针对大规模电动汽车接入电网对其电压质量的影响,提出一种考虑节点电压的电动汽车半协调充电优化方法.该方法综合考虑了电动汽车在时空中的移动情况,能够解决大规模电动汽车接入电网充电时的电压拥塞问题,满足电网接纳能力.

In the case of partial discharge training for recruits who lack of on-site work experience, the risk of physical shock and damage of the test equipment may be due to the limited skill level and improper operation by new recruits. Partial discharge simulation tester is the use of simulation technology to achieve partial discharge test process simulation, relatively true reproduction of the local discharge process and results, so that the operator in the classroom will be able to get familiar with and understand the use of the test process and equipment.The teacher sets up the instrument to display different partial discharge waveforms so that the trainees can analyze the test results of different partial discharge types.

Combining with the arrester simulation device put into use successfully, this paper introduces the application of arrester test in the insulation resistance measurement, counter test, Leakage current test under DC 1mA voltage and leakage current test under 0.75U1mA. By comparing with the existing training, this paper summarizes the arrester simulation device's outstanding advantages including real time monitoring, multi-type fault data analysis and acousto-optic simulation. It effectively solves the contradiction between authenticity and safety in the existing test training, and provides a reference for further training.

断路器是重要变电设备,也是变电检修实训基地内的重要实训设备,其日常维护、检修、故障处理是变电检修作业人员的必备技能,是变电人员的重点实训项目.变电检修培训室开展了大量断路器检修的实训课程,在位轮训和新入企员工岗前培训中,断路器相关内容的技术技能培训都是重头戏.

Large-scale power flow transferring caused by overload lines removal is an important reason for cascading overload trips. For obtaining transmission section consisting of the lines that affected largely by the power flow transferring, this paper proposes a fast search algorithm about transmission section based on path split between sources and flows. Firstly, the algorithm transforms the actual grid structure into a directed graph using graph theory, then establishes the sending end node-power transmission branch adjacent table and quickly generates path trees of sources and flows. Breaking distributed factors of the branches included in all the effective path chains between sources and flows are calculated. The lines that largely affected by the power flow transferring are identified. This algorithm needn’t search for entire network topology and doesn’t contain any large mass matrix operations, so it is efficient. Finally, the simulation results of IEEE 39 nodes prove the rapidity and correctness of the algorithm.

The invention relates to a tool special for rigid busbar twisting processing. The tool special for rigid busbar twisting processing is composed of a fixing part and a twisting processing part. The tool special for rigid busbar twisting processing is characterized in that the fixing part is composed of two steel plates, two long holes are formed in each steel plate, the two steel plates are connected through four bolts, a 5 mm-thick steel plate is welded to one steel plate by 90 degrees, an iron plate for fixing is installed on the fixing part, and the iron plate is fixedly installed on a bench clamp; the twisting processing part is composed of two twisting processing steel plates and operating handles on the two sides of the twisting processing steel plates, and the operating handles are installed on the two twisting processing steel plates. The tool special for rigid busbar twisting processing is the special tool which can conduct twisting processing on various types of rigid busbars frequently used in an existing power system, the tool can be operated by one person or two persons, and the tool has the advantages of being convenient to use and easy to operate; the fixing part and the twisting processing part can be adjusted according to the size of the busbar, and the busbar can be clamped. The twisted busbar is in accordance with the requirements of the technological standard, and the attractiveness is good.