某额定容量300 MW机组在总阀位指令85％左右运行,一次调频动作期间,多次出现负荷波动现象,最大波动量39.6MW.通过对机组各调门流量特性计算,发现调门GV3特性异常.对比机组控制逻辑设置的流量特性函数与理想流量特性函数,在总阀位指令83.28％～85.29％区间,由于调门GV3流量特性异常导致调门流量线性度偏大,一次调频动作期间,机组超调引发负荷波动.通过优化阀序,消除调门流量特性异常影响.

为了准确研究光伏系统故障暂态特性,根据光伏发电系统具有随机性和间歇性的特点,研究了光伏系统送出线上发生不同故障类型的暂态过程.针对电网电压对称跌落和不对称跌落情况,提出了不同情况下的控制策略,得到了相应的控制目标.基于提出的控制策略和搭建的光伏模型,针对不同故障类型,模拟了光伏电站馈出的功率、电压和电流的暂态过程.仿真结果表明,光伏系统的故障暂态特性主要受控制策略影响,与传统发电机模型有较大区别,对光伏并网以及送出线保护具有重要的现实意义和理论意义.

大量分布式光伏接入配电网的电压稳定问题是影响电网安全稳定运行的关键环节.为了适应高渗透率分布式光伏发电系统的接入,提高主动配电网的动态电压支撑能力,提出了一种考虑光伏逆变器电流裕度的主动配电网动态电压支撑策略.该策略在分析配电网电压灵敏度的基础上,考虑光伏逆变器的电流设计裕度,能够在电压跌落故障情况下充分利用光伏逆变器的最大允许电流,实现光伏逆变器有功功率输出最大化,从而提高主动配电网的短期电压稳定性.最后分析了逆变器电流裕度对静止无功补偿系统的影响,并与常规无功补偿系统进行了仿真对比分析,验证了所提出策略的可行性和有效性.

Human factor is important to power system operation reliability and getting increasing attention. However, the lack of method and data in human reliability analysis (HRA) is becoming an important reason for preventing the development of HRA in power system. In allusion to the status of HRA in power systems, this paper proposes an expanded cognitive model and PIFs hierarchy related to power system operation. Then a database system of human factor in power system is established, which has functions of data collection, data management, human error probability (HEP) calculation, and data sharing. Results show that the database system can provide data support for verifying the applicablility of existed HRA method for power system operation and developing new HRA method.

使用相量测量单元（PMU）的实测数据,进行了大量的感应电动机负荷模型参数灵敏度分析,并从参数灵敏度的角度出发,提出了将灵敏度较小的感应电动机负荷模型参数固定,仅辨识灵敏度较大参数的方法。结合电网实际扰动仿真、暂态故障曲线Prony分析以及电网小扰动分析,使用综稳程序PSASP进行仿真分析,仿真结果证明了所提简化模型辨识的可行性和实用性。

This paper describes present evaluation assessment for primary frequency regulation(PFR),analyzes and compares performance evaluation criteria for unit PFR assessment,and proposes a rule of power assessment and economy compensation.On the basis of equipped PMU hardware in practice,a PFR intelligence monitor and evaluation system is developed and put into operation in Henan power grid,this system with higher intelligence not only can automatically distinguish frequency perturbation,but also count up good and poor action characteristic units for later analysis.Based on the improving performance of unit PFR in Henan power grid,it is concluded that the comprehensive performance assessment method is more scientific and more reasonable.

This paper introduces the application of power system stabilizer(PSS) in Henan power grid,and analyses the impact of the units PSS to the dynamic stability of Henan power grid in view of inside and outside Henan power grid,verifies the solution using small interference stability analysis,at the same time,discusses the next step that PSS requires to take in the progress.

The high-voltage line pilot using a transmission line to carry protection information,making use of transceiver broadly at present.This paper uses the coupling effects of the transmission lines,analyses an event specifically for a high frequency protects the transceiver mistake having carried out theoretically,makes an explanation that the cause of this event,and the advise to against the similar event in advance.

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.