1 Decentralized Adaptive Voltage Control with Distributed Energy Resources Presenter: Huijuan Li

Outline Introduction Power Electronic Interface of DE and Control Challenges in Setting the Control Parameters Adaptive Control Method Simulation & Experimental Results Conclusion & Future Work

Electrical Power Systems & Distributed Generation 3

Voltage Regulation with DEs DERs with power electronic interface are capable of supplying voltage regulation service. Traditional regulation methods include: transformer tap change, capacitor banks switching. Centralized or manual control. voltage regulation with DEs are decentralized, automatic and fast responsive. Integrated voltage regulation using multiple DERs can increase the voltage regulation capability and reduce the capital and operating costs

Power Electronic Interface & Control Parallel connection of a DE with PE converter Control diagram for compensator voltage regulation Controlled Voltage Source

Challenges in Setting Controller Parameters Short of system information System condition is quite dynamic

Adaptive Control Methods Desired response and actual response of adaptive controller The optimal control response can be approximated as a first order system. A logic is added to follow this pattern by adjusting controller parameters in real time

Adaptive Control Design (1) Determine DC Voltage PWM voltage control by varying modulation index

Adaptive Control Design (2) Set initial value for the parameters <=

Adaptive Control Design (3) Adaptively adjusting parameters

Simulation Results Non-adaptive voltage regulation with the KP and KI fixed at the initial values Adaptive voltage regulation A radial simulation system

Filed Experimental Results ORNL test system

Filed Experimental Results voltage with adaptive voltage regulationvoltage with non-adaptive voltage regulation

Conclusion & Future Work DEs can be part of the solution to prevent voltage instability and possible collapse since they can control reactive power injection and voltage locally and dynamically. The method proposed has a wide adaptability and is easy to use for practicing engineers The simulation and experimental results show that this method satisfies the rapid response requirement and keeps the voltage response from overshoot and instability problems. In future work, additional theoretical research of multipleDEs to control voltage will be performed