The purpose of this part of IEC 62898 is to provide guidelines for the specification of fault protection and dynamic control in microgrids. Protection and dynamic control in a microgrid are intended to ensure safe and stable operation of the microgrid under fault and disturbance conditions.<\/p>\n
This document applies to AC microgrids comprising single or three-phase networks or both. It includes both isolated microgrids and non-isolated microgrids with a single point of connection (POC) to the upstream distribution network. It does not apply to microgrids with two or more points of connection to the upstream distribution network, although such systems can follow the guidelines given in this document. This document applies to microgrids operating at LV or MV or both. DC and hybrid AC\/DC microgrids are excluded from the scope, due to the particular characteristics of DC systems (extremely large fault currents and the absence of naturally occurring current zero crossings).<\/p>\n
This document defines the principles of protection and dynamic control for microgrids, general technical requirements, and specific technical requirements of fault protection and dynamic control. It addresses new challenges in microgrid protection requirements, transient disturbance control and dynamic disturbance control requirements for microgrids. It focuses on the differences between conventional power system protection and new possible solutions for microgrid protection functions.<\/p>\n
Depending on specific situations, additional or stricter requirements can be defined by the microgrid operator in coordination with the distribution system operator (DSO).<\/p>\n
This document does not cover protection and dynamic control of active distribution systems. This document does not cover product requirements for measuring relays and protection equipment.<\/p>\n
This document does not cover safety aspects in low voltage electrical installations, which are covered by IEC 60364 (all parts and amendments related to low-voltage electrical installations). Requirements relating to low voltage microgrids can be found in IEC 60364-8-2.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4 Microgrid protection requirements 4.1 General <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.2 Main requirements specific to microgrids 4.2.1 General 4.2.2 Phase fault protection <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.2.3 Earth fault protection 4.3 General protection requirements 4.3.1 General 4.3.2 Dependability of protection <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.3.3 Security of protection 4.3.4 Availability and selectivity of protection <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 4.3.5 Operating time (speed) of protection 4.4 Particular requirements for non-isolated microgrids <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 4.5 Particular requirements for isolated microgrids 5 Protection systems for microgrids 5.1 General <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 5.2 Short-circuit protection 5.2.1 Overcurrent protection <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figures Figure 1 \u2013 Ratio between maximum load current\/minimum short-circuit current in the microgrid <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 5.2.2 Directional overcurrent protection <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 5.2.3 Distance protection 5.2.4 Directional power protection 5.2.5 Differential protection <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 5.3 System protection 5.3.1 Under\/over voltage protection <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 5.3.2 Frequency protection 5.4 Centralized protection systems <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 6 Dynamic stability and control 6.1 General 6.2 Dynamic stability in microgrids 6.2.1 General <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 6.2.2 Disturbances in microgrids 6.2.3 Voltage and frequency stability <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 6.3 Dynamic control in microgrids 6.3.1 General requirements 6.3.2 Dynamic control functions <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 6.3.3 Control elements in microgrids Figure 2 \u2013 Control elements in microgrids <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 6.3.4 Control systems of microgrids <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure 3 \u2013 Hierarchical control levels of a microgrid Figure 4 \u2013 Centralized multilevel control of microgrids <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 6.3.5 Control of microgrids during grid-connected mode 6.3.6 Control of microgrids during island mode <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Annex A (informative) Use cases for dynamic control of microgrids Figure A.1 \u2013 Simple microgrid platform for testing transient disturbance during motor start-up Figure A.2 \u2013 Transient control strategy based on reactive current compensation control <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure A.3 \u2013 Voltage profile during field testing of transient disturbance with and without transient control device Figure A.4 \u2013 Current profile during field testing of transient disturbance with and without transient control device <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure A.5 \u2013 Microgrid platform with high proportion of RES for testing dynamic disturbance control Figure A.6 \u2013 Dynamic control strategy <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure A.7 \u2013 Voltage profile of field testing with and without dynamic control device <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Microgrids – Technical requirements. Protection and dynamic control<\/b><\/p>\n |