318results about How to "Reduce the number of movements" patented technology

The utility model discloses a control method for optimal operation of reactive power and voltage in distribution network below 10kV, which is characterized in that a distribution network reactive compensating comprehensive control device is arranged on the distribution network to collect the parameters such as voltage, current, active power and reactive power of all nodes in the distribution network and send the parameters to a main control server; at the same time, the main control server receives the parameters such as voltage, current, active power and reactive power of the transformers in the transformer substation transmitted by the reactive optimal server of regional power networks through an SCADA interface server, and conducts reactive voltage optimal calculation, switching the changer through up regulating the main transformer on-load tap changer of the transformer substation or down regulating the distribution network reactive compensating comprehensive control device. The utility model changes the voltage optimal control goal from ensuring a qualified 10kV bus voltage in the transformer station to ensuring a qualified voltage of final user terminals in the distribution network, realizes the optical control of combining distribution network reactive voltage and transmission network, and realizes reactive hierarchical spot balance in the real sense.

The invention provides a capacity configuration method of a hybrid energy storage system for stabilizing wind power fluctuation. The hybrid energy storage system comprises a power type energy storage system and an energy type energy storage system. The method includes the steps that (1) the grid connection active power of wind power and the active power P (t) of the hybrid energy storage system are acquired, and a wavelet packet decomposition method is utilized to acquire power type energy storage power and energy type energy storage power respectively; (2) the hybrid energy storage system at different rated power P and under different capacities is configured, and the stabilizing effect of the hybrid energy storage system is analyzed; (3) according to the stabilizing effect and an improved particle swarm algorithm, the capacity of the hybrid energy storage system is configured. Compared with the prior art, according to the capacity configuration method of the hybrid energy storage system for stabilizing wind power fluctuation, a control policy is built according to the current electric quantity conditions, power magnitude required to be exerted and the rated power of the power type energy storage system and the energy type energy storage system and the improved particle swarm algorithm, and wind power fluctuation is stabilized and effectively controlled.

The present invention relates to a buffer capable of regulating working period and its operation method. Said method is used for applying it to series-connected inverters. Every inverter possesses several charging current pathways and several discharging current pathways, when the working period of clock signal is reduced, the number of discharging current pathways is reduced and the number of charging current pathways is reduced. Said invention uses the buffer on the clock pathway circuit for providing adjustable working period to dynamically regulate the time of rising edge and falling edgeof clock signal so as to dynamically change working period of clock signal.

The invention provides a control method for improving reliability of an AVC (Automatic Voltage Control) system of an electric power monitoring center. The control method comprises the steps of performing real-time telemetry data processing; performing real-time remote signaling data processing and dead data processing; and determining the data as dead data, locking a corresponding reactive voltage regulating device and sending alarm signals when the AVC system detects that telemetry information is not refreshed for a long time. The control method for improving the reliability of the AVC system of the electric power monitoring center has the advantages of achieving optimal control and closed loop operation of reactive voltage of the integral grid due to the fact that centralized monitoring, unified management and online control are performed on an on-load voltage regulating device and a reactive compensation device of every power substation in a power grid and ensuring that the AVC system enables a voltage reactive control strategy to be optimized, reducing the times of once action of the reactive voltage regulating device, improving the service life of the device and providing the corresponding technical support for improvement of the reactive voltage management level and safe, stable and high quality operation of the integral power grid due to the fact that the AVC system still relies on real-time data collected through an SCADA (Supervisory Control And Data Acquisition) system to calculate to a great extent.

