1.  Introduction

The coursework for the ELEC402 – Power Systems Analysis and Dynamics module is worth 30% of the overall module grade. It has two parts:

.    The  first  part  (30%)  asks  you  to  build  a  13-bus  system  (single-line  diagram)  in PowerWorld Simulator and perform simple power flow and fault studies to analyse the network.

.    The second part (70%) asks you to integrate additional renewable generation into an existing network, without exceeding the constraints on the system.

In total, there are 4 tasks, with 2 tasks in first part and 2 tasks in second part.

After completing the coursework you should be able to:

1.   Use PowerWorld simulator to build networks, and conduct power flow analysis and fault studies.

2.   Explain the need for power flow analysis and system fault studies and the processes involved in completing them.

3.   Describe and explain how distributed generation affects the system loading, voltage levels and fault currents.

Note 1:    To complete the coursework you need to install PowerWorld simulator on your own

Windows  PC.  Files  and  installation  instructions  can  be  found  on  the  module’s CANVAS webspace.

Note 2:    Before attempting the Coursework it is advised to watch the PowerWorld simulator tutorials. These are available on the module’s CANVAS webspace.

Note 3:    Submission   of  the   Coursework  is  electronic,  through  CANVAS.  Submission

instructions and deadlines can be found on the module’s CANVAS webspace.

Note 4:    Avoid any form of plagiarism. Submissions will be checked with Turnitin.

2.  System Power Flow Analysis and Fault Study [30%]

For any power system, power flow calculations are essential since they provide the information required to optimise the  network  design,  determine the voltage  profiles  at  each  busbar, determine the required transformer tap settings, etc. Power flow calculations are usually the first  step  taken to  analyse  the  behaviour  of  a  power  system.  Fault  studies  are  also  of importance. They can inform power system equipment specifications such as the rating of circuit breakers.

Consider the distribution network Fig. 1. This network is mainly fed by a bulk supply point (BSP),  represented  by  the  Generator  connected  to  Busbar  1.  Additional  generators  are connected to the system for extra support.

2.1.  Task 1 [15 marks]

Notes:

1.   Download the Case file and Single Line Diagram file from CANVAS and complete the

network. The BSP and Bus1 are already provided.

2.   Bus1 is the System Slack Bus.

3.   Transmission lines have no MVA limits.

2.2.  Task 2 [15 marks]

3.  Distributed Generation Integration Study [70%]

Consider the distribution network, Area 1, shown in Fig. 2 (this is different to the network in Section2). Area 1 is connected to another network, Area 2, represented by the generator connected to Busbar 13. Electrical power can be exchanged between the two Areas. Due to government  incentives  and  subsidies,  the  system  operator  wants  to  integrate  as  much renewable generation as possible into Area 1. However, the network must still operate under its existing constraints. Hence, all voltages should be within ± 5% of nominal values, i.e. 0.95 – 1.05 p.u.,  and  the   power  system   equipment   (lines,  transformer)   should  not  be overloaded.

Although renewable generation is usually connected to the network using Power Electronic Converters (PECs) there is no requirement to model them in this study. Capacity limits for the lines and transformer have been included in the network model. Due to planning restrictions, Busbar 1 and Busbar 13 are not available for additional renewable generation integration.

3.1.  Task 3 [30 marks]

Notes:

1.   The Case file and Single Line Diagram file for the network inFig. 2 are available in CANVAS.

2.   Do not change any of the network parameters already provided in the source files.

3.   For simplicity, you can represent the three additional distributed generation sources as synchronous  generators  connected  to  the  chosen  busbars.  Make  sure  that  the “Available for AGC” and “Available for AVR” options for these generators are not active.

4.  Arriving at the optimal solution will involve trial and error. You will have to use your knowledge of power systems and try different combinations of locations and power outputs.

Table 6: Additional renewable generation