Abstract
Energy router is an emerging device based on power electronic technology, which can realize the flexible distribution of electric energy in the power system. Therefore, the use of energy routers to improve the operating conditions of the power system not only has broad development prospects, but also brings economic benefits. In this regard, this paper proposes a steady-state model of a single energy router and considers the loss of the DC/DC transformer, establishes a power flow equation with multiple energy routers, and proposes a distribution network power flow alternate iteration that takes into account multiple energy routers Calculation method. A case study of an improved IEEE-33 system with multiple energy routers under different working conditions is carried out. The calculation results show that the alternate iterative power flow calculation method used in this paper is effective and feasible, and it reasonably reflects that the network analysis model with multiple energy routers can achieve stable operation, and it can improve the node voltage and reduce the active power loss of the grid. It makes the operation of the distribution network more flexible.
Highlights
Energy is one of the foundations for the survival and development of human society, and the problem of energy shortage is a key issue that people have paid attention to in recent years
In the traditional power system, power regulation mainly relies on the generator set, which is mostly controlled in a centralized manner by means of electric energy coordination
This paper proposes a general analysis method for power flow calculation of multi-energy router distribution network considering the losses of energy routers
Summary
Energy is one of the foundations for the survival and development of human society, and the problem of energy shortage is a key issue that people have paid attention to in recent years. Only has the function of voltage conversion but not power adjustment and distribution, which means that a new type of power transformation equipment is urgently needed to meet the needs of energy Internet construction [4] For this reason, the FREEDM Center of North Carolina State University in the United States proposed the concept of energy routers. It is necessary to discuss in depth the power flow calculation method of the distribution network with multiple energy routers to lay the foundation for the flexible operation and optimized control of the power grid with multiple energy routers. Compared with the unified solution method, the alternating iteration method is easier to implement, less computationally expensive, and more efficient In this regard, this paper proposes a general analysis method for power flow calculation of multi-energy router distribution network considering the losses of energy routers. The basic steady-state calculation model of a single energy router is established, and the loss model of energy router is taken into account; Secondly, based on the steady-state calculation model of a single energy router, the power flow equation with multiple energy routers is derived; an alternating iteration method is proposed to solve the power flow problem with multiple energy routers; a case study of the improved IEEE-33 system is carried out to verify the effectiveness of the proposed model
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