The invention provides an intelligent reactive power optimization and coordinated control system of a middle-and-low-voltage regional power grid. The intelligent reactive power optimization and coordinated control system comprises a main station and one or more sub-nodes, wherein the main station is used for coordinating reactive power balance of the whole regional power grid; each sub-node is connected with the main station through a network, is used for conducting on-site reactive power balance and comprises a substation reactive power compensation intelligent control device, one or more circuit reactive power compensation intelligent control devices and one or more distribution-transformer reactive power compensation intelligent control devices. The coordinated control system from top to bottom is built in the energy transfer direction, and therefore the defect of automatic and on-site reactive power compensation of sub-node control terminals can be overcome effectively. Meanwhile, according to the comprehensive coordinated control system, by means of voltages, power factors and constraint conditions of harmonic interference, each feeder line is analyzed, control instructions are produced, then, feeder lines belonging to a 10kV outgoing line of a substation are analyzed comprehensively by making the 10kV outgoing line of the substation be the center, and after control strategies are verified comprehensively, it is guaranteed that the maximal optimization result of the system is obtained with minimal cost.

The invention provides a wind farm active power optimal control method based on power prediction information. The method is based on prediction of ultra-short-term wind power, various limitations on operation of a wind farm are taken into consideration, output of various turbines is smoothened, the action frequency of a turbine control system is reduced, an optimal algorithm is adopted, and accordingly variation of output power of each turbine is optimized. Compared with a current common variable-proportion allocation algorithm, the method has the advantages that the frequency of violent fluctuation of the output of the wind turbines can be reduced and can be reduced completely at most, accordingly, total adjustment frequency of the wind farm is reduced, and the method is favorable for reducing maintenance cost of the wind farm and is also beneficial to reducing influences of power adjustment to the service lives of the wind turbines.

The invention discloses an active distribution network (ADN) voltage real-time fuzzy control method. The method comprises steps: according to the maximum and minimum values of feeder voltage uploaded by each feeder, the maximum voltage and the minimum voltage of the distribution system are put forward, if certain feeder voltage exceeds a threshold, a reactive power fuzzy controller FQC for DG (distributed generation) is started, and reactive power is injected or absorbed through the DG; and if the reactive power fuzzy controller FQC for the DG can not restore the voltage to a normal level and deltaVsys< / =deltaVmax-deltaalpha, a transformer on-load tap changer fuzzy controller FOC is started, the transformer on-load tap changer OLTC completes a voltage regulating task, or otherwise, an FPC is started, and the deltaVsys is reduced, wherein the deltaalpha is an adjusting value of the tap changer. The main control unit of the invention has a simple control algorithm, the needed communication data are few, the calculation amount is small, the decision-making time is short, problems of over voltage and low voltage caused due to mutual action between the OLTC and the DG can be lessened, and the consumptive ability towards the DG by the ADN can be improved.

The invention discloses a method for mining a steeply inclined coal seam. The method comprises the following: step one, opening a return airway (2) and a first conveyor roadway (3) in the steeply inclined coal seam (1); step two, digging a first through cut (12), and placing a flexible shield support (5) on the first through cut (12) for roof control, thereby forming a false dip primary mining working surface (8); step three, starting coal mining on the primary mining working surface (8); step four, gradually extending the primary mining working surface (8) downwards to produce a second through cut (11) for the coal seam of the next section opposite to the inclined direction of the primary mining working surface (8), when the primary mining working surface (8) is propelled to the position of the second through cut (11) which is designed for the coal seam of the next section, and mining the coal seam of the next section; step five, mining the lower coal seam with the step four, and continuously and recurrently mining the whole steeply inclined coal seam (1) from the bottom to the top. The method has the advantages of high mining efficiency, safer mining and high percentage of recovery.

The invention discloses a multi-area interconnected power network ultra-high voltage tie line power control method. The method comprises the steps that the ACE and the ultra-high voltage tie line power deviation delta PUHV in an area are collected in real time; if the ACE is larger than a safety stability threshold value, the frequency modulation set output variable quantity configured in the area is adjusted and controlled; and the MT index value of the area is computed according to the ACE and the delta PUHV, whether the MT index value of the area surpasses an MT index threshold value is judged, and if the MT index value in the area surpasses the MT index threshold value, the frequency modulation set output variable quantity configured in the area is adjusted and controlled. A hierarchical control concept is used, the frequency safety of the area is guaranteed through the ACE index first, then by using the MT control performance evaluation index divided in areas, coordination control on each area through a frequency modulation set configured in each area is achieved, power fluctuation on a main tie line is effectively suppressed, adjusting efficiency is high, and action frequency is low.

