Distributed Control of Compensation Devices for Enhancing Stability of Long-distance AC Transmission System

Compared with AC (alternating current) transmission, DC(direct current) transmission has obvious superiority at high power, long distance, submarine cable transmission and asynchronous interconnected between exchange systems etc.. This paper constructed a kind of 12 pulse bridge UHV DC transmission system that includes control protection function through MATLAB/Simulink tool. By setting the breaker parameters, this paper studied the 12 pulse bridge UHV DC transmission system AC/DC side in case of setting down time, type and cleared. The simulation results demonstrate that this system has a good effect in harmonic control and it has no power compensations in realizing HV DC process, and it can completely work as an important reference in constructing HV DC power grid.

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Anti–Drag Braking Control Technology for Electric Drive Dump Truc

Electrotehnica, Electronica, Automatica ◽

10.46904/eea.21.69.1.1108004 ◽

2021 ◽

Vol 69 (1) ◽

pp. 30-36

Author(s):

Hu Xingzhi

Keyword(s):

Control System ◽

Power Transmission ◽

Reverse Flow ◽

Transmission System ◽

Rotating Magnetic Field ◽

Phase Method ◽

Power Calculation ◽

Zero Crossing ◽

Speed Sensor ◽

Ac Transmission

The power transmission system of electric wheel vehicle with "Power generator - diode rectifier - inverter - traction motor" can achieve part of the braking energy recycling and reduce fuel consumption through the reverse flow of energy in the downhill braking conditions. For AC - DC - AC transmission system of electric wheel vehicles. In order to achieve the engine anti-drag starting smoothly through the introduction of the theory of Engine Anti - drag Braking and the observation of the rotor frequency by external speed sensor, in addition to that zero-crossing detection phase method to achieve the stator rotating magnetic field and rotor speed synchronization purposes. Through use the rectifier inverter module to achieve energy bi-directional transmission and to achieve engine anti-drag when the vehicle goes downhill slowly. In the article, design of engine brake anti-drag control system and the establishment of anti-drag brake power calculation mathematical model, also build the anti-drag test platform of the engine to verify the control system. The experimental results show that the proposed control scheme for the start of the inverter is simple and reliable, which provides the theoretical basis and experimental data for the actual vehicle design.

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Voltage Swell Mitigation Using Flexible AC Transmission Systems Based on Evolutionary Computing Methods

International Journal of System Dynamics Applications ◽

10.4018/ijsda.2014070104 ◽

2014 ◽

Vol 3 (3) ◽

pp. 73-95 ◽

Cited By ~ 1

Author(s):

Marwa Shahin ◽

Ebtisam Saied ◽

M.A. Moustafa Hassan ◽

Fahmy Bendary

Keyword(s):

Particle Swarm Optimization ◽

Steady State ◽

Computing Methods ◽

Transmission System ◽

Swarm Optimization ◽

Flexible Ac Transmission ◽

Flexible Ac Transmission System ◽

Voltage Swell ◽

Ac Transmission ◽

Bus System

The main subject of these paper deals with enhancing the steady-state and dynamics performance of the power grids by using new idea namely Advanced Flexible AC Transmission Systems based on Evolutionary Computing Methods. Control of the electric power system can be achieved by using the new trends as Particle Swarm Optimization applied to this subject to enhance the characteristics of controller performance. This paper studies and analyzes Advanced Flexible AC Transmission System to mitigate only one of power quality problems is voltage swell. The Advanced Flexible AC Transmission System, which will be used in this paper, is the most promising one, which known as Advanced Thyristor Controlled Series Reactors, and Advanced Static VAR Compensator were utilized in this research to mitigate the voltage swell aiming to reach. This paper focuses on the operation of the AFACTS device under turning off heavy load that may causes transformer damaged, as no research covers this problem by this technique. Particle Swarm Optimization is used to determine the value of series inductor connected to the Advanced Flexible AC Transmission System. The proposed algorithm formatting, deriving, coding and programming the network equations required to link AFACTS during steady-state and dynamic behaviors to the power systems tested on the IEEE 30 bus system as well as IEEE 14 bus system, and 9 bus system.

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