Thescenario is based on a small on-grid Solar PV system without DC energy
In order to realize zero export, we need energy meter with bidirectional metering function installed on Grids Side [Need to monitor the girds’ overall 3-phase incoming circuit so that we can monitorthe total power consumption supplied from grids to house loads and also monitor the over- generatedreflux/export energy from Solar PV to grids or power transformer.]
Selectedmodel here was just for example, all energy meter with RS485 (MODBUS-RTU) refer in section 4 has the ability to integrate inverter based on RS485 (MODBUS-RTU) to realize Zero Export control
Supposegrids sides incomming circuits is with rated current of 600A AC and rated voltage of 230Vac L-N&400Vac L-N.
DevicesDeploymentPlan
GridsSide–Grids’Overall3-phaseIncomingCircuit:– 1* ACR10RH-D110RE4 3-phase Rogowski Coil Energy Meter
Whenthe solar PV generated power wasn’t enough for house loads to Grids will also distribute power to house load for consuming. So, in this situation, the house load total power consumption was consisted of 2 parts, solar PV generated power and grids distribution power.
Girdspower flow to house load for consuming was normally calculated as “forward active energy, EPI” and “postive active power, +kw” by #1 ACR10R energy meter.
Whenthe solar PV generated power was larger than house loads power The part of over-generated solar PV power will reflux/export to power transformer or grids. In this situation, solar PV power generation will be distributed to 2 part, to house loads and to power transformer or girds.(2) Solar PV over-generated power which reflux/export to power transformer or girds was normally calculated as “backward active energy, EPE” and “negative active power, -kw” by #1 ACR10R energy meter.
