feat: Add documantation for OpenDSS node type

docs/node/nodes/opendss.md

@@ -0,0 +1,113 @@
+---
+hide_table_of_contents: true
+---
+
+# OpenDSS
+
+[OpenDSS](https://sourceforge.net/projects/electricdss/) is an electric power distribution system simulator (DSS) designed to support distributed energy resource (DER) grid integration and grid modernization.
+This node-type runs OpenDSS within VILLASnode and enables VILLASnode to exchange data with OpenDSS. 
+
+## Prerequisites
+
+This node-type requires OpenDSS shared library. 
+The documentation for compiling the library can be found in the [OpenDSS documentation](https://opendss.epri.com/OpenDSSC.html).
+Alternatively, the script found at `packaging/deps.sh` can be used. Please refer to the [installation document](../installation.md).
+
+## Implementation
+
+The Implementation of this node type is limited to only sending the data to set the values of certain element including:
+
+ - **Load:** Voltage(kV), Active Power(kW), Apparent Power(kVA), Power Factor(Pf)
+ - **Generator:** Voltage(kV), Active Power(kW), Apparent Power(kVA), Power Factor(Pf)
+ - **ISource:** Current(Amps), Phase angle(AngleDeg), Frequency(f)
+
+For the output, VILLASnode will read the data from a monitor element for each time step.
+The input and output data needed to be transported by [`path`](../config/paths.md) from/to other nodes.
+
+The source code of the node-type is available here:
+https://github.com/VILLASframework/node/blob/master/lib/nodes/opendss.cpp
+
+## Configuration {#config}
+
+For input data the name, element type and type of data are needed to be provived.
+However, for output data only the name of the monitor element is needed.
+
+import ApiSchema from '@theme/ApiSchema';
+
+<ApiSchema id="node" example pointer="#/components/schemas/opendss" />
+
+## Example
+
+``` url="external/node/etc/examples/nodes/opendss.conf" title="node/etc/examples/nodes/opendss.conf"
+nodes = {
+    opendss_node = {
+        type = "opendss"
+
+        # Path to OpenDSS file
+        file_path = "OpenDSS_file/sample.DSS"
+
+        # Example input configuration. Input data will be used to set Active power and power factor
+        # of load element name load1 and Active power of the generator element name gen1.
+        # Element name are deleared in OpenDSS file.
+        # Available input type and data:
+        #   - load:         kV, kW, kVA, Pf
+        #   - generator:    kV, kW, kVA, Pf
+        #   - isource:      Amps, AngleDeg, f
+        in = {
+            list = (
+                {name = "load1", type = "load", data = ("kW", "Pf")},
+                {name = "gen1", type = "generator", data = ("kW")}
+            )
+        }
+
+        # Example output configuration. Output data will be read from monitor name load1_power and load1_v.
+        # Monitor name are declared in OpenDSS file.
+        out = {
+            list = ["load1_power", "load1_v"]
+        }
+    }
+
+    udp_node = {
+        type = "socket"
+
+        layer = "udp"
+
+        format = "villas.human"
+
+        in = {
+            address = "*:12000"
+        }
+        out = {
+            address = "127.0.0.1:12001"
+        }
+    }
+
+    file_node1 = {
+        type = "file"
+
+        uri = "load.dat"
+
+        in = {
+            epoch_mode = "direct"
+            epoch = 10
+            rate = 2
+            buffer_size = 0
+        }
+    }
+}
+
+paths = (
+    {
+        # Get input for file node type
+        in = "file_node1"
+        out = "opendss_node"
+        hooks = ( { type = "print" } )
+    },
+    {
+        # Output to udp node type
+        in = "opendss_node"
+        out = "udp_node"
+        hooks = ( { type = "print" } )
+    }
+)
+```