94results about How to "Reduce configuration capacity" patented technology

The invention provides a block chain electricity transaction peak shaving and frequency modulating system based on distributed electric storage facilities. The block chain electricity transaction peakshaving and frequency modulating system comprises a household block chain electricity meter (1), distributed electric storage facilities (2) and a block chain control cloud platform (3) with a charge-discharge peak shaving and frequency modulating control function. The charge wall and storage battery charge-discharge system is arranged inside a regional power grid (4), the block chain control cloud platform (3) is used, intelligent control is carried out on the charge-discharge system in combination with an intelligent bidirectional electricity meter of a belt block chain module, a great dealof electricity is stored when the price for electricity is at a low ebb at night, and electricity is sold at high price at peaks demand for electricity in daytime, so that the design capacity of a transmission and distribution network can be greatly reduced, and the difference between peak and valley of the power grid can be optimally and flexibly balanced; and moreover, auxiliary service such aspower grid peak shaving and frequency modulation based on storage batteries can be carried out by using an intelligent contract of block chains.

The invention discloses a photovoltaic and micro gas turbine mixed micro grid coordinated operation control method. According to the frequency characteristics of photovoltaic and load power, a frequency conversion long-time series method is put forward to predict the photovoltaic and load power so as to adjust the previous output of power of a micro gas turbine. During the synchronous operation of a mixed micro grid, by using the controllable smooth photovoltaic power fluctuation of the micro gas turbine, the mixed micro grid becomes a schedulable power source; and during island operation, a prediction algorithm is added in the power control of the micro gas turbine, and the output of the micro gas turbine is previously scheduled, so that the difference of the photovoltaic and load power is commonly compensated by the micro gas turbine and an energy storage battery, thereby realizing the stable operation of the mixed micro grid. According to the invention, the fluctuation of a photovoltaic generation system can be decreased, and the problems of slow dynamic response speed and delay of the micro gas turbine can be overcome, so that the coordinated operation control of the mixed micro grid under synchronous and island states can be realized.

The invention discloses a capacity optimization configuration method for a combined heat and power generation micro grid containing a heat pump. The method comprises a step 1 of establishing a micro-grid system model; a step 2 of introducing a heat pump into a combined heat and power generation micro grid and establishing an operation strategy of the combined heat and power generation micro grid containing the heat pump; a step 3 of establishing a capacity optimization configuration model of the combined heat and power generation micro grid containing the heat pump; a step 4 of solving the capacity optimization configuration model of the combined heat and power generation micro grid containing the heat pump by using a genetic algorithm. The method solves a problem that combined heat and power generation micro grid capacity optimization configuration in the prior art is not performed in the aspects of decreasing conventional energy sources, reducing wasted wind, and increasing system economic benefit so that a conventional system is high in using cost and poor in economic benefit.

The invention discloses a renewable energy source cooling, heating and power microgrid system and a control method. The renewable energy source cooling, heating and power microgrid system comprises a power module and a cooling / heating module. According to the power module, a solar power generation system is sequentially connected with a DC / DC converter and a DC / AC converter in series and then connected with an AC bus, a wind power generation system is sequentially connected with an AC / DC converter and a DC / AC converter and then connected with the AC bus, a gas internal combustion generation system is directly connected with the AC bus, a storage battery pack is connected with the AC bus through a bi-directional DC / AC converter, variable power electricity storage hot water tanks are connected with the AC bus, and the AC bus is connected with a power distribution network through a PCC. The renewable energy source cooling, heating and power microgrid system and the control method have the advantages that clean renewable energy sources such as methane, wind energy and solar energy are adopted as energy sources of a cooling, heating and power microgrid, no pollution is caused to the environment, operation cost is very low, and the application range is wide; by the adoption of a multi-microsource energy supply mode, the problem of capacity allocation redundancy of a single energy supply system can be solved.

