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This paper proposes an improved stator flux control algorithm based on the torque feedforward control technique for interior permanent magnet synchronous motor (IPMSM). The proposed flux linkage control algorithm can prevent the d and q- axis voltages from saturation and improve the dynamic behavior. A lookup table is used in the torque feedforward control technique, which outputs the desired d and...
With the increasing integration into power grids, wind power plants play an important role in the power system. Many requirements for the wind power plants have been proposed in the grid codes. According to these grid codes, wind power plants should have the ability to perform voltage control and reactive power compensation at the point of common coupling (PCC). Besides the shunt flexible alternating...
This paper introduces the structure and operational mechanism of Modular Multilevel Converter-High Voltage Direct Current (MMC-HVDC) and the mathematical model for the MMC-HVDC system in d-q synchronous reference frame is developed. When supplying power to passive networks, the MMC-HVDC controller at the passive network side, which contains a novel inner fast current loop and an outer voltage loop,...
As a common tendency, large-scale wind farms are increasingly connected to the transmission system of modern power grids. This introduces some new challenges to the connected power systems, and the transmission system operators (TSOs) have to put some new requirements as part of the grid codes on the integration of wind farms. One common requirement to wind farms is the function of system voltage...
This paper presents a graphical explanation on the damping torque analysis (DTA) method. The explanation is established based on small-signal equal-area criterion of power system stability analysis. From the graphical explanation, a generalized approach for the analysis of damping effectiveness of power system control is proposed. An example is given in the paper to demonstrate how the generalized...
This paper describes a fixed maximum power point analog control used in a step-down pulse width modulated power converter. The DC/DC converter drives a DC motor used in small water pumping installations, without any electric storage device. The power supply is provided by PV panels working around their maximum power point, with a fixed operating voltage value. The control circuit implementation is...
The authors present the results of feasibility study of a novel concept of power system online collaborative voltage stability control. Online collaboration between power system controllers is proposed in order to enhance their overall performance and efficiency to cope with the increasing operational uncertainty of modern power systems. The framework of the proposed online collaborative voltage stability...
Unified power flow controller (UPFC) is of multiple control functions to regulate AC voltage, active power and reactive power flow. Research has found that existence of dynamic interactions among those multiple control functions may result in poor control performance and even closed-loop system instability. This paper investigates the UPFC's controllable parameter region with variations of UPFC control...
This paper proposes the concept of power system post-emergency voltage control (PEVC) as a measure to defend important area in a power system against voltage collapse based on a framework of the third-category control and multi-agents system. The main feature of PEVC is to launch functions in real time according to unexpected power system events via information exchange. Both the dynamic co-ordination...
Unlike conventional power system, the system voltage and frequency of some renewable energy resources based stand-alone distribution generation (DG) system maybe controlled by power electronics converters. This paper presents the control of parallel operation multi-converters in a DG system. The investigated stand-alone DG system is constructed by two local DG subsystems; in each of them, two power...
Unlike conventional power system, the system voltage and frequency of some renewable energy resources based stand-alone distribution generation (DG) system maybe controlled by power electronics converters. This paper presents the control of parallel operation multi-converters in a DG system. The investigated stand-alone DG system is constructed by two local DG subsystems; in each of them, two power...
A large number of distributed generation (DG) units are being integrated into power systems at distribution level. The DG units play an essential role in affecting the efficiency and performance of power systems. This paper describes some possible controlling modes of DG units. The operation and control of the power systems consisting of DG units, in particular separated subsystems, are discussed...
The paper discusses a bidirectional DC/DC converter for interfacing an energy storage device in an autonomous power system, which consists of wind turbines and diesel generation units. The operation condition variations, such as switching load, could cause significant dynamics in an autonomous system. An energy storage device can effectively increase the utilization of the renewable energy and improve...
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