Multi-station fusion micro-grid power distribution device applied to transformer substation

Abstract

The utility model discloses a power distribution device of a multi-station fusion micro-grid applied to a transformer station, which comprises a power supply part, a micro-grid power distribution device part and a multi-station fusion part, and is characterized in that the power supply part is connected with the multi-station fusion part through the micro-grid power distribution device part; according to the utility model, automatic switching can be realized when a single power supply of the power distribution device of the multi-station fusion micro-grid of the transformer substation fails, the wiring reliability is high, and the coordination among various energy sources and loads and the high energy utilization efficiency of the power distribution device of the multi-station fusion micro-grid of the transformer substation are high; the power distribution device of the multi-station fusion micro-grid of the transformer substation is suitable for 12 different working modes, the applicability is high, the power distribution device of the multi-station fusion micro-grid of the transformer substation is suitable for different multi-station fusion modes, and the generalizability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution in substations, and in particular to a power distribution device for a multi-station integrated microgrid applied to a substation. Background Art

[0002] Conventional substations are equipped with two station transformers, which are respectively drawn from the 10kV low-voltage busbars of different main transformers. The power supply system of multi-station integrated substations includes not only the power supply system of conventional substations, but also the power supply system of data center stations, photovoltaic power stations, energy storage power stations, charging stations and 5G base station power systems. "Multi-station integration" means that on the basis of traditional substations, one or several functions such as energy storage power stations, distributed photovoltaic power stations, charging stations, data center stations and communication base stations are integrated to form a multifunctional substation. "Multi-station integration" is an effective attempt to comprehensively utilize multiple energy sources under the background of "dual carbon" at this stage. There are various attempts at "multi-station" power system solutions, and they are also different.

[0003] At present, most multi-station integrated substations integrate energy storage power stations, distributed photovoltaic power stations, charging stations, data center stations and communication base stations into substations. The access methods of various energy stations are not unified and there are the following problems:

[0004] 1. When energy storage power stations, distributed photovoltaic power stations, charging stations, data center stations and communication base stations are connected at 0.4kV, the power consumption of the stations will be greatly affected, especially the data center stations with heavy loads;

[0005] 2. There is a lack of coordinated interaction between various energy sources and loads among energy storage power stations, distributed photovoltaic power stations, charging stations, data center stations and communication base stations, and the synergistic characteristics are not fully utilized, resulting in low energy utilization efficiency. For this reason, we propose a distribution device for a multi-station integrated microgrid applied to substations. Utility Model Content

[0006] The main purpose of the utility model is to provide a power distribution device for a multi-station integrated microgrid applied to a substation, which can effectively solve the problems in the background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A power distribution device for a multi-station fusion microgrid applied to a substation, comprising a power supply part, a microgrid power distribution device part and a multi-station fusion part, wherein the power supply part is connected to the multi-station fusion part through the microgrid power distribution device part;

[0009] The power supply part includes a 500kVA special transformer, and two groups of 500kVA special transformers are provided, and the 500kVA special transformers are respectively connected by the substation 10kVⅡM and 10kV external power supply;

[0010] The microgrid power distribution device includes a 0.4kV low-voltage withdrawable metal switch cabinet, an energy management system, a low-voltage intelligent switch A, an ATS switch and a low-voltage intelligent switch B. The low-voltage intelligent switch A includes 1QF1, 1QF2, 2QF1 and 2QF2, the ATS switch includes 1ATS and 2ATS, and the low-voltage intelligent switch B includes 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5, 1MQF6, 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6;

[0011] The multi-station fusion part includes a distributed photovoltaic system, an energy storage system, a charging pile and a data center. The charging pile includes charging pile 1 and charging pile 2. The energy storage system includes energy storage inverter 1, energy storage battery pack 1, energy storage inverter 2 and energy storage battery pack 2. The photovoltaic system includes photovoltaic inverter 1, photovoltaic air conditioner 1, photovoltaic module 1, photovoltaic inverter 2, photovoltaic module 2 and photovoltaic air conditioner 2. The data center includes data center 1, data center dual power switch 1, data center 2 and data center dual power switch 2.

[0012] Furthermore, the substation 10kVⅡM is electrically connected to 1ATS through 1QF1 and 1QF2; the 10kV external power supply is electrically connected to 2ATS through 2QF1 and 2QF2, and 2ATS and 1ATS are electrically connected to the energy management system.

[0013] Furthermore, the 1ATS is electrically connected to 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 via a 0.4kV IM busbar, and the 2ATS is electrically connected to 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 via a 0.4kV IIM busbar.