The invention relates to a hybrid vacuum sweeper. A chassis is provided with an engine, a gear transfer case, a silicon rectifying generator, a storage battery, a power converter, a motor, a dustbin, a suction tube, a suction cup, a fan, a water tank and a water pump. The engine drives the silicon rectifying generator and the fan respectively. The silicon rectifying generator is connected with the power converter and the storage battery to output generated electric current. The power converter is connected with the motor to drive a rear axle shaft to drive the vacuum sweeper to run. The fan sucks dust and garbage on the ground in front of the suction cup into the dustbin through the dustbin, the suction tube and the suction cup. The water pump pumps water from the water tank to control the dust in the suction tube and the suction cup by a wet method. In the invention, a hybrid drive technology is applied to a special urban environment sanitary vehicle with vehicle-mounted operating devices, and the special vehicle has an oil-saving effect due to the use of a single engine as well as good operation effects; and a hybrid drive mechanism continuously generates electricity and overcomes the drawback that an electrical vehicle can not work for a long time due to the limitation from the capacity of the storage battery.

The invention provides a block chain virtual storage battery charging and discharging management system. The system comprises a regional power grid (1), a virtual storage battery block chain control cloud platform (2) and a virtual charging and discharging system. The virtual charging and discharging system is arranged in the regional power grid (1), the virtual charging and discharging system isintelligently controlled with the combination of an intelligent bidirectional ammeter provided with a block chain module by employing the virtual storage battery block chain control cloud platform (2), power is greatly stored with a low price during a valley period at night and sold with a high price during a power consumption peak at daytime, the design capacities of power transmission and distribution networks can be greatly reduced, the power grid peak-to-valley difference can be flexibly balanced in an optimal manner, and auxiliary services including peak load regulation and frequency modulation of the power grid based on the virtual charging and discharging system can be realized by employing a smart contract of a block chain.

The invention discloses a phase modifier stationing method for preventing multi-DC chain commutation failure, and belongs to the technical field of automation of a power system. A region with a relatively high risk that other DCs are simultaneously or sequentially failure in commutation caused by a commutation failure of a certain DC according to a multi-fed interactive factor is judged, the region is used as an installation region of a phase modifier, and the optimal phase modifier installation place is obtained by calculating and sequencing reactive power improvement control estimation indexes of the phase modifier. By the method, the problems that the commutation failure is judged only by voltage drop of a commutation bus and the inconsistency of a result and an actual condition probably caused by a relevant phase modifier configuration index obtained according to the type of the commutation failure cannot be effectively reflected are solved, and the configuration capacity of the phase modifier is reduced to the great extent on the basis of ensuring rapid recovery of the DC with commutation failure.

The invention provides a stimulating type demand response-based micro power grid load shedding control method which comprises the following steps: an aim of minimum dispatching cost is set so as to build a stimulating type demand response-based power grid side economic dispatching model; an aim of minimum user economic loss is set to build a user side response module; moreover, current operation condition of a micro power grid is obtained; the power grid dispatching model and the user response model are subjected to solving operation; according to a solving result, whether to conduct stimulating type demand responding operation or direct loading shedding operation is determined. Via use of the load shedding control method put forward in the invention, demand side resources can be used as substitutable resources for micro power grid distributed electric power generation and energy storage; micro power grid investment and operation cost can be lowered, load power failure frequency and power failure time can be reduced, and reliability of micro power grid power supply can be improved.

The invention discloses a method for optimizing the capacity configuration of a combined cooling, heating and power system considering a translatable load, which relates to the field of micro-grid design and planning. The invention adopts the pumped storage energy as the energy storage device of the system, and optimizes the capacity allocation method of the cogeneration system considering the energy management of the load side. Firstly, according to the translatable characteristics of the thermoelectric load, the energy management model of the user side is established, which takes into account the matching degree of the output of the distributed generation and the power demand of the user side, and the matching degree of the thermoelectric ratio of the energy supply side and the user side. A comprehensive index model of combined cooling, heating and power system considering economy and environmental protection is proposed, and the capacity of each equipment is optimized by particle swarm optimization algorithm. The simulation results show that the combined cooling, heating and power system can cut the peak and fill the valley of the distributed power output and reduce the comprehensive cost of the system after the load shifting and the introduction of pumped storage device, and the effectiveness of the model is verified.

