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This paper proposes an active low-frequency ripple control device (ALFRCD) based on virtual capacitor concept for building-integrated photovoltaic (BIPV) systems. With this method, the power quality of the BIPV system can be enhanced, and the lifetime and reliability are superior by reducing electrolytic capacitors. The low-frequency ripple current caused by the single-phase
DOI: 10.1109/TPEL.2013.2271247 Corpus ID: 39209378; An Active Low-Frequency Ripple Control Method Based on the Virtual Capacitor Concept for BIPV Systems @article{Cai2014AnAL, title={An Active Low-Frequency Ripple Control Method Based on the Virtual Capacitor Concept for BIPV Systems}, author={Wen Cai and Bangyin Liu and Shanxu
dielectric capacitors. Whereas Kapton often gets praised for its unprecedentedly high resistance at the beginning of exploitation, the reliability of such capacitors is low. Our newly elaborated method explains the reasons beyond such a behavior and provides convincing molecular mechanisms of the damages. Methodology
The concept, control method, self-power scheme, and impedance characteristics of the active capacitor are presented. A case study of the proposed active capacitor
A two-terminal active capacitor concept has been proposed recently based on an active power electronic circuit with a voltage control method and self-power scheme. It retains the convenience of use as a passive capacitor with two power terminals only without any additional required connections and has the potential to either increase power density or reduce design cost
The idea of implementing capacitors with DC/AC power converters (also called inverters) is proposed and demonstrated and active capacitors outperform passive capacitors in terms of tolerance, stability with respect to time and temperature. In this paper, the idea of implementing capacitors with DC/AC power converters (also called inverters) is proposed and
Several practical design issues need to be addressed to carry on the two-terminal active capacitor concept proposed in . Firstly, the design constraints, including the functionality, efficiency, cost and reliability aspect considerations, are still open questions. Secondly, the dynamic response of the active
This paper addresses the design constraints, impedance modeling, and start-up solutions of two-terminal active capacitors of an active power electronic circuit with a voltage control method and self-power scheme. A two-terminal active capacitor concept has been proposed recently based on an active power electronic circuit with a voltage control method
Good capacitor design involves making well-informed trade-offs among multiple desired characteristics to achieve a balanced performance that appeals to the widest
This paper proposes a generalized modulation method with capacitor voltage balance capability for the n-level neutral-point-clamped (NPC) converter. Firstly, the capacitor voltage model is analyzed and established. To improve the utilization of DC-link voltage, a suitable zero-sequence voltage is selected and injected into the original modulation signals.
The method provides reliable computational predictions for known capacitor setups and can be validated through spectroscopic techniques, such as Fourier-transform
Then, a thorough algorithm for dc bus capacitor design is provided. The application of the proposed design method is demonstrated through several design examples.
