Abstract
This paper proposes a control system for the single-phase Three-Ports Active Neutral- Point-Clamped (ANPC-3P) converter, which can inject a sinusoidal current into the grid, balance the neutral point voltage, and regulate the energy storage system (ESS) current with reduced low-frequency ripple. Despite other applications, ANPC-3P inverter can be used in grid-tied renewable generation to allow the simultaneous connection of a photovoltaic (PV) energy source and an ESS to the AC grid. The ESS is connected directly to the inverter circuit without any auxiliary DC-DC converter, but due to the DC bus pulsed power, it can be subjected to low-frequency current ripple. This undesired current ripple is difficult to filter and can lead to shorter battery life. A control system based on well-known controllers is analyzed and designed. Theoretical analysis is validated experimentally using a single-phase 1-kW prototype.
Highlights
The insertion of renewable generation in the electrical grid arises some problems related to the undetermined availability of these sources [1]
This paper is organized as follows: Section 2 presents a review of the ANPC-3P topology; Section 3 is dedicated to the control system analysis and design; and Section 4 presents and discusses the experimental results of the proposed control strategy
The energy storage system (ESS) consists of 23 valve-regulated lead acid (VRLA)
Summary
The insertion of renewable generation in the electrical grid arises some problems related to the undetermined availability of these sources [1]. They are interesting for low power applications (
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