Intelligent control device for distribution network power system

Abstract

The utility model discloses an intelligent control device for a distribution network electric power system, which comprises an intelligent control device main body connected with the distribution network electric power system, and the distribution network electric power system comprises a solar photovoltaic group, an inverter, a battery pack, an electric energy metering device, a data communication device I, a power sensor and a battery electric quantity metering device. According to the utility model, the power generation condition and the output power can be monitored in real time in the operation process of the distribution network power system, and the angle of the solar photovoltaic group can be intelligently adjusted according to the combination of the electric energy and the solar trace when the electric energy is relatively low, so that the solar photovoltaic group can generate power stably, the power generation efficiency is improved, and the energy consumption is reduced. And the output power of the inverter can be adjusted during the peak period of the power grid, so that stable voltage supply can be realized, the operation stability of the distribution network power system is improved, in addition, the charging and discharging conditions of the battery pack can be managed and controlled, and the battery pack is effectively protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of distribution network power system, especially to a distribution network power system intelligent control device. BACKGROUND

[0002] The distribution network power system refers to the power network that accepts electric energy from the power transmission network or the regional power plant and then distributes to various users by distribution facilities according to regions or step by step, which is mainly composed of overhead lines, cables, distribution transformers, disconnectors and the like, and the control device of the traditional distribution network power system is more inclined to basic power system monitoring, protection and control functions, such as overload protection, short-circuit protection, frequency and voltage regulation, etc., and lacks the function of intelligently controlling the power generation efficiency and operation stability of the distribution network power system, the power generation efficiency of the distribution network power system is related to the installation and arrangement of the solar photovoltaic group, when the power generation efficiency is low, the solar photovoltaic group cannot be adjusted and controlled in time, in addition, the operation stability is affected by the output power, and the power output cannot be adjusted according to the demand of the power grid, so that the operation stability of the entire distribution network power system is poor, and in view of the above situation, the present application provides a distribution network power system intelligent control device. SUMMARY

[0003] The utility model discloses a distribution network power system intelligent control device that solves the shortcomings in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A distribution network power system intelligent control device, comprising an intelligent control device main body connected with a distribution network power system, the distribution network power system comprising a solar photovoltaic group, an inverter, a battery pack, an electric energy metering device, a data communication equipment one, a power sensor and a battery power metering equipment, the solar photovoltaic group being connected with the battery pack and the electric energy metering device, the inverter being connected with the battery pack and the power sensor, the inverter further being connected with a load, the battery pack being connected with the battery power metering equipment, the data communication equipment one being connected with the electric energy metering device, the power sensor and the battery power metering equipment;

[0006] The intelligent control device main body comprises a man-machine interface, an intelligent controller, an adjustment optimization device, a data storage equipment, a data collector, a data communication equipment two and a sun tracking sensor, the intelligent controller being connected with the man-machine interface, the adjustment optimization device and the data collector, the data collector being connected with the data communication equipment two, the sun tracking sensor and the data storage equipment, the adjustment optimization device being connected with the solar photovoltaic group, the inverter and the battery pack, and the data communication equipment two being connected with the data communication equipment one.

[0007] Preferably, the intelligent controller comprises a data processing and analysis module, a control strategy formulation module and a control module, the data processing and analysis module is connected with the control strategy formulation module, the control module and a data collector;

[0008] The adjustment optimization device comprises a solar photovoltaic group angle adjustment device, a pulse width modulation control circuit and a charge and discharge management (BMS) controller, and the control module is connected with the solar photovoltaic group angle adjustment device, the pulse width modulation control circuit and the charge and discharge management (BMS) controller.

[0009] Preferably, the control strategy formulation module is operated through a man-machine interaction interface, and the formulated strategy is input into the control strategy formulation module.

[0010] The formulated strategy comprises: (1) the electric energy of the solar photovoltaic group measured by the electric energy metering device is less than 5KW, the angle of the solar photovoltaic group needs to be adjusted according to the position of the sun tracked by the sun tracking sensor, and the electric energy of the solar photovoltaic group = the rated power of the solar photovoltaic module * the illumination time;

[0011] (2) according to the output power of the inverter measured by the power sensor, when the power demand of the power grid is high, the output power of the inverter is increased;

[0012] (3) according to the calculation of the electric quantity in the battery group by the battery electric quantity metering equipment, when the electric quantity is less than the total capacity of the battery group, the battery group switch is opened to charge and the discharge rate of the battery group is adjusted, the electric quantity = the total capacity of the battery group, and the battery group switch is closed to stop charging.