The invention discloses a condensing pressure control device of an air conditioning unit and a control method thereof. The device comprises a ball valve arranged on a coolant pipeline of a heat exchanger, an adjustment mechanism used for adjusting the opening of the ball valve and a control mechanism used for controlling the actions of the adjustment mechanism, wherein the control mechanism comprises a source information acquisition module, an information storage module, a comparison module and a master control module. The condensing pressure control method for the air conditioning unit comprises that: acquired source information on the coolant pipeline of the heat exchanger is transmitted to the comparison module; the comparison module compares the received source information with pre-stored set information and transmits obtained comparison information to the master control module; and according to the comparison information, the master control module controls the adjustment mechanism to adjust the opening of the ball valve on the coolant pipeline of the heat exchanger. The condensing pressure control device of the air conditioning unit and the control method thereof provided by the invention are reliable in control, high in accuracy and system flexibility and capable of performing real-time monitoring, protecting the valve and being adapted to different compressors and different refrigerants.

The invention discloses a long wall alternate type coal mining method which comprises the following steps: the reasonable mining band width of the long wall alternate type coal mining method and the coal pillar size retained among mining bands are determined, and the working face adopts a single hydraulic prop and a metal articulated top beam; the working face adopts alternate mining, i.e. a coalpillar is retained when a mining band is mined, and the coal pillar is retained or 2 to 3 mining bands form a mining section; a temporary coal pillar is retained among the mining bands; a rigid isolation coal pillar is retained among the mining sections; and the long wall alternate type coal mining method is a mining method for arranging the working face on the long wall and propelling in an alternate way to prevent through thickness integral cutting and falling of covering rock. The method has the effect of improving the mining rate of an original house pillar type mining method to 60-70 percent from 20-30 percent; the working face propelling distance of the method is more than twice of a tool post type method, and the moving frequency of the working face is reduced to less than half; themining rate of a mining area is improved, and a top plate large-area collapsing catastrophe is prevented by top plate small-area disaster-free falling by the liming and isolating effect of the coal pillar on the covering rock.

The invention discloses an intelligent substation secondary equipment site-wide simulation test system. The system comprises a test work station provided with intelligent power network simulation software, an I / O interface module, a wireless control host and one or more wireless terminals. Each wireless terminal comprises a wireless terminal body and an intelligent terminal simulation device. The test work station is in two-way connection with the wireless control host in real time, and the wireless control host is in two-way connection with the wireless terminals through a wireless network. A plurality of related protection, measurement and control devices at intervals have access to the simulation test system, and the related protection, measurement and control devices and intelligent substation secondary equipment form the closed-loop simulation test system together to achieve overall test of the secondary equipment. According to the simulation test system, the wireless terminals are distributed beside on-site devices at different intervals and are connected on site, the wireless terminals are connected with the test work station in a wireless mode, debugging personnel do not need to carry optical fibers, and the system is convenient to build and high in environment adaptability.

The invention discloses a mining area self-reserved roadway non-pillar mining method suitable for a gently inclined coal seam. The method comprises the following steps of determining the exploitationrange for gob-side entry retaining without coal pillars in a coal mine, forming openings at main roadways, tunneling two mining area roadways and an air return roadway of a first-mining working face,and widening a crosscut to connect with a main air return roadway; connecting the three roadways and the crosscut, so as to form a preparation roadway and an air ventilation system of the mining area, which is the main feature of the method. The method is characterized in that the open-off cut is performed on a first working face, and various production systems are arranged; the stoping is performed on the first working face, and a gob-side entry retaining technique is used for remaining the roadway with a certain width as a transportation roadway of a second working face; the stoping is performed on the second working face, and the roadway with a certain width is remained as an air return roadway of a third working face; the steps are repeated for the subsequent working faces. The methodis used for realizing the stoping without roadway tunneling and coal pillars in the mining area.

