Saudi Arabian Grid Code May 2024

Maximum Output Power Reduction Diagram 2.5.5.3 The accuracy of frequency measurement for Frequency Regulation shall be +/- 10mHz or better. 2.5.5.4 All Synchronous Generating Units shall be capable of withstanding any Rate of Change of Frequency (RoCoF) up to 1Hz/s without disconnection from the network other than triggered by loss of mains protection. The Rate of Change of Frequency shall be measured over a sliding 500ms time period. All Power Park Modules shall be capable of withstanding any Rate of Change of Frequency up to 2.5Hz/s without disconnection from the network other than triggered by loss of mains protection. The Rate of Change of Frequency shall be measured over a sliding 500ms time period. 2.5.5.5 Each Power Park Module, which is not inherently capable of supplying additional Active Power to the network by its inertia and which has a Registered Capacity greater than twenty five (25) MW in aggregate, shall be capable of providing Synthetic Inertia through the supply of additional Active Power output to the network in order to limit the Rate of Change of Frequency following a sudden system unbalance. 2.5.5.6 For Inverter-Based Resource facilities, the SCR at its Connection Point should be > 3.0. If the SCR is < 3.0, the User shall conduct a detailed electromagnetic transient study to evaluate the PPM or BESS connection and verify its compliance and its stable operation. Chapter 2 - Connection Code The Saudi Arabian Grid Code Updated Version: May 2024 2.5.5.7 The Active Power output at the Generating Unit terminals under steady state conditions should not be affected by voltage changes in the normal operating range specified in (2.4.3). 2.5.5.8 Transformation ratio and the tap changer of the step up transformer and the auxiliary services transformer, the voltage range of the Generating Unit, the control capabilities and converter ratings of the Power Park Modules and Excitation of the Synchronous Generating Unit shall be designed and adjusted so that the Generating Unit is at normal operating voltage of the Grid, capable of producing or absorbing (as the case may be), continuously the Reactive Power defined by the capability curve of the Generating Unit (at Generating Unit voltage level). The Generating Unit’s continuous Reactive Power capability shall not be restrained by main or auxiliary Equipment, control, Protection, or operating procedures. 2.5.5.9 The Synchronous Generating Unit shall be capable of continuously absorbing the Reactive Power (under Excitation operation) defined by the capability curve of the Generating Unit also at maximum voltages (380, 230, 132, 115, and 110 kV of the Grid) assuming that Stability is maintained. 2.5.5.10 The Reactive Power output at the Generating Unit terminals under steady state conditions and at rated Active Power should be fully available within the range ± five (5)% of nominal voltage at the Connection Point. 2.5.5.11 The TSP may require a Black Start capability from certain strategically located Generating Units/Stations. In such cases, Generators will provide Black Start capability through an agreement with the TSP. If an agreement cannot be reached on this issue, the TSP or the Generator shall refer the matter to the Regulator for resolution. Generators, committing to provide Black Start capability, shall also allow to the TSP access to their Black Start Units for testing and drills, as and when required by the TSP. 2.5.5.12 In case the System frequency momentarily rises to 62.5 Hz or falls to