[0013] Preferably, the solar photovoltaic group angle adjustment device comprises a holding brake motor fixedly installed at the top of a mounting plate, a connecting plate fixedly connected to the top end of the output shaft of the holding brake motor, a solar photovoltaic group rotatably installed at the top left side of the connecting plate, and a same electric telescopic rod rotatably installed between the bottom of the solar photovoltaic group and the top of the connecting plate, the holding brake motor and the electric telescopic rod are electrically connected with the control module, the holding brake motor is used for adjusting the orientation angle of the solar photovoltaic group, and the electric telescopic rod is used for adjusting the inclination angle of the solar photovoltaic group.

[0014] Preferably, the pulse width modulation control circuit is used for regulating the output power of the inverter, and the pulse width modulation control circuit comprises a comparator U1 and a comparator U2, one end of a resistor R2, one end of a resistor R5 and one end of a resistor R3 are electrically connected to a pin 1 of the comparator U1, one end of a switch S1 and one end of a resistor R1 are electrically connected to the other end of the resistor R2, the other end of the switch S1 is electrically connected to an output end of the inverter, the other end of the resistor R5, a pin 3 of the comparator U1 and the other end of the resistor R1 are grounded, a pin 2 of the comparator U1 is electrically connected to a pin 2 of the comparator U2 and the other end of the resistor R3, one end of a capacitor C1 is electrically connected to the pin 2 of the comparator U1, one end of a capacitor C2, one end of a resistor R6, one end of a capacitor C3 and one end of a resistor R4 are electrically connected to a pin 3 of the comparator U2, the other end of the resistor R4 is electrically connected to one end of the switch S1, the other end of the resistor R6, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded, one end of a resistor R7 is electrically connected to a pin 1 of the comparator U2, the other end of the resistor R7 is electrically connected to one end of the switch S1, the other end of the capacitor C3 is electrically connected to the pin 1 of the comparator U2, and the pin 1 of the comparator U2 is electrically connected to a load.

[0015] Preferably, the charge and discharge management (BMS) controller is used for controlling the charging and discharging process of the battery pack according to the formulated strategy.

[0016] Preferably, the data collector is used for collecting the data of the electric energy metering device, the power sensor, the battery power metering equipment and the sun tracking sensor, the collected data is transmitted to the data storage equipment for storage, and the collected data is transmitted to a data processing and analysis module of the intelligent controller, the data processing and analysis module analyzes according to the formulated strategy using the judgment logic, and the analysis result is transmitted to the control module for control.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The utility model can monitor the power generation and output power in real time in the operation process of the distribution network power system, can intelligently adjust the angle of the solar photovoltaic group according to the combination of the electric energy and the sun tracking when the electric energy is low, so that the solar photovoltaic group can stably generate power, improve the power generation efficiency, can adjust the output power of the inverter when the power grid is in peak, so that stable voltage supply can be realized, the operation stability of the distribution network power system is improved, and the charging and discharging of the battery pack can be managed and controlled, so that the battery pack is effectively protected. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A connection block diagram of the intelligent control device of the distribution network power system is provided in the utility model.

[0020] Figure 2 A block diagram of the connection of the intelligent controller, the data collector and the adjusting and optimizing device of the intelligent control device of the distribution network power system is provided for the utility model;

[0021] Figure 3 A schematic diagram of the solar photovoltaic group angle adjusting device of the intelligent control device of the distribution network power system is provided for the utility model;

[0022] Figure 4 A circuit diagram of the pulse width modulation control circuit of the intelligent control device of the distribution network power system is provided for the utility model.

[0023] In the figure: 100, mounting plate; 200, brake motor; 300, connecting plate; 400, electric telescopic rod. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] Referring to Figures 1-4 An intelligent control device of a distribution network power system, comprising an intelligent control device main body connected with the distribution network power system, the distribution network power system comprising a solar photovoltaic group, an inverter, a battery group, an electric energy metering device, a data communication equipment one, a power sensor and a battery electric quantity metering equipment, the solar photovoltaic group being connected with the battery group and the electric energy metering device, the inverter being connected with the battery group and the power sensor, the inverter further being connected with a load, the battery group being connected with the battery electric quantity metering equipment, the data communication equipment one being connected with the electric energy metering device, the power sensor and the battery electric quantity metering equipment;

[0026] The electric energy metering device is used for measuring the electric energy of the solar photovoltaic group, the power sensor is used for measuring the output power of the inverter, and the battery electric quantity metering equipment is used for calculating the electric quantity of the battery group. The electric energy metering device, the power sensor and the battery electric quantity metering equipment are all existing entity devices, the principle of which is prior art, which will not be described here in detail.

