Midcontinent Independent System Operator

About: Midcontinent Independent System Operator is a based out in . It is known for research contribution in the topics: Wind power & Electric power system. The organization has 52 authors who have published 85 publications receiving 2703 citations. The organization is also known as: Midwest Independent Transmission System Operator & Midwest ISO.

Control of DFIG-Based Wind Generation to Improve Interarea Oscillation Damping

Abstract: Power systems with high penetration of wind power usually require long-distance transmission to export wind power to the market. Interarea oscillation is an issue faced in long-distance transmission. Can wind generation based on doubly fed induction generator (DFIG) help to damp oscillations and how? In this paper, a control scheme is developed for the DFIG with rotor-side converter to damp interarea oscillations. The DFIG is modeled in MATLABreg/Simulink utilizing its vector control scheme feature, and inner current control and outer active/reactive power control loops are modeled and designed. A two-area system that suffers from poor interarea oscillation damping along with a wind farm in the area that exports power is investigated. A damping controller is designed and time-domain simulations are used to demonstrate the effectiveness of the controller. The major contributions of the paper are as follows: 1) built a wind farm interarea oscillation study system based on the classical two-area four-machine system, 2) established that in vector control scheme, active power modulation can best help to damp oscillations, 3) successfully designed a feedback controller using remote signals with good interarea oscillation observability.

Market Solutions for Managing Ramp Flexibility With High Penetration of Renewable Resource

Abstract: The impact of increased penetration of renewable generation has been the subject of much discussion related to system operations. As the percentage of generation from renewable generation provides us a greener and more sustainable future, it also introduces new challenges in scheduling and dispatching controllable resources to follow the net load and control the power balance in the system. The increased renewable generation tends to introduce more variability that must be met by the traditionally more flexible generation resources. Incentives are needed to encourage the existing generators of all types to maximize the availability of their operational “load following” flexibility and to encourage entry of new flexible suppliers such as energy storage devices or demand response.

Small-Signal Stability Analysis of a DFIG-Based Wind Power System Under Different Modes of Operation

Abstract: This paper focuses on the super/subsynchronous operation of the doubly fed induction generator (DFIG) system. The impact of a damping controller on the different modes of operation for the DFIG-based wind generation system is investigated. The coordinated tuning of the damping controller to enhance the damping of the oscillatory modes using bacteria foraging technique is presented. The results from eigenvalue analysis are presented to elucidate the effectiveness of the tuned damping controller in the DFIG system. The robustness issue of the damping controller is also investigated.

Recent developments in state estimation with phasor measurements

Abstract: Synchronized Phasor Measurement Units (PMU) are being installed in many power systems around the world. Several of these installations intend to utilize the PMU data to augment features of their state estimators. This paper summarizes results of recent research which have used phasor measurements in novel ways. Beginning with a phasor based state estimation technique the paper considers an innovative approach to incorporating phasor data in conventional state estimators. The paper reviews the concept of complete and incomplete observability with phasor data, and the use of incompletely observed state to achieve pseudo observability. Also included is a discussion of seams between adjoining state estimates, and a new concept of using phasor measurements to calibrate instrument transformers.