Prospects of the new SVC with modular Multilevel Voltage Source Converter
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1 SB4 Colloquium 2011 Prospects of the new SVC with modular Multilevel Voltage Source Converter Marcos Pereira Martin Pieschel Ralf Stoeber Brisbane Australia, October 2011 Siemens AG 2011 Energy Sector
2 FACTS devices: line-commutated vs. self-commutated converters SVC Classic SVC SVC PLUS Example: Advanced STATCOM - Compactness - Short Response Time - Controllability Page 1
3 FACTS devices: line-commutated vs. self-commutated converters UNET= UVSC + ULc SVC SVC PLUS QNET= UNET. (- j. ILc) QNET= UNET. UVSC - UNET ω. Lc Example: UNET UVSC ULc ILc ILc Advanced STATCOM - Compactness UNET UVSC - Short Response time - Controllability Page 2
4 Transmission level voltage applications: two-level and multilevel converters P L1 L2 L3 Filters required for wave form construction and harmonics elimination. Two level converter with series connected switches N High switching frequency Sharp voltage steps Measures required for uniform voltage sharing (snubbers) Neutral point diode-clamped three-level converter Special gate drives required to compensate switching time tolerances Page 3
5 The SVC PLUS uses Modular Multilevel Converter (MMC) MMC with cascaded H-bridges and isolated capacitors Very clean voltage wave form...with and modest limited switching voltage steps frequency v v Page 4
6 The SVC PLUS uses Modular Multilevel Converter (MMC) MMC with cascaded H-bridges and isolated capacitors Very clean voltage wave form...with modest switching frequency + switches optimized for low conduction losses = reduction in total losses High controllability, fast response Modularity, equal loading of modules Page 5
7 Modular Multilevel Converter (MMC) High performance Step in the output order Page 6
8 Modular Multilevel Converter (MMC) High performance HV-side single-phase short-circuit Page 7
9 SVC PLUS as containerized solution. Picture: Kikiwa, New Zeeland, 2 x M (±35 Mvar) First two units: Thanet, UK, end years later: 34 units under project execution / commercial operation Page 8
10 SVC PLUS as containerized solution: equipment layout Page 9
11 SVC PLUS allows improved (combined) features and FACTS applications Voltage control, power system stability Flicker control (e.g. arc furnaces) Page 10
12 MMC allows new or improved (combined) features and FACTS applications Voltage control, power system stability Flicker control (e.g. arc furnaces) Page 11
13 MMC allows new or improved (combined) features and FACTS applications Voltage control, power system stability Flicker control (e.g. arc furnaces) Phase balance (e.g. railways) Grid access (e.g. wind farms) Page 12
14 Converter module: H-bridge with capacitor and protective bypassing device MMC Topology: Device capacitance distributed among the modules Very small inductance in the commutation path = fast commutation time, no snubbers needed = reduction in total losses Smaller capacitors = limited discharge energy in case of short-circuit in the capacitor or in the module Redundancy of defective module through bypass covers electronics and capacitor Page 13
15 Alternatives and expectations Example: DC/AC MMC converter in FACTS applications Vision: MMC UPFC AC system Shunt reactive power compensation Load Energy Power flow balancing storage control Page 14
16 Conclusions: SVC PLUS is a MMC STATCOM. It was initially conceived for Grid Access, specially in connection with large off-shore wind parks. Extended application range for network voltage and stability support, HVDC reactive power dynamic control and power quality (flicker mitigation). Compact design, low losses, fast response and competitive costs due to MMC technology. Containerized standard solutions from ±25 Mvar up to ±200 Mvar with 4 x 50 Mvar parallel units and open-rack units. First 2 units commissioned in Meanwhile, 34 units under project execution / commercial operation. New developments for FACTS using MMC technology are expected to come on in the next time. Page 15
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