Hierarchical optimal power flow control for loss minimization in hybrid multi-terminal HVDC transmission system

Han, Minxiao; Xu, Dehong; Wan, Lei

doi:10.17775/cseejpes.2016.00007

Cited by 32 publications

(18 citation statements)

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“…6 a flowchart of the EOPF is shown. Note that, since the optimal formulation is performed through the power flow, other operational goals can be added easily for different MG topologies that might need specific features, such as, losses minimization [31] (for both active and reactive power), cost minimization [32], among others.…”

Section: Optimization Problem Formulationmentioning

confidence: 99%

Extended-Optimal-Power-Flow-Based Hierarchical Control for Islanded AC Microgrids

Tinajero

Díaz

Luna

et al. 2019

IEEE Trans. Power Electron.

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This paper presents the application of a hierarchical control scheme for islanded AC microgrids with a primary droop control and a centralized extended optimal power flow control. The centralized control is responsible for computing and sending, in an online manner, the control references to the primary controls in order to achieve three operational goals, i.e., improvement of the global efficiency, voltage regulation through reactive power management and compliance of the restrictions regarding the generation units capacities. Two case studies are defined and online tested in a laboratory-scaled microgrid implemented in the Microgrid Laboratory at Aalborg University. The primary controllers are included in a real-time simulation platform (dSPACE 1006), while the extended optimal power flow is conducted in a central controller by using a Smart Meter and LabVIEW for data acquisition and MATLAB for its implementation, taking into account load and capacity profiles. The obtained results show the reliability of the proposed scheme in a real system and its advantages over the conventional droop control.

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Section: Optimization Problem Formulationmentioning

confidence: 99%

Extended-Optimal-Power-Flow-Based Hierarchical Control for Islanded AC Microgrids

Tinajero

Díaz

Luna

et al. 2019

IEEE Trans. Power Electron.

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“…In other words, embedded HVDC is mainly used for AC power flow control by active power control at both ends of the converter, improvement of voltage stability by reactive power control, suppression of failure propagation in the AC system, and system stability through frequency control. With the introduction of embedded VSC HVDC, there have been various studies of embedded VSC HVDC operation strategies as shown in [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. References [6][7][8] are early research on the operation strategy of the HVDC, which improves the stability of power facilities by Remedial Action Scheme (RAS).…”

Section: Control and Support Grid Servicementioning

confidence: 99%

“…However, by changing the HVDC operating point, system total loss can be reduced, and such studies have also been conducted. This method mainly focuses on reducing transmission loss with Multi-Terminal DC (MTDC) [18,19], and studies on finding operating points based on objective functions such as system loss, voltage deviation, and reliability criteria have been variously conducted on small scale systems [20,21]. These conventional studies have the drawback such as they were conducted in a small-scale radial system, not a large-scale meshed system; the studies manly consider only AC loss; and there is no integrated control scheme for HVDC operation considering system total loss.…”

Section: Control and Support Grid Servicementioning

confidence: 99%

Development of A Loss Minimization Based Operation Strategy for Embedded BTB VSC HVDC

et al. 2019

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Recently, there have been many cases in which direct current (DC) facilities have been placed in alternating current (AC) systems for various reasons. In particular, in Korea, studies are being conducted to install a back-to-back (BTB) voltage-sourced converter (VSC) high-voltage direct current (HVDC) to solve the fault current problem of the meshed system, and discussions on how to operate it have been made accordingly. It is possible to provide grid services such as minimizing grid loss by changing the HVDC operating point, but it also may violate reliability standards without proper HVDC operation according to the system condition. Especially, unlike the AC system, DC may adversely affect the AC system because the operating point does not change even after a disturbance has occurred, so strategies to change the operating point after the contingency are required. In this paper, a method for finding the operating point of embedded HVDC that minimizes losses within the range of compliance with the reliability criterion is proposed. We use the Power Transfer Distribution Factor (PTDF) to reduce the number of buses to be monitored during HVDC control, reduce unnecessary checks, and determine the setpoints for the active/reactive power of the HVDC through system total loss minimization (STLM) control to search for the minimum loss point using Powell’s direct set. We also propose an algorithm to search for the operating point that minimizes the loss automatically and solves the overload occurring in an emergency through security-constrained loss minimization (SCLM) control. To verify the feasibility of the algorithm, we conducted a case study using an actual Korean power system and verified the effect of systematic loss reduction and overload relief in a contingency. The simulations are conducted by a commercial power system analysis tool, Power System Simulator for Engineering (PSS/E).

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“…Major research effort has been focused on the stable operation of the MIDC systems by introducing novel indexes, such as the multi-infeed interaction factor (MIIF), multi-infeed effective 2 of 14 short-circuit ratio (MIESCR) [12], apparent increase in short-circuit ratio (AISCR) [13], and improved effective short-circuit ratio (IESCR) [14]. In parallel with such research, some studies have concentrated on the economic operation of MIDC systems, which is represented by optimal power flow (OPF) [17][18][19][20]. In two such studies [17,18], steady-state VSC-HVDC modeling methods and OPF formulations based on the Newton-Raphson method are proposed.…”

Section: Introductionmentioning

confidence: 99%

“…In one study [19], a loss minimization method with an AC/DC hybrid grid incorporating only VSC HVDCs is proposed, based on an interior-point method. In another study [20], a similar method adopting both LCC and VSC HVDC is proposed. However, the authors of the above studies only consider the steady-state values of the HVDC systems.…”

Section: Introductionmentioning

confidence: 99%

A Frequency–Power Droop Coefficient Determination Method of Mixed Line-Commutated and Voltage-Sourced Converter Multi-Infeed, High-Voltage, Direct Current Systems: An Actual Case Study in Korea

2019

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Among the grid service applications of high-voltage direct current (HVDC) systems, frequency–power droop control for islanded networks is one of the most widely used schemes. In this paper, a new frequency-power droop coefficient determination method for a mixed line-commutated converter (LCC) and voltage-sourced converter (VSC)-based multi-infeed HVDC (MIDC) system is proposed. The proposed method is designed for the minimization of power loss. An interior-point method is used as an optimization algorithm to implement the proposed scheduling method, and the droop coefficients of the HVDCs are determined graphically using the Monte Carlo sampling method. Two test systems—the modified Institute of Electrical and Electronics Engineers (IEEE) 14-bus system and an actual Jeju Island network in Korea—were utilized for MATLAB simulation case studies, to demonstrate that the proposed method is effective for reducing power system loss during frequency control.

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Hierarchical optimal power flow control for loss minimization in hybrid multi-terminal HVDC transmission system

Cited by 32 publications

References 0 publications

Extended-Optimal-Power-Flow-Based Hierarchical Control for Islanded AC Microgrids

Extended-Optimal-Power-Flow-Based Hierarchical Control for Islanded AC Microgrids

Development of A Loss Minimization Based Operation Strategy for Embedded BTB VSC HVDC

A Frequency–Power Droop Coefficient Determination Method of Mixed Line-Commutated and Voltage-Sourced Converter Multi-Infeed, High-Voltage, Direct Current Systems: An Actual Case Study in Korea

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