就1 000 kV GIS设备运输、吊装、扩建及布置尺寸优化等问题进行了探讨.结合河南平高电气股份有限公司(平高)、西安西电高压开关有限责任公司(西高)和新东北电气集团有限公司(新东北)1 000 kV GIS设备调研结果,给出了适应干不同厂家设备外形的一个完整串横向和纵向布置尺寸要求值和1 000 kV GIS各安装单元的一般吊装要求.此外,论述了方便远期扩建的GIS建设方案和1 000 kV GIS配电装置布置尺寸确定方法,并以1 000kV济南变电站为例,给出了1 000 kV GIS布置方案优化指标.

In view of the still existing extra-high voltage(EHV)and ultra-high voltage(UHV)electromagnetic loop networks, the different forms and structures of development of electromagnetic loop networks are summed up with the cases and examples in a provincial power grid.It is believed that the main risk of electromagnetic loop networks lies in the transfer and control of power flow.The degree of coupling is proposed as an index to measure the intensity and risk of electromagnetic loop networks. In terms of network structure optimization and strengthening,it is considered that the higher voltage power system should be strengthened prior to the strongly coupled weak electromagnetic loop, and the short circuit level control and structure simplifying are more important for the weakly coupled strong electromagnetic loop while multilevel electromagnetic loops should be decoupled as soon as possible.Then the typical split schemes of electromagnetic loop networks are analyzed.Since EHV and UHV electromagnetic loop networks will exist for a long period of time,practical power flow transfer control algorithms for single element trip and cascading trip of electromagnetic loop networks are elaborated.Especially,a kind of unconventional stability control measure of the fast tie-element removal strategy after serious fault is put forward to decouple electromagnetic loops and balance power flow for high-power and strong-coupling electromagnetic loop networks.The stability level and transmission ability of the electromagnetic loops are effectively enhanced.The research results have been applied in actual power grids with good effect.

结合已建1000kV变电站工程噪音分析研究的相关成果和泉城站的特点,用噪声预测软件SoundPLAN对1000kV泉城站进行噪声预测,提出适合本工程的降噪方案,有效减小泉城站噪声对站内运行人员和周围环境的影响.

针对1 000 kV特高压变电站绝缘子串采用瓷绝缘子片具有片数多、结构长、重量大及运维工作量大的缺点,对合成绝缘子在1 000kV特高压变电站悬垂绝缘子串中的应用进行了研究.基于已有运行经验,给出了1 000kV合成悬垂绝缘子串的组串方案.经分析,采用合成悬垂绝缘子串可节省变电站构架投资,具有一定的技术经济性.

The feasibility of DC modulation technology application in the Northwest China grid was studied in this paper.The simulation results indicated that the frequency stability and transient stability of the power systemafter severe failure can be improved,and the overload of AC power system can be eliminated,so the power transmitting capacity of AC power systemcan be increased.

As one of the most important equipment in UHV stations, the shunt reactor is vital to the safety and stability of the power system. According to studies on the function of the shunt reactor,operation requirements for the 1000kV shunt reactor in terms of reactive power compensation and over-voltage restriction, and with consideration to the existing 500kV shunt reactor with regard to its design, operation, testing and occupied areas, as well as the investment effect for canceling the disconnector of the shunt reactor,the connection of the lOOOkV shunt reactor circuit is optimized. The result shows it is feasible to cancel disconnector for 1000 kV substations, and it can save occupied areas and investment.

As a large-capacity low-speed flywheel energy storage system,the multi-functional FPC(Flexible Power Conditioner) consists of a DFIM(Doubly Fed Induction Machine) and an AC exciter,i.e.voltage-source PWM(Pulse Width Modulation) rectifier-inverter.With the ability of independent active and reactive power control,it is used to improve the stability of power system as well as the quality of power supply.An improved stator flux linkage orientated control strategy is proposed for FPC,which uses voltage control instead of reactive power control,feedbacks the stator q-axis voltage and compensates the stator d-axis voltage to obtain better robustness against the grid voltage fluctuation.During grid disturbance,terminal voltage dip may induce over-current in rotor windings,which leads to equipment trip for converter protection.Special fast rotor over-current restriction technique is adopted.In addition,the rotation feedback control is added to keep the practical rotation speed at setting value when FPC stands by.