VOLTAGE STABILITY OF THE NORDIC TEST SYSTEM
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1 1 VOLTAGE STABILITY OF THE NORDIC TEST SYSTEM Thierry Van Cutsem Department of Electrical and Computer Engineering University of Liège, Belgium Modified version of a presentation at the IEEE PES General Meeting, Washington D.C., July 2014
2 Available at 2
3 3 Contents System overview Modelling Dynamic responses to disturbances Preventive voltage security assessment Corrective (post-disturbance) control
4 4 transmission : 400 & 220 kv sub-transmission : 130 kv 50 Hz system 74 buses 20 generators 102 branches, including 20 step-up transformers 22 distribution transformers
5 5 large, equivalent gener. hydro units - primary frequency control long, series-compensated 400-kV lines thermal units - constant mechanical power synchronous condenser
6 oper. point A oper. point B 6
7 Dynamic security assessment Operating point A : very insecure several single contingencies cause instability even some transient angle instability cases 7 Operating point B : secure the system can stand a 5-cyle (0.1 s) fault on any line, cleared by tripping the line the system can stand the outage of any single generator Criteria used in long-term dynamic simulation all distribution voltages restored into their deadband by Load Tap Changers ( all load powers restored) no loss of synchronism no generator has its terminal voltage settling below 0.85 pu
8 8 Contents System overview Modelling Dynamic responses to disturbances Preventive voltage security assessment Corrective (post-disturbance) control
9 9 Exciter, AVR, PSS and OverExcitation Limiter (OEL) fixed delay or inverse-time
10 Capability curves of round-rotor generators for various terminal voltages 10
11 Hydro Turbine model 11 Speed-governor model
12 12 Load model (sub-)transmission distribution Load Tap Changers (LTC): voltage deadband : [ ] pu range of transformer ratio : [ ] pu/pu 33 tap positions various tapping delays
13 13 Contents System overview Modelling Dynamic responses to disturbances Preventive voltage security assessment Corrective (post-disturbance) control
14 14 3-phase 5-cycle (0.1 s) fault cleared by opening the line, which remains opened
15 Secure oper. point B - Transmission voltage 15 LTC tap changes
16 Secure oper. point B - Voltage at LTC-controlled distrib. buses 16 LTC voltage deadband
17 Insecure oper. point A - Transmission voltages 17 North area South area Central area
18 Insecure oper. point A - Generator field currents 18
19 Insecure op. point A - Voltage at LTC-controlled distrib. bus 19 LTC voltage deadband
20 Insecure op. point A - rotor angles (wrt center of inertia) 20 g6 going out of step wrt other generators
21 The fact that load power passes through a maximum gives an indication of the impending instability. 21 This can be identified through a change of sign of sensitivities. In this example sensitivities of total reactive power generation to various load reactive powers.
22 22 Contents System overview Modelling Dynamic responses to disturbances Preventive voltage security assessment Corrective (post-disturbance) control
23 23 Example of PV curves A slow load increase in the Central area is simulated : the P o and Q o coefficients of the loads are linearly increased with time since the load increase is slow, the operator reaction is simulated : the ratios of the transformers and are adjusted to keep the voltages at buses 1044 and 1045 in a dead-band the system response is determined at selected transmission buses, the voltage is plotted as a function of the total load power i P oi ( V i V oi ) α i in the Central area
24 24
25 25 Secure Operation Limit (SOL) An SOL corresponds to the maximum «stress» that can be accepted in the pre-contingency configuration such that the system responds in a stable way to each of the specified contingencies stress = increase of load power in Central area tools : power flow computations for various values of Central area load long-term dynamic simulations to assess the system response to each contingency
26 Example of SOL determination - secure oper. pt B 26 marginally stable case marginally unstable case
27 27 Contents System overview Modelling Dynamic responses to disturbances Preventive voltage security assessment Corrective (post-disturbance) control
28 Corrective control : LTC voltage set-point reduction 28 5 % voltage setpoint reduction on 11 LTCs no corrective action 5 % voltage setpoint reduction on 5 LTCs
29 Corrective control : undervoltage load shedding MW load shed by distributed controllers (each shedding 50 MW every 3 s until V transm > 0.90 pu) no corrective action
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