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The objective of the paper is to implement alternative direction method of multipliers (ADMM) to solve a nonconvex alternating current optimal power flow (AC OPF) problem. There is no guarantee of convergence for ADMM when it is applied to a nonconvex optimization problem. In this article, we not only present the procedure of consensus ADMM implementation on an AC OPF problem for IEEE 14-bus system...
In this paper, system identification is carried out for a 20 kWh battery using real-world measurements data. State-of-charge (SOC) and the open-circuit voltage (Voc) relationship will be obtained using least square estimation (LSE) non-linear regression. In addition, how to estimate SOC using current measurements and how to estimate the equivalent circuit's RC parameters are carried out using autoregressive...
This paper presents two models of AC optimal power flow based Financial Transmission Rights (FTRs) allocation auction. Both models were compared with the conventional DC optimal power flow (DC-OPF) based model. Considering an FTR between two nodes as a real power injection at the source node and a power withdrawal at the sink node; the first model assumes that the net power due to FTRs equals zero...
In this paper, we consider an optimization problem solving for model predictive control (MPC) of a modular multilevel converter (MMC). An MMC consists of a large number of submodules. The objective of the MPC is to determine the best switching sequences for the submodules in the MMC to track the phase current references for T time horizons. The MPC is formulated as a nonlinear mixed-integer programming...
In this article, a salient synchronous machine starting up process is emulated, and the simulation is carried out in MATLAB/Simulink. The dynamics of the simulation model include the three-order electromagnetic dynamics and two-order swing dynamics without the normal operation assumption. The model is derived based on the space vector concept and two-axis theory. Torque generation is also explained,...
The objective of this paper is to explore two engineering applications of convex relaxation of AC OPF: (i) to conduct economic dispatch at heavy loading conditions; and (ii) to identify the system's loading limit. The conventional AC OPF formulation solved by interior point method has difficulty to converge when the system is reaching its loading limit due to the singularity of the Jacobian matrix...
During an islanding operation of a microgrid comprised of multiple distributed generation (DG) units serving a load, DG units interfaced with voltage-sourced converters (VSC) are regarded as the only energy sources. Hence, DG units should be controlled to form the frequency and voltage, pick up the full load, and respond to any load changes. Conventional P — f/Q — V droop controller enables a communication-less...
This paper proposes a novel robust cascade structure which has better performance when the transmission line undergoes a perturbation. Cascade control structure is normally used when the control procedure can be split into two (or more) cascaded parts. Compared with the conventional cascade control structure which has a limited ability to handle the perturbation in the plant model, the novel structure...
Phaser measurement units (PMUs) provide synchronized measurements of voltage and current phasors and can make state estimation more accurate. The objective of optimal PMU placement (OPP) problem is to minimize the number of PMUs required for the system to be completely observable. This paper presents two different formulations of optimal PMU placement (OPP) problem: mixed integer linear programming...
A real Chinese power grid where a vector controlled unified power flow controller (UPFC) has just been installed is researched in this paper. Firstly, the principle of vector control strategy is presented. Then the linearized model of the power grid is established. Based on the model, damping torque analysis (DTA) method is described. By using the DTA method, the best channel to install the damping...
This paper presents distributed control algorithm implementation in Power System Toolbox (PST). The distributed control algorithm is based on consensus and subgradient method. According this algorithm, each agent in a power system network can exchange information with their direct connected neighbors to unify all local marginal prices by consensus method. Synchronously, all agents update price information...
This paper proposes a robust power system stabilizer (PSS) using Lyapunov Stability theory introduced in Optimization & Control in Power System class at University of South Florida. This research examines the robustness of the novel PSS in the synchronous generator connected to an infinite bus (SMIB) system under multiple operation conditions. After deriving the state space matrices of the linear...
Parameter identification of a synchronous generator based on Phasor Measurement Unit (PMU) data requires autoregressive exogenous (ARX) models. This paper presents ARX model derivation and validation of two synchronous generator models. The first one is a third-order ARX model including electromechanical dynamics, turbine-governor dynamics and primary frequency control. Input of the model is power...
In this paper, we reviewed several forms of alternating direction method of multipliers (ADMM) for distributed power system computing. The major focus is on ADMM based distributed parallel optimization algorithm which is feasible to be implemented in power network. Firstly, we introduced the general form of ADMM, and extend the 2-block ADMM to N-block multi-block ADMM. Next, we focus on two distributed...
This article presents an important finding: the parameters of secondary frequency control based on integral or proportional integral control can be tuned to achieve economic operation and frequency regulation simultaneously. We show that if the power imbalance is represented by frequency deviation, an iterative dual ascent based economic dispatch solving is equivalent to integral control. An iterative...
In this article, a general Benders Decomposition is applied to solve a stochastic mixed integer programming formulation (SMIP) to obtain the optimal sizing of a photovoltaic system (PV) and battery energy storage system (BESS) to power a Residential Heating Ventilation and Air- Conditioning System (HVAC). The uncertainty of PV-output is stochastically modeled using different scenarios with the probability...
Model-based engineering has emerged as a key set of technologies to engineer software systems. While system source code is expected to match with the designed model, legacy systems and workarounds during deployment would undoubtedly change the source code, making the actual running implementation mismatch with its model. Such mismatch poses a challenge of maintaining the conformance between the model...
This paper presents an optimization problem of siting capacitors in a power network to achieve economic benefits. The formulated optimization problem is a nonlinear mixed integer programming problem. In order to find an approximate optimal solution, Benders decomposition is adopted. The optimization problem will be decomposed into a main problem and a subproblem. The subproblem determines dispatch...
This paper proposes that a medium voltage level power Modular Multilevel Converter (MMC) based induction machine drive. MMC replaces a two-level voltage source converter (VSC) to drive an induction motor because of its high voltage power range. A designed 5-level three-phase dc-to-ac MMC is analyzed on the circular topology. The indirect field orientated vector control (FOC) is used to control the...
USF Smart Grid Power System Lab (SPS) has developed an hardware-in-loop (HIL) SCADA testbed. This paper describes several communication/control architectures of the testbed with different hardware/software combinations. This testbed will be used to test energy management schemes, power grid cyber attack and mitigation strategies. Phasor Measurement Units (PMUs) synchronized with the common GPS reference...
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