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This paper proposes a new cross-differential protection scheme for a parallel transmission system in the presence of a unified power-flow controller (UPFC) in one line. A cumulative summation technique using three-phase current signals at the sending end is used for fault detection. The faulty phases are then identified by computing the spectral energies of the phasecurrents. The spectral energy of...
The paper proposes a framework for the selection of optimal configuration of line compensation devices, thyristor controlled series capacitors (TCSC) and conventional fixed series capacitors, for reducing the risk of subsynchronous resonance (SSR) in the network while maintaining required power transfer. The methodology developed in the paper is based on the robust risk evaluation of SSR that takes...
The integration of the Dynamic Line Rating (DLR) of Overhead Transmission Lines (OTLs) in power systems Security Constrained Unit Commitment (SCUC) potentially enhances the overall system security as well as its technical/economic performances. This paper proposes a scalable and computationally efficient approach aimed at integrating the DLR in SCUC problem. The paper analyses the case of the SCUC...
This paper presents a novel parallelization approach to speedup EMT simulation, using GPU-based computing. This paper extends earlier published works in the area, by exploiting additional parallelism to accelerate EMT simulation. A 2D-parallel matrix-vector multiplication is used that is faster than previous 1D-methods. Also this paper implements a simpler GPU-specific sparsity technique to further...
Traveling-wave-based protection is becoming attractive in ultra-high-voltage (UHV) transmission systems due to the requirement for high-speed protection. However, the poor transfer characteristics of coupling capacitor voltage transformers (CCVTs) for high-frequency voltage have strictly limited its application. A novel traveling-wave-based protection scheme considering the characteristics of CCVTs...
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...
This paper discusses the Alberta's experience of coordinating High Voltage Direct Current (HVDC) line operation with under-voltage Remedial Action Scheme (RAS). The integration of two 500 kV HVDC transmission projects in the Alberta Interconnected Electric System (AIES) has some impacts on AC system voltage recovery after clearing three phase faults. The resuming of power transfer on HVDC inverters...
To reduce carbon emission from the power generation sectors, retrofitting the power plants with carbon capture system or building new carbon capture power plant (CCPP) is a promising low-carbon power generation option. Under this new planning background, this paper formulates an integrated generation and transmission network expansion planning model, in which the operating mechanisms of CCPP is taken...
Spinning reserve (SR) allocation problem is of vital importance in maintaining power systems security and reliability. Considering forecast uncertainties, unit commitment problem and contingencies on the failure of transmission lines, a general probabilistic model for expected total cost is established and its corresponding solution for optimal SR allocation strategy is proposed. The objective function...
The price of electricity in the Mid-Atlantic (PJM) region of the United States increased during the “Polar Vortex” at the beginning of 2014. Transmission lines were congested because of high demand during the extreme cold weather. The natural gas price for electricity generation increased more than 35% at the end of 2013. Energy Storage Systems (ESS) would have helped the system to overcome many difficulties...
Sen Transformer (ST) emulates an impedance in series with the transmission line and, in turn, allows the active and reactive power flows to change independently, meaning as desired. Traditionally, power flow control has been attempted with the use of a phase angle regulator (PAR), which can only regulate the phase angle of the line voltage and, in turn, allows the active and reactive power flows to...
The low frequency AC (LFAC) transmission, in which a power system is operated at a low frequency, i.e., below 50/60 Hz, is superior to the conventional 60 Hz system in terms of power transfer capability. In addition, due to low operating frequency, the line reactance is reduced and thus voltage drops along the line are decreased. The low frequency transmission thus offers a higher voltage profile...
This paper discusses a novel application of the SSSC which is a VSC-based FACTS device connected in series with the transmission line. An unloaded transmission line experiences Ferranti effect, i.e. the unloaded end of the transmission line experiences a voltage rise, which increases in magnitude as the length of the line increases. The SSSC can inject a controllable voltage in quadrature with the...
We present a model for finding the optimal investment strategy for installing TCSC devices on a transmission network while considering the wind generation and load uncertainties. The proposed TCSC location-allocation problem is a non-linear non-convex mathematical program. We use the general linearization technique to convexify the polynomial constraints. To address the uncertainty of wind power and...
As two 500kV high voltage direct current (HVDC) lines are planned to be installed in the Alberta transmission system in Canada, this work analyzes the potential low frequency oscillations in the system and designs damping controllers for the identified oscillation modes. By performing Prony analysis, oscillation modes in the power system are identified. Two oscillation modes are found in the system...
This paper assesses long term electricity planning under uncertain load growth, gas price, renewable production and new technologies' investment costs for the state of Queensland, Australia in 2030. A stochastic programming approach is mathematically formulated to decide which technology to be built, while determining its capacity and location. Additionally, new investments in transmission lines are...
This paper investigates sub-synchronous resonance (SSR) phenomena inside a doubly-fed induction generator (DFIG) based wind farm, considering the impact of the spatial distribution of wind speed. Firstly, the impedance model of a one-DFIG aggregated model based wind farm is presented to analyze the induction generator effect. Then, a two-DFIGs aggregated impedance model, considering DFIGs in both...
Locational marginal price (LMP) is a market-pricing method used to determine optimal dispatch of interconnected power systems. In order to take system's operating risk into consideration, a modified risk-based LMP (RLMP) calculation method is given in this paper. We design a risk-based decentralized synergetic dispatch pattern in electricity market environment to avoid the drawbacks of centralized...
This paper presents a method to interconnect and synchronize two instances of real time simulation. A Bergeron transmission line model is utilized as interface between two simulation instances. Communication to transfer the necessary transmission line model quantities is implemented by utilizing TCP/IP socket communication. Part of the real time simulator includes the hardware communication facility...
In Cyber-Physical Power System (CPPS), cyber system and the possible cyber attacks may affect the behavior of physical system. This paper deals with the reliability impact of cyber attacks against monitoring functions to CPPS. Firstly, the monitoring function failure model considering possible cyber attacks is proposed. Secondly, the reliability impact of transmission line monitoring function failure...
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