基于PCC的水轮机调节及机组监控的研究与应用

发布时间：2018-04-20 19:58

本文选题：PCC + 水轮机调节　；参考：《中原工学院》2014年硕士论文

【摘要】：本文闸述了可编程计算机控制（简称PCC）型水轮机调节系统及机组监控系统的研究与应用，对机组单机孤网、并网一次调频及甩负荷的动态调节特性进行了仿真分析、工程验证。针对机组监控系统NC2000在调试、运行中暴露的问题进行了汇总分析，提出了解决方案。水轮机调节系统涉及引水系统、水轮发电机组、机组有功功率的联动，受电网负荷及频率波动影响，是一个结构复杂、非线性、参数时变的动态系统。本文依据水轮机调节系统工作原理，建立了调节系统动态工况的数学模型，调速器控制器采用PCC调节，，频率调节、功率调节模式下，通过检测反馈的频率偏差、功率偏差实施闭环控制。单机孤网运行时，调速器采用并联PID控制方式，由于抗扰动与稳定性不相容，现场采取优先保证稳定性的控制策略，其它参数通过给定值跟随方式确定，仿真结果及实践验证此方法较好的缓解了抗扰动和稳定性之间的矛盾。并网后调速器采用改进PID控制方式，机组一次调频不具备多次进行的条件，甩负荷试验现场也不宜多次进行，为了给试验提供参考依据，通过仿真手段，从定性和比较的意义上说明了水轮机调节系统调节过程，为现场调节参数的调整、优化提供了技术支持。水轮发电机组计算机监控系统硬件采用基于可编程逻辑控制器（简称PLC）的现地控制单元（简称LCU），软件采用南瑞NC2000，机组出力调节依监控系统指令执行。监控系统采用CLIENT SERVE体系结构，实现了机组监控的“遥信、遥测、遥调”功能及实时不间断监控。调试、运行结果显示，系统控制精度高、数据传输可靠、易维护，具有较高的技术水平。针对特定电网运行模式下机组机端电压高的问题，用电力系统仿真图还原了系统工况，提出了相应解决方案。针对运行中暴露的自动控制方面的问题，从硬件及软件方面提出了解决方案，对水电站自动控制设计及优化有一定的借鉴作用。
[Abstract]:In this paper, the research and application of programmable computer control (PCC-based) hydraulic turbine regulation system and unit monitoring system are described. The dynamic regulation characteristics of single unit isolated network, primary frequency modulation and load rejection are simulated and verified by engineering. The problems exposed in the commissioning and operation of the unit monitoring system NC2000 are summarized and analyzed, and the solutions are put forward. The governing system of hydraulic turbine is a complex, nonlinear and time-varying dynamic system, which involves the connection of diversion system, turbine generator set and active power unit, and is affected by the load and frequency fluctuation of power grid. According to the working principle of the governing system of hydraulic turbine, the mathematical model of the dynamic working condition of the regulating system is established in this paper. The governor controller adopts the mode of PCC regulation, frequency regulation and power regulation, and detects the frequency deviation of feedback by detecting the frequency deviation. The power deviation is controlled by closed loop. The governor adopts parallel PID control mode when the single machine is running in isolation network. Because of the incompatibility between anti-disturbance and stability, the control strategy of ensuring stability is adopted in the field, and the other parameters are determined by the way of following the given value. Simulation results and practice show that this method can alleviate the contradiction between anti-disturbance and stability. After connecting to the grid, the governor adopts the improved PID control mode, the primary frequency modulation of the unit does not have the condition to carry on many times, and the load rejection test site should not be carried out many times. In order to provide the reference basis for the test, the simulation method is adopted. The regulation process of hydraulic turbine regulating system is explained in the sense of qualitative and comparative analysis, which provides technical support for the adjustment and optimization of field regulation parameters. The hardware of computer monitoring system for hydroelectric generating set is based on PLC-based locale control unit (LCU) and the software is Nari NC2000. The unit output regulation is carried out according to the command of monitoring system. The monitoring system adopts CLIENT SERVE architecture, and realizes the functions of "remote signal, telemetry, remote adjustment" and real-time continuous monitoring. The debugging and running results show that the system has high control precision, reliable data transmission, easy maintenance and high technical level. In order to solve the problem of high terminal voltage of generating unit in specific grid operation mode, the system working condition is restored by power system simulation diagram, and the corresponding solution is put forward. In view of the problems of automatic control exposed in operation, this paper puts forward a solution from the aspects of hardware and software, which can be used for reference in the design and optimization of automatic control of hydropower stations.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK730

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