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The operation of the PWM converter should be kept at low switching frequency so as to restrain the dynamic losses of the three-level converter and improve its output power. However, traditional control methods are no longer suitable for this condition with the resulting increasing output harmonic distortion and reduction of dynamic performance. To overcome the above problems, a novel complex matrix...
As a key area of international industrial transfer, service outsourcing has been widely studied, as value chain is an important theory. However, many existing researches are only on the global value chain; while few fruit was shown on value decomposition and integration analysis by the perspective of undertake service outsourcing. To full the blank, based on the value chain theory, this paper decomposes...
Shenzhen is a quickly growing city of immigrants. The diversity of its inhabitants' cultural backgrounds formed a diversity of social and cultural atmosphere, and culture circle of immigrant appeared in ShenZhen. It's the characteristic culture of ShenZhen, and worthy of protection in urban renewal. Based on analyzing the spatial characteristics of different immigrant cultural circle in Shenzhen,...
This paper develops a differential duopolistic game where goods are differentiated and prices are sticky and firms can invest in market-enlarging promotional activities by advertising which have a public good nature. Compared to the previous literatures, the novelty of this paper rests on the fact that this paper proposes the new assumption of the price adjustment speed is decided by the goodwill...
Based on the investigation and analysis of the situation in full mechanized coal mining face at home and abroad, the electro-hydraulic control system for hydraulic support is put forward, designed and realized. It adopted intrinsically safe circuit design technology and field bus technology to connect all control units to the host computer. Each control unit of the control system is equipped with...
In this paper, an over view of damping method for three-phase voltage-source PWM rectifier with LCL filter is given. The traditional rectifier connected to supply network with an L filter. Increasing the L value can attenuate the ripple current around switch frequency which fulfills standards but it will decrease the response speed and stability of the system. An LCL filter is more effective and reduce...
This 230 kA DC power source is composed of four set separated DC power in parallel operation. There are +3.75deg, -3.75deg, +11.25deg, -11.25deg phase shifting between each rectifier transformer and original source. Each set device mainly contains on-load tap changer, phase-shifting rectifier transformer and con-phase counter parallel rectifier. In this paper, a current control scheme is realized...
This 230 kA DC power source is composed of four set separated DC power in parallel operation. There are +3.75deg, -3.75deg, +11.25deg, -11.25deg phase shifting between each rectifier transformer and original source. Each set device mainly contains on-load tap changer, phase-shifting rectifier transformer and con-phase counter parallel rectifier. In this paper, a current control scheme is realized...
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