Energy storage container based on diesel generating set and applied to mining area

Abstract

The utility model discloses a diesel generator set-based energy storage container applied to a mining area. The diesel generator set-based energy storage container comprises an energy storage device, a power distribution container, a diesel generator container and a frequency converter container, four main generators and an auxiliary generator are arranged in the diesel generator container, the output ends of the four main generators are coupled on an alternating current bus, the output end of the auxiliary generator is connected into a power supply circuit through a switch, and meanwhile the switch is connected into a transformer through another switch. The transformer connects a power supply output by the auxiliary generator to the AC bus for coupling; and the alternating current bus is connected with the DSU1 and the DSU2 in the frequency converter container, and is connected with the frequency converter through the direct current bus to supply power to the frequency converter. According to the utility model, the generator set is combined with the battery cluster, so that redundant electric energy can be stored through the battery cluster, energy waste is reduced, and the capacity of the backup power supply in the whole mining area is guaranteed.

Description

Technical Field

[0001] The utility model relates to an energy storage container based on a diesel generator set and applied in a mining area. Background Art

[0002] In some existing power supply demand scenarios in weak-current areas abroad, such as some deep mountain construction sites, oil drilling rigs, and mining areas, when electricity is temporarily unavailable or construction is extremely difficult, diesel generators are often used to generate electricity for use by mining equipment. This method causes extremely high losses to the oil engine and high fuel costs. Once external factors such as climate temperature cause large-scale temporary failures or paralysis of the fuel engine, there is almost no backup power supply. As we all know, diesel engines are particularly sensitive to low temperatures. Once a large area of ​​low temperature environment occurs, it is very easy to cause the diesel generator set to be paralyzed, or when the temperature drops, delays in transporting fuel will have a fatal impact on the generator set. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a combination of a generator set and a battery cluster, which can store excess electrical energy through the battery cluster, reduce energy waste, and ensure the backup power supply capacity of the entire mining area. The diesel generator set is used in an energy storage container in the mining area.

[0004] The purpose of the utility model is achieved through the following technical solutions: an energy storage container based on a diesel generator set applied to a mining area, comprising an energy storage device, a power distribution container, a diesel generator container and a frequency converter container; a 600V 5000A AC bus, multiple switches and a transformer are arranged in the power distribution container; a DC bus, multiple frequency converters and two DSUs are arranged in the frequency converter container;

[0005] There are four main generators and one auxiliary generator in the diesel engine container. The four main generators couple their output ends to the AC bus 600V 5000A. A switch is set between each main generator and the AC bus. The output end of the auxiliary generator is connected to the power supply circuit through a switch, and the switch is connected to the transformer 600 / 400V through another switch. The transformer couples the power output of the auxiliary generator to the AC bus 600V 5000A.

[0006] The AC bus 600V 5000A is connected to DSU1 and DSU2 in the inverter container. DSU1 and DSU2 convert AC into DC and connect to the DC bus. They are connected to the inverter through the DC bus to power the inverter. The inverter is used to power other working equipment.

[0007] The energy storage device includes a boost transformer, a PCS, a battery cluster, a BMS and an EMS controller, wherein the PCS is connected to the boost transformer, the EMS controller and the battery cluster respectively, and the BMS is connected to the battery cluster and the EMS controller respectively;

[0008] The step-up transformer is connected to the 600V 5000A AC bus of the distribution container through a switch. The step-up transformer adopts SCB11-1000kVA, 380 / 600VDyn11, which is used to convert the 380V AC power generated when the PCS converts DC power into AC power into 600V AC power collected on the AC bus of the mining area.

[0009] The battery cluster includes 12 battery modules connected in series and a high-voltage box connected to the battery modules. The battery modules connected in series are connected to the high-voltage box, and then the output end of the high-voltage box is connected to the busbar of the busbar cabinet, and then connected to the DC input side of the PCS through a circuit breaker.

[0010] The high voltage box includes a DC circuit breaker, a DC / DC switching power supply, a fuse, a shunt, a battery control module BCU, a main positive contactor KM1, a main negative contactor KM2 and a pre-charge contactor KM3; the positive and negative poles of the battery cluster are connected to the positive and negative poles of the DC / DC switching power supply through a DC circuit breaker; the positive pole of the DC / DC switching power supply is connected to the fuse, and the fuse is respectively connected to the HV1+ port of the battery control module BCU and the main positive contactor KM1, and the fuse is also connected through a resistor R1 is connected to the pre-charging contactor KM3; the output ends of the main positive contactor KM1 and the pre-charging contactor KM3 are respectively connected to the HV2+ port of the battery control module BCU; the negative pole of the DC / DC switching power supply is respectively connected to the HV1- port of the battery control module BCU and the main negative contactor KM2, and the shunt is connected between the MT+ and MT- ports of the battery control module BCU. At the same time, the shunt is also connected to the circuit between the negative pole of the DC / DC switching power supply and the main negative contactor KM2.

