Power Control System Dynamic Load Sharing

Solution Overview

Problem

Traditional power control systems, such as those using the droop control method, lack flexibility and robustness in determining power sharing during transient and steady-state conditions, leading to system interruptions and electrical component failures due to varying load demands.

Innovation Solution

A power control system that includes an energy storage device, an engine-driven electrical machine, and a power converter, with a controller that determines the power sharing proportion based on characteristic data from these components to optimize power supply to a load device, adjusting between transient and steady-state conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If droop control method is used for power sharing, then implementation simplicity is improved, but system reliability and adaptability deteriorate during transient conditions

Engineering Contradiction:

Improveimplementation simplicityVSAvoidsystem reliability during transient conditions

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The control system dynamically adjusts power sharing proportions based on real-time operating conditions. The controller switches between different control strategies (droop control for steady-state, optimized control for transient conditions) to adapt to changing system demands, thereby maintaining reliability while managing complexity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes control parameters based on operating conditions. During transient conditions, the controller modifies power sharing proportions and control gains to optimize system response, whereas during steady-state, it uses standard droop control parameters, thus improving reliability without permanently increasing system complexity.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If droop control method is used for power sharing, then implementation simplicity is improved, but adaptability to varying load demands worsens

Engineering Contradiction:

Improveimplementation simplicityVSAvoidadaptability to varying load demands

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The control system dynamically adjusts power sharing proportions based on real-time operating conditions. The controller switches between different control strategies (droop control for steady-state, optimized control for transient conditions) to adapt to changing system demands, thereby maintaining reliability while managing complexity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes control parameters based on operating conditions. During transient conditions, the controller modifies power sharing proportions and control gains to optimize system response, whereas during steady-state, it uses standard droop control parameters, thus improving reliability without permanently increasing system complexity.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If traditional power control system is used, then device complexity is reduced, but system robustness during transient conditions deteriorates

Engineering Contradiction:

Improvecontrol system complexityVSAvoidsystem robustness during transient conditions

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The control system is segmented into different control modes for different operating conditions. The controller identifies whether the system is in transient or steady-state and applies appropriate control strategies separately, managing complexity through functional segmentation rather than a single complex control algorithm.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control system dynamically adjusts power sharing proportions based on real-time operating conditions. The controller switches between different control strategies (droop control for steady-state, optimized control for transient conditions) to adapt to changing system demands, thereby maintaining reliability while managing complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10389128B2Power control system

Publication Date: 2019.08.20 ROLLS ROYCE CORP

AI summary

A power control system for providing power sharing is provided. An energy storage device is configured to supply a first portion of power of an electrical power as a total load power and an engine-driven electrical machine is configured to supply a second portion of power of the total load power. A power converter is electrically coupled to the energy storage device and the engine-driven electrical machine such that the power converter is configured to supply the total load power to an electrical load device. A controller is coupled to the power converter and the controller receives characteristic data from at least one of the energy storage device, the engine-driven electrical machine, and the electrical load device. Based on the received characteristic data, the controller determines a power sharing proportion of a power sharing amount of each of the first portion of power and the second portion of power of the total load power to be supplied via the power converter to the electrical load device.