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The power factor (PF) and grid current distortion are two major issues for the promotion of variable frequency drive system with small film capacitors. This paper proposes an inverter current control method to shape the inverter current following grid current, and hence high PF can be obtained. Considering the cutoff effect of diode rectifier, the main components of the
Free QuoteResearch and development of wireless power transfer (WPT), which is attractive for charging mobile ob-jects such as electric vehicles (EVs) and mobile items, is in progress. In particular, it is useful for EV equipped with a large battery to charge easily. However, it requires high power charging and high efficiency of the WPT system. In general, to improve the efficiency of WPT,
Free QuoteKeywords: Control Allocation, Online Optimization, Fast Real-Time Optimization, Scalable Control, MMC, Capacitor Voltage Balancing, Scalable Model 1. INTRODUCTION 1.1 Control Allocation: from aeronautics to a diversification of the application fields The control method studied in this paper is a control allocation (CA) method. The objective of
Free QuoteFigure 1 is an illustration of the capacitor bank control philosophy. The SEL-734 continuously The SEL-734 control logic offers the following methods for energizing and de-energizing capacitor banks: • Automatic control operation modes − Three-phase average power factor control
Free QuoteCapacitive impedance control enables a power converter to mimic the voltage-current characteristics of a physical passive capacitor actively; however, existing impedance control methods cannot achieve accurate capacitive control due to parameter errors. This digest proposes a capacitive impedance control method with adaptive parameter capability, which is
Free QuoteChanging the capacitor value changes the amplitude and phase shift of the current in the auxiliary winding. Reducing the capacitor value lowers the torque values of the torque vs. speed curve as shown below. This method
Free QuoteThis paper presents a parallel capacitor (PC) control strategy to enhance the LVRT and HVRT capability of PMSG. Furthermore, this study presents a method for the sizing of a PC system for the reduction of the overvoltage of the DC-link during voltage sags and swell.
Free QuoteDOI: 10.1016/j.egyr.2021.12.055 Corpus ID: 245599886; Suppression control strategy of MMC sub-module capacitor voltage in variable-frequency situation @article{Li2022SuppressionCS, title={Suppression control strategy of MMC sub-module capacitor voltage in variable-frequency situation}, author={Zecheng Li and Lei Bo and Jinyang Bai and Bo Yang and Dongxu Zhu},
Free QuoteSwitched-capacitor (SC) converters are a type of variable structure systems. In the past, most of the SC converters were initially introduced for the low power applications and monolithic integration. Recently, SC converters have been used in high power area with the open-loop control and some other simple linear voltage feedback controls. However, the simplicity of
Free Quote1 INTRODUCTION. Nowadays, interior permanent magnet synchronous motor (IPMSM) has been widely used in industrial and white home applications due to their superior efficiency, power density, and torque-to
Free QuoteIn order to improve the low-frequency operation performance (including the start-up process and the low-speed running state) and simplify the control algorithm of the
Free QuoteSwitched-capacitor (SC) converter is a type of variable structure systems. SC converters are typically equipped with open-loop control or some linear feedback control methods. However, these approaches provide slow dynamic response speed, small operation region, and large voltage ripple. Some new nonlinear control methods have been proposed in the literature to
Free QuoteInsert the control variables that represent the capacitor locations randomly between 0 and 1 in both cases of fixed and switched capacitors. Z.S. Hussain, Methods comparison for optimal capacitor placement in distribution system, in 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon
Free QuoteA novel control strategy for voltage balancing of flying capacitor multilevel converters controlled with phase shifted SPWM is presented. Based on the polarity of the phase current, a relatively
Free QuoteThis paper proposes a phase-shift interleaving control method for variable-phase switched-capacitor (SC) converters that can perform voltage conversions with little electromagnetic interference
Free QuoteThe main contribution of this paper is the use of an optimal CA method to determine the MMC control ac- tions for active capacitor balancing.
Free Quotespeed control, the Auto tuning Vacuum Capacitors (Auto-VCs), the Fixed Vacuum Capacitors (FVCs) that assures a high accuracy of capacitance tolerance rate of ±1%, and the Vacuum Variable Capacitors (VVCs), which its current capacity is 400Arms. 3 What is a VC? The VC is a capacitor with the electrode gap in a vacuum.
