Research and application of multiple STATCOMs to improve the stability of AC/DC power systems in China Southern Grid

STATCOMs is used widely in power systems these days. Traditionally, this converter was controlled using a doubleloop control or Direct Output Voltage (DOV) controller. But DOV controller do not function properly during a three-phase fault and has a lot of overshoot. Also, the number of PI controllers used in double-loop control is high, which led to complexities when adjusting the coefficients. Therefore, in this paper, an improved DOV method is proposed which, in addition to a reduced number of PI controllers, has a higher speed, lower overshoots and a higher stability in a wider range. By validating the proposed DOV method for controlling the STATCOMs, it has been attempted to improve the dynamical behaviors of induction motor using Matlab/Simulink, and the results indicate a better performance of the proposed method as compared to the other methods.

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“…Then, using Iq and Id, the reference value of the STATCOM output voltage is obtained through Eq. (14). As can be seen in Fig.…”

Section: B the Proposed Control Strategymentioning

confidence: 65%

Dynamic Behavior Control of Induction Motor with STATCOM

Dehghani

Karimyan

Abedi

et al. 2018

2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES)

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“…It can be observed that the selected HVDC system from the first to third iteration is the HVDC line of GN, but the selected HVDC system near the critical parameter is the HVDC line of FF. When Z 6 f.cr = 0.0071 p.u., σ 4 cr = 0.91% is less than ε 2 , then the search is over. This search method ensures the monotonicity of the index-parameter is not affected by the complex factors of the multiple CFs during the entire search process, which guarantees the convergence.…”

Section: Multi-infeed Hvdc Systemmentioning

confidence: 99%

“…The suppression of CF is important to reduce the risk of DC blocking and increase the transmission capacity of HVDC links. So far, there have been a number of solutions to reduce the risk of CF, which can be classified as follows: the modification of converter topology [3]- [5], the improvement of voltage stability [6], [7], the modification of HVDC control systems [8]- [12], and the application of system emergency control strategies [13], [14], etc. However, the determination of control quantity and control time as well as the assessment of control effects depends on the accurate judgment and evaluation of CF.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment for Commutation Security Based on Extinction Angle Trajectory

Xue

2021

Journal of Modern Power Systems and Clean Energy

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In order to reduce the risk of commutation failure (CF) in the AC/DC hybrid power system, the quantitative analysis on CF is required for on-line assessment and optimal control. This paper presents an accurate and reliable method to quantify the commutation security based on the trajectory due to the complexity of the high-voltage direct current (HVDC) model. Firstly, the characteristics of the extinction angle trajectory are analyzed under both commutation success and failure conditions. The commutation security margin index (CSMI) is then proposed for the HVDC systems. Moreover, a search strategy for parameter limits is put forward based on the sensitivity analysis of CSMI to accelerate the search speed with a guaranteed accuracy level. A modified IEEE 39-bus power system and an actual large-scale power system with 46 generators and 821 buses are utilized to verify the validity and robustness of the proposed index and strategy.

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“…However, the literature focuses on the differences between the two kinds of energy storage, and lacks a complete capacity allocation method for DESSs. The capacity allocation of devices for reactive power compensation is studied in [13,14]. Firstly, the nodes with high sensitivity are selected as the alternative nodes, and the steady-state and transient voltage support effects are calculated, respectively, to obtain the optimal configuration scheme.…”

Section: Introductionmentioning

confidence: 99%

Location and Capacity Optimization of Distributed Energy Storage System in Peak-Shaving

et al. 2020

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The peak-valley characteristic of electrical load brings high cost in power supply coming from the adjustment of generation to maintain the balance between production and demand. Distributed energy storage system (DESS) technology can deal with the challenge very well. However, the number of devices for DESS is much larger than central energy storage system (CESS), which brings challenges for solving the problem of location selection and capacity allocation with large scale. We formulate the charging/discharging model of DESS and economic analysis. Then, we propose a simulation optimization method to determine the locations to equip with DESSs and the storage capacity of each location. The greedy algorithm with Monte Carlo simulation is applied to solve the location and capacity optimization problem of DESS over a large scale. Compared with the global optimal genetic algorithm, the case study conducted on the load data of a district in Beijing validates the efficiency and superiority of our method.

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Research and application of multiple STATCOMs to improve the stability of AC/DC power systems in China Southern Grid

Cited by 19 publications

References 32 publications

Dynamic Behavior Control of Induction Motor with STATCOM

Dynamic Behavior Control of Induction Motor with STATCOM

Quantitative Assessment for Commutation Security Based on Extinction Angle Trajectory

Location and Capacity Optimization of Distributed Energy Storage System in Peak-Shaving

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