电力系统全过程动态仿真中的机炉协调控制系统模型研究

Modeling of Boiler-turbine Coordinated Control System in Coal-fired Power Plants for Power System Unified Dynamic Simulation of Transient, Medium-term and Long-term Stabilities

机炉协调控制系统(coordinated control system,CCS)是火电机组满足电网负荷需求和保证机组本身稳定运行的重要控制措施。在分析机炉协调控制系统原理和控制方式的基础上,提出了一种适于电力系统机电暂态及中长期动态全过程仿真的机炉协调控制模型,并在电力系统全过程动态仿真程序进行编程实现。通过模型参数值的设置,该模型可以灵活模拟炉跟机、机跟炉、协调控制、直接能量平衡等火电厂机炉控制中的常见组态方式。采用两个仿真算例说明了不同CCS控制方式对机组功率的影响,以及CCS在与频率动态特性相关的电力系统动态仿真中的作用。

Boiler-turbine coordinated control systems （CCS） plays an important role in satisfying the load demand of power system and ensuring the stable operation of coal-fired generating plants. Based on the analysis of the principle and control modes ofCCS, a new CCS model was proposed, which could be applied to power system electro-mechanical transient, medium-term and long-term dynamics simulation. By setting appropriate parameters in model flexibly, the model can be used to simulate several kinds of control modes of CCS, such as, boiler following, turbine following, coordinated control, direct energy balance control, etc. This model was developed in the power system unified dynamic simulation program. Two simulation cases show the influence of different mode of CCS on the mechanical power output of generating units and the effect of CCS model on the power system simulation related to power-frequency dynamics.