scholarly journals Model of Operation-and-Maintenance Costs for Photovoltaic Systems

2020 ◽  
Author(s):  
H. Walker ◽  
Eric Lockhart ◽  
Jal Desai ◽  
Kristen Ardani ◽  
Geoff Klise ◽  
...  
Keyword(s):  
Photovoltaic Systems ◽  
Maintenance Costs ◽  
Operation And Maintenance

scholarly journals OPTIMALITY OF CONTROL LIMIT MAINTENANCE POLICIES UNDER NONSTATIONARY DETERIORATION

1999 ◽  
Vol 13 (1) ◽  
pp. 55-70 ◽  
Author(s):  
Zvi Benyamini ◽  
Uri Yechiali
Keyword(s):  
Optimal Policy ◽  
Transition Probabilities ◽  
Stationary Problem ◽  
Control Limit ◽  
Maintenance Costs ◽  
Operation And Maintenance ◽  
Deterioration Process ◽  
Maintenance Policies ◽  
Deteriorating Systems ◽  
Limit Form

Control limit type policies are widely discussed in the literature, particularly regarding the maintenance of deteriorating systems. Previous studies deal mainly with stationary deterioration processes, where costs and transition probabilities depend only on the state of the system, regardless of its cumulative age. In this paper, we consider a nonstationary deterioration process, in which operation and maintenance costs, as well as transition probabilities “deteriorate” with both the system's state and its cumulative age. We discuss conditions under which control limit policies are optimal for such processes and compare them with those used in the analysis of stationary models.Two maintenance models are examined: in the first (as in the majority of classic studies), the only maintenance action allowed is the replacement of the system by a new one. In this case, we show that the nonstationary results are direct generalizations of their counterparts in stationary models. We propose an efficient algorithm for finding the optimal policy, utilizing its control limit form. In the second model we also allow for repairs to better states (without changing the age). In this case, the optimal policy is shown to have the form of a 3-way control limit rule. However, conditions analogous to those used in the stationary problem do not suffice, so additional, more restrictive ones are suggested and discussed.

Benchmarking operation and maintenance costs of French healthcare facilities

2011 ◽  
Vol 9 (4) ◽  
pp. 266-281 ◽  
Author(s):  
Samer Sliteen ◽  
Halim Boussabaine ◽  
Orlando Catarina
Keyword(s):  
Maintenance Costs ◽  
Healthcare Facilities ◽  
Operation And Maintenance

Manage Successful Brownfield Applications

2018 ◽  
Author(s):  
Jian Sun ◽  
Kevin Blostic
Keyword(s):  
Mixed Mode ◽  
System Capacity ◽  
Signaling System ◽  
Maintenance Costs ◽  
Signaling Systems ◽  
Train Control ◽  
Operation And Maintenance ◽  
Track Circuit ◽  
Railroad Applications ◽  
New System

This paper provides a unique perspective on successful brownfield railroad applications. It presents realistic challenges and solutions when applying a turnkey solution with a replacement or an overlay system. Brownfield commissioning takes place when an existing infrastructure is to upgrade to a new system with a different technology than the incumbent one. As signaling systems are getting more and more complex, it is extremely important to maintain robustness in the system design as well as project execution, such as logistics, documentation, and issue reporting. Many transportation authorities are moving from their current train control signaling system to a new system to combat obsolescence issues, to gain better system capacity, and to lower operation and maintenance costs. This paper discusses brownfield commissioning in general, and also presents specific cases in migration from a track circuit interlocking system to a Communications Based Train Control (CBTC) system. These two systems have distinct characteristics that provide opportunities of coexistence, but also introduce difficulties in mixed-mode operations.

scholarly journals Analysis of Contracts to Build Energy Infrastructures to Optimize the OPEX

2020 ◽  
Vol 12 (17) ◽  
pp. 7232
Author(s):  
Jesus Javier Losada-Maseda ◽  
Laura Castro-Santos ◽  
Manuel Ángel Graña-López ◽  
Ana Isabel García-Diez ◽  
Almudena Filgueira-Vizoso
Keyword(s):  
Energy Sector ◽  
Maintenance Cost ◽  
Maintenance Costs ◽  
Execution Costs ◽  
Operation And Maintenance ◽  
Maximum Profit ◽  
Hydroelectric Plants ◽  
Operation And Maintenance Cost ◽  
Contractual Agreement ◽  
Energy Infrastructures

The employer (owner) of the project wants to obtain the maximum profit for the money invested and the consultant (contractor) will try to give less for that money. The regulation of their relationship is based on the contractual agreement, which in the energy sector is mainly based on the engineering, procurement, and construction (EPC) model. The objective of this work was to evaluate which factors should be included in the drafting of contracts, to minimize problems between the parties, and thus minimize execution costs and optimize operation and maintenance costs. Information and data on the integration of operability and maintainability criteria in contracts for 158 projects, with a total contract value of close to €40,000M, were analyzed. Several of those projects corresponded to wind, solar, and hydroelectric plants. The information collected the perception of the agents involved, and was classified according to the experience of the agents consulted in the operation and maintenance areas. Finally, the proposed criteria were prioritized. In general, the owner is willing to introduce these criteria in his contracts if they reduce the operation and maintenance cost by around 1–5%, while the contractor is interested in increasing his probability to be selected by 1–3%.

A review of photovoltaic systems: Design, operation and maintenance

Solar Energy ◽  
2019 ◽  
Vol 188 ◽  
pp. 426-440 ◽  
Author(s):  
Luis Hernández-Callejo ◽  
Sara Gallardo-Saavedra ◽  
Víctor Alonso-Gómez
Keyword(s):  
Systems Design ◽  
Photovoltaic Systems ◽  
Operation And Maintenance

scholarly journals The Feasibility Analysis of Using a New Network Architecture to Solve the Tidal Effects

2012 ◽  
Vol 4 ◽  
pp. 51-55
Author(s):  
Wei Na Hou ◽  
Xian Wei Cao ◽  
Zhan Jun Liu
Keyword(s):  
Resource Utilization ◽  
Network Architecture ◽  
High Energy ◽  
Tidal Effect ◽  
Base Stations ◽  
Feasibility Analysis ◽  
Tidal Effects ◽  
Maintenance Costs ◽  
Operation And Maintenance ◽  
Construction Operation

To solve high cost, high energy and many other issues in the communication, propose a new network architecture, one of the important applications is to solve the "tidal effect", by BBUs uniform placement to achieve unified deployment of resources to get the purpose of saving computation. But its feasibility has not been verified, this paper will verify its feasibility by data from two aspects of changing the number of base stations and changing the different situations of the base stations. Be measured through simulation and analysis results show that the use of new network architecture can not only save computation, but also enhance the resource utilization and reduce construction, operation and maintenance costs.

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