Photovoltaic inverter system interactively controlled with load

Abstract

The utility model provides a photovoltaic inverter system interactively controlled with a load. The system comprises a plurality of photovoltaic cell panels and an inverter connected with the photovoltaic cell panels, the output end of the inverter is connected with a local load and a power grid, the power grid is connected with a power grid electricity load, and the local load and the power grid electricity load are both connected with an intelligent electric energy meter. Meanwhile, a voltage sampling module and a current sampling module are arranged on a line from the inverter to the power grid and are connected with the central node controller, and the central node controller is further electrically connected with the power module and the wireless DTU module. The inverter internally comprises a plurality of parts such as a control module and a driving module. According to the system, data can be acquired through the intelligent electric energy meter and the sampling module, and electric energy distribution is accurately controlled through the central node controller; comprehensive real-time monitoring and intelligent regulation are realized, and the stability of the system is guaranteed; by means of the 4G / 5G wireless communication technology, efficient remote management is supported.

Description

TECHNICAL FIELD

[0001] The utility model discloses photovoltaic power generation technical field, concretely is a photovoltaic inverter system of interactive control with load. BACKGROUND

[0002] With the global demand for clean energy continues to grow, photovoltaic power generation as an important renewable energy utilization mode, has been widely concerned. In the current photovoltaic inverter system field, although certain development has been made in technology, but still faces many problems, and urgent need for innovative solutions.

[0003] The traditional photovoltaic inverter system lacks precise control in power distribution. On the one hand, it cannot real-time perceive the actual demand changes of local load and power grid load. For example, when the local load demand is low, the excess photovoltaic power cannot be reasonably distributed, direct grid connection may cause power grid voltage fluctuation, and improper storage may also cause energy waste; on the other hand, when the power grid load is high or the photovoltaic power generation is surplus, the power flow cannot be flexibly adjusted, and the efficient use of energy is difficult to achieve, which reduces the overall benefit of the photovoltaic power generation system.

[0004] The existing system does not comprehensively and accurately monitor the line from the inverter to the power grid. The collection of key parameters such as voltage and current has delay or error, which cannot provide timely and accurate data support for system control. This makes it difficult to respond quickly and effectively control when facing abnormal situations such as power grid voltage fluctuation and power overload. For example, when the power grid voltage suddenly drops, the equipment may be damaged or the power supply may be interrupted due to the inability to adjust the inverter output power in time, which seriously affects the stability and reliability of the system.

[0005] Many photovoltaic inverter systems have backward communication methods, and there are obstacles in communication between smart meters and control centers, and between inverters and other devices. The data transmission speed is slow and the stability is poor, which cannot realize remote real-time monitoring and management. It is difficult for staff to remotely obtain system operation data, and problems cannot be found and solved in time, increasing maintenance cost and system failure risk. For example, in remote photovoltaic power stations, if a fault occurs, due to poor communication, maintenance personnel cannot know the situation in time and handle it, resulting in long-term failure of the power station. UTILITY MODEL CONTENTS

[0006] The technical problem to be solved by the utility model is to provide a photovoltaic inverter system with interactive control of load, which can accurately distribute power, realize comprehensive real-time monitoring and intelligent control, ensure stable and reliable operation of the system and support efficient remote management.

[0007] To solve the above technical problems, the utility model discloses an embodiment provides the following technical scheme: a photovoltaic inverter system of interactive control with load, including a plurality of photovoltaic cell panels and the inverter of a plurality of photovoltaic cell panel output end connection, a plurality of inverter output end connection local load, power grid, the power grid is connected with power grid electricity load, local load, power grid electricity load all connects intelligent electric energy meter, voltage sampling module, current sampling module are still arranged on the line of inverter to power grid, voltage sampling module, current sampling module connect central node controller, central node controller and power module, wireless DTU module electric connection;

[0008] The inverter includes a control module, a drive module, a full-bridge inverter circuit, a filter device and a protection module, the control module, the drive module, the full-bridge inverter circuit and the filter device are connected in sequence, the full-bridge inverter circuit is further connected to the protection module, the output end of the protection module is connected to the control module, the control module is further connected to a wireless communication module, the output end of the photovoltaic cell panel is connected to the drive module, and the output end of the photovoltaic cell panel is connected to the control module through a DC-DC module.

