Experiment Study on the Control Method of Motor-Generator Pair System

Zhou, Yifei; Xu, Guorui; Wei, Siming; Zhang, Xin; Huang, Yuehui

doi:10.1109/access.2017.2776974

Cited by 14 publications

(11 citation statements)

References 12 publications

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“…and the DC link capacitor voltage. Therefore, the source-grid difference increases, and P increases accordingly [16]. At the same time, the increase of P leads to an increase in the discharging speed of the DC capacitor, and U dc decreases accordingly.…”

Section: Control Methods and Isolation Protection Mechanism Of Mgmentioning

confidence: 96%

“…The voltage phase difference between the two terminals of the MGP system is proportional to the active power P transferred through the MGP system [16], so P increases with the increase of the phase difference. The above characteristic of the MGP system is the physical basis to realize its stable operation control.…”

Section: Control Methods and Isolation Protection Mechanism Of Mgmentioning

confidence: 99%

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Isolation and Protection of the Motor-Generator Pair System for Fault Ride-Through of Renewable Energy Generation Systems

Huang

et al. 2020

IEEE Access

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Renewable energy units are required to have reliable fault ride-through capability to prevent large-scale disconnection of renewable energy plants due to grid faults. Since synchronous generators have better voltage and current resistance capabilities, one of the advantages of renewable energy connected to the grid through the motor-generator Pair (MGP) system is the isolation of grid faults, which is totally different from existing fault ride-through methods. First, the structure and mathematical model of the MGP system are introduced in this paper. Then, a novel control method for the MGP system based on DC link voltage feedback is given, which is very important for fault ride-through in the control power balance on both sides of the DC bus. The isolation mechanism, damping and reactive power support functions of the MGP system on grid faults are analyzed by means of the rotor motion equation and phasor diagram of synchronous machine. A 5-kW MGP simulation and experimental platforms are built to verify the isolation and protection effects of the MGP system on a renewable energy generation system during the transient processes of grid voltage sag, overvoltage and multiple voltage sags. The results demonstrate that the MGP system can isolate grid faults on the generator side, while the oscillation amplitude on the motor side is much smaller, and the generator can provide strong reactive power support to the grid during three grid faults. INDEX TERMS Fault ride-through, high proportion renewable energy grid, motor-generator pair (MGP), multiple voltage sags, fault isolation.

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Section: Control Methods and Isolation Protection Mechanism Of Mgmentioning

confidence: 96%

Section: Control Methods and Isolation Protection Mechanism Of Mgmentioning

confidence: 99%

Isolation and Protection of the Motor-Generator Pair System for Fault Ride-Through of Renewable Energy Generation Systems

Huang

et al. 2020

IEEE Access

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“…According to the DC voltage control, the output frequency of the inverter can be defined as

f_{normalref} = K_{normalP} Δ U_{normaldc} + K_{normalI} \int normalΔ U_{dc} d t

where K P and K I are PI parameters of the DC‐link voltage control. The approximate active power output of the MGP system, P G , can be expressed as [17]

P_{normalG} = K_{normalMGP} false(δ_{M} + δ_{G} + δ_{0} false)

where δ 0 is the phase difference between electromotive force of the SM and SG, and K MGP is the power coefficient of the MGP system. The power angles of SM and SG can be expressed as

\{\begin{matrix} left δ_{M} = 2 π f_{ref} t - ω_{r} t + δ_{0} \\ left δ_{G} = ω_{r} t - 2 π f_{g} t + δ_{0} \end{matrix} .

…”

Section: Pfr and Improved DC Voltage Control Methods Of Re‐adopting Tmentioning

confidence: 99%

Effects of motor–generator pair system on improving inertial response and primary frequency regulation capability of renewable energy

Huang

et al. 2021

IET Renewable Power Gen

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The increasing penetration of renewable energy leads to the decrease of inertia and damping for replacing conventional power plants. The motor–generator pair (MGP) is proposed to improve inertial response and frequency regulation capability for the renewable energy. First, the mathematical model of the MGP and the control method of DC‐link voltage are given. Then, the inertial characteristics of the MGP are analysed, and a mass block is designed by analysing the key factor affecting the moment of inertia. The transient processes in two machines are discussed by comparing the variations of the voltage and current vectors. It turns out that the electromagnetic–mechanical coupling is the key to realise the primary frequency regulation without frequency acquisition. The photovoltaic (PV) is chosen to illustrate the mechanism of achieving a better primary frequency response with DC‐link voltage control methods based on the de‐loading and additional frequency deviation strategies. A grid‐scale simulation model is built to verify the effectiveness of the proposed scheme. Furthermore, six groups of experiments are designed and performed on an experimental bench. The simulation and experimental results demonstrate that the inertial response and primary frequency response of PV can be improved effectively by adopting MGP for grid connection.

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“…As shown in Fig. 6, the PLC control link essentially controls the power angle of the MGP through real‐time detection power to realise the output of the given power [17] (see Fig. 7).…”

Section: Methodsmentioning

confidence: 99%

Motor‐generator pair: novel technology to transmit stable and high‐quality power for power system with high penetration of renewable energy

Zhang

Hang

2019

J. eng.

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Experiment Study on the Control Method of Motor-Generator Pair System

Cited by 14 publications

References 12 publications

Isolation and Protection of the Motor-Generator Pair System for Fault Ride-Through of Renewable Energy Generation Systems

Isolation and Protection of the Motor-Generator Pair System for Fault Ride-Through of Renewable Energy Generation Systems

Effects of motor–generator pair system on improving inertial response and primary frequency regulation capability of renewable energy

Motor‐generator pair: novel technology to transmit stable and high‐quality power for power system with high penetration of renewable energy

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