Analysis and suppression of subsynchronous oscillation of Rudong wind power through MMC-HVDC system

Li, J.; Xie, X.; Yang, J.; Li, H.; Shi, Z.; Wang, K.; Fu, C.; Yang, W.

doi:10.1049/icp.2021.2553

Cited by 6 publications

(6 citation statements)

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“…Substituting Equation (17) into Equation ( 16) yields the MMC positive-sequence impedance after suppression.…”

Section: Simulation Verificationmentioning

confidence: 99%

“…Eigenvalue analysis is essentially an extension of the traditional sensitivity criteria applied to the Jacobian matrix. In reference [17], considering multiple factors, the eigenvalue analysis method was employed to analyze high-frequency resonance phenomena in flexible DC transmission systems. Critical determinants for high-frequency resonance modes were pinpointed to be the bandwidth pertaining to the inner current loop of the MMC, as well as the state variables linked to the delay in the control loop.…”

Section: Introductionmentioning

confidence: 99%

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MMC-HVDC High-Frequency Resonance Suppression Strategy Based on Multi-Band Band-Stop Filters

Cui,

Wang,

Wang

2023

Sustainability

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Renewable energy generation is a manifestation of global economic and societal advancement and serves as a fundamental assurance for humanity’s pursuit of sustainable development. However, recent years have witnessed several instances of high-frequency resonance events in high-voltage direct current (HVDC) transmission systems based on modular multilevel converters (MMC), which have resulted in converter station tripping and significant repercussions on the alternating current (AC) grid. This paper addresses the mid-to-high frequency resonance issues prevalent in flexible DC transmission systems employing modular multilevel converters (MMC-HVDC). To tackle these concerns, an impedance model for MMC’s AC side is established. Utilizing impedance analysis, the essential factors contributing to the negative damping characteristics of MMC are identified as delay and voltage feedforward loops, predominantly causing negative damping in the frequency range exceeding 400 Hz. In response, a suppression strategy is proposed, involving the incorporation of a multi-band stop filter and virtual impedance. This strategy ensures that within the 0–2000 Hz frequency range, only the impedance phase within 230–430 Hz slightly surpasses 90°. Consequently, the phase difference between MMC’s positive-sequence impedance and the AC system impedance is reduced from 222° to 174.7°, thus guaranteeing secure grid operation. Lastly, the accuracy and effectiveness of the theoretical analysis and suppression methodology are verified through the development of an electromagnetic transient model in MATLAB/Simulink, considering delay fluctuations of ±10%.

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“…Substituting Equation (17) into Equation ( 16) yields the MMC positive-sequence impedance after suppression.…”

Section: Simulation Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MMC-HVDC High-Frequency Resonance Suppression Strategy Based on Multi-Band Band-Stop Filters

Cui,

Wang,

Wang

2023

Sustainability

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“…It can be seen that when the parameter k p1 increases from 0.772 to 1.224, the poorest damping eigenvalue for the full-order PMSG model λ i moves to the right half of the complex plane. Generally speaking, when designing PMSG control parameters, we first determine the control bandwidth of the inner loop and then set the control bandwidth and related parameters of the outer loop according to the bandwidth and parameters of the inner loop [20]. The transfer function of the PMSG inner loop current control can be expressed as:…”

Section: Stable Domainmentioning

confidence: 99%

“…Let s = jω; also, the transfer function Ti(s) amplitude is set to 0.707, and the corresponding frequency ω is the bandwidth of the inner loop current control, which can be written as ω = ωi = 2πfi. The relationship between the parameters of the inner and outer loop can be expressed as follows: Generally speaking, when designing PMSG control parameters, we first determine the control bandwidth of the inner loop and then set the control bandwidth and related parameters of the outer loop according to the bandwidth and parameters of the inner loop [20]. The transfer function of the PMSG inner loop current control can be expressed as:…”

Section: Stable Domainmentioning

confidence: 99%

Research on Control Inertia and Stability of PMSG

Shi

Yan

et al. 2022

Electronics

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With the large-scale development and application of offshore wind resources, the proportion of powered electronic equipment in power systems is increasing, which leads to the reduction of traditional mechanical inertia and system oscillation. To solve the above problems, this paper takes the grid connected converter of an offshore full power fan as the research object, deduces the “inertia” expression and physical significance of its inner and outer loop controller, and compares it with the mechanical inertia motion equation to obtain a unified mathematical expression. On this basis, combined with the control bandwidth and Rouse criterion, the discrimination method of system stability is proposed, and the correlation of the internal and external control parameters of the full power fan grid connected converter and its influence on the grid connected stability of offshore fans are explained according to the derived judgment expression. Finally, the correctness and scope of application of the theoretical analysis and judgment method are verified by PSCAD/EMTDC time-domain simulation software.

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“…The sub/super-synchronous stability of the MMC-HVDC-connected OWF was analyzed with different bandwidths of MMC current controller in [17]. The influence of controller dynamics on the wideband (1-1000 Hz) stability of the system was explored in [18]. In the above research, the influence factors in MHFRs are not explained.…”

Section: Introductionmentioning

confidence: 99%

Small-Signal Stability Analysis and MOSMA-Based Optimization Control Strategy of OWF with MMC-HVDC Grid Connection

Zheng,

Li,

Zhang

et al. 2023

Sensors

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The recent oscillation events in offshore wind farms (OWFs) connected via a modular multilevel-converter-based HVDC (MMC-HVDC) system are developing towards a wider frequency band, which causes complex a small-signal interaction phenomenon and difficulties in the stability analysis and control. In this paper, the wideband dynamic interaction mechanism is investigated based on the impedance analysis method and an improved control strategy using an optimization algorithm is proposed to improve the small-signal stability and reduce the oscillation risks. First, the detailed impedance models of the grid-connected system are established considering the distribution characteristics of the submarine cable, control delay and frequency coupling effect. Then, combined with the active damping control method, the wideband resonance mechanism is analyzed, and the stability constraints of controller parameters are obtained using the impedance stability criterion. Finally, an improved multi-objective slime mold algorithm (MOSMA)-based coordinated optimization control strategy is proposed to enhance the adaptability of the controller parameters and the wideband damping ability of a grid-connected system, which can improve the wideband stability of the system. The simulation and experimental results verify the proposed control strategy.

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Analysis and suppression of subsynchronous oscillation of Rudong wind power through MMC-HVDC system

Cited by 6 publications

References 0 publications

MMC-HVDC High-Frequency Resonance Suppression Strategy Based on Multi-Band Band-Stop Filters

MMC-HVDC High-Frequency Resonance Suppression Strategy Based on Multi-Band Band-Stop Filters

Research on Control Inertia and Stability of PMSG

Small-Signal Stability Analysis and MOSMA-Based Optimization Control Strategy of OWF with MMC-HVDC Grid Connection

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