Charging Station Power Ramp Control for Islanded Grids

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Solution Overview

Problem

Island electrical networks face challenges in prolonging the lifespan of batteries and diesel generators due to excessive usage, leading to increased maintenance and operational costs, with batteries being subjected to deep discharge and generators experiencing uneven load, which can shorten their lifespan and disrupt network stability.

Innovation Solution

A method for operating island networks that involves a charging station controlled by limit gradients to manage the feed-in power from wind turbines and diesel generators, ensuring gentle operation by limiting power changes and maintaining a stable state of charge, thereby reducing wear and tear on both battery and generator systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the charging station operates without limit gradients to maximize energy storage and release, then energy supply reliability is improved, but battery lifespan deteriorates due to deep discharge and excessive wear

Engineering Contradiction:

Improveenergy supply reliabilityVSAvoidbattery lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The charging station operates dynamically by adjusting its charge and discharge behavior based on real-time grid conditions and battery state of charge. Limit gradients are implemented to constrain the rate of power change, preventing excessive deep discharge cycles while maintaining energy supply reliability through adaptive control strategies.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters by introducing limit gradients that constrain the rate of power change during charging and discharging. These parameter constraints prevent the battery from operating in extreme states that would reduce lifespan, while still allowing sufficient flexibility to maintain energy supply reliability under varying grid conditions.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the charging station frequently charges and discharges to balance grid fluctuations, then grid stability is improved, but battery lifespan deteriorates due to increased cycle wear

Engineering Contradiction:

Improvegrid stabilityVSAvoidbattery lifespan

Core Design Contradiction:

Stability of the object's compositionVSDuration of action of stationary object

Solution Approach 1:

The charging station employs dynamic control with limit gradients that adapt to grid conditions. Rather than responding to every fluctuation, the system selectively responds to significant grid instability events, reducing unnecessary charge-discharge cycles that would wear the battery while still maintaining grid stability when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system applies partial action by not responding to all grid fluctuations equally. Limit gradients constrain the frequency and magnitude of charge-discharge cycles, allowing the battery to participate in grid stabilization only when necessary and within safe operational limits, thereby extending battery lifespan while providing sufficient grid support.

Inventive Principle:

Principle #16Partial or excessive action

3Speed

If the charging station releases power rapidly during high demand, then energy supply responsiveness is improved, but battery lifespan deteriorates due to high discharge rates

Engineering Contradiction:

Improveenergy supply responsivenessVSAvoidbattery lifespan

Core Design Contradiction:

SpeedVSDuration of action of stationary object

Solution Approach 1:

The charging station implements dynamic power release control through limit gradients on the discharge rate. The system responds to high demand conditions by increasing discharge power, but the limit gradient constrains the maximum rate of change, preventing excessively rapid discharge that would damage the battery while still maintaining adequate energy supply responsiveness.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If the charging station operates without power change limits to maximize flexibility, then operational versatility is improved, but diesel generator lifespan deteriorates due to uneven load and excessive wear

Engineering Contradiction:

Improveoperational flexibilityVSAvoiddiesel generator lifespan

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The charging station uses dynamic limit gradients to balance operational flexibility with generator protection. The limit gradients allow the system to adapt to varying operational conditions while constraining the rate of power change that would cause uneven loading on the diesel generator, thereby extending generator lifespan without significantly reducing operational versatility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3210276B1Methods for operating a separate power supply system

Publication Date: 2025.01.22 WOBBEN PROPERTIES GMBH

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AI summary

The invention relates to methods for operating an electrical charging station (8) in an electrical power supply system (1) comprising, in addition to electrical consumers (2), at least one regenerative power generator (6), at least one fossil fuel-operated conventional generator (4) and at least the electrical charging station (8) for storing and discharging electrical power, wherein the charging station (8) is controlled in such a way that the variation of the power injected over time is limited.