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For controlling distributed controllable units in radial distribution networks, a method based on alternating direction method of multipliers (ADMM) for dynamic distributed optimal power flow (DOPF) is designed. The convex DistFlow model for power flow is spitted into two layers. Based on power flow of distribution networks, distribution system operators (DSOs) in the upper layer calculate shadow...
We study the profitable amount of additional storages in the German electricity network. The more storages there are the less profitable they become. To account for this effect, we construct a price model based on German data from 2015. This price model is based on the merit order theory and the explanatory variables are conventional generation and export. Then we build a cost model for different...
Recent studies have shown that multi-step optimization based on Model Predictive Control (MPC) can effectively coordinate the increasing number of distributed renewable energy and storage resources in the power system. However, the computation complexity of MPC is usually high which limits its use in practice. To improve the efficiency of MPC, in this paper, we apply a distributed optimization method...
Careful design and planning is essential for successful integration of energy storage system (ESS) in a shipboard dc hybrid power system. An optimization model for resiliency enhancement and total cost reduction is proposed in this paper. The resilience of a shipboard power system with and without ESS are evaluated by means of resiliency index values under fault conditions. Furthermore, the influence...
This paper investigates the impact of demand response (DR) management on improving the social welfare of remote communities by integrating renewable energy (RE) resources into their diesel generator-based isolated microgrids. A multiple-year planning optimization problem is developed to determine the optimal combination of RE resources and energy storage system (ESS) while considering demand response...
In a power system network, the system power needs are met by all the generating stations working in coordination. When there are many power generating units, a lot many operating strategies are possible to meet the time based varying power demand. In this paper, an optimization study is carried out to checkout the cost effectiveness of using a deloaded photovoltaic (PV) instead of battery. The three...
Nowadays, wind energy has become a very viable alternative solution to provide electrical energy. The development of wind energy is especially relevant for the case of isolated island in the south central provinces of Vietnam, where there is great potential for wind energy. For these isolated systems, the co-generation of diesel generators and wind turbines is a common configuration, but also poses...
This paper proposes an optimization-based decision support strategy to enhance the management of the distributed energy sources of an islanded microgrid. The solutions provided by the optimization algorithm are compared with the current strategy, already implemented in a real site microgrid on Lencois' island/Brazil. Significant economic and energy savings are achieved when the optimal management...
The goal of this paper is to present the efficiency and performance of a new ternary energy storage model in the competitive electricity market. Using the state-of-the-art mixed-integer progamming technique, the new energy storage model can be explicitly cast as ternary states: (−1) PUMP, (0) OFF, and (1) GEN to represent the physical energy storage constraints and desired operating parameters in...
Multi-period optimal power flow (OPF) is a basic tool to achieve optimal operation of a power system with energy storages devices and renewable sources. A novel convex relaxation based decomposeition algorithm is proposed in this paper to solve the full AC multi-period OPF with energy storages and renewable sources. Based on alternating direction method of multipliers (ADMM), the original time-correlated...
This paper proposes a novel optimization technique using Linear Programming (LP) method to solve the optimal scheduling problem of Distributed Energy Resources (DERs) including Battery Energy Storage Systems (BESS). The proposed optimization technique has a dual objective function of economics and peak-shaving. Optimization of the BESS operation is a complex problem as it has special constraints such...
This paper presents a closed-loop model in which commercial building aggregators (CBAs) minimize their operating costs in a wholesale electricity market, considering wind power uncertainties that are modeled as contingencies using a set of forecast error scenarios. Specifically, the CBAs determine the optimal energy consumption and reserve deployment of variable speed heat pumps (VSHPs) and plug-in...
With spreading of renewable energy in energy mix of national grids, the issue of high capacity and efficient energy storage is becoming very critical. A comprehensive model of South African power grid developed at the University of Pretoria is presented in this work. The model contains all notable power generators in the country. Mixed integer non-linear optimisation techniques are employed for unit...
With 1.3 billion people lacking access to electricity, the demand for power is increasing drastically. Electricity can no longer be considered a luxury, and is necessary for maintaining a modern life expectancy. This paper explores the feasibility of energy production and storage across South America, South East Asia and sub-Saharan Africa with National Renewable Energy Lab's Geospatial Toolkit and...
We investigate the problem of power balancing in a general renewable-integrated power grid with storage and flexible loads. We consider a power grid that is supplied by one conventional generator (CG) and multiple renewable generators (RGs) each co-located with storage, and is additionally connected with external markets. An aggregator operates the power grid and aims at minimizing the long-term system...
The present paper develops a model to optimize the daily operation of a hybrid energy system consisting of a hydrokinetic, a pumped hydro storage system and a diesel generator. The optimization approach is aimed at minimizing the cost function subject to the availability of water resource, the variable load requirements, and operational constraints of the hybrid system's components. The main purpose...
In past few years, the developing technology of energy storage has greatly catalyzed the evolution of energy management in power systems. The availability of storage techniques makes it possible to integrate large-scale energy storages, mitigating supply/demand variation and fluctuations brought by renewables. This paper proposes an optimal power flow (OPF) model considering energy storage with adaptive...
In this paper an optimization algorithm is applied on a microgrid with renewable energy and distributed generation. The intermittent electricity in Lebanon leads to widely use diesel generator groups and to install renewable energy in private places in order to cover the consumption during the power cut. The proposed case study consists of three energy hubs integrating renewable energy, diesel engines,...
Integrating additional wind energy into the existing power system may cause wind curtailment due to the system operational constraints and reliability requirements. Effective ways to mitigate this problem are to use energy storage or increase transmission capacity. In this paper, the impacts of coordinating with pumped storage and increasing transmission capacity on wind output curtailment mitigation...
In this paper, an entire formulation of a multiperiod optimal power flow is presented. The standard timeindependent AC Optimal Power Flow (AC-OPF) includes voltage, line capacity and generator limits for each time step. Additionally, time-dependent constraints like generator rampings, stored energy or energy contracts are crucial for time constrained optimization. A comparison of methods for modeling...
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