[0009] Optionally, the plurality of inverters are provided with a wireless control switch K1 on the common line connected to the local load and the power grid, a wireless control switch K2 is arranged on the line from the wireless control switch K1 to the local load, and a wireless control switch K3 is arranged on the line from the wireless control switch K1 to the power grid.

[0010] Optionally, the intelligent electric energy meter is an intelligent electric meter with 4G / 5G wireless communication function.

[0011] Optionally, the central node controller is an industrial computer.

[0012] Optionally, the wireless DTU module is a 4G / 5G wireless DTU module.

[0013] Optionally, the control module is a single-chip microcomputer, an ARM processor or a DSP processor.

[0014] Optionally, the drive module is an IR2110 chip.

[0015] Optionally, the protection module includes a voltage detection circuit, a current detection circuit and an AD converter based on an operational amplifier, and the output end of the voltage detection circuit and the current detection circuit is electrically connected to the AD converter.

[0016] Optionally, the wireless communication module is a 4G / 5G wireless communication chip.

[0017] Optionally, the K1, K2 and K3 are 4G / 5G wireless electric control switches.

[0018] The beneficial effects of the above technical solutions of the utility model are as follows:

[0019] 1、The utility model discloses a local load and the electric energy data of power grid electric load are gathered to the intelligent electric energy meter, and the voltage, current sampling data on the inverter to the power grid line are combined, and the comprehensive analysis is carried out by the center node controller. Can be according to actual power demand, accurately control wireless control switch K1, K2, K3, and reasonably distribute photovoltaic electric energy. When the local load power consumption is low and the power grid does not need to be connected, K3 can be cut off, to avoid energy waste. When the local load demand is big, local power supply is preferentially satisfied, and the energy utilization efficiency is improved.

[0020] 2、The utility model discloses voltage sampling module, current sampling module and intelligent electric energy meter are utilized, realize to the system comprehensive real-time monitoring. According to the monitoring data, with the aid of wireless DTU module and wireless communication module, the center node controller carries out intelligent regulation and control to photovoltaic power generation power and grid-connected line. According to the voltage fluctuation of power grid, power demand change and so on, timely adjustment inverter output power, guarantee the stable operation of power grid, improve the intelligent management level of system.

[0021] 3、The voltage detection circuit and current detection circuit in the protection module of the utility model monitor full-bridge inverter circuit in real time, once detect the abnormality, after AD converter processing, transmission to control module. Control module adjusts inverter working condition in time or sends out alarm signal, effectively avoids the equipment damage, and the stability and reliability of system are enhanced.

[0022] 4、The utility model discloses 4G / 5G wireless communication technology, intelligent electric energy meter, wireless DTU module, wireless communication module and center node controller can transmit data quickly and accurately. Support remote control and monitoring, and staff can operate wireless control switch remotely through center node controller, and the on-off control of photovoltaic grid-connected line is carried out, realizes remote management and maintenance, and improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the photovoltaic inverter system control system principle block diagram of the utility model's interactive control with load;

[0024] Figure 2 It is the inverter principle block diagram of the utility model's interactive control with load photovoltaic inverter system;

[0025] Figure 3 It is the driving module circuit principle diagram of the utility model's interactive control with load photovoltaic inverter system;

[0026] Figure 4 It is the full-bridge inverter circuit principle diagram of the utility model's interactive control with load photovoltaic inverter system;

[0027] Figure 5 The utility model discloses a photovoltaic inverter system current detection circuit principle diagram of interactive control with load,

[0028] Figure 6 The utility model discloses a photovoltaic inverter system voltage detection circuit principle diagram of interactive control with load. DETAILED DESCRIPTION

[0029] In order to make the technical problem, technical scheme and advantage that the utility model is going to solve more clear, below will combine with the detailed description of embodiment and the drawing.

