CN110635484A - Method, device and equipment for generating instruction current of single-phase active filter - Google Patents
Method, device and equipment for generating instruction current of single-phase active filter Download PDFInfo
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Abstract
The invention discloses a method, a device and equipment for generating instruction current of a single-phase active filter, wherein the method comprises the following steps: acquiring load current, power grid voltage and direct-current side voltage at the current moment; reconstructing the voltage of the alternating current power grid at the current moment by using a single-phase-locked loop; constructing a fictitious current and a fictitious voltage signal by using a delay circuit; according to the difference between the voltage value of the direct current bus and the preset direct current voltage value, the component of compensating direct current loss power contained in the control command current is obtained; acquiring a control instruction current component which does not contain direct current loss power according to the load current and the alternating current power grid voltage; and summing the two current components to obtain the control command current at the current moment. The invention uses the reconstructed AC power grid voltage to reduce the influence of the power grid voltage distortion on the precision of the control command current, and uses a high-pass filter in the control command current component without DC power loss to avoid the influence of a low-pass filter on the current component in the conventional method.
Description
Technical Field
The invention relates to the technical field of active filtering, in particular to a method, a device and equipment for generating instruction current of a single-phase active filter.
Background
Due to the heavy use of various types of nonlinear loads in a single-phase power gridThe single-phase power grid suffers from serious pollution, and an Active Power Filter (APF) suitable for the single-phase power grid needs to be developed for effectively treating the single-phase power grid. The main principle is as shown in fig. 1, the control module generates a driving signal through a compensation current instruction to control a power switch tube S1～S4The compensation current is generated, the magnitude of the compensation current is the sum of harmonic wave and reactive current in the load current, and the direction of the compensation current is opposite to the sum of the harmonic wave and the reactive current in the load current, so that the purpose of active filtering is achieved. Therefore, the speed and progress of the compensation current command generation largely determine the performance index of the APF. In the prior art, a virtual three-phase or quadrature two-phase system is constructed in a single-phase system, and then a three-phase system i is usedp-iqA detection method is used for obtaining harmonic waves and fundamental wave reactive current of the single-phase circuit, and a detection schematic diagram is shown in figure 2. As can be seen from fig. 2, in these technical solutions, a Low Pass Filter (LPF) is an indispensable key link for obtaining a dc quantity, and the type, order, and cutoff frequency of the LPF directly determine the accuracy of the detection result. Patent CN 106356851 discloses a single-phase active power filter and a composite detection control method thereof, in which an extended two-dimensional unit is used to detect multiple specific subharmonics, the detection method is complex, and the influence of voltage fluctuation on the harmonic instruction precision is neglected; patent CN 105977979 a discloses a single-loop control algorithm for a single-phase parallel active power filter, but this algorithm depends on the accuracy of the model, and makes it difficult to avoid the influence of voltage fluctuation on the accuracy of the harmonic command by using the assumption that the active fluctuation in adjacent control periods is a constant.
Therefore, how to obtain the harmonic command current more simply and conveniently, avoiding the influence of the low-pass filter and the power grid voltage fluctuation in the existing algorithm on the harmonic command current, and improving the accuracy and speed of obtaining the harmonic command current is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a method, a device and equipment for generating single-phase active filter instruction current, which improve the accuracy and speed of the obtained harmonic instruction current by a reconstructed power grid voltage signal and a high-pass filtering link.
In order to solve the above technical problem, the present invention provides a method for generating a command current of a single-phase active filter, including:
acquiring load current, power grid voltage and direct-current side voltage at the current moment;
acquiring an angular frequency value and a phase value of the alternating current power grid at the current moment corresponding to the power grid voltage by using a single-phase-locked loop;
reconstructing the AC power grid voltage at the current moment after acquiring the effective value of the AC power grid voltage by using a single-phase effective value amplitude detection circuit;
constructing an imaginary current and an imaginary voltage signal which have a phase difference of pi/2 with the load current and the reconstructed alternating current network voltage by using a delay circuit;
according to the difference between the voltage value of the direct current bus and the preset direct current voltage value, the component of compensating direct current loss power contained in the control command current is obtained;
acquiring a control instruction current component which does not contain direct-current loss power according to the load current and the fictitious current thereof, the reconstructed alternating-current power grid voltage and the fictitious voltage thereof;
and summing the two current components to obtain the control command current at the current moment.
