Decentralized and autonomous voltage balancing control approach for hybrid multi-terminal Ultra-HVDC system

Yang, Shuo; Guo, Chunyi; Liu, Bo; Lin, Xin; Zhao, Chengyong

doi:10.1016/j.ijepes.2019.105472

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…In [8], a distributed consensus scheme is developed such that each agent utilizes only its states and the output information of its neighbours. Decentralized voltage, and power control of hybrid high voltage DC are well discussed in [9]. Distributed LQR for control of coupled identical subsystems is investigated in [10].…”

Section: Introductionmentioning

confidence: 99%

Robust decentralized control of interval DC linked hybrid microgrids network

Nabi

Seyedtabaii

2022

IET Control Theory & Appl

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Here, a robust sparse decentralized controller (RSDC) for uncertain DC-linked hybrid microgrids is designed. The robustness against load/generation uncertainty is guaranteed using Kharitonov's stability criteria and sparsity is promoted by appending an l 1 term to the typical Linear Quadratic Regulator (LQR). To improve the convergence rate, the differentiable term of the composite cost function is second order approximated, the coordinate descent technique is adopted, and the "active set" idea which limits the search to the effective regions is employed. In addition, the level of sparsity is automatically and optimally adjusted not to compromise the system's stability and robustness. The algorithm is applied to a 69-bus (consist of 7 hybrid microgrid) distribution system and the controller sparsity percentage, design convergence rate, and performances are compared with the H 2 and H ∞ designs. The results indicate that the proposed method is superior to the others in all aspects, which are presented by the numerical indices, the time-domain transient responses, and the closed-loop poles map.

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Section: Introductionmentioning

confidence: 99%

Robust decentralized control of interval DC linked hybrid microgrids network

Nabi

Seyedtabaii

2022

IET Control Theory & Appl

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“…Modular multilevel converter based high voltage direct current (MMC-HVDC) system has been widely used in asynchronous interconnection, cross regional long-distance power transmission, largescale transmission of new energy and power supply of weak AC system because of its advantages of high waveform quality, flexible structure, easy expansion and no commutation failure [1][2][3][4] . With the rapid development of large-scale new energy sources and the increase of DC transmission capacity, the connection strength between the AC and DC side is becoming weaker, which is mainly manifested as a weak AC power grid characterized by a low short-circuit ratio.…”

Section: Introductionmentioning

confidence: 99%

Influence of DC transmission distance on MMC-HVDC stability under weak AC system

Zhao¹,

Wang²

2022

J. Phys.: Conf. Ser.

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The oscillation problem of MMC-HVDC under weak AC system poses a potential threat to the safe and stable operation of power grid, which is related to both of the AC and DC parameters. By comparing the stability of MMC-HVDC under different AC system strength with different DC transmission distance, it is found that when the AC system strength is too weak, there is a risk of instability under the condition of long DC transmission distance, and the correctness of this conclusion is verified by time-domain simulation. Later, the mechanism analysis of this phenomenon is carried out, the result shows that it is related to the interaction of MMC subsystems when the strength of AC system decreases.

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“…A distributed cooperative control design for a multi‐terminal DC (MTDC) power system employing the consensus protocol is applied in [3]. Decentralized voltage and power control of Hybrid HVDC has been explored in [7].…”

Section: Introductionmentioning

confidence: 99%

Optimal sparse control of interval networks: Voltage source converter based DC grid study

Nabi

Seyedtabaii

2021

IET Generation Trans & Dist

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Decentralized optimal control of interval state space systems involves significant complications due to the required sparsity, robustness, and convergence rate. By adding an l1 term to the standard linear quadratic optimization, the obtained composite index, accommodating the sparsity, contains both differentiable and non-differentiable terms. Knowing that the choice of optimization techniques are problem-dependent, in this paper, several smart provisions such as "Active set", "Coordinate descent", and separately managing the differentiable part of the cost function are put together to form a relatively fast algorithm. In addition, a rule is introduced to adjust automatically the degree of sparsity and a constraint to confine the interval closed-loop system eigenvalues to the desired s plane region. As a result, a robust sparse decentralized control (RSDC) approach for interval networks is established. The RSDC method is utilized for the control of a multi-terminal VSC (Voltage Source Converter ) -based DC (Direct Current) grid with parametric uncertainty under various external random perturbations. The test results show that the proposed method with just 20 feedback links (out of available 100) performs superiorly to the alternative ones in terms of sparsity, convergence rate, and time-domain performances, verified through extensive simulations.

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Decentralized and autonomous voltage balancing control approach for hybrid multi-terminal Ultra-HVDC system

Cited by 10 publications

References 9 publications

Robust decentralized control of interval DC linked hybrid microgrids network

Robust decentralized control of interval DC linked hybrid microgrids network

Influence of DC transmission distance on MMC-HVDC stability under weak AC system

Optimal sparse control of interval networks: Voltage source converter based DC grid study

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