CN-122026468-A - Semi-off-grid micro-grid comprehensive energy system

CN122026468ACN 122026468 ACN122026468 ACN 122026468ACN-122026468-A

Abstract

The application discloses a semi-off-grid micro-grid comprehensive energy system, which relates to the field of oilfield load power supply, and comprises the following components: the power grid interface is connected with the power grid, the power supply equipment is connected with the power supply equipment and loads of oil field load scenes, the new energy equipment is connected with the rectification module, the power grid interface is connected with the power grid, the rectification module is disconnected with the power grid interface and connected with the power supply equipment when the power grid breaks down, the power supply equipment is used for sending a first alternating current signal to the rectification module, and the rectification module receives the first alternating current signal output by the power supply equipment and rectifies the first alternating current signal into a direct current bus signal when the power grid breaks down or the power generated by the new energy equipment does not meet the rated load operation power, and sends the direct current bus signal to the loads to provide stable power for the loads. Compared with the prior art, the application reduces the conversion links, reduces the loss and improves the utilization rate of electric energy by establishing the AC/DC coupling micro-grid.

Inventors

JIANG ZONGNAN
GUO LIDONG
YU HAI
CHEN YUSHENG
YANG LONGFEI
TANG YIN
LI XIANJUN

Assignees

中石油深圳新能源研究院有限公司
中国石油天然气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241105

Claims (9)

1. The semi-off-grid micro-grid comprehensive energy system is characterized by being applied to an oilfield scene and comprising a grid interface, power supply equipment, a rectifying module and new energy equipment; the rectification module is respectively connected with the power grid interface, the power supply equipment and the load of the oilfield load scene, the new energy equipment is connected with the rectification module, and the power grid interface is connected with a power grid; The rectification module is used for disconnecting the connection with the power grid interface and connecting with the power supply equipment when the power grid fails; The power supply equipment is used for sending a first alternating current signal to the rectification module through an alternating current bus; The rectification module is further configured to receive a first ac signal output by the power supply device when the power grid fails or the generated power of the new energy device does not meet the rated power of the load operation, rectify the first ac signal into a dc bus signal, and send the dc bus signal to the load, so as to provide stable power supply for the load.
2. The semi-off-grid micro-grid integrated energy system of claim 1, wherein the new energy device comprises a photovoltaic panel and a first boost unit; The photovoltaic cell panel is connected with the load after being boosted by the first boosting unit; the photovoltaic cell panel is used for converting the optical signal into a first electric signal and sending the first electric signal to the first boosting unit when the optical signal is received; the first boosting unit is used for boosting the first electric signal into a direct current bus signal and sending the direct current bus signal to the load when the first electric signal is received.
3. The semi-off-grid micro-grid integrated energy system of claim 2, wherein the new energy device further comprises a wind generator and a first rectifying unit; The wind driven generator is connected with the load after being rectified by the first rectifying unit; The wind driven generator is used for converting a wind signal into a second electric signal and sending the second electric signal to the first rectifying unit when receiving the wind signal; The first rectifying unit is used for rectifying the second electric signal into a direct current bus signal and sending the direct current bus signal to the load when the second electric signal is received.
4. The semi-off-grid micro grid integrated energy system of claim 3, wherein the new energy device further comprises a storage battery; The storage battery is connected with the load through a direct current bus; The storage battery is used for charging when receiving a direct current bus signal when the power generation power of the photovoltaic cell panel and the wind driven generator meets the rated power of the load operation; And the storage battery is also used for sending a third electric signal to the load for power supply through the direct current bus when the power generated by the photovoltaic panel and the wind driven generator does not meet the rated power of the load operation.
5. The semi-off-grid micro-grid integrated energy system of claim 1, wherein the power supply device comprises a gas turbine and a long-term energy storage module; the rectification module is respectively connected with the gas turbine and the long-time energy storage module; The gas turbine is used for converting chemical energy into electric energy when a power grid fails or the generated power of the new energy equipment does not meet the rated power of the load operation, outputting a first alternating current signal corresponding to the electric energy and sending the first alternating current signal to the rectification module; and the long-time energy storage module is used for sending a first alternating current signal to the rectification module when the power grid fails or the generated power of the new energy equipment does not meet the rated power of the load operation.
6. The semi-off-grid micro-grid integrated energy system of claim 1, wherein the rectification module comprises a first voltage reduction unit and a second rectification unit; the first voltage reduction unit is respectively connected with the power supply equipment, the power grid interface and the second rectifying unit; the first voltage reducing unit is used for reducing the first alternating current signal into a second alternating current signal and sending the second alternating current signal to the second rectifying unit when the first alternating current signal is received; The second rectifying unit is used for rectifying the second alternating current signal into a direct current bus signal and sending the direct current bus signal to the load when receiving the second alternating current signal.
7. The semi-off-grid micro-grid integrated energy system of claim 1, further comprising a second boost unit, a first inverter unit, and a second inverter unit; The second boosting unit, the first inversion unit and the second inversion unit are respectively connected with the rectification module, the new energy equipment and the load; the second boosting unit is used for boosting the direct-current bus signal into a first direct-current signal and sending the first direct-current signal to the load when receiving the direct-current bus signal; The first inversion unit is used for inverting the direct-current bus signal into a third alternating-current signal and sending the third alternating-current signal to the load when receiving the direct-current bus signal; And the second inversion unit is used for inverting the direct-current bus signal into a fourth alternating-current signal and sending the fourth alternating-current signal to the load when receiving the direct-current bus signal.
8. The semi-off-grid micro grid integrated energy system of claim 1, wherein the new energy device is configured to provide additional power to the load by renewable energy technology generation when the grid is powering the load.
9. The semi-off-grid micro-grid integrated energy system of claim 1, wherein the grid interface is configured to send a fifth ac signal to the rectification module via the ac bus when receiving the fifth ac signal of the grid; And the rectification module is also used for rectifying the fifth alternating current signal into a direct current bus signal and sending the direct current bus signal to the load through the direct current bus when receiving the fifth alternating current signal, so as to provide stable power supply for the load.