[0011] The beneficial effects of the utility model are as follows: the utility model improves the power supply guarantee capability of the mining area and reduces the loss to the oil engine. The power generation of the traditional diesel generator set is relatively fixed. Once the load power consumption is low, there is no corresponding load to consume the power supply of the diesel generator set that is far greater than the load, which will cause waste. The utility model combines the generator set with the battery cluster, and the excess electric energy can be stored through the battery cluster. It can be used as a backup power supply during peak power consumption periods, reducing energy waste and ensuring the backup power supply capacity of the entire mining area. In addition, when a large area of ​​low temperature environment occurs, causing the diesel generator set to be paralyzed, or when the temperature drops and the transportation of oil is delayed, and the generator set cannot provide electricity in time, the battery cluster can also be used to power external equipment, thereby improving the stability of the power system in the mining area, and perfectly solving the problem of energy storage and balance, and promoting the integration and utilization of new energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the energy storage container of the utility model;

[0013] Figure 2 This is a schematic diagram of the battery cluster and high-voltage box structure of the utility model. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, the utility model is an energy storage container based on a diesel generator set used in a mining area, including an energy storage device, a power distribution container, a diesel generator container and a frequency converter container; the power distribution container is provided with a 600V 5000A AC bus, multiple switches, and a transformer; the frequency converter container is provided with a DC bus, multiple frequency converters and two DSUs;

[0016] There are four main generators and one auxiliary generator in the diesel generator container. The four main generators (1200kW / 600V three-phase AC synchronous generators) each couple their output ends to the AC bus 600V 5000A. The AC bus 600V5000A is a 600V 5000A 3P 50Hz bus. A switch is set between each main generator and the AC bus. The output end of the auxiliary generator (400kW / 400V three-phase AC synchronous generator) is connected to the power supply circuit through a switch, which can be used as a power source for office and living electricity in the mining area.

[0017] At the same time, the switch is connected to the transformer 600 / 400V through another switch, and the transformer connects the power output of the auxiliary generator to the AC bus 600V 5000A for coupling;

[0018] The AC bus 600V 5000A is connected to the diode supply units DSU1 and DSU2 (DSU, Diode Supply Unit, a type of rectifier module) in the inverter container. DSU1 and DSU2 invert AC into DC and connect to the DC bus 810V 4400A 2P. They are connected to the inverter through the DC bus to power the inverter. The inverter is used to power other working equipment, such as various mud pumps, winches, turntable motors, top drive TD, other motors, etc.

[0019] The energy storage device includes a step-up transformer, a PCS (energy storage converter), a battery cluster, a BMS (battery management system) and an EMS controller. The PCS is connected to the step-up transformer, the EMS controller and the battery cluster respectively, and the BMS is connected to the battery cluster and the EMS controller respectively. The step-up transformer adopts SCB11-1000kVA, 380 / 600VDyn11, which is used to convert the 380V AC generated by the PCS from DC to AC into 600V AC collected on the AC busbar in the mining area. EMS (Energy Management System) is the decision-making center of the energy storage system and plays the role of "brain". The energy management system includes a grid-level energy management system and a microgrid-level energy management system. The EMS used in the utility model adopts the microgrid level.

[0020] The step-up transformer is connected to the 600V 5000A AC busbar of the distribution container through a switch. The step-up transformer uses SCB11-1000kVA, 380 / 600VDyn11, which is used to convert the 380V AC generated when the PCS converts DC to AC into 600V AC collected on the AC busbar in the mining area. The charging process is generated by the main diesel generator inside the diesel generator container, and the electric energy is transmitted to the switch and transformer inside the energy storage container through the AC busbar 600V 5000A 3P 50Hz, and then the PCS converts the AC into DC to charge the battery cluster.

[0021] like Figure 2 As shown, the battery cluster includes 12 battery modules connected in series and a high-voltage box connected to the battery modules. The battery modules connected in series are connected to the high-voltage box, and then the output end of the high-voltage box is connected to the busbar of the busbar cabinet, and then connected to the DC input side of the PCS through a circuit breaker;

[0022] The high voltage box includes a DC circuit breaker (QF), a DC / DC switching power supply, a fuse (FU), a shunt, a battery control module BCU, a main positive contactor KM1, a main negative contactor KM2 and a pre-charge contactor KM3; the positive and negative poles of the battery cluster are connected to the positive and negative poles of the DC / DC switching power supply through a DC circuit breaker; the positive pole of the DC / DC switching power supply is connected to the fuse, which is respectively connected to the HV1+ port of the battery control module BCU and the main positive contactor KM1, and the fuse is also The pre-charging contactor KM3 is connected through the resistor R1; the output ends of the main positive contactor KM1 and the pre-charging contactor KM3 are respectively connected to the HV2+ port of the battery control module BCU; the negative pole of the DC / DC direct current switching power supply is respectively connected to the HV1- port of the battery control module BCU and the main negative contactor KM2, and the shunt is connected between the MT+ and MT- ports of the battery control module BCU, and the shunt is also connected to the circuit between the negative pole of the DC / DC direct current switching power supply and the main negative contactor KM2.