[0014] Furthermore, the other ends of the 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 away from the 0.4kV IM denominator are respectively electrically connected to the station variable load, photovoltaic inverter 1, energy storage converter 1, charging pile converter 1, data center dual power switch 1 and data center dual power switch 2; the photovoltaic inverter 1 is electrically connected to photovoltaic air conditioner 1 and photovoltaic component 1; the energy storage converter 1 is electrically connected to energy storage battery pack 1; and the charging pile converter 1 is electrically connected to charging pile 1.

[0015] Furthermore, the other ends of the 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 away from the 0.4kV IIM denominator are respectively electrically connected to a communication base station, a second photovoltaic inverter, a second energy storage converter, a second charging pile converter, a second data center dual power switch and a first data center dual power switch; the second photovoltaic inverter is electrically connected to a second photovoltaic air conditioner and a second photovoltaic module; the second energy storage converter is electrically connected to a second energy storage battery pack; and the second charging pile converter is electrically connected to a second charging pile.

[0016] Furthermore, the data center dual power switch 1 and the data center dual power switch 2 are electrically connected to the data center 1 and the data center 2 respectively.

[0017] Compared with the prior art, the microgrid power distribution device of the utility model has the following advantages:

[0018] (1) The power distribution device of the multi-station integrated microgrid of the substation can automatically switch when a single power supply fails, and the wiring reliability is high;

[0019] (2) The distribution devices of the multi-station integrated microgrid of the substation have high coordination among various energy sources and loads and high energy utilization efficiency;

[0020] (3) The distribution device of the multi-station integrated microgrid of the substation is applicable to 12 different working modes and has strong applicability;

[0021] (4) The distribution device of the multi-station integrated microgrid of the substation is suitable for different multi-station integration modes and has strong scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a schematic diagram of the overall structure of a power distribution device for a multi-station integrated microgrid applied to a substation. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figure 1 As shown, a power distribution device for a multi-station integrated microgrid applied to a substation includes a power supply part, a microgrid power distribution device part and a multi-station integrated part, wherein the power supply part is connected to the multi-station integrated part through the microgrid power distribution device part;

[0025] The power supply part includes a 500kVA special transformer, and two groups of 500kVA special transformers are provided, and the 500kVA special transformers are respectively connected by the substation 10kVⅡM and 10kV external power supply;

[0026] The microgrid power distribution device includes a 0.4kV low-voltage withdrawable metal switch cabinet, an energy management system, a low-voltage intelligent switch A, an ATS switch and a low-voltage intelligent switch B. The low-voltage intelligent switch A includes 1QF1, 1QF2, 2QF1 and 2QF2, the ATS switch includes 1ATS and 2ATS, and the low-voltage intelligent switch B includes 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5, 1MQF6, 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6;

[0027] The multi-station fusion part includes a distributed photovoltaic system, an energy storage system, a charging pile and a data center. The charging pile includes charging pile 1 and charging pile 2. The energy storage system includes energy storage inverter 1, energy storage battery pack 1, energy storage inverter 2 and energy storage battery pack 2. The photovoltaic system includes photovoltaic inverter 1, photovoltaic air conditioner 1, photovoltaic module 1, photovoltaic inverter 2, photovoltaic module 2 and photovoltaic air conditioner 2. The data center includes data center 1, data center dual power switch 1, data center 2 and data center dual power switch 2.

[0028] Among them, the substation 10kVⅡM is electrically connected to 1ATS through 1QF1 and 1QF2; the 10kV external power supply is electrically connected to 2ATS through 2QF1 and 2QF2, and 2ATS and 1ATS are electrically connected to the energy management system.

[0029] Among them, the 1ATS is electrically connected to 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 through a 0.4kV IM bus bar, and the 2ATS is electrically connected to 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 through a 0.4kV IIM bus bar.

[0030] Among them, the other ends of the 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 away from the 0.4kV IM denominator are respectively electrically connected to the station variable load, photovoltaic inverter 1, energy storage converter 1, charging pile converter 1, data center dual power switch 1 and data center dual power switch 2; the photovoltaic inverter 1 is electrically connected to photovoltaic air conditioner 1 and photovoltaic component 1; the energy storage converter 1 is electrically connected to energy storage battery pack 1; and the charging pile converter 1 is electrically connected to charging pile 1.

[0031] Among them, the other ends of the 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 away from the 0.4kV IIM denominator are respectively electrically connected to the communication base station, photovoltaic inverter 2, energy storage converter 2, charging pile converter 2, data center dual power switch 2 and data center dual power switch 1, the photovoltaic inverter 2 is electrically connected to photovoltaic air conditioner 2 and photovoltaic module 2, the energy storage converter 2 is electrically connected to energy storage battery pack 2, and the charging pile converter 2 is electrically connected to charging pile 2.

