Optimal non-zero Price Bids for EVs in Energy and Reserves Markets using Stochastic Optimization

In power systems, demand and supply always have to be balanced. This is becoming more challenging due to the sustained penetration of renewable energy sources. Because of the increasing amount of electrical vehicles (EVs), and the high capacity and flexibility of their charging process, EVs are a good candidate for providing balancing services...

Decision diagrams for decomposed mixed integer linear programs

A recent development in the field of discrete optimization is the combined use of (binary) decision diagrams (DD) and branch and bound for optimization. This method has been shown to outperform integer linear programming on several classic problems. The performance of DDs in integer optimization raises the question if this method can be extended...

Exploring Optimal Pump Scheduling in Water Distribution Networks with Branch and Bound Methods

Water utilities can achieve significant savings in operating costs by optimising pump scheduling to improve efficiency and shift electricity consumption to low-tariff periods. Due to the complexity of the optimal scheduling problem, heuristic methods that cannot guarantee global optimality are often applied. This paper investigates...

Assessment of operation reserves in hydrothermal electric systems with high wind generation

In this paper, we propose a method to analyze the amount of operation reserves procured in a system based on two stages. The first stage is a detailed hourly unit commitment and the second stage is a simulation model with a shorter time period. The method is applied to the Spanish hydrothermal system and several cases are analyzed to determine...

Vessel routing for sweeping of marine litter in a port area

In literature it is widely accepted that 80% of the marine litter originates from land based sources. Since seaports usually are strategically situated with an inland waterway connection, it is not surprising that seaports have to deal with marine litter. Port authorities would like to avert excessive amounts of marine litter by sweeping marine...

Railway disruption management

Railway networks are susceptible to disturbances and disruptions caused by failures in the infrastructure and rolling stock which lead to delays and inconvenience for passengers. Disruption management is currently performed manually by dispatchers and can be improved by using dispatching support systems that can calculate optimal solutions using...

Power-Capacity and Ramp-Capability Reserves for Wind Integration in Power-Based UC

This paper proposes a power-based network-constrained unit commitment (UC) model as an alternative to the traditional deterministic UCs to deal with wind generation uncertainty. The formulation draws a clear distinction between power-capacity and ramp-capability reserves to deal with wind production uncertainty. These power and ramp requirements...

Tight MIP formulations of the power-based unit commitment problem

This paper provides the convex hull description for the basic operation of slow- and quick-start units in power-based unit commitment (UC) problems. The basic operating constraints that are modeled for both types of units are (1) generation limits and (2) minimum up and down times. Apart from this, the startup and shutdown processes are also...

MIPLIB Truckload PDPTW Instances Derived from a Real-World Drayage Case

This paper describes five sets of 33 Mixed Integer Problem instances each, for a total of 165 instances, derived from a real-world full-truckload pick-up and delivery problem with time windows at the Port of Rotterdam. These instances represent 33 individual days of data encompassing 65 jobs and 40 trucks. We report, in this paper, on the...

The Dynamic Dial-a-Ride Problem with Time Windows in a Competitive Multi-Company Environment

Door-to-door transportation for elderly and disabled people is for many governments an important instrument to increase the mobility of this group of people. Many issues arise in the implementation of such a system, which is often modeled as the Dynamic Dial-a-Ride System with Time Windows (DDARPTW). One of those issues is that taxi companies...