Economic benefit evaluation of multi-terminal VSC HVDC systems with wind farms based on security-constrained optimal power flow

Takano

et al. 2018

Self Cite

From the economic viewpoint, multi‐terminal voltage‐source converter high voltage direct current (VSC HVDC) transmission system configurations have many advantages over point‐to‐point VSC HVDC systems in large‐scale wind power transmission scenarios. In these scenarios, the economic benefits comparison between point‐to‐point and multi‐terminal VSC HVDC systems based on the security‐constrained optimal power flow analysis is the main target of this paper. It is revealed that compared to point‐to‐point VSC HVDC systems, the proposed multi‐terminal VSC HVDC systems have the following economic benefits. More effective economic load dispatch can be achieved. In addition, the wheeling charge produced by the multi‐terminal VSC HVDC systems is also higher due to the higher multi‐terminal VSC HVDC systems' capacity factor. The lower fuel costs and higher wheeling charge of the multi‐terminal VSC HVDC systems are reflected in the annual cash inflow. The economic benefits of the multi‐terminal VSC HVDC systems are proved by calculating the higher Net Present Value (NPV) and Profitability Index (PI) values of the systems. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

“…0.5% of the total investment costs of each VSC HVDC system is required as the VSC HVDC maintenance costs in every year. More details of are explained in .

normalNPV = ([], \sum_{t = 1}^{LT} \frac{{normalCF}_{t}}{{((), 1 + normalir)}^{t}}) - normalInv . Costs

{CF}_{t} = {Cash Inflow}_{t} - {Cash Outflow}_{t}

{Cash Inflow}_{t} = normalF . C_{reduc, t} + normalVSC {HVDC}_{wheeling, t}

{Cash Outflow}_{t} = normalVSC {HVDC}_{maintenance, t}

…”

Section: Npv and Profitability Indexmentioning

confidence: 99%

“…0.5% of the total investment costs of each VSC HVDC system is required as the VSC HVDC maintenance costs in every year. More details of (13)-(15) are explained in [22].…”

Section: Npv and Profitability Indexmentioning

confidence: 99%

Economic benefits comparison between point‐to‐point and multi‐terminal VSC HVDC systems with large‐scale wind farms

Takano

et al. 2018

Self Cite

“…[13]. The N-1 criterion of power systems has been included in the OPF in mixed AC/VSC HVDC systems in Refs [14][15][16][17]. Voltage stability has been taken into consideration in the OPF analysis in Ref.…”

Section: Introductionmentioning

confidence: 99%

A novel economic analysis on multiterminal VSC HVDC systems with wind farms by hierarchical small‐signal stability constrained OPF

Takaguchi

et al. 2020

Self Cite

In this paper, a novel economic analysis for multiterminal voltage‐source converter high‐voltage direct current (MTDC) systems with wind farms is developed. Both the reinforcement and operation methods of an MTDC system are determined hierarchically in the proposed approach. Based on these methods, not only wind power transmission but also the MTDC system is capable of contributing to the power transmission among alternating current (AC) grids in cases of low wind power production cases. As a consequence, the economic benefits produced by the MTDC system can be increased. This paper also focuses on the sensitivity analysis of small‐signal stability constraints on the developed approach. It is demonstrated that the system for wind power transmission without any MTDC systems is exposed to instability, which is solved by the proposed method. On top of that, the small‐signal stability improvement effect of the MTDC system is analyzed from the economic viewpoint. Under strict small‐signal stability constraints, the economic benefits obtained by the MTDC system increase. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

“…, a multiterminal VSC‐HVDC system with a novel two wind farms and one substation ‘2WF‐1SS’ topology for offshore wind power transmission was developed to reduce the number of HVDC circuit breakers and grid‐side VSCs. The economic advantages of a multiterminal VSC‐HVDC system compared to a point‐to‐point VSC‐HVDC system was pointed out in Ref .…”

Section: Introductionmentioning

confidence: 99%

“…VSC-HVDC vector current controller structure of HVDC circuit breakers and grid-side VSCs. The economic advantages of a multiterminal VSC-HVDC system compared to a point-to-point VSC-HVDC system was pointed out in Ref [13].…”

Section: Introductionmentioning

confidence: 99%

Small‐signal stability‐constrained optimal power flow analysis of multiterminal VSC‐HVDC systems with large‐scale wind farms

Takaguchi

et al. 2019

Self Cite

As a solution for the large‐scale wind power transmission in a power system model in East Japan, multiterminal VSC‐HVDC systems are proposed to be installed in the system model. To evaluate the effectiveness of the systems, small‐signal stability‐constrained optimal power flow (SSSC‐OPF) analysis in mixed AC/multiterminal VSC‐HVDC systems is developed. It is revealed by SSSC‐OPF analysis that the system reinforced only by an AC system is exposed to unstable operations. In contrast, mixed AC/multiterminal VSC‐HVDC systems do not suffer from such unstable system operations. On top of that, the differences in multiterminal VSC‐HVDC systems with different configurations are also discussed. Different annual fuel costs and wind power hosting capacity results are obtained due to AC transmission line capacities and interarea oscillation modes. The best multiterminal VSC‐HVDC system among all simulated multiterminal VSC‐HVDC systems is also concluded. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.