Optionally, reconstructing the ac power grid voltage at the current moment after obtaining the effective value of the ac power grid voltage by using the single-phase effective value amplitude detection circuit includes:
and multiplying the phase value of the alternating current power grid at the current moment acquired by the single-phase-locked loop by the effective value of the alternating current power grid voltage acquired by the single-phase effective value amplitude detection circuit by 1.414 times.
Optionally, the constructing, by using the delay circuit, the fictitious current and fictitious voltage signals with a pi/2 phase difference between the load current and the reconstructed ac grid voltage includes:
using iLβ(k)＝iLα(k-n) and Vsβ(k)＝Vsα(k-n) isRespectively obtaining an imaginary current and an imaginary voltage signal of the phase difference pi/2 between the load current and the reconstructed alternating current network voltage; wherein n is T/(4T)s) Where T2 pi/ω (k) is the grid voltage period, ω (k) is the angular frequency value, iLαFor the load current, VsαFor the reconstructed AC mains voltage, k being the current time, TsIs the sampling period.
Optionally, the obtaining a control instruction current component that does not include the dc loss power according to the load current and the imaginary current thereof, the reconstructed ac power grid voltage and the imaginary voltage thereof includes:
by using
Calculating the active power of the single-phase circuit at the current moment by using
Calculating the reactive power of the single-phase circuit at the current moment;
high-pass filtering the P (k) input with the output value Vsα(k) Multiplying and calculating to obtain a first component of the control instruction current component which does not contain the direct current loss power;
q (k) and Vsα(k) Multiplying and calculating to obtain a second component of the control instruction current component which does not contain the direct current loss power;
a value obtained by adding the first component and the second component, and
and dividing to obtain the control command current component which does not contain the direct current loss power.
Optionally, the calculating a component of the compensation dc loss power included in the control command current according to a difference between the dc bus voltage value and the preset dc voltage value includes:
the difference between the DC side voltage and the preset voltage value after passing through the low-pass filter is input to a proportional-integral controller, and the output of the PI controller are outputMultiplying the value of the DC side voltage after passing through the low-pass filter with the reconstructed AC power grid voltage at the current moment, and multiplying the result of the multiplication with the reconstructed AC power grid voltage
And dividing to obtain a component for compensating the direct current loss power contained in the control command current.
Optionally, the obtaining of the load current, the grid voltage, and the dc side voltage at the current moment includes:
and acquiring the load current, the grid voltage and the direct-current side voltage through a sampling circuit.
Optionally, after obtaining the harmonic command current at the current moment according to the load current, the active component, and the grid angular frequency value, the method further includes:
and outputting the difference between the harmonic command current and the compensation current at the current moment to a hysteresis comparator, and acquiring a PWM (pulse width modulation) modulation pulse output by the hysteresis comparator to perform current tracking compensation.
Optionally, the obtaining the load current, the grid voltage, and the dc-side voltage by using a sampling circuit includes:
and acquiring the load current, the grid voltage, the direct-current side voltage and the compensation current through a sampling circuit.
The generation method further comprises the following steps:
the sampling acquisition module is used for acquiring the load current, the power grid voltage and the direct current side voltage at the current moment;
a power grid phase acquisition module: the phase-locked loop is used for acquiring an angular frequency value and a phase value of the alternating current power grid at the current moment corresponding to the power grid voltage by using the phase-locked loop of the single-phase active filter;
a reconstruction module: the single-phase effective value amplitude detection circuit is used for reconstructing the AC power grid voltage at the current moment after acquiring the effective value of the AC power grid voltage;
an imaginary module: the circuit is used for constructing an imaginary current and an imaginary voltage signal which have a phase difference of pi/2 with the load current and the reconstructed AC network voltage by using a delay circuit;
the component calculation module comprises a compensation direct current loss power: the device is used for solving the component of compensating direct current loss power contained in the control command current according to the difference between the direct current bus voltage value and the preset direct current voltage value;
the control instruction current component calculation module does not contain direct current loss power: the control instruction current component which does not contain direct current loss power is obtained according to the load current and the fictitious current thereof, the reconstructed alternating current power grid voltage and the fictitious voltage thereof;
in addition, the present invention also provides a command current generating apparatus of a single-phase active filter, including:
a memory: for storing a computer program;
a processor: for implementing the steps of a harmonic command current acquisition method of a single-phase active filter as claimed in any one of the preceding claims when executing said computer program.
