US20130286692A1
US20130286692A1 US13/570,781 US201213570781A US2013286692A1 US 20130286692 A1 US20130286692 A1 US 20130286692A1 US 201213570781 A US201213570781 A US 201213570781A US 2013286692 A
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Capacitor Filter Detection Method EMS
Multi‐criteria protection scheme for online element failure detection
element failure detection in shunt capacitor banks ISSN 1751-8687 Received on 24th February 2020 Revised 2nd June 2020 Accepted on 16th June 2020 capacitor. The presented method, which is applied for each phase separately, utilises only the available voltages of the unbalance
Filter circuits
Capacitor Filter Capacitor Filter. In this filter a capacitor is connected across the load during the rise of the voltage cycle it gets charged and this charge is supplied to the load during the
FFT-based selective harmonic current control of AC filter capacitors
frequency-domain methods. Time-domain harmonic detection methods are based on the instantaneous reactive power theory, such as p-q method6,7 and d-q method.8,9 In addition to the instan-taneous reactive power, the filter algorithms have to be used to separate the fundamental and harmonic com-ponents, such as Adaptive notch filter (ANF)10 or
(PDF) Failure detection of the capacitor bank of the
In , a capacitor failure detection method was proposed for a threephase diode rectifier. The method is based on the analysis of the 6 th harmonic component of the dc-bus voltage to detect the
Short-Circuit Fault Detection and Isolation Using Filter Capacitor
A fault detection method for a photovoltaic-based low-voltage dc microgrid (LV-DCMG) system is presented and the key advantages are fast fault isolation, communication
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This study proposes a rapid voltage transient detection method based on reduced-order generalized integrator (ROGI) aimed at improving the response speed of bus voltage peak detection. It consists of a single-phase rectifier, an APDC, and a resistive load. The APDC consists of a half-bridge, a filter inductor L f, and a split capacitor
Fast plug-in capacitors polarity detection with morphology and
Lin et al. [] proposed a method for detecting the existence of capacitors on PCB using the YOLO algorithm.The recognition time of a single component can be as long as 294 milliseconds (219–710ms). Susa et al. [] proposed a method to detect the capacitor on the circuit board using YOLO V3. with the accuracy of (93.33%).Fan et al. [] proposed a three-stage
On-line Failure Detection Method of DC Output Filter Capacitor
This objective of this paper is to propose a new method to detect the rise of equivalent series resistor(ESR) in order to realize the online failure prediction of electrolytic capacitor for DC output filter of power converter. The ESR of electrolytic capacitor estimated from RMS result of filtered waveform(BPF) of the ripple capacitor voltage
Short-Circuit Fault Detection and Isolation Using Filter Capacitor
A method was presented to utilize the current dynamics of the filter capacitor in the detection of faults . The cost of the protection unit is reduced by utilizing a minimum number of fault
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Self-detection method for measurement error of
China and State Grid Anhui Electric Power Company Electric Power Research Institute
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Capacitor Aging Detection in a DC-DC Converter Output Stage
There are three various types of power capacitors widely used in power conditioners, namely Aluminum Electrolytic Capacitors (Al-Caps), Metallized Polypropylene Film Capacitors (MPPF-Caps) and
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Power conversion systems and methods are presented for detecting input filter capacitor degradation or approach of end of operational life based on filter capacitor current measurements...
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The invention discloses a method for detecting failure of a filter capacitor of an inverter, which comprises the following steps when the midpoint of a direct current bus is connected with...
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Signal acquisition and processing method for capacitive
The rotating capacitor filter is a signal processing method based on the phase-sensitive detection technology. It can extract the weak signal from the strong and wide-band
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Power conversion systems and methods are presented for detecting input filter capacitor degradation or approach of end of operational life based on filter capacitor current measurements using single and/or dual threshold comparisons for computed instantaneous sum of squares of filter currents or power values. CN103378741A - Filter capacitor
A novel method for electric vehicle insulation detection based on
To address the aforementioned issues, Ref. proposed a detection method that combines the LFI method with the variable forgetting factor least squares (VFFRLS) algorithm. This approach involves developing a model for the reflected wave voltage in injection detection. The model''s parameters are identified using the VFFRLS algorithm, effectively
DC-DC Buck Converters with Quasi-Online Estimation of Filter Capacitor
The article focuses on devising solutions for monitoring the condition of the filter capacitors of DC-DC converters. The article introduces two novel DC-DC buck converter designs that monitor the equivalent series resistance (ESR) and the capacitance of capacitors using a parameter observer (PO) and simple variable electrical networks (VEN). For the first
ELECTROLYTIC CAPACITOR ONLINE FAILURE DETECTION AND
detection methods can be classified into two sections, online and offline failure prediction methods. Most of the methods use power converters for their application. A ratio of the capacitor voltage to the capacitor current or load current method has been widely used with converters -. Some method consider current as constant source
Filter Capacitor Current Dynamics-Based Frequency-Domain Fault
In this article, we propose a cost-effective short-circuit fault detection method for a distribution network in the ac grid-connected low-voltage dc (LVdc) microgrid. In this method, a typical dc
Online Detection Method for Capacitor Voltage Transformer
A robust detection and diagnosis method for incipient faults under the principal component analysis that can detect all incipient sensor faults in traction systems of high-speed trains in real time by comparing reference probability density functions (PDFs) with the online estimated PDFs.
