State Grid Corporation of China is the largest state-owned electric utilities company in the world. It transmits and distributes power in China. The power distributor is headquartered in Xicheng District, Beijing and manages distribution from subsidiaries in Northern China, Northeastern China, Eastern China, Middle China and Northwestern China.After the electricity "Plant-Grid Separation" reform in early 2002, the assets of State Electric Power Corporation were divided into the five "power generation groups" that retained the power plants and five regional subsidiaries belonging to the State Grid Corporation of China in Beijing. The company is the seventh largest in the world according to the 2011 Fortune Global 500 ranking. Wikipedia.
State Grid Corporation of China, Shandong Electric Power Research Institute and Shandong Luneng Intelligence Technology Co. | Date: 2017-01-11
The present invention discloses a centralized monitoring system for transmission line inspection of unmanned aerial vehicles, including a centralized monitoring subsystem, mobile substations and unmanned aerial vehicle flight platforms. The centralized monitoring subsystem is connected with the mobile substations in a one-to-many mode, the mobile substations are connected with the unmanned aerial vehicle flight platforms in a one-to-one mode, in a manner of combining remote centralized monitoring with local monitoring, centralized monitoring is carried out on the flight states, pod states, transmission lines, inspection results and other information of more than one accessed unmanned aerial vehicle for line inspection, personnel, equipment and inspection lines involved in an unmanned aerial vehicle inspection task are planned and managed, and centralized management and defect diagnosis are carried out on the inspection results, so as to reinforce the informatization and automation degrees of the unmanned aerial vehicle inspection process and inspection result processing, improve the unmanned aerial vehicle inspection efficiency, and provide technical supports for achieving safe and reliable operation of unmanned aerial vehicle line inspection.
Chongqing Electric Power Research Institute, State Grid Corporation of China and The Smartech Institute | Date: 2016-11-23
The present invention discloses a live-working robot, comprising: a telescopic arm and a working hopper, wherein the working hopper and the telescopic arm are slidably connected along a vertical direction and the telescopic arm is provided with the drive component for driving the working hopper to reciprocate along a vertical direction. The live-working robot provided in the present invention achieves a movement of the working hopper along the vertical direction by slidably connecting the working hopper and the telescopic arm along the vertical direction and providing the telescopic arm with the drive component for driving the working hopper to reciprocate along the vertical direction. Since the working hopper is directly and slidably connected with the telescopic arm, there is no need to set a fly jib, which, as compared to the prior art, effectively improves the rigidity and stability of the working arm; which also effectively reduces the length of the working arm, thus reducing the size of the entire live-working robot and reducing the occupied space; and which can meanwhile increase strokes of the working hopper in the vertical direction and thus improve service performance.
State Grid Corporation of China, State Grid Smart Grid Research Institute and North China Grid Company | Date: 2017-02-15
A passive high-voltage direct-current circuit breaker and an implementation method therefor. The high-voltage direct-current circuit breaker is connected in a direct-current system in series, and comprises an energy absorption branch, a main branch and a current transfer branch which are connected in parallel, wherein the current transfer branch comprises first current transfer branches (T1, T2) and second current transfer branches(T3, T4); the energy absorption branch is composed of a nonlinear resistor (MOV); and the main branch comprises at least two groups of high-speed mechanical switches (Kl, K2) and at least two groups of full controlled device modules which are connected in series. Since the circuit has a simple topology structure, is simple and convenient to control, and is flexible to apply, the energy required by injecting a current into a capacitor can be obtained from a system without configuring an auxiliary power source, thereby improving the reliability of an apparatus. The used power electronic devices are mainly half controlled thyristors, so that the series connection technology is mature, the capability for current segmentation is strong, the level of withstand voltage is high, the expansion capability is strong, and the costs of devices are low.
State Grid Corporation of China and Hubei Electrical Power Transmission&Distribution Engineering Co. | Date: 2017-07-26
The present invention relates to a process for live replacement of a strain hard-tube bus-bar jumper insulator of a 800kV ultra-high-voltage DC transmission line. The process for live replacement of the strain hard-tube bus-bar jumper insulator of the 800kV ultra-high-voltage DC transmission line adopts a method of transferring a load on hard-tube bus-bars and drainage wires so as to transfer the stress on the jumper insulator onto load-bearing tools of hard-tube bus-bar lifting systems, such that the purposes of removing connection points at two ends of the jumper insulator and successfully replacing the jumper insulator are achieved.