Therefore, the harmonic command current is obtained by utilizing the voltage reconstruction signal and the high-pass filtering link, the influence of the low-pass filter in the process of obtaining the harmonic command current is eliminated, the algorithm for obtaining the harmonic command current is quicker, the influence of voltage fluctuation on the generated command current precision is avoided, the compensation effect is better compared with a single-phase active filter of the traditional algorithm, and the user experience is improved; in addition, the invention also provides a device and equipment for generating the instruction current of the single-phase active filter, and the device and the equipment also have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a topology structure of a single-phase active filter and a system control thereof according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a harmonic command current acquisition method of a single-phase active filter in the prior art;
fig. 3 is a flowchart of a method for obtaining a harmonic command current of a single-phase active filter according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of another harmonic command current obtaining method for a single-phase active filter according to an embodiment of the present invention;
FIG. 5 is a graph of THD content in grid current before uncompensation provided by an embodiment;
FIG. 6 is a graph of THD content in compensated grid current provided by an embodiment;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, fig. 3 is a flowchart illustrating a command current generating method of a single-phase active filter according to an embodiment of the present invention. The method comprises the following steps:
step 101: and acquiring the load current, the power grid voltage and the direct current side voltage at the current moment.
The purpose of this step may be to obtain a load current (non-linear load side current), a grid voltage (single-phase grid voltage) and a dc side voltage, such as a load current i in fig. 4, required for calculating a harmonic command current at the present moment by a processor such as a DSP (Digital Signal Processing) chipLVoltage V of the power gridSAnd controlling the current output value idcCorresponding DC side voltage Vdc。
Specifically, the load current and the grid voltage at the current moment are obtained for a processor such as a DSP chipThe specific mode of the direct-current side voltage can be set by a designer according to a use scene and user requirements, and for example, the load current, the power grid voltage and the direct-current side voltage at the current moment can be directly acquired by a DSP chip; in consideration of the sampling rate and the calculation capability of the existing DSP chip, the sampling circuit may also be set to provide the DSP chip with sampling signals corresponding to the load current, the grid voltage, and the dc-side voltage at the present moment, for example, the sampling frequency of the sampling circuit may be set to fsAnd 10kHz, namely, the DSP chip acquires the load current, the power grid voltage and the direct current side voltage at the current moment through a sampling circuit. The present embodiment does not limit the load current, the grid voltage, and the dc-side voltage at the present moment as long as the processor can obtain the load current, the grid voltage, and the dc-side voltage.
Step 102: and acquiring the angular frequency value and the phase value of the alternating current power grid at the current moment corresponding to the power grid voltage by using the single-phase-locked loop.
The purpose of this step is to calculate the sampled grid voltage at the current time by using a single-Phase Locked Loop (PLL), and obtain the corresponding angular frequency value and Phase value of the ac grid, for example, the Phase Locked Loop (PLL) of the single-Phase parallel active filter in fig. 1 is implemented as a digital PLL, and the soft PLL is implemented to sample the sampled grid voltage V at the current timeSThe angular frequency value ω (k) and the phase value θ (k) at this time are calculated.
It can be understood that, the specific process of calculating the grid voltage at the current time by the phase-locked loop of the single-phase active filter in this step and acquiring the angular frequency value and the phase value of the ac grid at the current time can be implemented in a manner the same as or similar to that in the prior art, as long as the processor such as the DSP chip can acquire the angular frequency value and the phase value of the ac grid at the current time corresponding to the grid voltage at the current time by using the phase-locked loop of the single-phase active filter. The present embodiment does not set any limit to this.
Step 103: and reconstructing the voltage of the alternating current power grid at the current moment after the single-phase effective value amplitude detection circuit is used for acquiring the effective value of the voltage of the alternating current power grid.
The method comprises the following steps of obtaining an effective value of the alternating current power grid voltage by using a single-phase effective value amplitude detection circuit, and carrying out reconstruction calculation on the power grid voltage at the current moment.
Step 104: and constructing an imaginary current and an imaginary voltage signal which have a phase difference of pi/2 with the load current and the reconstructed alternating current network voltage by using the delay circuit.
Wherein the purpose of this step is to utilize the value V of the grid voltagesα(k) And the value of the grid current iLα(k) And constructing imaginary current and imaginary voltage signals which are different from the load current and the reconstructed alternating current network voltage by pi/2.
It is understood that the specific process of constructing the fictive current and fictive voltage signals with the phase difference of pi/2 from the load current and the reconstructed ac power grid voltage by the delay circuit in this step can be implemented in the same or similar manner as the prior art, as long as the processor such as the DSP chip can utilize its own inherent timer and the formula iLβ(k)＝iLα(k-n) and Vsβ(k)＝Vsα(k-n) to obtain a fictive current and a fictive voltage signal, which is not limited in this embodiment.