The invention relates to a regulation power dynamic optimization and distribution method with a dead-zone. A dead zone value is related to the scale and allowed frequency of a regional power grid; regulation entering a dead zone scope is considered as in a quasi-stable state; the output of regulation power is unchanged; the regulation power is given to a regulated automatic generation control (AGC) unit according to an economic distribution principle; therefore, the yield of a control performance standard is ensured under the condition that the operation frequency of the unit is reduced; the regulation power is distributed according to the speed of the unit in a regulation region; and the rapidity of frequency regulation is ensured.

The invention discloses a mimic-disconnecting switch testing device for relay protection and a control method thereof. The mimic-disconnecting switch testing device comprises an acquisition module, a processor, an execution module, a display module, a setting module, an alarm module, a direct-current power supply current sampling circuit and a power supply module. The processor receives and processes relay protection device commands inputted by the acquisition module and directs the execution module to simulate the opening and closing operations of a circuit breaker and displays the related state change under the control of an embedded program. The setting module adjusts the command identification voltage reference voltage in the acquisition module according to the set opening and closing setting current and stores the set opening and closing time in the processor. The display module displays the state of the circuit breaker under the control of the processor. The mimic-disconnecting switch testing device can achieve the single-phase opening and closing test and the three-phase opening and closing test of the relay protection equipment and the anti-tripping test of the operation box of the circuit breaker. The mimic-disconnecting switch testing device can simulate the related operating condition of the field circuit breaker relative to the relay protection equipment more reliably, and performs the equipment protection debugging.

The invention discloses an inorganic composite cementing material specialized for coal mine filling, and a preparation method thereof. The inorganic composite cementing material is composed of the following raw materials: compound Portland cement or cement clinker, ordinary Portland cement, blast furnace slag micropowder, industrial waste gypsum, carbide slag, fly ash, an additive, citric acid and an excitant. The preparation method comprises the steps of drying all raw materials by a dryer; conveying the dried raw materials into a ball mill for milling; storing the dried raw materials in a raw material bin; conveying various raw materials to a mixer by a conveying melt; mixing uniformly; and then storing the mixture in a finished product warehouse. A filling paste provided by the invention can not be solidified or can be slightly solidified in 4 h and a slump degree is higher than 230 mm, can provide enough time for maintenance of filling equipment, prevents phenomena of tube plugging and waste tube caused by a long distance conveying pipe, can guarantee that mining work can be continuously carried out without mining column after demolding in 8 hours, increases mining output, increases resource mining rate, saves labor cost and increases production efficiency.

The invention discloses a method for over-speed protection of a turbine under the load shedding working condition, which comprises the following steps that: (1) when the load of a unit is more than or equal to 30 percent of rated load and a generator oil switch is switched off, over-speed protection control (OPC) acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets; and (2) when the rotating speed of the turbine is more than or equal to 103 percent of the rated rotating speed, the OPC acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets. By the technical scheme, for a turbo generator unit with a fully opened intermediate regulating valve under the load shedding working condition, the OPC action frequency can be effectively reduced and secondary acceleration over-speed can be avoided under the load shedding working condition; and for a unit of which the intermediate regulating valve participates in regulating under the load shedding working condition, the rotating speed of the unit is stabilized as soon as possible. Therefore, the technical scheme has important significance for ensuring the safe and stable running of the turbo generator unit and safe power supply of a power grid.

