42results about How to "Reduce blackout area" patented technology

The invention relates to a distributed micro-grid black-start control system and method based on photovoltaic and energy storage. At present, a distributed micro-grid black-start control system and method based on photovoltaic and energy storage, which are reasonable in structural design, do not exist. The black-start control system is characterized in that a photovoltaic array interface, a photovoltaic DC converter, a photovoltaic grid connected controller and an AC bus are connected in sequence through a cable, the photovoltaic DC converter, an energy storage charging controller and a storage battery are connected in sequence through a cable, and an energy storage current transformer controller and a storage battery DC controller are connected through a communication cable. The black-start control method is characterized in that A, an AC bus system provides power; B, a DC bus system provides power; and C, black-start of a distributed power supply is performed. The control system is reasonable in structural design, black-start of a distributed power supply can be achieved, the power failure area, the power failure time and the recovery time once a power grid breaks down can be reduced, and the safety stability of regional power grids and a large power grid can be improved.

The invention relates to an automatic control device for a vacuum circuit breaker on an electric distribution network. The control circuit of the device mainly comprises a signal acquisition and working power supply unit, a logic judgment unit, a man-machine interface and an execution mechanism which are connected. The control device can be matched with the vacuum circuit breaker on the electric distribution network; when the electric distribution network fails, logic judgment can be performed according to acquired information and a failure area is quickly identified and isolated; meanwhile, the normal power supply of a non-failure area is recovered, power failure areas caused by the failure are greatly reduced and power failure time is shortened; and work amount is greatly reduced and the safety factor of field operation is improved. The control device has a simple structure, a reasonable design, safe and reliable performance and low cost, and is flexible and convenient to operate and convenient to install and maintain.

One or more embodiments of this specification provide a GCS drawer type switchgear, including a cabinet body, several unit drawers are installed in the cabinet, connecting wires are installed at the rear end of the unit drawers, and a For the busbar, guide assemblies are installed on both sides of the unit drawer, one end of the guide assembly is installed with a clamping structure, and a clamping groove is provided in the cabinet, when the clamping structure is connected to the clamping When the grooves are matched, the connecting wires are connected with the busbars. The present invention provides a plurality of unit drawers, and the unit drawers are closed to each other, which is convenient to use. Each unit drawer is respectively connected to the busbars through the connecting wires, and the cabinet The space on the reverse side is large, which is convenient for wiring and connection of current transformers and electric meters. It is convenient for power outage maintenance, reduces the power outage area, and improves the reliability and safety of power consumption.

The invention provides a power distribution network dynamic power restoration method based on a load curve, which belongs to the technical field of power distribution system automation. The method utilizes a computer, realizes computing through programs and comprises the steps of inputting basic parameters; computing active load and reactive load of each node in each hour and determining a grid structure in normal operation; determining a fault section, a power supply path of the power side of the fault section and a grid structure after failure isolation; applying a traditional genetic algorithm to determine a candidate grid structure set of the least loss load in each hour during fault restoration; finally determining the optimum dynamic power restoration scheme during fault restoration. The method fully utilizes the load curve, and the dynamic restoration scheme is formulated by hour, so that the grid structure changes along with the change of the load during fault restoration, and accordingly, the method has the characteristics of being capable of effectively reducing power failure areas caused by fault, shortening power failure time for users, reducing the power failure loss of the users, and the like. The method can be widely applied to power distribution network power restoration.

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

The invention provides a self-adapting voltage quick-break protection method of a distribution circuit. The method is realized in a time domain, a troublesome power frequency quantity extraction algorithm is effectively avoided, the data window needing calculaing is short, the calculated amount is small, the protective movement speed is greatly increased, and the quick operated requirement is met; and a protection principle has very strong adaptivity, and the self-adapting voltage quick-break protection method of the distribution circuit provided by the invention has the advantages of being not influenced by a failure mode and a system operation mode. The self-adapting voltage quick-break protection method of the distribution circuit provided by the invention is mainly used for relay protection of the distribution circuit of an electric system.

The invention provides an indoor intelligent 10 kV boundary circuit-breaker switch cabinet having a communication function. The indoor intelligent 10 kV boundary circuit-breaker switch cabinet comprises a cabinet body; an intelligent monitoring unit is arranged at the upper end of the front side of the cabinet body; and a line inlet side bus connection unit and a line outlet side boundary circuit-breaker unit are arranged at the lower end of the front side of the cabinet body. The indoor intelligent 10 kV boundary circuit-breaker switch cabinet disclosed by the invention has a boundary short-circuiting function of rapidly breaking T-type connection of a 10 KV major network while a user line inlet side has a fault, so that the power failure area is reduced; the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a function of uploading data information of a main station through communication; therefore, the position of a fault point is convenient to rapidly position; the power failure time is shortened; power supply is rapidly recovered; furthermore, the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a complete and powerful acquisition function of a user network; current measurement is realized through a protective CT (Captive Test); various data can be displayed accurately; historical operation parameters can be memorized and inquired; simultaneously, an on-pole (outdoor) boundary circuit-breaker can be completely replaced; by means of floor type installation, the indoor intelligent 10 kV boundary circuit-breaker switch cabinet is convenient to overhaul; the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a ventilation heating system outside a gas tank; three master devices including an integrated circuit-breaker, an isolation switch and an earthing switch are integrated in the gas tank; and the indoor intelligent 10 kV boundary circuit-breaker switch cabinet is small in volume, material-saving and low in manufacturing difficulty and cost.