November 27, 2014 | Bretislav Valek
The application was developed for the needs of EnServis. It is focused on solar power plants and its main purposes are monitoring, control, and data acquisition. Since the maintenance of the plants is a priority of the company, the service technician must be informed in real time of any potential problems.
The project is divided into 3 integral parts that ensure smooth operation.
Monitoring is provided exclusively by ELVAC devices. They are used to compare input parameters of individual tags. The service technician is informed of any deviation from the specified limits. VBScript allows programming all monitoring mechanisms using a script. Each week, a different service technician is responsible for maintenance works. For this reason, there is a function that allows searching for a service technician depending on the week. If a service technician is unable to do his/her job, another one can be chosen from the main menu. If a failure occurs, the service technician on duty is notified via an email message.
Parts of monitoring:
To control the plant, the service technician must be verified. This feature is not accessible to common users. The reason for that is the reduction of power production (e.g., due to service work). A script for automatically controlling the production process according to the plant's current output can be used if need be. This is, for example, due to power reduction when servicing a high-voltage transformer and replacing it with a lower-power one.
The monitoring of the plant only at its input is insufficient with respect to possible decentralized inverter failures. Therefore, the application accesses a DB file to acquire current information on the inverters' states. In case of the reduction of power production (e.g., due to a damaged panel or a faulty fuse), the system detects the failure and informs the service technician. The notification message is sent even if an entire inverter failure or other power production problems occur.
The application is accessible via the Internet using the Reliance SCADA/HMI system's thin clients – Reliance 4 Web Client and Reliance 4 Smart Client. Reliance Smart Client is mainly used by the service technician and always allows him/her to monitor the current situation. Reliance Web Client can be used either by other members of staff or by investors to check the operation of the plant.
An electric power plant
Power production states at the solar power plants
A trend of a solar power plant's output
A high-voltage trend
Try the Reliance SCADA/HMI system on several example projects or download the installer of the trial version for free.
Visualization and control of solar power plant control systems
10 x ELVAC RTU7M modular control system
9 x ELVAC RTU7K telemetry unit
1 x Reliance 4 Design Enterprise with 200 data points
1 x Reliance 4 Control Server with 200 data points
Reliance 4 Smart Client
Reliance 4 Web Client