Summary: The assignment aims at consolidating your knowledge base and developing practical skills to build a fuzzy system for forecasting the electricity price. The task is formulated as a time-series prediction problem for business application, and the goal is to model the behaviour of underlying dynamics of the electricity market. In principle, the merits of such a fuzzy forecasting system can be evaluated by two aspects:
- The number of fuzzy rules in the rule-base and the number of variables used in the antecedent part of the fuzzy rules (the smaller the better);
- System performance in terms of the accuracy (the smaller the better), i.e., the average relative error between your fuzzy system outputs and the actual outputs for both the training data set (learning capability) and the test data set (generalization capability).
This is an INDIVIDUAL assignment. You are NOT permitted to work as a group when completing this assignment. The length of the assignment report is about 750 words.
Problem Description (A Fuzzy System for Forecasting Electricity Price)
Develop a fuzzy forecasting system using Matlab Toolbox. The system performs a forecasting task for power marketing price. The data used in this assignment is from the real world (Queensland, Australia), and it has been split up into two parts, i.e., a training dataset which will be used to build your fuzzy forecasting system, and a testing dataset which will be used to evaluate your system performance in terms of generalization capability. The data sets can be downloaded from the Assignment directory in LMS.
Related Concept
Outliers: Roughly, an outlier is an observation that lies an abnormal distance from other values in a random sample from a population. You can read more about this concept via the links below:
https://www.itl.nist.gov/div898/handbook/prc/section1/prc16.htm
https://mathworld.wolfram.com/Outlier.html
System Inputs and Outputs
Let the temperature and total demand of electricity at time instant t be T(t) and D(t), respectively. The goal of the fuzzy forecasting system is to predict the RRP price by using some historical data as system inputs. In this assignment, the historical data set used for building the fuzzy system at time instant t is composed of a subset of the set M={T(t-2), T(t-1), T(t), D(t-2), D(t-1), D(t)}. The output of your system at time instant t is a forecasting value of the Recommended Retail Price (RRP) of electricity at the next time instant t+1, denoted by P(t+1).
Note that you should select a subset of the set M as the system's input variables by using correlation analysis.
Tasks Description (the maximum marks for each item below is 20)
- Remove outliers of the output variable from the datasets (both training and test), and give a list of the outliers; and then rebuild the training and the test datasets;
- Select appropriate values or fuzzy subsets for linguistic variables used in your fuzzy rules;
- List the fuzzy rules that are generated by using statistical analysis (correlation coefficients) with heuristics;
- Implement your fuzzy system using the Matlab Fuzzy Toolbox, where all membership functions involved in your system should be plotted clearly;
- Report your system performance in terms of the average relative error for both training and testing datasets, and analyze the effects of membership functions and defuzzification methods.
Remarks
- Assessment will be done by looking at the average relative prediction accuracy for both the training data set and the test data set.
- Either Mamdani-type or Sugeno-type fuzzy rules can be applied. The ANFIS tool will NOT be acceptable for carrying out this task.
- Your report should provide a commented list of the Matlab Commands used in your system with some graphical illustrations. It will be appreciated to show some fine-tuning of the system's parameters to produce sensible results. It is encouraged to appropriately use appendices to detail your results.
Attachment:- Assignment Data.rar