Global Organization
A novel series capacitor voltage balancing strategy was proposed to use in modular matrix-converter-based smart transformers, which are suited for the high voltage scenarios and or multiple ports. The capacitor voltage balance strategy considering the capacitance difference. The conclusions are made as follows:
The discharge of capacitor banks at substations is necessary before their connection to the grid can occur. This study investigates the use of delta-connected transformers for capacitor discharge. The energy from the capacitor banks is discharged by driving the transformers into saturation after disconnection from the grid.
This paper has shown the relationship between transformer size, discharge resistor size and the discharge time of the capacitor banks. The optimal results for the capacitor bank and transformer combination have been listed, with a variety of economical and effective solutions produced.
A capacitor voltage balancing strategy with n -capacitors in series should be devised. It should develop from the balancing strategy of two capacitors in series. The influence of the switching sequence should be investigated also. Lijun Zhang: Writing – original draft, Writing – review & editing, Conceptualization, Methodology, Validation.
The results obtained also show that using very small transformers of ∼0.001 MVA will result in very fast discharge of the 10 MVAR capacitor bank. The results are also constant for different values of the discharge resistor.
By adding an offset in the carrier wave, the proposed capacitor voltage balance strategy can balance the input capacitor voltage which is beneficial for the high-frequency transformer. The small signal model is established and the results show that the balancing strategy will not affect the stability.
We introduced the transformer effective bias current to describe the effect of the grounding current in the transformers after considering the wiring characteristic of auto …
Abstract: An intelligent power capacitor with synchronous switching is designed, which can quickly switch on and off the reactive compensation capacitor. By accurately calculating the time of …
In this study, we propose a new LCCT-qISI (Inductor–Capacitor–Capacitor–Trans quasi-Impedance Source Inverter) with the …
A fuzzy neural network algorithm is used to solve the problem of voltage and reactive power integrated control in a substation. A genetics algorithm is used to find the best …
Capacitor units are connected in paralleled-series combinations and form a single-phase capacitor bank, within a steel enclosure. The series combination reduces the …
The first stage of this paper involved the investigation of a simulation model of a substation capacitor bank created in PSCAD. As seen in Fig. 1, the model represented a three-phase wye connected capacitor bank …
A new method of direct energy balancing topology is developed in this paper. By using a transformer to convey energy under four operational cases, it is possible to directly …
Series-connected Matrix-converter-based smart transformers (MCSTs) with capacitive voltage dividing networks are promising topologies owing to improvements in terms …
This paper presents a simple method for the fast discharge of capacitor banks using delta-connected transformers. This paper has shown the relationship between transformer size, discharge resistor size and the …
Capacitor voltage transformer (CVT) is one of the most important instrument transformers widely used to prepare the voltage signal for control and protection equipment. …
The step-up transformer can raise the low voltage to the rated voltage of EUT, and the standard capacitor is used as the comparison object for EUT output measurement. A field picture of …
This article deals with the modeling and control of a solid-state transformer (SST) based on a dual active bridge (DAB) and modular multilevel converter (MMC) for …
Tininal proposes a tabular graphic method for calculating saturation time, which allows the process of optimizing the selection of current transformers and RP devices …
So it is necessary to optimise the configuration of the capacitance isolation device. For the autotransformer, there is a direct connection between the series windings. It is …
This paper presents a simple method for the fast discharge of capacitor banks using delta-connected transformers. This paper has shown the relationship between …
China and State Grid Anhui Electric Power Company Electric Power Research Institute
In an open delta or V-V delta transformer connection, three single-phase transformers are connected in a delta fashion but with the third leg open or incomplete. This …
Abstract: The integration of inductor (L), capacitor (C) and transformer (T) to one L-C-T element is one key technology for future power supplies. The four-pole configuration presented here is an …
Capacitor voltage transformer (CVT) is an important part of electric energy metering device. If the fault can not be located in time and repaired, it will cause serious consequences. At present, it …
The discharge of capacitor banks at substations is necessary before their connection to the grid can occur. This study investigates the use of delta-connected …
In this study, we propose a new LCCT-qISI (Inductor–Capacitor–Capacitor–Trans quasi-Impedance Source Inverter) with the …