Phần 20 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Nghiên cứu ứng dụng Ổn định dài hạn trên Phần mềm PSSE)

Phần 20 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Nghiên cứu ứng dụng Ổn định dài hạn trên Phần mềm PSSE)• LongTerm Stability in PSS®E• LongTerm Frequency Stability

TRANSMISSION & DISTRIBUTION A Division of Global Power POWER SYSTEM STABILITY CALCULATION TRAINING D9 Aliti fL T St bilit D ay 9 - A pp li ca ti on o f L ong- T erm St a bilit y July 16, 2013Prepared by: Mohamed El Chehaly OUTLINE 2 OUTLINE • Long-Term Stability in PSS®E • Long-Term Frequency Stability 3 LONG-TERM STABILITY IN PSS®E PSS®E Long Term Stability 4 LONG-TERM STABILITY IN PSS®E Long - Term Stability  Si l ti ti i f  Si mu l a ti on ti mes rang i ng f rom many seconds to several minutes  The need to model additional effects not normally considered in stability runs of normally considered in stability runs of several seconds  Computer time requirements would be excessive excessive Long Term Stability 5 LONG-TERM STABILITY IN PSS®E Long - Term Stability  If simulation time is extended to several d secon d s  Tendency of loads to exhibit constant power characteristics through tap changers characteristics through tap changers  Automatic switching of reactors and shunt capacitors  Primary movers power changes through primary speed control and/or AGC (automatic generation control) and excitation limiters control) and excitation limiters  Detailed modeled of load restoration mechanisms and prime mover characteristics (boiler effects, exhaust temperature effects on gas turbine…) Extended Term Module 6 LONG-TERM STABILITY IN PSS®E Extended Term Module  Additi l d l th t h t b  Additi ona l mo d u l e th a t h as t o b e purchased  Includes the following:  Includes the following:  Augmentation of most equipment models containing state variables to include an implicit containing state variables to include an implicit integration algorithm technique for use in performing extended term simulations  Th bilit t h th i l ti ti t  Th e a bilit y t o c h ange th e s i mu l a ti on ti me s t ep during the simulation  Several additions to the model library  Several additions to the model library On load Tap Changer OLTC1 7 LONG-TERM STABILITY IN PSS®E On - load Tap Changer OLTC1  Mdlf th t f t dj t t  M o d e l f or th e t rans f ormer t ap a dj us t men t s to help control system voltage  Two main components:  Two main components:  Voltage sensor: if the voltage input is out of the specified bandwidth, the control will operate after specified bandwidth, the control will operate after the time delay has been exceeded  Time delay circuit: enables the transformer to tlth lt iti thtitf correc t on l y th ose vo lt age var i a ti ons th a t ex i s t f or longer than a preset time On load Tap Changer OLTC1 8 LONG-TERM STABILITY IN PSS®E On - load Tap Changer OLTC1  Ti d l 30 d  Ti me d e l ay = 30 secon d s On load Tap Changer OLTC1 9 LONG-TERM STABILITY IN PSS®E On - load Tap Changer OLTC1  MdlOLTC1t i l l  M o d e l OLTC1 t yp i ca l va l ues On load Phase Shifter OLPS1 10 LONG-TERM STABILITY IN PSS®E On - load Phase Shifter OLPS1  Mdlf th t ti t ft  M o d e l f or th e au t oma ti c movemen t o f t aps on phase-shifting transformers to control the power flow the power flow  Same two components as OLTC1  Same two components as OLTC1  Only difference is that the input is real  Only difference is that the input is real power instead of voltage [...]... drop varies as square of steam flow and with density of steam  The pressure drop coefficient is shown to be a function of boiler pressure 19 LONG-TERM STABILITY IN PSS®E Steam Turbine and Boiler TGOV5 20 LONG-TERM STABILITY IN PSS®E Steam Turbine and Boiler TGOV5 C Conventional control ti l t l  Boiler follow mode: changes in generation are initiated by turbine control valves  Boiler controls respond . OUTLINE 2 OUTLINE • Long-Term Stability in PSS®E • Long-Term Frequency Stability 3 LONG-TERM STABILITY IN PSS®E PSS®E Long Term Stability 4 LONG-TERM STABILITY IN PSS®E Long - Term Stability  Si. considered in stability runs of normally considered in stability runs of several seconds  Computer time requirements would be excessive excessive Long Term Stability 5 LONG-TERM STABILITY. caused either by a failure of a component of the voltage regulators of an abnormal system condition Maximum Excitation Limiters MAXEX1 13 LONG-TERM STABILITY IN PSS®E Maximum Excitation