The small signal stability analysis of dc distribution network

2019 ◽  
Author(s):  
Changli Shi ◽  
Tongzhen Wei ◽  
Qunhai Huo ◽  
Tongshuo Zhang ◽  
Junqiang He
Keyword(s):  
Stability Analysis ◽  
Distribution Network ◽  
Small Signal ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Dc Distribution ◽  
Small Signal Stability Analysis

scholarly journals Power Decoupling Control of MMC and Small-Signal Stability Analysis of AC/DC Distribution Network With Renewable Energy

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhang Xianyong ◽  
Guo Zijuan ◽  
Huang Yaohong ◽  
Li Li ◽  
Peng Weikuan ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Distribution Network ◽  
Decoupling Control ◽  
Small Signal ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Dc Distribution ◽  
Power Decoupling ◽  
Value Model ◽  
Small Signal Stability Analysis

AC/DC hybrid distribution network can realize the high penetration utilization of renewable energy and modular multilevel converter (MMC) is the key equipment to connect AC grid and DC grid. In this paper, the direct modulation based on the virtual resistor and the reference value of dc-bus voltage is adopted, and instantaneous-value model of three-phase half-bridge MMC is derived by introducing differential-mode and common-mode component representation. Then, the decoupling control of AC active power and reactive power is designed based on the linear active disturbance rejection control theory (LADRC). The total disturbances including the coupling term and capacitor voltage fluctuation can be estimated by extended state observer (ESO), and then cancelled exactly. Based on the simplified average-value model of MMC, the small signal stability analysis of three-terminal AC/DC distribution network with 26-level MMCs corresponding to the Tangjiawan-Jishan1-Jishan2 demonstration project is carried out by root locus and bode diagram method, which gives the guidance for the choice of the main circuit component and controller parameters, and shows that the virtual resistor greatly reduces the resonant peak of AC/DC distribution network. Simulation and experiment results verify the effectiveness of the power decoupling control strategy of MMC and the AC/DC distribution network can realize complex multi-directional power flow.

scholarly journals Small-signal stability analysis for the multi-terminal VSC MVDC distribution network; a review

2019 ◽  
Vol 2019 (16) ◽  
pp. 1068-1075
Author(s):  
Patrobers Simiyu ◽  
Ai Xin ◽  
Girmaw T. Bitew ◽  
Muhammad Shahzad ◽  
Wang Kunyu ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Distribution Network ◽  
Small Signal ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Small Signal Stability Analysis

scholarly journals Small-Signal Stability Analysis for Multi-Terminal LVDC Distribution Network Based on Distributed Secondary Control Strategy

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1575
Author(s):  
Zhenyu Lv ◽  
Min Zhou ◽  
Qi Wang ◽  
Wenqiang Hu
Keyword(s):  
Control Strategy ◽  
Distribution Network ◽  
Small Signal ◽  
Small Signal Stability ◽  
Analysis Model ◽  
Secondary Control ◽  
Signal Stability ◽  
Small Signal Analysis ◽  
Dc Line ◽  
Small Signal Stability Analysis

This paper presents a detailed and accurate small-signal analysis model for a four-terminal low-voltage direct current (LVDC) distribution network with distributed secondary control strategy. To tackle the contradiction between power sharing accuracy and average voltage recovery ability of voltage source converters (VSCs), a distributed secondary control strategy is adopted, which is based on average consensus algorithm and local voting protocol. Furthermore, to analyze the stability of LVDC distribution network based on the proposed distributed secondary control strategy, a detailed and accurate small-signal analysis model is formulated which is derived from various non-linear state-space sub-models. The time-domain simulation and electromagnetic simulation are carried out to verify the validity and accuracy of the proposed model. Based on this model, the influence rules of main eigenvalues are summarized with the variation of PI control and DC line parameters. Time-domain simulations conducted in PSCAD are used to validate the operational limits of the secondary controllers and DC line obtained from the small-signal stability analysis.

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