计及无功耦合的多分区关联协调二级电压控制方法

Coordinated Secondary Voltage Control Method Considering Reactive Power Coupling Among Multiple Correlated Zones

为克服区域间无功耦合对二级电压控制产生的影响,以国内自动电压控制主站集中控制模式为前提,提出一种计及区域间无功耦合的协调二级电压控制方法。该方法在原有协调二级电压控制二次规划模型的目标函数和约束条件中分别引入区域外受控发电机无功调节量,建立多分区关联协调二级电压控制模型。借助非合作博弈的思想,将这个问题描述为古诺模型,并采用内点法求解多分区关联协调二级电压控制的古诺模型获得纳什均衡解。这个问题的纳什均衡解既保留了各个区域独立控制又实现了各控制区域之间的协调。在新英格兰39节点系统和某省级1 004个节点电网上的稳态仿真结果表明,所提方法克服了中枢母线电压在调控过程中的振荡,证明其能有效解决全网各区域二级电压控制之间的协调问题。

To eliminate the reactive power coupling among controlled zones in coordinated secondary voltage control （CSVC）, a novel CSVC method considering reactive power coupling based on the centralized control structure of AVC system in China was proposed. Reactive regulations of controlled generators outside were introduced into objective and constraints of the original quadratic model to establish a new CSVC model considering reactive power coupling among multiple correlated zones. According to non-cooperative game theory, the problem of CSVC considering reactive power coupling among multiple correlated zones could be described as Cournot model. And Nash equilibrium, the solution of Cournot model, could be found by an algorithm to solve all quadratic programming models simultaneously based on interior-point algorithm. The Nash equilibrium means the best control strategy in CSVC which can keep each controlled zone running independent and solve the coordination problem among zones well. Computational results on IEEE 39-bus and a real provincial power system illustrate that control oscillation caused by the reactive power coupling among zones is effectively attenuated, which proves that this new method can solve coordination problems among controlled zones satisfactorily.