Direct Battery Coupling for Stable DC Bus Voltage Control
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Solution Overview
Problem
DC bus voltage instability due to sudden changes in power load, with existing systems experiencing limited electrical inertia and risk of voltage fluctuations beyond acceptable limits due to transmission delays in control signals.
Innovation Solution
An autonomous cooperative control system with a DC bus connected to multiple battery units, where each battery's terminal voltage matches the DC bus reference voltage, and a control circuit that switches the DC bus between assist driving and autonomous operation states to manage voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery is connected to the DC bus via a voltage conversion unit, then the battery can be integrated into the DC bus system, but the electrical inertia is reduced and voltage fluctuation prevention effectiveness is limited
Solution Approach 1:
The patent extracts the voltage conversion unit from the connection path between the battery and DC bus, enabling direct connection. This removes the intermediate component that was limiting electrical inertia, allowing the battery to directly provide voltage support and inertia to the DC bus while maintaining integration capability.
2Stability of the object's composition
If central control or distributed control is used to stabilize DC bus voltage, then voltage control can be achieved, but transmission delay causes voltage to temporarily fall below lower limit or exceed upper limit
Solution Approach 1:
The patent implements preliminary action by having the battery directly connected to the DC bus ready to immediately respond to voltage fluctuations. The direct connection ensures that when voltage deviations occur, the battery can instantly provide or absorb power without waiting for control signal transmission, preventing voltage from exceeding limits.
Solution Approach 2:
The battery serves as an intermediary element between the power load and the DC bus, providing immediate voltage support. This intermediary capability allows the system to handle sudden load changes without relying solely on delayed control signals from the central or distributed controller.
3Stability of the object's composition
If the DC bus has sufficient electrical inertia to handle sudden power load changes, then voltage stability is improved, but the system complexity increases
Solution Approach 1:
The patent enables the battery to serve itself by directly connecting it to the DC bus, allowing the battery to autonomously provide electrical inertia and voltage support. This self-service capability eliminates the need for complex control systems and intermediate components, achieving voltage stability through the battery's inherent properties rather than complex system architecture.
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
Enhances the stability of the power system by effectively preventing voltage fluctuations through increased electrical inertia, allowing the DC bus to maintain stability even with rapid changes in power load, thereby ensuring a stable operation.
Implementation Method 1
a plurality of battery units directly connected to the DC bus. The plurality of battery units is distributed and loaded on the DC bus
Data Source
AI summary
The stability of a power system using a DC bus is improved. According to an aspect of an embodiment of the invention, the following autonomous cooperative control system is provided. The autonomous cooperative control system includes a DC bus to which a power load and a generator are connected; and a plurality of battery units directly connected to the DC bus. The plurality of battery units are distributed and loaded on the DC bus. A terminal voltage of each battery unit is consistent with or approximates to a reference voltage of the DC bus.