Photovoltaic maximum power point tracking under dynamic partial shading changes by novel adaptive particle swarm optimization strategy

Abstract

Maximum power point tracker (MPPT) is vital device in the Photovoltaic (PV) system because it can increase the generated power considerably. Partial shading conditions (PSCs) on the PV array generates many peaks in the P-V curve of PV array. Metaheuristic techniques like particle swarm optimization (PSO) have the ability to track the global peak (GP) at any operating conditions. PSO technique can track the GP but once the shading pattern (SP) changes, the value and location of the new GP will change and may PSO cannot catch the new GP because all particles are busy around the previous GP. This problem is classified into two conditions: the first condition if the GP change its location and value suddenly, the second condition occurs when the GP changes its value gradually and still in same place. The first problem is solved by reinitializing the particles. The second problem is solved using a new adaptive strategy that has not been treated or adopted in any literature before. The results obtained prove the superiority of the new proposed strategy in always catching GP in dynamic change PSCs.

Performance Improvement of PV Systems’ Maximum Power Point Tracker Based on a Scanning PSO Particle Strategy

“…For example, if it is required to determine the position of the 3rd peak using Equation (3), wher 4, k = 3, kv = 0.8 [22], and with VOC = 640 V and VDC = 650 V, after applying these values to (3) th ty ratio of the third peak is d (3) = 0.606 which lies between the boundaries of the third peak positio stated above. This, initializing the PSO particles at the anticipated locations of peaks obtained from uation (3) will reduce the convergence time and avoid premature convergence substantially [15] Proposed Methodology…”

“…All of the MPPT techniques track the GP by controlling the terminal voltage of the PV array using DC/DC converter. Many converters have been used for this purpose, such as boost converter [15], buck converter [16], buck-boost converter [17], SEPIE [18], etc. A review on the use of different kinds of DC/DC converters as an MPPT of PV systems is given in [19].…”

“…Figure 3 shows the P-d curves for different numbers of peaks. PSO techniques have been used in many researches for MPPT of PV system in uniform distributed irradiance and PSCs [15,20]. The PSO technique has the advantages of simple logic, easy implementation, fast computation, and fast convergence [4].…”

“…Figure 3 shows the P-d curves for different numbers of peaks. PSO techniques have been used in many researches for MPPT of PV system in uniform distributed irradiance and PSCs [15,20]. This relation can be used to determine the relation between the power and duty ratio of the boost converter (P-d curve).…”

“…Meanwhile, in case of dynamically variable PSCs, the position and value of the GP may vary which renders the conventional PSO as well as other metaheuristic techniques unable in the capture of the new GP because all particles are concentrated at the previous one. For this reason, many researchers introduced reinitialization techniques to reinitialize the particles [15,20,21]. Eltamaly et al introduced two reinitialization strategies-one strategy is set to repeatedly reinitialize the particles after a certain period of time; the other strategy is reinitializing the particles based on shading patter (SP) changes [21] where the SP is detected using Equation (2).…”