Multi-terminal Medium Voltage DC Distribution Network Large-signal Stability Analysis
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ORIGINAL ARTICLE
Multi‑terminal Medium Voltage DC Distribution Network Large‑signal Stability Analysis Patrobers Simiyu1 · Ai Xin1 · Niasse Mouhammed1 · Wang Kunyu1 · Joseph Gurti1 Received: 2 May 2020 / Revised: 21 July 2020 / Accepted: 3 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract The Brayton-Moser’s mixed potential theory is a popular approach for large-signal stability analysis of DC-based systems with constant power load (CPL). The criterion from the conventional mixed potential theory contains multiple time-varying parameters which are complicated for convenient stability analysis hence the need for simplification. On the other hand, stability analysis of droop-controlled multiple source converter-based DC systems are scarce. Thus, the large-signal stability criterion of a scaled-down droop-controlled multi-terminal MVDC distribution network with CPL using Brayton-Moser’s mixed potential theory was simplified and derived to show that CPL power rating, PI control parameters, droop and damping coefficients have profound effects on the system’s large-signal stability. By way of MATLAB/Simulink simulations, the large-signal stability of the MVDC distribution system was observed to reduce with increase in CPL power rating and source converter droop coefficients as well as increase with increase in proportionate coefficient values and use of optimized unlike non-optimized damping coefficients. Therefore, the droop-controlled MVDC distribution network with optimized PI control parameters, droop and damping coefficients have enhanced dynamic response and large-signal stability margin proving the accuracy and validity of the simplified large-signal stability criterion. Keywords CPL · DC voltage droop · Large-signal stability · MVDC distribution network · Mixed potential theory
1 Introduction Advances in VSC and cable technologies are paving way for new electricity market requirements in favor of multiterminal VSC–MVDC distribution network integration in commercial and industrial applications [1, 2]. The MVDC distribution network typically rated 1.5–30 kV, offers power systems’ solutions like de-risking VSC-HVDC transmission systems, AC distribution network reinforcements, renewable energy (RE) integration, railway system applications, urban electrification etc. [2–5]. Its feasibility has been proven extensively in many researches in the US [6], Germany [7], China [8] amongst others from which several aspects have emerged as hot research topics namely; dynamic DC voltage control, MVDC network stability analysis, MVDC system
* Patrobers Simiyu [email protected] 1
State Key Laboratory of Alternate Electric Power Systems With Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
protection investigations and distributed energy resource (DERs) integration [2, 7, 8]. In a multi-terminal MVDC distribution system, energy sources and loads are connected to the DC distribution bus via power converters [1, 6]. Typically, a converter works under closed-loo
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