Power Conversion Device Adaptive Output Topology
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Solution Overview
Problem
Existing power conversion devices cannot adapt to scenarios where grid-connected and standalone operations have inconsistent requirements, particularly failing to provide a single-phase three-wire output during standalone operations when designed for grid-connected single-phase two-wire outputs.
Innovation Solution
A power conversion device with an electric energy conversion module that includes a voltage-balanced half-bridge circuit and a bridge conversion circuit, coupled with bus capacitors, and a switching module to convert electric energy into either a single-phase two-wire or three-wire output, allowing for adaptive operation between grid-connected and standalone modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a converter with H6 topology is designed for grid-connected operation with single-phase two-wire output, then leakage current is reduced, but the converter cannot provide single-phase three-wire output during standalone operation
Solution Approach 1:
The patent applies universality by designing a converter that can perform multiple functions: it can operate in both grid-connected mode (single-phase two-wire output) and standalone mode (single-phase three-wire output). The converter topology is enhanced with additional switching elements and a neutral point clamp structure, enabling it to adapt to different operational requirements and provide appropriate output configurations for each mode without requiring separate dedicated converters.
Solution Approach 2:
The patent implements dynamics by making the converter topology reconfigurable through control of switching elements. The converter can dynamically switch between different operational states: in grid-connected mode, certain switches are controlled to achieve single-phase two-wire output with low leakage current; in standalone mode, the switching pattern changes to provide single-phase three-wire output. This dynamic reconfiguration allows the same hardware to adapt to varying operational demands.
2Reliability
If converter topologies are designed to meet specific operational requirements, then performance in that mode is optimized, but the converter cannot adapt to inconsistent requirements between grid-connected and standalone operations
Solution Approach 1:
The patent applies universality by designing a converter that can perform multiple functions: it can operate in both grid-connected mode (single-phase two-wire output) and standalone mode (single-phase three-wire output). The converter topology is enhanced with additional switching elements and a neutral point clamp structure, enabling it to adapt to different operational requirements and provide appropriate output configurations for each mode without requiring separate dedicated converters.
Solution Approach 2:
The patent implements dynamics by making the converter topology reconfigurable through control of switching elements. The converter can dynamically switch between different operational states: in grid-connected mode, certain switches are controlled to achieve single-phase two-wire output with low leakage current; in standalone mode, the switching pattern changes to provide single-phase three-wire output. This dynamic reconfiguration allows the same hardware to adapt to varying operational demands.
Data Source
AI summary
The present disclosure provides a power supply system and a power conversion device. The power conversion device is used for converting electric energy outputted by a power supply module, and the power conversion device includes an electric energy conversion module and a switching module. The electric energy conversion module is configured to convert the electric energy output from the power supply module into a single-phase two-wire output or a single-phase three-wire output, and includes a half-bridge circuit, a bridge conversion circuit and a neutral line. The switching module is coupled with the electric energy conversion module, and is configured to control the electric energy conversion module to provide the single-phase two-wire output or single-phase three-wire output.