## 3 The Case of the Southern District of Texas
### SCADA Data Analysis  
The SCADA system for site B reports all the predefined information. In this work the focus was on the data which provide information about hydraulic leakage failures from the pitch cylinders which causes the turbines to shut down. Two sets of data have been provided in a form of excel sheet:  
* Data Report 1: this report includes a 4-month period, between 1 January 2018 and 30 April 2018. In this document, all the types of error codes were listed for all more than hundred turbines from the site. * Data Report 2: this report was a whole year report, starting from 1 January 2017 and ending on 31 December 2017. The document includes only three selected turbines, which showed outstanding results with the total number of failures within the period of the first report. In this second data report, only one type of code is available, which shows the hydraulic failure. The relevant date headers are  
* Turbine ID
* Time From
* Duration
* Event code
* Event text
* Low kWh  
In order to calculate the value of the lost kWh during the production, the market value of the electricity has to be investigated. The price fluctuates many times during the day. ERCOT makes it possible to publicly access to the Selling Point Price (SPP). This online database is refreshed every 15 min. The wind site B is connected to the interconnected electrical system managed by Electric Reliability Council of Texas (ERCOT) [25]. ERCOT facilitates the markets, provides timely information relevant to the operation of the markets and ensures transmission systems reliability. Furthermore, process outage and Network Model requests and coordinates transmission system planning. Location Marginal Pricing (LMP) is the cost to serve the next increment of Load at an Electrical Bus. At the Day Ahead Market (DAM) LMPs and Settlement Point Prices are calculated every hour, however in the Real-Time operations LMPs are calculated every 5 min and Settlement Point Prices (SPP) are calculated every 15 min. There are three types of Settlement Points: Resource nodes, Load Zones and Hubs. An electrical bus and the resources define the resource node. Here the resource's measured output is settled. A group of Electrical buses makes a Load zone. There are four competitive load zones and four regional Hubs, North, South, West, and Houston. The last SPP type is a Hub. Each Hub is a group of Hub buses (345 kV). In Texas, the installed wind capacity is 22,799 MW. Texas has a diverse portfolio. The mix has wind, gas, coal, nuclear and combine sum of 1% by solar, hydro and biomass. The total annual supply in 2017 was 358 TWh. Wind Energy provided 17.4% of this value. ERCOT is providing different type of data sets, which are available for the public on the ERCOT's homepage. The Hub Prices for the southern Texas were collected for the period, which were relevant for the SCADA data report 1 and report 2. The 2017 data were available for every 15 min. To reduce the amount of data the \(4\times 15\) periods were averaged and consolidated into hourly price information. The Process is relevant for the study to identify the root cause of the problem and obtain a clear picture of the 'As-is' situation. A series of tools will be used to determine the root cause. Once the problem is identified, solutions are created to meet the customer demands. The main question to be answered is: \"How to optimize the hydraulic systems processes in to lower the global costs\". The SCADA data were analyzed from the wind farm B in southern Texas. Initially the dataset for the whole turbine part with all the codes were requested. However, the size of the data was so big, that the exporting procedure would occupy their server for more than a day. This had to be avoided in order to keep the wind site running. To reduce the data exporting time constraint were defined. In the first data export, a 4-month period was investigated with all the turbines and error messages.