Study of a low voltage reactive power dynamic compensation …
A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time requirement of reactive …
Detection of low voltage compensation capacitor
A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time requirement of reactive …
What is a low voltage capacitor?
A Low voltage capacitor or a voltage regulator is a small capacitor with a low capacity. It plays the role of a filter and if the capacitance of the capacitor increases, it filters out high-frequency noise, which results in a very high peak current and voltage. In most fans, these low voltage capacitors are used as speed controllers.
What is a low loss capacitor?
A low loss capacitor is a type of capacitor with total losses of less than 0.5 watts per kvar. This includes only the capacitor itself, not accessories such as power factor controllers and contactors, which have additional losses amounting to a total of less than 1.5 watts per kvar.
Is the proposed lpcmd feasible with Pvt-compensation technique?
To demonstrate the feasibility of the proposed LPCMD with the PVT-compensation technique, a second-order 2-bit quantization-based DSM is designed in 180 nm CMOS technology and the postlayout simulation is performed.
Does the tripping point of a common-mode detector vary with the Pvt condition?
However, the tripping point of the common-mode detector (CMD) varies with the PVT condition, which leads to the gain variation of the dynamic amplifier [ 7, 17, 31 ]. The linearity of the delta-sigma modulator (DSM) is sensitive to the gain variation of the dynamic amplifier.
How does lpcmd improve the robustness of a dynamic amplifier (da)?
By adopting the varying supply voltages to compensate the variation of the transistors’ threshold voltage, the proposed LPCMD improves the robustness of the dynamic amplifier (DA).
What is the output voltage variation of a transconductance amplifier?
As shown in Fig. 8, when the common-mode detector of the dynamic amplifier works, the output voltage variation of the regulator is about 5 mV, demonstrating the stability of the regulator. Schematic diagram of the operational transconductance amplifier in the proposed PVT-compensation technique
Capacitor Condition Monitoring for the Low-Capacitance StatCom: …
This letter presents a detailed analysis of the capacitor voltage oscillations and their dependence on the capacitance values. The analysis allows monitoring the condition of …
Capacitor voltage balancing, capacitance monitoring, and fast fault ...
This study has achieved methods for capacitor voltage balancing, capacitance monitoring, and fast fault detection based on the new configuration of voltage and current …
Low Drop-Out Voltage Regulators: Capacitor-less ...
Demand for system-on-chip solutions has increased the interest in low drop-out (LDO) voltage regulators which do not require a bulky off-chip capacitor to achieve stability, also called capacitor ...
A High-Accuracy Capacitor Condition Monitoring Scheme at Low …
Abstract: This article proposes a non-intrusive scheme for real-time monitoring of the dc-link capacitor condition in an ac/dc converter system under a low sample rate. The …
Active Damping Stability Control Method Based on Voltage Compensation ...
Aiming at the unstable phenomena such as high DC-link voltage ripple that occur in the interior permanent magnet synchronous motor drive system of the small DC-link capacitor when the rotor speed is high or the load power is large, this paper proposes an active damping control method based on voltage compensation. The method starts from the …
A High-Accuracy Capacitor Condition Monitoring Scheme at Low …
Abstract: This article proposes a non-intrusive scheme for real-time monitoring of the dc-link capacitor condition in an ac/dc converter system under a low sample rate. The method takes advantage of voltage fluctuations on the dc side resulting from changes in system load, without the need for additional hardware equipment or the injection of ...
A capacitor-free high PSR CMOS low dropout voltage regulator
This paper presents a capacitor-free CMOS low dropout voltage regulator which has high PSR performance and low chip area. Pole splitting and <i>g</i><sub>m</sub> boosting techniques are employed to achieve good stability. The capacitor-free chip LDO was fabricated in commercial 0.18 <i>μ</i>m CMOS technology provided by GSMC (Shanghai, China). …
A Low-Power Common-Mode Detector with PVT-Compensation
A low-power common-mode detector (LPCMD) with process, supply voltage and temperature (PVT)-compensation technique for the dynamic amplifier in delta-sigma modulator …
Fast bus voltage detection method for single-phase power …
Under dynamic conditions, the response time of traditional voltage detection methods is relatively lengthy, leading to overshoots in the DC-link voltage of single-phase power converters, which significantly degrades system performance. This study proposes a rapid voltage transient detection method based on reduced-order generalized integrator (ROGI) aimed at …
Compensation capacitor fault detection method in jointless …
The experimental results show that the detection effect of the capacitance fault detection method based on simulated annealing algorithm is accurate, and detection time is short, and the practicability is strong, compared with the genetic algorithm.
Capacitor voltage balancing, capacitance monitoring, and fast …
This study has achieved methods for capacitor voltage balancing, capacitance monitoring, and fast fault detection based on the new configuration of voltage and current sensors in an NNPC converter. The capacitor voltages are balanced using the output current sign and three proposed cases to estimate their voltage. Also, the proposed monitoring ...
