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As HVDC based on voltage source converter (VSC) technology has already reached 350 kVdc voltage level, this paper examines the feasibility of connecting four voltage source converter (VSC) modules, each rated at 200 kVdc, in series to form a pole of UHVDC rated at 800 kVdc. Due to the series connection layouts, the individual DC bus voltage inequality exists when power reversal occurs. A detailed...
This paper presents a smart DC network formed by a multi-terminal VSC-HVDC connecting various micro-grids, independent power generation stations, and passive loads. The corresponding deadbeat current control scheme based on coordinated strategy for multi-terminal VSC-HVDC systems is proposed. The current control scheme is easy to design, implement and has good dynamic response. the case of four-terminal...
Firstly, in this paper we briefly review the control schemes for the VSC-HVDC system. Then, present conventional PI decoupling control, hysteresis current control and deadbeat current control schemes for the VSC-HVDC transmission system connecting two AC grids. Furthermore, compare their advantages and disadvantages in the VSC-HVDC control systems. Finally, Case of two-terminal VSC-HVDC system is...
This paper presents the design, analysis, and sensorless control of a new self-decelerating permanent-magnet (PM) machine based on magnetic-gear. The key is to integrate the magnetic gear with the PM machine while removing the gear inner rotor. Hence, the proposed motor can achieve the low speed high torque output and high speed compact design requirements as well as high torque density with a simple...
In this paper, a novel brushless machine with 12-stator-slot/8-rotor-pole having magnets surface-mounted in the stator instead of rotor is proposed, which can be regarded as an improved flux-reversal permanent magnet (FRPM) machine and is especially suitable for brushless DC operation. The topology, operation principle and static characteristics of the proposed three-phase 12/8 stator surface-mounted...
In this paper, a double-loop control scheme is proposed for the VSC-HVDC transmission system connecting two AC grids. A conventional PI controller is used in the outer loop and a current deadbeat controller is presented in the inner loop in order to achieve fast dynamic response, high tracking accuracy and robustness. Cases of two-terminal VSC-HVDC system are developed in MATLAB/SimPowerSystems to...
Flux-switching and doubly-salient brushless motors are both novel PM machines having magnets in the stator instead of rotor with outstandingly different static characteristics, especially on the PM flux-linkage waveform, namely, the unipolar and quasi-trapezoidal one for the doubly-salient PM motor, whereas bipolar and sinusoidal one for the flux-switching PM motor, which inevitably results in the...
In this paper, stator-flux orientation control strategy for the flux-switching permanent magnet (FSPM) motor under two pulse width modulation (PWM) generation modes, namely current hysteresis and voltage space vector, is investigated and implemented. Firstly, the definition of d- and q-axes for the FSPM motor, which is crucial to the mathematic model and control strategy, is highlighted. The fundamental...
Pitch angle control is the most common means for adjusting the aerodynamic torque of the wind turbine when wind speed is above rated speed and various controlling variables may be chosen, such as wind speed, generator speed and generator power. As conventional pitch control usually use PI controller, the mathematical model of the system should be known well. A fuzzy logic pitch angle controller is...
This paper investigates feasible topologies of VSC-HVDC system for interconnecting large-scale off-shore wind farms. The corresponding control strategy is developed for coordination and control of the corresponding VSC-HVDC systems. A case of 5-terminal VSC-HVDC system is developed in MATLAB/ SIMULINK to demonstrate the validity of the proposed scheme. The proposed scheme may enable optimal integration...
In this paper a predictive control scheme is proposed for the VSC-HVDC system to achieve decoupled control of active and reactive power. The proposed control scheme, which is of simple structure, offers high tracking accuracy, fast dynamic response and good robustness. A case of two-terminal three-level VSC-HVDC system is developed in MATLAB/SIMULINK to verify the validity of the proposed control...
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