Step 105: and according to the difference between the voltage value of the direct current bus and the preset direct current voltage value, calculating the component of compensating direct current loss power contained in the control command current.
The purpose of this step may be to control the component of the compensation dc loss power included in the command current by using the dc bus voltage value at the current time, for example, a processor of a DSP chip.
Specifically, the step may include:
step 201: the difference between the direct current side voltage and the preset voltage value is input to a proportional-integral controller after passing through a low-pass filter;
step 202: multiplying the output of the PI controller by the value of the direct-current side voltage after passing through the low-pass filter and the reconstructed current-time alternating-current power grid voltage;
it can be understood that the PI control parameters in this step may be set by the designer or user;
step 203: multiplying the result of the multiplication with
Dividing to obtain a component of compensating direct current loss power contained in the control command current;
step 204: and acquiring a control instruction current component which does not contain direct-current loss power according to the load current and the fictitious current thereof, the reconstructed alternating-current power grid voltage and the fictitious voltage thereof.
The purpose of this step may be to calculate, for example, a processor of a DSP chip, a control instruction current component that does not include the dc loss power by using the load current, the grid voltage, and the angular frequency value at the present time.
Specifically, the step may include:
step 301: by using
Calculating the active power of the single-phase circuit at the current moment by usingCalculating the reactive power of the single-phase circuit at the current moment;
it is understood that the sampling frequency f of the sampling circuit in this stepsThe frequency of the processor acquiring the load current, the grid voltage and the direct current side voltage is 10kHz, which can be set by a designer or a user.
Step 302: high-pass filtering the P (k) input with the output value Vsα(k) Multiplying and calculating to obtain a first component of the control instruction current component which does not contain the direct current loss power;
step 303: q (k) and Vsα(k) Multiplying and calculating to obtain a second component of the control instruction current component which does not contain the direct current loss power;
step 304: a value obtained by adding the first component and the second component andand dividing to obtain the control command current component which does not contain the direct current loss power.
It should be noted that, the specific manner of calculating the control instruction current component not including the dc loss power in steps 301 to 304 according to the load current, the grid voltage and the angular frequency value may be set by a designer, as long as the processor such as the DSP chip can calculate the control instruction current component not including the dc loss power, which is not limited in this embodiment.
Step 107: and summing the two current components to obtain the control command current at the current moment.
Diagram five and diagram six are i before and after compensation respectivelySThe THD (total harmonic distortion) of (a), it is clear that the method provided by this embodiment meets the requirement that the national standard THD is less than 5%.
In the embodiment, the reconstructed alternating current power grid voltage is used for reducing the influence of the power grid voltage distortion on the accuracy of the control command current, and the high-pass filter is used in the control command current component without direct current loss power to avoid the influence of the low-pass filter used in the conventional method on the current component. Therefore, the method in the embodiment can effectively improve the acquisition precision and speed of the control command current.
In addition, the present invention also provides a command current generating apparatus of a single-phase active filter, including: a memory for storing a computer program; a processor for implementing the steps of the harmonic command current generation method of the single-phase active filter as provided in the above embodiments when executing the computer program.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the device and the equipment disclosed by the embodiment, the description is relatively simple because the device and the equipment correspond to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device and the equipment for generating the instruction current of the single-phase active filter provided by the invention are described in detail above. The principles and embodiments of the present invention have been described using specific examples, which are provided only to help understand the method and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for generating a command current for a single-phase active filter, comprising:
acquiring load current, power grid voltage and direct-current side voltage at the current moment;
acquiring an angular frequency value and a phase value of the alternating current power grid at the current moment corresponding to the power grid voltage by using a single-phase-locked loop;
reconstructing the AC power grid voltage at the current moment after acquiring the effective value of the AC power grid voltage by using a single-phase effective value amplitude detection circuit;
constructing an imaginary current and an imaginary voltage signal which have a phase difference of pi/2 with the load current and the reconstructed alternating current network voltage by using a delay circuit;
according to the difference between the voltage value of the direct current bus and the preset direct current voltage value, the component of compensating direct current loss power contained in the control command current is obtained;
acquiring a control instruction current component which does not contain direct-current loss power according to the load current and the fictitious current thereof, the reconstructed alternating-current power grid voltage and the fictitious voltage thereof;
and summing the two current components to obtain the control command current at the current moment.
