The voltage on bus bars of the main switchboard of the ro-ro ship electrical power system during a sea voyage

The dataset is part of the research results on the quality of supply voltage on bus bars of the main switchboard of the ship's electrical power system in different states of ship exploitation. The attached dataset contains the measurement results carried out onboard a ro-ro ship during a sea voyage. The ro-ro ship is equipped in three-phase, three-wire electrical power systems. The ship's electrical power plant consists of two free-standing generators 1000 kVA each and two-shaft generator 1500 kVA each (see Figure 1). The nominal voltage on bus bars of the main switchboard was 400 V with a frequency equal to 50 Hz. The voltage of 220V has been obtained by means of a transformer. The single shaft generator has been used during sea voyage as well as during maneuvering as an energy source of a bow thruster. The each of shaft generators could not work in parallel with other electrical energy sources, excluding short switching time (roughly 2 seconds). The shaft generators have been connected with the remaining system only with the help of a simple circuit breaker. It has been possible thanks to adjusting screw propellers using. The voltage waveforms on bus bars of the main switchboard were recorder with the digital measuring system, which allows the simultaneous measurement of three phase-to-phase or two-phase voltages. The initial conditioning of the input signals is carried out by optoisolation amplifiers and a low-pass filter module (antialiasing). The formation of the output digital signal from the analog signal takes place in the a/d converter with a resolution of 16 bits and a sampling rate of up to 20 kS/s. Using three channels at the same time allows the maximum sampling rate of 6.6 kS/s. The block diagram of the digital measuring system is shown in Figure 2. The files contain voltage waveforms of the output of a/d converters in [V], in three phases for 400 V network. The attenuation and offset of the measuring path are equal to 134.0123 [V / V] and -0.0175 V, respectively. The sampling frequency is inserted in the first row of the attached files. The data recorded during a sea voltage is included in the file named ro_ro_voyage.TXT.The file described as ro_ro_transition.TXT contains measurement data, which was recorded during the generator G1 operation, after 2 s the shaft generator SG1 is switching off and after 20 minutes the generator G2 is on. Figure 1. The electrical power plant configuration on the ro-ro ship Figure 2. The block diagram of the digital measuring system

本数据集属于船舶电力系统主配电板汇流排供电电压质量相关研究成果，研究覆盖船舶不同运行工况。本次附属数据集包含某滚装船（ro-ro ship）在海上航行期间的船载实测数据。该滚装船搭载三相三线制电力系统。该船的电力电站由两台单机容量1000 kVA的独立发电机，以及两台单机容量1500 kVA的轴带发电机组成（详见图1）。主配电板汇流排的额定电压为400 V，额定频率为50 Hz；220 V电压通过变压器（transformer）转换得到。单台轴带发电机在海上航行及船舶机动作业阶段，均用作船首侧推器的供电电源。除极短的切换时长（约2秒）外，各轴带发电机均不得与其他电源并联运行。轴带发电机仅通过简易断路器与其余电力系统相连，该连接方案依托可调螺旋桨的配套设计得以实现。主配电板汇流排的电压波形由数字测量系统记录，该系统可同时测量三相线电压或两相电压。输入信号的初始调理环节通过光隔离放大器（optoisolation amplifiers）与低通滤波模块（抗混叠滤波器，antialiasing filter）完成。模拟信号转换为数字输出信号的过程由分辨率16位、最高采样率可达20 kS/s的模数转换器（a/d converter）实现。若同时启用三个测量通道，则系统最大采样率为6.6 kS/s。数字测量系统的框图详见图2。数据文件包含400 V三相电网的模数转换器输出电压波形，单位为[V]。测量通路的衰减系数为134.0123 [V/V]，系统偏移量为-0.0175 V。采样频率已嵌入附属数据文件的第一行。海上航行期间采集的数据存储于文件ro_ro_voyage.TXT中。文件ro_ro_transition.TXT包含发电机G1运行期间的实测数据：运行2秒后断开轴带发电机SG1，20分钟后启动发电机G2。图1 滚装船电力电站配置示意图；图2 数字测量系统框图