CN211958785U

CN211958785U - Energy management device of alternating current-direct current hybrid micro-grid

Info

Publication number: CN211958785U
Application number: CN202020645452.6U
Authority: CN
Inventors: 陈小勇; 朱云山; 肖峰; 俞晓荣; 魏晓祥; 邹斌; 李季; 李进
Original assignee: Nanjing Guochen Direct Current Distribution Technology Co ltd; Jiangsu Antai Power Transmission And Transformation Engineering Co ltd
Current assignee: Nanjing Guochen Direct Current Distribution Technology Co ltd; Jiangsu Antai Power Transmission And Transformation Engineering Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-11-17
Anticipated expiration: 2030-04-24

Abstract

The utility model discloses an energy management device of an AC/DC hybrid micro-grid, which comprises an analog input interface, an input detection interface, an output interface and a communication interface, and also comprises a DC voltage sensor and a DC current sensor which are positioned outside; the direct-current voltage sensor is arranged on a direct-current bus, and direct-current sensors are arranged on a connecting circuit of commercial alternating current and the direct-current bus, a connecting circuit of new energy power generation equipment and the direct-current bus, a connecting circuit of the energy storage unit and the direct-current bus and a connecting circuit of the direct-current bus and a direct-current load; the direct current voltage sensor and the direct current sensor are respectively connected with the analog input interface through cables; the opening detection interface is connected with a switch contact of corresponding equipment through a cable; the outlet interface is connected with a switch of the corresponding equipment through a cable; the communication interface is connected with the new energy power generation equipment, the energy storage unit, the DC/DC transformer and the AC/DC converter through data lines, and is also connected with the remote monitoring system through a cable.

Description

Energy management device of alternating current-direct current hybrid micro-grid

Technical Field

The utility model relates to an energy management device of mixed little electric wire netting of alternating current-direct current belongs to power equipment technical field.

Background

The AC/DC hybrid micro-grid mainly comprises four major elements, namely a source (new energy such as photovoltaic, wind power and the like), a grid (an AC power grid), a load (a DC load) and a storage (energy storage). Each element corresponds to one device when in normal operation, how to organically coordinate different devices, and how to efficiently utilize new energy and stored energy to realize economic maximization, there is no perfect solution at present. In the prior art, a battery management system is used for charging and discharging the battery according to time intervals to realize certain economic benefit, but the mode cannot be adjusted in real time according to load change.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that an energy management device of mixed little electric wire netting of alternating current-direct current is provided, the device can still have the remote communication interface according to the energy flow in the power grid is adjusted in real time to the supply and demand relation of load and new forms of energy in addition, but the operation operating mode of the mixed little electric wire netting system of remote monitoring alternating current-direct current.

For solving the technical problem, the utility model discloses the technical scheme who adopts does:

an energy management device of an alternating current-direct current hybrid microgrid comprises an analog input interface, an input detection interface, an output interface, a communication interface, a direct current voltage sensor and a direct current sensor, wherein the direct current voltage sensor and the direct current sensor are positioned outside; the direct-current voltage sensor is arranged on a direct-current bus, and direct-current sensors are arranged on a connecting circuit of commercial alternating current and the direct-current bus, a connecting circuit of new energy power generation equipment and the direct-current bus, a connecting circuit of the energy storage unit and the direct-current bus and a connecting circuit of the direct-current bus and a direct-current load; the direct current voltage sensor and the direct current sensor are respectively connected with the analog input interface through cables; the opening detection interface is connected with a switch contact of corresponding equipment through a cable; the outlet interface is connected with a switch of the corresponding equipment through a cable; the communication interface is connected with the new energy power generation equipment, the energy storage unit, the DC/DC transformer and the AC/DC converter through data lines, and is also connected with the remote monitoring system through a cable.

Wherein, still include central processing chip, the model of chip is: STM32F 4; the analog quantity signal input by the analog quantity input interface is transmitted to the central processing chip after A/D conversion.

The secondary signals sampled by the direct current voltage sensor and the direct current sensor are connected with the analog input interface, the voltage values corresponding to the secondary signals sampled by the voltage sensor and the direct current sensor are 0-5V, and the current values are 4-20 mA.

The signal output by the central processing chip is isolated by the optical coupler and then output to corresponding equipment through the outgoing interface, and the signal input by the incoming detection interface is isolated by the optical coupler and then transmitted to the central processing chip. On one hand, the optical coupler plays a role in isolating signals, and because the optical coupler is in unidirectional transmission, unidirectional transmission of the signals can be realized, so that the input end and the output end are completely electrically isolated, the output signals have no influence on the input end, the anti-interference capability is strong, and the work is stable; the optical coupler is photoelectric, so that the service life is long, and the defect that a mechanical contact has actuation times is overcome; secondly still play the level conversion effect, the opto-coupler can realize the conversion effect of level, and for example the singlechip is 3.3V power supply, when needing to output the square wave of 5V amplitude, can play the conversion effect of level through the opto-coupler.

Has the advantages that: the utility model discloses an analog quantity acquisition interface can obtain the supply and demand relation of load and new forms of energy, corresponds the operation of equipment through the communication interface break-make to improve the cooperative work ability between various different equipment in the direct current little electric wire netting, promote the utilization ratio of the new forms of energy greatly.