[0027] The intelligent control device main body comprises a man-machine interactive interface, an intelligent controller, an adjusting and optimizing device, a data storage equipment, a data collector, a data communication equipment two and a sun tracking sensor. The intelligent controller is connected with the man-machine interactive interface, the adjusting and optimizing device and the data collector. The data collector is connected with the data communication equipment two, the sun tracking sensor and the data storage equipment. The adjusting and optimizing device is connected with the solar photovoltaic group, the inverter and the battery group. The data communication equipment two is connected with the data communication equipment one.

[0028] The intelligent controller comprises a data processing and analysis module, a control strategy making module and a control module, the data processing and analysis module is connected with the control strategy making module, the control module and a data collector;

[0029] The control strategy making module is operated through a man-machine interface and inputs the formulated strategy into the control strategy making module;

[0030] The formulated strategy comprises: (1) the electric energy of the solar photovoltaic group measured by the electric energy metering device < 5KW, the angle of the solar photovoltaic group needs to be adjusted according to the position of the sun tracked by the sun tracking sensor, the electric energy of the solar photovoltaic group = the rated power of the solar photovoltaic module * the illumination time;

[0031] (2) according to the output power of the inverter measured by the power sensor, when the power demand of the power grid is high, the output power of the inverter is increased;

[0032] (3) according to the calculation of the electric quantity in the battery group by the battery electric quantity metering equipment, when the electric quantity < the total capacity of the battery group, the battery group switch is opened to charge and the discharge rate of the battery group is adjusted, the electric quantity = the total capacity of the battery group, the battery group switch is closed to stop charging;

[0033] The data collector is used to collect the data of the electric energy metering device, the power sensor, the battery electric quantity metering equipment and the sun tracking sensor, the collected data is transmitted to the data storage equipment for storage, and the collected data is transmitted to the data processing and analysis module of the intelligent controller, the data processing and analysis module analyzes according to the formulated strategy using the judgment logic, and the analysis result is transmitted to the control module for control; the program for analyzing by the data analysis module using the judgment logic is prior art, the formulated strategy is input into the original judgment logic program, and the result can be directly analyzed;

[0034] The program of the judgment logic is as follows:

[0035] #Assume that the input data is the output power of the inverter;

[0036] solar_power = 800

[0037] #Formulated strategy: when the power demand of the power grid is high, the output power of the inverter is increased if solar_power < 1000:

[0038] print("Increase the output power of the inverter") else:

[0039] print("Maintain the existing power");

[0040] The adjusting optimization device comprises a solar photovoltaic group angle adjusting device, a pulse width modulation control circuit and a charge and discharge management (BMS) controller, a control module is connected with the solar photovoltaic group angle adjusting device, the pulse width modulation control circuit and the charge and discharge management (BMS) controller, wherein the charge and discharge management (BMS) controller is used for controlling the charge and discharge process of the battery group according to a formulated strategy, and the principle that the charge and discharge management (BMS) controller controls the charge and discharge of the battery group is prior art and is not described here in detail.

[0041] The solar photovoltaic group angle adjusting device comprises a brake motor 200 fixedly installed on the top of the mounting plate 100, a connecting plate 300 fixedly connected to the top end of the output shaft of the brake motor 200, a solar photovoltaic group rotatably installed on the top left side of the connecting plate 300, and an electric telescopic rod 400 rotatably installed between the bottom of the solar photovoltaic group and the top of the connecting plate 300, wherein the brake motor 200 and the electric telescopic rod 400 are electrically connected with the control module, the brake motor 200 is used for adjusting the orientation angle of the solar photovoltaic group, and the electric telescopic rod 400 is used for adjusting the inclination angle of the solar photovoltaic group.

[0042] In addition, the installation modes of the electric telescopic rod 400 and the drive motor 200 can be adjusted according to the installation condition, as long as the installation mode can adjust the angle of the solar photovoltaic group.