2. The method for generating a single-phase active filter command current according to claim 1, wherein reconstructing the ac grid voltage at the present moment after obtaining the effective value of the ac grid voltage by using a single-phase effective value amplitude detection circuit comprises:
and multiplying the phase value of the alternating current power grid at the current moment acquired by the single-phase-locked loop by the effective value of the alternating current power grid voltage acquired by the single-phase effective value amplitude detection circuit by 1.414 times.
3. The method of claim 1, wherein the constructing the fictitious current and fictitious voltage signals with a phase difference of pi/2 from the load current and the reconstructed ac grid voltage using a delay circuit comprises:
using iLβ(k)＝iLα(k-n) and usβ(k)＝usα(k-n) respectively obtaining an imaginary current and an imaginary voltage signal of which the phase difference between the load current and the reconstructed alternating current network voltage is pi/2; wherein n is T/(4T)s) Where T2 pi/ω (k) is the grid voltage period, ω (k) is the angular frequency value, iLαIs the load current usαFor the reconstructed AC mains voltage, k being the current time, TsIs the sampling period.
4. The method according to claim 1, wherein obtaining a control command current component not including dc power loss from the load current and its imaginary current, the reconstructed ac grid voltage and its imaginary voltage comprises:
by using
Calculating the active power of the single-phase circuit at the current moment by using
Calculating the reactive power of the single-phase circuit at the current moment;
high-pass filtering the P (k) input with the output value Vsα(k) Multiplying and calculating to obtain a first component of the control instruction current component which does not contain the direct current loss power;
q (k) and Vsα(k) Multiplying and calculating to obtain a second component of the control instruction current component which does not contain the direct current loss power;
a value obtained by adding the first component and the second component, and
and dividing to obtain the control command current component which does not contain the direct current loss power.
5. The method for generating a command current of a single-phase active filter according to claim 1, wherein the step of calculating a component for compensating dc loss power included in the control command current according to a difference between the dc bus voltage value and a preset dc voltage value comprises:
the difference between the DC side voltage and the preset voltage value is input to a proportional-integral controller after passing through a low-pass filter, and the numerical value of the output of the PI controller and the DC side voltage after passing through the low-pass filter and the reconstructed current-time alternating current at the current moment are output by the PI controllerMultiplying the net voltage and multiplying the result of the multiplication with
And dividing to obtain a component for compensating the direct current loss power contained in the control command current.
6. The method for generating the command current of the single-phase active filter according to any one of claims 1 to 5, wherein the obtaining of the load current, the grid voltage and the DC side voltage at the current moment comprises:
and acquiring the load current, the grid voltage and the direct-current side voltage through a sampling circuit.
7. The method of claim 6, wherein the obtaining the harmonic command current at the current time is performed according to the load current, the active component, and the grid angular frequency value, and further comprising:
and outputting the difference between the harmonic command current and the compensation current at the current moment to a hysteresis comparator, and acquiring a PWM (pulse width modulation) modulation pulse output by the hysteresis comparator to perform current tracking compensation.
8. The method according to claim 7, wherein the obtaining the load current, the grid voltage, and the dc-side voltage by a sampling circuit comprises:
and acquiring the load current, the grid voltage, the direct-current side voltage and the compensation current through a sampling circuit.
9. A command current generating apparatus of a single-phase active filter, comprising:
a sampling acquisition module: the method comprises the steps of obtaining load current, power grid voltage and direct current side voltage at the current moment;
a power grid phase acquisition module: the phase-locked loop is used for acquiring an angular frequency value and a phase value of the alternating current power grid at the current moment corresponding to the power grid voltage by using the phase-locked loop of the single-phase active filter;
a reconstruction module: the single-phase effective value amplitude detection circuit is used for reconstructing the AC power grid voltage at the current moment after acquiring the effective value of the AC power grid voltage;
an imaginary module: the circuit is used for constructing an imaginary current and an imaginary voltage signal which have a phase difference of pi/2 with the load current and the reconstructed AC network voltage by using a delay circuit;
the component calculation module comprises a compensation direct current loss power: the device is used for solving the component of compensating direct current loss power contained in the control command current according to the difference between the direct current bus voltage value and the preset direct current voltage value;
the control instruction current component calculation module does not contain direct current loss power: and the method is used for acquiring the control instruction current component without the direct current loss power according to the load current and the fictitious current thereof, the reconstructed alternating current power grid voltage and the fictitious voltage thereof.
10. A command current generating apparatus of a single-phase active filter, comprising:
a memory: for storing a computer program;
a processor: steps for implementing a method of generating a command current for a single-phase active filter according to any one of claims 1 to 8 when executing said computer program.
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