Synchronous generator protection
AssigneeEmpire Technology Development LLC
InventorKallianpur Rajmohan Padiyar
Life of this patent
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Abstract
A scheme for synchronous generator protection is provided. Based on generator input and transformer output phase information, along with the energy function concept, the scheme for synchronous generator protection provides early detection of a loss of synchronism of a generator. As such, the generator with loss of synchronism can be tripped before the generator actually slips. An example for how such a synchronous generator protection schemes may function, is also provided.
Claims20
A method for synchronous generator protection, comprising:
- acquiring a generator power input containing a first phase value;
- acquiring a transformer output containing a voltage value and a second phase value;
- calculating a phase difference between the first phase value and the second phase value, a transient power value, and a steady state power value;
- and
- determining whether a synchronous generator is stable based on the phase difference, and the relationship between the transient power and steady state power values.
A synchronous generator system, comprising:
- a generator for generating an input having an input phase value;
- a transformer for converting the input into a transformer output having a voltage value and a second phase value;
- and
- a subsystem for calculating a phase difference between the input phase value and the output phase, a transient power, and a steady state power, wherein the subsystem further determines if the synchronous generator system is stable based on the phase difference, and the relationship between the transient power and steady state power.
A method for synchronous generator protection, comprising:
- acquiring a generator input containing a three-phase input;
- performing a dq0 transform on a current component and a reference of the three-phase input;
- outputting a direct current and a quadrature current from the dq0 transform;
- calculating a transient power and a phase difference using the generator input, the direct current and the quadrature direct current;
- acquiring a steady state power by passing the transient power through a low-pass filter;
- and
- determining whether a synchronous generator is stable based on a behavior of the phase difference, and the relationship between the transient power and steady state power values.
Dependencies are inferred from the claim text.