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CN114696586B - Inverter control method, device and system - Google Patents

Inverter control method, device and system Download PDF

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Publication number
CN114696586B
CN114696586B CN202011562918.7A CN202011562918A CN114696586B CN 114696586 B CN114696586 B CN 114696586B CN 202011562918 A CN202011562918 A CN 202011562918A CN 114696586 B CN114696586 B CN 114696586B
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China
Prior art keywords
voltage
inverter
target
output
current
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CN202011562918.7A
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CN114696586A (en
Inventor
尹韶文
尹雪芹
尹继波
傅梦体
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BYD Co Ltd
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BYD Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5375—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with special starting equipment

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to an inverter control method, a device and a system, which are applied to the technical field of inverter control, wherein the method comprises the steps of obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of a current inverter, determining a first target given voltage at the current moment according to the target voltage, a history given voltage and a preset step voltage, adjusting the output voltage of the inverter according to the first target given voltage, the first output current and the first target given voltage, judging whether the difference value between the adjusted output voltage and the target voltage of the inverter is not more than a first preset voltage difference value, if yes, controlling the inverter to finish starting, otherwise, repeatedly executing the steps until the difference value between the adjusted output voltage and the target voltage is not more than the first preset voltage difference value, and controlling the inverter to finish starting.

Description

Inverter control method, device and system
Technical Field
The disclosure relates to the technical field of inverter control, and in particular relates to an inverter control method, device and system.
Background
With the development of energy storage systems based on distributed power generation technology, the energy storage systems can be operated in a grid-connected mode so as to facilitate frequency modulation and peak shaving of a power supply system, and can also be operated in an off-grid mode (i.e. island mode), and an inverter in the energy storage systems is used for supplying power to a load, wherein the inverter is used for converting direct-current electric energy (batteries and storage batteries) into alternating-current electric energy. Currently, as energy demand increases, a single inverter has failed to meet the power demand of a load, and multiple inverters are required to jointly supply power to the load in a parallel manner. However, when a plurality of inverters connected in parallel are started, each inverter generates a large impact current, which impacts a load and may damage the inverter, thereby affecting the service life of the inverter.
Disclosure of Invention
In order to solve the problems in the related art, the present disclosure provides an inverter control method, apparatus, and system.
To achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided an inverter control method including:
step one, obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of the inverter at present;
Step two, according to the target voltage, historical given voltage and preset step voltage, determining a first target given voltage at the current moment, wherein the historical given voltage is the first target given voltage at the previous moment;
Step three, adjusting the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage;
Step four, judging whether the difference value between the regulated output voltage of the inverter and the target voltage is not larger than a first preset voltage difference value,
If yes, the inverter is controlled to finish starting,
And if not, repeating the steps one to four until the difference between the regulated output voltage of the inverter and the target voltage is not greater than the first preset voltage difference value so as to control the inverter to finish starting.
Optionally, the determining the first target given voltage at the current moment according to the target voltage, the historical given voltage and the preset step voltage includes:
when the target voltage is greater than the history given voltage and a difference between the target voltage and the history given voltage is greater than or equal to the step voltage, taking a sum of the history given voltage and the step voltage as the first target given voltage;
Taking the target voltage as the first target given voltage when the target voltage is greater than the history given voltage and a difference between the target voltage and the history given voltage is less than the step voltage;
When the target voltage is less than or equal to the history given voltage and a difference between the history given voltage and the target voltage is greater than or equal to the step voltage, a difference between the history given voltage and the step voltage is taken as the first target given voltage;
The target voltage is taken as the first target given voltage in a case where the target voltage is less than or equal to the history given voltage and a difference between the history given voltage and the target voltage is less than the step-size voltage.
Optionally, the adjusting the output voltage of the inverter according to the first output voltage, the first output current, and the first target given voltage includes:
determining a first target current according to the first target given voltage and the first output voltage, and determining a first reference voltage according to the first target current and the first output current;
And adjusting the output voltage of the inverter according to the first reference voltage.
Optionally, the determining the first target current according to the first target given voltage and the first output voltage, and determining the first reference voltage according to the first target current and the first output current includes:
proportional integral adjustment is carried out on the difference between the first target given voltage and the first output voltage so as to obtain the first target current;
Proportional integral adjustment is carried out on the difference between the first target current and the first output current so as to obtain a first voltage;
Feedforward decoupling is carried out on the first output current so as to obtain a second voltage;
The first reference voltage is determined from the first voltage and the second voltage.
