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Recently, the electromagnetic and electromechanical hybrid simulation is gradually practiced to engineering in analysis of large AC/HVDC power systems. Interface models are one of the most important interface techniques determining accuracy and applicability. Nevertheless, the limitations of traditional interface models emerge and become concrete. This paper develops interface computational equivalent...
Most converter-based power conditioner schemes for traction substation so far contain a pair of costly and bulky step-up transformers. A transformerless compensator is proposed in this paper to balance the loads of traction supply arms. This novel compensator employs a neutral-point-clamped three-level three-leg converter based on series connected IGBTs. Dynamic voltage balance of IGBTs is carried...
Series connection of IGBTs is applied to increase the voltage rating of converters. The critical issue is to balance the dynamic voltage of each device in the series string. This paper investigates an auxiliary circuit as a solution involving slope regulating and voltage clamping. It adjusts the Miller capacitance and gate current with additional capacitors and feedback current from collector to gate,...
For power system simulation, the contradiction between the computational efficiency and the system scale as well as the detailed modeling comes into being. The electromagnetic/electromechanical hybrid simulation technology has been thereupon proposed. In this paper, a novel real-time hybrid simulator, which is based on two personal computers (PCs) and an analog communication device for data exchange...
Impact loads require STATCOM to have fast and robust performances. Based on the analysis of mathematic model, a decoupling control method of STATCOM is investigated in this paper. This method is implemented in two industrial STATCOMs and presents satisfied control capabilities. The compensated PCCs of impact loads obtain significant improvements of power quality.
Wide-area measurement system (WAMS), based on technology of synchronized phase measurement, can precisely measure real-time dynamic information of power network. It will provide new methods that achieve real-time control, stability enhancement and transfer capacity improvement in power network. WAMS constructed in Jiangsu power network, includes several PMU substations, data concentrator and central...
This paper presents a new approach of fast stability simulation for on-line transient pre-decision making. The power system simulation process is to solve differential/algebraic equation (DAE). Based on the time domain simulation, this approach focus on the process of disposing fault information in the algebraic equation. A fault port synthesis admittance matrix is defined. It contains the transformed...
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