The present invention pertaining to the computer network communication technology field provides a SDH network planning and designing method of multi-module fibers, concretely relates to the fiber SDH network planning and designing and also relates to resource management and maintenance of the optical SDH network. According to the present invention, the cost of network fiber is made the minimum after the planning and designing under the condition that communication state between nodes, node positions and service requirements are known, and the given modularized fiber type is STM model. The method comprises the steps of service ordering, routing for each service and performing fiber resource configuration from the high service to the low service, and optimizing the fiber module cost to all the links. The present invention realizes that under the condition that the network topology and service requirements are known, whole planning of SDH mesh network with un-given upper limit of link capability is performed, and routing distribution and LSP resources are optimized through the multi-modularized weighting set, resource distribution and multi-modularized fiber cost optimization, under the condition that the network devices and the like are satisfied, finally, the configuration of the network link capability is close to the minimum.

The invention provides a control method and a control system for wind power participating frequency modulation of an electric power system. The control method comprises regulating and controlling the frequency of the electric power system by using rotor kinetic energy and a storage battery energy storage system. According to the control method for wind power participating frequency modulation of the electric power system based on combined effect of the rotor kinetic energy and the storage battery energy storage system, the wind energy is sufficiently utilized, the configuration capacity of the energy storage system is reduced, and the economical efficiency of wind field operation is improved. The control method and the control system can also play better roles even under the condition of relatively great load disturbance.

The invention discloses a capacity optimization and configuration method considering a flexible load of a combined cooling, heating and power system, and relates to the field of combined cooling, heating and power system design and planning. The capacity optimization and configuration method comprises the steps of firstly, building energy hub-based CCHP system energy flow model, and analyzing a complicated coupling relation among energy sources in the system; secondly, making a demand-side energy management strategy with coordinated source-network-load-storage and considering the flexible load; and finally, building an optimization model considering the flexible load by comprehensively considering running economy and grid-connected safety of a CCHP system with regards to the problem of capacity optimization and configuration of a distributed power supply in a grid-connected combined cooling, heating and power system. An example verifies the practicability and effectiveness of the proposed strategy.

The invention discloses a power grid primary frequency modulation control method based on battery energy-storage power source and a system thereof. A grid frequency is monitored in real time; a grid frequency deviation absolute value is calculated in real time based on a rated value of the grid frequency; if the grid frequency deviation absolute value is greater than or equal to a preset grid frequency stability threshold, an output model of an energy-storage power source is determined based on a grid frequency deviation change rate; and when the grid frequency deviation absolute value is stabilized to be a steady-state frequency deviation value, frequency modulation end is completed. According to the invention, the corresponding output model of the energy-storage power source is designedbased on a disturbance type design; and the effect of the primary frequency modulation is improved, the capacity configuration of the energy-storage power source is reduced, and the service life of the energy-storage power source is prolonged.

The invention relates to a compound-drive vacuum sweeper. The vacuum sweeper comprises an engine, a gear box, a silicon rectifying generator, a storage battery, a power converter and a motor A, which are all arranged on a chassis, wherein the engine drives a transmission shaft and a rear axle shaft through the gear box to drive the vacuum sweeper to run. The engine drives a power takeoff and the silicon rectifying generator through the gear box. The silicon rectifying generator is connected with the power converter and the storage battery to output generated electric current. The power converter is connected with the motor A which drives a fan and a water pump respectively. The fan sucks dust and garbage on the ground in front of a suction cup into a dustbin through the dustbin, a suction tube and the suction cup. The water pump pumps water from a water from a water tank to control dust by a wet method. The technology of the invention is applied to a special urban environment sanitary vehicle with vehicle-mounted operating devices, and the special vehicle has an oil-saving effect due to the use of a single engine as well as good operating effects. A compound drive system of compound-drive vacuum sweeper can generate electricity continuously and overcomes the drawback of short operating time of the electrical vehicle due to limitation from the capacity of the storage battery.

