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Lin Xu
Sichuan Electric Power Research Institute

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 1 
Study on Control Strategies for the Multilevel Cascaded Converters Lin Xu; Yang Han
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 11: November 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The multilevel cascaded converters are extensively applied for high-voltage and high-power applications, which are considered as the most favorable topologies for the high power ac-drives and the high-voltage DC transmission (HVDC) systems using the voltage source converters (VSCs). This paper presents the dc capacitor balancing and effective current regulation methodologies for the multilevel cascaded converters. The dc-link voltage balancing and capacitor energy evolving mechanism of the MMCC is analyzed, and an effective control scheme is devised by utilizing two dc capacitor voltage control loops, including the total capacitor voltage controller (TCVC), the capacitor voltage balancing controller (CVBC). The predictive current controller is proposed to enhance the tracking accuracy of current control loop. The proportional-resonant controller (PRC) is used as circulating current damping controller of the modular multilevel converter, which is found to be highly effective to minimize the circulating current. The Electromagnetic Transient Program (EMTP) is utilized for digital simulation of the single-phase five-level modular multilevel converter. The effectiveness of the control scheme is validated by the simulation results. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2994
Research on the AVC Testing Platform for the Regional Grid based on Real-Time Digital Simulator (RTDS) Lin Xu; Yang Han
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 1: January 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The automatic voltage control (AVC) relay provides real-time automatic control for the on-load transformer tap changer (OLTC), which is widely used for power system voltage monitoring and control purposes throughout the world. However, there are no uniform testing standards for the AVC system, and the lack of on-site inspection means has stimulated the introduction of the real-time digital simulator (RTDS)-based testing platform. This paper introduces the testing platform of the AVC controller based on the RTDS. The circuit model of the regional power grid is established, and the OLTC and the reactive power compensation devices are also incorporated. The intermediate data conversion device is utilized for bi-directional data exchange of the remote meter and control signals between the RTDS and the AVC system. The principle of the AVC voltage regulation and the RTDS-based AVC testing platform are introduced, followed by the data flow of the OLTC and capacitor/inductor banks, which formulates the foundation for closed-loop testing of the AVC control system for the electric power system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1677
Evaluation of the Reference Current Generation Methods for Harmonic Compensation Applications using Instantaneous Reactive Power Theory (IRPT) Lin Xu; Yang Han
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 1: January 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents a critical survey of the reference current generation (RCG) methods for harmonic and reactive power compensation for the electrical distribution systems. A critical review of the p-q method, the d-q(id-iq) method, the p-q-r method, the UPF method and the FBD method are presented for the sake of comparison. In order to mitigate the deficiencies of these existing methods, the modified d-q method, the modified p-q-r method, and the modified p-q method are also presented. The MATLAB simulation of these algorithms is carried out for different grid voltage and load conditions scenarios. It is found that, all these algorithms show similar performance in case of ideal grid voltage scenario. In case of grid voltage unbalance or harmonics, the difference in steady state compensation accuracy among these algorithms is presented. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1675
Study on Practical Issues for the State Estimation of the Automatic Voltage Control (AVC) System Lin Xu
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 3: March 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The state estimation is an important part of the automatic voltage control (AVC) system, and it is the basis of the advanced software application for the electric power systems (EPSs). This paper presents the status quo of the current state estimation mathematical model and the actual grid state estimation applications. The actual AVC system network modeling and model validation, pre-processing and other related issues are discussed, and the methods for detection and identification of bad data are presented. Besides, the debugging method of state estimation for enhancing practical pass-rate is proposed. Finally, the state estimation of the actual system is validated, and the results show that the state pass-rate is more than 99%, which has important significance for the AVC control practitioners and power flow dispatchers.DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2256
Coordinated Control of SVC and PSS for Transient Stability Enhancement of Multi-Machine Power System Lin Xu
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 2: February 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The coordinated control for SVC and generic/multi-band PSS for power swing damping is presented for the multimachine power system. The background and the mathematical models of the generic PSS, the multi-band PSS and the SVC are presented. The V-I characteristics as well as the dynamic properties of the static var compensator (SVC) are presented. The multi-machine power system is simulated using MATLAB and the effect of PSS and SVC on dynamic response of the system under single-phase fault and three-phase fault are simulated. The simulation results reveal that the coordinated control of the SVC and the generic/multi-band PSS is an effective solution to damp low frequency oscillation for multimachine power system and enhance global stability of the large inter-connected power system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1756
Co-Authors Yang Han