Optionally, the inverters have a plurality, each of the inverters is in communication with each other, and after all of the inverters are started, the method further includes:
Acquiring active power and reactive power output by each inverter;
determining average active power according to the active power output by each inverter, and determining average reactive power according to the reactive power output by each inverter;
acquiring a second output voltage and a second output current of the current inverter;
And adjusting the output voltage of the inverter according to the target voltage, the second output current, the average active power and the average reactive power so that the output voltage difference among a plurality of inverters is not larger than a second preset voltage difference.
Optionally, the adjusting the output voltage of the inverter according to the target voltage, the second output current, the average active power and the average reactive power includes:
Determining a second target given voltage according to the active power, the reactive power, the average active power, the average reactive power and the target voltage output by the inverter;
Determining a second target current according to the second target given voltage and the second output voltage, and determining a second reference voltage according to the second target current and the second output current;
And adjusting the output voltage of the inverter according to the second reference voltage.
Optionally, the determining a second target current according to the second target given voltage and the second output voltage, and determining a second reference voltage according to the second target current and the second output current includes:
Proportional integral adjustment is carried out on the difference between the second target given voltage and the second output voltage so as to obtain the second target current;
Proportional integral adjustment is carried out on the difference between the second target current and the second output current so as to obtain a third voltage;
feedforward decoupling is carried out on the second output current so as to obtain a fourth voltage;
And determining the second reference voltage according to the third voltage and the fourth voltage.
Optionally, before the acquiring the active power and the reactive power output by each inverter, the method further includes:
Acquiring an operation state of each inverter, wherein the operation state comprises a normal state or an abnormal state;
determining a main inverter among a plurality of the inverters according to the operation state;
and synchronizing the frequency and the phase of the output voltage of the slave inverter according to a synchronization signal generated by the master inverter, wherein the synchronization signal comprises the frequency and the phase of the output voltage of the master inverter, and the slave inverter is any inverter except the master inverter.
According to a second aspect of the embodiments of the present disclosure, there is provided an inverter control device including:
A memory;
a processor for performing the steps of the inverter control method provided in the first aspect.
According to a third aspect of the embodiments of the present disclosure, there is provided an inverter control system including:
A plurality of inverter modules, wherein a plurality of inverter modules are connected and communicated with each other, and each inverter module comprises an inverter;
an inverter control device according to a second aspect, the inverter control device being connected to a plurality of the inverter modules;
and the plurality of inverter modules are respectively connected with the load.
According to the technical scheme, the method comprises the steps of obtaining the target voltage corresponding to the inverter, the first output voltage and the first output current of the current inverter, determining the first target given voltage at the current moment according to the target voltage, the historical given voltage and the preset step voltage, wherein the historical given voltage is the first target given voltage at the previous moment, adjusting the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage, judging whether the difference value between the adjusted output voltage of the inverter and the target voltage is not greater than a first preset voltage difference value, if yes, controlling the inverter to finish starting, if not, repeatedly executing the steps until the difference value between the adjusted output voltage of the inverter and the target voltage is not greater than the first preset voltage difference value, and controlling the inverter to finish starting. According to the method and the device, the first target given voltage is adjusted for multiple times through the step voltage, and the output voltage of the inverter is adjusted through the adjusted first target given voltage, so that the output voltage of the inverter can be smoothly transited to the target voltage, the impact current generated by starting the inverter is reduced, the impact on a load is small, the inverter can be prevented from being damaged, and the service life of the inverter is prolonged.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flowchart illustrating an inverter control method according to an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a control flow for inverter startup according to an exemplary embodiment;
FIG. 3 is a flowchart illustrating another inverter control method according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating a control flow after completion of an inverter startup according to an exemplary embodiment;
fig. 5 is a flowchart illustrating yet another inverter control method according to an exemplary embodiment;
fig. 6 is a block diagram of an inverter control device according to an exemplary embodiment;
FIG. 7 is a block diagram of an inverter control system shown in accordance with an exemplary embodiment;
fig. 8 is a block diagram illustrating an inverter control module according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
Fig. 1 is a flowchart illustrating an inverter control method according to an exemplary embodiment. As shown in fig. 1 (steps 101-104 represent steps one through four, respectively), the method may include the steps of:
step 101, obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of a current inverter.
