For the pricing in the non-convex electricity markets, the various pricing properties including supporting a competitive equilibrium, non-discrimination, cost recovery of participants, and revenue adequacy of the market operator can hardly be simultaneously fulfilled. Current pricing methods cannot balance these properties because there lacks a computationally tractable pricing model that explicitly formulates these properties as objective functions or constraints. In this paper, we propose a pricing optimization model taking prices as decision variables and taking important pricing properties as objective functions or constraints. Based on duality theory, the Karush-Kuhn-Tucker conditions of the self-dispatch problem processed by convex relaxation are extended to construct the constraints related to supporting a competitive equilibrium. Taking advantage of the modeling flexibility, the constraints for non-discrimination, cost recovery, and revenue adequacy are established. The delicately designed pricing optimization model is a linear programming problem with an acceptable computational burden. It applies to the market clearing problem with non-convexity, time-coupling and network transmission characteristics. To be specific, the application of the proposed pricing method for the unit commitment problem is provided. The reasonability, scalability, and tractability of the proposed approach are illustrated in systems with over 2000 buses. Numerical experiments show that the proposed method shows better performance compared with other representative pricing methods.

Based on the energy storage system, users can adjust the electricity load and participate in demand response while meeting their own energy demand. With the gradual advancement of power system reform, the potential benefits of ice storage technology application are increasing. Traditional methods for analyzing the economics of ice storage air conditioning systems tend to calculate and analyze the economic evaluation index of the system with fixed construction and operation strategies. Under the changing market environment and air conditioning load, it is difficult to accurately reflect the application value of ice storage technology. Therefore, this paper investigates a new economic analysis method that takes into account the collaborative optimization of the operation and planning of ice storage and cooling air conditioning systems. The method proposed in this paper takes the maximization of economic efficiency as the optimization objective and constructs constraints on the system operation strategy and investment plan. Finally, we build a mixed integer linear programming model which can be efficiently solved by a commercial solver. The numerical analysis takes Chongqing region as an example and analyzes the economic value of investing in an ice storage cooling air conditioning system under the local electricity price policy and air conditioning load characteristics.

变电站中广泛应用的智能电子设备(IED)存在软件更新、硬件更换、应用更新及配置更改的问题。为了加强对于IED设备的管理以及故障情况的分析,文中提出了基于构件技术记录IED软硬件及配置参数等备份信息的版本管控系统设计方案。基于对智能变电站IED运行及改造过程中需要备份管控的关键信息的归纳和总结,设计了主子站信息交互的版本管控系统架构及管控流程。设计了用于描述IED管控备份信息的版本描述文件范例,并给出了实际应用范例。实验测试结果验证了版本管控技术方案的可行性。

With the increasingly stringent requirement of wide area measurement system for the dynamic performance of synchronous phasor measuring unit,the application of digital filter in the device tends to become complicated.In order to improve the accuracy,multiple filters often have to cooperate with each other to complete the calculation.This paper gives a detailed filter design of synchronous phasor measuring unit for intelligent substation.Finite impulse response (FIR) filter cascade discrete Fourier transform (DFT) will bring about a very large amount of computation pressure on the embedded device.This paper deduces the formula of filter coefficients after FIR cascade DFT.These coefficients calculated by offline formula can significantly reduce the calculation workload and solve the computation problem caused by the filter cascade.Theoretical analysis and practical test show that measuring accuracy is up to requirement of the relevant standards after adopting the above scheme.

This essay introduces the research results of automation information optimization which can improve both the power grid dispatching and the equipment monitoring as well as enhancing their efficiency,to meet the requirements of the regulation-control integrated operation under the "Large-scale Operation"system of Chongqing Electric Power Corporation.

The stability and reliability of the automatic system in transformer substation is the base for the safe operation of the power grid. This paper explores the power supply, grid and formation of the system in the substation, the actual state of timing, the problems and improving measures. Afterwards, feasible solutions are mentioned.