Phasor-Based Control for Scalable Integration of Variable Energy Resources

Meier, Alexandra von; Ratnam, Elizabeth L.; Brady, Kyle; Moffat, Keith; Swartz, Jaimie

doi:10.3390/en13010190

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…An innovative framework termed phasor-based control (PBC) is proposed in [13] by von Meier et al, to facilitate the integration of heterogeneous and intermittent distributed energy resources (DER) on the electric grid. PBC presents a unified approach that is agnostic to optimization criteria and to the particular characteristics of participating resources.…”

Section: Published Papers Highlightsmentioning

confidence: 99%

Modern Power System Dynamics, Stability and Control

Alexandridis¹

2020

Energies

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This Special Issue of Energies, “Modern Power System Dynamics, Stability and Control”, addresses the core problem of deploying novel aspects in the analysis of modern power systems as these are composed after the high penetration of distributed generation (DG) with different renewable energy sources (RES). The focus is given either on the new whole power and control system configuration or on individual cases of DG sources, power converters and other general or specific plants and devices. The problem can be tackled with different methodologies and may have several, more or less valuable and complicated solutions. The twenty-three accepted papers certainly offer a good contribution in a wide range of applications; they are extended from basic system theory perspectives, fundamental nonlinear analysis tools and novel modeling deployments to some interesting particular system and control issues.

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Section: Published Papers Highlightsmentioning

confidence: 99%

Modern Power System Dynamics, Stability and Control

Alexandridis¹

2020

Energies

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“…If the chosen solver then returns an optimal set of variables that satisfies the original set of power flow constraints, that system state is a global optimum for the original problem. 2 While many of these methods show promise and achieve success under a variety of conditions, there are outstanding difficulties in practical implementation, particularly on unbalanced, multi-phase distribution networks. As a result, we instead looked to quadratic programming (QP) for implementing the S-PBC.…”

Section: Linearizationmentioning

confidence: 99%

Phasor-Based Control for Scalable Solar PV Integration

Meier

2021

Self Cite

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This project demonstrated that solar PV can be recruited to stabilize the grid, smooth out disturbances, manage power flows, and assist circuit switching operations. It developed a radically new, layered control framework for Distributed Energy Resources (DER) to act in response to real-time, measured conditions on their local distribution circuit, rather than waiting for a price signal to indicate preferred behavior. By enabling resources to act as good citizens on the electric grid, Phasor-Based Control (PBC) facilitates arbitrarily high solar penetration levels.PBC expresses objectives in terms of voltage phasors, which include information about both the magnitude and the precise timing of grid voltage at each specific location. A supervisory (S-PBC) controller sets voltage phasor targets at different nodes in the transmission or distribution network, and local (L-PBC) controllers recruit real and reactive power from resources such as solar inverters, batteries or loads to track phasor targets. The technology makes use of ultraprecise measurements from micro-phasor measurement units (µPMUs).Phasor-based control prioritizes stabilizing the grid locally, toward operating states known to be safe in accordance with physical operating constraints, while buying time for economic reoptimization after major changes or contingencies. In doing so, it advances grid reliability and resilience. The framework supports many diverse use cases that specify desired voltage phasors at certain nodes. It applies to distribution as well as transmission systems, although this project focused primarily on distribution applications and simulation. Sample use cases tested in this project include power flow control, voltage management, phase balancing, and support for switching operations. Key Project Accomplishments include the following:• Built a repository of non-proprietary test circuit models.• Demonstrated that supervisory phasor-based control can produce phasor targets consistent with optimal power flow objectives, using suitable linearization techniques. • Demonstrated that local phasor-based controllers can be effectively tuned to recruit distributed resources for tracking a target phasor and reject disturbances. • Built a novel communications and control infrastructure, termed the Distributed Extensible Grid Control (DEGC) platform. • Demonstrated fast simulation capabilities for large networks using a novel partitioning strategy.• Produced successful PBC simulations on large, realistic distribution circuits.• Validated simulation results in hardware-in-the-loop (HIL) testing with physical µPMUs, inverters and load banks. • Produced a value analysis for PBC based on enhanced grid security.• Identified proliferation opportunities for PBC and infrastructure technology.The technology is now ready to be field deployed in an experimental pilot setting.

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“…Voltage Phasor Control (VPC), also called Phasor Based Control [22], is a novel paradigm for implementing OPF which incorporates distributed feedback controllers, but in a different manner than AGC or Volt-Watt/Volt-VAR control. With VPC, the optimization broadcasts voltage phasor (magnitude and angle) setpoints, rather than real and reactive power setpoints, to participating nodes equipped with Phasor Measurement Units (PMUs).…”

Section: Introductionmentioning

confidence: 99%

Using Voltage Phasor Control to Avoid Distribution Network Constraint Violations

Moffat¹,

Meier²

2022

Preprint

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In this paper, we introduce Voltage Phasor Control (VPC), also known as Phasor Based Control, as a novel way of implementing Optimal Power Flow (OPF). Unlike conventional OPF, in which the power flow optimization broadcasts power injections, the VPC power flow optimization broadcasts voltage phasor setpoints to feedback controllers distributed throughout the network which respond to disturbances in real time. In this paper, we demonstrate that VPC can actively manage distributed energy resources to avoid voltage magnitude and line flow constraint violations in power distribution networks. We provide sensitivities and bounds that quantify how the distributed voltage phasor feedback control reduces the effect of disturbances on the network voltages and line flows. Using simulations, we compare the performance of VPC with the related but more conventional Voltage Magnitude Control (VMC). The sensitivities, bounds, and simulations provide implementation insights, which we highlight, for how distribution network operators can use VPC and VMC to avoid constraint violations.

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Phasor-Based Control for Scalable Integration of Variable Energy Resources

Cited by 17 publications

References 26 publications

Modern Power System Dynamics, Stability and Control

Modern Power System Dynamics, Stability and Control

Phasor-Based Control for Scalable Solar PV Integration

Using Voltage Phasor Control to Avoid Distribution Network Constraint Violations

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