Coordination Control Between Excitation and Hydraulic System During Mode Conversion of Variable Speed Pumped Storage Unit

Chen, Yahong; Deng, Changhong; Zhao, Yating

doi:10.1109/tpel.2021.3061268

Cited by 16 publications

(1 citation statement)

References 16 publications

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“…In this paper, the vector control startup mode based on stator field orientation is selected. Firstly, the coordinate transformation of the above formulas (1) and (2) is required to obtain the voltage and flux linkage equations in the d/q two-phase rotating coordinate system 20 :…”

Section: Mathematical Model Of Vspsu Self-starting Processmentioning

confidence: 99%

Self-starting control strategy of variable speed pumped storage unit based on adaptive full order state observer

Zhu

Ruan

2022

Measurement and Control

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When the variable speed pumped storage unit operates in the electrical state, the self-starting control strategy is generally used to start the process from zero speed to grid connection, which saves the starting device of the traditional constant speed unit and saves the construction cost of the unit. For the self-starting control process, the traditional open-loop flux calculation method will produce cumulative errors in the amplitude and angle of the flux when the motor parameters change. To solve this problem, an adaptive full order state observer is designed to observe the motor stator flux, which has stronger parameter robustness. Based on the flux observation, the speed adaptive law is designed to estimate the rotor speed and position angle, and the speed sensorless vector control of variable speed pumped storage unit is accomplished. The simulation results show that compared with the open-loop flux calculation method, the full order state observer can greatly reduce the flux estimation error and accurately estimate the rotor speed and position angle.

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Section: Mathematical Model Of Vspsu Self-starting Processmentioning

confidence: 99%

Self-starting control strategy of variable speed pumped storage unit based on adaptive full order state observer

Zhu

Ruan

2022

Measurement and Control

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A capacitor voltage ripple suppression method employing bidirectional‐switching channel for the MMC driven pumped storage system operating at low‐speed stage

Yao,

Chen,

Zhang

2024

Circuit Theory & Apps

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SummaryThe Modular Multilevel Converter (MMC) has gained the widespread application in the DC power transmission, owing to the advantages such as modularity and low output current harmonic content. However, its adoption in variable‐speed pumped storage systems remains limited due to the significant voltage fluctuations in its sub‐module capacitors during the low‐speed operation. In this paper, a capacitor voltage ripple suppression method employing bidirectional‐switching channel is proposed. It aims to improve the driving performance of MMC when the variable‐speed pumped storage motor operates at low speed. The proposed method creates bidirectional‐switching channels between the sub‐modules of the upper and lower bridge arms and moves the sub‐module capacitors that originally fixed to the upper and lower bridge arms into the channels. By controlling the bidirectional‐switching channel, the same capacitor can be put into the sub‐modules of different bridge arms. At the same time, a threshold switching control method is proposed to reduce the switching loss. Without introducing the common mode voltage, the capacitor voltage fluctuation can be substantially suppressed when the pumped storage motor operates at low speed. Experimental and simulation results verify the effectiveness of the proposed method.

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Study on Small Disturbance Stability of Large Doubly-Fed Variable Speed Pumped Storage Unit

Li¹,

Xu²,

Xiang³

et al. 2023

Lecture Notes in Electrical Engineering

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Coordination Control Between Excitation and Hydraulic System During Mode Conversion of Variable Speed Pumped Storage Unit

Cited by 16 publications

References 16 publications

Self-starting control strategy of variable speed pumped storage unit based on adaptive full order state observer

Self-starting control strategy of variable speed pumped storage unit based on adaptive full order state observer

A capacitor voltage ripple suppression method employing bidirectional‐switching channel for the MMC driven pumped storage system operating at low‐speed stage

Study on Small Disturbance Stability of Large Doubly-Fed Variable Speed Pumped Storage Unit

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