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Single-phase PWM rectifier, grid connected PV inverter system, static synchronous compensator (STATCOM) all can be implemented by an H-bridge inverter and a large electrolytic dc capacitor to absorb the ripple power pulsating at twice the line frequency (2ω ripple power). This paper proposed a generalized active power decoupling method for H-bridge with minimum voltage and current stress. By adding...
A six-switch solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is conventionally realized by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 10 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of a six-switch converter with two ports...
Three-phase ac systems can be transferred into dq axis, where stability analysis becomes much simpler. In order to apply the stability criterion in AC system, an equivalent DQ admittance model for the ATRU system has been developed in this paper, based on the ABC impedance model in paper [1]. Compared to the literature work, this model has two better features: (1) it is valid in a wide frequency range,...
A new solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is traditionally implemented by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 20 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of an H-bridge and an additional phase leg connected...
Three-phase ac systems can be transferred into dq axis, where stability analysis becomes much simpler. In order to apply the stability criterion in AC system, an equivalent DQ admittance model for the three-phase diode rectifier has been developed in this paper, based on the ABC impedance model in paper [1]. Compared to the literature work, this model has two better features: (1) it is valid in a...
The sale system of the online cosmetic store is based on a B2C marketing mode, providing users with functions of register, login, query and view goods, order, leaving messages, comments and other personalized service. The consumers can not only browse cosmetics of this website and order them online, but also make comments and choose personalized packages. The technical plan is JSP+Tomcat+SQL Server...
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