For example, in order to reduce the rush current generated when starting the inverter, a method of smoothly adjusting the output voltage of the inverter may be used to ensure that the output voltage of the inverter does not suddenly increase or decrease during the starting process, so that the output voltage of the inverter linearly and smoothly transits from zero to the voltage value required by the load, thereby reducing the rush current generated when starting the inverter.
Specifically, first, a target voltage corresponding to the inverter, and a first output voltage and a first output current of the current inverter may be obtained. The target voltage may be preset, or may be set by the user by sending a corresponding instruction. The target voltage may be understood as a voltage required by the inverter to be supplied to the load, and may include a direct-axis target voltage, which is a voltage on the d-axis (i.e., the direct axis) of the dq0 rotational coordinate system, and an quadrature-axis target voltage, which is a voltage on the q-axis (i.e., the quadrature axis) of the dq0 rotational coordinate system. The first output voltage is the output voltage of the inverter acquired in real time in the starting process of the inverter, and the first output current is the output current of the inverter acquired in real time in the starting process of the inverter.
Step 102, determining a first target given voltage at the current moment according to the target voltage, the historical given voltage and the preset step voltage, wherein the historical given voltage is the first target given voltage at the previous moment.
Further, in order that the output voltage of the inverter may be smoothly transitioned to the target voltage, a smoothing given method may be employed, different first target given voltages may be set at different times in time series (for example, different first target given voltages may be set at 0s, 2s, 4s,..10 s, respectively), and the inverter may be caused to adjust the output voltage of the inverter in accordance with the first target given voltages set each time. Each moment corresponds to a first target given voltage, and the first target given voltage is a voltage value to which the output voltage of the inverter is to be regulated in a period of time before the moment to the next moment. By setting different first target given voltages at different moments, the output voltage of the inverter is regulated to the target voltage at one time, which is equivalent to the requirement of the original regulation, and the regulation is divided into a plurality of stepped regulation stages, wherein each regulation stage corresponds to one moment, and each regulation stage comprises a time period from the moment corresponding to the regulation stage to the moment corresponding to the next regulation stage. The first target given voltage includes a first direct-axis given voltage that is a voltage on the d-axis and a first quadrature-axis given voltage that is a voltage on the q-axis. For example, the first target given voltage at the current time may be determined according to the target voltage, the historical given voltage, and the preset step voltage. The current time is the time corresponding to the current regulation stage of the inverter.
Specifically, after the target voltage is obtained, when the target voltage is greater than the history given voltage and the difference between the target voltage and the history given voltage is greater than or equal to the step voltage, the sum of the history given voltage and the step voltage may be used as the first target given voltage. Taking the moment of setting the first target given voltage as 0s, 2s and 4s, the target voltage as 60V and the step voltage as 20V as an example, if the current moment is 0s and no history given voltage exists at the moment, the history given voltage is set as 0, the difference between the target voltage and the history given voltage is 60-0=60V >20V, and the first target given voltage corresponding to 0s is determined to be 0+20V=20V. If the current time is 2s and the historical given voltage at the moment is the first target given voltage corresponding to 0s, the historical given voltage is set to be 20V, the difference between the target voltage and the historical given voltage is 60-20=40V >20V, and the first target given voltage corresponding to 2s is 20+20V=40V.
Or the target voltage may be regarded as the first target given voltage in the case where the target voltage is greater than the history given voltage and the difference between the target voltage and the history given voltage is smaller than the step-size voltage. Alternatively, the difference between the history given voltage and the step voltage may be regarded as the first target given voltage in the case where the target voltage is less than or equal to the history given voltage and the difference between the history given voltage and the target voltage is greater than or equal to the step voltage. Or the target voltage may be regarded as the first target given voltage in the case where the target voltage is less than or equal to the history given voltage and the difference between the history given voltage and the target voltage is less than the step voltage.
Step 103, adjusting the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage.
For example, the first target current may be determined based on the first target given voltage and the first output voltage, and the first reference voltage may be determined based on the first target current and the first output current. For example, the difference between the first target given voltage and the first output voltage may be used as an input of a voltage PI (english: proportional Iintegral, chinese: proportional integral) regulator, and then the difference between the output of the voltage PI regulator and the first output current may be used as an input of a current PI regulator, and according to the output of the current PI regulator, the first reference voltage may be obtained by combining inductive feedforward decoupling.
