By dividing the global area into several control areas,a multi-area based automatic generation control(AGC) multi-objective coordinated control method is presented.The main control area objective is to control the area control error ACE of the global area,while the sub-areas are responsible for maintaining the power flow of tie-lines among areas at scheduled interchange and cooperating with the main area in emergency.The method proposed can realize multi-objective coordinated control conveniently and is beneficial for the safe and high quality operation of the power grid.Actual application in the power grid of Henan Province demonstrates the practicability and validity of the method.

The dispatching station is the last guard for power grid against emergency.It is very important that power grid dispatcher could realize the arising,development,hidden trouble and law to avoid the power grid disaster.The provincial dispatching center generally takes charge in 220kV provincial power grid with complex framework and numerous weaknesses.With analysis and thinking to accident survey standard,the hidden trouble and risk of power grid dispatching could be found for preventing and avoiding accident effectively.According to material characteristics of provincial dispatching station and real examples,this paper analyze the accident risks of provincial dispatching operation.Based on these analysis and material dispatching work,the preventive strategies are proposed.These preventive strategies are wished to beneficial for other provincial dispatching stations.

A new algorithm and strategy for power flow control based on the sensitivity analysis for voltage-grading and district-dividing power system under the condition of energy-conservation power generation dispatch is proposed. It is analyzed that how to coordinate the coal consumption rate and sensitivity analysis of power flow control to calculate the optimal dispatch sequence of coal-fired units when near the transfer limit of 500kV transformer interface in the electromagnetic loop network. The algorithm and strategy has been implemented in the north Henan power system. The results show that the algorithm and strategy can optimize the energy sources and resource allocation function of power system under the premise of the power system security,and thus achieve the harmonization and unification between security and economy.

The systematic, synthetic and sequential preventing measures are one of the important methods of avoiding large-scale blackout. Most of the currently applied forewarning and preventive control systems focus on the dynamic, on-line and real-time security and stability analysis and precautions, but it is considered in this paper that proceeding from the whole process of power grid operation and production will better realize comprehensive prevention. The system engineering concept is applied to four important steps in power grid operation and production for direct security and stability analysis and preventive control. The crux of this method is security and stability analysis and the preventive control measures for four time step-up grades, i.e. weekly planning, daily planning, pre-operation and real time planning. The implementation and key techniques of a four-grade forewarning and preventive control system for secure and reliable operation of Henan power grid is described.

With the assessment method for current of interconnected lines has been changed from area control error (ACE) mode to control performance standard (CPS) mode in Central China Power Grid, the coordinate control between hydro units and thermal units for automatic generation control in Henan Power Grid becomes very important because of having a few hydro units. For this new condition, two control modes are proposed in this paper. Based on the experimental investigation on the coordinate control between hydro units and thermal units, the characteristics and effects of two control modes and different control schemes based on them are analyzed. Then the proper coordinate control scheme of hydro units and thermal units is presented. The further work are put forward to solve the problems found in the coordinate control experiment.

介绍了1起因110kV开关旁刀闸线夹断裂引起的电网及电厂停电事故,由于使用的线夹不符合设计要求埋下了事故隐患;线夹断裂引起弧光短路时,由于保护装置的直流电源存在的问题导致了电网事故的扩大;电厂孤网运行后,由于高压油动机性能不佳、调门未能迅速开启,引起机组跳闸。总结了事故教训并提出了有关改进建议。

This article introduce the method in detecting hydrogen leakage of generator by using Helium mass spectrum detector.It compare other familiar methods of detecting hydrogen-leakage in power plant,explain the causation ofleakage,summarize experiences and lessones.This article also discuss the diagnose and disposal of hydrogen leakage on 300MW unit by using UL200 leakage-detected in- strument.

Under the Control Performance Standard (CPS) and current level of AGC in Henan Power Grid,The paper corrects and extends the thermal-hydro coordination control strategy based on A1/A2 standard to satisfying the CPS detailed rules that is being used in Huazhong Power Grid.

介绍了一起因220kV线路故障、线路开关拒动引起母线失灵保护动作,造成两台135MW机组带小网负荷与系统解列发生振荡的事故经过及处理过程,分析了机组及小网振荡的原因,并对事故处理方法及防范措施进行分析和总结,提出了有关改进建议。

The paper proposes the model of optimal preventive control based on voltage security in electricity market. The objective function is the minimization of total payments of preventive control and must ensure each bus have enough voltage security margin. The sensitivity of voltage security based on voltage stability index and the concept of equivalent reactive power compensation of generator is also introduced in the paper, and calculates the price of each reactive power compensation method based on their contribution in voltage security and the decrease of reactive power from generators is calculated. Computer tests on WSCC 9 bus system show the feasibility and reasonableness of the model.

Under the control performance standard(CPS) and current level of AGC in Henan Power Grid,this paper corrects and extends the AGC control strategy based on A1/A2 standard to satisfy the CPS detailed rules that is being used in Huazhong Power Grid.The strategy includes dynamic AGC control strategy based on pre-day plan,thermal-hydro proportion in taking on ACE and alignment strategy of thermal power AGC.The three strategies improve the AGC adjusting performance and frequency quality in Henan Power Grid.