CN110535175B - Constant power control method and system applied to micro-source inverter of micro-grid - Google Patents
Constant power control method and system applied to micro-source inverter of micro-grid Download PDFInfo
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Abstract
The constant power control method and system of the micro-source inverter applied to the micro-grid are provided by the present disclosure, voltage and current signals output to a bus by the inverter are collected, and park transformation is performed to obtain voltages vod, voq, currents iLd, iLq; the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current; the current value obtained by dividing the reactive reference value by the voltage voq is different from iLq, and the difference is input into a current single-loop controller for adjustment to obtain the adjusted reactive current; carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal; the control signal is output to the inverter to realize the control of the switch tube, so that the power output by the micro power inverter is consistent with the power reference value. The present disclosure better maintains system voltage and frequency near nominal values with less variation fluctuation.
Description
Technical Field
The disclosure relates to the technical field of power distribution networks, and in particular relates to a constant power control method and system applied to a micro-source inverter of a micro-grid.
Background
With the development of power grid technology, at present, a power distribution network comprises a plurality of micro power supplies, which have different characteristics and different power generation principles. If the wind power generation and the photovoltaic power generation are simultaneously put into the system by utilizing the characteristic that the wind power resource and the sunlight resource are naturally complementary in time, the intermittence of independent power supply can be naturally compensated, and the system naturally has reliable power supply performance to a certain degree.
The storage battery and the super capacitor for storing energy in the micro-grid are used for storing the energy, and the micro-grid inverter needs to be used after inverting the stored energy when the energy is configured.
Disclosure of Invention
An object of the embodiments of the present disclosure is to provide a constant power control method applied to a micro-source inverter of a micro-grid, so that power output by a micro-source is consistent with a power reference value.
The embodiment of the specification provides a constant power control method applied to a micro-source inverter of a micro-grid, which is realized by the following technical scheme:
the method comprises the following steps:
collecting voltage and current signals output to a bus by an inverter, and carrying out park transformation to obtain voltages vod and voq and currents iLd and iLq;
the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current;
the current value obtained by dividing the reactive reference value by the voltage voq is different from iLq, and the difference is input into a current single-loop controller for adjustment to obtain the adjusted reactive current;
carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal;
the control signal is output to the inverter to realize the control of the switch tube, so that the power output by the micro power inverter is consistent with the power reference value.
The embodiment of the specification provides a constant power control system applied to a micro-source inverter of a micro-grid, and the constant power control system is realized by the following technical scheme:
the method comprises the following steps:
a voltage-to-current conversion module configured to: collecting voltage and current signals output to a bus by an inverter, and carrying out park transformation to obtain voltages vod and voq and currents iLd and iLq;
an active current regulation module configured to: the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current;
a reactive current regulation module configured to: the current value obtained by dividing the reactive reference value by the voltage voq is different from iLq, and the difference is input into a current single-loop controller for adjustment to obtain the adjusted reactive current;
a signal adjustment module configured to: carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal;
the control signal is output to the inverter to realize the control of the switch tube, so that the power output by the micro power inverter is consistent with the power reference value.
Compared with the prior art, the beneficial effect of this disclosure is:
the super capacitor has small capacity, and if the instantly released power is larger, the capacity lower limit can be reached, so that the super capacitor cannot be used for supporting the system voltage and frequency.
When a system has a large power difference, the charging and discharging process of the storage battery can be optimized by the super capacitor, frequent charging and discharging of the storage battery are avoided, and the voltage and the frequency of the system can be better kept near a rated value to be fluctuated by small deviation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a main circuit diagram of a three-phase voltage source inverter according to an embodiment of the present disclosure;
FIG. 2 is a PQ control schematic diagram of an embodiment of the present disclosure;
fig. 3 is a block diagram of an iLd control architecture of an embodiment of the present disclosure;
FIG. 4 is a graph of the open loop transfer function Bode of a current loop in an example embodiment of the disclosure;
FIG. 5(a) is a graph of active and reactive power output from a micro-source according to an embodiment of the present disclosure;
fig. 5(b) is a waveform diagram of a phase bus voltage, frequency and current according to an embodiment of the disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The present disclosure employs a constant power control approach to a supercapacitor interface inverter and discusses a power reference acquisition approach in detail. Then, networking dynamic simulation and analysis are carried out, and the effectiveness of the model and the control strategy is proved by a simulation result.
Example of implementation 1
And the three-phase voltage type inverter is used as an interface inverter of the micro-source. The main circuit of which is shown in figure 1. In fig. 1, VDC is a dc input voltage source, representing the port output voltages of various micro power supplies; lf and Cf form an LC filter; z is a load; vA, vB and vC are bridge arm midpoint voltages of the inverter; voa, vob and voc are output voltages of the inverter after filtering, namely load voltages; iLa, iLb, iLc are the currents flowing through the filter inductor; the iCa, the iCb and the iCc are currents flowing through the filter capacitor; ioa, iob, ioc are the output currents after filtering.
Referring to fig. 2, the constant power control mode may be referred to as a PQ control mode, and the main objective is to make the output power of the micro-power source consistent with a power reference value. The method is generally suitable for the condition that a micro-grid and a large grid are connected in a grid mode to operate or independent operation with voltage and frequency support can be provided by other micro-sources, and the output power of the micro-power source can be adjusted only by controlling inverted output current so that the micro-power source can output according to a reference power instruction value. Therefore, only one current single-loop controller is needed to regulate the active and reactive currents.
The whole technical concept is as follows: collecting voltage and current signals output to a bus of an inverter, and carrying out park transformation to obtain voltage vod,voq，vod,voqFor d-q axis instantaneous voltage, current i, obtained after park transformationLd，iLq，iLd，iLqAnd for the dq-axis current component flowing through the filter inductor, the active reference value is subtracted from the vod to obtain a current reference value, and the current reference value is subtracted from the iLd, and the current reference value is input to the current single-loop controller to be adjusted to obtain the adjusted active current. Current loop: three-phase instantaneous value current is park converted into dq axis component, then compared with reference signal output by power controller, and error is correctedAnd (5) performing line PI control. Here, since precise control of power is to be achieved, a PI regulator is employed.
The current value obtained by dividing the reactive reference value by the voltage voq is different from iLq, the difference is input to a current single-loop controller for adjustment to obtain adjusted reactive current, information obtained by performing park inverse transformation on the adjusted active current and reactive current is subjected to signal modulation SPWM to obtain 6 paths of control signals, a signal for controlling the output voltage component of the dq axis is subjected to park inverse transformation on the direct current modulation signal, and a three-phase alternating current modulation signal is obtained and is divided into six paths. The output is transmitted to the inverter to realize the control of the switch tube, so that the power output by the micro power supply is consistent with the power reference value.
Assuming that the d-axis of the two-phase rotating coordinate system coincides with the bus voltage vector vod, the q-axis component voq of the bus voltage vector is 0, and the inverter output power can be expressed as the current flowing through the filter capacitor
P＝vodiLd
Q＝-vodiLq (1)
The vod in the formula (1) is constant, and thus the dq axis reference value of the current loop is obtained
iLdref＝Pref/vod
iLqref＝Qref/vod (2)
The current single loop needs to realize accurate power control, so a PI regulator is adopted. Give iLdFig. 3 is a block diagram of the control structure of (1).
The voltage output by the micro-source inverter in the PQ control mode is determined by a large power grid or a micro-source providing voltage and frequency support, and the output power of the micro-source can be adjusted only by controlling the inverted output current so as to be output according to a reference power instruction value. Therefore, only one current single-loop controller is needed to regulate the active and reactive currents.
Current loop: three-phase instantaneous value current is converted into dq axis component after park conversion, then compared with reference signal output by power controller, and PI control is carried out to error.
Simultaneously: compared with a capacitance current loop, the stability of the system is slightly higher by adopting an inductance current loop. Therefore, the current loop in the PQ control system adopts filter inductor current feedback.
In the figure, LfRepresenting the inductance of the filter, and Kpi is the proportional coefficient of the PI controller; kii is an integration coefficient. Neglecting the disturbance of vod, combining small inertia time constants, making TII equal to Ti +0.5Ts, and obtaining the open loop transfer function of the current loop of iLd as
LfRepresenting the inductance of the filter, and Kpi is the proportional coefficient of the PI controller; kii is an integration coefficient. Neglecting the disturbance of vod, combining small inertia time constants, and making TII equal to Ti +0.5Ts, KPWMAnd is equivalent proportionality coefficient of PWM link.
The model is designed into a II type system, and finally the parameters of the PQ control current loop PI regulator can be obtained as follows
Using the parameters listed in table 1, Kpi is 0.0428 and Kii is 122.45. The amplitude-frequency characteristic Bode graph of the open loop transfer function of the current loop is shown in fig. 4.
TABLE 1 Main Circuit parameters and control System time constants
As can be seen from fig. 4, the system phase angle margin is now 41.1 deg., so the controller parameters are designed to stabilize the system.
Example II
Constant power control operation simulation: introduction of simulation working conditions: the simulation time is 1 s; in the time period of 0-0.4s, the micro source is required to output active power of 10kW, and in the time period of 0.4-1s, the micro source is required to output active power of 6.7 kW; and (3) 0-0.6s, requiring the micro source not to output reactive power, and 0.6-1s requiring the micro source to output reactive power of 5 kvar. The proportional gain Kpi of the current controller is 0.0428, and the integral gain Kii is 122.45. The simulation results are shown in fig. 5(a) to 5 (b).
As can be seen from fig. 5(a), the micro power source controlled by constant power can change its output according to the power command value; 5(b), the voltage and the frequency of the system bus are supported by a large power grid, are not changed by the fluctuation of the output power of the micro-grid, are kept unchanged at a rated value, the current phase is in the same phase with the voltage before 0.6s, and the phase shift is generated after 0.6s according to the change of the reactive instruction. Therefore, the design correctness of the constant power control mode is verified.
Example III
The embodiment of the specification provides a constant power control system applied to a micro-source inverter of a micro-grid, and the constant power control system is realized by the following technical scheme:
the method comprises the following steps:
a voltage-to-current conversion module configured to: collecting voltage and current signals output to a bus by an inverter, and carrying out park transformation to obtain voltages vod and voq and currents iLd and iLq;
an active current regulation module configured to: the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current;
a reactive current regulation module configured to: the current value obtained by dividing the reactive reference value by the voltage voq is different from iLq, and the difference is input into a current single-loop controller for adjustment to obtain the adjusted reactive current;
a signal adjustment module configured to: carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal;
the control signal is output to the inverter to realize the control of the switch tube, so that the power output by the micro power inverter is consistent with the power reference value.
The first embodiment of the design of specific parameters of the current single-loop controller in this embodiment is not discussed in detail here.
Example four
The present specification provides a computer device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the constant power control method applied to the micro-source inverter of the micro-grid when executing the program.
In this embodiment, the specific process of the constant power control method applied to the micro-source inverter of the micro-grid is described in the first embodiment, and will not be discussed in detail here.
It should be noted that although several modules or sub-modules of the device are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the modules described above may be embodied in one module in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module described above may be further divided into embodiments by a plurality of modules.
Example five
A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, realizes the steps of a constant power control method applied to a micro-source inverter of a micro-grid.
In this embodiment, the specific process of the constant power control method applied to the micro-source inverter of the micro-grid is described in the first embodiment, and will not be discussed in detail here.
In the present embodiments, a computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for performing various aspects of the present disclosure. The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or materials described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (8)
1. The constant power control method of the micro-source inverter applied to the micro-grid is characterized by comprising the following steps:
collecting voltage and current signals output to a bus by an inverter, and carrying out park transformation to obtain voltages vod and voq, wherein currents iLd and iLq are dq-axis current components flowing through a filter inductor;
the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current;
the current value obtained by dividing the reactive reference value by the voltage vod is different from iLq, and the difference is input to a current single-loop controller for adjustment to obtain the adjusted reactive current;
carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal;
the control signal is output to the inverter to realize the control of the switching tube, so that the power output by the micro power inverter is consistent with a power reference value;
the current single-loop controller is a PI (proportional integral) regulator, the disturbance of vod is ignored, a small inertia time constant is combined, TII (time information instrument) is equal to Ti +0.5Ts, Ti is a control system time constant, and the current loop open-loop transfer function of iLd is obtained:
wherein Kii is an integral coefficient, Kpi is a proportional coefficient of the PI regulator, and specifically,
2. the constant power control method of a micro-source inverter applied to a micro-grid according to claim 1, wherein the inverter is a three-phase voltage type inverter.
3. The method of claim 1, wherein if the d-axis of the two-phase rotating coordinate system coincides with the bus voltage vector vod, the bus voltage vector q-axis component voq is 0, the current flowing through the filter capacitor is ignored, and the inverter output power is expressed as 0
P＝vodiLd
Q＝-vodiLq。
4. The constant power control method of the micro-source inverter applied to the micro-grid according to claim 3, wherein vod is constant and the dq-axis reference value of the current loop is
iLdref＝Pref/vod
iLqref＝Qref/vod。
5. A constant power control system for a micro-source inverter applied to a micro-grid is characterized by comprising:
a voltage-to-current conversion module configured to: collecting voltage and current signals output to a bus by an inverter, and carrying out park transformation to obtain voltages vod and voq, wherein currents iLd and iLq are dq-axis current components flowing through a filter inductor;
an active current regulation module configured to: the current value obtained by dividing the active reference value by vod is different from iLd, and the difference is input to a current single-loop controller for regulation to obtain regulated active current;
a reactive current regulation module configured to: the current value obtained by dividing the reactive reference value by the voltage vod is different from iLq, and the difference is input to a current single-loop controller for adjustment to obtain the adjusted reactive current;
a signal adjustment module configured to: carrying out park inverse transformation on the adjusted active current and reactive current to obtain a signal, and modulating the signal by the SPWM to obtain a control signal;
the control signal is output to the inverter to realize the control of the switching tube, so that the power output by the micro power inverter is consistent with a power reference value;
the current single-loop controller is a PI (proportional integral) regulator, the disturbance of vod is ignored, a small inertia time constant is combined, TII (time information instrument) is equal to Ti +0.5Ts, Ti is a control system time constant, and the current loop open-loop transfer function of iLd is obtained:
wherein Kii is an integral coefficient, Kpi is a proportional coefficient of the PI regulator, and specifically,
6. the constant power control system for the micro-source inverter applied to the micro-grid according to claim 5, wherein the inverter is a three-phase voltage type inverter.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method of constant power control applied to a micro-source inverter of a micro-grid according to any one of claims 1 to 4.
8. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the method for constant power control of a micro-source inverter applied to a micro-grid according to any one of claims 1 to 4.
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| CN104333244A (en) * | 2014-10-20 | 2015-02-04 | 中国南方电网有限责任公司 | Positive sequence component-based three-phase inverter control method and device |
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