A General Unified AC/DC Power Flow Algorithm With MTDC

Lei, Jingting; An, Ting; Zhang, Du; Yuan, Zheng

doi:10.1109/tpwrs.2016.2628083

Cited by 68 publications

(50 citation statements)

References 24 publications

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“…The ability of VSC converter to independently control the reactive power results in two different representations in the power flow algorithms, namely constant reactive power injection Q si into AC grid and the constant AC bus voltage magnitude V ti [8]. Therefore, the PQ or PV mode is usually used to represent the reactive power control behaviors of VSCs in most power flow models on VSC-MTDC [26,27]. The switching characteristics of reactive power control behaviors of VSC stations should be considered during the load growth.…”

Section: Simulation For Switching Characteristics Of Reactive Power Cmentioning

confidence: 99%

A Continuation Power Flow Model of Multi-Area AC/DC Interconnected Bulk Systems Incorporating Voltage Source Converter-Based Multi-Terminal DC Networks and Its Decoupling Algorithm

et al. 2019

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Existing continuation power flow (CPF) models mainly focus on the regional independent systems, which are not suitable for multi-area AC/DC interconnected systems because the market trading behaviors and security control for power allocation of tie-lines are ignored. This study presents a novel CPF model and its decoupling algorithm for multi-area AC/DC interconnected systems incorporating a voltage source converter (VSC)-based multi-terminal direct current (MTDC) network. This CPF model includes the following unique features: (1) In view of the bilateral power trading contracts among regional subsystems, the nonlinear constraint equations of directional trading active power via interface are derived, and the multi-balancing machine strategy is introduced to realize the active power balance of each subsystem. (2) An accurate simulation method for the security control behaviors of the power allocation in tie-lines is proposed, which includes a specific selection strategy for automatic generation control units and a generation re-dispatch strategy. These two strategies work together to prevent the serious overload in tie-lines during load growth and improve the voltage stability margin of the interconnected bulk systems. (3) The switching characteristic of reactive power control behaviors of VSC stations is simulated in the CPF calculation. In the end, a novel decoupling CPF algorithm based on bi-directional iteration is presented to realize the decomposition and coordination calculation. This decoupling algorithm preserves the precision and convergence of integrated CPF algorithms, and it has an apparent advantage on the calculation speed. Furthermore, this decoupling algorithm also can easily reflects the effects of the control mode changes of VSC stations to the voltage stability margin of AC system. Case studies and comparative analysis on the IEEE two-area RTS-96 system indicate the effectiveness and validity of the proposed CPF model and corresponding decoupling algorithm.

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Section: Simulation For Switching Characteristics Of Reactive Power Cmentioning

confidence: 99%

A Continuation Power Flow Model of Multi-Area AC/DC Interconnected Bulk Systems Incorporating Voltage Source Converter-Based Multi-Terminal DC Networks and Its Decoupling Algorithm

et al. 2019

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“…The authors of [4] indicate that the initial values of the bus voltage magnitude and angle are set as 1 and 0 p.u, the initial values of the DC current and firing angle are all set to zero, and the converter voltage and tap changer are set as the rated value. Nevertheless, when k γ k Rec V n /V Rec < 1, a complex value will appear in the first iteration to calculate the reactive equivalent power and will be the initial values of the next iteration, in which case the final results are incorrect.…”

Section: Initial Values and Specified Valuesmentioning

confidence: 99%

“…The power flow model of the hybrid system with the HVDC line is available in many papers. In [3,4], the unified algorithm is employed to the hybrid system with the voltage source converter HVDC (VSC-HVDC), with the advantage of high efficiency. In addition, a general multi-terminal VSC-HVDC model based on the sequential method is proposed in [5].…”

Section: Introductionmentioning

confidence: 99%

Power flow modelling to UHVDC line and its hierarchical connection mode

Huang

2018

IET Generation, Transmission & Distribution

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“…This process is achieved by AC/DC power flow calculations. As for AC/DC power flow solutions, both unified algorithms [21][22][23] and sequential algorithms [24][25][26][27] are theoretically feasible. Specific to AC/DC networks embedded with hybrid HVDC systems, only a few papers addressed their power flow solutions.…”

Section: Introductionmentioning

confidence: 99%

Electromechanical Transient Modeling of Line Commutated Converter-Modular Multilevel Converter-Based Hybrid Multi-Terminal High Voltage Direct Current Transmission Systems

Liang

Xiao

et al. 2018

Energies

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Abstract:A method for electromechanical modeling of line commutated converter (LCC)-modular multilevel converter (MMC)-based hybrid multi-terminal High Voltage Direct Current Transmission (HVDC) systems for large-scale power system transient stability study is proposed. Firstly, the general idea of modeling the LCC-MMC hybrid multi-terminal HVDC system is presented, then the AC-side and DC-side models of the LCC/MMC are established. Different from the conventional first-order DC-side model of the MMC, an improved second-order DC-side model of the MMC is established. Besides considering the firing angle limit of the LCC, a sequential power flow algorithm is proposed for the initialization of LCC-MMC hybrid multi-terminal HVDC system. Lastly, simulations of small scale and large scale power systems embedded with a three-terminal LCC-MMC hybrid HVDC system are performed on the electromechanical simulation platform PSS/E. It is demonstrated that if the firing angle limit is not considered, the accuracy of the power flow solutions will be greatly affected. Steady state calculation and dynamic simulation show that the developed LCC-MMC hybrid MTDC model is accurate enough for electromechanical transient stability studies of large-scale AC/DC system.

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A General Unified AC/DC Power Flow Algorithm With MTDC

Cited by 68 publications

References 24 publications

A Continuation Power Flow Model of Multi-Area AC/DC Interconnected Bulk Systems Incorporating Voltage Source Converter-Based Multi-Terminal DC Networks and Its Decoupling Algorithm

A Continuation Power Flow Model of Multi-Area AC/DC Interconnected Bulk Systems Incorporating Voltage Source Converter-Based Multi-Terminal DC Networks and Its Decoupling Algorithm

Power flow modelling to UHVDC line and its hierarchical connection mode

Electromechanical Transient Modeling of Line Commutated Converter-Modular Multilevel Converter-Based Hybrid Multi-Terminal High Voltage Direct Current Transmission Systems

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