Generator Power Quality Verification Using Impedance Measurement
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Solution Overview
Problem
Existing generator systems face challenges in verifying power quality and compatibility with consumers without requiring significant adaptation or costly adjustments, especially for synchronous machines that feed power directly into the grid.
Innovation Solution
A method involving an impedance measurement between the generator system and consumer terminals to determine the ratio of positive and negative sequence current values, using a device with switches and an evaluation unit to assess power quality and symmetry, allowing for cost-effective compatibility testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual adjustment of phases is implemented in synchronous machines, then power quality can be improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent introduces a measurement device as an intermediary between the generator system and the grid. This device measures impedance values and determines power quality parameters without requiring direct modification of the generator phases. The measurement device acts as a mediator that provides power quality verification through indirect measurement rather than direct intervention, thus avoiding the complexity of phase adjustment mechanisms.
2Reliability
If connection adaptations are made to verify compatibility, then power quality verification reliability is improved, but manufacturing cost increases considerably
Solution Approach 1:
The measurement device performs self-service by autonomously measuring impedance values and determining power quality parameters. The device includes processing circuitry that automatically analyzes the measured impedance to determine active power, reactive power, and power factor without requiring manual connection adaptations or external verification procedures. This self-service capability ensures reliable verification while avoiding additional manufacturing costs for connection modifications.
Solution Approach 2:
The patent replaces mechanical connection adaptations with an electrical measurement system. Instead of physically modifying connections to verify compatibility, the invention uses electrical impedance measurement and signal processing to determine power quality parameters. This substitution of mechanical verification methods with electrical measurement techniques maintains verification reliability while eliminating the need for costly connection adaptations.
3Reliability
If impedance measurement is performed, then local influences at connection are reduced, but measurement precision requirements increase
Solution Approach 1:
The measurement device serves as an intermediary that isolates the measurement process from local connection influences. By measuring impedance through this intermediate device rather than directly at the connection point, the system reduces the impact of local electrical conditions on the measurement. The device's design inherently compensates for connection variations, allowing reliable power quality determination without requiring extremely high measurement precision.
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
Enables reliable verification of power quality and compatibility with consumers, reducing local influences and facilitating troubleshooting while avoiding direct phase adjustments, thus ensuring efficient and cost-effective compliance with safety standards.
Implementation Method 1
an impedance is provided between the terminals and wherein it is determined on the basis of an impedance value measured during operation of the generator system whether a predetermined power is provided by the generator system
Data Source
Figure 1
AI summary
The present invention relates to a method for checking the power quality of a generator system, in particular a grid generator system, and a corresponding device. Accordingly, a method for checking the power quality of a generator system is proposed, wherein a terminal of the generator system is electrically connected to a terminal of a consumer, wherein an impedance is provided between the terminals, and wherein, based on an impedance value measured during operation of the generator system, it is determined whether a predetermined power is being provided by the generator system.