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【世界银行】从太阳到屋顶再到电网:电力系统和分布式光伏(英).pdf
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【世界银行】从太阳到屋顶再到电网:电力系统和分布式光伏(英).pdf
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1
FROM SUN TO ROOF TO GRID
Power Systems and Distributed PV
TECHNICAL REPORT
Public Disclosure AuthorizedPublic Disclosure AuthorizedPublic Disclosure AuthorizedPublic Disclosure Authorized
© 2023 International Bank for Reconstruction
and Development / The World Bank
1818 H Street NW | Washington DC 20433
202-473-1000 | www.worldbank.org
This work is a product of the staff of The World Bank with external contributions. The ndings,
interpretations, and conclusions expressed in this work do not necessarily reect the views of
The World Bank, its Board of Executive Directors, or the governments they represent. The World
Bank does not guarantee the accuracy of the data included in this work. The boundaries, colors,
denominations, and other information shown on any map in this work do not imply any judgment
on the part of The World Bank concerning the legal status of any territory or the endorsement or
acceptance of such boundaries.
RIGHTS AND PERMISSIONS
This work is available under the Creative Commons Attribution 3.0 IGO license (CC BY 3.0 IGO)
http://creativecommons.org/licenses/by/3.0/igo. Under the Creative Commons Attribution license,
you are free to copy, distribute, transmit, and adapt this work, including for commercial purposes,
under the following conditions:
Attribution—Please cite the work as follows: Energy Sector Management Assistance Program
(ESMAP). 2023. From Sun to Roof to Grid: Power Systems and Distributed PV. Technical Report.
Washington, DC: World Bank. License: Creative Commons Attribution CC BY 3.0 IGO
Translations—If you create a translation of this work, please add the following disclaimer along with
the attribution: This translation was not created by The World Bank and should not be considered
an ofcial World Bank translation. The World Bank shall not be liable for any content or error in this
translation.
Adaptations—If you create an adaptation of this work, please add the following disclaimer along
with the attribution: This is an adaptation of an original work by The World Bank. Views and opinions
expressed in the adaptation are the sole responsibility of the author or authors of the adaptation and
are not endorsed by The World Bank.
Third-party content—The World Bank does not necessarily own each component of the content
contained within the work. The World Bank therefore does not warrant that the use of any third party-
owned individual component or part contained in the work will not infringe on the rights of those third
parties. The risk of claims resulting from such infringement rests solely with you. If you wish to reuse
a component of the work, it is your responsibility to determine whether permission is needed for that
reuse and to obtain permission from the copyright owner. Examples of components can include, but
are not limited to, tables, gures, or images.
All queries on rights and licenses should be addressed to World Bank Publications,1818 H Street NW,
Washington, DC 20433, USA; e-mail: pubrights@worldbank.org.
PRODUCTION CREDITS
Designer | Circle Graphics, Inc.
Images | Satellite imagery from Maxar Technologies analyzed and processed by NEO B.V. (www.neo.nl)
to show building type and/or rooftop PV potential. Front and back covers: Manila, Philippines;
page 8: Dhaka, Bangladesh; page 12: Lagos, Nigeria; page 38: Grenada; page 46: Izmir, Türkiye;
page 82: Manila, Philippines. ©World Bank. Used with permission. Further permission required for
reuse. All images remain the sole property of their source and may not be used for any purpose
without written permission from the source.
3
TABLE OF CONTENTS
5 ABSTRACT
6 ABOUT THIS SERIES
7 ACKNOWLEDGMENTS
9 KEY MESSAGES
13 CHAPTER 1: HOW IMPORTANT
IS DPV FOR POWER SYSTEM
PLANNERS AND OPERATORS?
