水电富集地区水、火电运行特性及有功功率协调控制（二）不同调节能力区域之间的协调机制

异步联网方式下的中国西南电网转动惯量显著减小，抗有功功率扰动能力大幅下降，对电网稳定运行带来更多挑战。首先，建立了偏离计划潮流（USF）和多个控制区域的区域控制偏差（ACE）的关联模型，阐述了不同频率偏差下自然频率特性系数和机组调节过程对USF的影响，分析了在不同调节能力区域之间构建一套协调机制的必要性，然后，提出了满足跨层级、多区域架构下有功功率协调控制需求的设计原则，建立了考虑机组调节区间、断面可用传输容量等约束条件的备用共享容量计算模型，进而，提出了正负备用相互置换和故障发生后备用互济的实现方式。最后，通过算例仿真结果验证了所提机制与方法的有效性。

Operation Characteristics and Active Power Coordinated Control of Hydropower and Thermal Power in Hydropower-rich RegionsPart Two Coordinated Mechanisms for Areas with Different Regulation Capacities

In asynchronous interconnection mode, the rotational inertia of the southwest power grid in China reduces significantly, and its ability of counteracting active power disturbance significantly decreases. These bring more challenges to the operation stability of the power grid. Firstly, the correlated model of unscheduled flows (USFs) and area control errors (ACEs) of multiple control areas is established. This paper describes the impacts of natural frequency characteristic coefficient with different frequency deviations and regulation process of units on USF, and analyzes the necessity of constructing a coordination mechanism among areas with different regulation capacities. Then, the principle of design is proposed to meet the demand of active power control in cross-voltage-level and multi-area structures. This paper establishes calculation models of volume of reserve sharing considering the constraints of the regulation range of units, available transfer capacity of cross-sections, etc. Further, the implementation of interchange between positive and negative reserves and mutual reserve support after a contingency is proposed. Finally, the simulation results verify the effectiveness of the proposed mechanism and method.