Autonomous Power Generation Control via Converter Mode Switching
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Solution Overview
Problem
Existing electricity-generating devices using permanent magnet power generators face challenges in autonomous operation, particularly when system interconnection is difficult due to energy source insufficiencies, requiring additional costly devices like dummy resistor devices or high-speed guide vane control units.
Innovation Solution
The method involves operating the electricity-generating device along an efficiency-characteristics curve within a speed range from rated speed to maximum speed, utilizing a control unit to manage the operation of converters and inlet valves, enabling autonomous operation without additional hardware, by connecting and disconnecting loads and using the efficiency-characteristics curve of the energy source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electricity-generating device is interconnected to the electric power system, then the device can operate with stable power supply and grid support, but the device cannot operate autonomously when system interconnection is difficult or abnormal conditions occur
Solution Approach 1:
The control unit is designed to perform multiple functions: it controls the converters for normal grid-connected operation and automatically switches to autonomous operation mode when interconnection is difficult or abnormal conditions occur. This multi-functionality allows the device to adapt to both grid-connected and isolated operation scenarios without requiring separate control systems, thereby resolving the contradiction between reliability through grid connection and adaptability for autonomous operation.
2Adaptability or versatility
If additional devices like dummy resistor devices or high-speed guide vane control units are added to enable autonomous operation, then the device can operate independently when interconnection is difficult, but the installation complexity and costs increase
Solution Approach 1:
The existing control unit is enhanced to provide both grid-connected and autonomous operation capabilities through software control algorithms, eliminating the need for additional hardware devices like dummy resistor devices or high-speed guide vane control units. This approach enables autonomous operation while avoiding increased installation complexity and costs.
Solution Approach 2:
The invention replaces mechanical control systems (such as high-speed guide vane control units) with electronic control algorithms in the control unit. This substitution achieves the same autonomous operation functionality without requiring complex mechanical components, thereby reducing installation complexity and maintenance requirements.
3Adaptability or versatility
If additional devices like dummy resistor devices or high-speed guide vane control units are added to enable autonomous operation, then the device can operate independently when interconnection is difficult, but the costs increase
Solution Approach 1:
The control unit is designed to provide both grid-connected and autonomous operation modes using existing hardware components. By utilizing the same control unit for both operation modes through software algorithms, the invention eliminates the need for additional expensive devices, thereby reducing manufacturing costs while maintaining adaptability for autonomous operation.
Solution Approach 2:
The invention replaces expensive mechanical control systems with cost-effective electronic control algorithms. This substitution achieves autonomous operation capability without requiring costly additional hardware, thereby improving ease of manufacture while maintaining the desired adaptability.
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
This approach allows for autonomous operation with energy balance within the rated speed range, eliminating the need for specialized devices like dummy resistor devices or high-speed guide vane control units, ensuring continuous operation even when system interconnection is challenging.
Implementation Method 1
a permanent magnet power generator 3, which are coupled through bearings 4
Implementation Method 2
first converter (inverter) 11, a second converter 12
Data Source
AI summary
When it is not possible for a power generation device to operate coupled to an electric power system, an autonomous operation of connection and disconnection of a load of the power generation device is performed along an efficiency-characteristics curve within a speed range from a rated speed to a maximum speed in the efficiency-characteristics curve of an energy source. During the autonomous operation, an aperture command is outputted to an inlet valve of a water turbine and a first converter is operated in a converter mode when an operation preparation command is outputted by a control unit, a second converter is operated in an inverter mode when a voltage is established by of a DC linkage unit, and the load is connected when the operation preparation is completed.