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Utilities worldwide are concerned about the financial impact of increasing distributed PV adoption among their retail customers. This report analyzes the impact of distributed PV deployment on distribution utility revenues and retail electricity tariffs in Thailand. It provides policymakers, utilities, and other energy practitioners a real-world example of how distributed PV affects certain stakeholders.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
High penetrations of PV on a distribution system can lead to reliability impacts related to overload, voltage, reverse power flow, protection, and circuit configuration. Drawing on the results and lessons-learned from a five-year study of the Southern California Edison (SCE) distribution system from 2010 – 2015, this handbook presents a detailed analysis of the potential impacts and mitigation techniques of PV integration. Written for distribution engineers, the handbook also provides a model-based study guide for assessing PV impacts, covering topics such as model development, data validation and measurement, study criteria, and the steps involved in power flow and fault analysis. While the impacts and mitigation techniques described in this handbook are derived from research that focused on the integration of utility-scale PV systems (1-5 MW), much of the information is also relevant for the integration of a large number of small, distributed PV systems.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
The amount of time required to complete the distributed PV interconnection process can be a significant driver of interconnection costs to PV project developers, utilities, and local permitting authorities. Using data from over 30,000 residential and small commercial systems, this report provides insights from the United States (both nationally and in five states with active solar markets) on the length of time needed to interconnect and deploy distributed PV. The report assesses the number of business days required to 1) apply for and receive utility interconnection review and approval; 2) construct the PV system; 3) pass final local jurisdictional building permit inspection and submit permission-to-operate paperwork to the utility; and 4) receive permission to operate from the utility. It also provides insights on some of the drivers of the interconnection process timeline, which can be used to inform the development of interconnection procedures.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
Estimating the benefits and costs of achieving significant deployment of distributed PV helps power system stakeholders evaluate regulatory measures and compensation programs for distributed PV. To inform these decisions, this report describes current and potential future methods, data, and tools that could be used with different levels of sophistication and effort to estimate the benefits and costs of distributed PV from the utility or electricity-generation system perspective. Although the report is explicitly written in the context of informing estimation of distributed PV costs and benefits to the United States electricity system, the discussions of the various methods, level of effort, and data and modeling requirements provide insights relevant to power systems outside of the U.S. The report provides methodologies for estimating distributed PV benefits and costs for the following categories: energy, environmental, transmission and distribution losses, generation capacity, transmission and distribution capacity, ancillary services, and other factors.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
In anticipation of significant growth in distributed PV in India, this report reviews global and Indian policies and regulations for distributed generation; identifies technical challenges to significantly increasing grid-connected distributed PV; and makes recommendations for addressing power quality, safety, grid stability, and distribution system operation issues. The report provides an example of a country-specific review and synthesis of best practices to inform national and state-level technical and grid code specifications, advanced inverter functionalities, and meter technology considerations, certification, and testing processes.
Located in Topics & Resources / Distributed Generation / Distributed Generation folder
This report summarizes a three-year, U.S. Department of Energy commissioned study that assesses the value of hydropower to the U.S. power system for both pumped and traditional plants. The report includes an assessment of the current market structures and costs and ways to increase the value of hydropower.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
This case study discusses the potential of small, run-of-river hydropower to provide network frequency and voltage control. Included are estimates of the ability of small hydropower to provide ancillary services. The report finds that failure-free and redundant communication equipment to pool and operate hydropower plants are necessary.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
This document explores the benefits of expanding co-optimization of energy and ancillary services to hydropower. The author builds off of practices currently enacted for conventional generators and demonstrates that co-optimization improves the economics of hydropower plants.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
The report reviews cycling costs for power pants, including those related to operating generation at varying load levels (on/off load following) and minimal operation levels. The authors provide the typical cycling costs for “flexible” generation, an overview of the systems and components commonly affected by cycling, and mitigation strategies that minimize cycling costs. The costs are based on Intertek’s APTECH database.
Located in Topics & Resources / Flexible Generation / Flexible Generation folder
This report discusses the links between weather forecasts and photovoltaic (PV) output, as well as the various methods for conducting forecasting. Also included is an example of “upscaling” in which representative systems are used to develop a forecast for a larger pool of systems. The authors also analyze the accuracy of tools and present a survey of tools used worldwide.
Located in Topics & Resources / Forecasting / Forecasting folder
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