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BSI PD IEC TS 62786-1:2023

BSI PD IEC TS 62786-1:2023

$189.07

Distributed energy resources connection with the grid – General requirements

Published By Publication Date Number of Pages
BSI 2023 50
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 1 Scope and object
2 Normative references
10 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
14 Figures
Figure 1 – Example of electricity generating plant connected to a network(schematic view of switches)
16 4 Requirements for generating plants
4.1 General
4.2 Connection scheme
4.3 Choice of switchgear
4.3.1 General
17 4.3.2 Interface switch
4.4 Normal operating range
4.4.1 General
4.4.2 Operating frequency range
4.4.3 Operating voltage range
Tables
Table 1 – Operating frequency requirements of DER
18 4.5 Immunity to disturbances
4.5.1 General
4.5.2 Rate of change of frequency (ROCOF) immunity
Table 2 – Operating voltage requirements of DER
19 Figure 2 – Underfrequency ride through capability requirements of DER
Figure 3 – Overfrequency ride through capability requirements of DER
20 4.5.3 Undervoltage ride through (UVRT) requirements
Figure 4 – Instantaneous frequency change ride through requirement of DER
Figure 5 – Undervoltage ride through capabilityrequirements of DER
21 4.5.4 Overvoltage ride through (OVRT) requirements
Figure 6 – Power recovering requirements for UVRT operation of DER (example)
22 4.5.5 Rapid phase angle change immunity
Figure 7 – Overvoltage ride through capability
Figure 8 – Example of instantaneous voltage phase angle change during UVRT
23 4.6 Active power response to frequency deviation
4.7 Power response to voltage changes
4.7.1 General
4.7.2 Voltage support by reactive power
Figure 9 – Typical power-frequency response curve
24 4.7.3 Reactive power control modes
4.7.4 Voltage related active power control
Table 3 – Volt watt mode parameters (example)
25 4.7.5 Voltage related reactive power response
Figure 10 – Typical volt-watt response curve
Table 4 – volt-var response set-point values for reference voltages (example)
26 4.7.6 Additional reactive current requirements on generating plants
Figure 11 – Typical volt-var response curve
29 Figure 12 – Principle of voltage support during faults and voltage steps(DBL: lower deadband limit; DBH: higher deadband limit)
30 Figure 13 – Accuracy requirement for additional reactive current in positive and negative sequence
31 4.8 EMC and power quality
4.8.1 General
4.8.2 Direct current (DC) injection
4.9 Interface protection
4.9.1 General
32 Table 5 – Interface protection functions
33 4.9.2 Requirements on voltage and frequency protection
34 4.9.3 Means to detect islanding situation
Figure 14 – Operation of protection functions
35 4.9.4 Digital input to the interface protection
4.10 Connection and starting to generate electrical power
4.10.1 General
4.10.2 Connection of synchronous-type generators
4.10.3 Autoreclose of distribution lines
4.11 Ceasing and reduction of active power on set point
36 4.12 Remote information exchange
4.12.1 General
4.12.2 Monitoring and control
4.12.3 Communication
37 4.13 Requirements regarding single fault tolerance of interface protection system and interface switch
5 Conformance tests
38 Annex A (normative)Operating frequency range
Table A.1 – Continuous operating frequency range
Table A.2 – Limited operating frequency range
39 Annex B (normative)Operating voltage range
Table B.1 – Continuous operating POC voltage range
Table B.2 – Limited operating voltage range
40 Annex C (normative)Undervoltage ride through capability of DER
Table C.1 – UVRT capability of DER with an interface tothe grid based on a synchronous generator
Table C.2 – UVRT capability of DER with an interface to the grid basedon non-synchronous generators (e.g. converters, DFIG, etc.)
41 Annex D (normative)Overvoltage ride through parameters
Table D.1 – OVRT capability of DER
42 Annex E (informative)Reactive power control behaviour of DC to AC power conversion equipment used in DER in conjunction with synchronous generators
E.1 Background
E.2 Power system with DER configuration
E.3 Reactive power directions with leading/lagging of current phase angle to voltage phase
Figure E.1 – Configuration schematic of a power system
43 E.4 Reactive power control of synchronous generators
44 E.5 Reactive power control of power conversion equipment
E.6 Reactive power effect as reactive and capacitive load
Figure E.2 – Reactive and active power control imageof synchronous generators and DER
45 E.7 Conclusion
Table E.1 – Operation and behaviours of synchronous generators,dispersed loads and DER
46 Annex F (normative)Summary of power thresholds to be defined by individual countries
47 Bibliography

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BSI PD IEC TS 62786-1:2023
$189.07