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The impact of phase locked loop (PLL) parameters on the dynamic and steady-state behavior of a Voltage Sourced Converter (VSC) in an HVdc transmission system is determined as a function of the system strength (parameterized by the short circuit ratio -SCR). This is achieved by using a linearized small signal model of the converter system and its controls. The model is validated via electromagnetic...
This paper presents a methodology for obtaining the parameters of the equivalent circuit for an induction motor from the information on the nameplate and manufacturer catalog data sheet. The proposed method is straight and noniterative. The variation in rotor parameters for deep bars or double squirrel-cage rotors is modeled and presented as a function of the slip. The results of remarkable points,...
This paper proposes a new fault location technique for EHV double circuit transmission lines using synchronized current and voltage measurements from both ends. Double circuit lines faces difficulties in fault location due to mutual coupling. Modal transformation is used to decouple the coupled transmission line equations. Fault detection and location indices in terms of modal components of measured...
The unified power flow controller (UPFC) is one of the most advanced devices in the flexible AC transmission system (FACTS) family. The modular multilevel converter (MMC) has recently become popular in high voltage direct current (HVDC) transmission and FACTS systems. The application of the MMC in a UPFC is an innovative idea, but its controller features a complex and hierarchical structure that requires...
Solar storms can affect the terrestrial power grid by inducing potential differences between points on the earth. These can couple into the power system through earthed structures such as transformer earths, which in turn can result in transformer saturation through geomagnetically induced current (GIC). For systems such as voltage-source converter (VSC) HVDC, this causes a variety of problems. This...
It becomes necessary to utilize electromagnetic/ electromechanical hybrid simulator to modern large HVAC and DC power system, where multiple HVDC links feed into concentrated load areas. In this paper, a practical real-time hybrid simulator is proposed. The simulator makes RTDS and external transient program running on a computer link together effectively and smoothly. The entire interface schemes...
The Hybrid Power Flow Controller (HPFC) is a Flexible AC Transmission System (FACTS) controller recently proposed to replace the Unified Power Flow Controller (UPFC) at lower capital costs, while providing similar regulation capabilities to address congestion problems. In this paper, an overview of the HPFC and its controls is presented, and its application to the Ontario-Canada grid is discussed...
Optimization of distributed power assets is a powerful tool that has the potential to assist utility efforts to ensure customer voltages are within pre-defined tolerances and to improve distribution system operations. While convex relaxations of Optimal Power Flow (OPF) problems have been proposed for both balanced and unbalanced networks, these approaches do not provide universal convexity guarantees...
This paper investigates the use of metaheuristic evolutionary algorithms to increase simulation accuracy of faulted large scale PV systems. The selected algorithm has been utilized innovatively to extract the internal parameters of the solar cell in fault conditions. PV power plants are subjected to faults and failures typically which requires fast and precise diagnosis. For large scale PV plant,...
Wind power generation with permanent magnet synchronous machines (PMs) has been made possible using power electronic converters. With the increasing use of such systems, the numerically efficient modeling and simulation are of critical importance. As an alternative to traditional qd models, the coupled-circuit phase-domain (CCPD) and voltage-behind-reactance (VBR) models have been recently proposed...
This paper presents a novel model for the short circuit analysis of PV inverter during transient period based on the dynamic phasor sequence component (DPSCs), especially the subtransient period (the first cycle after fault occurred). The model of photovoltaic (PV) inverter is presented as state space equations with DPSCs. The unbalanced fault condition can be given as the input vector in the state...
Internal winding faults are among the most common causes of transformer failure. Once a fault occurs, a fast and efficient method for its detection and location is required to repair and reconnect the device, thus avoiding further delays in the network operation. This paper introduces a simple method for the location of internal winding faults. This method is based on time-domain terminal measurements...
Single-phase three-level NPC inverters are useful for applications in residential areas, where a DC source is available, such as from Photo Voltaic (PV) source or Vehicle-to-Home (V2H) systems. This paper proposes a modeling approach of this type of inverter with SVPWM using a state-space approach, which can be an important tool for the analysis of the dynamics of the inverter when the load changes...
The primary objective of this paper is to highlight the need for and benefits of studying the steady state and dynamic response of power systems using three phase integrated transmission and distribution (T&D) system models (hereafter referred to as hybrid models). Modeling and simulation requirements for building and analyzing hybrid models are also discussed. Finally, results from steady state...
Battery applications are increasing day by day from a single cell to MWh range in electric vehicles, electric traction, PV systems, grid support, etc. Considering energy density and price, correctly apply, size and analyze batteries for these systems remains a major challenge and requires sufficient battery characteristics. Most battery manufacturers provide limited sets of battery charging &...
Accurate modelling of photovoltaic (PV) modules is necessary to understand PV cell operation and to develop maximum power point tracking (MPPT) algorithm for efficient operation of the PV system. A variety of models are proposed in the literature that use a current source, diodes and resistors to represent a PV module. The parameter values involved in the model need to be accurately estimated to improve...
The continuously variable series reactor (CVSR) is a series line reactor designed for power flow control in meshed power system networks. The CVSR is controllable using a variable dc source which establishes the magnetization of the ferromagnetic core and enables continuous modulation of the line reactance. Synthesizing a model that describes operation of the CVSR in ac networks presents challenges...
Transmission line ideal phasing was used to mitigate a distribution voltage imbalance problem. Customers in the common service area of an electrical substation had been reporting power quality problems related to voltage imbalance. Through investigation, an unexpected pattern of seasonal voltage imbalance variation was found to be consistent with transmission network power flow patterns. Linear regression...
This paper develops an integrated multi-domain simulation tool for distribution systems designed specifically for applications in wind power analysis. The proposed tool consists of steady-state, electromechanical transient, and electromagnetic transient models of voltage sources, transmission lines, transformers, capacitor banks, fixed-speed wind turbines (FSWTs), and wide-slip wind turbines (WSWTs)...
Large power systems are complex and real-time modeling of the grid for electromagnetic simulation (EMT) studies is impractical. In general, there are methods that reduce large power system into an equivalent network that requires less computational resource, while preserving electromechanical (low frequency) and high frequency behavior of the original system. This can be achieved by modeling the area...
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