Difference of Grid Code for PV Inverter in Thailand and Others

By comparison Metropolitan Electricity Authority (MEA) and the Provincial Electricity Authority (PEA) grid code with others, the deviations are following (1) Harmonic: MEA refers the IEEE1547.1 unless THDi calculates follow IEC definition. PEA requires voltage harmonic results. (2) Active Power Control: PEA requires each reachingtime of reducing 10% of nominal output power (Pn) results (3) Reactive Power Control: PEA specifies for low voltage connected system and medium voltage connected system. The first one requires only a Fix Displacement Factor Cosθ capability. Other requires for 2 of capabilities namely, a Fix Displacement Factor Cosθ and a Variable Reactive Power Depending on Voltage Q(U). (4) Low Voltage Fault Ride Through: PEA requires the test results of fault conditions as followed. Three-phase symmetry, Phase-to-phase without ground and single phase to ground which is performed at 10%, 30% and more than 90% of nominal power condition as well. (5) Over/Under Voltage: MEA’s test procedure specified the final value at ±1V of trip voltage setting. Several differences of grid code effect to setting and capability of PV grid-connected inverter.