Bidirectional DC DC Converter Voltage Compatibility Solar Storage

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Solution Overview

Problem

Existing solar energy systems face challenges in integrating energy storage due to voltage incompatibility between solar PV systems and energy storage devices, requiring costly and engineering-intensive retrofitting, and existing solutions do not account for variable solar output voltages or provide efficient energy management.

Innovation Solution

A bidirectional DC DC converter is introduced to manage energy flow between solar PV arrays, energy storage systems, and grid-tied inverters, incorporating maximum power point tracking (MPPT), voltage conversion, and intelligent transfer functions to match electrical characteristics, allowing for efficient energy storage and release while minimizing disruption and cost.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a bidirectional DC DC converter is introduced to enable voltage conversion between PV arrays and energy storage systems, then adaptability and ease of integration are improved, but device complexity increases

Engineering Contradiction:

Improvevoltage compatibilityVSAvoidconverter complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bidirectional DC DC converter serves as an intermediary device between the PV array and energy storage system, mediating the voltage incompatibility issue. It converts between the high voltage DC from PV arrays and the lower voltage DC from batteries, enabling integration without direct connection between incompatible voltage sources.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The converter is designed with multi-functionality to handle both charging and discharging operations, providing voltage conversion in both directions. This universal design allows a single device to replace what would otherwise require multiple specialized components for different operating modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If existing solar systems are retrofitted with energy storage systems, then energy management flexibility is improved, but manufacturing cost and engineering effort increase

Engineering Contradiction:

Improveenergy management flexibilityVSAvoidretrofit cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The energy storage integration is segmented into modular components: the bidirectional DC DC converter as a standalone unit, the energy storage system as a separate module, and the PV array interface. This segmentation allows for incremental retrofitting without requiring complete system replacement, reducing overall retrofit costs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system incorporates dynamic voltage matching capabilities that adapt to varying PV output conditions. The converter dynamically adjusts its operation to match the instantaneous voltage characteristics of the PV array, enabling seamless integration without fixed voltage requirements and reducing engineering complexity.

Inventive Principle:

Principle #15Dynamics

3Productivity

If maximum power point tracking is implemented during energy storage charging, then energy harvesting efficiency is improved, but control complexity increases

Engineering Contradiction:

Improveenergy harvesting efficiencyVSAvoidcontrol complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The MPPT control function is merged with the bidirectional DC DC converter's existing control architecture. Rather than adding a separate MPPT system, the converter's control unit integrates both voltage conversion and maximum power point tracking functions, reducing overall control complexity while maintaining high harvesting efficiency.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables seamless integration of energy storage into solar energy systems, optimizing energy harvesting and release, reducing engineering effort and costs, and providing flexible energy management to align with utility grid demands.

Implementation Method 1

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11444542B2Method of operating a bidirectional DC DC converter

Publication Date: 2022.09.13 EIQ ENERGY INC

AI summary

Method of operating a bidirectional DC DC converter that transfers power among an energy source (for example, a solar PV array), an energy storage system, and an energy usage system (for example, a DC AC inverter) to control the charge and discharge times of the energy storage system so that power harvested during peak energy source production can be stored and can later be released to the energy usage system at predetermined times.