Direct storage hybrid (DSH) inverter: A new concept of intelligent hybrid inverter

Abstract

This paper proposes a new configuration of a singlephase hybrid inverter with an integrated battery energy storage, which is suitable for residential households to maximize local consumption of solar energy and thus reduce dependency on grid support. The hybrid inverter is called Direct Storage Hybrid (DSH) Inverter. A transformer-less topology such as HERIC, operating at low frequency to generate a three-level rectangular output voltage, is adopted to connect a photovoltaic (PV) panel to the load and/or the grid. A series active filter is employed to compensate the high harmonic components from the rectangular voltage and provide a sinusoidal voltage. A bidirectional dc/dc converter connects the battery to the PV panel to control the battery state of charge (SoC) and optimize the PV panel operation during both off-grid and grid-connected modes. The DSH inverter can let the battery bypass the dc/dc converter and connect directly to the inverter stage, leading to a significant improvement in throughput efficiency in battery utilization. This paper discusses the operation and loss analysis of the DSH inverter in off-grid mode.

A Power Balanced Control Model for Energy Storage Integration with Distribution Network

“…When the grid voltage is high, it absorbs limited photovoltaic power, stabilizes the grid voltage, and prevents the inverter from shutting down due to excessive voltage; On the other hand, when the grid voltage is low, the amount of electricity is released regularly to ensure that the photovoltaic power generation is not abandoned. With the increase in photovoltaic power generation capacity, the use of products such as intelligent hybrid inverters [5] and energy storage devices is also gradually increasing. Nevertheless, the financing, sizing, and other factors make it unsuitable for the end-of-the-grid application.…”

Fuzzy Pi Controller Based Single Phase Hybrid Inverter for Domestic Applications

“…Overall as discussed by H A Pham N et.al [5] in general for domestic applications we have much of PV and battery resource only. So the hybrid inverter which we use is based on this topology.…”