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| Dynamic Simulation Model of MVDC Generating Set Considering the Speed Regulation Characteristics of Prime Movers |
| Yi Xinqiang, Wang Dong, Liu Haitao, Zhao Haoran, Yuan Zhifang |
| National Key Laboratory of Electromagnetic Energy Naval University of Engineering Wuhan 430033 China |
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Abstract Compared with the medium voltage AC(MVAC) integrated power system, the medium voltage DC(MVDC) integrated power system eliminates the influence between the rotational speed of the prime mover and the frequency of the power grid, providing an effective solution for the parallel power supply of multiple gas turbine generator sets, diesel engine generator sets, and steam turbine generator sets with different speed regulation characteristics and magnitude differences in capacity. In MVDC integrated power systems, a multi-machine parallel power supply is commonly used to improve fuel operation economy and power supply reliability. If a single unit trips, it will trigger a dynamic process of sudden load application to units on the grid. The stability of the grid voltage is crucial at the beginning of the design of the MVDC integrated power system, which is closely related to the speed regulation of the prime mover and the voltage regulation of the generator. Therefore, it is necessary to establish a dynamic simulation model for MVDC generator units considering the speed regulation characteristics of the prime mover.
Based on traditional modeling methods for synchronous generators, this paper takes a time base value of 1, unifying the electrical angular velocity input interface of the mathematical models for twelve-phase synchronous generators and their three-phase exciters. A variable coefficient matrix simulation model with high order and state space is established considering the speed variation, as shown in Fig.A1. A dynamic modeling method for MVDC generator sets is constructed with speed regulation characteristics of prime movers. Taking a gas turbine generator unit as an example, the dynamic simulation model is established in Matlab/Simulink software, as shown in Fig.A2. The output electromagnetic torque of the MVDC generator and its excitation system is introduced into the gas turbine and its speed governing system, and the output rotational speed is connected to the MVDC generator and its excitation system, which achieves strong coupling numerical simulation calculations for the prime mover’s speed regulation and the generator excitation’s voltage regulation.
The dynamic performance of a real system under the no-load sudden load condition is simulated, comparing the experimental data from actual MVDC gas-turbine power generation units under a sudden load condition of 20%. The comparison reveals consistent rotational speed output waveforms (Fig.A1) and DC voltage output waveforms (Fig.A2). Key dynamic performance indicators are analyzed, including transient speed regulation rate, transient voltage regulation rate, rotational speed, and voltage recovery time. The maximum relative error between the simulation and the experiment is 2.91%, verifying the accuracy of the dynamic performance simulation analysis of the MVDC generator set model.
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Received: 31 March 2023
Published: 07 June 2024
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2024, Vol. 39 