The output voltage of the inverter may then be adjusted based on the first reference voltage. For example, the first reference voltage may be PWM-modulated to obtain a driving signal corresponding to the first reference voltage, and the output voltage of the inverter may be adjusted according to the driving signal.
Step 104, judging whether the difference between the regulated output voltage of the inverter and the target voltage is not greater than a first preset voltage difference.
If yes, the inverter is controlled to finish starting.
If not, repeating the steps until the difference between the regulated output voltage of the inverter and the target voltage is not greater than the first preset voltage difference, so as to control the inverter to finish starting.
For example, after the output voltage of the inverter is adjusted, it may be determined whether the difference between the adjusted output voltage of the inverter and the target voltage is not greater than a first preset voltage difference. And if the difference between the regulated output voltage of the inverter and the target voltage is not greater than a first preset voltage difference (for example, 10V), controlling the inverter to finish starting. If the difference between the regulated output voltage of the inverter and the target voltage is greater than the first preset voltage difference, which indicates that the current regulation of the output voltage of the inverter does not meet the starting requirement of the inverter, the steps can be repeatedly executed to regulate the output voltage of the inverter again until the difference between the output voltage of the inverter and the target voltage is not greater than the first preset voltage difference, so as to complete the starting of the inverter.
In summary, the present disclosure determines a first target given voltage at a current time according to a target voltage, a history given voltage and a preset step voltage by obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of the current inverter, where the history given voltage is the first target given voltage at a previous time, then adjusts the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage, determines whether a difference value between the adjusted output voltage and the target voltage of the inverter is not greater than a first preset voltage difference value, if yes, controls the inverter to complete starting, if no, repeatedly performs the steps until the difference value between the adjusted output voltage and the target voltage of the inverter is not greater than the first preset voltage difference value, so as to control the inverter to complete starting. According to the method and the device, the first target given voltage is adjusted for multiple times through the step voltage, and the output voltage of the inverter is adjusted through the adjusted first target given voltage, so that the output voltage of the inverter can be smoothly transited to the target voltage, the impact current generated by starting the inverter is reduced, the impact on a load is small, the inverter can be prevented from being damaged, and the service life of the inverter is prolonged.
Alternatively, determining the first target current based on the first target given voltage and the first output voltage, and determining the first reference voltage based on the first target current and the first output current may be achieved by:
and A), carrying out proportional integral regulation on the difference between the first target given voltage and the first output voltage to obtain a first target current.
And B), carrying out proportional integral regulation on the difference between the first target current and the first output current to obtain a first voltage.
And C), feedforward decoupling is carried out on the first output current so as to obtain a second voltage.
And D), determining a first reference voltage according to the first voltage and the second voltage.
For example, the first output voltage and the first output current are both three-phase symmetric sinusoids in the abc coordinate system. The control flow diagram for starting the inverter may be as shown in fig. 2, where the first output voltage may be transformed by park transformation (abc/dq in fig. 2) to obtain a first direct-axis output voltage Ud1 of the first output voltage on the d-axis and a first quadrature-axis output voltage Uq1 of the first output voltage on the q-axis, and the first output current may be transformed by park transformation to obtain a first direct-axis output current Id1 of the first output current on the d-axis and a first quadrature-axis output current Iq1 of the first output current on the q-axis.
The difference between Ud1_obj (Ud1_obj being the first direct current given voltage) and Ud1 may then be fed into a first outer loop PI regulator for proportional integral regulation to obtain a first direct current given Id1_obj comprised by the first target current. Meanwhile, the difference between Uq_obj (Uq1_obj is the first quadrature axis given voltage) and Uq1 is sent to a second outer loop PI regulator to be subjected to proportional integral regulation, so that the first quadrature axis given current Iq1_obj contained in the first target current is obtained. The difference between Id1_obj and Id1 may then be fed into a first inner loop PI regulator for proportional integral regulation to obtain a first direct voltage U'd1 comprised by the first voltage. Meanwhile, the difference between Iq1_obj and Iq1 is sent to a second inner ring PI regulator to carry out proportional integral regulation so as to obtain a first quadrature axis voltage U' q1 included in the first voltage. In addition, id1 and Iq1 may be separately inductively feedforward decoupled (i.e., feedforward decoupled by wL in fig. 2) to obtain a second voltage, which includes a second direct-axis voltage U'd2 and a second quadrature-axis voltage U' q2. Finally, a first reference voltage may be determined from the first voltage and the second voltage. Wherein the first reference voltage comprises a first direct reference voltage Ud1_ref and a first quadrature reference voltage Uq1_ref, ud1_ref=u 'd1+Ud2, d1+U the position of the'd 2. After determining the first reference voltage, the first reference voltage may be inverse park-converted (i.e., dq/abc in fig. 2), PWM-modulated, and the inverter driven according to the resulting PWM signal.
