Real-Time Hardware-in-the-Loop Testing of an Excitation Control System for Oscillation Damping using External Stabilizing Signals
0 likes945 views
This document discusses the real-time hardware-in-the-loop (RT-HIL) testing of an excitation control system (ECS) for damping oscillations using external stabilizing signals. It illustrates how external damping signals can be integrated into the ABB Unitrol 1020 ECS to enhance system performance, bypassing limitations of built-in algorithms. The study demonstrates that various power system stabilizer (PSS) models can provide adequate oscillation damping, enabling greater flexibility for users.
Real-Time Hardware-in-the-Loop Testing of an Excitation Control System for Oscillation Damping using External Stabilizing Signals
- 1. RT-HIL Testing of an Excitation Control System for Oscillation Damping using External Stabilizing Signals M. Shoaib Almas* and Dr. Luigi Vanfretti*~ *Electric Power Systems Division, KTH Royal Institute of Technology, Stockholm, Sweden, Email: {msalmas, luigiv}@kth.se ~R&D Department, Statnett SF, Oslo, Norway, Email: luigi.vanfretti@statnett.no Utilization of external damping signals in a commercial ECS enables to utilize any local or wide-area measurement to damp local or inter-area oscillation · Excitation Control System (ECS) provides direct current to the synchronous machine field winding in order to regulate the generator's terminal voltage. · ECS also have integrated PSS functionality that provides adequate damping to the power system when small or large disturbances may result in undamped oscillations in an interconnected power system. · Different vendors have implemented different PSS types in their ECS unit to provide power system oscillation damping. However, this restricts the end-user to rely on the built-in PSS algorithms and limited input signals for PSS. Primary and Supplementary Functions of an Excitation Control System ABB Unitrol 1020 Excitation Control System Test Case Modeling and Real-Time Hardware-in-the-Loop Setup Conclusion RT-HIL Assessment with External Damping Signals · The PSS feature available in Unitrol 1020 ECS is defined by the IEEE Std. 421.5-2005 PSS 2A/2B model. · The PSS2B has dual structures that use two signals of angular velocity "ω " and power "P" · In this study, external damping signals are provided from different PSS and POD algorithms (from Simulator) to the AVR of the ECS Frequency Calculation Power Calculation Terminal Voltage Stator Current UM IM Washout Filter Lead-Lag Compensator PSS Gain Washout Filter Power System Stabilizer (PSS) f V2 V1 Pe ΔVPSS To AVR of ECS External Damping Signals Built-in PSS: Type IEEE PSS 2B Klein-Rogers-Kundur's Power System showing only one Area. Only generator G1 is equipped with Unitrol 1020 ECS · Connection Diagram for interfacing Opal-RT with Unitrol 1020 ECS. · The output of PSS/POD models being executed in real- time in Opal-RT is fed to the ABB's Unitrol 1020 through its analog input configured for receiving external damping signals. 80 90 100 110 1.5 1.6 1.7 1.8 1.9 2 Rotor Field Current Input to Unitrol 1020 ECS Time (sec) FieldCurrent(pu) 80 90 100 110 0 1 2 3 4 Field Voltage Output from Unitrol 1020 ECS to Generator Time (sec) FieldVoltage(pu) 80 90 100 110 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 External Damping Signal Input to Unitrol 1020 ECS Time (sec) DampingSignal(pu) 80 90 100 110 400 450 500 550 Power Transfer from Area 1 to Area 2 Time (sec) Power(MW) No External PSS Signal MB-PSS External Signal dw-PSS External Signal dPa-PSS External Signal POD External Signal · RT-HIL results show that the external damping signals from different stabilizer models can be fed to the commercial ECS to provide adequate damping. · This liberates the users from the restriction of relying only on the built-in PSS implementation of the ECS. G2 Area 1 Local Loads 900 MVA 900 MVA 900 MVA 20 kV / 230 kV 25 Km10 Km 900 MVA 20 kV / 230 kV 967 MW 100 MVAR (Inductive) -387 MVAR (Capacitive) Bus1 Voltage Metering Mechanical Power (Pm) Pm Vfield G1 Rotor Field Current TURBINE PSS-MB PSS-dω PSS-dPa POD Stator Current Δ Rotor Speed Deviation ΔPa= Pm-Pe Accelerating Power ActivePower, PMU signals Local/ RemoteSignals Δ Rotor Speed Deviation Terminal Voltage External PSS Damping Signals Real-Time Simulation (Executed within Opal-RT) ABB Unitrol 1020 Executed as RT-HIL