HOMER-Software-Training-Guide-.pdf

Defining the power system introduction 5 diesel price

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Defining the Power System Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources Define the power system design by clicking the Add/Remove button. Through the Add/Remove window you are able to select a number of different components including multiple loads, generators, battery banks, PV arrays and wind turbines and other power system components For this example place check marks besides Primary Load 1, Primary Load 2, PV,Wind Turbine 1, Converter, Generator 1 and Battery 1. At the bottom of the window select ‘do Not Model Grid’
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Step 3 Defining the Site Load Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources HOMER enables you to model two separate load profiles for a single site, these loads can be defined in different ways. A primary load could be used to model the BTS load and the other primary load could be used to outline the transmission & cooling). Alternatively the primary loads could define the power profile for the AC and DC equipment respectively.The hourly load profile of each load needs to be entered into primary load according to the setup defined in the schematic and model. It is possible to conduct the measurements remotely using an ammeter connected to a GPRS modem which which will transfer the collected data to the NOC (Network Operation Centre). An average power load profile can be defined, in case it is not possible to conduct specific measurements at the site, using data provided by equipment vendors. A BTS load profile depends on multiple parameters including configuration, temperature, transferred power, location, etc. therefore it is important to outline an accurate power profile in order to dimension correctly the renewable components for the system. Typical BTS power and voice/data traffic show a similar trend, in our example power consumption peaks occur in the late afternoon/evening hours – typically from 17.00 to 21.00, when the mobile traffic is more intense – while throughout the night there is a substantial decline in the site power requirement. HOMER determines the average daily consumption of the system based on the outlined power profiles. By introducing different values for the power scaled annual average it is possible to conduct a sensitivity analysis showing the effects of the overall performances influenced by the change in the average daily power consumption. This analysis could be particularly helpful in case we intend to verify the renewable performance indicators resulting from a BTS configuration upgrade.
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