The invention discloses a wind power layered smoothing system taking regard of response from a demand side, and a method thereof. The method comprises the following steps: 1) establishing a source-load-storage interactive layered smoothing model including a wind power time-of-use power price mathematical model, a charging and discharging state model for an energy storage device, a load layered optimization wind-power power smoothing model, and an energy storage device charging and discharging state optimization model; and 2) based on a PSO particle swarm optimization algorithm, calculating the models, and obtaining the optimal scheme for translatable load operation and scheduling and for energy storage device charging and discharging. The wind power layered smoothing system taking regard of response from a demand side, and the method thereof enable the load to effectively track a wind turbine generator system to output capacity, can reduce the volatility for outputting wind-power power on a junctor to smooth outputting of the wind-power power and improve the economical efficiency for power purchase in the system for users.

The invention discloses a cleaning method and a cleaning device for an ink wiping roller of a gravure press. The cleaning device comprises a scraper arranged on the lower side of a wiping roller and hair brushes, and is characterized by comprising a spray structure and a soaking structure which are arranged in a wiping tank, wherein the spray structure can spray a cleaning fluid to the ink wiping roller, and the cleaning fluid flows into the soaking structure, so that a cylindrical surface of the ink wiping roller can be soaked and wiped continuously, and a hybrid ink wiping roller cleaning device is formed. The cleaning method comprises the steps of wiping ink through spraying and wiping the ink through soaking, wherein in the step of wiping the ink through spraying, the cleaning fluid is collected below a roller body of the ink wiping roller, the roller body is soaked, and a preset fluid level is kept horizontal, so that the cylindrical surface of the ink wiping roller can be further soaked and wiped, and the cleaning fluid and the ink remained on the roller body are scraped by the drying scraper. According to the method and the device, soaking type ink wiping and spraying type ink wiping are combined, and the cylindrical surface of the ink wiping roller is wiped by soaking and intensively wiped by spraying, so that the fluid amount can be reduced, and the consumption of related chemicals and water resources can be reduced.

The invention discloses a direct current furnace condensate recovery system and method based on high and low pressure condensate flash tanks. The direct current furnace condensate recovery system comprises a separator, a separator water storage tank, the high pressure condensate flash tank, the low pressure condensate flash tank, a deaerator, a condenser, a unit drain tank, other steam users and astarting condensate pump. Condensate of the separator passes through the separator water storage tank to enter the high pressure condensate flash tank. Steam in the high pressure condensate flash tank is conveyed to the deaerator and other steam users for heat recovery, redundant steam is discharged to the low pressure condensate flash tank and is discharged to the atmosphere through an exhaust pipe. When water is qualified, the condensate is discharged to the deaerator for heat recovery, or redundant condensate is discharged to the condenser, and the working medium is recovered. When water is unqualified, the condensate is discharged into the low pressure condensate flash tank and is discharged to the unit drain tank through the starting condensate pump.

The invention discloses an energy management strategy of a hybrid energy storage system, relates to an energy management strategy of a microgrid hybrid energy storage system, and belongs to the technical field of microgrid energy storage. The energy management strategy comprises the following three power distribution processes: firstly, pre-distributing a power of the energy storage system to a storage battery and a super capacitor under the premise of ensuring that the power of the hybrid energy storage system is invariable; then carrying out secondary power distribution on the basis of pre-distribution according to a power value flowing between the storage battery and the super capacitor; and finally carrying out final distribution by considering charge and discharge limitations and constraints of energy storage units on the basis of secondary distribution, and fully developing the characteristics of the energy storage units. Advantages complementation is formed among the energy storage units, so that the performance of the energy storage system is improved.