[0032] Among them, the data center dual power switch 1 and the data center dual power switch 2 are electrically connected to the data center 1 and the data center 2 respectively.

[0033] It should be noted that the utility model is a power distribution device for a multi-station integrated microgrid applied to a substation. The multi-station integrated power supply system of the utility model consists of three parts: a power supply part, a microgrid distribution device part, and a multi-station integrated part. The power supply part consists of two 500kVA special transformers, and the two transformers are respectively connected by the 10kVⅡM section bus feeder of the substation and a 10kV external power supply;

[0034] The microgrid distribution device adopts 0.4kV low-voltage withdrawable metal switchgear, including energy management system, low-voltage intelligent switch (1QF1, 1QF2, 2QF1, 2QF2), ATS switch (1ATS, 2ATS) and low-voltage intelligent switch (1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5, 1MQF6, 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6). The access interval of each switch is as follows: Figure 1 The wiring is done by the wiring schematic diagram shown in the figure. The utility model only makes a simple connection statement in the claims part. The detailed connection lines are as follows. Figure 1 Wiring method is the main one;

[0035] The multi-station integration part consists of a distributed photovoltaic system, energy storage system, charging piles and data center. This new model uses two 240kW charging piles, two sets of 0.5MW / 1MWh devices, and the photovoltaic system uses 115kW and 120kW photovoltaic modules;

[0036] The working principle of the microgrid distribution device is described as follows:

[0037] (1) Normal working mode: The 0.4kV IM and 0.4kV IIM busbars of the microgrid distribution device are operated, that is, switches 1QF1 and 2QF2 are closed, switches 2QF1 and 1QF2 are disconnected, and 1ATS and 1ATS are operating normally. In this mode, the energy storage adopts a timed charging and discharging mode, with 2 charges and 2 discharges per day. The charging and discharging time is determined according to the peak and valley periods of the load. The microgrid distribution device includes the following working modes;

[0038] ① Photovoltaic power generation and energy storage charging mode: During the daytime photovoltaic power generation and energy storage charging period, the energy management system control strategy is: photovoltaic power generation gives priority to powering the data center. If there is a surplus of photovoltaic power generation for the data center, charging piles and other loads, the surplus is used to charge the energy storage; when photovoltaic power generation is not enough to power the data center, charging piles and other loads, the loads are powered by the mains;

[0039] ② Photovoltaic power generation, energy storage discharge mode: During photovoltaic power generation and energy storage discharge during the day, the energy management system control strategy is: energy storage discharge and photovoltaic power generation give priority to data centers, charging piles and other loads, and all excess photovoltaic power generation is connected to the grid;

[0040] ③ Photovoltaic not generating electricity, energy storage charging mode: At night or other times when photovoltaic is not generating electricity and during energy storage charging, the energy management system control strategy is: data center and other loads are powered by the mains;

[0041] ④ Photovoltaic not generating electricity, energy storage discharge mode: At night or other times when photovoltaic is not generating electricity and during energy storage discharge, the energy management system control strategy is: energy storage discharge gives priority to powering the data center and other loads;

[0042] (2) Off-grid operation mode: The microgrid distribution device operates off-grid, that is, 1QF1, 1QF2, 2QF1 and 2QF2 are disconnected, 1ATS and 2ATS are shut down, and the microgrid distribution device operates independently. In this mode, the energy storage switches to the off-grid mode, and the timed charge and discharge mode is not adopted. The microgrid distribution device includes the following operating modes;

[0043] ⑤ Photovoltaic power generation, energy storage charging mode: When the light is good and the data center load, charging pile load and other loads are small, the photovoltaic power generation power is greater than the data center, charging pile and station load. The energy management system control strategy is: photovoltaic power generation gives priority to powering the data center, and the excess photovoltaic power is used to charge the energy storage;

[0044] ⑥ Photovoltaic power generation, energy storage discharge mode: When the light is normal and the data center load, charging pile load and other loads are large, the photovoltaic power generation power is less than the load in the station. The energy management system control strategy is: give priority to powering the data center, and the data center is powered by photovoltaic power generation and energy storage at the same time;

[0045] ⑦ Photovoltaic no power generation, energy storage charging mode: In off-grid mode, this working mode is prohibited;

