考虑原动机调速特性的MVDC发电机组动态仿真模型

doi:10.19595/j.cnki.1000-6753.tces.230383

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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, which is conducive to the flexible configuration of the marine power system, It represents the future development direction of ship integrated power systems at home and abroad. In MVDC integrated power systems, in order to improve fuel operation economy and power supply reliability, multi machine parallel power supply is commonly used. If a single unit trips, it will trigger a dynamic process of sudden load application to the units on the grid. At this time, maintain the stability of the grid voltage is one of the issues that need to be focused on at the beginning of the design of the MVDC integrated power system, which is closely related to the speed regulation performance of the prime mover and the voltage regulation performance of the generator. Therefore, it is necessary to establish a dynamic simulation model of an MVDC generator unit that takes into account 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 and unifies the electrical angular velocity input interface of the mathematical models of twelve-phase synchronous generators and their three-phase exciters, establishes a variable coefficient matrix high order state space simulation model that takes into account the speed variation, as shown in Figure 1. And then proposes a dynamic modeling method for MVDC generator sets that considers the speed regulation characteristics of prime movers. Taking a certain type of gas turbine generator unit as an example, a dynamic simulation model is established in MATLAB/Simulink software, as shown in Figure 2. By introducing the output electromagnetic torque of the MVDC generator and its excitation system into the gas turbine and its speed governing system, and then connecting the output rotational speed of the gas turbine and its speed governing system to the MVDC generator and its excitation system, strong coupling numerical simulation calculation of the prime mover speed regulation and the generator excitation voltage regulation can be achieved.
The dynamic performance of a real system that may occur under the no-load sudden load condition of grid units is simulated, and compared with the experimental results of actual MVDC gas turbine power generation units under sudden load condition of 20%. The comparison of rotational speed output waveforms is shown in Figure 1, and the comparison of DC voltage output waveforms is shown in Figure 2. It can be seen that the simulation and experimental results are basically consistent, verifying the effectiveness and accuracy of the model. For the dynamic performance indicators such as transient speed regulation rate, transient voltage regulation rate, rotational speed, voltage recovery time, etc. that are key concerns of the MVDC integrated power system, the maximum relative error between the simulation results and the experimental results is 2.91%, which more effectively verifies the accuracy of the dynamic performance simulation analysis of the MVDC generator set model.

This paper proposes a modeling method for MVDC generator sets based on the consideration of the speed regulation characteristics of prime movers, and establishes corresponding dynamic simulation models for twelve-phase rectifier generators and three-phase excitation motors. The simulation results are in good agreement with experimental results based on actual operating parameters, verifying the correctness of the proposed method and the accuracy of the model used. Based on the dynamic performance simulation and experimental data of a scientific research prototype, it is shown that MVDC reduces the requirements for the transient speed regulation performance of the prime mover, and further demonstrates that MVDC has more advantages compared to MVAC integrated power systems. The simulation models and test conditions can provide support for promoting the engineering process of MVDC integrated power systems.

Key words： Speed characteristics of prime mover MVDC generator set twelve-phase rectifier generator dynamic simulation model

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TM314

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	Yi Xinqiang
	Wang Dong
	Liu Haitao
	Zhao Haoran
	Yuan Zhifang

Cite this article:

Yi Xinqiang,Wang Dong,Liu Haitao等. Dynamic Simulation Model of MVDC Generating Set Considering the Speed Regulation Characteristics of Prime Movers[J]. Transactions of China Electrotechnical Society, 0, (): 239616-239616.

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