Fig. 3 is a flowchart illustrating another inverter control method according to an exemplary embodiment. As shown in fig. 3, the inverter has a plurality of inverters, each of which communicates with each other, and after all of the inverters are started, the method further includes the steps of:
step 105, obtaining the active power and reactive power output by each inverter.
And 106, determining average active power according to the active power output by each inverter, and determining average reactive power according to the reactive power output by each inverter.
In another scenario, after the start-up of each inverter is completed, in order to reduce the circulation between the inverters, the active power (P1, P2,..once, pn) and the reactive power (Q1, Q2,..once, qn) output by each inverter may be obtained, where n is the number of inverters. The average active power p_avg of all the inverters may then be determined from the active power output by each inverter, while the average reactive power q_avg of all the inverters may be determined from the reactive power output by each inverter. Wherein, p_avg= (p1+p2) +Pn)/n, q_avg= q1+q2 +qn)/n.
Step 107, obtaining a second output voltage and a second output current of the current inverter.
And step 108, adjusting the output voltages of the inverters according to the target voltage, the second output current, the average active power and the average reactive power so that the output voltage difference value among the plurality of inverters is not larger than a second preset voltage difference value.
For example, after each inverter startup is completed, the second output voltage and the second output current of each inverter may be obtained. The second target given voltage may then be determined based on the active power, reactive power, average active power, average reactive power, and target voltage output by the inverter. And determining a second target current according to the second target given voltage and the second output voltage, and determining a second reference voltage according to the second target current and the second output current. And finally, regulating the output voltage of the inverter according to the second reference voltage.
Specifically, for each inverter, the second target given voltage of the inverter may be determined according to the active power Pi, the reactive power Qi, the average active power p_avg, the average reactive power q_avg, and the target voltage output by the inverter. For example, the difference between Pi and p_avg may be fed into a first power Pi regulator to obtain the direct axis correction voltage Δud. At the same time, the difference of Qi and q_avg may be fed into the second power PI regulator to obtain the quadrature axis correction voltage Δuq. The second target given voltage may then be determined from Δud, Δuq and the target voltage. Wherein the second target given voltage comprises a second direct-axis given voltage ud2_obj and a second quadrature-axis given voltage uq2_obj, ud2_obj=Δud+ud0, uq2_obj=Δuq+uq0, ud0 being the direct-axis target voltage and Uq0 being the quadrature-axis target voltage. Then, a second target current of the inverter may be determined based on the second target given voltage and the second output voltage of the inverter, and a second reference voltage of the inverter may be determined based on the second target current and the second output current of the inverter. Finally, the output voltage of the inverter may be adjusted according to the second reference voltage of the inverter, so that the output voltage difference between the plurality of inverters is not greater than a second preset voltage difference, and the second preset voltage difference may be, for example, 1V.
Alternatively, determining the second target current based on the second target given voltage and the second output voltage, and determining the second reference voltage based on the second target current and the second output current may be achieved by:
and a step a), carrying out proportional integral adjustment on the difference between the second target given voltage and the second output voltage to obtain a second target current.
And b), carrying out proportional integral regulation on the difference between the second target current and the second output current to obtain a third voltage.
And c), feedforward decoupling is carried out on the second output current so as to obtain a fourth voltage.
And d), determining a second reference voltage according to the third voltage and the fourth voltage.
