基于统一潮流灵敏度的电-气-热综合能源系统安全控制策略

Security control strategy of an electricity-gas-thermal integrated energy system based on uniform power flow sensitivity

为实现更高的能源利用率,分离的电-气-热系统逐渐向耦合的综合能源系统(Integrated Energy System,IES)转化。然而随着IES中耦合关系和运行方式日趋复杂,IES内各子系统的运行安全性问题面临新的要求。首先构建了IES中电-气-热网的独立稳态潮流模型,并列写为IES统一潮流方程。利用多能流计算过程中的雅可比矩阵及变量间的耦合关系,计算IES中电压、气压、支路潮流、节点温度对控制变量的综合灵敏度矩阵。定量描述IES系统内部跨能源品类的控制变量及状态变量间的关系。然后,利用综合灵敏度矩阵寻求对IES中不安全点最具控制效率的参数进行调整,使其满足系统安全运行要求。最后,通过IES39-26-44算例对所提方法进行分析和验证,结果证明了其正确性和有效性。

To improve the utilization of energy,separate electric power,gas and thermal systems are gradually transformed into an Integrated Energy System(IES).However,with the increasingly complex coupling relationship and operational mode in an IES,each subsystem in the IES faces new requirements for secure operation.First,the steady power flow equations of independent electricity,gas and thermal networks are formulated and integrated into a uniform equation of an IES.Based on the Jacobian matrix of multi energy flow and analysis of the coupling relationship among variables,the comprehensive matrix of sensitivities of voltage,air pressure,branch current,node temperature to the control variables in the IES is calculated.The relationship between control variables and state variables of different energy categories in the IES is described quantitatively.Then,based on the comprehensive sensitivity matrix,the parameters that are the most sensitive to the unsafe points in the IES are adjusted to meet the requirements for the safe operation of the system.Finally,an IES39-26-44 example is used to analyze and verify the proposed method and the simulation results verify the correctness and effectiveness of the proposed method.