Power Generator Voltage Drooping Control for Stable Parallel Operation
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Solution Overview
Problem
Conventional power generation systems face challenges in performing stable parallel operations between different types of power generators or between power generators and system power supplies due to mismatched voltage drooping characteristics, leading to unbalanced load sharing and excessive current issues, particularly when synchronous and induction power generators are involved.
Innovation Solution
A control method and system that dynamically adjust the output voltage and voltage drooping characteristics of power generators to match each other, allowing for stable parallel operation by changing the voltage drooping characteristic of one generator to coincide with another, thereby maintaining balanced load sharing and preventing excessive current during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage drooping characteristics of different types of power generators are adjusted to match, then stable parallel operation is achieved, but original performance of the power generators cannot be exerted
Solution Approach 1:
The patent applies dynamics by making the voltage drooping characteristic adjustable rather than fixed. The control system dynamically changes the voltage drooping characteristic of the first power generator according to operational requirements, allowing it to adapt between independent operation (maintaining original performance) and parallel operation (matching characteristics for stability).
Solution Approach 2:
The patent changes the voltage drooping characteristic parameter of the first power generator from its original fixed value to an adjusted value that matches the second power generator's characteristic. This parameter change enables the first generator to operate in parallel without sacrificing its ability to maintain original performance when operating independently.
2Adaptability or versatility
If synchronous power generator operates with induction power generator in parallel, then power supply flexibility is improved, but inrush current exceeds rated current value causing operation failure
Solution Approach 1:
The patent applies preliminary action by adjusting the voltage drooping characteristic of the synchronous power generator before it connects to the induction power generator in parallel. This pre-adjustment ensures that when the induction generator is applied, the inrush current is limited to within the rated current value, preventing operation failure while maintaining power supply flexibility.
Solution Approach 2:
The patent applies preliminary anti-action by configuring the voltage drooping characteristic in advance to counteract the harmful inrush current effect. The adjusted drooping characteristic acts as a preventive measure that limits the starting current of the induction generator, thereby preventing the harmful effect of excessive current before it occurs.
3Ease of operation
If voltage drooping characteristic is adjusted for parallel operation, then load sharing balance is achieved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a control system that can handle both independent operation and parallel operation modes. The same control system adjusts the voltage drooping characteristic based on the operational mode, making it multi-functional rather than requiring separate systems for different operation types.
Solution Approach 2:
The patent applies feedback by using a control system that monitors the operational state and automatically adjusts the voltage drooping characteristic accordingly. The control system receives feedback about whether the power generator is operating independently or in parallel, and responds by setting the appropriate drooping characteristic to maintain load sharing balance.
Data Source
AI summary
In a control method performed in shifting a plurality of different types of power generators to parallel operation, at least one of output voltage and a voltage drooping characteristic of at least one of the plurality of power generators is changed. In the case where the plurality of different types of power generators are a plurality of synchronous power generators having different voltage drooping characteristics, the voltage drooping characteristic of one power generator having a smaller voltage drooping characteristic among the plurality of power generators to be operated in parallel is changed so as to coincide with the voltage drooping characteristic of the other power generator. At the time of changing the voltage drooping characteristic, the other power generator is controlled so that the output voltage thereof is maintained at a value before start of the parallel operation.