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  • 技术论文:A Hybrid Multiport Modular Multilevel DC-DC Converter For Offshore Wind Farms Application

    Abstract—Offshore wind farms connected with HVDC transmission line is a promising solution to bring the power to shore and assure the system efficiency. A DC-DC converter with high step ratio is required for such application. The modular multilevel converter (MMC) for transformer-less DC-DC converter application is regarded as an alternative solution to replace the two-stage DC-AC-DC conversion. A hybrid multiport modular multilevel DC-DC converter is proposed in this paper, which have one high voltage port and multiple low voltage ports. The low voltage ports can be connected to the dc output of wind turbines. The bidirectional power flow is realized by controlling the arm voltages. The proposed converter has a lower circulating currents as compared to the single-port MMC DC-DC converter. By using the full bridge submodules (FBSMs), the converter also has DC fault blocking capability. 


  • 技术论文:Modeling and Real-time Simulation of Modular Multilevel Converters using RT-LAB

    Abstract—Modular Multilevel Converter (MMC) is composed by hundreds of sub-modules (SMs). Such a large scale power electronic switches and power nodes will become very difficult to solve in the process of real-time simulation of the electromagnetic transient. These switches will occupy a very large amount of calculation, in this case, still use a large step (microsecond) simulation has been unable to meet the sub-module operation during dynamic  response, especially when a short circuit fault occurs in the bridge arm, the electromagnetic transient process of the system cannot be accurately reflected. In order to solve the problem, this paper presents a simplified sub-module model and an equivalent valve model based on state-space node solver implemented in FPGA for the real-time simulation. This method can effectively reduce the power nodes and decrease the computation time, and improves the accuracy of the simulation. In addition, the multi-rate simulation of RT-LAB and the test method of hardware-in-the-loop (HIL) are explained in this paper. Finally the simulation results show that the effectiveness of the proposed method.


  • 技术论文:Real Time Digital Simulation and HIL Test of Xiamen MMC-HVDC Demonstration Project

    Abstract—Xiamen MMC-HVDC demonstration project is the first real bipolar MMC-HVDC project in the world. Generally, before field commissioning of the project, the performance of control and protection system must be verified using hardware-in-the-loop (HIL) real time digital simulation. This paper presents the configuration and performance of a
    HIL test platform based on RT-LAB. Results from the HIL test platform and the field test are presented in this paper. By way of comparison between the results of HIL test and field test, the validity of RT–LAB HIL test platform is confirmed.


  • 技术论文:一种基于RT-LAB的高速电力电子实时彩世界官网网址方法研究

    为了实现高速电力电子系统的实时彩世界官网网址,提出了一种基于现场可编程门阵列(FPGA)的高速可重构实时彩世界官网网址系统设计方法。本文通过FPGA硬件解算器建立了高速电力电子电路彩世界官网网址模型。并且应用RT-LAB实时彩世界官网网址平台以及配套的FPGA开发工具,对光伏逆变器并网系统模型进行实时彩世界官网网址验证。FPGA硬件彩世界官网网址器针对高速电力电子系统进行彩世界官网网址,配合修改该节点分析法[1]以及高速开关器件的普约维奇等效法[2],为大规模高速高精度实时彩世界官网网址的提供了可靠的运行环境。同时为了验证系统有效性,本文研究了光伏并网逆变器的工作原理,利用基于FPGA的高速电力电子彩世界官网网址系统搭建了光伏逆变器测试系统。本文通过光伏并网逆变器为例建立了基于FPGA的实时彩世界官网网址系统,包括电网模型、高速boost升压电路、高速逆变器以及并网升压变压器模型。彩世界官网网址结果验证了FPGA高速硬件彩世界官网网址系统在光伏入网系统实时彩世界官网网址中的有效性及准确性。


  • 技术论文:一种电动汽车入网的实时彩世界官网网址及测试平台

    伴随着新能源汽车的普及,电动车入网技术(V2G技术)的关注度不断提高。如何对于电动汽车入网的特点进行彩世界官网网址研究,如何在前期对控制策略进行实时测试,是亟待解决的关键问题。本文针对AC/DC结合DC/DC结构的充放电控制器,提出一种充放电控制策略。并设计完整的实时硬件在环彩世界官网网址平台对充放电控制器进行开发测试。该平台包括电网到电池的彩世界官网网址模型,可模拟整个V2G的充放电过程。此外该模型还能够模拟电网故障、电池故障。以测试控制器的故障处理能力。该平台具有通用性,为V2G控制器开发测试提供便利。


  • 技术论文:一种SVG主从控制方法的研究

    在电力系统中,为保证供电的可靠性及稳定性,一般会采用经断路器隔离的分段母线供电方式,通常采用两条母线各配置一套SVG的结构方案来补偿母线无功。当母联合闸时,两套SVG同时运行会出现互补震荡的问题,导致系统不稳定。针对上述运行工况,提出双SVG主从控制共同补偿母线无功的控制方案,即两套SVG控制器通过光纤直连的方式并联对同一母线进行补偿。文章详细分析了主从控制的运行原理,对SVG的响应速度和补偿效果进行了详细的分析,通过纯数字模型及RTLAB硬件在环彩世界官网网址平台,分析控制策略的正确性及可行性。结果表明:两套控制器主从并列运行的方式,既可以增大SVG的补偿容量,又能保证其响应速度在控制在30ms以内,能够很好的解决单套SVG容量不足及同时互补震荡的问题,具有较强的使用价值。

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