Hybrid Power Stabilization System with Capacitor and Battery

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Solution Overview

Problem

Power storage apparatuses in system stabilization systems, such as lead-acid batteries, deteriorate due to repeated charging and discharging, leading to reduced capacity and shortened lifespan, and existing solutions fail to effectively manage the relationship between power storage and capacitors to minimize these cycles.

Innovation Solution

A system stabilization system comprising a power storage apparatus and a capacitor, controlled by a control apparatus that prioritizes capacitor charging/discharging for short-term fluctuations and power storage for longer-term fluctuations, reducing the number of charge/discharge cycles of the power storage apparatus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the power storage apparatus is used to suppress power fluctuations by charging and discharging in response to control, then the power system stabilization function is achieved, but the power storage apparatus deteriorates due to repeated charging and discharging cycles

Engineering Contradiction:
Improvepower system stabilization functionVSAvoidpower storage apparatus lifespan
Core Design Contradiction:
ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention segments the power fluctuation suppression function between two distinct components: a capacitor apparatus for short-term fluctuations and a power storage apparatus for medium-to-long-term fluctuations. The control apparatus divides the control period into a first period (capacitor active) and a second period (power storage apparatus active), allowing each component to operate in its optimal range and reducing unnecessary cycling of the power storage apparatus.

Inventive Principle:
Principle #1Segmentation

2Reliability

If the power storage apparatus responds to all power fluctuations including short-term variations, then comprehensive power stabilization is achieved, but the number of charge/discharge cycles increases causing early deterioration

Engineering Contradiction:
Improvepower fluctuation suppressionVSAvoidcharge/discharge cycle frequency
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The invention dynamically adjusts the response strategy based on the time characteristics of power fluctuations. The control apparatus identifies whether fluctuations are short-term (within the control period) or medium-to-long-term (exceeding the control period) and selectively engages the appropriate storage component, optimizing the operational productivity of each component based on real-time conditions.

Inventive Principle:
Principle #15Dynamics

3Reliability

If the power storage apparatus is controlled to track medium-and long-term power fluctuations, then effective fluctuation suppression is achieved, but the mutual relationship control with capacitor is insufficient leading to excessive charging/discharging

Engineering Contradiction:
Improvefluctuation suppression effectivenessVSAvoidcontrol coordination complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The control apparatus continuously monitors power fluctuations and provides feedback to determine the appropriate response strategy. By detecting whether power fluctuations exceed the control period threshold, the system feedback-controlledly switches between capacitor-only mode and coordinated power storage apparatus mode, achieving effective fluctuation suppression while maintaining manageable control complexity through clear decision logic.

Inventive Principle:
Principle #23Feedback

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

This approach prolongs the lifespan of the power storage apparatus by minimizing its charge/discharge cycles and effectively stabilizes the power system by utilizing the capacitor's faster response to absorb short-term fluctuations, thereby extending the system's operational life.

Implementation Method 1

a capacitor apparatus configured to suppress power fluctuations in the power system by making the charge/discharge response to the control faster than the power storage apparatus and charging or discharging in response to the control

Methodology Applied
Scientific EffectCapacitance: Capacitance

Implementation Method 2

a power storage apparatus configured to suppress power fluctuations in the power system by charging or discharging in response to a control

Methodology Applied
Scientific EffectElectrical energy storage: Battery (electricity)

Data Source

PatentEP2752955B1Power system stabilization system
Publication Date: 2017.11.22 HITACHI LTD
  • EP2752955B1 patent drawingFigure 1
  • EP2752955B1 patent drawingFigure 2
  • EP2752955B1 patent drawingFigure 3~4

AI summary

A system stabilization system for suppressing a power fluctuation in a power system, the system stabilization system including: a power storage apparatus configured to suppressing a power fluctuation in the power system by either charging or discharging in response to a control; a capacitor apparatus configured to suppress a power fluctuation in the power system by making the charge/discharge response to control faster than the power storage apparatus and charging or discharging in response to the control; and a control apparatus configured to control the power storage apparatus and the capacitor apparatus so as to reduce occurrences of charging or discharging in the power storage apparatus.