This paper investigates the lock range of injection-locked non-harmonic oscillators using a frequency-domain approach. By representing a non-harmonic oscillator with a set of harmonic oscillators, the intrinsic relation between the lock range of the harmonic oscillators and that of the non-harmonic is obtained. We show that non-harmonic oscillators exhibit a larger lock range as compared with h...

The superconducting magnetic levitation railway system (MAGLEV) under development in Japan uses a pulsewidth-modulation (PWM) inverter for driving a linear synchronous motor (LSM). The inverter output voltage contains non-negligible harmonics which cause harmonic resonances in the LSM system, and therefore harmonics of the output voltage have been analyzed in order to control such harmonic reso...

A novel current injection network for low-harmonic rectifiers that apply the third harmonic current injection is proposed in this letter. The current injection network requires one inductor, two capacitors, and one 1 : 1 transformer with voltampere rating of only 0.16% of the input power. The transformer is introduced to provide complete rejection of harmonic components of the injected currents...

Traveling Wave Tube (TWT) amplifiers, used in communication and ECM applications for their high power output, are nonlinear devices. This leads to harmonic and intermodulation distortion in the output spectrum which compromises the device performance. In communication systems, intermodulation products (IMPs) lead to adjacent channel interference while in ECM applications, harmonic generation ad...

A multiphase harmonic load flow algorithm is developed based on backward/forward sweep to examine the effects of various factors on the neutral to earth voltage (NEV), including unsymmetrical system configuration, load unbalance and harmonic injection. The proposed algorithm composes fundamental frequency and harmonic frequencies power flows. The algorithm and the associated models are tested o...

This paper proposes a method to improve the output torque of six-phase permanent-magnet synchronous machine (PMSM) within same current peak limit through fifth-harmonic injection into each phase stator. Compared fifth + seventh-harmonic current-injection used PMSM, control system can be stably controlled, and controller design complexity decreased. is because harmonic component was converted di...

This paper proposes a novel modulation scheme to reduce the harmonic content of voltages and currents caused by modular multilevel converters with embedded battery cell when employed for application in energy storage systems grid. The reduction total distortion (THD) is obtained injecting selected harmonics modulating wave phase disposition sinusoidal pulse width modulation. main innovation fre...

In this paper, two algorithms have been developed for allocation and size determination of Active Power Filters (APF) in power systems. In the first algorithm, the objective is to minimize harmonic voltage distortion. The objective in the second algorithm is to minimize the new APF injection currents while satisfying harmonic standards. Genetic algorithm is proposed for these two optimization p...

In this paper, two algorithms have been developed for allocation and size determination of Active Power Filters (APF) in power systems. In the first algorithm, the objective is to minimize harmonic voltage distortion. The objective in the second algorithm is to minimize the new APF injection currents while satisfying harmonic standards. Genetic algorithm is proposed for these two optimization p...