The invention provides an improved adaptive droop control method for a hybrid energy storage system in a DC micro-grid and relates to the stable running field of the DC micro-grid. The method is characterized in that, based on the improved hybrid energy storage system in the DC micro-grid, a lithium battery is connected with a DC bus through a DC / DC converter I. A super capacitor is connected with the DC bus through a DC / DC converter II. In this way, a hybrid energy storage system of a parallel connection structure is formed. According to the technical scheme of the invention, the effective energy compensation problem of the lithium battery for the super capacitor of the hybrid energy storage system in the DC micro-grid can be is effectively solved. Meanwhile, an improved adaptive droop control method is provided for the hybrid energy storage system in the DC micro-grid.

The invention discloses a detection method comprising the steps as follows: a charging zone, a testing zone and a discharging zone are arranged along a first direction; a bearing mobile device and a pick-up device are mutually opposite and configured along a second direction, and oppositely move in the three zone along the first direction; the components to be tested of the charging zone is sucked by the bearing mobile device through the staggered trend design of the bearing mobile device and the pick-up device; the components to be tested are moved to testing seats of a testing zone; and after each testing seat is driven to pass through units such as a flat testing unit, an electrical testing unit, an efficiency testing unit, etc. by a driving device, the tested component is moved to the discharging bearing disk of the discharging zone by the pick-up device to be positioned. Therefore, the massive detection of the batch is performed, the charging and the discharging is respectively arranged at both ends of the testing zone, so that the machine configuration is integrated, the carrying efficiency and the testing efficiency are improved, the moving frequency of objects to be tested is further reduced, and the yield rate is prevented from reduction due to pointless deterioration.

The invention relates to a voltage control method for distribution network considering source-load coordination. The method calculating voltages of each node in distribution network, and directly outputting and ending the voltage regulation if the voltages of each node are within a prescribed range, Otherwise, determining whether the voltage exceeds the upper limit or not, and if the voltage valueexceeds the prescribed upper limit value at this time, carrying out the voltage control by using the source-charge coordinated voltage control model of a photovoltaic, an electric vehicle and an on-load tap changer; Otherwise, inducing the capacitor in the control measures to exceed the lower limit value, and the voltage control model including photovoltaic, electric vehicle, on-load tap changerand capacitor will be used to control the voltage. The optimal solution of the voltage regulation model of source-charge coordination is used to regulate the voltage. Combined with the interaction among load side, power side and grid side, considering the uncertainty condition and demand side response characteristics, it solves the problem of distribution network voltage exceeding limit under different meteorological factors considering photovoltaic grid-connected.

The invention discloses a driving-and-braking-optimal-switching electric-automobile adaptive cruise control method. The driving-and-braking-optimal-switching electric-automobile adaptive cruise control method includes the following steps that ideal driving-and-braking torque and the driving-and-braking switching rule are calculated through an upper controller; the ideal driving-and-braking torque is distributed on four wheels through a lower controller. According to the driving-and-braking-optimal-switching electric-automobile adaptive cruise control method, the driving-and-braking-optimal-switching adaptive cruise control strategy is designed and converted into a real-time mixed-integer nonlinear programming proposition through the upper controller according to the current road environment and the driving requirements, the proposition is solved through the double-nesting solving algorithm based on the modified genetic algorithm, and the driving-and-braking switching rule and the corresponding driving / braking controlling torque are obtained. The torque is distributed by the lower controller to hub motors through vertical loads according to the ideal driving-and-braking torque calculated by the upper controller to allow wheels to harmoniously run. The number of actions of a driving actuator and a braking actuator is reduced, and the wheels tend to be in the best working state accordingly.

The invention relates to the field of coal mining, in particular to a method for large circle slope mining of a mining coal face. The method solves the problems existing in the slope adjustment of the prior mining coal face such as process disorder, low speed and low efficiency. The method comprises the following steps: slope adjustment proportion is determined; the working face is divided into sections; a coal mining machine feeds tools alternatively in a machine head and a mining section, the mining section is used as a slope adjustment section at the same time, the displacement space of a scraper-trough conveyer varies between the maximum cutting depth of the mining machine and zero to complete a small slope mining circle of each section, the scraper-trough conveyer is straightened when the last small slope mining circle is completed, and the working face is mined into a step shape; and at last the mining machine adopts an inclined cutting feed mode for cutting triangular coal for the machine head to complete cutting of triangular coal, and thus a large circle slope mining process is completed. The method improves the efficiency and speed of slope mining and production management level during slope mining, ensures safety effectiveness, reduces times for moving the working face, reduces the labor intensity of workers and is widely applicable.

