Power management algorithm for a conservative power theory battery storage based multi‐functional three phase grid connectedPVinverter

Abstract

Objective A conservative power theory (CPT) based two‐stage three‐phase multi‐functional grid‐connected photovoltaic (PV) inverter (MGCPI) with auxiliary battery storage system (BSS) is proposed in this article. This proposed configuration offers selective power injection and power conditioning to the consumers. A power management (PM) algorithm is developed to decide the best mode of operation of the MGCPI, taking into account the state‐of‐charge (SOC) of the BSS and the available power at the solar‐PV source for effective coordination between BSS and PV source. Methods CPT is used for computing the MGCPI current reference signals for multi‐functional operations. The feed‐forward linear control systems are designed using classical frequency response analysis for a synergetic operation of BSS and MGCPI. The whole system configuration is modeled using MATLAB/Simulink and validated in real‐time with PM algorithm for unbalanced linear and nonlinear loads using OPAL‐RT based OP4500 grid emulator. Result The injected power, percentage THD of individual phase currents, true power factor, and unbalanced current are measured for various modes of operation. The proposed MGCPI with BSS improves the power quality (PQ) and also injects seamless power at the point of common coupling (PCC) to reduce the grid consumption. Conclusion The real‐time results demonstrate the effectiveness of the proposed approach for unbalanced nonlinear loads in smart electric grid, provisioning harmonic‐free electrical power as per the requirements of IEEE 519‐2014, IEEE 1547a‐2018 standards.

Power Quality Improvement in Commercial and Industrial Sites: An Integrated Approach Mitigating Power Oscillations

“…Hybrid Cost [11] NO NO No Low [17], [24] NO NO Yes Medium [19], [21], [22], [25], [27] YES YES NO Medium [3], [20], [23] YES YES YES Higher [30], [31] YES YES NO Medium [32], [33] YES YES YES Higher [35], [36] YES NO YES Higher PROPOSED METHOD…”

“…The inverter includes a management strategy aimed at active power injection and reactive power compensation, taking into account the state of charge (SoC) of the BESS and PV intermittency. In [33], an energy management algorithm based on an MFGTI with BESS was developed, considering the optimal system operation mode as well as selective disturbance compensation. However, the integration of BESS into the inverter system, as in [32] and [33], results in additional costs, making the system more expensive.…”

“…In [33], an energy management algorithm based on an MFGTI with BESS was developed, considering the optimal system operation mode as well as selective disturbance compensation. However, the integration of BESS into the inverter system, as in [32] and [33], results in additional costs, making the system more expensive. In [34] proposes an efficient active and reactive power management scheme via fuel cell grid connection aiming at power factor correction; however, it does not address harmonic mitigation.…”

Dual mode control to improve power quality of 3‐phase 4‐wire grid interfaced PV‐battery system

“…The battery provides the best solution for RESs based grid integrated system and it minimizes the intermittency issues generated by the RESs 1,2 . The power management algorithm is used in the grid with the usage of batteries in the grid intertied PV system 3 . The 3‐phase 4‐wire system is preferable for the power distribution network.…”

“…1,2 The power management algorithm is used in the grid with the usage of batteries in the grid intertied PV system. 3 The 3-phase 4-wire system is preferable for the power distribution network. In industrial loads, some AC loads are integrated into 1-phase and 3-phase, therefore, such types of loads are linked to 3-phase 4 wire network.…”