Wind Power Inverter Network Isolation Detection
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Solution Overview
Problem
Existing methods for identifying network isolation in wind power installations, which form separate networks, are inefficient and lack reliable detection mechanisms, often relying on unpredictable isolating switches and high installation efforts.
Innovation Solution
A method using current control and feedback mechanisms to detect deviations from a predetermined reference range, distinguishing between first-degree and second-degree separate network faults, and employing circuit breakers to manage output current in case of faults, ensuring quick identification and response to network isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolating switches are used to isolate wind farms from the electrical supply network, then network isolation can be achieved, but reliable detection of the isolation state becomes difficult
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring current control deviations from generation units and using this information to infer the isolation state of the network. The control system receives feedback about current deviations and adjusts its operation accordingly, enabling reliable detection of network isolation without direct sensing of isolating switch states.
Solution Approach 2:
The patent uses current control deviations as an intermediary indicator to detect network isolation. Instead of directly detecting the isolation state or installing sensors on isolating switches, the system monitors the behavior of generation units' current control as an indirect signal that reveals whether the network is isolated or connected.
2Reliability
If sensors are installed to detect isolating switch states, then isolation detection becomes possible, but installation effort and system complexity increase significantly
Solution Approach 1:
The patent enables the system to self-diagnose its isolation state by monitoring its own operational parameters (current control deviations). The generation units' control systems automatically detect isolation conditions through their existing current control mechanisms, eliminating the need for external sensors or additional detection infrastructure.
Solution Approach 2:
The patent extracts the isolation detection function from the physical isolating switches and transfers it to the control systems of generation units. By removing the detection requirement from the switch infrastructure and embedding it in the operational control logic, the system eliminates the need for additional sensors while maintaining detection capability.
3Reliability
If wind power installations reduce power output upon detecting isolation, then network stability is maintained, but response time is delayed due to slow isolation identification
Solution Approach 1:
The patent implements preliminary monitoring of current control deviations that continuously track network conditions. By maintaining this monitoring readiness in advance, the system can immediately identify isolation events when they occur, enabling rapid response without delayed detection or prolonged analysis periods.
Data Source
AI summary
A method for controlling a generating unit that feeds into an electrical supply system. The generating unit feeds into the electrical supply system using one or more converters or inverters. The method is provided for the purpose of detecting a system separation or formation of a separate system, and the method includes controlling the feed by a feed controller operating with at least one current controller, detecting at least one current control error and testing the detected current control error for a disparity from a predetermined reference range. The method includes identifying a system separation involving a separate system that is disconnected from the electrical supply system and to which the generating unit is connected if a disparity from the predetermined reference range has been detected.