2results about How to "Improve ripple" patented technology

A novel tapless resonant push-pull photovoltaic energy storage inverter topology is disclosed, relating to the field of energy storage system topology control technology, specifically a novel tapless resonant push-pull photovoltaic energy storage inverter topology. It includes a photovoltaic boost MPPT circuit, a DC-AC bidirectional inverter circuit, and a battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit. The photovoltaic boost MPPT circuit is used to increase the DC voltage of the photovoltaic panels and perform maximum power point tracking control. The DC-AC bidirectional inverter circuit performs bidirectional DC-to-AC conversion through three independent T-type three-level circuits, each independently controlled, with low harmonic output current. The battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit includes a tapless transformer and a push-pull circuit. Through innovative tapless resonant push-pull circuit, dual-transformer interleaved control technology, and three-level inverter circuit design, it achieves efficient power conversion, optimized battery charge and discharge management, and reduced high-frequency ripple and electromagnetic interference, thereby improving the overall efficiency, stability, and reliability of the photovoltaic energy storage system.

This invention discloses a unified vector timing construction method for ripple optimization of multi-parallel converters. This method constructs a near-three-voltage vector set based on a reference voltage and generates a basic vector sequence library by progressively varying the total number of conducting switching devices in parallel branches, forming a unified modulation framework applicable to any number of parallel converters. Based on the basic vector sequence library, a symmetrical vector timing unit is constructed, and by repeatedly expanding this basic unit, a complete vector timing sequence applicable to any number of parallel converters is formed. Furthermore, the switching timing sequence of each parallel branch is determined based on the complete vector timing sequence. Two types of triangular carrier initial angle configuration schemes and two complementary modulation waves and their corresponding operating modes are proposed to generate the switching timing sequence of each parallel branch. This method optimizes output current ripple while providing modulation degrees of freedom for optimizing other performance indicators.