For example, as shown in fig. 4, the control flow diagram after the start-up of the inverter may be shown, the second output voltage may be transformed by park transformation to obtain a second direct-axis output voltage Ud2 of the second output voltage on the d-axis and a second quadrature-axis output voltage Uq2 of the second output voltage on the q-axis, and the second output current may be transformed by park transformation to obtain a second direct-axis output current Id2 of the second output current on the d-axis and a second quadrature-axis output current Iq2 of the first output current on the q-axis.
The difference between Ud2 obj and Ud2 may then be fed into a first outer loop PI regulator for proportional integral adjustment to obtain a second direct axis given current Id2 obj comprised by the second target current. And simultaneously, sending the difference between Uq2_obj and Uq2 into a second outer loop PI regulator for proportional integral regulation to obtain a second quadrature axis given current Iq2_obj included in the second target current. The difference between Id2_obj and Id2 may then be sent to a first inner loop PI regulator for proportional integral adjustment to obtain a third direct axis voltage U'd3 comprised by the third voltage. And simultaneously, sending the difference between Iq2_obj and Iq2 into a second inner ring PI regulator to perform proportional integral regulation so as to obtain a third quadrature axis voltage U' q3 included in the third voltage. In addition, the inductance feedforward decoupling can be performed on Id2 and Iq2 respectively to obtain a fourth voltage, where the fourth voltage includes a fourth direct-axis voltage U'd4 and a fourth quadrature-axis voltage U' q4. Finally, the second reference voltage may be determined from the third voltage and the fourth voltage. Wherein the second reference voltage comprises a second direct-axis reference voltage Ud2_ref and a second quadrature-axis reference voltage Uq2_ref, ud2_ref=u 'd3+Ud4, d3+U the position of the'd 4. After the second reference voltage is determined, the first reference voltage may be inverse-transformed by park, PWM-modulated, and the inverter driven according to the obtained PWM signal.
Fig. 5 is a flowchart illustrating yet another inverter control method according to an exemplary embodiment. As shown in fig. 5, prior to step 105, the method may further include:
Step 109, obtaining an operation state of each inverter, wherein the operation state comprises a normal state or an abnormal state.
Step 110, determining a main inverter among a plurality of inverters according to the operation state.
In one scenario, the operating states of the individual inverters may be acquired in real time. The running state comprises a normal state or an abnormal state, and the normal state is used for representing that the inverter has no fault and can work normally. The abnormal state is used for representing that the inverter has a fault and can not work normally.
Then, one inverter may be selected as a master inverter from among the inverters whose operation states are normal, and the other inverters may be selected as slave inverters. Furthermore, the main inverter is not fixed on one inverter, once the main inverter fails, the control module can select one inverter from the inverters with normal running states as the main inverter, and in such a way, the redundancy can be increased, so that the reliability of synchronization is ensured.
Step 111, synchronizing the frequency and phase of the output voltage of the slave inverter according to the synchronization signal generated by the master inverter, wherein the synchronization signal includes the frequency and phase of the output voltage of the master inverter, and the slave inverter is any inverter except the master inverter.
In particular, the main inverter may periodically generate a synchronization signal comprising the frequency and phase of the output voltage of the main inverter, which may be, for example, a square wave signal. The frequency and phase of the output voltage of each slave inverter may then be synchronized according to the frequency and phase of the output voltage included in the synchronization signal such that the frequency and phase of the output voltage of each slave inverter is synchronized with the frequency and phase of the output voltage of the master inverter.
In summary, the present disclosure determines a first target given voltage at a current time according to a target voltage, a history given voltage and a preset step voltage by obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of the current inverter, where the history given voltage is the first target given voltage at a previous time, then adjusts the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage, determines whether a difference value between the adjusted output voltage and the target voltage of the inverter is not greater than a first preset voltage difference value, if yes, controls the inverter to complete starting, if no, repeatedly performs the steps until the difference value between the adjusted output voltage and the target voltage of the inverter is not greater than the first preset voltage difference value, so as to control the inverter to complete starting. According to the method and the device, the first target given voltage is adjusted for multiple times through the step voltage, and the output voltage of the inverter is adjusted through the adjusted first target given voltage, so that the output voltage of the inverter can be smoothly transited to the target voltage, the impact current generated by starting the inverter is reduced, the impact on a load is small, the inverter can be prevented from being damaged, and the service life of the inverter is prolonged.
Fig. 6 is a block diagram illustrating an inverter control device according to an exemplary embodiment. As shown in fig. 6, the inverter control device 200 includes:
A memory 201.
