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Phần 18 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Mô hình đường dây Siêu cao áp HVDC trên Phần mềm PSSE)• HVDC Configurations• HVDC Static Characteristics • Equivalent HVDC Model in Load Flow• Complete HVDC Model in Load Flow
TRANSMISSION & DISTRIBUTION A Division of Global Power POWER SYSTEM STABILITY CALCULATION TRAINING D8 HVDC Si l ti P t 1 D ay 8 - HVDC Si mu l a ti on P ar t 1 November 26, 2013Prepared by: Mohamed El Chehaly eBook for You OUTLINE 2 OUTLINE • HVDC Configurations • HVDC Static Characteristics • Equivalent HVDC Model in Load Flo w CltHVDCMdliLdFl • C omp l e t e HVDC M o d e l i n L oa d Fl o w eBook for You 3 HVDC CONFIGURATIONS HVDC CONFIGURATIONS eBook for You Different Configurations 4 HVDC CONFIGURATIONS Different Configurations Monopolar configuration with ground return Monopolar configuration with metallic return Monopolar configuration with midpoint grounded Bipolar configuration with ground return Bipolar configuration with metallic return Back-to-back configuration eBook for You Mono p ola r Confi g uration with Ground 5 HVDC CONFIGURATIONS p g Return Simplest and least expensive systems Earth return gives low losses Source: ABB eBook for You Mono p ola r Confi g uration with Metallic 6 HVDC CONFIGURATIONS p g Return Used when earth return is not valid Also, back-up mode in bipolar transmission if earth return is not allowed and with one healthy pole Source: ABB eBook for You Mono p ola r Confi g uration with Mid p oint 7 HVDC CONFIGURATIONS p gp Grounded Economic alternative to monopolar system with metallic return Two conductors required if ground return current is not allowed Source: ABB eBook for You Bi p olar Confi g uration with Ground 8 HVDC CONFIGURATIONS pg Return Most common configuration with 12-pulse converters Balanced operation gives zero earth current and low transmission losses Source: ABB eBook for You Bi p olar Confi g uration with Metallic 9 HVDC CONFIGURATIONS pg Return More expensive than previous solution Case if no earth return is possible Balanced o p eration g ives zero earth pg current and low transmission losses Source: ABB eBook for You Back to Back Configuration 10 HVDC CONFIGURATIONS Back - to - Back Configuration Used for interconnection of asynchronous networks No transmission line is necessary Two converter stations in the same geographical location Source: ABB eBook for You [...]... 15° 15 Gamma: 18 Commutating reactance: 0.13 pu g p eBook for You HVDC with the following specifications 32 EQUIVALENT HVDC MODEL IN LOAD FLOW Example 1: Four-Bus System Four Bus Simple representation of HVDC eBook for You Rectifier 33 EQUIVALENT HVDC MODEL IN LOAD FLOW Example 1: Four-Bus System Four Bus Simple representation of HVDC eBook for You Inverter 34 EQUIVALENT HVDC MODEL IN... 21 HVDC STATIC CHARACTERISTICS Reactive Power Characteristics eBook for You When DC power is increased, the reactive power consumed by the converters is increased as well Source: Alstom EQUIVALENT HVDC MODEL IN LOAD FLOW eBook for You 22 23 EQUIVALENT HVDC MODEL IN LOAD FLOW Short-Circuit Short Circuit Level Requirements S min SCR Pdc eBook for You For LCC HVDC, the system must be strong LCC -HVDC. .. 24 EQUIVALENT HVDC MODEL IN LOAD FLOW Short-Circuit Short Circuit Level Requirements eBook for You Strong system if SCR > 3.0 25 EQUIVALENT HVDC MODEL IN LOAD FLOW LCC -HVDC converters consume reactive power at both ends Reactive power requirements ≈ 50% of Prated Harmonic filters can provide between 50% and 100% of the required VARS eBook for You Reactive Power 26 EQUIVALENT HVDC MODEL IN LOAD... for You Simple Representation of HVDC in p p Load Flow 27 EQUIVALENT HVDC MODEL IN LOAD FLOW Simple Representation of HVDC in p p Load Flow Move the converter to another bus with a strong g short-circuit level Add synchronous condensers with high inertia to strengthen the bus Use Voltage-Source Converters (VSC) eBook for You If SCR . Characteristics • Equivalent HVDC Model in Load Flo w CltHVDCMdliLdFl • C omp l e t e HVDC M o d e l i n L oa d Fl o w eBook for You 3 HVDC CONFIGURATIONS HVDC CONFIGURATIONS eBook for. TRAINING D8 HVDC Si l ti P t 1 D ay 8 - HVDC Si mu l a ti on P ar t 1 November 26, 2013Prepared by: Mohamed El Chehaly eBook for You OUTLINE 2 OUTLINE • HVDC Configurations • HVDC Static. geographical location Source: ABB eBook for You 11 HVDC STATIC HVDC STATIC CHARACTERISTICS eBook for You Basic Rectifier Static Characteristics 12 HVDC STATIC CHARACTERISTICS Basic Rectifier