Distributed energy storage power station control system

Abstract

The utility model discloses a distributed energy storage power station control system, which relates to the technical field of distributed energy storage power station control and comprises a data acquisition module, a data preprocessing module, a control module and a distributed energy storage system, by integrating the advanced information communication technology, the real-time monitoring and remote control of the state of the distributed energy storage power station are realized, and the operation efficiency is greatly improved; by constructing the distributed energy storage system, power can be supplied through the distributed energy storage system when the in-station power supply and the out-of-station power supply are not reliable, and the deployment flexibility and the power utilization safety and reliability of the alternating-current power supply system for the transformer substation applying distributed energy storage are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to distributed energy storage power station control technical field especially relates to a kind of distributed energy storage power station control system. BACKGROUND

[0002] According to access mode and application scene, the application of energy storage system mainly includes two forms of centralized and distributed, the energy storage system of centralized application is generally accessed in the same grid point, and the present, in large-scale renewable energy power generation grid connection, power grid auxiliary service etc. mainly adopt this form, with power (several megawatts to hundred megawatt level), long (minute level to hour level) etc. characteristics, the energy storage system of distributed application accesses position flexibly, and currently, in medium and low voltage distribution network, distributed power generation and microgrid, user side application, the power, capacity of distributed energy storage are relatively small.

[0003] There are still some problems in the current distributed energy storage system, compared with the traditional operation mode of large power grid, distributed energy storage access and output have the characteristics of scattered layout and poor controllability. From the perspective of power grid dispatching, there is a lack of effective dispatching means, which is not conducive to the improvement of distributed energy storage on power grid frequency, voltage and power quality, and can cause great waste of energy storage resources. Therefore, our company develops a kind of distributed energy storage power station control software to solve the problems of prior art. UTILITY MODEL CONTENT

[0004] The utility model aims at the defects and deficiencies of prior art, and provides a kind of distributed energy storage power station control system, effectively improves the controllability of distributed energy storage.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of distributed energy storage power station control system, including the data acquisition module for the data acquisition of each distributed energy storage power station, still including data preprocessing module, control module, distributed energy storage system;The data acquisition module is connected control module by data preprocessing module;The control module is connected with distributed energy storage system;

[0007] The data acquisition module includes alternating voltage data acquisition unit, switching value acquisition unit;The data preprocessing module includes multiplexing switch, sensor signal conditioning circuit, voltage signal conditioning circuit, voltage division follow-up filter circuit, analog-digital conversion module;The control module includes microcontroller module, wireless transmission module, data storage module, clock module, crystal oscillator module, alarm module, man-machine interface module, display module, interface module and power module;

[0008] The AC voltage data acquisition unit and the switching value acquisition unit are connected with the microcontroller module through multiplexing switch, sensor signal conditioning circuit, voltage signal conditioning circuit, voltage division follow-up filter circuit and analog-digital conversion module in sequence.

[0009] As a further preferred scheme of the utility model a kind of distributed energy storage power station control system, the distributed energy storage system includes energy storage battery unit, AC / DC inversion unit, isolation transformer and AC incoming line unit, the energy storage battery unit is sequentially connected AC incoming line unit through AC / DC inversion unit, isolation transformer.

[0010] As a further preferred scheme of the utility model a kind of distributed energy storage power station control system, the sensor signal conditioning circuit includes analog signal input end, resistance R1, resistance R2, capacitor C1, operational amplifier U1, analog signal income end is connected with the one end of resistance R1, the one end of resistance R2 respectively, the other end of resistance R2 is connected with the one end of capacitor C1, the other end of capacitor C1 is connected with the other end of resistance R1 and the positive input end of operational amplifier U1 respectively, the negative input end of operational amplifier U1 is connected with the output end of operational amplifier U1.

[0011] As a further preferred scheme of the utility model a kind of distributed energy storage power station control system, the voltage signal conditioning circuit includes voltage signal input end, resistance R3, resistance R4, resistance R5, capacitor C2, operational amplifier U2, voltage signal input end is connected with the one end of resistance R3, the other end of resistance R3 is connected with the one end of resistance R4 and the one end of resistance R5 respectively, the other end of resistance R5 is connected with the one end of capacitor C2, the other end of capacitor C2 is connected with the other end of resistance R4 and the positive input end of operational amplifier U1 respectively, the negative input end of operational amplifier U2 is connected with the output end of operational amplifier U2.

