Saudi Arabian Grid Code May 2024

Black Start 4.4.7.1 In order to recover the Transmission System from a Partial or Total Shutdown, it is necessary to have certain Generating Stations (Black Start Stations) available which have the ability for at least one of their Generating Units to Start-Up from Shutdown and to Energize a part of the System, Synchronize to the System, and Energize dead bus, upon instruction from the TSP within two (2) hours, without an external electrical Power supply. 4.4.7.2 In order to maintain Security on the Transmission System at all times, Black Start Stations are required to comply with the provisions of this subsection. 4.4.7.3 The Generating Units agreeing to provide Black Start capability must provide frequency and voltage within the prescribed limits during line Energization and remote load pick up. 4.4.7.4 The TSP shall verify the actual performance of Black Start capability in the event actual system Blackout conditions occur. 4.4.7.5 Generators providing Black Start capability will also be required to provide voice and communication facilities linked with the TSP and capable of Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 operating without an external AC Power supply for the period as specified by the TSP in the relevant agreement. 4.4.7.6 Requirements of Black Start Stations Other than as permitted in accordance with (ii) below: (i) During a Black Start situation, instructions relating to Black Start Stations will be in the format required for instructions to Generating Units in Chapter 5: Scheduling and Dispatch Code, and will recognize any differing Black Start operational capabilities (however termed) set out in the relevant System Services Agreement in preference to the Declared operational capability as registered pursuant to Chapter 5: Scheduling and Dispatch Code. For the purposes of these instructions, the Black Start will be an emergency circumstance. For Generating Units which are not Black Start Units, Dispatch Instructions will recognize each Unit's Declared operational capability as registered pursuant to Chapter 5: Scheduling and Dispatch Code. (ii) If during the Demand restoration process, any Black Start Unit cannot, because of the Demand being experienced, keep within its safe operating parameters, the Generator shall inform the TSP immediately. The TSP will, where possible, either instruct Demand to be altered or will re-configure the Transmission System or will instruct a User to re-configure its System in order to alleviate the problem being experienced by the Generator. However, the TSP acknowledges that any decision to keep a Unit operating outside its safe operating parameters, is one for the Generator concerned alone to make and understands that the Generator may change Generation on that Unit if it believes that it is necessary for Safety reasons (whether relating to personnel, Plant, and/or Apparatus). If such a change is made without prior notice, then the Generator shall inform the TSP as soon as reasonably practical. (iii) The Generator shall report to the TSP all the required operational procedures to operate the Black Start Unit. 4.4.7.7 Minimum Requirements of BESS Black Start For BESS, the following should be provided as a minimum: Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 (i) The BESS facility should be capable to energize and control voltage & frequency at the Connection Point within its PQ curve; (ii) The BESS facility should be capable to withstand Load Switching Transients, while maintaining the frequency and the voltage within the statutory limits at the BESS terminals; (iii) The BESS facility should be capable to operate for a given time (duration) an amount of energy that relates to the load restoration. This duration and Power output will be agreed with the TSP; and (iv) The SoC should be maintained above a limit to ensure there is enough energy to fully execute a black start process, if designed to do so, during the agreed duration. Operational Liaison