Modular PV Storage DC Bus Layout for Simpler Wiring

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Solution Overview

Problem

Existing photovoltaic energy storage systems face complex wiring, high installation costs, and low efficiency due to AC coupling between components, with independent modules leading to cumbersome connections and long energy transfer paths.

Innovation Solution

A photovoltaic energy storage system with modularized chambers, a DC bus, and integrated power conversion, photovoltaic, energy storage, and DC charging modules, utilizing a common DC bus for efficient energy transfer and simplified wiring through plug-in ports with detecting terminals for safe and reliable connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If independent modules (PV panels, power conversion systems, energy storage units) are used with AC coupling, then system adaptability is improved, but device complexity and wiring complexity increase

Engineering Contradiction:

Improvesystem adaptabilityVSAvoidwiring complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple independent modules (PV panels, power conversion systems, energy storage units, DC charging modules) into an integrated system connected by a common DC bus. This consolidation reduces the number of separate AC connections and simplifies the overall wiring architecture while maintaining system adaptability through modular design.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces a DC bus as an intermediary component that facilitates direct DC connections between all modules. This DC bus acts as a central mediator, replacing complex AC coupling wiring with simpler DC connections, thereby reducing wiring complexity while preserving module independence and adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If AC coupling is used to transfer energy between energy storage unit and power conversion system, then system reliability is improved, but energy transfer efficiency decreases

Engineering Contradiction:

Improvesystem reliabilityVSAvoidenergy transfer efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent replaces the AC coupling mechanism (which involves AC-DC conversion) with direct DC connections. By substituting the AC coupling system with DC bus connections, the patent eliminates unnecessary conversion steps, reducing energy losses while maintaining system reliability through proper DC protection and control mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If independent modules are used, then system adaptability is improved, but installation time and cost increase

Engineering Contradiction:

Improvesystem adaptabilityVSAvoidinstallation time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the system into standardized modular units (PV modules, energy storage units, power conversion systems, DC charging modules) that can be independently manufactured and assembled. The DC bus provides standardized connection interfaces, enabling rapid module assembly and reducing installation time while maintaining system adaptability through flexible module configuration.

Inventive Principle:

Principle #1Segmentation

4Reliability

If AC coupling is used, then safety protection is improved, but energy transfer path length increases

Engineering Contradiction:

Improvesafety protectionVSAvoidenergy transfer path length

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent extracts the AC coupling layer from the energy transfer path and replaces it with direct DC connections. By removing the AC conversion stage, the patent shortens the energy transfer path from 'PV/Storage → AC grid → Power conversion system' to 'PV/Storage → DC bus → Power conversion system', reducing path length while maintaining safety through DC-specific protection mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system achieves efficient, convenient installation and wiring, reduces safety hazards, and enhances electrical reliability by integrating modules with a common DC bus, shortening energy transfer paths and improving overall efficiency.

Implementation Method 1

at least one of a photovoltaic module, an energy storage module, and a DC charging module, the at least one of the photovoltaic module, the energy storage module, and the DC charging module coupled to the DC bus

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS20250337349A1Photovoltaic energy storage system

Publication Date: 2025.10.30 SHANGHAI SIGEYUAN INTELLIGENT TECH CO LTD

AI summary

The present application relates to the field of photovoltaic storage and charging technology, and specifically to a photovoltaic energy storage system, including at least two modularized chambers; a power conversion system coupled to a DC bus, and at least one of a photovoltaic module, an energy storage module, and a DC charging module; where the power conversion system is disposed in one of the modularized chambers; and at least one of the photovoltaic module, the energy storage module, and the DC charging module is disposed in another of the modularized chambers.