基于RTDS的双单元背靠背直流输电系统仿真与研究
发布时间：2018-11-09 15:21
【摘要】：随着电力系统的发展,新型电力系统元件如模块化多电平换流器等的不断出现以及西电东送的步伐加快,使得交流电网的送电距离越来越远,交直流混合运行的电网结构日趋复杂和庞大,而对电网运行安全性的要求也在逐步提高,数字仿真是研究复杂电力系统的一种经济便捷的有效方式,也是电力系统运行安全、控制策略评估的一个不可或缺的环节。本文以鲁西背靠背直流工程中将两种不同类型的换流单元放置于同一个换流站中为背景,在实时数字仿真器(Real Time Digital Simulator,简称RTDS)的仿真环境中,对同时包含柔性直流单元与常规直流单元这两种不同单元的混合式背靠背换流站的主结构进行建模,并通过RTDS的CBuilder功能将工程中实际的控制程序转化为仿真模型中的自定义控制元件,从而实现了一个可以脱离外部控制装置独立运行的全数字化闭环实验系统。全数字形式的仿真模型因为不需要外部控保装置所以其具有硬件成本较低、实验系统搭建方便的优点,使用CBuilder功能进行自定义元件也能有效的减少仿真计算资源的占用,方便控制逻辑在不同的仿真环境中进行移植。为了验证本文开发的自定义控制元件的有效性,使用该全数字仿真模型进行了数项实验,并将实验波形分别与带实际控制保护装置的闭环实验系统和现场运行获得的波形进行对比。结果表明,本文开发的控制元件与实际的装置拥有相同的控制效果,适用于控制效果、故障特性与保护策略等方面的仿真及研究。
[Abstract]:With the development of power system, the emerging of new power system components such as modularized multilevel converters, and the acceleration of power transmission from west to east, make the power transmission distance of AC power grid more and more distant. The power network structure of AC / DC hybrid operation is becoming more and more complex and huge, and the requirement of power network operation security is also gradually raised. Digital simulation is an economical, convenient and effective way to study complex power system, and it is also the power system operation safety. The evaluation of control strategy is an indispensable part. In this paper, two different types of converter units are placed in the same converter station in Luxi back-to-back DC engineering, and in the simulation environment of real-time digital simulator (Real Time Digital Simulator, (RTDS). The main structure of a hybrid back-to-back converter station with two different elements, flexible DC unit and conventional DC unit, is modeled. Through the CBuilder function of RTDS, the actual control program in engineering is transformed into a self-defined control element in the simulation model, and a fully digital closed-loop experimental system which can run independently from the external control device is realized. The full-digital simulation model has the advantages of low hardware cost and convenient construction of the experimental system because it does not need external control and protection devices. The use of CBuilder function for custom components can also effectively reduce the use of simulation computing resources. Convenient control logic is transplanted in different simulation environments. In order to verify the validity of the self-defined control element developed in this paper, several experiments are carried out using the full-digital simulation model. The experimental waveform is compared with the closed loop experimental system with actual control protection device and the waveform obtained from field operation. The results show that the control element developed in this paper has the same control effect as the actual device, which is suitable for the simulation and research of control effect, fault characteristics and protection strategy.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1
本文编号：2320793
[Abstract]:With the development of power system, the emerging of new power system components such as modularized multilevel converters, and the acceleration of power transmission from west to east, make the power transmission distance of AC power grid more and more distant. The power network structure of AC / DC hybrid operation is becoming more and more complex and huge, and the requirement of power network operation security is also gradually raised. Digital simulation is an economical, convenient and effective way to study complex power system, and it is also the power system operation safety. The evaluation of control strategy is an indispensable part. In this paper, two different types of converter units are placed in the same converter station in Luxi back-to-back DC engineering, and in the simulation environment of real-time digital simulator (Real Time Digital Simulator, (RTDS). The main structure of a hybrid back-to-back converter station with two different elements, flexible DC unit and conventional DC unit, is modeled. Through the CBuilder function of RTDS, the actual control program in engineering is transformed into a self-defined control element in the simulation model, and a fully digital closed-loop experimental system which can run independently from the external control device is realized. The full-digital simulation model has the advantages of low hardware cost and convenient construction of the experimental system because it does not need external control and protection devices. The use of CBuilder function for custom components can also effectively reduce the use of simulation computing resources. Convenient control logic is transplanted in different simulation environments. In order to verify the validity of the self-defined control element developed in this paper, several experiments are carried out using the full-digital simulation model. The experimental waveform is compared with the closed loop experimental system with actual control protection device and the waveform obtained from field operation. The results show that the control element developed in this paper has the same control effect as the actual device, which is suitable for the simulation and research of control effect, fault characteristics and protection strategy.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1
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