Active Power Filtering TRIZ Cases

See how operation limiting prevents power overload when active filters fail, protecting facilit

See how a built-in active filter detects external load information to suppress harmonic current

Real power injection regulates CMMI capacitor voltages to suppress zero-sequence and neutral current imbalance in three-phase grids.

Phase-corrected harmonic voltage control lets an active filter suppress harmonics even when grid impedance shifts between inductive and capacitive.

A third inverter leg cancels PWM ripple, cutting grid filter size while maintaining low THD and reducing EMI in single-phase inverters.

Adjusted harmonic current and voltage compensation improves grid power quality grading accuracy and response speed under varying conditions.

Liquid coolant removes high thermal loads from switching assemblies while insulating barriers prevent ionization and maintain enclosure voltage isolation.

Uses synchronous-frame phase current and q-axis error control to stabilize grid-frequency estimation and active power response in weak grids.

Thyristor thrupass and bypass paths cut converter-inverter losses while maintaining continuous power during source interruptions.

Capacity-based current splitting lets paralleled 3-wire and 4-wire AHFs share zero and non-zero compensation currents more fully.

Independent DC-link voltage control decouples module dynamics in cascaded multilevel converters and supports fault isolation under unequal loads.

Converter control signals drive an AC-side energy buffer or load to absorb or supply power before HVDC operating changes destabilize the grid.

Independent active filter control uses existing grid voltage and current signals to damp low-frequency converter oscillations without complicating the main loop.

Integrating current-limiting inductors as transformer secondary windings cuts space, cost, and EMC issues in AC grid stabilization.

A shunt active power filter with adaptive control cuts rectifier harmonics in aircraft AC-DC conversion while reducing weight and size.

Isolated or converted distortion signals let multiple active filters cooperate without reference potential noise or current flow.

A pumped liquid cooling block removes heat from high-current switching assemblies while electrical isolation prevents coolant ionization.

AC-component voltage sensing balances phase-module DC currents to prevent transformer saturation, losses, overheating, and noise.

A series isolation unit and parallel resonant branches suppress higher and background harmonics in high-voltage grids without active control.

Direct voltage sensing and a biquadratic filter cut active-filter latency, suppressing harmonic resonance before voltage swings damage equipment.

When coolant gets too cold, injected current harmonics heat converter switches to prevent freezing while allowing lower antifreeze use.

Dynamic DC-link voltage and over-modulation control help wind turbines ride through grid overvoltage while limiting harmonics and IGBT stress.

A bi-directional converter with reactive power compensation and active harmonic filtering helps wind power subsystems meet grid requirements.

Auxiliary windings coupled to high-voltage throttles add capacitive support, enabling one compact reactor to deliver both inductive and capacitive reactive power.

Control hybrid power flow to balance renewable supply, storage, loads, and grid demand.

A power conversion device coordinates fundamental wave and harmonic control functions using a limiting circuit for voltage command generation.