The invention discloses an on-line control method of a big climbing rate event of battery energy storage stabilized photovoltaic power generation. The on-line control method of the big climbing rate event of battery energy storage stabilized photovoltaic power generation comprises the following steps: confirming MPC control variables based on the statistical results of the duration of climbing events throughout a year, wherein the MPC control variables comprise control period, control time domain and optimizing time domain; confirming charging and discharging rules according to the energy storage capacity of the energy storage system and the photovoltaic climbing rate in the MPC control time domain; confirming the action state of the energy storage system at the next moment; establishing aMPC optimizing control model; and executing the calculation results by the energy storage system according to the idea of rolling optimization. According to the invention, the stabilizing is performed only aiming at the big climbing rate events that the photovoltaic output fluctuation exceeds a certain range, therefore, the configuration capacity and charging and discharging times of the energy storage system can be reduced; and the control error for the energy storage system is reduced through continuous rolling optimization, therefore, photovoltaic power generation can be effectively stabilized.

The invention provides a three-wheel road sweeper driven by mechanical and electric hybrid power. The road sweeper is provided with two power sources, namely an engine and a storage battery; under the condition that a vehicle-mounted working device is driven to work stably, the engine also drives a generator and is connected with a motor A through a motor controller to drive the road sweeper to run at variable speed; the generator is simultaneously connected with the storage battery; the storage battery is also connected with the motor A through the motor controller; the part of the instantaneous power generation quantity of the generator, which is greater than the demand of the motor A, charges the storage battery; the part of the instantaneous power generation quantity of the generator, which is smaller than the demand of the motor A, is supplied by the storage battery; and the storage battery alternates charge and discharge. The road sweeper is small, flexible in turning, strong in working capability and good in dust control effect; compared with a four-wheel road sweeper, the invention has the advantages that the three-wheel road sweeper is suitable for sweeping bicycle lanes and sidewalks and is particularly suitable for sweeping urban laneways; compared with a micro road sweeper, the invention has the advantages that the three-wheel road sweeper is strong in working capability, and an operator is not subjected to pollution of automobile exhaust and dust due to an air conditioner; and compared with a pure electric road sweeper, the invention has the advantages that the three-wheel road sweeper can unlimitedly and continuously work.

The invention discloses a shielding door-based urban metro station ventilating method and a shielding door-based urban metro station ventilating system. The method comprises the following steps: in the air-conditioner-use season, a station public area is isolated from a running tunnel; the air temperature and humidity of the station public area are guaranteed through a station public area air conditioning system, and ventilation of the running tunnel is guaranteed through a running tunnel ventilating system in the running tunnel; and in the non-air-conditioner-use season, the station public area communicates with the running tunnel as required, and ventilation from the station public area to the running tunnel is realized according to a train piston effect. The system comprises the station public area air conditioning system, the running tunnel ventilating system and a shielding door for isolating the station public area from the running tunnel; hanging plate tuyeres (1) and a control actuation device (2) are arranged on the shielding door; and the control actuation device (2) controls the hanging plate tuyeres (1) to be closed or opened so as to isolate the station public area from the running tunnel or communicate the station public area with the running tunnel.

The invention relates to distributed generation and distribution network optimization scheduling, in particular to an upper and lower double-layer optimization theory based distributed generation coordination optimization scheduling method. The method includes: S1: determining a distribution network layer optimization objective function; S2: determining constraint conditions that the distributionnetwork layer optimization scheduling should satisfy; S3: constructing a microgrid layer; S4: determining a microgrid layer optimization objective function; S5: determining constraint conditions thatthe microgrid layer optimization scheduling should satisfy; and S6: performing distribution network layer and microgrid layer coordinated optimization scheduling. The distribution network and the microgrid coordinate with each other, and the upper and lower layers interact with each other, and finally the economic scheduling of the distributed power source can be achieved. Due to the introductionof the distributed power sources, the stability and reliability of the distribution network are improved significantly. Moreover, because the upper layer management of the microgrid is performed at the distribution network level, the clean energy of the microgrid is fully utilized, the abandoned wind and light are reduced; the capacity allocation of a energy storage unit is reduced because the microgrids are connected to each other through the distribution network. Furthermore, suggestions and basis are provided for optimal scheduling of the distribution network.