Free QuoteThis study adopts the method of third order harmonic voltage injection (THVI) to move the peak value of a reference voltage toward the high capacitor voltage and increase the utilization rate of
Free QuoteThis paper proposes a voltage balancing control method using variable capacitors with simple turn-on adjusting function for multi-stage FET bidirectional converter. The proposed voltage balancing control circuit is composed of a feedback circuit using photocouplers and a delay circuit using variable capacitors with turn-on adjusting diodes. The proposed voltage balancing circuit
Free QuoteAbstract The paper introduces a novel, scalable control allocation (CA) formulation for active capacitor balancing of the Modular Multilevel Converter (MMC). The
Free QuoteRequired Practical: Charging & Discharging Capacitors Aim of the Experiment The overall aim of this experiment is to calculate the capacitance of a capacitor. This is just one example of how this required practical might be
Free QuoteCurrently, the solutions of this problem can mainly be divided into two categories, one is the sorting method [10-12] which is located in the modulation layer; the other is
Free QuoteTL;DR: In this article, a variable-capacitance capacitance capacitor with a temperature controller is proposed to achieve a large change in variable capacitance in the presence of a phase
Free QuoteThe method of choosing the optimal values of the capacitance of a capacitor of an active filter (AF) and the use of two different control methods of an AF to compensate for
Free QuoteA variable-frequency constant-current control (VFCCC) method with the constant ON-time is proposed in this paper for a switched-capacitor (SC) converter-based
Free QuoteTherefore, the DC voltage control of MMC not only needs to control the total DC voltage but also balances the capacitor voltages of each sub-module, so as to ensure the
Free QuoteThe electrolytic capacitor-less variable frequency drive scheme using film capacitors to replace electrolytic capacitors has been partially applied in the field of washing machines and air conditioners driven by permanent magnet synchronous motors, due to its advantages of good reliability and low cost. However, recently, with the development and
Free QuoteFurthermore, the dual-degree control (DDC) method is proposed to utilize the structural framework and dual control variables of the proposed PET to meet out significant aspects of EV charging
Free QuoteThis paper presents a nonlinear constant on-time variable frequency one-cycle control (CVFOCC) strategy based on dynamic capacitor ampere-second balance transient calculation (CASBTC)
Free QuoteIntroduction. Learn about variable capacitors, essential parts of many electronic devices.Adjustable capacitance makes these capacitors essential for fine-tuning electronic circuits electronic applications like radios and oscillators, their
Free QuoteCascaded H-bridge inverter (CHBI) with supercapacitors (SCs) and dc-dc stage shows significant promise for medium to high voltage energy storage applications. This paper investigates the voltage balance of capacitors within the CHBI, including both the dc-link capacitors and SCs. Balance control over the dc-link capacitor voltages is realized by the dc-dc stage in each
Free QuoteA Robust Capacitance Control Method for Variable Active Capacitor IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2024-05-27, DOI: 10.1109/tpel.2024.3405538
Free QuoteI built an efficient loop antenna for ham radio (see earlier project). I wanted to build my own variable capacitor with about 15 or 20 pF range for the loop that tolerates a 100 W transmitter. The
Free QuoteIn addition, the control algorithm of the MMC driven variable speed pumped storage system with charge channel is simple and easy to be realized. Therefore, the proposed low-frequency capacitor voltage fluctuation suppression method is promising for using in the variable speed pumped storage system.
Free QuoteOne of the most popular methods for speed control in the capacitor run SPIMs is the use of a variable resistance in series with the motor stator winding. However, this method is an inefficient speed control method owing to the power loss in the series resistance.
Free QuoteThis work presents a comprehensive study that focuses on the enhancement of power factor efficiency in industrial systems through the implementation of an intelligent capacitor bank control strategy.
Free QuoteThis paper presents a novel dc capacitor voltage balance control method for cascade multilevel static synchronous compensator (STATCOM) and a general analytical method for balance control strategy. Considering that the imbalance of dc capacitor voltage is caused by the inconsistency of active power absorbed and consumed by chain, a balance control
Free QuoteThis paper proposes a novel capacitance control method, which is able to configure the active capacitor with a specified capacitance value. It has the following advantages: 1) specific functions with capacitance value can be achieve; 2) power loss is reduced significantly with the light load; and 3) the dynamic response is improved during the
Free QuoteBased on this article, there are four methods to construct a variable capacitor. The most obvious approach would involve modeling it as a controlled voltage source and incorporating feedback
Free QuoteThis article proposes a capacitance control method for the variable active capacitor with improved accuracy and robustness. It applies an iterative learning controller to realize equivalent capacitances according to given reference values.
Based on this article, there are four methods to construct a variable capacitor. The most obvious approach would involve modeling it as a controlled voltage source and incorporating feedback to ensure the source aligns with the capacitor equation: So let's do that!
Definition: Whenever the capacitance of a capacitor is changed based on the necessity to a certain range of values is known as a variable capacitor. The two plates of this capacitor can be made with metals where one plate is fixed & the other one is movable.
It applies an iterative learning controller to realize equivalent capacitances according to given reference values. An 800-V/20-A active capacitor prototype is developed and tested under various dynamic operation conditions and circuit parameter shifts to verify the accuracy and robustness of capacitance control.
Now the variable capacitor is complete and is also wrapped in a subcircuit. You can load that subcircuit in a schematic by Navigating to “Subcircuit” and then “Load Subcircuit”. The mathematical expression that governs its operation is implemented using PSIM source and math blocks. To verify its operation the following circuit can be applied:
The var_capacitor subcircuit can be added to any PSIM schematic. The device can be also coupled with a lookup table in order to navigate between different real life capacitors from a vendor's list. Learn More: You can find out how to create a variable inductor here