Processor 202, processor 202 is configured for any of the inverter control methods described above.
With respect to the inverter control device 200 in the above-described embodiment, the specific manner in which the processor 202 performs the operation has been described in detail in the embodiment regarding the method, and will not be explained in detail here.
The present disclosure also relates to an inverter control system, as shown in fig. 7 (fig. 7 illustrates an example of 4 inverter modules 301), where the system 300 includes a plurality of inverter modules 301, the inverter control device 200, and a load 302.
The inverter control device 200 is connected to the plurality of inverter modules 301, and the plurality of inverter modules 301 are connected to the load 302. The load 302 may be, for example, a battery, an energy storage system, a motor, various types of powered devices, and the like.
It should be noted that, in fig. 7, the plurality of inverter modules 301 are connected to each other by a synchronization optical fiber for communication, and the inverter control device 200 is connected to the plurality of inverter modules 301 by a communication bus, which is merely an illustration of the inverter control system 300, and the specific connection manner of the inverter control system 300 is not limited in this disclosure.
Further, as shown in fig. 8, the inverter module 301 may include a battery 3011, an inverter 3012, a filter 3013, a sampling circuit 3014, and a controller 3015. The battery 3011 is connected to the dc side of the inverter 3012 as a dc power source of the inverter module 301, and supplies dc power to the inverter 3012. The ac side of the inverter 3012 is connected to the input side of the filter 3013, the output side of the filter 3013 is connected to the load 302, the inverter 3012 may include high-power electronic devices such as IGBTs (english: insulated Gate Bipolar Transistor, chinese: insulated gate bipolar transistors) and ac-dc conversion circuits, and the filter 3013 is used to filter the ac output of the inverter 3012 for EMC (english: electromagnetic Compatibility, chinese: electromagnetic compatibility) filtering to filter harmonic components in the ac output of the inverter 3012. The sampling circuit 3014 may include a current detection circuit for detecting an output current of the inverter 3012, and a voltage detection circuit for detecting an output voltage of the filter 3013 (i.e., an output voltage of the inverter 3012), and the sampling circuit 3014 is connected to the controller 3015. The controller 3015 is connected to a control terminal of the inverter 3012, and is configured to generate a PWM (english: pulse width modulation, chinese: pulse width modulation) signal to regulate an output of the inverter 3012 according to the PWM signal. The controller 3015 may be a high-performance real-time signal processor such as DSP (english: DIGITAL SIGNAL Process, chinese: digital signal processing), FPGA (english: field Programmable GATE ARRAY, chinese: field programmable gate array foreign language name), or the like.
The control process for starting the inverter 3012 and the control process after the completion of the starting of the inverter 3012 may be implemented by the inverter control device 200, by the controller 3015, or by both the inverter control device 200 and the controller 3015.
In summary, the present disclosure determines a first target given voltage at a current time according to a target voltage, a history given voltage and a preset step voltage by obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of the current inverter, where the history given voltage is the first target given voltage at a previous time, then adjusts the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage, determines whether a difference value between the adjusted output voltage and the target voltage of the inverter is not greater than a first preset voltage difference value, if yes, controls the inverter to complete starting, if no, repeatedly performs the steps until the difference value between the adjusted output voltage and the target voltage of the inverter is not greater than the first preset voltage difference value, so as to control the inverter to complete starting. According to the method and the device, the first target given voltage is adjusted for multiple times through the step voltage, and the output voltage of the inverter is adjusted through the adjusted first target given voltage, so that the output voltage of the inverter can be smoothly transited to the target voltage, the impact current generated by starting the inverter is reduced, the impact on a load is small, the inverter can be prevented from being damaged, and the service life of the inverter is prolonged.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (9)

1. An inverter control method, characterized by comprising:
step one, obtaining a target voltage corresponding to an inverter, and a first output voltage and a first output current of the inverter at present;
Step two, according to the target voltage, historical given voltage and preset step voltage, determining a first target given voltage at the current moment, wherein the historical given voltage is the first target given voltage at the previous moment;
Step three, adjusting the output voltage of the inverter according to the first output voltage, the first output current and the first target given voltage;
Step four, judging whether the difference value between the regulated output voltage of the inverter and the target voltage is not larger than a first preset voltage difference value,
If yes, the inverter is controlled to finish starting,
If not, repeating the steps one to four until the difference between the regulated output voltage of the inverter and the target voltage is not greater than the first preset voltage difference value, so as to control the inverter to finish starting;
The step of determining a first target given voltage at the current moment according to the target voltage, the historical given voltage and the preset step voltage comprises the following steps:
when the target voltage is greater than the history given voltage and a difference between the target voltage and the history given voltage is greater than or equal to the step voltage, taking a sum of the history given voltage and the step voltage as the first target given voltage;
Taking the target voltage as the first target given voltage when the target voltage is greater than the history given voltage and a difference between the target voltage and the history given voltage is less than the step voltage;
When the target voltage is less than or equal to the history given voltage and a difference between the history given voltage and the target voltage is greater than or equal to the step voltage, a difference between the history given voltage and the step voltage is taken as the first target given voltage;
The target voltage is taken as the first target given voltage in a case where the target voltage is less than or equal to the history given voltage and a difference between the history given voltage and the target voltage is less than the step-size voltage.