The invention provides a black-start method and system with multi-source coordination. According to the method, a diesel generator, a photovoltaic power station, an energy storage system and a wind power plant are taken as a starting power source in an orderly manner phase by phase, and black start of a regional power system is completed gradually. The starting process of the method comprises three phases: in the first phase, the diesel generator and the photovoltaic power station are taken as the starting power source for supplying power to an electric bus used for the wind power plant and charging the energy storage system; in the second phase, the diesel engine, the photovoltaic power station and the energy storage system are commonly taken as the starting power source, and all wind turbine generator sets in the wind power plant are started batch by batch; and after the wind power plant is started, there comes the third phase: the wind power plant, the energy storage system, the diesel generator and the photovoltaic power station are commonly taken as the power source, and a thermal power plant is started. The black-start method and system with multi-source coordination has the advantages of fast starting speed and stable operation, and truly and effectively reduce power grid recovery time.

The invention discloses a wind power plant reactive power optimization configuration method based on double-fed induction fan reactive power generating capacity. The wind power plant reactive power optimization configuration method is characterized by comprising the steps such as quantitative calculation, a single wind power plant reactive power optimization configuration model and wind power plant reactive power optimization configuration, based on the double-fed induction fan reactive power generating capacity, obtaining a minimum reactive power output optimization result, meeting an objective function, of each unit, configuring a wind electric motor set power factor and an access point capacitive reactive compensation equipment configuration reference value, taking the actual wind speed of a region to conduct production simulation and detect feasibility of a configuration scheme, and obtaining an inductive reactive power configuration capacity reference value. The wind power plant reactive power optimization configuration method has the advantages of being simple in calculation, reasonable in result, easy to achieve, high in application value and the like. Large-scale reconstruction is not required to be carried out on an existing wind power plant, and on the premise that an existing fan control strategy is not changed, optimization of reactive power configuration of a double-fed induction fan wind power plant is achieved.

The invention discloses a multi-stage capacity configuration method and system for a park integrated energy system. The method comprises the following steps: firstly, analyzing the construction characteristics of a typical park integrated energy system, dividing the planning cycle of the park integrated energy system into a plurality of stages, gradually increasing the configuration capacity of each device in the park according to the year-by-year growth characteristics of loads, and establishing a multi-stage capacity configuration model of the park integrated energy system; then, on the basis of the known park integrated energy system topology, establishing an operation model of each energy conversion device, and meanwhile, considering various constraint conditions including energy balance, device output, energy storage charge and discharge and the like; secondly, considering the investment cost, the operation and maintenance cost and the equipment residual value of the system, and establishing an economical optimization objective function; and finally, verifying effectiveness and rationality of the model and the method in the aspect of capacity configuration of the park integrated energy system through example analysis. Reference can be provided for planning and equipment capacity configuration of the park integrated energy system.

The present invention relates a distribution system. The distribution system comprises an electric supply network, a generator, a storage battery and an alternating current electric device group; the electric supply network is configured to supply power to the alternating current electric device group when the electric supply network is normal; the generator is started when the electric supply network is abnormal; the storage battery is configured to supply power to the alternating current electric device group prior to the start completion of the generator. The distribution system further comprises an AC / DC conversion module configured to convert the alternating current of the generator to direct current of the generator after the start completion of the generator so as to output and supply to the storage battery; the AC / DC conversion module and the storage module are combined to supply power to the alternating current electric device group when the total demand power of the current operation load is larger than the preset power of the generator, or else, the AC / DC conversion module is configured to supply power to the alternating current electric device group and supply power to the storage battery. The distribution system further comprises a reactive compensation module. The distribution system is able to handle the load with pulsation power requirements, so that the capacity configuration of a generator is reduced.

