Dc-Ac Conversion Without Reversal TRIZ Cases

Phase-shifted multilevel sub-pulses in cascaded bridges cut switching losses, reduce harmonics, and improve power balance.

dq conversion of AC capacitor current enables early open-failure detection in parallel inverter capacitors, limiting harmonic outflow.

Correcting ARCPI boosting time with a calculated value and lookup table improves current accuracy despite saturable inductor nonlinearity.

Controlled short-circuit discharge turns wasted intermediate-circuit energy into thermal aging detection for inverter components.

Neutral point PWM control balances split-phase loads to prevent neutral surges, overheating, and excess power loss.

Modified switching instants generate a balancing voltage component that keeps floating-cell DC intermediate voltage in range and reduces harmonics.

A synchronization adjusting unit aligns voltage amplitude, frequency, and phase before GFL-to-GFM switching to prevent output fluctuations.

Instantaneous voltage command control uses phase voltage and line current feedback to suppress overcurrent during abrupt grid changes.

By tracking changes between updated and prior estimated duty ratios, this case detects voltage sensor faults despite temperature and aging drift.

Adjacent power conversion units share ground to pass synchronization signals sequentially, cutting isolation modules and easing IC integration.

Different switching frequencies across converter stages cut switching losses and drive power while preserving precise AC waveform control.

A shared AC/DC UPS uses bidirectional inverters and isolated transformers to avoid separate units, stranded capacity, and load-mix inflexibility.

Superimposed control, clock, and data signals cut terminal count while preserving alarm priority and reliable identification in power conversion circuits.

When MMC power output is low, combined circulating-current and auxiliary voltage control keeps cell capacitor voltage stable and avoids control failure.

Online pulse-pattern shifts balance neutral point potential and filter cell voltages, improving converter output quality even at zero power factor.

A shared ground resistor and switched discharge path safely drain capacitor charge while cutting resistor loss, cost, and installation space.

A Delta-Q control approach updates reactive power in real time to limit voltage violations and fluctuations caused by abrupt solar irradiance changes.

Multiple communicable power modules create redundant bypass signal paths, keeping a cascade converter running through module faults with simpler control.

PWM-controlled neutral current routing compensates split-phase load imbalance to prevent surges, overheating, shutdowns, and power loss.