Transmission Problem Areas. Bulk power transfer over long distances Transmission Limitations/Bottlenecks have one or more of the following:
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1 Transmission Problem Areas Bulk power transfer over long distances Transmission Limitations/Bottlenecks have one or more of the following:» Steady-state stability limits» Transient stability limits» Power system oscillation limits» Inadvertent flows» Short circuit current limits» Thermal limits Introduction 1 Deregulated Structure Combined with Renewables Results in:» Increased variability in network condition» Uncontrolled variable generation output Needs» Better utilization of existing infrastructure» Robust, resilient solutions Introduction 2 1
2 Distribution Problem Areas Usually fall under power (voltage) quality:» Voltage sags due to faults, motor starting» Voltage flicker» Interruptions» Harmonics Introduction 3 Traditional Solutions Reactive compensation (distribution)» Shunt capacitors/reactors» Synchronous condensers» Passive harmonic filters Reactive compensation (transmission)» Shunt compensation (capacitors, synchronous condensers)» Series capacitors (SSR issues in some cases) Introduction 4 2
3 Traditional Solutions Transmission system fixes» Automatic Generation Control» Excitation control/power System Stabilizers» Phase shifting transformers» Faster protection (trip/reclose)» Operational limits» Reconductor lines» Increase voltage levels» Build more lines» Special stability controls Introduction 5 Power Electronic? Specialized applications where traditional technologies inadequate Apply where power converters matter» Fast, dynamic compensation is needed Avoid steady-state AC compensation» Conversion ac/dc or between frequencies For transmission Due to nature of generation or energy storage Introduction 6 3
4 Power Electronics to Change (Improve) Performance Classes of devices» Variable impedance ac compensators» Switching converter based compensators Effectively controlled voltage source Or controlled current source» HVDC: ac/dc conversion and power transfer Introduction 7 Power Electronics to Change (Improve) Performance Concerns:»Cost» Losses» Complexity» Reliability» Maintainability Introduction 8 4
5 Early Transmission HVDC Transmission» Update to Edison s vision» Asynchronous connections» Long distances overhead» Generally 2 terminal lines (evolving)» Underwater» Back to back» Drawbacks: Cost, complexity Introduction 9 Transmission HVDC Transmission History» Berlin-Charlottenburg early 1940 s» Moscow (USSR) early 1950 s» Gotland Island (Sweden) 1954 first operational» Current source converters (Mercury arc valves)» Thyristors in 1970 s» Growth in voltage sourced converter HVDC Introduction 10 5
6 Transmission Static VAr Compensators» 1: Reactive compensator--faster response» 2: Started with saturated reactors in 1930 s developed in Germany, Dr. E. Friedlander Still used in 1960 s» 3: First thyristor based devices in 1970 s» 4: Used at transmission and distribution level Introduction 11 Transmission Flexible AC Transmission Systems (FACTS)» 1: Shunt compensation» 2: Series compensation» 3: Phase angle regulator» 4: Combined #1, #2, and #3» 5: Speed of response» 6: Enhanced capabilities» Drawbacks: Cost, complexity Introduction 12 6
7 Transmission FACTS better when:» Dynamic control is needed, especially for V or Q» Cost and performance advantage over conventional solutions HVDC better when:» Need controlled P» Asynchronous or weakly tied systems» Right of way limitations» Long underground/underwater Introduction 13 Distribution Custom Power Devices» 1: Conventional static VAR compensators» 2: Distribution STATCOM (Shunt)» 3: Dynamic Voltage Restorer (Series)» 4: Static Transfer Switches» 5: Fault Current Limiters (current limiting fuses, power converters, superconductors)» Drawbacks: Cost, ratings, stop gap solution Introduction 14 7
8 Energy Storage (D or T level)» 1: Batteries» 2: Flywheels» 3: Superconducting magnets» 4: Flow batteries» 5: Pumped hydro» 6. Compressed Air» 7. Advanced Capacitors» Drawbacks: Power conversion often essential Introduction 15 Other Generation» 1: Diesel generators» 2: Small gas turbines» 3: Wind» 4: Photovoltaic» 5: Fuel cells» 6: Microturbines» Drawbacks: Interconnection, backup, no magic bullet Introduction 16 8
9 Other Power Electronic Transformers»AC/AC» DC/DC Introduction 17 9
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