Wind Turbine Generator Protection via Normally Closed Relay
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Solution Overview
Problem
Conventional wind-power generator control systems require external power sources for protection, leading to power consumption issues and potential damage from excessive current or power generation, as they often rely on short-circuiting which can cause resistance and damage.
Innovation Solution
A wind-power generator control system incorporating a normally closed relay connected between output terminals, controlled by a unit that uses grid power to determine when to short-circuit or open-circuit, along with current and power estimation to manage output and prevent overloading, and a resistor unit to dissipate excess power, ensuring efficient operation and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external power sources (battery or capacitor) are used to maintain generator short-circuit protection, then the generator can be protected during maintenance, but the power source is consumed over time and cannot maintain the short-circuit state long-term
Solution Approach 1:
The system uses itself to provide protection by utilizing the generated power from the generator to control the relay. When the generator produces sufficient power, it automatically controls the normally closed relay to maintain short-circuit protection without needing external power sources. This eliminates battery consumption while maintaining protection capability.
2Reliability
If the generator short-circuits to prevent damage from excessive current or power, then the generator system is protected, but large resistance is generated which may cause damage
Solution Approach 1:
Instead of using a normally open relay that closes to create a short-circuit (which generates harmful resistance), the patent uses a normally closed relay that opens to create the protective effect. The relay is normally closed, allowing current flow, but opens when control signal is received, providing protection without the harmful resistance of a forced short-circuit.
3Reliability
If a normally closed relay controlled by grid power is used to dynamically control short-circuiting, then external power sources are eliminated and protection is improved, but the system becomes more complex
Solution Approach 1:
The normally closed relay acts as an intermediary component that simplifies the control logic. By using a normally closed relay instead of a normally open one, the system achieves protection with simpler control - the relay automatically opens when powered, providing protection without complex control circuits. The grid power directly controls the relay coil, and the relay's normally closed contact provides the protective function.
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 system effectively manages power output and prevents damage by dynamically controlling the relay and dissipating excess power, reducing the need for external power sources during protection modes and minimizing risk of overloading.
Implementation Method 1
a normally closed relay, connected between the first output terminal and the second output terminal; and a control unit, transmitting a control signal to the normally closed relay
Implementation Method 2
a resistor unit; and a wind turbine rotation speed detection unit, wherein when the rotation speed is greater than a threshold rotation speed, the control unit outputs a part of the power output to the resistor unit
Data Source
AI summary
A wind-power generator control system is provided. The wind-power generator control system includes a wind turbine, a power generator, a normally closed relay, and a control unit. The wind-power generator has a first output terminal and a second output terminal, and outputs a power output via the first and second output terminal when the wind turbine rotates. The normally closed relay is connected between the first and second output terminals. The control unit transmits a control signal to the normally closed relay by grid power. Also, when the normally closed relay does not receive the control signal, the first output terminal short-circuits the second output terminal by the normally closed relay for protecting the wind-power generator. When the normally closed relay receives the control signal, the first output terminal open-circuits the second output terminal by the normally closed relay for providing the power output.