[0046] ⑧ Photovoltaic not generating electricity, energy storage discharge mode: When photovoltaic cannot generate electricity, the energy management system control strategy is: energy storage supplies power to the data center;

[0047] (3) Power failure working mode: The microgrid distribution device operates with a single power supply, that is, 1QF 1 and 1QF2 are closed, 2QF 1 and 2QF2 are disconnected, 1ATS is in operation, 2ATS is out of operation, or 1QF 1 and 1QF2 are disconnected, 2QF1 and 2QF2 are closed, 1ATS is out of operation, and 2ATS is in operation. In this mode, the energy storage adopts a timed charging and discharging mode, with 2 charges and 2 discharges per day. The charging and discharging time is determined according to the peak and valley periods of the load. The working mode of the energy management system of the microgrid distribution device is consistent with the normal working mode.

[0048] It should be noted that the utility model is a distribution device for a multi-station integrated microgrid applied to a substation. The components in the utility model are all components known to technical personnel in the field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0049] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A power distribution device for a multi-station integrated microgrid applied to a substation, characterized in that: It includes a power supply part, a microgrid power distribution device part and a multi-station fusion part, wherein the power supply part is connected to the multi-station fusion part through the microgrid power distribution device part; The power supply part includes a 500kVA special transformer, and two groups of 500kVA special transformers are provided, and the 500kVA special transformers are respectively connected by the substation 10kVⅡM and 10kV external power supply; The microgrid power distribution device includes a 0.4kV low-voltage withdrawable metal switch cabinet, an energy management system, a low-voltage intelligent switch A, an ATS switch and a low-voltage intelligent switch B. The low-voltage intelligent switch A includes 1QF1, 1QF2, 2QF1 and 2QF2, the ATS switch includes 1ATS and 2ATS, and the low-voltage intelligent switch B includes 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5, 1MQF6, 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6; The multi-station fusion part includes a distributed photovoltaic system, an energy storage system, a charging pile and a data center. The charging pile includes charging pile 1 and charging pile 2. The energy storage system includes energy storage inverter 1, energy storage battery pack 1, energy storage inverter 2 and energy storage battery pack 2. The photovoltaic system includes photovoltaic inverter 1, photovoltaic air conditioner 1, photovoltaic module 1, photovoltaic inverter 2, photovoltaic module 2 and photovoltaic air conditioner 2. The data center includes data center 1, data center dual power switch 1, data center 2 and data center dual power switch 2.

2. A power distribution device for a multi-station integrated microgrid applied to a substation according to claim 1, characterized in that: The substation 10kVⅡM is electrically connected to 1ATS through 1QF1 and 1QF2; the 10kV external power supply is electrically connected to 2ATS through 2QF1 and 2QF2, and 2ATS and 1ATS are electrically connected to the energy management system.

3. A power distribution device for a multi-station integrated microgrid applied to a substation according to claim 2, characterized in that: The 1ATS is electrically connected to 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 via a 0.4kVIM denominator line, and the 2ATS is electrically connected to 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 via a 0.4kVIIM denominator line.

4. A power distribution device for a multi-station integrated microgrid applied to a substation according to claim 3, characterized in that: The other ends of the 1MQF1, 1MQF2, 1MQF3, 1MQF4, 1MQF5 and 1MQF6 away from the 0.4kVIM denominator are respectively electrically connected to the station variable load, photovoltaic inverter 1, energy storage converter 1, charging pile converter 1, data center dual power switch 1 and data center dual power switch 2; the photovoltaic inverter 1 is electrically connected to a photovoltaic air conditioner 1 and a photovoltaic component 1; the energy storage converter 1 is electrically connected to an energy storage battery pack 1; and the charging pile converter 1 is electrically connected to a charging pile 1.

5. The power distribution device of a multi-station integrated microgrid applied to a substation according to claim 3, characterized in that: The other ends of the 2MQF1, 2MQF2, 2MQF3, 2MQF4, 2MQF5 and 2MQF6 away from the 0.4kVIIM denominator line are electrically connected to the communication base station, photovoltaic inverter 2, energy storage converter 2, charging pile converter 2, data center dual power switch 2 and data center dual power switch 1 respectively; the photovoltaic inverter 2 is electrically connected to photovoltaic air conditioner 2 and photovoltaic module 2; the energy storage converter 2 is electrically connected to energy storage battery pack 2; and the charging pile converter 2 is electrically connected to charging pile 2.

6. A power distribution device for a multi-station integrated microgrid applied to a substation according to claim 4, characterized in that: The data center dual power switch 1 and the data center dual power switch 2 are electrically connected to the data center 1 and the data center 2 respectively.

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