The invention provides an energy optimization method and device for a light storage type electric vehicle charging station. According to the method and device, a cost coefficient is obtained; the costcoefficient is substituted into a pre-constructed energy optimization model, and the model is solved, so that an energy optimization result can be obtained. The energy optimization model comprises anobjecive function and a constraint condition, wherein the objective and is constructed by taking the minimum total energy consumption cost of the light storage type electric vehicle charging stationas an objective. According to the method and device of the invention, carbon emission during the operation of the light storage type electric vehicle charging station is considered, so that the obtained energy optimization result can reduce carbon emission treatment cost; the pre-constructed energy optimization model is solved by using a particle swarm algorithm, so that the convergence rate of the particle swarm algorithm is improved, and therefore, a better convergence effect can be obtained, and operation profit requirements and environmental pollution reduction requirements are well balanced; renewable energy sources can be utilized to generate power to the maximum extent on site; the operation cost of the light storage type electric vehicle charging station is reduced; the capacity configuration of energy storage equipment can be optimized; and initial investment is reduced.

The invention discloses a comprehensive station optimization operation method in a multi-station fusion mode. The method comprises the following steps: acquiring operation data of a comprehensive station in the multi-station fusion mode; establishing constraint conditions of the charge state, the charge and discharge power and the power balance of the energy storage power station, wherein the constraint conditions of the charge state and the charge and discharge power meet the constraint of the installation capacity of the energy storage power station; calculating the power supply load, investment cost, operation cost and power purchase cost of each power grid; and constructing a total cost function model, and solving to obtain a charging and discharging power optimization result of the energy storage power station and a load power optimization result participating in response by taking the minimum operation total cost as an objective function and utilizing various constraint conditions. By taking the minimum total cost as a target, the energy storage configuration capacity is reduced and the construction cost of a power grid is saved under the condition that the load requirement of the data center is met, the power utilization cost is saved by using the time-of-use electricity price, a theoretical basis and technical support are provided for urban multi-station fusion construction and operation, and the economical efficiency, environmental protection property and reliability of power station construction and operation are ensured.

The invention discloses a phase modifier optimal configuration method and system for suppressing new energy transient overvoltage. The method comprises the steps of calculating a new energy multi-station short-circuit ratio of each new energy connected to a target alternating-current and direct-current hybrid power grid and the transient overvoltage of each new energy when the target alternating-current and direct-current hybrid power grid breaks down; when the transient overvoltage of the new energy is greater than a transient overvoltage threshold, determining a new energy multi-station short-circuit ratio threshold according to the multi-station short-circuit ratio and the transient overvoltage of each new energy; configuring a phase modifier at the grid-connected point low-voltage side of the new energy with the minimum new energy multi-station short-circuit ratio, and recalculating the new energy multi-station short-circuit ratio of each new energy; when the new energy multi-station short-circuit ratio of each new energy is greater than or equal to a new energy multi-station short-circuit ratio threshold value, recalculating the transient overvoltage of each new energy; and when the transient overvoltage of each new energy is smaller than or equal to the transient overvoltage threshold, determining that the current phase modifier configuration scheme is the optimal phase modifier configuration scheme.

The invention provides a mechanical electric hybrid power driven three-wheeled road sweeper which is provided with two power sources of an engine and a storage battery. Under the circumstance of driving a vehicle-mounted working device, the engine further drives a generator to be connected with a drive motor controller, the generator is further connected with the storage battery, the storage battery can be connected with an external charger and connected with the drive motor controller, and the motor controller is connected with a drive motor A to drive the road sweeper to travel at variable speed. Part, of instantaneous generating capacity of the generator, more than requirement of the motor A is used for charging the storage battery, part of the instantaneous generating capacity of the generator, less than the requirement of the motor A is replenished by the storage battery, and the storage battery changes in floating charge and discharge. The three-wheeled road sweeper is small, flexible in steering, high in work capacity, good in dust control effect, more suitable for sweeping bicycle lanes and sidewalks as compared with four-wheeled road sweepers, particularly suitable for sweeping urban roadways, air-conditioned, free of pollution of vehicle exhaust and dust to operators, and capable of working continuously limitlessly as compared with pure electric road sweepers.