Analysis, Design, and Experimental Verification of a Synchronous Reference Frame Voltage Control for Single-Phase Inverters

Abstract

Abstract-Control of three-phase power converters in the synchronous reference frame is now a mature and well developed research topic. However, for single-phase converters, it is not as well-established as three-phase applications. This paper deals with the design of a synchronous reference frame multi-loop control strategy for single phase inverter-based islanded distributed generation (DG) systems. The proposed controller uses a synchronous reference frame PI (SRFPI) controller to regulate the instantaneous output voltage, a capacitor current shaping loop in the stationary reference frame to provide active damping and improve both transient and steady-state performances, a voltage decoupling feedforward to improve the system robustness, and a multi-resonant harmonic compensator to prevent low-order load current harmonics to distort the inverter output voltage. Since, the voltage loop works in the synchronous reference frame, it is not straightforward to fine-tune the control parameters and evaluate the stability of the whole closed loop system. To overcome this problem, the stationary reference frame equivalent of the voltage loop is derived. Then, a step-by-step systematic design procedure based on a frequency response approach is presented. Finally, the theoretical achievements are supported by experimental results.Index Terms-Single-phase inverter, stand-alone mode, multiloop, synchronous reference frame (SRF).

Synchronous Frame Control for Voltage Sag/Swell Compensator Utilizing Single-Phase Matrix Converter

“…1 was proposed in this paper. A virtual orthogonal signal is needed to implement the synchronous frame controller in the single-phase system (6) (7) . In this paper, as the orthogonal signal, a quarter cycle delayed signal is generated from the original signal.…”

High-Performance Voltage Controller Design Based on Capacitor Current Control Model for Stand-alone Inverters

“…1. The inductor current control model can be given by (1), and the capacitor current control model can be obtained as (2).…”

“…Although the response of an inverter is faster with a single feedback loop, a multiple feedback loop is more advantageous in shutting off overcurrent and improving the transient response of inductor [1][2][3][4][5][6][7][8]. The multiple feedback loop control method is widely used by researchers because of the ease of implementation and good performance [9,10].…”

Verification of the control system performance using viability theory

“…Safety of the system is a major issue that is investigated using reachability analysis [2]. There is also a rich literature in experimental verification of control systems [3], [4], [5].…”