Saudi Arabian Grid Code May 2024

Harmonic Distortion 2.4.4.1 All Plant and Apparatus connected to the Transmission System shall be capable of withstanding the levels of Harmonic distortion expected to be present on the Transmission System. 2.4.4.2 Plant and Apparatus connected to the Transmission System shall not impose voltage Harmonics on the Transmission System which exceed the limits specified in the relevant Connection Agreement, or when no such limits are specified there, a Total Harmonic Distortion of 1.5% with no individual Harmonic greater than 1%. 2.4.4.3 Plant and Apparatus connected to the Transmission System shall not impose current Harmonics on the Transmission System which exceed the limits specified in the relevant Connection Agreement, or when no such limits are specified there, the limits specified in IEEE Standard 519-1992: Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems. Chapter 2 - Connection Code The Saudi Arabian Grid Code Updated Version: May 2024 2.4.5 Voltage Unbalance The User facility shall not cause the phase-to-phase unbalance of the System, as measured with no load and with balanced three-phase loading, to exceed by more than one (1) % at the Connection Point. 2.4.6 Voltage Fluctuation and Flicker Severity 2.4.6.1 The voltage fluctuation at any Connection Point with a fluctuating Demand shall not exceed one (1)% of the nominal voltage level for step changes which may occur repetitively. Any large voltage excursions other than step changes may be allowed up to a level of three (3)% providing that this does not pose a risk to the Transmission System or to the System of any other User. 2.4.6.2 The Flicker Severity at any Connection Point in the Transmission shall not exceed the limits of Pst =0.8 and Plt=0.6, both 95th percentile values measured over a period of one week. 2.4.7 Transient Voltage Variations 2.4.7.1 The User Systems shall be designed and operated to include the devices that will mitigate the effects of transient over voltages and transient voltage dips on the Grid and the User System. 2.4.7.2 The User shall take into account the effect of electrical transients when specifying the insulation of their electrical Equipment. 2.4.8 Grounding 2.4.8.1 At voltages 110 kV and above, the Grid is effectively grounded with specified Ground Fault Factor below 1.4. 2.4.8.2 The TSP shall specify in the Connection Agreement the Grounding requirements and the applicable Ground Fault Factor at the Connection Points, if an exception is to be permitted in certain cases. 2.4.9 Phase Jumps The Inverter-Based Resource facilities must be designed to withstand transitory phase jumps at the Connection Point without disconnecting from the Grid and shutting down. The applicable control features must be available in the inverter to accommodate instantaneous phase jumps occurring at the Connection Point due to System disturbances and line-switching events. Chapter 2 - Connection Code The Saudi Arabian Grid Code Updated Version: May 2024 2.4.10 Short Circuit Ratio The lowest Short Circuit Ratio (SCR) at the point of Connection for which the Inverter-Based Resource facilities is to be Connected to (including its control systems) must be determined to ensure and maintain stability during operation based on the agreed minimum and maximum short circuit level during the Connection process. Thus, an SCR of not less than 3.0 should be maintained at the point of Connection. If the SCR falls below 3.0, detailed electromagnetic transient studies should be conducted to evaluate the Inverter-Based Resource facilities Connection and verify its compliance and its stable operation. Plant and Apparatus at Connection Points