Substation Fuel Cell Backup Power System

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Solution Overview

Problem

Electrical substations face challenges in maintaining both AC and DC power during prolonged grid interruptions, as traditional diesel generators have limited runtime and environmental constraints, leading to inefficiencies and equipment downtime during black start processes.

Innovation Solution

An integrated backup power system combining fuel cells and substation batteries with automated switching mechanisms to provide both AC and DC power, allowing for seamless transition between power sources during outages, eliminating the need for equipment retrofitting and reducing environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If diesel generators are used for backup power, then AC and DC power can be provided during outages, but runtime is limited and environmental constraints arise

Engineering Contradiction:

Improvebackup power availabilityVSAvoidgenerator runtime

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent combines a fuel cell system with a battery system to create an integrated backup power source. The fuel cell generates electricity through electrochemical reactions, while the battery stores energy, together providing extended runtime and reliable AC/DC power output during grid outages without the limitations of diesel generators

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the mechanical diesel generator system with an electrochemical system comprising a fuel cell and battery. This substitution eliminates combustion-based power generation, providing cleaner energy with unlimited runtime capability while maintaining the ability to supply both AC and DC power to substation equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If diesel generators are used for backup power, then power supply during outages is maintained, but environmental impact increases

Engineering Contradiction:

Improvepower supply continuityVSAvoidenvironmental impact

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the combustion-based diesel generator with an electrochemical fuel cell system that generates electricity through controlled chemical reactions. This substitution eliminates exhaust emissions, noise pollution, and other environmental harms associated with diesel combustion, while maintaining continuous AC and DC power supply to critical substation loads

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The fuel cell system operates using hydrogen or other clean fuels in a controlled electrochemical environment, producing only water and heat as byproducts. This creates a clean energy conversion process that maintains power supply reliability without generating harmful emissions or environmental contaminants

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Reliability

If equipment is retrofitted for backup power, then power availability improves, but device complexity and cost increase

Engineering Contradiction:

Improvepower availabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates the fuel cell and battery into a unified backup power system with automated control. The fuel cell and battery work together as a coordinated unit, with the fuel cell providing primary power generation and the battery providing energy storage and surge capacity, eliminating the need for separate generator installations and reducing overall system complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system incorporates automated switching mechanisms that automatically detect grid failures and switch between power sources without human intervention. The fuel cell system self-regulates its operation, managing its own startup, power output, and coordination with the battery, thereby reducing operational complexity and maintenance requirements compared to manually operated diesel generators

Inventive Principle:

Principle #25Self-service

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

Ensures continuous operation of critical substation equipment during prolonged outages by providing a reliable, scalable, and clean energy source, reducing the need for diesel generators and enhancing the efficiency of black start processes.

Implementation Method 1

The auxiliary power system includes a fuel cell and a battery (206). The fuel cell may be a hydrogen fuel cell. The hydrogen fuel cell converts hydrogen to electrical energy

Methodology Applied

Scientific EffectFuel cell electrochemical conversion: Fuel Cell

Implementation Method 2

The auxiliary power system includes a fuel cell and a battery (206)... The battery (206) may be a lead acid battery, a lithium ion battery, or another type of rechargeable battery

Methodology Applied

Scientific EffectBattery energy storage: Battery (electricity)

Data Source

PatentUS10536011B2Utility power grid substation auxiliary power system

Publication Date: 2020.01.14 SAN DIEGO GAS & ELECTRIC CO

AI summary

An auxiliary power system for electrical substations is provided. The auxiliary power system enables both AC and DC equipment to be powered during prolonged power outages, and utilizes a substation fuel cell to provide a backup power source for designated black start cranking path substations.