Study of a low voltage reactive power dynamic compensation …
A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time requirement of reactive power dynamic compensation for capacitor switching, a signal generating circuit of voltage/current zero-crossing triggering switching is designed. A capacitor ...
Study of a low voltage reactive power dynamic compensation …
The proposed compensator uses the SPWM type inverter to regulate the voltage on the compensating capacitors and inductors directly, therefore can continuously control the compensator bi ...
Compensation Capacitor Status Monitoring Research Based on …
In order to meet the needs of railway electrical departments for "state repair" of track circuit compensation capacitors and timely and effective monitoring of compensation capacitor status, this paper proposes a new method that combines the feature quantities decomposed from CEEMD and LMD algorithms and utilizes support vector machines for ...
Buck converter with switched capacitor charge compensation for …
Switched capacitors can absorb charge from the load or release charge to the load to suppress voltage fluctuations and improve the transient response. A 12 V–0.9 V buck converter with a switched capacitor charge compensation auxiliary circuit is built and verified. Section 2 introduces the principle of switched capacitor charge compensation.
An online detection method for capacitor voltage transformer …
The physical mechanism of CVT ME is as follows: From Fig. 1, the high voltage U p on the primary side is divided into medium voltage by the CVD, and then the medium voltage is reduced into the low voltage output U s by the IVT. Since the high voltage U p is stepped down by the CVD, the insulation requirement for the IVT is reduced. The CVD is composed of hundreds …
Diagnosis Approach on Compensation Capacitor Fault of Jointless …
But there is little research on the fault diagnosis of compensation capacitor based on intelligent algorithm, although the genetic algorithm is proposed to realize the fault diagnosis and detection, the method has the shortcomings of low diagnostic accuracy, long time consuming and so on, that is to say, the diagnosis effect is not ideal.
Compensation capacitor fault detection method in jointless track ...
The experimental results show that the detection effect of the capacitance fault detection method based on simulated annealing algorithm is accurate, and detection time is short, and the …
Capacitor voltage change rate based fault localization strategy …
3.1 Analysis of fault characteristics under active operation. Open circuit faults can be separated into three categories. Case I, Case II, and Case III denote a failure in T 1, a failure in T 2, and simultaneous failures in T 1 and T 2, respectively.The fault features are shown in Table I where U smi, V cap_i, and S i represent the output voltage, the voltage of the …
Research on Fault Location Method of Track Circuit Compensation ...
in-depth research on the detection of compensation capacitors: In reference [1], aiming at the problems of low precision and long time of fault detection results of track circuit at present, simulated annealing algorithm was used to obtain the optimal value of compensation capacitor, and the parallel current amplitude envelope curve was drawn ...
[PDF] Compensation of Unbalanced Capacitor Voltage for Four …
DOI: 10.13067/JKIECS.2015.10.3.365 Corpus ID: 62242436; Compensation of Unbalanced Capacitor Voltage for Four-switch Three-phase Inverter Using DC Offset Current Injection @article{Park2015CompensationOU, title={Compensation of Unbalanced Capacitor Voltage for Four-switch Three-phase Inverter Using DC Offset Current Injection}, author={Young-Joo Park …
Output capacitor-free low-dropout regulator with fast transient ...
A output capacitor-free low-dropout regulator (LDO) with fast transient response and ultra-small compensation capacitor is proposed. The slew-rate enhancement (SRE) circuit based on dynamic biasing technique is designed to improve load transient response for …
Study of a low voltage reactive power dynamic compensation …
The proposed compensator uses the SPWM type inverter to regulate the voltage on the compensating capacitors and inductors directly, therefore can continuously control the …
Diagnosis and Ride Through of Single-Switch Open-Circuit Fault in Low …
Abstract: This article proposes novel single-switch open-circuit (OC) fault detection and fault-tolerant methods for the recently introduced low-capacitance cascaded H-bridge static synchronous compensator (LC-STATCOM). Considering the superiorities of the LC-STATCOM, it is an appropriate solution for reactive power compensation. In ...
Capacitor Condition Monitoring for the Low-Capacitance …
This letter presents a detailed analysis of the capacitor voltage oscillations and their dependence on the capacitance values. The analysis allows monitoring the condition of the capacitors using a closed-loop approach that feedbacks the error in voltage oscillations.
Compensation Capacitor Status Monitoring Research Based on …
In order to meet the needs of railway electrical departments for "state repair" of track circuit compensation capacitors and timely and effective monitoring of compensation …
A Low-Power Common-Mode Detector with PVT-Compensation …
A low-power common-mode detector (LPCMD) with process, supply voltage and temperature (PVT)-compensation technique for the dynamic amplifier in delta-sigma modulator (DSM) is proposed. By adopting the varying supply voltages to compensate the variation of the transistors'' threshold voltage, the proposed LPCMD improves the ...
Research on Fault Location Method of Track Circuit Compensation ...
in-depth research on the detection of compensation capacitors: In reference [1], aiming at the problems of low precision and long time of fault detection results of track circuit at present, …
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