Selective power oscillation damping control system with damping ratio dynamic gain and method for the same
AssigneeMitsubishi Electric Power Products, Inc.
InventorsDavid Edward Roop, Samantha Ann Morello, Tamojit Chakraborty
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Abstract
A system and method to selectively pass and damp oscillations in an electric power grid via a controller of a power electronic device irrespective of the modes of the power oscillations. The system and method includes multiple limiters having dynamic limits that are openable and closeable to control the response of the controller, damping ratio dynamic gain control logic that determines a dynamic gain for a control signal based on the oscillation characteristics of one or more input signals, and pulse counter logic to selectively control at least one of the limiters based on the pulse count of the control signal.
Claims21
A power oscillation damping system for an electric power grid, comprising:
- a power electronic device configured to generate active power or reactive power, or regulate the electric power grid;
- and
- a controller configured to selectively pass and damp oscillations of one or more input signals from the electric power grid, the controller being coupled to memory and being configured to:
- generate a power oscillation damper (POD) control signal based on the one or more input signals;
- determine a dynamic gain based on an amplitude of the oscillations, a duration of the oscillations, and a rate of damping of the oscillations in the one or more input signals;
- apply the dynamic gain to the POD control signal to modify the amplitude of the POD control signal;
- input the POD control signal having the dynamic gain into an output signal limiter having dynamic limits that are openable and closeable, the dynamic limits defining a maximum output of the controller;
- count, via a counter, each pulse in the POD control signal with respect to time, the pulse being a rising edge of the POD control signal that deviates in a positive direction or a negative direction from zero;
- selectively open and close the dynamic limits of the output signal limiter based on a pulse count with respect to time;
- and
- output the POD control signal in response to the output signal limiter being opened.
A computer-implemented method to selectively pass and damp oscillations in an electric power grid via a power electronic device, comprising:
- generating, via a controller, a power oscillation damper (POD) control signal based on one or more input signals from the electric power grid;
- determining a dynamic gain based on an amplitude of the oscillations, a duration of the oscillations, and a rate of damping of the oscillations in the one or more input signals;
- applying the dynamic gain to the POD control signal to modify the amplitude of the POD control signal;
- inputting the POD control signal having the dynamic gain into an output signal limiter having dynamic limits that are openable and closeable, wherein the dynamic limits define a maximum output of the controller;
- counting, via a counter, each pulse in the POD control signal with respect to time, wherein the pulse is a rising edge of the POD control signal that deviates in a positive direction or a negative direction from zero;
- selectively opening and closing the dynamic limits of the output signal limiter based on a pulse count with respect to time;
- and
- outputting the POD control signal in response to the output signal limiter being opened.
A non-transitory computer readable medium comprising executable instructions for performing a computer-implemented method to selectively pass and damp oscillations of an electric power grid via a power electronic device, comprising:
- generating, via a controller, a power oscillation damper (POD) control signal based on one or more input signals from the electric power grid;
- determining a dynamic gain based on an amplitude of the oscillations, a duration of the oscillations, and a rate of damping of the oscillations in the one or more input signals;
- applying the dynamic gain to the POD control signal to modify the amplitude of the POD control signal;
- inputting the POD control signal having the dynamic gain into an output signal limiter having dynamic limits that are openable and closeable, wherein the dynamic limits define a maximum output of the controller;
- counting, via a counter, each pulse in the POD control signal with respect to time, wherein the pulse is a rising edge of the POD control signal that deviates in a positive direction or a negative direction from zero;
- selectively opening and closing the dynamic limits of the output signal limiter based on a pulse count with respect to time;
- and
- outputting the POD control signal in response to the output signal limiter being opened.
Dependencies are inferred from the claim text.