태양광 발전 시스템의 2차 고조파 저감 및 직류단 전압 센서리스 기법
Second-Order Harmonic Reduction Technique and DC-link Voltage Sensorless Control for Grid-Connected PV Systems
초록/요약
This paper proposes a second-order harmonic reduction technique and DC-link voltage sensorless control for grid-connected PV systems. In a grid-connected single-phase system, inverters create a harmonic at twice the fundamental frequency. A ripple component unsettles the operating points of the PV array and deteriorates the operation of the maximum power point tracking (MPPT) technique. A new feed-forward compensation technique using a PR controller for ripple reduction is proposed. The proposed algorithm is advantageous in that additional devices are not required and complex calculations are unnecessary. Therefore, this method is cost-effective and simple to implement. In an inverter, a DC-link voltage sensor is essential for power conversion. A sensor fault is detected when there is an error between the sensed and estimated values, which are obtained from a DC-link voltage sensorless algorithm. Fault-tolerant control is achieved by using the estimated values. A deadbeat current controller is used to meet the dynamic characteristic of the proposed algorithm. The proposed algorithms are validated by simulation and experiment results.
more목차
1. Introduction
2. Grid-Connected PV Systems
2.1 The overall configuration
2.2 Maximum Power Point Tracking
2.3 DC/DC Boost Converter
2.4 Analysis of Second-Order Harmonic
2.5 Deadbeat Current Controller
3. Second-Order Harmonic Reduction Technique
3.1 Proportional-Resonant Controller
3.2 Feed-Forward Compensation
4. DC-link Voltage Sensorless Control
4.1 Fault Diagnosis
4.2 Fault-Tolerant Control
5. Simulation Results
5.1 Second-Order Harmonic Reduction Technique
5.2 DC-link Voltage Sensorless Control
6. Experimental Results
6.1 Second-Order Harmonic Reduction Technique
6.2 DC-link Voltage Sensorless Control
7. Conclusions
References
