Optimal Emergency Frequency Control Based on Coordinated Droop in Multi-Infeed Hybrid AC-DC System

Liu, Ye; Song, Yankan; Wang, Zhaojian; Shen, Chen

doi:10.1109/tpwrs.2021.3052251

Cited by 33 publications

(18 citation statements)

References 62 publications

(79 reference statements)

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“…Summarizing the aforementioned analysis, the optimization model for frequency coordinated control of the asynchronous power system with multiple HVDC can be formulated: the objective function has been presented in (18); the equality constraints are shown in ( 20), ( 21) and (22); the inequality constraints are shown in ( 23), ( 24), (32), (34) and (40).…”

Section: Optimization Algorithmmentioning

confidence: 99%

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Frequency Coordinated Control for the Asynchronous Interconnected Power System With Multiple HVDC Links

Lei

Huang

2022

IEEE Access

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The isolation of the HVDC transmission system challenges the frequency stability of asynchronous power grid. Considering the high-capacity power regulation capability of multiple HVDC links , a novel frequency coordinated control method is proposed for the asynchronous interconnected power system. This method firstly establishes a detailed frequency response analysis model by using widearea measurement data. Then, for the lowest frequency control after disturbance, based on the frequency response analysis model, the functional relationship between the lowest frequency and DC power support is deduced. Finally, considering the influence of multiple HVDC power support on node voltage, power flow of line and frequency variation of the HVDC opposite-end grids, an optimal model of frequency coordination control with minimal influence is established. By solving the model, an multiple HVDC coordinated power support scheme can be obtained to achieve the lowest frequency control target after disturbance. A typical IEEE system is improved to an asynchronous interconnected power grid for case simulation. The accuracy and effectiveness of the proposed frequency coordination control are verified by comparison with traditional method.INDEX TERMS asynchronous interconnected, power system, DC power support, multiple HVDC, frequency analysis, frequency coordinated control. Power grid 1 Local power grid Power grid 2 Power grid n FIGURE 1. The multiple HVDC asynchronous system This article has been accepted for publication in IEEE Access.

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Section: Optimization Algorithmmentioning

confidence: 99%

“…In [21], an adaptive droop control strategy for multi-terminal HVDC network is proposed to provide frequency support and power sharing via a distributed consensus algorithm. Similarly, [22] has designed a coordinated droop control mechanism among LCC-HVDC systems and generators.…”

Section: Introductionmentioning

confidence: 99%

Frequency Coordinated Control for the Asynchronous Interconnected Power System With Multiple HVDC Links

Lei

Huang

2022

IEEE Access

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“…Ref. [2] proposed a decentralized EFC strategy based on coordinated droop for MIDC systems. It designed the optimal droop for power allocation based on state model of the system.…”

Section: B Literature Reviewmentioning

confidence: 99%

“…A general form of MIDC systems considered in this paper are the same as that in Ref. [2]. Considering the second-order dynamic models of generators and the first-order inertia models of a LCC-HVDC system [2], [27], [28], the dynamics of MIDC systems can be written as…”

Section: B Identifying Koopman Eigenfunctions For Frequency Dynamics ...mentioning

confidence: 99%

“…Motivation T HE technical and economic advantages of HVDC transmission technologies have promoted the development of multi-infeed hybrid AC-DC (MIDC) systems [1], in which multiple line-commutated-converter-based HVDC (LCC-HVDC) systems are connected to one AC system. In recent years, the consequent asynchronous interconnected regional power grids, complicated system dynamics and possible emergency faults of MIDC systems pose serious threats to the frequency stability of the system [2]. Frequency stability issues are caused by power imbalance.…”

Section: Introductionmentioning

confidence: 99%

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Data-driven Emergency Frequency Control for Multi-Infeed Hybrid AC-DC System

Cao¹,

Liu²,

Chen³

2022

Preprint

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With the continuous development of large-scale complex hybrid AC-DC grids, the fast adjustability of HVDC systems is required by the grid to provide frequency regulation services. This paper develops a fully data-driven linear quadratic regulator (LQR) for the HVDC to provide temporal frequency support. The main technical challenge is the complexity and the nonlinearity of multi-infeed hybrid AC-DC (MIDC) systems dynamics that make the LQR intractable. Based on Koopman operator (KO) theory, a Koopman eigenpairs construction method is developed to fit a global linear dynamic model of MIDC systems. Once globally linear representation of uncontrolled system dynamics is obtained offline, the control term is constituted by the gradient of the identified eigenfunctions and the control matrix B. In case that B is unknown, we propose a method to identify it based on the verified Koopman eigenfunctions. The active power reference is optimized online for LCC-HVDC in a moving horizon fashion to provide frequency support, with only locally measurable frequency and transmission power. The robustness of the proposed control method against approximation errors of the linear representation in eigenfunction coordinates is analyzed. Simulation results show the effectiveness, robustness and adaptability of the proposed emergency control strategy.

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Primary frequency regulation scheme applicable to LCC – VSC series hybrid HVDC considering AC voltage stability at receiving end

Liu

Chen

Yang

et al. 2022

International Journal of Electrical Power & Energy Systems

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Optimal Emergency Frequency Control Based on Coordinated Droop in Multi-Infeed Hybrid AC-DC System

Cited by 33 publications

References 62 publications

Frequency Coordinated Control for the Asynchronous Interconnected Power System With Multiple HVDC Links

Frequency Coordinated Control for the Asynchronous Interconnected Power System With Multiple HVDC Links

Data-driven Emergency Frequency Control for Multi-Infeed Hybrid AC-DC System

Primary frequency regulation scheme applicable to LCC – VSC series hybrid HVDC considering AC voltage stability at receiving end

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