【作者】 丁涛；

【导师】 丁坚勇；

【作者基本信息】 武汉大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 准同期并列是电力系统中一项重要操作。准同期并列必须平滑而又快速。发电机电压与系统电压之差必须足够小，避免合闸时发电机电枢绕组电流过大，对发电机联轴系统产生冲击。这就要求并列合闸时断路器两侧电压的幅值差、频率差和相角差都足够小。 基于单片机的自动准同期装置是最具代表性的并列装置。 本文中研制的基于单片机的自动准同期装置能够直接精确测量两侧的电压。两侧的电压差决定了发电机的调节方向和幅度。可以通过键盘灵活地把整定值设定得十分精细。频率差决定了发电机的转速需要增加还是减少。电压幅值差决定了发电机电压是需要升高还是降低。 在发电机机端的电压值和频率值满足要求的前提下，两侧电压的相位差在断路器合闸瞬间应尽接近于零。本装置中采用了作者设计的一种精密测量相位差的电路。装置的相关硬件和软件设计保证了合闸瞬间的相位差小于允许合闸相角差。 对两电压的电压差、频率差和相位差的严格控制确保平滑、迅速地将发电机并入电网。 装置具备在准同期过程开始之前检测两侧电压的相序的功能，并且能够在合闸后及时在线测量动作回路的合闸时间。每次将在线测得的合闸时间存入EEROM，作为下次确定越前时间的参考。更多还原

【Abstract】 Quasi-synchronizing parallel is an important operation in the power system. Quasi -synchronization should parallel synchronous generator into the power system smoothly and rapidly. The voltage between the system and generator must be small enough to ensure minor current in the armature winding of generator, avoiding the impact to the coupling shaft. This means the difference of magnitude, frequency and phase of the voltages between the two sides of breaker must be small enough. Microprocessor-based automatic quasi-synchronizing device is the most representative kind of paralleling device.The microprocessor-based automatic quasi-synchronizing device designed in the paper measures the magnitude and frequency of the generated voltage of synchronous generator and of the power system directly and accurately. The measured quantities are compared and the result of the comparison determines the adjustment of the synchronous generator. The criteria of comparison can be set by the keyboard finely and flexibly. The differential frequency determines whether to increase or to decrease the rotate velocity of the synchronous generator and the differential voltage determines the adjustment of the generated voltage.The differential phase must be zero at the moment of closing breaker when the frequency and magnitude of the synchronous generator is satisfied. The device detects the differential phase accurately by a new circuit designed by author. The design of the hardware and software ensures the breaker closing at the just moment of zero- differential phase.Closing the breaker under the rigid condition of the magnitude, frequency and differential phase ensures paralleling the synchronous generator into the power system smoothly and rapidly without undesired large strike closing current.The device detects the phase order of both side of voltages before the beginning of the quasi-synchronizing process and detects the closing time interval of the closingcircuit on line. The closing time is stored into the EEROM of the device as the reference to adjust the ahead-time of the next paralleling operation adaptively.更多还原