The invention relates to a method for dynamically adjusting busbar voltage to improve grid connection efficiency. The working range of grid voltage from lowest limit to highest limit is divided into at least two levels and each level corresponds to a set busbar voltage directive value; and a control system detects the effective value of the grid voltage in real time, and when the grid voltage is within one level, if the busbar voltage directive value at the moment is not equal to the set busbar voltage directive value corresponding to the level, the busbar voltage directive value is adjusted to the set value. Since the amplitude of the busbar voltage is dynamically adjusted according to the grid voltage value detected in real time, the invention has the advantages that the overall efficiency and the reliability of the grid-connected inverter are improved, the device stress is reduced and the service life of the capacitor is prolonged.

The invention discloses an extra-long working surface fully mechanized coal mining process, which belongs to the technical field of coal mining. Due to the adoption of the process, a fully mechanized mining working surface can be 1,500-3,000 meters in length. The process comprises the following steps of: arranging a hydraulic bracket 13 in an open-off cut, arranging scraper conveyors 14 below front and back top beams of the bracket 13, making a drum coal cutting machine 12 ride on a coal blocking side rack of the front scraper conveyor 14 on the working surface, driving the drum coal cutting machine 12 to walk on a front slipping rack under the action of electric traction through walking teeth, cutting the coal wall of the fully mechanized mining surface by using the drum coal cutting machine 12, making cut coal wall coal briquettes fall into the front scraper conveyor 14, and transporting out of the working surface; and injecting a liquid into top coal on the working surface through the hydraulic bracket 13, supporting a top beam, applying pressure to a top plate, crushing top coal, lowering a back beam of the bracket 13, making crushed top coal fall into a back scraper conveyor 14 from a coal feeding port behind the bracket 13, transporting coal to a reversed loader through a back scraping plate 14, and transporting coal out of the working surface through the reversed loader, the crusher and a belt conveyor.

The invention discloses a subsection split phase automatic-passing system of an electric railway and a split phase automatic-passing method of the subsection split phase automatic-passing system of the electric railway. According to the subsection split phase automatic-passing system of the electric railway, a first catenary and a second catenary are connected with a neutral section through a first electric subsection and a second electric subsection respectively, a first current transformer is connected to the portion, close to the first electric subsection, of the first catenary in series, a second current transformer and a first normally-open switch are connected in series, and then are connected to the first electric subsection in parallel, and a third current transformer and a second normally-closed switch are connected in series, and then are connected to the second electric subsection in parallel; a first voltage transformer and a second voltage transformer are connected with the tail end of the first catenary and the tail end of the second catenary respectively; a first pantograph detector is installed on a supporting column of the first current transformer, a second pantograph detector is installed on the first electric subsection, and a third pantograph detector is installed on the second electric subsection; the first current transformer, the second current transformer, the third current transformer, the first pantograph detector, the second pantograph detector, the third pantograph detector, the first voltage transformer, the second voltage transformer and the first normally-open switch are connected with a control unit. The subsection split phase automatic-passing system of the electric railway is simple in structure, small in investment and convenient to implement, subsection split phase automatic-passing operation of the electric railway can be achieved completely and more reliably, and the lockout function is achieved when the subsection split phase automatic-passing system is abnormal.