[0030] As Figure 1 The utility model discloses a photovoltaic inverter system of interactive control with load, including a plurality of photovoltaic cell panel 1 and with a plurality of photovoltaic cell panel 1 output end connection's inverter 2, a plurality of inverter 2 output end connection local load 6, power grid 9, power grid 9 on connection power grid and use electric load 8, local load 6, power grid and use electric load 8 all connection intelligent electric energy meter 7, inverter 2 to the line of power grid 9 still set up voltage sampling module, current sampling module, voltage sampling module, current sampling module connection center node controller 3, center node controller 3 with power module 4, wireless DTU module 5 electricity is connected;

[0031] As Figure 2 The utility model discloses a photovoltaic inverter system of interactive control with load, including a plurality of photovoltaic cell panel 1 and with a plurality of photovoltaic cell panel 1 output end connection's inverter 2, a plurality of inverter 2 output end connection local load 6, power grid 9, power grid 9 on connection power grid and use electric load 8, local load 6, power grid and use electric load 8 all connection intelligent electric energy meter 7, inverter 2 to the line of power grid 9 still set up voltage sampling module, current sampling module, voltage sampling module, current sampling module connection center node controller 3, center node controller 3 with power module 4, wireless DTU module 5 electricity is connected;

[0032] Among them, a plurality of inverter 2 connection local load 6, power grid 9's common line is set up wireless control switch K1, wireless control switch K1 to local load 6's line is set up wireless control switch K2, wireless control switch K1 to power grid 9's line is set up wireless control switch K3. for the on-off control of each branch line, for example, when the power grid does not need photovoltaic power generation site power grid, control cut-off K3.

[0033] Intelligent electric energy meter 7 is the intelligent electric meter with 4G / 5G wireless communication function, is sent to center node controller 3 after being used to gather the electric energy data of local load 6, power grid and use electric load 8, wireless.

[0034] The central node controller 3 is an industrial computer, which is used for collecting the voltage and current of the photovoltaic power generation output, and receiving the power consumption data of the local load 6 and the grid power consumption load 8 sent by the smart electric energy meter 7, and controlling the photovoltaic power generation power or the grid-connected line of the photovoltaic power generation.

[0035] The wireless DTU module 5 is a 4G / 5G wireless DTU module, which is used for wirelessly receiving the power consumption data of the local load 6 and the grid power consumption load 8 sent by the smart electric energy meter 7, and the power generation data of the photovoltaic power generation site, and wirelessly sending the photovoltaic power generation power adjustment or the on-off control signal of the grid-connected line of the photovoltaic power generation.

[0036] The control module 21 is a single-chip microcomputer, an ARM processor or a DSP processor, which is used for controlling the inverter driving module.

[0037] The driving module 22 is an IR2110 chip, which is used for driving the full-bridge inverter circuit 23 to work and realize the direct current to alternating current control. Figure 3 It is an IR2110 chip schematic diagram, which includes U3 and U4. Figure 4 The full-bridge inverter circuit 23 is Q1, Q2, Q3 and Q4, which are four switching tubes. The control module 21 sends a PWM driving control signal to the IR2110 chip, and then the IR2110 chip controls to make Q1, Q2, Q3 and Q4 open and close continuously, and the four switching tubes are turned on and off alternately, so as to form an alternating current.

[0038] The protection module 25 includes a voltage detection circuit, a current detection circuit and an AD converter based on an operational amplifier, and the output ends of the voltage detection circuit and the current detection circuit are electrically connected with the AD converter, as shown in Figure 5 As shown in the current detection circuit schematic diagram, the output current detection circuit is realized by a sampling differential amplification circuit of an operational amplifier LMC6482. As shown in Figure 6 As shown in the voltage detection circuit schematic diagram, the output voltage is reduced to the sampling range of the ADC by using a differential circuit of an operational amplifier LMC6482, and then the ADC is used for sampling.

[0039] The wireless communication module 10 is a 4G / 5G wireless communication chip, which is used for wirelessly sending the photovoltaic power inverter control signal to the central node controller 3, and receiving the photovoltaic power inverter control signal of the central node controller 3 to adjust the output power of the inverter.

[0040] K1, K2 and K3 are 4G / 5G wireless electric control switches, which are used for the on-off control of the grid-connected line of the photovoltaic power generation according to the wireless control signal sent by the central node controller 3.

