An AC-DC-AC topology based on multi-converter is proposed in this paper. It can match the capacity of converter for high voltage and large power applications. This structure not only suitable solving quality problems electrified railways, but also has its own superiorities. Its architecture advantages traction application are analyzed depth, design calculation main elements presented. The control system designed, where dc current feedforward adopted to relieve impact load mutation system....

As high-speed railways develop rapidly worldwide, the problems of neutral section and power quality are becoming increasingly prominent. These affect normal operation grid electric locomotives. The co-phase supply schemes were proposed by researchers, which can solve these well. Among them, MMC-based scheme (MMC-5 L) is a representative one. existing scheme, when applied to auto-transformer (AT)-fed system usually adopted railways, needs install an on output side. To eliminate obtain more...

The existing problems of the traction power-supply system (i.e., existence neutral section and power quality problems) limit development railways, especially high-speed which are developing rapidly worldwide. leads to speed loss as well mechanical failures, all threaten fast safe operation train system. Meanwhile, (e.g., negative sequence current, reactive power, harmonic) can bring a series that cannot be ignored on three-phase grid side. In response, many researchers have proposed co-phase...

The arc furnace is a common load in smelting industry. Due to special structure, it often generates great impact on the grid. It has become recognized technical means use dynamic reactive compensation device SVC eliminate adverse impacts grid power quality during production. However, electrical system of some containing sites complex. Limited by site condition which sound commissioning environment cannot be provided for SVC, relevant control parameters can only configured basis experience,...

In recent years, 66kV vertical TCR-type SVC was put into operation in several transformer substations at home. Compared to the compensation mode of conventional 35kV which is connected busbar through by way step-down transformer, has advantages low loss and small maintenance amount. However, it found that damage phase controlled reactor TCR happens scenes, technicians research institutions studied this problem from such aspects as manufacturing process, control strategy natural environment...

Recently, with the increasing strength of attracting business and investments in Liaoning coastal area or big cities’ suburbs (counties), a large number industrial mining enterprises have shifted to rural areas. The areas’ power load is growing rapidly, but at same time, many sites such as 66kv substation, 10kv transmission line, low-voltage distribution occurred different levels “low voltage”, which affect daily life production native residents. From 2011, Electric Power Co., Ltd. has...

The dry hollow reactor has the features of good inductance linearity and heat dissipation is not easy to produce ferromagnetic resonance with capacitive load in system. Therefore, phase controlled TCR-type SVC usually a reactor. According years’ actual operating condition, 35kV or at lower level operates stably while tree discharge breakdown failure frequently happens 66kV vertical SVC, which seriously affects stable operation equipment. This paper puts forward method installing arrester on...

In order to solve the problem of low voltage at a terminal rural power grid 66kV substation, 5000-kilovar SVG is arranged in substation elevate and stabilize 10kV bus voltage. Since put into operation, runs well, solving while lowering loss entire line. However, some cases, people find that stabilizing voltage, causes drop adjacent act intelligent capacitor unit thus leading opposite reactive response SVG, affecting stabilization two substations adding up equipment loss. This paper analyzes...

Before commissioning, SVG first requires a separated excitation process: network voltage charges the capacitor on DC side in each H-bridge power module via starting resistor (IGBT all modules shall lock impulse). After charging, has enough for dynamic var compensation of system. This paper introduces fundamental functions SVG, analyzes influence selection safe operation device, raises principle and conducts simulation verification by using PSCAD.

Nowadays, the information revolution with digital technology as core is taking place in engineering consulting industry. Traditional enterprises should follow trend and change trend, give full play to their long-accumulated knowledge skills, realize platform-based transformation. Combining existing literature research, this paper proposes transformation of Chinese traditional based on dynamic embedding value chain, verify it platform practice Glodon Company. Taking environmental perception...