| 引用本文: | 孙宏宇,张沛超,杜炜,刘学智,何国鑫.基于功率守恒原理的电热联合系统潮流计算方法[J].电力自动化设备,2020,40(11): |
| SUN Hongyu,ZHANG Peichao,DU Wei,LIU Xuezhi,HE Guoxin.Power flow calculation method of integrated electricity and heat system based on power conservation principle[J].Electric Power Automation Equipment,2020,40(11): |
|
| 摘要: |
| 潮流计算是对电热联合系统进行稳态分析的基础，热电联供机组等耦合元件引起的多能流耦合使得联合潮流计算复杂化。现有联合潮流计算方法中，整体法存在计算效率不高和病态雅可比矩阵的问题，而对分解法的相关研究缺乏收敛性质的分析和应对迭代发散的解决方案。为改进上述问题，针对耦合元件存在于热电平衡节点的联合系统，基于功率守恒原理推导了使用分解法时热网和电网平衡节点功率的迭代式，据此分析了分解法的收敛性质，并指出了迭代式的不动点即为平衡节点功率的解析解，进而提出了一种求解联合潮流的新方法。最后，通过设计电热联合系统算例证明了所提方法不但具有快速性与准确性，能够解决分解法存在的发散问题，而且可以用于热电耦合元件参数可行域估计。 |
| 关键词: 电热联合系统 潮流计算 功率守恒原理 不动点 收敛性 |
| DOI：10.16081/j.epae.202008013 |
| 分类号:TM744;TK01 |
| 基金项目:国家重点研发计划项目(2018YFB0905000) |
|
| Power flow calculation method of integrated electricity and heat system based on power conservation principle |
|
SUN Hongyu1,2, ZHANG Peichao1,2, DU Wei3, LIU Xuezhi1,2, HE Guoxin3
|
|
1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;2.School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3.NARI Technology Co.,Ltd.,Nanjing 210000, China
|
| Abstract: |
| Power flow calculation represents the basis to analyze the steady-state operation of an integrated electricity and heat system. The multi-energy flow coupling caused by CHP(Combined Heat and Power) and other coupling components results in complicated calculation of combined power flow. Regarding the existing combined power flow calculation approach, the integrated approach suffers from the issues of huge computation burden and ill-conditioned Jacobian matrix. However, the decomposed approach is difficult to proof the algorithm convergence, and its iterative divergence issue cannot be well addressed. Hence, addres-sing these issues is of interest. For the system in which the slack node is connected with coupling units, the iterative formula of the slack nodes that respectively belong to heat network and the electricity network is derived according to the power conservation principle. Based on this, the convergence property of the decomposed method is analyzed, and the iterative fixed point is considered as an analytical solution of the slack node. Subsequently, a new method of combined power flow analysis is developed. Finally, simulative results of integrated electricity and heat systems prove that the proposed approach is efficient and accurate. It can also be used to solve the divergence problem of decomposition approaches. In addition, the feasible region of coupling parameters is estimated. |
| Key words: integrated electricity and heat system power flow calculation power conservation principle fixed point convergence |