[0012] As a further preferred scheme of the utility model a kind of distributed energy storage power station control system, the voltage division follow-up filter circuit includes operational amplifier U3, resistance R11, resistance R12, operational amplifier U4, resistance R13, capacitor C7, the output end of operational amplifier U3 is connected with the one end of resistance R12, the other end of resistance R12 is connected with the one end of resistance R11 and the positive input end of operational amplifier U4 respectively, the output end of operational amplifier U4 is connected with the one end of resistance R13, the other end of resistance R13 is connected with the one end of capacitor C7 and A / D conversion unit respectively, the other end of capacitor C7 is grounded, the other end of resistance R11 is connected with current signal conditioning circuit.

[0013] As a further preferred scheme of the utility model a kind of distributed energy storage power station control system, the clock module includes clock chip DS3231, capacitor C4, resistance R25, resistance R26, resistance R27, resistance R28, VCC end is connected with the one end of resistance R25 and the one end of resistance R26 respectively, the other end of resistance R25 is connected with the SDA end of clock chip DS3231, the other end of resistance R26 is connected with the SCL end of clock chip DS3231, VDD end is connected with the one end of resistance R27, the one end of resistance R28, the one end of capacitor C4 and the 2 port of clock chip DS3231 respectively, the other end of resistance R27 is connected with the 1 port of clock chip DS3231, the other end of resistance R28 is connected with the 3 port of clock chip DS3231, the other end of capacitor C4 is grounded.

[0014] Compared with prior art, the utility model has the following technical effects:

[0015] The utility model discloses a kind of distributed energy storage power station control systems, including the data acquisition module for the data acquisition of each distributed energy storage power station, also include data preprocessing module, control module, distributed energy storage system;The data acquisition module is connected control module by data preprocessing module;The control module is connected with distributed energy storage system;By integrating advanced information communication technology, the real-time monitoring and remote control to the state of distributed energy storage power station are realized, and operation efficiency is greatly improved;By constructing distributed energy storage system, it can be realized when station-in power supply and station-out power supply are unreliable, power supply is carried out by distributed energy storage system, and the deployment flexibility and power safety reliability of the alternating current power supply system of substation used in application distributed energy storage are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the utility model, and constitute part of the present application, but do not constitute improper limitation to the utility model, and in the drawings:

[0017] Figure 1 It is the overall structure principle diagram of the utility model a kind of distributed energy storage power station control system;

[0018] Figure 2 It is the module principle diagram of the utility model a kind of distributed energy storage power station control system;

[0019] Figure 3 It is the principle diagram of the circuit diagram of the utility model distributed energy storage system;

[0020] Figure 4 It is the circuit diagram of the utility model sensor signal conditioning circuit;

[0021] Figure 5 It is the circuit diagram of the utility model voltage signal conditioning circuit;

[0022] Figure 6 is the voltage division follow filter circuit of the utility model;

[0023] Figure 7 is the circuit diagram of the clock module of the utility model. DETAILED DESCRIPTION

[0024] The utility model will be described in detail below in combination with the drawings and specific embodiments, and the schematic embodiments and the description are only used to explain the utility model, but not as the limitation of the utility model.

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, but not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of the utility model protection:

[0026] A kind of distributed energy storage power station control system, as shown in Figure 1 It contains data acquisition module for each data acquisition of distributed energy storage power station, also contains data preprocessing module, control module, distributed energy storage system;The data acquisition module is connected control module by data preprocessing module;The control module is connected with distributed energy storage system;

[0027] As shown in Figure 2 The data acquisition module contains alternating voltage data acquisition unit, switch quantity acquisition unit;

[0028] The data preprocessing module contains multiplexing switch, sensor signal conditioning circuit, voltage signal conditioning circuit, voltage division follow filter circuit, analog-digital conversion module;

[0029] The control module contains microcontroller module, wireless transmission module, data storage module, clock module, crystal oscillator module, alarm module, man-machine interface module, display module, interface module and power module;

[0030] Alternating voltage data acquisition unit, switch quantity acquisition unit are connected microcontroller module in turn through multiplexing switch, sensor signal conditioning circuit, voltage signal conditioning circuit, voltage division follow filter circuit, analog-digital conversion module respectively, and the distributed energy storage system, wireless transmission module, data storage module, clock module, crystal oscillator module, alarm module, man-machine interface module, display module, interface module and power module are connected with microcontroller module respectively.

[0031] The utility model discloses a plurality of sensor signals, voltage signal is gathered, and the signal of gathering is handled successively through signal conditioning, analog switch, voltage division follow and anti aliasing filter, and the establishment time of link is analyzed, and then adopts successive approximation type AD chip conversion, and the signal precision of gathering is higher, and it is more stable and reliable.

