A System Model-Based Approach for the Control of Power Park Modules for Grid Voltage and Frequency Services

Abstract

A new control approach is proposed for the grid insertion of Power Park Modules (PPMs). It allows full participation of these modules to ancillary services. This means that, not only their control have some positive impact on the grid frequency and voltage dynamics, but they can effectively participate to existing primary and secondary control loops together with the classic thermal/inertia synchronous generators and fulfill the same specifications both from the control and contractual points of view.To achieve such level of performances, a system approach based on an innovatory control model is proposed. The latter control model drops classic hypothesis for separation of voltage and frequency dynamics used till now in order to gather these dynamics into a small size model.From the system point of view, dynamics are grouped by timescales of phenomena in the proposed control model. This results in more performant controls in comparison to classic approaches which orient controls to physical actuators (control of grid side converter and of generator side converter). Also, this allows coordination between control of converters and generator or, in case of multimachines specifications, among several PPMs.From the control synthesis point of view, classic robust approaches are used (like, e.g., H-infinity synthesis).Implementation and validation tests are presented for wind PPMs but the approach holds for any other type of PPM.These results will be further used to control the units of the new concept of Dynamic Virtual Power Plant introduced in the H2020 POSYTYF project.

EMT three-phase VSC grid-connected converter reactive power control using H∞ LMI MIMO approach

“…This is less efficient than advanced optimal H ∞ disturbance rejection techniques such as [5]. As proven in these works (e.g., in our previous work [5]), the new MIMO control methodology provides much better performance and stability margin.…”

“…The proof for H ∞ optimization (first LMI condition) can be seen in [9] in general linear system and in [5], [6] for VSCbased systems. The proof for pole placement (second LMI condition) can be seen in [9].…”

“…Recently, there are many studies conducted for improving the VSC produced power quality, including cascade control (i.e., classical vector control) [4] and advanced Multi-Input Multi-Output (MIMO) control [5] [6]. The two-loops cascade control approach use feed-forward decoupling terms to separate the two d-axis current and q-axis current [4].…”

“…The two-loops cascade control approach use feed-forward decoupling terms to separate the two d-axis current and q-axis current [4]. This is less efficient than advanced optimal H ∞ disturbance rejection techniques such as [5]. As proven in these works (e.g., in our previous work [5]), the new MIMO control methodology provides much better performance and stability margin.…”

Direct Participation of Dynamic Virtual Power Plants in Secondary Frequency Control

“…Indeed, classic hypotheses for the separation of voltage and frequency dynamics used until now no longer hold for RES connected to the grid by power electronics as they have both rapid voltage and frequency dynamics. The model introduced in [23] is used here to combine these dynamics into a simple mathematical object used both for the control and simulation validations.…”