Voltage controller having phase-compensated harmonic regulator

1 . A voltage controller of a microgrid, the voltage controller comprising:

a first circuit configured to

detect a voltage spike in an electrical signal received from an electrical power source of the microgrid,

wherein the voltage spike is caused by a step change in a load of the microgrid,

wherein the voltage controller is implemented using a single-loop control system in a stationary reference frame, and

wherein the electrical signal comprises harmonics caused by the load of the microgrid; and

a phase-compensated harmonic regulator configured to:

receive a feedback voltage of the single-loop control system,

wherein the feedback voltage is a delayed version of an instantaneous voltage of the electrical signal;

regulate the harmonics present in the electrical signal; and

sub-transiently stabilize the instantaneous voltage into a steady-state voltage based on the feedback voltage within a single cycle after the circuit detects the voltage spike,

wherein the steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion, and

wherein the steady-state voltage has a balanced sinusoidal waveform; and

a second circuit configured to cause the electrical power source to provide the electrical signal having the steady-state voltage to the microgrid.

2 . The voltage controller of claim 1 , wherein the single-loop control system comprises a control component and a plant component,

wherein the control component comprises the phase-compensated harmonic regulator, and

wherein the plant component is configured to provide the feedback voltage to the phase-compensated harmonic regulator.

3 . The voltage controller of claim 1 , wherein the phase-compensated harmonic regulator is configured to regulate only one of a positive frequency component or a negative frequency component of the voltage harmonics.

4 . The voltage controller of claim 1 , wherein the voltage controller comprises:

a pulse-width modulator configured to:

control an amount of electrical power delivered to the microgrid.

5 . The voltage controller of claim 1 , wherein the threshold total harmonic distortion is about 2%.

6 . The voltage controller of claim 1 , wherein the voltage controller is configured to regulate at least one of a magnitude or a phase of the instantaneous voltage.

7 . The voltage controller of claim 1 , wherein the phase-compensated harmonic regulator is configured to:

perform current-mode control of the instantaneous voltage of the electrical signal.

8 . A computer-implemented method of operating a voltage controller of an uninterruptible power supply, the method comprising:

detecting, using a resistive-capacitive circuit of the voltage controller, a voltage spike in an electrical signal received from the uninterruptible power supply,

wherein the voltage controller is implemented using a single-loop control system in a stationary reference frame, and

wherein the electrical signal comprises voltage harmonics caused by a load of the uninterruptible power supply;

receiving a delayed version of an instantaneous voltage of the electrical signal in accordance with the single-loop control system;

regulating, using a phase-compensated harmonic regulator of the voltage controller, the voltage harmonics present in the electrical signal; and

sub-transiently stabilizing the instantaneous voltage into a steady-state voltage based on the delayed version of the instantaneous voltage for providing the electrical signal having the steady-state voltage to the load of the uninterruptible power supply.

9 . The computer-implemented method of claim 8 , wherein the voltage spike is caused by a step change in the load of the uninterruptible power supply, and

wherein the load of the uninterruptible power supply is a non-linear or unbalanced load.

10 . The computer-implemented method of claim 8 , comprising:

causing the uninterruptible power supply to provide the electrical signal having the steady-state voltage to a datacenter.

11 . The computer-implemented method of claim 8 , wherein the steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion.

12 . The computer-implemented method of claim 8 , wherein the steady-state voltage has a balanced sinusoidal waveform.

13 . The computer-implemented method of claim 8 , wherein sub-transiently stabilizing the instantaneous voltage is performed within a single cycle after the voltage controller detects the voltage spike.

14 . The computer-implemented method of claim 8 , wherein the phase-compensated harmonic regulator regulates only one of a positive frequency component or a negative frequency component of the voltage harmonics.

15 . A grid-forming inverter comprising:

at least one hardware processor; and

at least one non-transitory computer-readable storage medium storing instructions, which, when executed by the at least one hardware processor, cause the grid-forming inverter to:

detect, using a resistive-capacitive circuit, a power surge in electrical power generated by the grid-forming inverter,

wherein the grid-forming inverter is implemented using a single-loop control system in a stationary reference frame, and

wherein the electrical power comprises voltage harmonics caused by a load of the grid-forming inverter;

receive a delayed version of an instantaneous voltage of the electrical power in accordance with the single-loop control system;

regulate, using a phase-compensated harmonic regulator, the voltage harmonics present in the electrical power; and

sub-transiently stabilize the instantaneous voltage into a steady-state voltage based on the delayed version of the instantaneous voltage.

16 . The grid-forming inverter of claim 15 , wherein the instructions cause the grid-forming inverter to filter, using an inductive-capacitive filter, specific frequencies of the steady-state voltage.

17 . The grid-forming inverter of claim 15 , wherein the steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion.

18 . The grid-forming inverter of claim 15 , wherein the steady-state voltage has a balanced sinusoidal waveform.

19 . The grid-forming inverter of claim 15 , wherein sub-transiently stabilizing the instantaneous voltage is performed within a single cycle after detecting the power surge.

20 . The grid-forming inverter of claim 15 , wherein the phase-compensated harmonic regulator regulates only one of a positive frequency component or a negative frequency component of the voltage harmonics.