Power System Stabilizer for Voltage Source Converters
AssigneeUniversity of South Florida
InventorsLINGLING FAN, ZHIXIN MIAO
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Abstract
Devices and methods for mechanism-based feedback controller employed in a wind powered power system are provided. A controller can include a vector control-based voltage source converter with feedback control circuitry. The feedback control circuitry is configured to modulate either a power order or a dc-link voltage order to control coupling between voltage and power. The controller can be connected to a wind-based turbine generator of a wind farm and regulate power deployed to a power grid.
Claims17
A controller system for a wind-based power system, the controller comprising:
- a vector control-based voltage source converter configured to have feedback control circuitry;
- wherein the feedback control circuitry is configured to modulate either a power order or a dc-link voltage order,
- wherein a first input signal into the controller system is an alternating current (AC) voltage, and
- wherein the feedback control circuitry is configured such that a change in magnitude of the AC voltage is used as an input into the feedback control circuitry to modulate the power order or the dc-link voltage order.
A controller system for a wind-based power system, the controller comprising:
- a vector control-based voltage source converter configured to have feedback control circuitry;
- wherein the feedback control circuitry is configured to modulate either a power order or a dc-link voltage order,
- wherein a first input signal into the controller system is an alternating current (AC) voltage,
- wherein the feedback control circuity is configured to reduce coupling between an active power and a voltage at a point of common coupling,
- wherein a second input signal into the controller system is a d-axis converter current.
- wherein the first input signal into the controller system is a voltage at a point of common coupling,
- wherein the controller system is configured to modulate either the power order or the dc-link voltage order by using the d-axis converter current.
- wherein the controller is further configured to modulate either a power order or a dc-link voltage order by using the voltage at a point of common coupling,
- wherein the controller system further comprises:
- an integrator;
- and
- a high pass filter connected to the integrator,
- wherein the integrator and the high pass filter are configured to modulate the dc-link voltage order,
- wherein the controller system is connected to a wind-powered turbine generator or a weak grid power system,
- wherein the controller system is configured for Type-3 wind or Type-4 wind, and
- wherein the first input signal is a phase-locked-loop (PLL) voltage of the controller system.
Dependencies are inferred from the claim text.