During faulted condition, the bus voltages are dictated by the fault impedance (and the system conditions). As such, CPF will not help here.
Shri From: <bounce-123653231-83436...@list.cornell.edu> on behalf of Ismael K Abdulrahman <ikabdulra...@students.tntech.edu> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Date: Saturday, June 1, 2019 at 8:03 AM To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Subject: Re: Question about power flow for a system with faulted bus Thanks Shri for your reply and the nice trick you mentioned; I never thought about it. How about using continuation power flow instead of a regular power flow? Is it possible to use it for this kind of problem? As you know, CPF is widely used to solve low voltage problem. Any idea? Thank you once again. Ismael On Jun 1, 2019, at 7:38 AM, Abhyankar, Shrirang G <shrirang.abhyan...@pnnl.gov<mailto:shrirang.abhyan...@pnnl.gov>> wrote: Ismael, Power flow with loads modeled as “constant power” faces convergence issue when the voltages are low. A common trick is to convert constant power loads to constant impedance loads for low voltages. In MATPOWER, you can convert all the loads to constant impedance using the options 'exp.sys_wide_zip_loads.pw' (real power) and 'exp.sys_wide_zip_loads.qw'. Here, pw and qw are fractions of constant power, constant current, and constant impedance load composition. For a constant impedance only load the fractions should be [0,0,1]. Shri From: <bounce-123652900-83373...@list.cornell.edu<mailto:bounce-123652900-83373...@list.cornell.edu>> on behalf of Ismael K Abdulrahman <ikabdulra...@students.tntech.edu<mailto:ikabdulra...@students.tntech.edu>> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>> Date: Saturday, June 1, 2019 at 1:17 AM To: "matpower-l@cornell.edu<mailto:matpower-l@cornell.edu>" <matpower-l@cornell.edu<mailto:matpower-l@cornell.edu>> Subject: Question about power flow for a system with faulted bus Dear Matpower community, I am a Ph.D. student working in power system dynamic analysis. I use Matpower for computing the initial values of the system variables. I want to find the initial values of the algebraic variables (voltage magnitude, voltage angle, generator current phasors...) at the time of disturbance. The disturbance is a three phase fault at one bus in the system, usually a load or zero-injection bus. I tried to consider the faulted bus as a generator with zero power and zero voltage, but the problem cannot be solved. I was wondering if there is any way to get around this problem? I greatly appreciate your help. Thanks in advance Ismael