A new computational method is herein discussed to systemize the development of new dielectric capacitor designs. The method predicts the identities and amounts of (1) gaseous products of decomposition, (2) the volume of the emerged solid phase, coined soot, (3) the band gaps of the soot samples, and (4) the electrical conductivity of the soot. The predictions can be made by
The exception is multilayer SMD stacked capacitor Rubycon PMLCAP(R) that employs electron beam curing resin as the dielectric material and vacuum deposition polymerization
Based on the previously proof-of-concept study, this paper addresses the design constraints, impedance modeling, and start-up solutions of two-terminal active capacitors. A design method for functionality, efficiency, lifetime and cost constraints application is applied to size the active
Fig. 17. Stability test of the ALFRCD based on virtual capacitor with disturbance: (a) power variation of the single-phase inverter; (b) dc-bus voltage variation in the BIPV system. - "An Active Low-Frequency Ripple Control Method Based on the
Fig. 14. Simulation of ALFRCD based on virtual capacitor at 2000-W output power: (a) steady-state waveform of inverter input current, dc-bus current, and ALFRCD current; (b) frequency distribution. - "An Active Low-Frequency Ripple Control Method Based on the Virtual Capacitor Concept for BIPV Systems"
Concurrent design places domain experts in one site to facilitate collaboration, interaction, and joint decision-making, and to ensure all disciplines are equally considered. It is supported
The allowable region and design methods of the inverter controller parameters which are combined with the active damping and grid voltage feedforward strategies are described in detail. the concept of ''virtual capacitor'' has been introduced, which replaces the physical capacitors with virtual capacitors by reshaping the feedback
Traditional active capacitors can often only be used in small and medium-power occasions, and the active capacitors designed in this paper can use the theory of difference
A design method for functionality, efficiency, lifetime and cost constraints application is applied to size the active components and passive elements. A voltage feed
Concept and Computational Method Vitaly V. Chaban Yerevan State University, Yerevan, 0025, Armenia. E-mail: vvchaban@gmail . Abstract. A new computational method is herein discussed to systemize the development of new dielectric capacitor designs. The method predicts the identities and amounts of (1) gaseous
Metalized-film dielectric capacitors provide lump portions of energy on demand. While the capacities of various capacitor designs are comparable in magnitude, their stabilities make a difference. Dielectric breakdowns – micro-discharges – routinely occur in capacitors due to the inevitable presence of localized structure defects. The application of polymeric dielectric
A new computational method is herein discussed to systemize the development of new dielectric capacitor designs. The method predicts the identities and amounts of (1) gaseous products of
• Power modules, Bus bar, Cooling, Gate drivers and Capacitors can now be optimally designed together in one step to answer electrical, mechanical and thermal challenges of the system.
Request PDF | On May 1, 2014, Wen Cai and others published An Active Low-Frequency Ripple Control Method Based on the Virtual Capacitor Concept for BIPV Systems | Find, read and cite all the
Based on the resonance-free capacitor concept, this paper proposes a method to tune a passive filter to mitigate these resonances while providing the reactive power compensation required by the
This paper presents design methods to configure a shunt capacitor as a C-type filter or a third-order high-pass filter with guaranteed resonance-free performance. The concept of resonance-free condition is first introduced in this paper. It is then used to develop filter design methods that always meet the resonance-free condition.
From Eqs. (2-4) and (2-5), it can be seen that in addition to the low-frequency fluctuating power Q 1 (t) and Q 2 (t) in the system, there is also the power Q e (t) generated by V 1 and I 1, V 2 and I 2.The active capacitors designed in this article use LCL filters that can eliminate reactive power at specific frequencies in the system without introducing additional
Based on the previously proof-of-concept study, this paper addresses the design constraints, impedance modeling, and start-up solutions of two-terminal active capacitors. A design method for
Efficiency is one of the design constraints for active capacitor, which depends on the implementation.
Several practical design issues need to be addressed to carry on the two-terminal active capacitor concept proposed in . Firstly, the design constraints, including the functionality, efficiency, cost and reliability aspect considerations, are still open questions.
The circuit diagram of an active capacitor with conventional start-up solution. ESR = = + R2 (29) I2 n=2 nC1! 3) ESL: ESL of the active capacitor contains two parts: one is LC1, which is the ESL of C1, and the other one is the parasitic inductance of the auxiliary circuit, Laux, depending on the physical layout design of the active capacitor.
Power electronic converters implemented with the active capacitors could achieve either increased power density or reduced design cost for a given reliability specification, as discussed in . Several practical design issues need to be addressed to carry on the two-terminal active capacitor concept proposed in .
Therefore, from the control aspect, it enables fully independent operation of the active capacitor without any feedback signals from external circuits. The control method shown in Fig. 1 is to modulate the voltage vC3 to be out of phase with the ripple components in vC1 and same amplitude.
The case study reveals that two-terminal active capacitors become attractive for applications with a relatively high relia-bility requirement. There are application scenarios that passive capacitor based solutions show superior performance in terms of design cost.