[0032] As Figure 3 The distributed energy storage system comprises energy storage battery units, AC / DC inversion units, isolation transformers and AC incoming line units, and the energy storage battery units are connected to the AC incoming line units through the AC / DC inversion units and the isolation transformers in sequence. By constructing the distributed energy storage system, power supply can be provided through the distributed energy storage system when the power supply in the station and the power supply outside the station are both unreliable, and the deployment flexibility and power safety reliability of the substation station AC power supply system using the distributed energy storage are improved.

[0033] As Figure 4 The sensor signal conditioning circuit comprises an analog signal input end, resistors R1 and R2, a capacitor C1 and an operational amplifier U1, one end of the resistor R1 is connected to the analog signal input end, one end of the resistor R2 is connected to the analog signal input end, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the other end of the resistor R1 and the positive input end of the operational amplifier U1, and the negative input end of the operational amplifier U1 is connected to the output end of the operational amplifier U1.

[0034] As the key device of the conditioning circuit, the utility model selects the AD8608 operational amplifier chip of ADI company, the chip combines many excellent characteristics, has four-way track input and output while being powered by a single power supply, can guarantee extremely low noise and input bias current while guaranteeing high speed, and is widely applicable to various circuits.

[0035] Since the input impedance of the operational amplifier is generally high, the input pin is easily disturbed by the outside world when it is suspended, therefore, the resistor R2 can form a loop between the input end and the analog ground when the input pin is suspended, thereby guaranteeing the stability of the operational amplifier.

[0036] As Figure 5 The voltage signal conditioning circuit comprises a voltage signal input end, resistors R3, R4 and R5, a capacitor C2 and an operational amplifier U2, one end of the resistor R3 is connected to the voltage signal input end, the other end of the resistor R3 is connected to one end of the resistor R4 and one end of the resistor R5, one end of the resistor R5 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the other end of the resistor R4 and the positive input end of the operational amplifier U1, and the negative input end of the operational amplifier U2 is connected to the output end of the operational amplifier U2.

[0037] In the voltage conditioning circuit, rail-to-rail op-amp can maximize the input and output voltage swing close to the power supply voltage value, but there is also a large deviation in the case of large current, because the input voltage range of AD8608 is 0-0.5V, so the resistors R3 and R5 are set to form a voltage divider circuit to reduce the input voltage to below 5V.

[0038] The current collection method is different according to the size of the current and the difference between AC and DC. The commonly used current collection methods include coaxial shunt method, current transformer method, Rogowski coil method, Hall sensor method and sampling resistor method. The Hall sensor method is suitable for AC and DC current measurement and can measure large current. The current signal conditioning circuit uses ACS714 chip of Allegro company. The chip is a current isolation type current sensor with common mode rejection field effect, which is composed of high-precision low-bias linear Hall sensor.

[0039] The FGPA controls the address switching channel of the analog switch to achieve the effect of time division multiplexing. When switching the channel, the analog switch will affect the change of the capacitive load, and phenomena such as signal oscillation or ringing will occur. The faster the switching speed of the analog switch, the more obvious the phenomenon. Therefore, the selection of the analog switch is particularly important. Through analysis and comparison of various types of analog switches, the ADG706 chip is used in this design.

[0040] As shown in Figure 6 The voltage division and follow-up filter circuit includes operational amplifier U3, resistor R11, resistor R12, operational amplifier U4, resistor R13, and capacitor C7. One end of resistor R12 is connected to the output terminal of operational amplifier U3. The other end of resistor R12 is connected to one end of resistor R11 and the positive input terminal of operational amplifier U4, respectively. One end of resistor R13 is connected to the output terminal of operational amplifier U4. The other end of resistor R13 is connected to one end of capacitor C7 and the A / D conversion unit, respectively. The other end of capacitor C7 is grounded. The other end of resistor R11 is connected to the current signal conditioning circuit.

[0041] The signal passes through the voltage division, follow-up, and filter circuit, and then is input into the AD converter. The voltage follower makes the circuit have high resistance input and low resistance output, improving the load capacity of the circuit. The chip model of the operational amplifier U3 and the operational amplifier U4 is AD8031. The maximum sampling current of the ACS714 chip is 5A.

[0042] As shown in Figure 7As shown, the clock module includes a clock chip DS3231, a capacitor C4, a resistor R25, a resistor R26, a resistor R27, a resistor R28, the VCC end is connected to one end of the resistor R25 and one end of the resistor R26, the other end of the resistor R25 is connected to the SDA end of the clock chip DS3231, the other end of the resistor R26 is connected to the SCL end of the clock chip DS3231, the VDD end is connected to one end of the resistor R27, one end of the resistor R28, one end of the capacitor C4 and the 2 port of the clock chip DS3231, the other end of the resistor R27 is connected to the 1 port of the clock chip DS3231, the other end of the resistor R28 is connected to the 3 port of the clock chip DS3231, and the other end of the capacitor C4 is grounded.

