POLICIES AND PROCEDURES ENGINEERING SERVICES DEPARTMENT

Transcription

1 POLICIES AND PROCEDURES ENGINEERING SERVICES DEPARTMENT

2 VOLTA RIVER AUTHORITY System Planning Engineering Services Department

3 [ENGINEERING SERVICES DEPARTMENT] POLICIES INTRODUCTION A. IDENTIFICATION DATA Policy No. ESD/002 Document ID: SYSTEM PLANNING SECTION i. Subject: VRA Hydro and Thermal Power Generation Systems Planning ii. Subject Area: VRA HYDRO AND THERMAL POWER GENERATING PLANTS iii. Functional Responsibility: Director, Engineering / Manager, Systems Planning iv. Approval Date: [Date of Policy is Approved] B. BROAD DIRECTIVE PRINCIPLES i. POLICY STATEMENT: Plan the expansion and reinforcement of VRA s power system to meet projected electricity demands in a least-cost and effective manner whilst adhering to predetermined adequacy and system performance criteria ii. POLICY RATIONALE/OBJECTIVES: Conduct regular reviews of electricity consumption and develop projections and forecasts of electricity consumption Prepare annually and update regularly, generation system operating plans including inflow forecasting and reservoir management for the Authority s hydroelectric reservoirs and fuel requirements for the Authority s Thermal Power Stations so as to optimize the operation of the generation system Develop a least-cost supply plan for VRA to ensure that adequate supply of electricity resources is available to meet electricity demand in the country and agreed supply to interconnected utilities. Carry out operating studies in a continuous manner for the transmission system to determine optimal operations from the perspective of voltage control, safe interchange limits and technical losses so as to optimize the operation of the transmission system network

4 Determine the optimum operating conditions from the perspective of voltage stability limits, dynamic stability limits and technical losses. Develop least cost plans for the expansion and reinforcement of the electricity grid in the country. iii. SCOPE OF APPLICATION: All VRA Dams and Power generating plants C. IMPLEMENTATION PROCEDURES: ESD/002/002 LOAD FORECAST Update available database of electricity consumption pattern for the different categories of customers Carry out a survey of electricity customers to determine their future electricity requirements and consumption drivers Determine macroeconomic parameters such as GDP growth, inflation, population growth rate etc. which impact on electricity consumption Use the above as inputs for forecasting of future electricity requirement and the corresponding annual growth rates for a period of 10 years. Carry out the outlined process on a yearly basis to ensure new developments are always captured in the projections of future power requirement INFLOW FORECAST Update available rainfall and inflow database of the various rainfall and stream flow stations that impact on the volume of water in the Akosombo reservoir. Use the above as data inputs into an inflow forecasting model, that forecasts expected inflows into the Akosombo Reservoir during the flood season.

5 Produce regular and frequent forecasts covering long term and short term periods ENERGY SUPPLY PLAN Obtain maintenance schedules and availability factors of all the generating plants to know when and what amount of power will be available from each of the generating plants Knowing the energy requirements from the load forecast and the expected inflows, the amount of energy that can be produced from the hydro resources can be determined The transmission system capability with minimal losses is also determined to ensure optimum operation of the transmission network. Based on the above and the financial capability of the Authority, a least cost energy supply plan is developed for VRA taking into consideration the minimum elevation of the Akosombo reservoir that can be attained in order to ensure that supply reliability for the subsequent years is not jeopardized and also the maximum amount of fuel that can be purchased for the thermal plants. Update the energy supply plan on a regular basis to reflect variations or otherwise that may arise in the course of the year. D. IMPLEMENTATION, ENFORCEMENT, AND MONITORING RESPONSIBILITY: Director, ESD/Manager, System Planning E. SPECIFIC CIRCUMSTANCES: Force majeure, cashflow difficulty F. Definitions: N/A Related policies/references: [Information about related policy guidelines. Attach forms samples if applicable to the policy. If needed additional background discussion should be provided]

6 ENGINEERING DEPARTMENT POLICIES Owner Engineering Services Department Approved By: Signature : Effective Date: Origination Date: Revision Date: Version No:

7 ENGINEERING SERVICES DEPARTMNET PROCEDURES INTRODUCTION G. IDENTIFICATION DATA Procedure No. : ESD002/002 Document ID: System Planning i. Subject: VRA Hydro and Thermal Power Generation Systems Planning ii. Subject Area: VRA HYDRO AND THERMAL POWER GENERATING PLANTS iii. Functional Responsibility: Director, Engineering / Manager, Systems Planning iv. Approval Date: [Date of Procedure is Approved] H. OVERVIEW/PROCEDURE DESCRIPTION i. PROCEDURE OBJECTIVES: To ensure effective Load Forecast, Inflow Forecast and Energy Supply Plan I. PROCEDURE DETAILS: LOAD FORECAST Update available database of electricity consumption pattern for the different categories of customers Carry out a survey of electricity customers to determine their future electricity requirements and consumption drivers

8 Determine macroeconomic parameters such as GDP growth, inflation, population growth rate etc. which impact on electricity consumption Use the above as inputs for forecasting of future electricity requirement and the corresponding annual growth rates for a period of 10 years. Carry out the outlined process on a yearly basis to ensure new developments are always captured in the projections of future power requirement INFLOW FORECAST Update available rainfall and inflow database of the various rainfall and stream flow stations that impact on the volume of water in the Akosombo reservoir. Use the above as data inputs into an inflow forecasting model, that forecasts expected inflows into the Akosombo Reservoir during the flood season. Produce regular and frequent forecasts covering long term and short term periods ENERGY SUPPLY PLAN Obtain maintenance schedules and availability factors of all the generating plants to know when and what amount of power will be available from each of the generating plants Knowing the energy requirements from the load forecast and the expected inflows, the amount of energy that can be produced from the hydro resources can be determined The transmission system capability with minimal losses is also determined to ensure optimum operation of the transmission network. Based on the above and the financial capability of the Authority, a least cost energy supply plan is developed for VRA taking into consideration the minimum

9 elevation of the Akosombo reservoir that can be attained in order to ensure that supply reliability for the subsequent years is not jeopardized and also the maximum amount of fuel that can be purchased for the thermal plants. Update the energy supply plan on a regular basis to reflect variations or otherwise that may arise in the course of the year. J. IMPLEMENTATION, ENFORCEMENT AND MONITORING RESPONSIBILITY: Director, Engineering/Manager, System Planning K. SPECIFIC CIRCUMSTANCES: Force majeure, cashflow difficulty L. Definitions: N/A Related policies/references: [Information about related policies or procedures, guidelines. Attach forms samples if applicable to the procedure. If needed additional background discussion should be provided] ENGINEERING DEPARTMENT PROCEDURES Owner Approved By: Signature : Effective Date: Origination Date: Revision Date: Version No: