Parallel operation equipment control method, device, medium, equipment and system

Abstract

The invention discloses a parallel operation equipment control method and device, a medium, equipment and a system, and the method comprises the steps: obtaining a parallel operation control signal; when the parallel operation control signal meets a parallel operation task triggering condition, receiving an external parallel operation signal output by a CAN communication module; according to the external parallel operation signal, an output relay is controlled to be conducted, and an equipment output signal output by the output end of parallel operation equipment is collected; determining a direct current component adjustment amount according to the equipment output signal; and adjusting the output voltage of the output end of the parallel operation equipment according to the external parallel operation signal, the equipment output signal and the direct current component adjustment amount. According to the technical scheme, the alternating current or direct current circulation of the parallel operation system can be suppressed, so that the output voltage amplitudes between the power supply devices in the parallel operation system can be quickly kept consistent.

Description

Technical Field

[0001] The present invention relates to the field of power supply technology, and in particular to a parallel equipment control method, device, medium, equipment and system. Background Art

[0002] With the rapid development of new energy sources such as solar energy and wind energy, the demand for inverters is increasing. The power range of traditional single-machine inverters is relatively single and cannot meet the needs of high-power loads. When the load power is greater than the inverter power, users usually need to purchase a higher-power inverter. In order to deal with this problem, parallel technology came into being. By using multiple inverters or switching power supplies in parallel, a higher power output can be achieved to meet the needs of different loads. The core challenge of the parallel system is how to achieve synchronization and current sharing between inverters. Synchronization means that multiple inverters can start and stop at the same time and have consistent output; current sharing means that each inverter can evenly distribute the load current to avoid unnecessary circulation between inverters. However, in actual applications, the parallel system faces some technical difficulties. Due to hardware differences, sampling differences, and differences in processor running time of each inverter, this will cause unnecessary circulation, affecting the overall efficiency and stability of the system. Summary of the invention

[0003] The embodiments of the present invention provide a parallel device control method, device, medium, equipment and system to solve the problem that the existing parallel system cannot synchronize and balance current.

[0004] A parallel device control method, comprising: Get parallel control signal; When the parallel control signal meets the parallel task triggering condition, an external parallel signal output by receiving the CAN communication module; According to the external parallel signal, the output relay is controlled to be turned on, and the device output signal output from the output terminal of the parallel device is collected; Determining a DC component adjustment amount according to an output signal of the device; The output voltage of the output terminal of the parallel device is adjusted according to the external parallel signal, the device output signal, and the DC component adjustment amount.

[0005] Furthermore, the parallel control signal includes a pulse signal; and the parallel task triggering condition is that the pulse signal is at a falling edge.

[0006] Further, the external parallel signal includes relay lines and signals sent by a plurality of external parallel devices; The step of controlling the output relay to be turned on according to the external parallel signal comprises: If the relay line and signal sent by each of the external parallel devices are both 1, the output relay is controlled to be turned on.

[0007] Further, the device output signal includes an output voltage; Determining the DC component adjustment amount according to the device output signal includes: If the preset device control mode is a DC voltage control mode, a DC voltage component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC voltage component; If the preset device control mode is a DC current control mode, a DC current component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC current component.

[0008] Furthermore, the external parallel signal includes external parallel power sent by multiple external parallel devices; the device output signal includes output power, output current, and output voltage phase angle; The step of adjusting the output voltage of the output terminal of the parallel device according to the external parallel signal, the device output signal, and the DC component adjustment amount includes: Determine a first power threshold and a first current threshold according to the plurality of external parallel machine powers and the output voltage phase angle; determining a first power adjustment amount according to the first power threshold, the output power and the output voltage phase angle; determining a first current adjustment amount according to the first current threshold and the output current; The output voltage of the output terminal of the parallel device is adjusted according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount.

[0009] Further, adjusting the output voltage of the output terminal of the parallel device according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount includes: superimposing the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount, and outputting a first adjustment signal; Performing single-machine off-grid adjustment on the first adjustment signal, and outputting a second adjustment signal; The second adjustment signal and the first current adjustment amount are superimposed to output a voltage adjustment signal, so as to adjust the output voltage of the output end of the parallel device through the voltage adjustment signal.

[0010] A control device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned parallel equipment control method when executing the computer program.

[0011] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the parallel device control method is implemented.

[0012] A power supply device, comprising a power supply input terminal, a CAN communication module, an output relay, a parallel device output terminal and the above-mentioned control device; The power supply input terminal is used to connect to a power supply; The CAN communication module is used to connect to an external parallel device and to transmit an external parallel signal output by the external parallel device; The output relay is arranged between the power supply input terminal and the parallel device output terminal; The control device is connected to the CAN communication module, the output relay and the output end of the parallel device.

[0013] A parallel system comprises a plurality of the above-mentioned power supply devices, wherein the CAN communication modules in each of the power supply devices are connected via a CAN communication bus; The parallel device output terminals of each of the power supply devices are connected in common for connecting to a load device.

[0014] The above-mentioned parallel equipment control method, device, medium, equipment and system obtain a parallel control signal. When the parallel control signal meets the parallel task triggering condition, the external parallel signal output by the CAN communication module is received, and the output relay is controlled to be turned on according to the external parallel signal, and the device output signal output from the output end of the parallel device is collected, so that the output relay is synchronously turned on by the external parallel signal output by the CAN communication module, saving the interface cost of sending the control signal for synchronously turning on the output relay; according to the device output signal, the DC component adjustment amount is determined, and the output voltage of the output end of the parallel device is adjusted according to the external parallel signal, the device output signal, and the DC component adjustment amount, so as to suppress the AC or DC circulation of the parallel system, so that the output voltage amplitude between the power supply devices in the parallel system can be quickly kept consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0016] Figure 1 is a flow chart of a parallel device control method in one embodiment of the present invention; Figure 2is another flow chart of a method for controlling parallel equipment in one embodiment of the present invention; Figure 3 is another flow chart of a method for controlling parallel equipment in one embodiment of the present invention; Figure 4 is another flow chart of a method for controlling parallel equipment in one embodiment of the present invention; Figure 5 is a schematic diagram of parallel control task control in one embodiment of the present invention; Figure 6 is a schematic diagram of DC component adjustment in one embodiment of the present invention; Figure 7 This is a schematic diagram of parallel equipment control in one embodiment of the present invention; Figure 8 Schematic diagram of a parallel system in one embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0019] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0020] This embodiment provides a parallel device control method, such as Figure 8 As shown, it is applied in a parallel system. Exemplarily, the parallel system includes multiple power supply devices, and the CAN communication modules in each power supply device are connected via a CAN communication bus; the parallel device output terminals of each power supply device are connected in common for connecting a load device. Optionally, the power supply device includes a switching power supply or an inverter.

[0021] As an example, the power supply device includes a power supply input terminal, a CAN communication module, an output relay, a parallel device output terminal and a control device; the power supply input terminal is used to connect the power supply; the CAN communication module is used to connect the external parallel device and to transmit the external parallel signal output by the external parallel device; the output relay is arranged between the power supply input terminal and the parallel device output terminal; the control device is connected to the CAN communication module, the output relay and the parallel device output terminal.

[0022] Exemplarily, the power supply may be an AC power supply or a DC power supply. The AC power supply may be, for example, a power grid. The DC power supply may be, for example, a photovoltaic energy storage device.

[0023] This embodiment provides a parallel device control method, such as Figure 1 As shown, applied in the above control device, including: S101: Acquire a parallel control signal.

[0024] S102: When the parallel control signal meets the parallel task triggering condition, an external parallel signal output by the CAN communication module is received.

[0025] S103: According to the external parallel signal, the output relay is controlled to be turned on, and the device output signal output from the output terminal of the parallel device is collected.

[0026] S104: Determine the DC component adjustment amount according to the device output signal.

[0027] S105: adjusting the output voltage of the output terminal of the parallel device according to the external parallel signal, the device output signal, and the DC component adjustment amount.

[0028] The parallel control signal refers to a signal used to control the power supply device to perform a parallel task. The parallel task refers to a task of supplying power to the load device together with an external parallel device. It can be understood that the external parallel device is another power supply device in the parallel system relative to the power supply device where the control device is located. The parallel task trigger condition is a pre-set trigger condition for the parallel task. The external parallel signal is a signal output by the CAN communication module. Exemplarily, the external parallel signal is a parallel signal output by the external parallel device in the CAN communication bus.

[0029] As an example, in step S101, the control device can receive a parallel control signal transmitted by the CAN communication bus through the CAN communication module. The parallel control signal is used to control each power supply device in the parallel system to simultaneously perform the parallel task. Exemplarily, the parallel system also includes a main control module, which is connected to each power supply device through the CAN communication bus and is used to control the operation of the power supply device. Exemplarily, the parallel control signal can be configured and sent to the CAN communication bus through the main control module. After the power supply device on the CAN communication bus receives the parallel control signal, it can synchronously perform the parallel task.

[0030] As an example, in step S102, when the parallel control signal meets the parallel task triggering condition, the external parallel signal output by the CAN communication module is received. Exemplarily, the parallel control signal includes a pulse signal or a signal of a specific waveform. Optionally, the parallel task triggering condition is that the pulse signal is at a falling edge or a rising edge. Preferably, the parallel task triggering condition is that the pulse signal is at a falling edge, which can reduce false triggering caused by positive pulse noise. In this example, when the parallel control signal meets the parallel task triggering condition, the external parallel signal output by the CAN communication module is received, so as to synchronize the parallel task with the external parallel device.

[0031] As an example, as shown in FIG. X, the parallel system includes power supply device 1, power supply device 2 and power supply device 3. When the parallel control signal is at a falling edge, the control device in power supply device 1 receives the external parallel signal sent to the CAN communication bus by power supply device 2 and power supply device 3 through the CAN communication module. Similarly, the control device in power supply device 2 receives the external parallel signal sent to the CAN communication bus by power supply device 1 and power supply device 3 through the CAN communication module; the control device in power supply device 3 receives the external parallel signal sent to the CAN communication bus by power supply device 1 and power supply device 2 through the CAN communication module. When the parallel control signal is at a low level, a rising edge or a high level, the control device in power supply device 1, the control device in power supply device 2 and the control device in power supply device 3 are used to perform other tasks, such as collecting the device output signal at the output end of each parallel device, and outputting the device output signal to the CAN communication bus to form an external parallel signal.

[0032] As an example, in step S103, according to the external parallel signal, the output relay is controlled to be turned on, and the device output signal output from the output end of the parallel device is collected. Exemplarily, the external parallel signal includes a device synchronization signal sent by the external parallel device. Exemplarily, the device synchronization signal is used to instruct the control device to synchronously perform the parallel task. As an example, the device synchronization signal includes a relay line and signal sent by multiple external parallel devices. The relay line and signal are used to indicate whether the output relay of the external parallel device is turned on. In this example, when the relay line and signal sent by each external parallel device are 1, that is, the output relays in each external parallel device are turned on, the output relays are controlled to be turned on, thereby ensuring that the power supply device and the external parallel device are synchronously supplying power to the load. It can be understood that the relay line and signal sent by the external parallel device whose output relay is not turned on is 0.

[0033] As an example, in step S104, the DC component adjustment amount is determined according to the device output signal. Exemplarily, the control device determines the output voltage according to the device output signal, performs filtering on the output voltage, obtains the DC signal in the output voltage, and determines the DC component adjustment amount of the output voltage according to the DC signal. In this example, by determining the DC component adjustment amount, the output voltage is subsequently adjusted based on the DC component adjustment amount, and the DC circulating current in the parallel system is suppressed.

[0034] As an example, in step S105, the output voltage of the output terminal of the parallel device is adjusted according to the external parallel signal, the device output signal, and the DC component adjustment amount. Exemplarily, the external parallel signal includes a device output signal output by the external parallel device. Exemplarily, the device output signal includes output power. The control device adjusts the output voltage of the output terminal of the parallel device according to the output power corresponding to the external parallel device in the external parallel signal, the output power collected from the current power supply device where the control device is located, and the DC component adjustment amount, thereby adjusting the output voltage of the output terminal of the parallel device through the external parallel signal fed back by the external parallel device, the device output signal collected in real time, and the DC component adjustment amount determined according to the device output signal, so as to suppress the AC or DC circulating current of the parallel system.

[0035] In this embodiment, a parallel control signal is obtained. When the parallel control signal meets the parallel task triggering condition, the external parallel signal output by the CAN communication module is received, and the output relay is controlled to be turned on according to the external parallel signal, and the device output signal output from the output end of the parallel device is collected, so that the output relay is synchronously turned on by the external parallel signal output by the CAN communication module, saving the interface cost of sending the control signal for synchronously turning on the output relay; according to the device output signal, the DC component adjustment amount is determined, and according to the external parallel signal, the device output signal, and the DC component adjustment amount, the output voltage of the output end of the parallel device is adjusted, and the AC or DC circulation current of the parallel system is suppressed, so that the output voltage amplitude between the power supply devices in the parallel system can be quickly kept consistent.

[0036] In one embodiment, the external parallel signal includes relay lines and signals sent by multiple external parallel devices; according to the external parallel signal, controlling the output relay to be turned on includes: if the relay line and signal sent by each external parallel device is 1, controlling the output relay to be turned on. Figure 5 As shown, when the relay line and signal sent by power supply device 2 and power supply device 3 received by power supply device 1 are both 1, the output relay is controlled to be turned on, thereby realizing power supply to the load device synchronously with power supply device 2 and power supply device 3.

[0037] In one embodiment, if Figure 2 As shown, the device output signal includes an output voltage; according to the device output signal, determining the DC component adjustment amount includes: S201: If the preset device control mode is the DC voltage control mode, a DC voltage component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC voltage component.

[0038] S202: If the preset device control mode is the DC current control mode, a DC current component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC current component.

[0039] The control device includes a preset device control module, including a DC voltage control mode and a DC current control mode. The DC voltage control mode is used to suppress the DC voltage component. The DC current control mode is used to suppress the DC current component.

[0040] For example, for a parallel system, its output voltage satisfies U1dcv = U2dcv = U3dcv = ...Undcv = 0; its output current satisfies I1dci + I2dci + I3dci + ... + Indci = 0; therefore, for a parallel system with n (n≥2) power supply devices, by controlling the DC voltage component dcv of one power supply device to be 0, and the DC current component dci of (n-1) power supply devices to be 0, it is possible to ensure that the DC voltage component dcv and the DC current component dci of the entire parallel system are both 0, thereby suppressing the circulating current of the parallel system.

[0041] As an example, in step S201, if the preset device control mode is a DC voltage control mode, the DC voltage component is obtained according to the output voltage, and the DC component adjustment amount is obtained according to the DC voltage component. Exemplarily, the control device performs filtering processing on the output voltage to obtain the DC voltage component UDcv, inputs the preset voltage component threshold UDcvRef and the DC voltage component UDcv into the adder for calculation, processes the result output by the adder through the PI controller and the limiter, and outputs the DC voltage component adjustment amount, that is, the DC component adjustment amount, to suppress the DC voltage component in the parallel system. Figure 6 The power supply device 1 in the embodiment of the present invention. The proportional gain and integral gain of the PI controller and the limiter threshold of the limiter can be set according to actual experience and are not limited here.

[0042] As an example, in step S202, if the preset device control mode is a DC current control mode, the DC current component is obtained according to the output voltage, and the DC component adjustment amount is obtained according to the DC current component. Exemplarily, the control device performs filtering processing on the output voltage to obtain the DC current component, inputs the preset current component threshold UDcilef and the DC current component UDci into the adder for calculation, processes the result output by the adder through the PI controller and the limiter, and outputs the DC voltage component adjustment amount, that is, the DC component adjustment amount, to suppress the DC current component in the parallel system. Figure 6 The power supply device 2 or 3 in the PI controller. The proportional gain and integral gain of the PI controller, as well as the limiter threshold of the limiter can be set according to actual experience and are not limited here.

[0043] In this embodiment, if the preset device control mode is a DC voltage control mode, a DC voltage component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC voltage component; if the preset device control mode is a DC current control mode, a DC current component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC current component, thereby making some power supply devices in the parallel system operate in a DC voltage control mode and other power supply devices operate in a DC current control mode, thereby making the power supply devices in the DC voltage control mode have no requirements for DC current component sampling, and making the power supply devices in the DC current control mode have no requirements for DC voltage component sampling, thereby reducing the risk of abnormalities due to sampling errors, and at the same time saving a sampling signal for each power supply device, thereby saving costs.

[0044] In one embodiment, if Figure 3 As shown, the external parallel signal includes the external parallel power sent by multiple external parallel devices; the device output signal includes output power, output current, and output voltage phase angle; according to the external parallel signal, the device output signal, and the DC component adjustment amount, the output voltage at the output end of the parallel device is adjusted, including: S301: Determine a first power threshold and a first current threshold according to multiple external parallel machine powers and output voltage phase angles.

[0045] S302: Determine a first power adjustment amount according to a first power threshold, output power, and an output voltage phase angle.

[0046] S303: Determine a first current adjustment amount according to the first current threshold and the output current.

[0047] S304: Adjust the output voltage of the output terminal of the parallel device according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount.

[0048] The control device performs analog-to-digital conversion on the output voltage to obtain a digital signal corresponding to the output voltage, and then performs filtering, Fourier transformation and phase angle conversion to obtain the output voltage phase angle.

[0049] As an example, in step S301, a first power threshold and a first current threshold are determined according to a plurality of external parallel powers and an output voltage phase angle. Exemplarily, an average parallel power is obtained according to a plurality of external parallel powers, that is, the plurality of external parallel powers are summed and averaged to obtain the average parallel power, and the average parallel power is determined as the first power threshold Pref. An average parallel current is determined according to the average parallel power and the output voltage. A first current threshold is determined according to the average parallel current and the output voltage phase angle. Exemplarily, as Figure 7As shown, assuming that the average parallel current is Iref and the output voltage phase angle is θ, the first current threshold is Iref*sin(θ).

[0050] As an example, in step S302, if Figure 7 As shown, the first power adjustment amount is determined according to the first power threshold, the output power and the output voltage phase angle. As an example, the first power threshold Pref and the output power P are input into the adder, the power error value is output, the power error value is input into the PI controller, the power control parameter is output through the PI controller and the limiter, and the first power adjustment amount is determined according to the power control parameter and the output voltage phase angle. Exemplarily, the first power adjustment amount is the power control parameter *sin(θ). The proportional gain and integral gain of the PI controller, and the limiter threshold of the limiter can be set according to actual experience, and are not limited here.

[0051] As an example, in step S303, the first current adjustment amount is determined according to the first current threshold and the output current. As an example, the first current threshold Iref*sin(θ) and the output current Ivar are input into an adder, a current error value is output, and the current error value is input into a PI controller, and the first current adjustment amount is determined through the PI controller and the limiter. The proportional gain and integral gain of the PI controller, and the limiter threshold of the limiter can be set according to actual experience, and are not limited here.

[0052] As an example, in step S304, the output voltage of the output terminal of the parallel device is adjusted according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount. The preset voltage threshold is a threshold set by a user. In this example, the control device adjusts the output voltage of the output terminal of the parallel device according to the preset voltage adjustment strategy, based on the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount, thereby adjusting the output voltage of the power supply device in combination with the power, current and DC component.

[0053] In this embodiment, a first power threshold and a first current threshold are determined according to multiple external parallel powers and output voltage phase angles, a first power adjustment amount is determined according to the first power threshold, output power and output voltage phase angle, a first current adjustment amount is determined according to the first current threshold and the output current, and the output voltage at the output end of the parallel device is adjusted according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount. At the same time, power, current and DC component control are introduced to increase the response speed of output voltage control.

[0054] In one embodiment, if Figure 4As shown, adjusting the output voltage of the output terminal of the parallel device according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount includes: S401: superimpose a preset voltage threshold, a first power adjustment amount, a first current adjustment amount, and a DC component adjustment amount, and output a first adjustment signal.

[0055] S402: Perform single-machine off-grid adjustment on the first adjustment signal and output a second adjustment signal.

[0056] S403: superimpose the second adjustment signal and the first current adjustment amount, and output a voltage adjustment signal, so as to adjust the output voltage of the output terminal of the parallel device through the voltage adjustment signal.

[0057] As an example, in step S401, if Figure 7 As shown, the control device superimposes the preset voltage threshold Uref, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount through an adder, and outputs a first adjustment signal to introduce power and current control. Figure 7 As shown, the DC component adjustment amount is output by the DCV / DCI controller in the control device switching the DC voltage control mode or the DC current control mode. Referring to step S201 to step S202 in the above embodiment, no further details are given here.

[0058] As an example, in step S402, a single-machine off-grid adjustment is performed on the first adjustment signal, and a second adjustment signal is output. Exemplarily, the control device includes a single-machine off-grid controller, and the single-machine off-grid controller performs a single-machine off-grid adjustment on the first adjustment signal, and outputs the second adjustment signal. The single-machine off-grid adjustment is to repeat PI control on the first adjustment signal alone, and output the second adjustment signal.

[0059] As an example, in step S403, the second adjustment signal and the first current adjustment amount are superimposed to output a voltage adjustment signal, so as to adjust the output voltage of the output terminal of the parallel device through the voltage adjustment signal.

[0060] In this example, a preset voltage threshold, a first power adjustment amount, a first current adjustment amount and a DC component adjustment amount are superimposed, a first adjustment signal is output, a single-machine off-grid adjustment is performed on the first adjustment signal, a second adjustment signal is output, the second adjustment signal and the first current adjustment amount are superimposed, and a voltage adjustment signal is output to adjust the output voltage of the output end of the parallel device through the voltage adjustment signal. By combining the second adjustment signal after the single-machine off-grid adjustment and the first current adjustment amount, a voltage adjustment signal, such as a PWM signal, is output, which can increase the response speed of the output voltage control.

[0061] This embodiment provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned parallel device control method is implemented.

[0062] This embodiment provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned parallel device control method is implemented.

[0063] The present embodiment provides a power supply device, including a power supply input terminal, a CAN communication module, an output relay, a parallel device output terminal and the above-mentioned control device; the power supply input terminal is used to connect a power supply; the CAN communication module is used to connect an external parallel device and to transmit an external parallel signal output by the external parallel device; the output relay is arranged between the power supply input terminal and the parallel device output terminal; the control device is connected to the CAN communication module, the output relay and the parallel device output terminal.

[0064] This embodiment provides a parallel system, including multiple power supply devices as described above, wherein the CAN communication modules in each power supply device are connected via a CAN communication bus; the output terminals of the parallel devices of each power supply device are connected in common for connecting a load device.

[0065] For example, Figure 8 As shown, the parallel system includes parallel structures of power supply devices 1, 2 and 3 which are respectively connected in parallel through a communication bus, and connected to the load device through an output interface connected to the output bus.

[0066] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A parallel equipment control method, characterized in that: include: Get parallel control signal; When the parallel control signal meets the parallel task triggering condition, an external parallel signal output by receiving the CAN communication module; According to the external parallel signal, the output relay is controlled to be turned on, and the device output signal output from the output terminal of the parallel device is collected; Determining a DC component adjustment amount according to an output signal of the device; The output voltage of the output terminal of the parallel device is adjusted according to the external parallel signal, the device output signal, and the DC component adjustment amount.

2. The parallel equipment control method according to claim 1, characterized in that: The parallel control signal includes a pulse signal; and the parallel task triggering condition is that the pulse signal is at a falling edge.

3. The parallel equipment control method according to claim 1, characterized in that: The external parallel signal includes relay lines and signals sent by multiple external parallel devices; The step of controlling the output relay to be turned on according to the external parallel signal comprises: If the relay line and signal sent by each of the external parallel devices are both 1, the output relay is controlled to be turned on.

4. The parallel equipment control method according to claim 1, characterized in that: The device output signal includes an output voltage; Determining the DC component adjustment amount according to the device output signal includes: If the preset device control mode is a DC voltage control mode, a DC voltage component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC voltage component; If the preset device control mode is a DC current control mode, a DC current component is obtained according to the output voltage, and a DC component adjustment amount is obtained according to the DC current component.

5. The parallel equipment control method according to claim 1, characterized in that: The external parallel signal includes the external parallel power sent by multiple external parallel devices; the device output signal includes output power, output current, and output voltage phase angle; The step of adjusting the output voltage of the output terminal of the parallel device according to the external parallel signal, the device output signal, and the DC component adjustment amount includes: Determine a first power threshold and a first current threshold according to the plurality of external parallel machine powers and the output voltage phase angle; determining a first power adjustment amount according to the first power threshold, the output power and the output voltage phase angle; determining a first current adjustment amount according to the first current threshold and the output current; The output voltage of the output terminal of the parallel device is adjusted according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount.

6. The parallel equipment control method according to claim 5, characterized in that: The step of adjusting the output voltage of the output terminal of the parallel device according to the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount comprises: superimposing the preset voltage threshold, the first power adjustment amount, the first current adjustment amount and the DC component adjustment amount, and outputting a first adjustment signal; Performing single-machine off-grid adjustment on the first adjustment signal, and outputting a second adjustment signal; The second adjustment signal and the first current adjustment amount are superimposed to output a voltage adjustment signal, so as to adjust the output voltage of the output end of the parallel device through the voltage adjustment signal.

7. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the parallel device control method according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the parallel device control method according to any one of claims 1 to 6 is implemented.

9. A power supply device, characterized in that: It comprises a power supply input terminal, a CAN communication module, an output relay, a parallel device output terminal and a control device as claimed in claim 7; The power supply input terminal is used to connect to a power supply; The CAN communication module is used to connect to an external parallel device and to transmit an external parallel signal output by the external parallel device; The output relay is arranged between the power supply input terminal and the parallel device output terminal; The control device is connected to the CAN communication module, the output relay and the output end of the parallel device.

10. A parallel system, characterized in that: Comprising a plurality of power supply devices as claimed in claim 9, wherein the CAN communication modules in each of the power supply devices are connected via a CAN communication bus; The parallel device output terminals of each of the power supply devices are connected in common for connecting to a load device.

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