[0043] The pulse width modulation control circuit is used for regulating the output power of the inverter, and the pulse width modulation control circuit comprises a comparator U1 and a comparator U2, one end of a resistor R2, one end of a resistor R5 and one end of a resistor R3 are electrically connected with a pin 1 of the comparator U1, one end of a switch S1 and one end of a resistor R1 are electrically connected with the other end of the resistor R2, the other end of the switch S1 is electrically connected with an output end of the inverter, the other end of the resistor R5, a pin 3 of the comparator U1 and the other end of the resistor R1 are grounded, a pin 2 of the comparator U1 is electrically connected with a pin 2 of the comparator U2 and the other end of the resistor R3, one end of a capacitor C1 is electrically connected with the pin 2 of the comparator U1, one end of a capacitor C2, one end of a resistor R6, one end of a capacitor C3 and one end of a resistor R4 are electrically connected with a pin 3 of the comparator U2, the other end of the resistor R4 is electrically connected with one end of the switch S1, the other end of the resistor R6, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded, one end of a resistor R7 is electrically connected with a pin 1 of the comparator U2, the other end of the resistor R7 is electrically connected with one end of the switch S1, the other end of the capacitor C3 is electrically connected with the pin 1 of the comparator U2, the pin 1 of the comparator U2 is electrically connected with a load, the comparator U1 is a square wave oscillator, the comparator U2 is used for adjusting the output pulse width, and the adjustment of the output power of the inverter can be realized by adjusting the output pulse width.

[0044] The utility model discloses can be in the process of operating in the distribution network electric power system to the power generation situation and the output power real -time monitoring, can be when the electric energy is low, according to the electric energy and solar track combination to the angle of solar photovoltaic group intelligent adjustment, so that solar photovoltaic group can steady power generation, improve the power generation efficiency, and can be in the power grid peak, the output power of inverter is adjusted, thereby can realize steady supply pressure, improve the operating stability of distribution network electric power system, in addition can manage control to the charge -discharge condition of battery group, effectively protect battery group.

[0045] Principle: when using, personnel beforehand through man -machine interface control strategy formulation module input formulated strategy, the solar photovoltaic group in distribution network electric power system absorbs the external solar energy and changes into electric energy and stores in battery group, inverter changes the direct current in battery group into alternating current and supplies power for load, in the process that solar photovoltaic group absorbs solar energy and changes electric energy, electric energy metering device measures the electric energy of solar photovoltaic group, power sensor measures the output power of inverter, battery power metering equipment measures the power condition in battery group, and the data of measurement and measurement are transmitted to data collector through data communication equipment one and data communication equipment two, and data collector collects data, and simultaneously, solar tracking sensor also detects the track of sun, and the detected data is also transmitted to data collector, and data collector transmits the collected data to data storage device and stores, and simultaneously, the collected data is transmitted to the data processing and analysis module of intelligent controller, and the data processing and analysis module analyzes using judgment logic according to the formulated strategy;

[0046] When the electric energy of solar photovoltaic group measured by electric energy metering device is less than 5KW, signal is transmitted to control module, and control module controls brake motor 200 or electric telescopic rod 400, and when brake motor 200 is opened, the output shaft of brake motor 200 can drive solar photovoltaic group to rotate through connecting plate 300, so that the orientation angle changes, and when electric telescopic rod 400 is opened, the output shaft of electric telescopic rod 400 drives solar photovoltaic group to rotate, so that the inclination angle changes, and when the required angle is adjusted according to the use requirement, control module can control brake motor 200 and electric telescopic rod 400 to close, and the angle of solar photovoltaic group is adjusted according to the electric energy and solar track combination, so that solar photovoltaic group can steady power generation, and the power generation efficiency is improved;

[0047] When it is analyzed that the power grid is in peak, the output power of the inverter needs to be increased, then the control module controls the switch S1 to be turned on, so that the output voltage passes through the comparator U1 and the comparator U2 in turn, the comparator U1 is a square wave oscillator, the sawtooth wave is led out on the oscillation capacitor C1 and sent to the inverting input end of the comparator U2, the non-inverting input end of the comparator U2 adjusts the output pulse width, so as to achieve the purpose of adjusting the pulse width, the output power of the inverter is increased through adjusting the pulse width, so that stable voltage supply can be realized, and stable power supply during the power grid peak can be ensured;

[0048] In addition, when it is analyzed that the battery group power < the total capacity of the battery group, the control module controls the charging switch of the battery group to be turned on through the charge and discharge management (BMS) controller, charging is carried out, and the discharge rate parameter of the battery group is adjusted, when the battery group power = the total capacity of the battery group, the battery group switch is controlled to be turned off to stop charging, through the charge and discharge management of the battery group, the battery group can be effectively protected, and the risk of overcharging and overdischarging of the battery group is reduced.