Drawings

Fig. 1 is a topological diagram of an ac/dc hybrid micro-grid system according to the present invention;

fig. 2 is a schematic circuit diagram of the energy management device of the present invention.

Detailed Description

The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is only for illustrating the present invention and should not be taken as limiting the invention as detailed in the claims.

As shown in fig. 1-2, the ac/dc hybrid microgrid energy management device of the present invention includes an analog input interface, an input detection interface, an output interface, a communication interface, a dc voltage sensor and a dc current sensor located outside; the direct-current voltage sensor is arranged on a direct-current bus, and direct-current sensors are arranged on a connecting circuit of commercial alternating current and the direct-current bus, a connecting circuit of new energy power generation equipment and the direct-current bus, a connecting circuit of the energy storage unit and the direct-current bus and a connecting circuit of the direct-current bus and a direct-current load; the direct current voltage sensor and the direct current sensor are respectively connected with the analog input interface through cables; the opening detection interface is connected with a switch contact of corresponding equipment (the corresponding equipment comprises new energy power generation equipment, an energy storage unit, a DC/DC transformer, an AC/DC converter and a load) through a cable, and the opening detection interface detects the running state of the equipment in the system; the outgoing interface is connected with a switch of corresponding equipment (the corresponding equipment comprises new energy power generation equipment, an energy storage unit, a DC/DC transformer, an AC/DC converter and a load) through a cable, and the outgoing interface drives the equipment in the system to run on and off through the on-off operation of the switch; the communication interface is connected with the new energy power generation equipment, the energy storage unit, the DC/DC transformer and the AC/DC converter through data lines, and is also connected with the remote monitoring system through a cable. On one hand, the communication interface is connected with equipment running in the system and is connected with a remote monitoring system to realize real-time data uploading. The communication interface collects the operation parameters of each device in the system, and simultaneously can set the operation parameters (current and voltage) of the device and the operation state (operation and exit) of the device through the communication interface.

The utility model discloses little electric wire netting energy management device of alternating current-direct current mixture still includes central processing chip, and the model of chip is: STM32F 4; the analog quantity signal input by the analog quantity input interface is transmitted to the central processing chip after A/D conversion. The secondary signals sampled by the direct current voltage sensor and the direct current sensor are connected with the analog input interface, the voltage values corresponding to the secondary signals sampled by the voltage sensor and the direct current sensor are 0-5V, and the current values are 4-20 mA.

The energy management device realizes energy allocation of the direct-current microgrid system in an analog quantity acquisition and communication mode, and specifically comprises the following steps: when the generated energy of the new energy is detected to be larger than the electricity consumption of the load, the stored energy is charged; when the generated energy of the new energy is detected to be smaller than the electricity consumption of the load, the stored energy is discharged; when the generated energy and the stored energy discharge amount of the new energy are detected to be smaller than the load, the AC power grid provides the shortage electric quantity; and when the generated energy of the new energy is detected to be larger than the load plus the energy storage charging electric quantity, the residual electric quantity is connected to the grid for power generation.

The energy management device can rapidly detect the generated energy of the new energy and the power consumption of the load in real time through analog quantity acquisition, and drives (operates and quits) the equipment operation mode through a communication mode so as to achieve the economic benefit of maximum local consumption of the new energy.

Claims

1. The utility model provides an energy management device of alternating current-direct current hybrid microgrid which characterized in that: the device comprises an analog input interface, an input detection interface, an output interface, a communication interface, a direct current voltage sensor and a direct current sensor, wherein the direct current voltage sensor and the direct current sensor are positioned outside; the direct-current voltage sensor is arranged on a direct-current bus, and direct-current sensors are arranged on a connecting circuit of commercial alternating current and the direct-current bus, a connecting circuit of new energy power generation equipment and the direct-current bus, a connecting circuit of the energy storage unit and the direct-current bus and a connecting circuit of the direct-current bus and a direct-current load; the direct current voltage sensor and the direct current sensor are respectively connected with the analog input interface through cables; the opening detection interface is connected with a switch contact of corresponding equipment through a cable; the outlet interface is connected with a switch of the corresponding equipment through a cable; the communication interface is connected with the new energy power generation equipment, the energy storage unit, the DC/DC transformer and the AC/DC converter through data lines, and is also connected with the remote monitoring system through a cable.

2. The energy management device of the ac/dc hybrid microgrid of claim 1, characterized in that: still include central processing chip, the model of chip is: STM32F 4; the analog quantity signal input by the analog quantity input interface is transmitted to the central processing chip after A/D conversion.

3. The energy management device of the ac/dc hybrid microgrid of claim 1, characterized in that: the secondary signals sampled by the direct current voltage sensor and the direct current sensor are connected with the analog input interface, the voltage values corresponding to the secondary signals sampled by the voltage sensor and the direct current sensor are 0-5V, and the current values are 4-20 mA.

4. The energy management device of the ac/dc hybrid microgrid of claim 2, characterized in that: the signal that central processing chip output passes through the opto-coupler after keeping apart and exports for corresponding equipment through opening out the interface, opens into the signal that detects the interface input and transmits for central processing chip after keeping apart through the opto-coupler.