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A multiterminal Energy Interconnection System Based on MMC was developed, which connected active sub-modules, DC grids and AC grids. However, the power imbalance of the active sub-modules exists in this system, for example, inconsistent maximum power points of the PV panels will lead to system power loss. In order to solve the problem, this paper first presents a power control scheme between the three-terminals,...
Doubly fed induction generator (DFIG) based wind turbines have been dominating wind market in the past decade, due to the better balance between variable speed operation and the drive converter size in terms of the unique drive topology. However, the difficulties of low voltage ride through (LVRT) fulfillment are threatening this type of turbine technology, out of the limits of current and voltage...
This paper will introduce the suitable power module for 3-level neutral-point-clamped converter from the cost-performance and electric performance. As a conclusion, CM1200HC-90R developed by Mitsubishi Electric is selected for a 3MW 3-level NPC converter. And the power loss for this application is also calculated.
This paper will introduce an advanced intelligent power module (IPM) for PV-inverter application, which is newly developed by Mitsubishi Electric and called as PV-IPM. According to the simulation results, the power loss of the new PV-IPM is lower, so the PV-inverter using new PV-IPM could have high efficiency. Moreover, the integrated drive IC and protection functions make the application of new PV-IPM...
This paper presents the design and implementation of a laboratory grid simulator which is used to test the grid-connected devices according to the strict standards. Three-phase four-leg inverter with direct voltage control in Natural Frame is adopted in this grid simulator, which significantly reduces the computing and realizing complexities. Proportional and resonant controller is utilized to regulate...
In this paper, two high-resolution medium-bandwidth single-loop 4th-order single-bit sigma-delta modulators using a feed-forward and a feedback topology respectively are implemented in 0.13μm CMOS technology. The oversampling ratio is 50 with 312.5kHz input bandwidth, 14.66-bit and 16.62-bit resolution have been reached. The two circuits each consume about 8-mW from a single 1.2V supply voltage. After...
In this paper, several techniques which relax circuit requirements of building blocks are presented to effectively realize wideband high-resolution cascade sigma-delta modulator. Three cascade structures have been proposed in this paper. First, a MASH 2-2 with feed-forward topology in both stages has been explained to obtain low-distortion property and remove subtraction Second, a flexible SMASH 2-2...
In this paper, a high-resolution medium-frequency single-loop fourth-order 1-bit sigma-delta modulator is implemented in 0.18 ??m CMOS technology. The modulator has been presented with an oversampling ratio of 50, clock frequency of 31.25 MHz, 312.5 kHz bandwidth, and achieves a peak SNR of 101.7 dB, which is 16.6-bit resolution, 103 dB dynamic range. The whole circuits consume 58.55-mW from a single...
In high-speed DSP system, the source and load reflections depend on how well the output impedance and the load impedance are matched with the characteristic impedance, respectively. The reflected signal leads to ring, crosstalk and EMI thus degrade system performance and destroy the signal integrity. In the design process of high-speed data processing system based on TMS320DM642, the boundary condition...
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