[0049] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and the utility model concept of the utility model, equivalent replacement or change, should be covered in the protection scope of the utility model.

Claims

1. An intelligent control device for a power distribution network system, comprising an intelligent control device body connected to the power distribution network system, characterized in that, The power distribution network system includes a solar photovoltaic array, an inverter, a battery bank, an energy metering device, a data communication device, a power sensor, and a battery power metering device. The solar photovoltaic array is connected to the battery bank and the energy metering device. The inverter is connected to the battery bank and the power sensor. The inverter is also connected to a load. The battery bank is connected to the battery power metering device. The data communication device is connected to the energy metering device, the power sensor, and the battery power metering device. The main body of the intelligent control device includes a human-machine interface, an intelligent controller, an adjustment and optimization device, a data storage device, a data acquisition device, a second data communication device, and a solar tracking sensor. The intelligent controller is connected to the human-machine interface, the adjustment and optimization device, and the data acquisition device. The data acquisition device is connected to the second data communication device, the solar tracking sensor, and the data storage device. The adjustment and optimization device is connected to the solar photovoltaic array, the inverter, and the battery pack. The second data communication device is connected to the first data communication device.

2. The intelligent control device for a power distribution network system according to claim 1, characterized in that, The adjustment and optimization device includes a solar photovoltaic array angle adjustment device, a pulse width modulation control circuit, and a charge and discharge management (BMS) controller. The control module is connected to the solar photovoltaic array angle adjustment device, the pulse width modulation control circuit, and the charge and discharge management (BMS) controller.

3. The intelligent control device for a power distribution network system according to claim 1, characterized in that, The solar photovoltaic array angle adjustment device includes a brake motor (200) fixedly installed on the top of the mounting plate (100). The top of the output shaft of the brake motor (200) is fixedly connected to a connecting plate (300). The solar photovoltaic array is rotatably installed on the top left side of the connecting plate (300). The bottom of the solar photovoltaic array and the top of the connecting plate (300) are rotatably installed with the same inclined electric telescopic rod (400). The brake motor (200) is used to adjust the orientation angle of the solar photovoltaic array, and the electric telescopic rod (400) is used to adjust the tilt angle of the solar photovoltaic array.

4. The intelligent control device for a power distribution network system according to claim 2, characterized in that, The pulse width modulation (PWM) control circuit is used to regulate the output power of the inverter. The PWM control circuit includes comparators U1 and U2. Pin 1 of comparator U1 is electrically connected to one end of resistor R2, one end of resistor R5, and one end of resistor R3. The other end of resistor R2 is electrically connected to one end of switch S1 and one end of resistor R1. The other end of switch S1 is electrically connected to the output terminal of the inverter. The other end of resistor R5, pin 3 of comparator U1, and the other end of resistor R1 are all grounded. Pin 2 of comparator U1 is electrically connected to pin 2 of comparator U2. Pin 2 of comparator U1 is also connected to the other end of resistor R3. Electrically connected, pin 2 of comparator U1 is electrically connected to one end of capacitor C1, pin 3 of comparator U2 is electrically connected to one end of capacitor C2, one end of resistor R6, one end of capacitor C3 and one end of resistor R4, the other end of resistor R4 is electrically connected to one end of switch S1, the other ends of resistor R6, capacitor C1 and capacitor C2 are all grounded, pin 1 of comparator U2 is electrically connected to one end of resistor R7, the other end of resistor R7 is electrically connected to one end of switch S1, the other end of capacitor C3 is electrically connected to pin 1 of comparator U2, and pin 1 of comparator U2 is electrically connected to the load.

5. The intelligent control device for a power distribution network system according to claim 2, characterized in that, The charge / discharge management (BMS) controller is used to control the charging and discharging process of the battery pack according to a defined strategy.

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