Adaptive Reference Power Based Voltage Droop Control for VSC-MTDC Systems

Wang, Yizhen; Qiu, Fengliang; Liu, Guowei; Lei, Ming; Liu, Yang; Wang, Chengshan

doi:10.35833/mpce.2021.000307

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…It is noted that Method II is derived from (35). Based on the DC grid lossless, ∆𝑉 is the identical voltage variation.…”

Section: Discussionmentioning

confidence: 99%

“…In the ideal DC grid lossless model [33], [46], the DC voltages are assumed to be identical. Thus, (31) can be rewritten as ∆𝑃 𝑗 = (∆𝑉 𝑗 * − ∆𝑉) 𝑅 𝑗 (35) where ∆𝑉 is the identical voltage variation.…”

Section: B Proposed Methods IImentioning

confidence: 99%

“…Using the PVDC can avoid the large errors involved in the local voltage droop control strategy with the DC grid lossless model, because active power sharing of a pilot voltage feedback signal does not rely on the local voltage following a contingency [23]. The relationship between power variation ∆𝑃 𝑗 and pilot voltage variation ∆𝑉 𝑝 is given by ∆𝑃 𝑗 = (∆𝑉 𝑝 * − ∆𝑉 𝑝 ) 𝑅 𝑗 (37) Comparing ( 35) and (37), setting 𝑉 𝑗 * of all the droopcontrolled converters to be adaptive in (35) can provide m degree of freedom, while setting 𝑉 𝑝 * to be adaptive in (37) can only provide one degree of freedom. Thus, the disadvantage of the PVDC is that it lacks degree of freedom for the adaptive droop control.…”

Section: B Proposed Methods IImentioning

confidence: 99%

“…with(35) and(37), it can be seen that the MPVDC avoids the large errors involved in the DC grid lossless model with local voltage droop control and at the same time provides as much degree of freedom as the local voltage droop control.…”

mentioning

confidence: 99%

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Adaptive Voltage Reference Based Controls of Converter Power Sharing and Pilot Voltage in HVDC System for Large-Scale Offshore Wind Integration

Zhang,

Qian,

Shao

et al. 2024

IEEE Open J. Power Energy

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Active power sharing and voltage regulation are two of the major control challenges in the operation of the voltage source converter based multi-terminal high-voltage DC (VSC-MTDC) system when integrating large-scale offshore wind farms (OWFs). This paper proposes two novel adaptive voltage reference based droop control methods to regulate pilot DC voltage and share the power burden autonomously. The proposed Method I utilizes DC grid lossy model with the local voltage droop control strategy, while the proposed Method II adopts a modified pilot voltage droop control (MPVDC) to avoid the large errors caused by the DC grid lossless model. Dynamic simulations of a five-terminal MTDC grid are carried out using MATLAB/Simulink SimPowerSystems /Specialized Technology to verify the proposed autonomous control methods under various types of disturbance and contingency. In addition, comparative study is implemented to demonstrate the advantages of the proposed methods. Index Terms-Adaptive voltage reference based droop, autonomous control, offshore wind farms (OWFs), power sharing, power-voltage droop control, voltage regulation, voltage source converter based multi-terminal high-voltage DC (VSC-MTDC). I. INTRODUCTIONACING finite fossil fuels and worldwide appeal for cutting down greenhouse gas emission, the past twenty years witness a continuous growing share of the sustainable energies in the power generation mix [1]- [3]. As one of the mainstream renewable energy technologies, offshore wind generation is growing rapidly in many countries in Europe, North America, and Asia [4], [5]. There are two feasible technologies to integrate the offshore wind farms into an existing AC system, i.e. high voltage ac grid and voltage source converter based high-voltage DC (VSC-HVDC) grid. However, the advantages of independent control of the active and reactive powers, undersea connection, as well as power flow redirection capability make HVDC grid, i.e. multiterminal HVDC (MTDC) system, a preferable solution to integrate offshore wind farms [1], [6]- [9].The classical VSC control schemes for MTDC system can be categorized into three types: V-P control [10], voltage

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“…It is noted that Method II is derived from (35). Based on the DC grid lossless, ∆𝑉 is the identical voltage variation.…”

Section: Discussionmentioning

confidence: 99%

Section: B Proposed Methods IImentioning

confidence: 99%

Section: B Proposed Methods IImentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Adaptive Voltage Reference Based Controls of Converter Power Sharing and Pilot Voltage in HVDC System for Large-Scale Offshore Wind Integration

Zhang,

Qian,

Shao

et al. 2024

IEEE Open J. Power Energy

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“…The first method involves achieving rational distribution of unbalanced power and mitigating DC voltage deviation by improving the droop coefficient. Refs (Liu et al, 2020;He et al, 2023;Wang et al, 2023). propose various adaptively adjusted droop control methods to suppress DC voltage deviation through the adjustment of the droop coefficient.…”

mentioning

confidence: 99%

Improved coordinated control strategy for VSC-MTDC system with DC voltage secondary regulation

Li,

Zhang,

et al. 2024

Front. Energy Res.

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Droop control is widely used in multi-terminal flexible DC (VSC-MTDC) transmission systems by virtue of the advantage of multi-station cooperative unbalanced power dissipation, however, the essence of the droop control strategy is to change the DC current to realize the unbalanced power dissipation, and the resulting DC voltage deviation will affect the normal operation of the system. Firstly, this paper theoretically analyses the working characteristics of the conventional droop control and proposes a control method to realize the quasi-differential-free regulation of DC voltage by translating the droop curve. Second, according to the power margin of the converter station, the feedforward compensation amount of each converter station is reasonably set to avoid the power impact on the converter station. Finally, for the problem that the actual value of DC voltage still deviates from the rated value, a control strategy containing secondary regulation of DC voltage is proposed to further restore the DC voltage to the initial value on the basis of ensuring the effect of power regulation, which improves the stability of the operation of the VSC-MTDC system. The final simulation results verify the effectiveness of the proposed method.

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A real-time optimization method in multi-terminal DC distribution system based on adaptive model predictive control

Zhao,

Peng,

Xian

et al. 2024

Sustainable Energy Technologies and Assessments

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Adaptive Reference Power Based Voltage Droop Control for VSC-MTDC Systems

Cited by 8 publications

References 29 publications

Adaptive Voltage Reference Based Controls of Converter Power Sharing and Pilot Voltage in HVDC System for Large-Scale Offshore Wind Integration

Adaptive Voltage Reference Based Controls of Converter Power Sharing and Pilot Voltage in HVDC System for Large-Scale Offshore Wind Integration

Improved coordinated control strategy for VSC-MTDC system with DC voltage secondary regulation

A real-time optimization method in multi-terminal DC distribution system based on adaptive model predictive control

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