Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System

Bak, Yeongsu; Lee, June-Seok; Lee, Kyo‐Beum

doi:10.3390/app8010057

Cited by 34 publications

(20 citation statements)

References 39 publications

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“…It is a feedback control system that controls a controlled variable. It is the most basic control method in the process control system with the simplest structure [13]. In the heat exchanger control system, the outlet temperature of the heat transfer oil of the heat exchanger is the controlled variable.…”

Section: Control Strategy Of the Heat Storage Systemmentioning

confidence: 99%

Simulation research on the grid connected generation system of solar thermal power generation

Liang

2020

THERM SCI

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Objective: To improve the efficiency and stability of the solar thermal power generation system, and promote the optimization and development of solar thermal power generation grid connection. Methods: The working principle of the heat exchanger in the heat storage system is analyzed. Combined with the technological requirements of the system, the mathematical model of the heat exchanger is established by the mechanism modelling method. According to the inherent characteristics and control requirements of the heat storage system, the control schemes are proposed. The control strategies of different control algorithms, such as single-loop control, Smith predictive compensation control, cascade-Smith control, and feedforward-cascade-Smith control, are designed and adopted. The simulation model is established to obtain step response waveforms of different control systems. The advantages and disadvantages of different control strategies are comprehensively analyzed and compared. Results: After introducing the superheated steam mass-flow disturbance, the error of the single-loop control system increases. After adjusting the system to restore the oscillation state, the system error is high (10.24%). Smith predictive compensation control system fluctuates, with a peak time of 548 seconds and a peak temperature of 366 ℃. The cascade-Smith control system fluctuates, with a peak time of 620 seconds, a peak temperature of 398 ℃, and a maximum deviation of 31 ℃. The feedforward-cascade-Smith control system is disturbed, with a peak time of 606 seconds, a minimum temperature of 347 ℃, and a maximum deviation of 4 ℃. Compared with the cascade-Smith control system, the disturbance deviation of the feedforward-cascade-Smith control system is reduced by 87%. Conclusion: The feedforward-cascade-Smith control system proposed has the advantages of strong anti-interference ability, good stability, and small steadystate error, which has a certain significance for the development of concentrating solar power technology.

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Section: Control Strategy Of the Heat Storage Systemmentioning

confidence: 99%

Simulation research on the grid connected generation system of solar thermal power generation

Liang

2020

THERM SCI

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“…The generator-side inverter controls the torque of the PMSG to perform differential pressure control of the high-pressure fluids. Moreover, the grid-side converter performs the DC-link voltage and current control [28]. As a result, the DC-link voltage of the BTB converter is continuously controlled, and the power generated by differential pressure control is transferred to the three-phase grid.…”

Section: Control Board Of Btb Convertermentioning

confidence: 99%

Hardware-Simulator Development and Implementation for Hydraulic Turbine Generation Systems in a District Heating System

et al. 2020

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This paper presents not only a hardware-simulator development for hydraulic turbine generation systems (HTGS) in a district heating system (DHS) but also its control strategies and sequence. Generally, a DHS uses a differential pressure control valve (DPCV) to supply high-pressure–high-temperature fluids for customers depending on distance. However, long-term exposure of the DPCV to fluids increases the probability of cavitation and leads to heat loss in an event of cavitation. Therefore, a HTGS was introduced to solve this problem. It performs differential pressure control of the fluids, replaces the DPCV, and converts excess energy wasted by the DPCV to electrical energy. In this paper, the development of a hardware-simulator for HTGSs with a back-to-back converter, which uses two-level topologies, is proposed; moreover, control strategies and sequence used in this design are presented. The performance and validity of the proposed hardware-simulator and its control strategies are demonstrated by experimental results.

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“…For each case, a symmetric three-phase to ground fault on the on-shore PCC side was simulated. To satisfy the LVRT requirements of various countries, Germany and China LVRT requirements were applied in this paper [32]. The three different strategies are expressed in Table 3.…”

Section: Study Casesmentioning

confidence: 99%

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

et al. 2019

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In order to solve the problems brought upon by off-shore wind-power plants, it is important to improve fault ride-through capability when an on-shore fault occurs in order to prevent DC overvoltage. In this paper, a coordinated control strategy is implemented for a doubly-fed induction generator (DFIG)-based off-shore wind farm, which connects to on-shore land by a modular multilevel converter (MMC)-based high voltage direct current (HVDC) transmission system during an on-shore fault. The proposed control strategy adjusts the DC voltage of the off-shore converter to ride through fault condition, simultaneously varying off-shore AC frequency. The grid-side converter detects the frequency difference, and the rotor-side converter curtails the output power of the DFIG. The surplus energy will be accumulated at the rotor by accelerating the rotor speed and DC link by rising DC voltage. By the time the fault ends, energy stored in the rotor and energy stored in the DC capacitor will be released to the on-shore side to restore the normal transmission state. Based on the control strategy, the off-shore wind farm will ride through an on-shore fault with minimum rotor stress. To verify the validity of the proposed control strategy, a DFIG-based wind farm connecting to the on-shore side by an MMC HVDC system is simulated by PSCAD with an on-shore Point of Common Coupling side fault scenario.

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Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System

Cited by 34 publications

References 39 publications

Simulation research on the grid connected generation system of solar thermal power generation

Simulation research on the grid connected generation system of solar thermal power generation

Hardware-Simulator Development and Implementation for Hydraulic Turbine Generation Systems in a District Heating System

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

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