Wind Power Converter Voltage Stabilization via Impedance Drop
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Solution Overview
Problem
Conventional wind power generation systems face challenges in maintaining system voltage stability over a wide voltage range, particularly during voltage lowering conditions, and require additional reactive power compensation devices that increase costs and affect power system stability.
Innovation Solution
A power converter apparatus is introduced that includes a system voltage detector and controller to stabilize system voltage by adjusting active and reactive current components of the output current, using a voltage drop due to impedance in the power system, thereby eliminating the need for reactive power compensation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive power compensation apparatus (SVC or STATCOM) is installed to stabilize system voltage, then system voltage stability is improved, but system cost increases
Solution Approach 1:
The patent combines the power conversion function with reactive power compensation function into a single integrated system. The power converter apparatus performs both active power transmission and reactive power compensation simultaneously, eliminating the need for separate SVC or STATCOM devices while maintaining system voltage stability.
Solution Approach 2:
The power converter apparatus is designed to perform multiple functions: it converts power from the wind generator, transmits active power to the grid, and simultaneously provides reactive power compensation to stabilize system voltage. This multi-functional design replaces dedicated reactive power compensation equipment.
2Reliability
If reactive power compensation apparatus is installed to maintain system voltage, then power system stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the reactive power compensation function into the existing power converter apparatus, eliminating the need for separate compensation devices. The controller manages both active and reactive power operations within a single integrated system, reducing overall device complexity.
3Productivity
If conventional reactive power control is used in wind power generation system, then power conversion is achieved, but system voltage stabilization capability is insufficient
Solution Approach 1:
The patent implements dynamic control of reactive power output based on real-time system voltage conditions. The controller adjusts the reactive current component dynamically according to voltage deviations, enabling the system to respond adaptively to voltage fluctuations and maintain stability across varying operating conditions.
Solution Approach 2:
The system incorporates feedback control where the controller continuously monitors system voltage and adjusts the reactive power output accordingly. This closed-loop control ensures that the power converter apparatus can maintain system voltage stability while performing power conversion.
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
The power converter apparatus effectively stabilizes system voltage across a wide range without the need for reactive power compensation devices, enhancing power system stability and reducing costs.
Implementation Method 1
a system voltage detector configured to detect a system voltage of the power system
Implementation Method 2
control an active current component and a reactive current component of an output current of the power converter apparatus to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system
Data Source
AI summary
There is provided a power converter apparatus including a detector detecting a system voltage, and a controller stably outputting power generated by the wind power generator to the power system based on a power instruction value and controlling an output voltage to stabilize the system voltage based on a voltage instruction value in a case where the system voltage is within a preset range, and controlling an active current component and a reactive current component of an output current to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage is outside the preset range.