Abstract
Single-stage topology and the maximum power point tracking (MPPT) algorithm have advantages such as simple configuration and high efficiency in grid-connected photovoltaic (PV) systems. In conventional systems, current and voltage sensors of PV system are normally used for MPPT. This paper presents a modified control algorithm for the single-stage three-phase grid-connected PV system without PV current sensor with a variable step MPP-tracker. This algorithm is not derived from complex state equations and is not dependent on any circuit parameters. It simply calculates the output power of the inverter to replace the input power of the PV systems in the MPPT algorithm. The modified algorithm is simulated by using Matlab/Simulink software and implemented in the experimental prototype. With the single-stage configuration and PV current sensorless method, the prototype is suitable for lowcost high efficient implementation in the practice.
Highlights
Nowadays, PV energy system is one of important source for sustainable development in most of countries all over the world
With a goal to minimize the cost and control complexity, this paper presents a low-cost singlestage three-phase grid- connected PV system without the PV array’s output current sensor
Unlike other maximum power point tracking (MPPT) methods, the input power is substituted by Id value which is easy to calculate (Fig.7)
Summary
PV energy system is one of important source for sustainable development in most of countries all over the world. The maximum power point tracker (MPPTer) usually requires two sensors in the input side for PV system voltage and current. MPPT algorithm for single-stage configuration is based on Udc-controling ability of the inverter. The proposed algorithm uses only voltage sensor of PV array output and the MPPTer has to be detect the MPP (Fig.5).
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