[0043] The clock module of the utility model is designed and realized by selecting low-cost and high-precision real-time clock chip DS3231, the register address of DS3231 is 00h~12h, and clock and calendar information is obtained by reading appropriate register bytes.

[0044] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood as having meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0045] The above embodiments are only for illustrating the technical idea of the utility model, and cannot limit the protection scope of the utility model, and any modification made on the basis of the technical scheme according to the technical idea of the utility model falls within the protection scope of the utility model. The embodiments of the utility model have been described in detail above, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A distributed energy storage plant control system, characterized by: The application relates to a data acquisition module for data acquisition of a distributed energy storage power station, a data preprocessing module, a control module and a distributed energy storage system; the data acquisition module is connected with the control module through the data preprocessing module; the control module is connected with the distributed energy storage system. The data acquisition module comprises an alternating current voltage data acquisition unit and a switch value acquisition unit; the data preprocessing module comprises a multiplexing switch, a sensor signal conditioning circuit, a voltage signal conditioning circuit, a voltage division follow-up filter circuit and an analog-digital conversion module; the control module comprises a microcontroller module, a wireless transmission module, a data storage module, a clock module, a crystal oscillator module, an alarm module, a man-machine interaction module, a display module, an interface module and a power module; the alternating current voltage data acquisition unit and the switch value acquisition unit are connected with the microcontroller module through the multiplexing switch, the sensor signal conditioning circuit, the voltage signal conditioning circuit, the voltage division follow-up filter circuit and the analog-digital conversion module in sequence; and the distributed energy storage system, the wireless transmission module, the data storage module, the clock module, the crystal oscillator module, the alarm module, the man-machine interaction module, the display module, the interface module and the power module are connected with the microcontroller module. The distributed energy storage system comprises an energy storage battery unit, an AC-DC inversion unit, an isolation transformer and an alternating current incoming line unit; the energy storage battery unit is connected with the alternating current incoming line unit through the AC-DC inversion unit and the isolation transformer.

2. The distributed energy storage plant control system of claim 1, wherein: The sensor signal conditioning circuit comprises an analog signal input end, a resistor R1, a resistor R2, a capacitor C1 and an operational amplifier U1; the analog signal input end is connected with one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R2 is connected with one end of the capacitor C1; the other end of the capacitor C1 is connected with the other end of the resistor R1 and the positive input end of the operational amplifier U1; and the negative input end of the operational amplifier U1 is connected with the output end of the operational amplifier U1.

3. The distributed energy storage plant control system of claim 1, wherein: The voltage signal conditioning circuit comprises a voltage signal input end, a resistor R3, a resistor R4, a resistor R5, a capacitor C2 and an operational amplifier U2; the voltage signal input end is connected with one end of the resistor R3; the other end of the resistor R3 is connected with one end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 is connected with one end of the capacitor C2; the other end of the capacitor C2 is connected with the other end of the resistor R4 and the positive input end of the operational amplifier U1; and the negative input end of the operational amplifier U2 is connected with the output end of the operational amplifier U2.

4. The distributed energy storage plant control system of claim 2, wherein: The voltage division follow-up filter circuit comprises an operational amplifier U3, a resistor R11, a resistor R12, an operational amplifier U4, a resistor R13 and a capacitor C7; the output end of the operational amplifier U3 is connected with one end of the resistor R12; the other end of the resistor R12 is connected with one end of the resistor R11 and the positive input end of the operational amplifier U4; the output end of the operational amplifier U4 is connected with one end of the resistor R13; the other end of the resistor R13 is connected with one end of the capacitor C7 and an A / D conversion unit; the other end of the capacitor C7 is grounded; and the other end of the resistor R11 is connected with a current signal conditioning circuit.

5. The distributed energy storage plant control system of claim 1, wherein: ​ 6. The distributed energy storage plant control system of claim 1, wherein: The clock module comprises a clock chip DS3231, a capacitor C4, a resistor R25, a resistor R26, a resistor R27, a resistor R28, the VCC end is connected with one end of the resistor R25 and one end of the resistor R26 respectively, the other end of the resistor R25 is connected with the SDA end of the clock chip DS3231, the other end of the resistor R26 is connected with the SCL end of the clock chip DS3231, the VDD end is connected with one end of the resistor R27, one end of the resistor R28, one end of the capacitor C4 and the 2 port of the clock chip DS3231 respectively, the other end of the resistor R27 is connected with the 1 port of the clock chip DS3231, the other end of the resistor R28 is connected with the 3 port of the clock chip DS3231, and the other end of the capacitor C4 is grounded.

Images