Power Electronic Controller for Reactive Current Voltage Adjustment
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Solution Overview
Problem
In high voltage direct current (HVDC) power transmission and reactive power compensation systems, existing technologies face challenges in efficiently managing reactive current demands, leading to increased material and power loss costs due to fixed target voltage references in power electronic devices.
Innovation Solution
A controller for power electronic devices that adjusts the target voltage reference of energy storage devices based on reactive current demands, allowing for reduced module counts by increasing or decreasing voltage references according to capacitive or inductive reactive current conditions, thereby optimizing module usage and reducing material and power loss costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed target voltage reference is used in power electronic devices, then the device structure remains simple and stable, but material costs and power loss costs increase due to the inability to optimize module usage across varying operating points
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed target voltage reference to a dynamically adjustable one. The controller modifies the target voltage reference based on real-time operating conditions, specifically adjusting it according to the magnitude of reactive current demand. This dynamic adjustment allows the system to optimize its performance across varying operating points, reducing both material and power loss costs while managing the increased controller complexity through a straightforward adjustment mechanism.
2Quantity of substance
If the number of modules in the power electronic device is reduced, then material savings and power loss capitalization savings are achieved, but the device may lack sufficient capacity to meet peak reactive current demands
Solution Approach 1:
The patent applies parameter changes by adjusting the target voltage reference parameter based on operating conditions. Instead of increasing the number of modules to ensure sufficient capacity, the system changes the voltage reference parameter dynamically. When reactive current demand is high, the target voltage reference is increased, allowing existing modules to operate at higher voltage levels and meet peak demands without requiring additional modules, thus achieving both material savings and reliable capacity.
3Power
If the target voltage reference is increased to meet higher reactive current demands, then the reactive current capacity is improved, but the power loss and material costs increase
Solution Approach 1:
The patent applies dynamics by making the target voltage reference adjustable rather than fixed. The controller increases the target voltage reference only when reactive current demand requires it, and reduces it when demand is lower. This dynamic approach allows the system to maintain sufficient reactive current capacity when needed while minimizing power losses during normal operation, avoiding the continuous high power loss that would result from maintaining a constantly high voltage reference.
Data Source
AI summary
There is provided a controller for a power electronic device, the power electronic device including at least one module, the module including at least one switching element and at least one energy storage device, the switching element and the energy storage device in the module arranged to be combinable to selectively provide a voltage source, wherein the controller is programmed to adjust a target voltage reference of the energy storage device of the module responsive to a reactive current demand of the power electronic device.