Abstract
Single-stage grid connected inverters are considered as an economic, compact and simple topology compared with multi-stage inverters. In photovoltaic (PV) grid connected systems, the major requirement is to achieve maximum output power from the source. Maximum Power Point Tracking (MPPT) techniques require measurements on the DC side of the inverter connected to the PV in order to determine the current operating point on the power characteristics. Typically this is achieved by perturbing the reference output power and observe the change in the PV voltage, current or both. Based on the observation, it could be determined whether the current operating point is beyond or below maximum power. This paper presents an MPPT technique for a single-stage PV grid connected inverter where the MPPT algorithm determines the current operating point at different operating conditions based upon observing the inverter controller action. Such approach eliminates the requirement of sensing elements to be added to the converter which aids the advantages of the single-stage converter. Design of the utilized PV system is derived based on filter parameters, PV panel selection and controller parameters. Using simulation and practical implementation, the performance of the proposed MPPT technique is evaluated for the PV grid connected system.
Highlights
Utilization of photovoltaic (PV) technology in grid-connected applications offers several advantages, including notable reductions in maintenance and pollution
Utilizing the concept described in [23], this paper presents design considerations for simplify the topology, a current controlled, single-stage, single phase grid connected H bridge selection of PV panels, limitations in regards to operating range, tuning methodology of algorithm inverter topology is utilized [22,23]
In such case the Maximum Power Point Tracking (MPPT) algorithm design is set VMPP is below the operating voltage for would saturate at an operating point below the PMPP as illustrated in Figure 7 with the “Invalid to either: Selection” region
Summary
Utilization of photovoltaic (PV) technology in grid-connected applications offers several advantages, including notable reductions in maintenance and pollution. MPPTisalgorithm proposed a two stage topology where the DC/DC converter algorithm proposedis based on abased two on stage topology where the DC/DC converter tracks tracks maximum power and DC/AC converter synchronizes and feeds the available power the maximum power and DC/AC converter synchronizes and feeds the available power to the to grid Such approaches require at least one measurement (voltage or current) on the DC side. Utilizing the concept described in [23], this paper presents design considerations for simplify the topology, a current controlled, single-stage, single phase grid connected H bridge selection of PV panels, limitations in regards to operating range, tuning methodology of algorithm inverter topology is utilized [22,23]. A sensor-less current controller action in order to maintain the required power without any sensors on the MPPT algorithm is proposed and implemented based on perturbing the inverter reference output side. All these methodsand mainly depend havingand/or a complex control structure and sensing PV voltage and/or current
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