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System Architecture
PCS-9700 is comprised of three or four levels in hierarchical structure: Station Level, Network Level, Bay Level and optional Process Level.
For substations
PCS-9700 can be widely applied to various substations.
For power plants
PCS-9700 can be applied as Electrical Control and Management System (ECMS) and Networked Control System (NCS) in various power plants.
Station level
In station level, PCS-9700 HMI system provides supervision, control and management functions for operators in the substation. The man-machine interface is friendly and easy to handle. The structure is flexible and capable of extension. Furthermore, the operation mode is reliable. By applying the component technology, “plug-and-play” can be realized for software functions.
Network level
In network level, PCS-9700 supports single/dual networks based on distributed or ring structures. Balance flow control is used for duplicated network, so the reliability and the real-time performance can be ensured. By adopting IEC standard communication protocols or other private protocols, PCS- 9700 can communicate smoothly with equipment produced by other manufacturers.
Bay level
BCUs, protection relays, Disturbance Fault Recorders (DFR) and other IEDs locate in bay level. These devices can operate with long-term stability in severe environments, e.g.: high temperatures, high humidity or high electro-magnetic disturbance.
Process level (Optional)
In process level, fiber-optic network is adopted instead of conventional cable wiring. Therefore, workload is reduced, and substation operational period is extended.
For the process level of NR digital substation solution, Sampled Values (SV) and GOOSE are supported. Main components in process level are listed as below:
Electronic CT/VT (ECT/ECT) digitalizes the current/voltage signals and transmits them to various IEDs, e.g.: protection relays, BCUs, DFRs and etc.
Merging Unit (MU) gathers digitalized data from ECT/EVT and distributes them to various IEDs via the process bus or point-to-point optical fibers. Conventional CT/VT can also be connected to NR merging units.
Circuit Breaker Controller (CBC) acquires data from circuit breakers, and transmits then to various IEDs via process bus.
Local control panel realizes the local installation of IEDs.
Ethernet switches guarantees real-time data transmission in process bus.
