Saudi Arabian Grid Code May 2024

Objectives The objectives of this section are: (i) to establish a policy to ensure Frequency Control capability in the Transmission System for operational control by the TSP, and to set out appropriate procedures to enable the TSP to control the Transmission System frequency and (insofar as possible) maintain it within the limits specified in Chapter 2: Connection Code; (ii) to set out control strategies to be used by the TSP, in conjunction with Users where appropriate, for controlling the Transmission System voltages; (iii) to describe the various time scales for which Operating Margins are required, the policy which will govern the Dispatch of the reserves, and the procedures for monitoring the performance of Generating Units and other reserve providers; and Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 (iv) to set out requirements relating to Black Start Stations to enable the TSP to recover the Transmission System from a Partial or Total Shutdown. 4.4.3 Frequency Control 4.4.3.1 The TSP will achieve Frequency Control through Primary Frequency Control and Secondary Frequency Control, as set out below: (i) Primary Frequency Control takes place in the period of up to thirty (30) seconds after a change in frequency and is achieved by automatic corrective measures to frequency deviations occurring on the Transmission System. Automatic Primary Frequency Control Actions in response to normal frequency fluctuations, within the levels specified in (2.4.2) on the Transmission System are also commonly termed as "Frequency Regulation". (ii) frequency deviations, outside the levels specified in (2.4.2) such as those that may occur on the loss of one or more Generating Unit(s), or other MW input into the Transmission System or the Distribution System are corrected through the use of Operating Reserve. (iii) Secondary Frequency Control takes place in the time scale from 30 seconds up to 10 minutes after the change in frequency. It is provided by a combination of automatic and manual actions. BESS Facilities connected to the Transmission System must be capable of Fast Frequency Response. Additional Active Power must be injected to the System in response to changes in measured frequency to improve the Frequency Nadir or initial Rate of Change of Frequency. The additional Power and the response time will be stated in the relevant System Services Agreement. The accuracy of the completed Fast Frequency Response must not deviate by more than 1% over a period of 1 minute. 4.4.3.2 Generation Speed Governor Systems of Synchronous Generating Units (i) To maintain Frequency Regulation capability in the Transmission System, Generators are required to comply with the provisions of this section at all times other than as permitted in exceptional circumstances as laid down in (v) below. Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 (ii) Generating Units when Synchronized with the Transmission System shall operate at all times under the control of a Speed Governor System, unless otherwise specified by the TSP, with characteristics within the appropriate ranges as specified in Chapter 2: Connection Code; (iii) No time delays other than those necessarily inherent in the design of the Speed Governor System shall be introduced; (iv) Governor Systems shall, as a minimum, be fully responsive to frequency deviations exceeding ±