7. Hydro power plant example
7.2. Application background
In the hydro power plant, the time stamping application displays and records the status changes of the turbine and the generator. Figure 11 shows the time stamping application process in hydro power plants:
Figure 11 Time stamping application in HPP system
A large hydro power plant requires high reliability and high performance. The Quantum platform with ERT mode is best choice for it.
Small and micro hydro power plants require flexibility and are cost sensitive. Premium or M340 platform with NTP or RTC is suitable for them.
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7.3. System architecture
The following is a detailed diagram of the system architecture of the time stamping solutions in the hydro power plant. In this STG, two kinds of time stamping solutions are offered: time stamped by program and time stamped by module.
Time stamped by module (ERT mode):
An example of a hardware system using the time stamped by module (ERT mode)
Figure 12 System architecture of time stamped by module
1. Clock reference acquisition
GPS receiver with the DCF 77 unit synchronizes the Quantum 140 ERT 854 10 module time clock.
2. Time stamped on the event data
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SCADA can be used to display the different applications with time stamping, such as SOE or digital alarms.Time stamped by program (NTP mode):
There are three parts to the system architecture, which include clock reference, input data with time stamping and monitor & data inquiry.
Figure 13 System architecture of time stamped by program
1. Time clock acquisition
A GPS receiver with the NTP server provides the NTP server clock for time stamping. 2. Time stamped on the event data
An M340 PAC with the input module generates the time stamping data. (FAST task should be set up to improve the time stamped accuracy.)
3. Monitoring & data inquiry
SCADA can be used to display the different applications with time stamping, such as SOE and time stamping alarms.
7.4. PAC application
A PAC program comprises the following main sections: turbine & generator start process, turbine & generator stop process, NTP stamping mode and ERT stamping mode. Two different stamping modes are used to tag the sequence events of the turbine and generator start and stop processes.
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The architecture of hydro power start and stop processes is programmed with the time stamping application as follows:Next are the details of the main sections:
y Turbine & generator start process section
The SFC programming language is selected to manage the start sequence of the related equipment in the hydro power plant, which includes H_Start1, H_Start2 and H_Start3.
y Turbine & generator stop process section
The SFC programming language is selected to manage the stop sequence of the related equipment in the hydro power plant, which includes H_Stop1, H_Stop2 and H_Stop3.
y NTP stamping mode section
Use this section to generate the time stamping with NTP clock. Meanwhile, users can manage the time stamping storage and send the time stamp to the SCADA system.
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Use this section to get the time stamping from the ERT module. Meanwhile, users can manage the time stamping storage and send the time stamp to the SCADA system.In order to set up the program easily, there are two methods to help users use the five DFBs in a hydro power control program.
Method1: Import the DFB (***.XDB file) from its directory, including TS_DataBase_To_VJC, TS_DataBase, TS_RTC, TS_NTP and TS_ERT. Users can follow the STG implementation in the PAC section to set up the time stamping application with the DFBs. See section 5.1.
Method2: import the sections (***.XBD file) from its directory. There are two sections for the time stamping, which include the TS_NTP_Mode.XBD, and
TS_ERT_Mode.XBD.
7.5. SCADA application
The hydro power time stamping application can be controlled and monitored with Vijeo Citect SCADA. Please refer to Chapter 5 regarding the application of the time stamping genies and alarms.
7.6. User operation
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y Hydro power main control system
y Stop status to generation status process
y Generation status process to stop status
y Time stamping database
The hydro power main control system includes the turbine and generator control monitor, oil supply system status monitor and water supply system status monitor:
Figure 14 HPP main control system
The turbine and generator from stop to generation status interface can monitor the sequence and status of equipment. D_TS genies are put beside the corresponding steps, and can display the signal text and the event time. RTC mode, NTP mode and ERT mode all can be used. This helps user to manage the work process.
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The turbine and generator emergency stop process interface can monitor thesequence and status of equipment. D_TS genies are put beside the corresponding steps, and can display the signal text and the event time. RTC mode, NTP mode and ERT modes all can be used. This provides the user with a way to manage the work process.
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7.7. Device list
The following chart shows the device list for the time stamped by module and time stamped by program methods:
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Appendix
Appendix
Abbreviations
CPU – Central Process Unit
DCF77 – Longwave time signal and standard-frequency radio station
DFB – Derived Function Block
ERT – Shortened name for the Quantum 140 ERT 854 10 module
GPS – Global positioning system
I/O –Input and output
NTP – Network Time Protocol
PAC – Programmable Automation Controller
RTC –Real Time Clock
SCADA – Supervisory Control and Data Acquisition
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Due to evolution of standards and equipment, characteristics indicated in texts and images in this document are binding only after confirmation by our departments
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