Integration and operation of a single phase bidirectional inverter with two buck boost mppt’s
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This document discusses a study focused on integrating and operating a single-phase bidirectional inverter with two buck/boost maximum power point trackers for DC distribution applications. The inverter controls power flow between the DC bus and AC grid and regulates the DC bus voltage. A droop regulation mechanism is proposed to reduce capacitor size, balance power flow, and accommodate load variation based on inverter inductor current levels. The buck/boost MPPT topology allows operation at the 380V DC bus voltage from 0-600V PV array voltages, reducing voltage stress on the inverter. The controller can check MPPT input configuration, distribute current equally between two parallel MPPTs, and smooth mode transitions. Experimental results from a 5kW system
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This document discusses the integration and operation of a single-phase bidirectional inverter with two buck/boost maximum power point trackers for DC distribution applications. The inverter controls power flow between the DC bus and AC grid and regulates the DC bus voltage. A droop regulation mechanism balances power flow and accommodates load variation based on inductor current levels. The buck/boost MPPT topology allows the PV array voltage to vary from 0 to 600V while operating the inverter at the 380V DC bus voltage, reducing voltage stress. Experimental results from a 5kW system verify the feasibility of the discussed controller which can check MPPT input configuration, distribute current equally between parallel MPPTs, and smoothly transition between control modes.
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Integration and operation of a single phase bidirectional inverter with two buck boost mppt’s
- 1. INTEGRATION AND OPERATION OF A SINGLE-PHASE BIDIRECTIONAL INVERTER WITH TWO BUCK/BOOST MPPT’S FOR DC-DISTRIBUTION APPLICATIONS ABSTRACT: This study is focused on integration and operation of a single-phase bidirectional inverter with two buck/boost maximum power point trackers (MPPTs) for dc-distribution applications. In a dc-distribution system, a bidirectional inverter is required to control the power flow between dc bus and ac grid, and to regulate the dc bus to a certain range of voltages. A droop regulation mechanism according to the inverter inductor current levels to reduce capacitor size, balance power flow, and accommodate load variation is proposed. Since the photovoltaic (PV) array voltage can vary from 0 to 600 V, especially with thin-film PV panels, the MPPT topology is formed with buck and boost converters to operate at the dc-bus voltage around 380 V, reducing the voltage stress of its followed inverter. Additionally, the controller can online check the input configuration of the two MPPTs, equally distribute the PV-array output current to the two MPPTs in parallel operation, and switch control laws to smooth out mode transition. A comparison between the conventional boost MPPT and the proposed buck/boost MPPT integrated with a PV inverter is also presented. Experimental results obtained from a 5-kW system have verified the discussion and feasibility.