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Therefore we prepare this article to analyze LPC55xx power supply circuit and introduce detection method. 2. A set of filter capacitors: To filter out the burrs and glitch at the voltage input. 3) DCDC circuit: Work with LPC55xx internal
HARMONIC DETECTION WITH NOTCH FILTER USING
Precision of harmonic detection is one of the most important factors of active power filters. This paper describes a harmonic detection method to extract harmonic components in a distorted signal. Experimental results verify its
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This paper proposes a new grid impedance detection method incorporating the complex coefficient filter (CCF) with full-order capacitor current observer for a T-type three-level grid-connected
Grid Impedance Detection Based On Complex Coefficient Filter
This article proposes a new grid impedance detection method incorporating the complex coefficient filter (CCF) with full-order capacitor current observer for a T-type three-level grid-connected inverter controlled by the inverter output current feedback. Compared with conventional CCF impedance detection algorithms, the proposed method reduces the number of current
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Short-Circuit Fault Detection and Isolation Using Filter Capacitor
An LV-DCMG system is considered for building the application to realize the proposed fault detection scheme. Active sources such as solar photovoltaic and battery are connected to the passive loads through a dc-dc converter, dc cable, and solid-state relays. The proposed method considers an average of the capacitor current as a detection parameter.
Filter Capacitor Current Dynamics-Based Frequency Domain Fault
The proposed method considers an average of the capacitor current as a detection parameter. An iteration-based isolation configuration is also suggested for a zonal type of distributed network.
Design of Switched-Capacitor Filters | SpringerLink
In the early years of the emerging new discipline of switched-capacitor (SC) filters, a large number of design methods for SC filters were suggested. These methods can be divided into the following four groups: (i) derivation from active-RC filters, (ii) derivation...
Online capacitor early ageing monitoring and detection using a
comparison, the proposed method has some merits compared with the other methods like simplicity, accuracy, cost-efficiency and applicability for different DC–DC converters. In the rest, Section 2 is assigned to presentation of the proposed online capacitor ageing monitoring algorithm in more detail. The
A Review of Harmonic Detection, Suppression,
Several methods of harmonic suppression can be used, including passive filters, active filters, and harmonic traps. Passive filters are the most common method, and inductors and capacitors are used to filter out
FFT-based selective harmonic current control of AC filter capacitors
based harmonic current control method is proposed for audible noise analysis of AC filter capacitor. Firstly, mathemati- Harmonic detection, AC filter capacitors, current control, FFTalgorithm
Partial Discharge Measurement Coupling Methods
Coupling Capacitors A coupling capacitor (C C) is a very common coupling method when performing a PD measurement as described in the IEC 60270 standard. When a partial discharge event occurs, the coupling capacitor provides the devices under test (DUT) with a displacement current, which is measurable at the coupling devices (CPL).
(PDF) Capacitor aging detection for the DC filters in
A few methods have been recently proposed to externally inject a signal for the C or ESR estimation under various applications, which requires special operation of the
6 Frequently Asked Questions about “Capacitor filter detection method”
Can a rotating capacitor filter extract weak signals from strong interference noise?
Although the rotating capacitor filter can extract weak signals from the strong interference noise, its performance is also limited in some cases. For example, when the frequency of the noise is the same with the useful signal, the rotating capacitor filter will not work properly.
What are the characteristics of a rotating capacitor filter?
According to the characteristics of the wide noise frequency distribution, the frequency-selective filtering characteristics of the rotating capacitor filter are used to extract the induction signal with the same frequency as the excitation signal to obtain a more ideal flow signal.
What is amplitude frequency response of rotating capacitor filter?
Fig. 6. Amplitude frequency response of rotating capacitor filter. It performs narrow-band filtering on the component of the input signal with the frequency f0 and its odd harmonics, while suppressing the noise at other frequencies.
Why does a rotating capacitor filter not work?
The frequency is the same as the excitation frequency, so the rotating capacitor filter cannot effectively filter it out and output it as an effective flow signal. 2) The noise spectrum is wide and the passband of the comb filter centered on odd harmonic frequencies of the excite signal is not narrow enough.
What measures should be adopted in a magnetic field detection circuit?
For the first case, the following measures should be adopted, such as, reliable shielding of detection electrodes, transmission wires, and signal acquisition circuits, so that the signal wires are completely parallel with the magnetic field line to keep the magnetic flux through the circuit loop as low as possible.
How can a detection circuit improve the input impedance of an amplifier?
The circuit can eliminate the influence of distributed capacitance on the input impedance of the operational amplifier, and greatly improve the input impedance of the detection circuit to overcome the disadvantage of high signal source impedance.