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CN-121983938-A - Efficient diesel storage power supply system for engineering mechanical load and implementation method

CN121983938ACN 121983938 ACN121983938 ACN 121983938ACN-121983938-A

Abstract

The invention discloses and provides a high-efficiency diesel-electric power storage and supply system for engineering machinery and an implementation method thereof. The invention comprises a diesel generator CF, an AC/DC rectifier MK, an incoming line watt-hour meter 1DD, an outgoing line watt-hour meter 2DD, a DC/AC inverter NBQ, an energy storage unit BU, an energy management unit EMS and the like. The output power of the diesel generator CF is regulated in a mode of charging or discharging the energy storage unit BU, so that the output power of the diesel generator CF is always kept between 60 and 80 percent of the rated power of the diesel generator CF, and the optimal power generation efficiency is achieved. The invention is applied to the technical field of diesel storage power supply systems.

Inventors

  • LI XIAOBIN

Assignees

  • 珠海泰坦科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (7)

  1. 1. The high-efficiency diesel-electricity-storage power supply system for engineering mechanical load is characterized by comprising a diesel generator (CF), an AC/DC rectifier (MK), an incoming line kilowatt-hour meter (1 DD), an outgoing line kilowatt-hour meter (2 DD), a DC/AC inverter (NBQ), an energy storage unit (BU) and an energy management unit (EMS); the AC input end of the AC/DC rectifier (MK) is connected with the output end of the diesel generator (CF), the DC output end of the AC/DC rectifier (MK) is connected with a DC BUs, the energy storage unit (BU) is connected with the DC BUs, the DC input end of the DC/AC inverter (NBQ) is connected with the DC BUs, the AC output end of the DC/AC inverter (NBQ) is connected with an engineering mechanical load (M), the incoming line kilowatt-hour meter (1 DD) is connected between the output end of the diesel generator (CF) and the AC input end of the AC/DC rectifier (MK), the outgoing line kilowatt-hour meter (2 DD) is connected between the output end of the DC/AC inverter (NBQ) and the input end of the engineering mechanical load (M), and the communication ports of the energy meter management unit (EMS) are respectively connected with the AC/DC rectifier (MK), the incoming line kilowatt-hour meter (1 DD), the outgoing line kilowatt-hour meter (2), the DC/AC inverter (NBQ) and the engineering mechanical load (NBQ), the communication port of the energy storage unit (BU) is connected.
  2. 2. The efficient diesel power storage and supply system for engineering machinery load according to claim 1, wherein the rated power configuration of the diesel generator (CF) can be smaller than the rated power of the engineering machinery load, and is generally 0.5-0.8 times of the rated power of the engineering machinery load.
  3. 3. A high efficiency diesel storage and power supply system for engineering mechanical load according to claim 1 wherein the power factor of the AC/DC rectifier (MK) is greater than 0.98 and the harmonic injected into the power grid is less than 5%.
  4. 4. The efficient diesel-electric power storage system for engineering mechanical loads according to claim 1 is characterized in that the incoming line kilowatt-hour meter (1 DD) is used for measuring output electric quantity of the diesel generator (CF) and comprises power and electric degree, and the outgoing line kilowatt-hour meter (2 DD) is used for measuring electric quantity of the engineering mechanical load (M) and comprises power and electric degree.
  5. 5. A high efficiency diesel and electric power supply system for construction machine loads according to claim 1, characterized in that the AC/DC rectifier (MK) puts the energy storage unit (BU) in a charged or discharged state by regulation of the DC BUs voltage for balancing the output power of the diesel generator (CF).
  6. 6. A high efficiency diesel storage and power supply system for a construction machine load according to claim 1, wherein said energy management unit (EMS) regulates the output voltage of said AC/DC rectifier (MK) in real time according to the power of said construction machine load (M), and regulates the output power of said diesel generator (CF) by charging or discharging said energy storage unit (BU) so that the output power of said diesel generator (CF) is always maintained between 60-80% of its rated power to achieve optimal power generation efficiency.
  7. 7. The method for realizing the efficient diesel storage power supply system for engineering mechanical load according to claim 1, which is characterized in that the method comprises the following steps: a. In order to adapt to the actual field operation condition of the engineering machinery and improve the load rate of a diesel generator (CF), the rated power of the diesel generator (CF) can be configured to be 0.5-0.8 times of the rated power of the engineering machinery load (M), and the load which exceeds 80% of the rated power of the diesel generator (CF) in operation is borne by the energy storage unit (BU); b. The AC/DC rectifier (MK) is a rectifying module for converting alternating current into direct current, the power factor is larger than 0.98, the harmonic wave injected into a power grid is smaller than 5%, the alternating current generated by the diesel generator (CF) is converted into direct current through the AC/DC rectifier (MK) and then is connected into the DC bus, so that the power factor of the diesel generator (CF) is changed from 0.2-0.75 for directly supplying power to the engineering mechanical load (M) to be larger than 0.98, the harmonic wave is smaller than 5%, the reactive loss of the diesel generator (CF) is reduced, and the load capacity of the diesel generator (CF) is improved; c. -said DC/AC inverter (NBQ) converting an unstable direct current into a stable alternating current output, the input of said DC/AC inverter (NBQ) being powered by said DC bus, the alternating current output of which powering said work machine load (M); d. The incoming line kilowatt-hour meter (1 DD) is connected with the output end of the diesel generator (CF) and is used for measuring the output electric quantity of the diesel generator (CF) and comprises power and electric quantity, and the outgoing line kilowatt-hour meter (2 DD) is connected with the output end of the DC/AC inverter (NBQ) and is used for measuring the electric quantity of the engineering mechanical load (M) and comprises power and electric quantity; e. -said energy storage unit (BU) is connected to said DC BUs, said AC/DC rectifier (MK) placing said energy storage unit (BU) in a charged or discharged state by regulation of said DC BUs voltage for balancing the output power of said diesel generator (CF); f. The energy management unit (EMS) is respectively connected with the AC/DC rectifier (MK), the incoming line kilowatt-hour meter (1 DD), the outgoing line kilowatt-hour meter (2 DD), the DC/AC inverter (NBQ) and the communication port of the energy storage unit (BU), and the energy management unit (EMS) regulates the output voltage of the AC/DC rectifier (MK), namely the DC BUs voltage, in real time according to the power of the engineering mechanical load (M), regulates the output power of the diesel generator (CF) in a mode of charging or discharging the energy storage unit (BU), so that the output power of the diesel generator (CF) is always kept between 60-80% of the rated power of the diesel generator (CF) to achieve the optimal power generation efficiency; g. when the energy storage unit (BU) is fully charged and the engineering mechanical load is in a low-power or no-load condition for a long time, the energy management unit (EMS) turns off the diesel generator (CF), the engineering mechanical load (M) is powered by the energy storage unit (BU) through the AC/DC inverter (NBQ) until the energy stored by the energy storage unit (BU) is discharged to a lower limit, and then the diesel generator (CF) is started to charge the energy storage unit (BU) and power the engineering mechanical load according to the control strategy in the step f.

