A double-layer control method for transmission network voltage based on active and reactive power coordination optimization

Abstract

The invention relates to the technical field of power system operation control, and discloses a double-layer voltage control method for a transmission network based on active and reactive power coordination and optimization, including constructing an active and reactive power coupling model of dispatchable resources of the transmission network; constructing an AC power flow of a line grid The non-convex power flow constraint equation is transformed into a second-order cone optimization problem that can be solved by the second-order cone relaxation method; the output limit of the constructed active and reactive power coupling model is combined with the line AC power flow limit obtained by relaxation. The minimization of node voltage deviation and the minimization of dispatching cost are used as objective functions, and the mixed integer second-order cone optimization problem of multi-objective functions is solved to obtain the output value of each equipment; a double-layer voltage control model is constructed to realize the control of transmission network voltage. Compared with the prior art, the present invention extends the second-order cone relaxation method of the AC power flow to the voltage control of the transmission network, and combines the day-ahead forward-looking scheduling with the intra-day rolling optimization to obtain more accurate scheduling results.

Description

technical field [0001] The invention relates to the technical field of power system operation control, in particular to a double-layer voltage control method for a transmission network based on active and reactive power coordination optimization. Background technique [0002] With the rapid development of my country's economy, the economic structure is increasingly showing the characteristics of speed change, structural optimization, power conversion and so on. my country's goal is to build a developed economy, so the economic development model needs to be transformed. In response to the country's call for stable economic transformation and development, we should focus on the issue of economic waste in the energy sector. The power generation and transmission links are the foundation of the national power supply business. Under the new economic situation, the research on rational planning and dispatching is particularly important. [0003] For the method of joint active and...

AI Technical Summary

Problems solved by technology

[0007] 1. At present, active and reactive power coupling dispatching is mainly used in distribution network, and active and reactive power coupling dispatching is rarely considered in transmission network

[0008] 2. The control object should consider various aspects such as safety and economy, and there are conflicts between some control objectives

From the perspective of decision-making, the contradiction between active and reactive power scheduling cannot be better resolved

[0009] 3. The combined active and reactive power dispatching of the single-layer model can neither take into account the economy and safety of the optimization target, nor can it coordinate the various devices with different time constants in the power system.

Images