smart meter
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Hi, this our Smart Meter project, Let’s start explaining it, starting from the left Here we have a DC fixed voltage power supply Simulating the main distributor power line We have also a resistor bank, simulating external users From this point starts local site boundary So, inside the local site we have a second resistor bank Simulating local appliances We have also another power supply, simulating a renewable plant For example a wind or a solar one And we have a power meter; we used a LTC2947 by Analog Devices Close to the entrance, we have also the main switch cabinet In this cabinet we imagine to have some local loads Simulated by these lights We have also a relays set, drived by a DE10-LITE board This board will send commands to the relays bank, to switch on/off local loads The power meter send every second the power info through a wired local link To this Bluetooth module That is connected to the main controller The main controller is a DE10-Nano board This Nano board receives power info through the Bluetooth link Perform some elaborations about these power measurements Display the system status via HDMI interface We can see on the top side of the screen the loads status A green block means load active A red block means load deactivated A blue block means load forced on We can see also Available and Used Power bars graph And Charging/Discharging battery ones We have also the battery status On this breadboard we can see two energy pumps They are led drivers, drived by an optocoupled interface They are able to pump energy from the main power line To the battery or vice-versa, from the battery to the main power line We have also a voltage divider Useful to simulate different battery power status Let’s start observing what happen when I change the amount of energy produced Or got from the main distributor We can see the bars graph growing We can ses the PWM signal increasing its duty cycle Let’s see what happen when I get more energy than I have Now we can see that system is getting energy from the battery The system was switching off/on some loads We can see some loads switching off Switching on/off according to energy produced at the same time As energy is varying randomly as doing now The system will react by activating/deactivating loads autonomously And pumping energy from the battery to the main distribution line As soon as energy will be needed We can see pumping energy from the battery to the distribution line Also on the scope Here we can see the discharging PWM signal that will disappear as soon as energy will be enough This way of functioning is automatic But can monitored and controlled by HPS that at present is disabled The system will run autonomously, switch on/off loads according to The istant power measure, but Anytime local users can, using for example a normal IR remote controller Force on some loads For example no. 2, no 5 Doing so, these loads will remain on regardless of power level The system will avoid to turn off these loads At the same time, users can use for example An Android App, available free of charge, configured to send messages At the present through a Bluetooth link, but It is possible to send messages through a GSM link or whatever else By Using this App users can, for example, force on/off the same loads So users can do this control remotely, outside home The system will act accordingly This is the AC meter connected to AC backbone and interfaced to the DE10Nano board through a MODBUS/LVTTL adapter We have also two AC lights, used as variable loads The scope shows in real time the MODBUS handshake, on the left the request, on the right the answer The laptop is connected, through the Nano UART to USB interface, to the linux kernel on the board. A terminal allows to launch the HPS application If I turn on one light, the used power bar graph increases When I turn on the second light, the overall used power increases more And when the HPS application starts Bar graphs indicators change randomly Together with loads on/off status, as HPS is simulating a random power received/donated from/to other sites

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