背靠背型电力弹簧分段控制方法研究

A piecewise control strategy for a back-to-back electric spring

背靠背型电力弹簧作为一种负载侧调压的装置,具有无需储能元件、成本低廉的优势,然而现有的控制方法没有充分利用它的运行域。以背靠背型电力弹簧为研究对象,建立了背靠背型电力弹簧多重工作点的数学模型。将电力弹簧的运行域分为了四个部分,并根据各运行域的特点提出相应的分段控制策略。分段控制增大了背靠背型电力弹簧的运行范围,使关键负载在系统电压波动时仍然可以在额定电压下运行,保证了系统的稳定性。通过PSCAD/EMTDC的仿真,证明了所提出的分段控制可以充分利用背靠背型电力弹簧的稳态工作点。

As a load-side voltage regulating device,the back-to-back electric spring has the advantages of no energy storage element and low cost.However,the existing control methods don’t make full use of its operating domain.This paper takes the back-to-back electric spring as the research object and establishes the mathematical model of multiple working points of the spring.The operating domain of the spring is divided into four parts,and a corresponding segmented control strategy is proposed according to the characteristics of each operating domain.Piecewise control increases the running range of the spring,so that the critical load can still run at the rated voltage when the system voltage fluctuates,and the system can run stably.The simulation results of PSCAD/EMTDC also prove that the proposed piecewise control can make full use of the steady-state operating point of the back-to-back electric spring.