[0041] The working principle of the utility model is:

[0042] The utility model discloses a photovoltaic cell panel generates direct current and converts into alternating current, realizes the interaction with load and power grid through intelligent control, and has monitoring, protection and communication function simultaneously, ensures that system stable and efficient operation.

[0043] Firstly, multiple photovoltaic cell panels generate direct current, one way directly input drive module (IR2110 chip), another way connects control module after DC-DC module adjustment.Control module sends PWM drive control signal to IR2110 chip, and four switch tubes (Q1, Q2, Q3, Q4) in full-bridge inverter circuit are driven to turn on and cut off alternately in turn, and direct current is inverted into alternating current, and then stable alternating current is output through filtering device, and local load is powered or merged into power grid.

[0044] Local load and power grid power load are connected with intelligent electric energy meter, and intelligent electric energy meter sends to central node controller through 4G / 5G wireless communication function after gathering electric energy data.Voltage sampling module and current sampling module on the line of inverter to power grid gather voltage and current data and transmit to central node controller.Central node controller sends control signal through wireless DTU module according to these data, in combination with system operation demand.If power grid does not need photovoltaic power generation grid connection, central node controller controls wireless control switch K3 and cuts off grid connection line, and if load power demand changes, can control K1, K2 or K3 and adjusts load power supply reasonably.

[0045] Voltage detection circuit and current detection circuit in protection module monitor the voltage and current of full-bridge inverter circuit in real time, and detection signal is transmitted to control module after AD converter processing.When detecting abnormality, control module adjusts inverter working condition in time or sends alarm signal, and avoids equipment damage.Control module also interacts signal with central node controller through wireless communication module, receives the control instruction of central node controller, and adjusts inverter output power.

[0046] The above is the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, can make several improvements and refinements, and these improvements and refinements should be regarded as the protection scope of the utility model.

Claims

1. A photovoltaic inverter system controlled in interaction with a load, characterized in that, The application relates to a photovoltaic system, which comprises a plurality of photovoltaic panels and inverters connected with the output ends of the plurality of photovoltaic panels, the plurality of inverter output ends are connected with local loads and a power grid, the power grid is connected with power grid electricity loads, the local loads and the power grid electricity loads are connected with intelligent electric energy meters, voltage sampling modules and current sampling modules are arranged on the lines from the inverters to the power grid, the voltage sampling modules and the current sampling modules are connected with a central node controller, and the central node controller is electrically connected with a power module and a wireless DTU module. The inverter comprises a control module, a driving module, a full-bridge inverter circuit, a filtering device and a protection module, the control module, the driving module, the full-bridge inverter circuit and the filtering device are sequentially connected, the full-bridge inverter circuit is further connected with the protection module, the output end of the protection module is connected with the control module, the control module is further connected with a wireless communication module, the output end of the photovoltaic panel is connected with the driving module, and the output end of the photovoltaic panel is connected with the control module through a DC-DC module.

2. The load-interaction-controlled photovoltaic inverter system according to claim 1, characterized in that, Wireless control switches K1 are arranged on the common lines from the plurality of inverters to the local loads and the power grid, wireless control switches K2 are arranged on the lines from the wireless control switches K1 to the local loads, and wireless control switches K3 are arranged on the lines from the wireless control switches K1 to the power grid.

3. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The intelligent electric energy meter is an intelligent electric meter with 4G / 5G wireless communication function.

4. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The central node controller is an industrial computer.

5. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The wireless DTU module is a 4G / 5G wireless DTU module.

6. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The control module is a single-chip microcomputer, an ARM processor or a DSP processor.

7. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The driving module is an IR2110 chip.

8. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The protection module comprises a voltage detection circuit, a current detection circuit and an AD converter based on an operational amplifier, and the output ends of the voltage detection circuit and the current detection circuit are electrically connected with the AD converter.

9. The load interaction controlled photovoltaic inverter system of claim 1, wherein, The wireless communication module is a 4G / 5G wireless communication chip.

10. The load interaction controlled photovoltaic inverter system of claim 2, wherein, The K1, K2 and K3 are 4G / 5G wireless electric control switches.

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