The present invention is one filter belt self-balancing corrector in sludge treating apparatus. The filter belt self-balancing corrector has a correcting signal generator with solenoid valve connected through pipe to the cylinder of the correcting executor, a correcting roller with one end possessing roller capable of shifting along a guide rack and the other end hinged via sliding bearing to a fixing seat, photoelectronic switches on seats on two sides of the filter belt and with output signals fed to the signal input of the electromagnetic directional valve. The present invention adopts no-contact filter belt deviation detecting technology, can avoid edge bending, scratching and tearing of the filter belt, and results in raised reliability and stability.

The invention discloses an opening device for an outer package of containers and belongs to the technical field of pharmaceutical production devices. The opening device for the outer package of the containers comprises a film cutting device and a film overturning device, wherein the film cutting device is used for cutting packaging film on three side surrounding faces of a bottle packaging material and enabling top film and bottom film of the packaging film to keep connection only at one connection edge, and the film overturning device is used for clamping the side, opposite to the connectionedge, of the top film and enabling the top film to be overturned upwards around the connection edge to be opened. The opening device for the outer package of the containers reduces the action times ofan execution mechanism and significantly improves the work efficiency of a bale breaker. The opening device for the outer package of the containers has the advantages of being simple in structure, high in work efficiency and the like.

The invention discloses a voltage-active-clamping non-transformer-type single-phase photovoltaic inverter which comprises an energy storage voltage dividing unit, a full-bridge inverting unit, an active-clamping unit and a filtering unit. When the inverter works, seven power switches with anti-parallel diodes work in an coordinated-action mode, so that when the inverter outputs the zero level, an alternating side carries out current following, the common-mode voltage is subjected to clamping to reach 1 / 2 of direct-current input voltage, accordingly, the fact that the common-mode voltage is constant in the whole cycle is guaranteed, then complete removing of common-mode current is achieved, and needed bus voltage is only half of a half-bridge type circuit. Meanwhile, unipolarity pulse width modulation is used, output current ripples are small, the size and the weight of a filter are reduced, meanwhile, loss on a magnetic element is lowered, on-off action frequency is low during an on-off cycle, switch loss is lowered, accordingly, the inverter is high in output efficiency, and the inverting efficiency as high as 98% can be obtained.

The invention provides a hand-held cable continuity test device for a rail vehicle. The bus switch module (A) of the device is provided with a cable end. The contacts of A are connected with an idle bus and a test bus respectively. Each bus is connected with a grounding end through the contacts of grounding switch modules (B). Drive and grounding ports are arranged. Each switch module is providedwith an enable end and contacts. The slave device of the system comprises the hand-held cable continuity test device, control and communication modules, a power supply, a power supply switch module (C) and a voltage measurement circuit. The power supply is connected with the test bus through the contacts of C. The control module is connected with the drive. The enable end is connected with contacts and the drive. Short circuit and continuity test is carried out on a connected first cable. A master device determines a corresponding test result. Next cables on the same A are tested in reverse order until the last one. The test comprises the steps that the master device sends a test signal to the slave device; and the slave device controls the contact action of the slave device, and notifiesthe master device to control the contact action after switching. The test result is determined according to voltage. The volume is small, and the speed is fast.

The invention discloses a grid automatic voltage control method and system based on multi-objective optimization. The method comprises a step of discretizing continuous reactive power resource expected values and participating in gird automatic voltage control with discrete reactive power resources, a step of converting a gird automatic voltage optimization control problem into a multi-objective discrete variable optimization problem with boundary conditions and obtaining an optimal solution according to an artificial intelligence algorithm, a step of solidifying each discrete reactive power resource expected value in the optimal solution, at the same time, carrying out secondary voltage control solution for pilot bus voltage in each region in the optimal solution to obtain an expected value of each continuous reactive power resource. According to the method and the system, multiple optimization objectives such as the reduction of the number of times of action of switching devices andthe reduction of network loss are comprehensively considered, the unified and coordinated optimization of discrete and continuous reactive power resources are effectively realized only through one time of global optimization, the optimization efficiency is extremely high, and the method is established based on a traditional AVC system and is easy to implement.