Description

Semi-off-grid micro-grid comprehensive energy system Technical Field The application relates to the technical field of oilfield load power supply, in particular to a semi-off-grid micro-grid comprehensive energy system. Background The AC/DC hybrid micro-grid can fully utilize the advantages of AC power supply and DC power supply, can reasonably distribute AC/DC distributed power supply and load, reduce intermediate conversion links (DC/AC or AC/DC) as much as possible, and improve the efficiency of the micro-grid system. The two heterogeneous subnets of alternating current and direct current are connected together through an interconnection converter, so that the mutual conversion and support of alternating current and direct current are realized. The whole AC/DC hybrid micro-grid is connected with a large power grid through PCC points (Point of Common Connection, public connection points) at the side of an AC sub-network. When the large power grid fails or the hybrid micro-grid plans to island, the PCC points are disconnected, the hybrid micro-grid breaks away from the large power grid, and the island mode is entered. At present, no comprehensive energy system design aiming at an alternating current-direct current coupling semi-off-grid micro-grid of an oil field scene exists in the research, so that the electric energy utilization rate of an oil field production base with various types of direct current power supplies and loads is low, the electric energy loss caused by multiple transformation ring segments is large, the equipment investment and the operation cost are high, and the oil field micro-grid cannot provide stable support under the fault state of an alternating current large grid of an edge weak grid scene. Disclosure of Invention The application mainly aims to provide a semi-off-grid micro-grid comprehensive energy system, which aims to solve the technical problem that an oilfield micro-grid cannot provide stable support because the electric energy utilization rate of oilfield production bases of various types of direct current power supplies and loads is low. In order to achieve the above purpose, the application provides a semi-off-grid micro-grid integrated energy system, which is applied to an oilfield scene and comprises a grid interface, power supply equipment, a rectifying module and new energy equipment; the rectification module is respectively connected with the power grid interface, the power supply equipment and the load of the oilfield load scene, the new energy equipment is connected with the rectification module, and the power grid interface is connected with a power grid; The rectification module is used for disconnecting the connection with the power grid interface and connecting with the power supply equipment when the power grid fails; The power supply equipment is used for sending a first alternating current signal to the rectification module through an alternating current bus; The rectification module is further configured to receive a first ac signal output by the power supply device when the power grid fails or the generated power of the new energy device does not meet the rated power of the load operation, rectify the first ac signal into a dc bus signal, and send the dc bus signal to the load, so as to provide stable power supply for the load. Optionally, the new energy device comprises a photovoltaic panel and a first boosting unit; The photovoltaic cell panel is connected with the load after being boosted by the first boosting unit; the photovoltaic cell panel is used for converting the optical signal into a first electric signal and sending the first electric signal to the first boosting unit when the optical signal is received; the first boosting unit is used for boosting the first electric signal into a direct current bus signal and sending the direct current bus signal to the load when the first electric signal is received. Optionally, the new energy device further comprises a wind driven generator and a first rectifying unit; The wind driven generator is connected with the load after being rectified by the first rectifying unit; The wind driven generator is used for converting a wind signal into a second electric signal and sending the second electric signal to the first rectifying unit when receiving the wind signal; The first rectifying unit is used for rectifying the second electric signal into a direct current bus signal and sending the direct current bus signal to the load when the second electric signal is received. Optionally, the new energy device further comprises a storage battery; The storage battery is connected with the load through the direct current bus; The storage battery is used for charging when receiving a direct current bus signal when the power generation power of the photovoltaic cell panel and the wind driven generator meets the rated power of the load operation; And the storage battery is also used for sending a third electric signal to th