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Shunt active power filters (S-APF) are highly popular ways for harmonic compensation due to the high performance and simplicity of installation. S-APF is commonly controlled in current control mode with load harmonic current detection, which is not quite suitable for the distributed power generation system (DPGS) where the nonlinear loads are highly dispersed. Local harmonic voltage detection based...
This paper presents a dual-band 2×2 WiFi transceiver in 28nm bulk CMOS. Achieved receiver and transmitter EVM floor at 5GHz for 160MHz per channel are −35dB and −33dB, respectively. The 2.4GHz integrated PA provides 26.5dBm saturated output power while its 5GHz counterpart delivers 26dBm. The 2.4GHz receiver features mixer first architecture while the transmitter includes a 2nd harmonic notch for...
This paper presents an improved phase-shifted carrier pulse width modulation (PSC-PWM) scheme for the hybrid modular multilevel converter (MMC) consisting of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs). When the traditional PSC-PWM schemes for the HBSMs-based MMC and the FBSMs-based MMC are directly applied to the hybrid MMC, some mismatch pulses will occur on the arm voltages...
Modular multilevel converter (MMC) is regarded as one of the most promising topologies for the high-voltage high-power applications. However, reliability is one of the most important challenges for MMC which is composed of a large number of power electronics sub-modules (SMs). In order to increase the system reliability, redundant SMs are often utilized. A strategy is proposed in this paper to implement...
Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
The application of reduced common mode voltage pulse width modulation methods bring much high order harmonics to the variable speed drive system, which causes considerable iron loss inside the electric motor. In this paper, an improved iron loss model considering those high order harmonics is proposed. Iron loss coefficients are obtained based on experimental data by utilizing multiple linear regression...
In this paper, a two-microphone based voice activity detection (VAD) algorithm is proposed to detect the distant-talking speech coming randomly from a wide range of direction of arrival (DOA). The long-term information of inter-channel phase difference (LTIPD) is introduced as a target speech existence measure, which describes the concentration degree of DOA estimations on a sound source with harmonic...
The square wave inverter with adjustable filter is proposed for high speed motor power supply. The six-step square wave inverter can reduce the switching frequency which is beneficial to high frequency inverter due to the switching frequency limitation. The adjustable filter combines low-pass filter with band-blocking filters which have adjustable inductance. The band-blocking filters can adjust the...
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