State Grid Corporation of China, Zhejiang Electrical Power Test and Research Institute | Date: 2017-05-24
An MMC-HVDC system and an isolation device and isolation method for a direct current of the MMC-HVDC system are provided. The isolation device includes first isolation switches, current transfer switches, input and output terminals and a direct current breaker. One terminal of the direct current breaker is grounded and the other terminal of the direct current breaker is connected to all of the first isolation switches. Each of the first isolation switches is connected to one of the input and output terminal via one of the current transfer switches. Each of the current transfer switches includes a first arrester and one of a first IGBT group and an H-bridge group connected to the first arrester in parallel. The first IGBT group includes N first IGBTs and N second IGBTs. The H-bridge group includes N H-bridge circuits connected in series to each other, and each of the H-bridge circuit includes one first capacitor and four third IGBTs. NkU_(0)/U_(1), N Z. The isolation device can isolate the MMC and multiple direct current lines from the MMC-HVDC system, and save an investment cost of a power grid.
State Grid Corporation of China, China Electric Power Research Institute, State Grid Smart Grid Research Institute, State Grid Zhejiang Electrical Power Company and State Grid Shaoxing Power Supply Company | Date: 2017-06-28
Provided in the present invention is a power-line carrier communication method, comprising a preamble sequence-based low-speed robust communication method. The robust communication method provides an auxiliary communication mode when effective communication cannot be provided by a conventional communication mode in a harsh channel environment. Based on a preamble signal and a processing method therefor, the method allows timing and synchronization in a packet-switched data network. When normal communication cannot be carried out under the conventional communication mode, communication via the robust communication mode is attempted. The robust communication mode provided in the present invention is capable of providing low-speed and reliable communication when the conventional communication mode cannot work reliably, thus satisfying basic communication requirements of a network, and reducing network failure rate.
Xj Group Corporation, XJ Electrical CO., State Grid Corporation of China and Xuchang XJ Software Technology Co. | Date: 2016-09-22
A distributed test method applicable to a system-level test of intelligent high voltage equipment. The method includes: firstly, carrying out unified modeling on test equipment behaviors according to test requirements, and generating a general test case for ensuring accuracy and coordination of test behaviors and test time sequences under various work conditions; then, extracting, according to a feature element of role defining, sequence states of same roles from the general test case, and recombining the sequence states according to an execution sequence so as to form test sub-cases of the roles; finally, executing, by each piece of test equipment, corresponding test sub-cases to achieve cooperative linkage by means of information interaction, so as to accomplish entire process simulation of the test conditions.
Xj Group Corporation, XJ Electrical CO., Xuchang XJ Software Technelogy Co and State Grid Corporation of China | Date: 2016-09-09
Sampling implementation method and device based on conventional sampling GOOSE trip mode. CPU of master NPI plug-in, after receiving a second pulse, transmits sampling pulse generation time and a transmission enable bit to FPGA of the master NPI plug-in at a fixed interval; after detecting the transmission enable bit, the FPGA of the master NPI plug-in judges whether time of its internal timer is greater than/equal to the sampling pulse generation time, if yes, generates a sampling pulse to FPGA of collection plug-in; after receiving sampling pulse, the collection plug-in carries out A/D sampling, and transmits sampled data to the master NPI plug-in; when detecting that all A/D samplings are completed, the master NPI plug-in transmits data packets to protection CPU plug-in. The device includes an MMI plug-in, a protection CPU plug-in, a master NPI plug-in and a collection plug-in. Protection maloperation is thereby reduced.
State Grid Corporation of China, Henan Electric Power Company, Henan Epri Electrical Technology Co. and Xi'an Jiaotong University | Date: 2017-03-05
A device for calculating trapping parameters by measuring short-circuit current decay under a reverse bias voltage, including: a vacuum chamber, an experiment table, a lower electrode, a shielding layer, an upper electrode, a direct current charging module, a switch, a short-circuit measuring system, and a computer. The experiment table, the lower electrode, the shielding layer, the test sample, and the upper electrode are disposed from the bottom up in that order inside the vacuum chamber. The upper electrode is connected to the direct current charging module via the switch. The upper electrode and the lower electrode are electrically connected via the short-circuit measuring system. The short circuit or the detrapping current measuring circuit is selectively electrically connected under the control of the selective switch. The reverse bias voltage source and the microammeter are connected in series.
State Grid Corporation of China, State Grid Smart Grid Research Institute and China Epri Electrical Power Engineering Co. | Date: 2017-04-19
A modular multi-level flexible direct-current topology circuit suitable for fault ride-through, comprising a module cascading circuit, a voltage conversion circuit and a compensation circuit, wherein after being connected to the voltage conversion circuit in parallel, the module cascading circuit is connected to the compensation circuit in series. The direct-current topology circuit can achieve alternating-current and direct-current fault ride-through simply and effectively, thereby being suitable for application in the field of high-voltage high-capacity direct-current overhead lines.