for a relatively long time. Voltage sag to 90% of normal voltage can happened in real life when system outages occur. Voltage drops to 75% will put single phase motor load at the edge of stalling. Figure XXX shows the voltage events; Figure XXX shows the results for the voltage ramp test while Figure XXX shows the results for the sag test. Notice the relative match in performance for overall active and reactive power (Pload, Qload) as well as Motor B performance. Figure XXX: Voltage Ramp and Voltage Sag Figure XXX: Benchmarking Software Platforms for Voltage Ramp Event Figure XXX: Benchmarking Software Platforms for Voltage Sag Different load compositions can result in different response to the variation of system frequency and voltage. This is fundamentally due to the changing dynamic load characteristics as the load composition changes. Below is an example of different load models tested. All Load Components Present, 1 Implementation (no stalling) All Components Present, Phase 2 Implementation (stalling) 100% Motor A 3-Phase Compressor Motor – 100% Motor B 3-Phase Fan Motor – 100% Motor D 1-Phase Compressor Motor, Phase 1 – 100% Motor D 1-Phase Compressor Motor, Phase 2 – Voltage, frequency, motor speed, torques, active and reactive power are generally useful variables to compare, but more detail variables monitored will explore more detailed issues internal to the software calculations, and will help to resolve issues working with the vendor. Below are some variables monitored in the benchmarking analysis between software platforms. High side bus voltage magnitude Motor C: Real power Low side bus voltage magnitude Motor C: Reactive power Load bus voltage magnitude Motor C: Trip-reclose factor Load Total real power Motor C: Speed – Load reactive power C: Electrical Torque – Transformer Tap Position Motor D: Real power A: Real power Motor D: Reactive power Motor A: Reactive power Motor D: Fraction of motors not tripped by Motor A: Trip-reclose factor U/V relay Motor A: Speed Motor D: KthA non-restartable compressor Motor A: Electrical torque motor A fraction not tripped by thermal Motor B: Real power protection Motor B: Reactive power Static load real part Motor B: Trip-reclose factor Static load reactive part Motor B: Speed Electronic load real part Motor B: Electrical Torque Electronic load reactive part
for a relatively long time. Voltage sag to 90% of normal voltage can happened in real life when system outages occur. Voltage drops to 75% will put single phase motor load at the edge of stalling. Figure XXX shows the voltage events; Figure XXX shows the results for the voltage ramp test while Figure XXX shows the results for the sag test. Notice the relative match in performance for overall active and reactive power (Pload, Qload) as well as Motor B performance. Figure XXX: Voltage Ramp and Voltage Sag Figure XXX: Benchmarking Software Platforms for Voltage Ramp Event Figure XXX: Benchmarking Software Platforms for Voltage Sag Different load compositions can result in different response to the variation of system frequency and voltage. This is fundamentally due to the changing dynamic load characteristics as the load composition changes. Below is an example of different load models tested. All Load Components Present, 1 Implementation (no stalling) All Components Present, Phase 2 Implementation (stalling) 100% Motor A – 3-Phase Compressor Motor 100% Motor B – 3-Phase Fan Motor 100% Motor D – 1-Phase Compressor Motor, Phase 1 100% Motor D – 1-Phase Compressor Motor, Phase 2 Voltage, frequency, motor speed, torques, active and reactive power are generally useful variables to compare, but more detail variables monitored will explore more detailed issues internal to the software calculations, and will help to resolve issues working with the vendor. Below are some variables monitored in the benchmarking analysis between software platforms. High side bus voltage magnitude Low side bus voltage magnitude Load bus voltage magnitude Load – Total real power Load – reactive power Transformer Tap Position A: Real power Motor A: Reactive power Motor A: Trip-reclose factor Motor A: Speed Motor A: Electrical torque Motor B: Real power Motor B: Reactive power Motor B: Trip-reclose factor Motor B: Speed Motor B: Electrical Torque Motor C: Real power Motor C: Reactive power Motor C: Trip-reclose factor Motor C: Speed C: Electrical Torque Motor D: Real power Motor D: Reactive power Motor D: Fraction of motors not tripped by U/V relay Motor D: KthA non-restartable compressor motor A fraction not tripped by thermal protection Static load real part Static load reactive part Electronic load real part Electronic load reactive part