Concept
Grid code
- ID
concept:grid-code- IRI
https://solarlattice.org/kb/concept/grid-code- Status
- active
- Also known as
- interconnection standard, grid connection rules, grid protection rules, Grid Connection Rule
- Category
- Grid
- Concept kind
- technology
Early residential PV systems simply followed a healthy grid and shut down when voltage or frequency went outside acceptable limits. In some countries, utility-scale PV plants may no longer shut down when the grid is stressed. They must support the grid instead, including by producing reactive energy. On the inverter, the grid code is chosen as a setting, sometimes called the grid connection rule or country standard. That setting fixes parameters such as the connection time after a restart. Some inverters also have a dynamic grid support mode that can be set to off, limited or complete. The inverter's self-diagnostics and alarms help keep it in compliance with grid standards.
<!-- review notes
- sentence 3: support check: partial - Grid Connection Rule title, Country standard group and connection time after restart appear, but the passages don't explicitly say the setting fixes that parameter or equate the names.
- sentence 5: support check: partial - Passage says self-diagnostic mechanisms ensure safety, availability and compliance with grid standards, but does not specifically say alarms keep the inverter compliant.
-->
Claims
related_to
c1 verified · fact
Grid code setting
Inverters set the grid code through a setting: SMA documents a procedure for changing the grid code and groups parameters under a country standard, and Delta shows Grid Code screens.
verified by: review-workflowverified on: 2026-10-24review note: support check: partial - Passages show a Country standard parameter group, a 'Changing the Grid Code' section and Grid Code screens, implying a setting, but don't explicitly state grid code is a setting.
c2 drafted · lead
ENA EREC G99 proposed
UK G99 appears among the grid protection rules against which a vendor checks meter-based export limitation for compliance.
review note: support check: partial - UK G99 - ENA 100 appears in the export limitation compliance table, but the passages don't explicitly link it to the grid code concept.
c3 drafted · lead
VDE-AR-N 4105:2018 proposed
Appears as a grid protection rule in a vendor's export limitation compliance table.
c4 drafted · lead
Export limitation
Each meter is marked as compliant or not with each grid protection rule when used for export limitation.
c5 drafted · lead
IEEE 1547 proposed
NREL describes how the IEEE 1547 standards are used in the United States.
review note: support check: partial - The passage is only a figure caption on IEEE 1547 use in the US; it doesn't say NREL describes it, nor relate it to grid code.
c6 drafted · lead
Dynamic voltage support
SMA inverters offer a dynamic grid support mode that can be set to off, limited or complete.
c7 drafted · lead
Reactive power
In some countries, utility-scale PV plants must stay online when the grid is stressed and produce reactive energy to help stabilize it.
Referenced by
Data