2. The method of claim 1, wherein the adjusting the output voltage of the inverter based on the first output voltage, the first output current, and the first target given voltage comprises:
determining a first target current according to the first target given voltage and the first output voltage, and determining a first reference voltage according to the first target current and the first output current;
And adjusting the output voltage of the inverter according to the first reference voltage.
3. The method of claim 2, wherein said determining a first target current from said first target given voltage and said first output voltage, and determining a first reference voltage from said first target current and said first output current, comprises:
proportional integral adjustment is carried out on the difference between the first target given voltage and the first output voltage so as to obtain the first target current;
Proportional integral adjustment is carried out on the difference between the first target current and the first output current so as to obtain a first voltage;
Feedforward decoupling is carried out on the first output current so as to obtain a second voltage;
The first reference voltage is determined from the first voltage and the second voltage.
4. The method of claim 1, wherein the plurality of inverters is provided, each of the inverters being in communication with each other, the method further comprising, after all of the inverters are started:
Acquiring active power and reactive power output by each inverter;
determining average active power according to the active power output by each inverter, and determining average reactive power according to the reactive power output by each inverter;
acquiring a second output voltage and a second output current of the current inverter;
And adjusting the output voltage of the inverter according to the target voltage, the second output current, the average active power and the average reactive power so that the output voltage difference among a plurality of inverters is not larger than a second preset voltage difference.
5. The method of claim 4, wherein the adjusting the output voltage of the inverter based on the target voltage, the second output current, the average active power, and the average reactive power comprises:
Determining a second target given voltage according to the active power, the reactive power, the average active power, the average reactive power and the target voltage output by the inverter;
Determining a second target current according to the second target given voltage and the second output voltage, and determining a second reference voltage according to the second target current and the second output current;
And adjusting the output voltage of the inverter according to the second reference voltage.
6. The method of claim 5, wherein said determining a second target current from said second target given voltage and said second output voltage, and determining a second reference voltage from said second target current and said second output current, comprises:
Proportional integral adjustment is carried out on the difference between the second target given voltage and the second output voltage so as to obtain the second target current;
Proportional integral adjustment is carried out on the difference between the second target current and the second output current so as to obtain a third voltage;
feedforward decoupling is carried out on the second output current so as to obtain a fourth voltage;
And determining the second reference voltage according to the third voltage and the fourth voltage.
7. The method of claim 4, wherein prior to said deriving active and reactive power output by each of said inverters, said method further comprises:
Acquiring an operation state of each inverter, wherein the operation state comprises a normal state or an abnormal state;
determining a main inverter among a plurality of the inverters according to the operation state;
the frequency and phase of the output voltage of the slave inverter are synchronized according to a synchronization signal generated by the master inverter, wherein the synchronization signal comprises the frequency and phase of the output voltage of the master inverter, and the slave inverter is any inverter except the master inverter.
8. An inverter control device is characterized in that, the inverter control device includes:
A memory;
A processor for performing the method of any of claims 1-7.
9. An inverter control system, comprising:
A plurality of inverter modules, wherein a plurality of inverter modules are connected and communicated with each other, and each inverter module comprises an inverter;
the inverter control device according to claim 8, wherein the inverter control device is connected to a plurality of the inverter modules;
and the plurality of inverter modules are respectively connected with the load.
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