Description

Efficient diesel storage power supply system for engineering mechanical load and implementation method Technical Field The invention is applied to the technical field of diesel storage power supply systems, and particularly relates to a high-efficiency diesel storage power supply system for engineering machinery and an implementation method. Background Because no commercial power is supplied during the early construction of the construction site, some construction engineering machines such as a tower crane, a static pressure pile machine, a movable crusher, an air compressor, a stirrer and the like are generally powered temporarily by a diesel generator until the commercial power can be supplied, and the time period is generally 2-4 months. The pure diesel generator power supply mode adopted at present has the following problems: 1) In order to meet the impact load demand, the power configuration of the diesel generator is far greater than the actual load demand, and the ratio of the power of the diesel generator to the rated power of the engineering machinery is generally configured according to 3:2; 2) When the engineering machinery motor operates, the actual power is mostly 0.1-0.7 times of rated power, the power fluctuation is large, short-time impact load occasionally occurs, the power factor is 0.2-0.75, so that the load rate of the diesel generator is lower, the operating loss is high, the power generation efficiency is low, the operating cost is high, and the like; 3) The diesel generator is characterized in that the load rate/power generation capacity relation of the diesel generator is an inverted U-shaped curve, namely the optimal power generation efficiency is that the load rate is 60-80%, the oil consumption is obviously increased when the load rate is lower or higher than the load rate, and the oil consumption is obviously increased as shown in the following table: Load factor Per liter of diesel generating capacity (kWh/L)Description of the invention≤30%About 2-2.5 kWh/LThe combustion efficiency is obviously reduced at low load, the oil consumption is increased, and even carbon deposition and equipment damage can be caused by incomplete combustion.60~80%About 3.5 to 5 kWh/LThe diesel generator is a gold load zone of the diesel generator, and has the advantages of highest combustion efficiency, lowest oil consumption and maximum unit power generation.100%About 3-3.5 kWh/LThe efficiency of full-load operation is slightly reduced, the combustion tends to a rich state, partial fuel oil cannot be fully combusted, and the oil consumption is increased. In order to improve the power generation efficiency of the diesel generator, the prior art generally adopts an energy storage and diesel generator mode, namely, the diesel generator is used for firstly charging an energy storage system on site, and the energy storage system supplies power to the motor load of the engineering machinery after the charging is completed. For example, chinese patent publication CN119467083a discloses a diesel generator set with an energy storage power source, which includes a power generation mechanism, a battery module, and the like. This mode can solve the problem of low power generation efficiency of the diesel generator, but has the following disadvantages: 1) After the energy storage system is charged, the energy storage system generates power for the load, and the electric energy loss is at least more than 10% after the process of charging and discharging; 2) The diesel generator in the mode needs to be started and stopped frequently, and a large amount of diesel is consumed for each start of the diesel generator, so that the energy-saving effect is reduced; 3) Because the working time of the construction site engineering machinery is generally longer than 12 hours every day, the use of the mode that the energy storage system is fully charged and then the energy storage system supplies power to the engineering machinery can influence the service efficiency of the engineering machinery. Therefore, how to provide a new power supply system for engineering machinery with obvious energy-saving effect on the premise of not changing the working mode of the existing engineering machinery is the problem to be solved. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a high-efficiency diesel-electric power storage and supply system for engineering machinery and an implementation method. The efficient diesel-electricity-storage power supply system for engineering mechanical loads comprises a diesel generator CF, an AC/DC rectifier MK, an incoming line watt-hour meter 1DD, an outgoing line watt-hour meter 2DD, a DC/AC inverter NBQ, an energy storage unit BU and an energy management unit EMS, wherein the alternating current input end of the AC/DC rectifier MK is connected with the output end of the diesel generator CF, the direct current output end o