13 DPV has Distinct Implications for Power
Systems Around the World
16 Different DPV Systems Feed All, Some or
None of Their Output to the Grid
18 DPV Impacts on Power Systems Evolve
as Deployment Grows
23 CHAPTER 2: TECHNICAL
SOLUTIONS FOR GRID-FRIENDLY
DPV
24 Solutions Menu 1: Local Load Balancing
30 Solutions Menu 2: Enhancing Hosting
Capacity
39 CHAPTER 3: GRID CODES FOR
GRID-FRIENDLY DPV
39 Suggested Grid Code Elements for DPV
41 The Rationale for Specifying DPV Inverter
Behavior in Grid Codes
43 DPV System Equipment Standards
and Certification are Important for
Enforcement of Grid Codes
44 Procedures for DPV Connection Should
be Simple and Pragmatic
47 CHAPTER 4: APPROACHES TO
POWER SYSTEM PLANNING
WITH DPV
47 Traditional Power System Planning
Approaches Vary by Country and Are
Evolving
49 Power System Planning can Address
DPV in a Variety of Ways
51 General Steps and Principles for Power
System Planning with DPV
60 Conclusion: Beyond Technical Issues
61 ANNEX A: TECHNICAL DESCRIPTIONS
OF NINE DPV USE CASES FOR LMIC
s
61 Use Case 1: Bill Reduction
61 Use Case 2: Least-Cost Backup
64 Use Case 3: Least-Cost Generation
65 Use Case 4: Transmission & Distribution
Alternative
66 Use Case 5: Utility Bootstrap
66 Use Case 6: Ancillary Services
67 Use Case 7: Community Social Support
69 Use Case 8: Financial Loss Reduction
70 Use Case 9: Box Solution
71 ANNEX B: DISTRIBUTION GRID
TECHNICAL STANDARDS
73 ABBREVIATIONS
74 GLOSSARY
77 REFERENCES
FROM SUN TO ROOF TO GRID: POWER SYSTEMS AND DISTRIBUTED PV
4
List of Figures
Figure 1: Overview of Potential Power Sector
Issues and Solutions for Grid-Friendly DPV 10
Figure 2: Types of Arrangements for
Distributed Generation Fed into the Grid 17
Figure 3: Voltage Along a Radial Feeder
Under Different Conditions of Load and
DPV Output Fed to Grid 19
Figure 4: Rapid Evening Drop in DPV
Generation with Ramp Up of Other
Sources, Australian Example 21
Figure 5: Distribution Grid Effects from
DPV by Level of Penetration and Cost
Range of Solutions 26
Figure 6: PV Sized Greater than the Inverter
Capacity Clips Peak but Increases
Non-Peak Output 29
Figure 7: Technical Services that DPV
Inverters May Provide Based on
Available Characteristics 31
Figure 8: User Interface, ESMAP’s Simplified
Solar PV Forecasting Tool 36
Figure 9: Grid Code Formulation Guidance by
Grid Size and Level of Variable Renewable
Penetration 42
Figure 10: Certification and the ‘Chain of
Trust’ for DPV Equipment 44
Figure 11: General Steps Relevant for Different
Approaches to Planning 51
Figure 12: Potential Impacts of Variable
Renewables on Grids at Different Time
Scales and Spatial Areas for Studies 53
Figure 13: A Site Analysis Using the
Global Solar Atlas 55
List of Tables
Table A: Power System Solutions to
DPV Issues from Low to High Penetration 25
Table B: Relevant Grid Code Items for
DPV System Requirements 40
List of Boxes
Box 1: DPV Use Cases with Technical
Benefits for Power Systems 15
Box 2: Radial versus Other Types of
Distribution Feeder 20
Box 3: Aggregation of DPV Into Virtual
Power Plants 27
Box 4: Grid-Following and Grid-Forming
Inverters 33
Box 5: Technical Screening Criteria:
Helpful or Not? 45
Box 6: Assessing Integration of Renewables
for Thailand’s Power System 50
Box 7: Mapping DPV’s Technical Potential 54
Box 8: Distribution System Planning Tools 57
5
Rapid growth of distributed photovoltaics (DPV) has upended how engineers
traditionally think about electric power systems. Consumers now increasingly
generate their own power and feed it to the grid. Poorly managed DPV poses
distinct risks for power systems as penetration increases. Yet, low- and middle-
income countries can benet from this clean distributed energy resource. How
can DPV systems, distribution networks, and the power system be planned and
operated to mitigate risks and reap technical benets? This report, the second in
a series of three, presents a menu of technical solutions applicable across diverse
contexts. Balancing DPV supply with local loads, as far as practical, can help keep
grid operations within technical limits. A grid’s hosting capacity for DPV can also
be enhanced on multiple fronts to cope with changed conditions. Many solutions
are inexpensive. Inverter programming unlocks valuable services. Anticipating
challenges and opportunities can avoid costly xes. All countries can benet from
a grid code and planning approach that reect expected growth of distributed
resources. Prudent technical criteria can be used to streamline new approvals for
grid-friendly DPV. Technical measures also require the timely capacity building of
personnel. Examples of standards are provided for readers seeking more details.
ABSTRACT
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