[0023] The DC circuit breaker is used to control the on / off of the entire battery cluster connected to the high-voltage box; the DC / DC switching power supply is used to convert the battery's 1500V DC power into 24V DC power for use inside the high-voltage box.

[0024] Fuse FU detects whether the entire DC circuit is overloaded or short-circuited. Once the load current or short-circuit current exceeds the safety setting, it will immediately operate to protect and cut off the positive pole of the entire DC circuit.

[0025] The battery control module BCU collects and gathers the battery information of the battery module, controls the on and off of KM1, KM2, and KM3. KM1 is the main positive contactor, KM2 is the main negative contactor, and KM3 is the pre-charge contactor. The battery control module BCU controls the batch action of the contactor after the high-voltage box is powered on. HV1+HV1- is the battery voltage collection port at the front end of the contactor, and HV2+HV1- is the battery voltage collection port at the back end of the contactor; MT+MT- is the shunt sampling port, that is, the current detection device in the DC circuit.

[0026] R1 is the pre-charge resistor, and its resistance is 20Ω: In order to avoid the main positive and negative contactors from being damaged by overcurrent and overheating: After the parallel resistor R1 is connected, the voltage at both ends of the circuit will not suddenly change when the power is turned on, but the current will suddenly change. At this time, the external load resistance is the resistance of the wire and the contactor contact, which is generally much less than 20mΩ, and the battery voltage is generally above 300V. At this time, it is equivalent to an instantaneous short circuit, generating an instantaneous current I=300 / 0.02=15000A, which will damage the main positive and negative contactors. After the parallel resistor R1 is connected, the current in the circuit is I=300 / 20=15A, which is much smaller than the original instantaneous current.

[0027] In the figure, FL is a shunt, which cooperates with the battery control module BCU to collect the current of the DC line.

[0028] The local EMS controller of the whole system is the core control part of the system operation. The EMS controller communicates with the BMS and PCS respectively to collect the status information of BMS and PCS. The EMS controller realizes the charging and discharging of the energy storage part by controlling the PCS control. When the power load is low, the whole energy storage system can be controlled to charge the battery part to store energy. During the peak period of power consumption or when the diesel unit cannot work, the energy storage part discharges to provide backup power supply for the whole system. The EMS controller communicates in real time with the multi-function meter at the front-end DSU1 and DSU2 inverter units of the DC bus to obtain the voltage, current, power and other data of the DC bus.

[0029] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. An energy storage container based on a diesel generator set used in a mining area, characterized in that: It includes energy storage device, power distribution container, diesel generator container and inverter container; the power distribution container is equipped with 600V 5000A AC bus, multiple switches and transformers; the inverter container is equipped with DC bus, multiple inverters and two DSUs; There are four main generators and one auxiliary generator in the diesel engine container. The four main generators couple their output ends to the AC bus 600V 5000A. A switch is set between each main generator and the AC bus. The output end of the auxiliary generator is connected to the power supply circuit through a switch, and the switch is connected to the transformer 600 / 400V through another switch. The transformer couples the power output of the auxiliary generator to the AC bus 600V 5000A. The AC bus 600V 5000A is connected to the diode power supply units DSU1 and DSU2 in the inverter container. DSU1 and DSU2 invert AC to DC and connect to the DC bus. They are connected to the inverter through the DC bus to supply power to the inverter. The energy storage device includes a step-up transformer, a PCS, a battery cluster, a BMS and an EMS controller. The PCS is connected to the step-up transformer, the EMS controller and the battery cluster respectively, and the BMS is connected to the battery cluster and the EMS controller respectively. The step-up transformer is connected to the 600V 5000A AC busbar of the distribution container through a switch. The battery cluster includes 12 battery modules connected in series and a high-voltage box connected to the battery modules. The battery modules connected in series are connected to the high-voltage box, and then the output end of the high-voltage box is connected to the busbar of the busbar cabinet, and then connected to the DC input side of the PCS through a circuit breaker. The high voltage box includes a DC circuit breaker, a DC / DC switching power supply, a fuse, a shunt, a battery control module BCU, a main positive contactor KM1, a main negative contactor KM2 and a pre-charge contactor KM3; the positive and negative poles of the battery cluster are connected to the positive and negative poles of the DC / DC switching power supply through a DC circuit breaker; the positive pole of the DC / DC switching power supply is connected to the fuse, and the fuse is respectively connected to the HV1+ port of the battery control module BCU and the main positive contactor KM1, and the fuse is also connected through a resistor R1 is connected to the pre-charging contactor KM3; the output ends of the main positive contactor KM1 and the pre-charging contactor KM3 are respectively connected to the HV2+ port of the battery control module BCU; the negative pole of the DC / DC switching power supply is respectively connected to the HV1- port of the battery control module BCU and the main negative contactor KM2, and the shunt is connected between the MT+ and MT- ports of the battery control module BCU. At the same time, the shunt is also connected to the circuit between the negative pole of the DC / DC switching power supply and the main negative contactor KM2.

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