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System Configuration
This complete set of STATCOM system mainly includes the following main equipments:
Interface Reactor/Converter Transformer
The interface reactor/converter transformer is used to connect the converter with the AC power networks, realizing the active power and reactive power exchange between the converter and the AC power networks.
Startup Equipment
To start the STATCOM system, the capacitor at DC side needs to be charged firstly. And for reducing the charging current and the impact on the system, the startup equipment is adopted in STATCOM system.
Power Valve
Power module, as the basic unit of STATCOM system, consists of IGBT and its drive circuit, supporting capacitor, radiator, equalizing resistance and so on. The power valves adopt H-bridge cascaded structure. Each phase consists of a number of power modules, adopting redundant design and satisfying “N-1” or “N-2” operational requirements.
Cooling System
Formation of enormous heat during operation may damage the components if it is not dissipated well. During low system capacity, PCS-9583 STATCOM adopts forced air cooling whereas during large system capacity, it adopts closed-loop water cooling with specialized control system.
STATCOM Control and Protection System
The STATCOM control and protection system consists of PCS-9583 PCP (Pole Control and Protection), PCS-9589 VBC (Valve base Control) unit, SMC (Sub-module controller), interposing relay set, network switch and other protection devices.
