Research On Operation And Control Optimization Of Cascade Pumping Station Water-Delivery System Based On Dynamic Balance

This article is aimed at the large cascade pumping station water-delivery system, based on the theory of the large system decomposition and coordination, and adopts the hydraulics simulation method, so as to build a set of relatively complete cascade pumping station water system optimization operation and control theory and application method based on the dynamic balance, thus determine the dynamic balance of the optimizing operation and control scheme. What’s more, it effectively solved the optimal operation problems in the dynamic process of cascade pumping station water system by the active control of flow and water level in the protection of water safety conditions. After the application practice in Hanzhuang Canal of South-to-north Water Transfer Project, it proved that the achievements can effectively improve the level of systematic water-delivery control, provide technical support for the system safety and economic operation. In the meantime, the achievements can be extended and applied in similar projects. The main research achievements are as follows:1. The article put forward the cascade pumping station water system optimization operation and control theory based on the dynamic balance, divided optimizing operation scheduling into two parts:operation optimization and optimum control, which are correlate with each other, and established the mutual coupling optimization model. What’s more, it put forward the rolling forward model solving and coupling mode: water delivery tasks and goals--operation optimization--control optimization--hydraulic simulation--optimization evaluation--final decision. Therefore, it concluded the optimizing operation and control scheme, and realize the current time operation and control optimization of the cascade pumping station water-delivery system.2. Based on the systematic analysis of the cascade pumping station water-delivery system, it divided the system into pump station subsystem and water-delivery subsystem, which are closely related, and put forward the definition and expression of the pump station, water-delivery subsystem efficiency and cascade pumping station water-delivery system efficiency, therefore constructed the theoretical basis for the operation optimization of the system.3. It put forward the calculation theory and method of the station pumping unit efficiency. Based on the existing pump model device test data, it built fast and reliable calculation method of pumping unit performance, which could gain pumping unit performance surface of high accuracy and provide basic data for the economic optimization in the pumping station.4. It constructed the hydraulics numerical simulation model of complex water-delivery system between the cascade and calculated the characteristics of constant flow and unsteady flow state in the water-delivery process. It analyzed the flow-water-storage quantity relationship under unsteady flow operation state between the cascade, made numerical analysis and simulation research of the hydraulic transition process caused by the station flow adjustment and accident, and predicted the regulation of hydraulic parameters under different water conditions, such as water level, velocity and flow rate. Meanwhile, the model could provide simulation platform for the operation and control scheme, verify the feasibility of operation and control scheme and offer the basis for station optimization operation and control scheme.5. It built single-stage pump station efficiency optimization model and time economic optimization model (short-term and long-term), and adopted the dynamic planning algorithm based on the discrete interval to finish the calculation. Aiming at the the optimal time efficiency and economic benefits, it analyzed the theoretical energy saving space of single-stage pump station operation, determined the corresponding pumping station optimizing operation scheme, and provided basis of cascade pumping station water-delivery system optimal operation.6. It built cascade pumping station water system efficiency and time economic operation optimization model based on hydraulic static balance (short-term and long-term), and adopted the dynamic planning algorithm based on the discrete interval to finish the calculation. Aiming at the the optimal time efficiency and economic benefits, it analyzed the theoretical energy saving space of cascade pump station operation, and respectively worked out hydraulic optimization scheme between the cascade and the corresponding optimizing operation scheme of each pump station.7. Based on the analysis of water-delivery control system of cascade pumping station, it put forward the suitable storage quantity control mode, built the corresponding control algorithm and model, and simulated the control process. Finally, it determined the optimal control scheme, realized the current,automatic and accurate control of water level and flow between the cascade, ensured the safety of water delivery, and provided the premise condition for the realization of cascade pumping station water-delivery system optimization operation.