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Voltage dependent current order limiter (VDCOL) can limit the HVDC current in low voltage and reduce the reactive power requirement, which helps power system quickly restore stability. Thus, the reasonable setting of VDCOL control parameters is vital to improve the recovery characteristics of system. This paper makes a deep research about VDCOL parameters setting method with considering reactive power...
This paper proposes a mathematical model of the three-phase four-switch pulse width modulated (PWM) voltage-source recti??er (VSR) based on direct power control (DPC). The derived model has the advantages of specific physical meaning, more versatile and precise, and most nonlinear control strategies of six-switch VSR could be utilized for four-switch VSR. By analyzing the proposed model, the dynamic...
With large centralized photovoltaic (PV) power stations connected to the grid, its effects on the distribution networks cannot be ignored. The mathematical model of a photovoltaic power station was built and the power outputs of this model with the changes of illumination were simulated. One photovoltaic power station and one reactive power compensation capacitor were accessed to IEEE 30-node network...
This paper describes a design of a multi-channel telemetry unit for monitoring distribution switching station based on TMS320F28016 DSP. It details the composition of the hardware block diagram and the design of software. It is capable of measuring multi-channel three-phase voltage and current. In the software, it adopts Fast Fourier Transform to compute multi-channel three-phase voltage, current,...
The paper presents a hybrid power filter for suppressing harmonics caused by the nonlinear load in drilling rig electric power system, and analyzes the impact and the harm of the harmonic. The principle and the control method of system are discussed. A composite control model is adopted. The experimental results show that the hybrid power filter has the good characters of harmonics elimination and...
To ensure the safety of pipeline in the laying process, a tensioner system for a pipelaying vessel was designed to realize the constant control to pipeline. The tensioner uses two tracks to clamping pipeline, hydraulic system to drive upper track, AC servo motor to send the pipeline into the sea. In this design, as the critical component of the tensioner, track shoe was designed; furthermore its strength...
Energy saving is a crucial factor in industry. This paper discusses the energy saving of the tension system of a tensioner for a vessel. The tension system includes the hydraulic pressure clamping system and the AC servo motor. According to analysis, in the hydraulic pressure system the main energy consumption factor is the power source. So we have chosen the A7V.80.EL which is a kind of high-efficiency,...
Architecture design and software implementation both contribute to the correctness of ultimate software products. So performance testing is very helpful to test the inconsistence between design and implementation since it is the mix reflection of both sides. Especially in embedded system, with limited resources, execution time is more likely to expose hidden defects. This research presents a time...
In this paper, the cause and its serious hazard of the inter-turn short circuit fault on turbine generator rotor windings are analyzed. Furthermore the electromagnetic characteristics and mechanical characteristics as well as the correlative variety of the electrical parameters induced after inter-turn short circuit fault on turbine generator rotor windings are analyzed. Based on the fault characteristics...
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