CN112054525A - Series active power filter - Google Patents
Series active power filter Download PDFInfo
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- CN112054525A CN112054525A CN202010892773.0A CN202010892773A CN112054525A CN 112054525 A CN112054525 A CN 112054525A CN 202010892773 A CN202010892773 A CN 202010892773A CN 112054525 A CN112054525 A CN 112054525A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The invention provides a series active power filter, which comprises a main power circuit based on Boost topology and a control circuit, wherein a current transformer is used for collecting the current of an active switch S, a voltage loop and a current loop are arranged in the control circuit, a multiplier is used for realizing the generation of a reference signal of the circuit control loop, a current synthesizer is used for calculating the average value of the current of an inductor L1 in real time, and a carrier generator is used for controlling the frequency of a PWM signal. The invention realizes the purpose of average current control, reduces the complexity of the sampling process and the subsequent processing and saves the cost.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a series active power filter.
Background
With the increasing severity of global energy crisis and environmental pollution, people pay more and more attention to the reduction of power grid loss and the improvement of energy efficiency. On the other hand, in modern society, electronic equipment and electric devices are increasingly used, and the nonlinear load faced by the power grid is increasing day by day. These non-linearities reduce the line power factor, greatly increasing reactive demand and line losses, while causing electromagnetic interference with nearby loads and overheating distribution transformers. To alleviate these problems, active power filters have been developed in various countries. From the viewpoint of the form of connection with the grid and the load, the active power filter is generally classified into a parallel type and a series type. The parallel type is generally suitable for current-rigid inductive loads, while the series type is generally suitable for voltage-rigid capacitive loads.
The series active power filter enables the line current and the line voltage to have the same phase through certain control, and simultaneously contains harmonic components as few as possible. In controlling this, a peak current mode and an average current mode are generally employed. The peak current mode is relatively simple and only part of the inductor current needs to be sampled. However, this control method has an error between the peak value and the average value, and is not accurate. Especially, when the active power filter is in a light load or zero-crossing state, the distortion is severe. For the average current mode, it is often complicated to sample the entire inductor current or to sample the currents of the active and passive switches separately and combine them. Meanwhile, two error amplifiers are needed to process the voltage error and the current error respectively.
Disclosure of Invention
The invention aims to provide a series active power filter, which realizes average current control, improves the precision, reduces the complexity of a sampling process and subsequent processing, and solves the technical problems of large error between peak values and average values and low precision in the prior art.
The embodiment of the invention provides a series active power filter, which comprises:
the main power circuit is used for rectifying commercial power of the input source to obtain a second voltage and outputting the second voltage to the control circuit; boosting the second voltage to obtain a first voltage, and outputting the first voltage and a current signal of an active power switch S to the control circuit;
the control circuit is used for carrying out voltage reduction processing on the input first voltage to generate a first voltage division signal; carrying out error compensation processing on the first partial pressure signal to generate a first output signal; the voltage-reducing circuit is used for carrying out voltage-reducing processing on the input second voltage to generate a second voltage-dividing signal and acquiring an envelope of the second voltage to generate a sinusoidal envelope signal; calculating the sine envelope signal and the first output signal to obtain a reference current signal; calculating a current signal of an active power switch, the first voltage division signal, the second voltage division signal and a switch-on time signal of a switch period of the active power switch to obtain an output current signal; and generating a pulse width modulation signal according to the output current signal and the reference current signal, and driving an active power switch S in the main power circuit through the pulse width modulation signal.
Preferably, the main power circuit includes:
the bridge rectifier is used for rectifying the mains supply voltage of the input source to obtain a second voltage, and outputting the second voltage to the Boost converter and the control circuit;
and the Boost converter is used for boosting the second voltage input by the bridge stack to obtain a first voltage and outputting the first voltage and a current signal of the active power switch to the control circuit.
Preferably, the bridge stack comprises:
a first diode D1, a second diode D2, a third diode D3, a fourth diode D4; the anode of the first diode D1 and the cathode of the third diode D3 are connected with a live line of the mains supply; the anode of the second diode D2 and the cathode of the fourth diode D4 are connected with the zero line of the commercial power.
Preferably, the Boost converter includes:
an inductor L1, a sixth diode D6, an active power switch S, a current sensor CT1, a second capacitor C2, a first capacitor C1 and a fifth diode D5; one end of the inductor L1 is connected to the anode of the first diode D1, the anode of the second diode D2 and the anode of the first capacitor C1, and the other end of the inductor L1 is connected to the anode of the sixth diode D6 and the first end of the current transformer CT 1; the cathode of the sixth diode D6 is connected to the anode of the second capacitor C2; the cathode of the second capacitor C2 is connected to the anode of the fifth diode D5, the source of the active power switch S, the cathode of the first capacitor C1, the anode of the third diode D3 and the anode of the fourth diode D4; the drain of the active power switch S is connected to the second terminal of the current transformer CT1 and the cathode of the fifth diode D5, the third terminal of the current transformer CT1 outputs a first current CTA, and the fourth terminal of the current transformer CT1 outputs a second current CTB.
Preferably, the control circuit includes: the first voltage division network is used for carrying out voltage reduction processing on the received first voltage, generating a first voltage division signal and transmitting the first voltage division signal to the first error amplifier and the first compensator;
the reference voltage chip is used for providing a stable reference voltage value for the first error amplifier;
a first error amplifier for calculating an error value of the first divided voltage signal according to a received reference voltage value and outputting an error voltage signal;
the first compensator is used for providing a relative opposite change value for the error voltage signal and converting the error voltage signal into a first output signal;
the second voltage division network is used for carrying out voltage reduction processing on the received second voltage to generate a second voltage division signal, acquiring the envelope of the second voltage to generate a sinusoidal envelope signal, and transmitting the sinusoidal envelope signal to the multiplier;
and the multiplier is used for receiving the first output signal and the sinusoidal envelope signal, multiplying the first output signal and the sinusoidal envelope signal and generating a reference current signal.
Preferably, the control circuit further includes:
the current synthesizer is used for calculating an output current signal according to the received current signal of the active power switch S, the first voltage division signal, the second voltage division signal and the on-time signal of the switching period of the active power switch S;
a second error amplifier for calculating an error value of the output current signal according to the received reference current signal and outputting an error current signal;
the second compensator is used for providing a relative opposite change value for the error current signal and converting the error current signal into an input signal of a pulse width modulation generator;
a pulse width modulation generator for comparing an input signal of the pulse width modulation generator with a ramp signal to generate a pulse width modulation signal;
and the carrier wave generator is used for providing a ramp signal for the pulse width modulation generator.
Preferably, the pwm generator receives a current signal of an active power switch, the first voltage-dividing signal, the second voltage-dividing signal, and an on-time signal of a switching cycle of the active power switch, wherein the current signal of the active power switch includes a first current signal CTA and a second current signal CTB;
and calculating the received current signal of the active power switch, the first voltage division signal, the second voltage division signal and the on-time signal of the switching period of the active power switch by using the falling slope of the current of the inductor L1 in each switching period in the switching S turn-off period to obtain the average value of the current of the inductor L1, and outputting the average value of the current of the inductor L1 as an output current signal to the second error amplifier.
Preferably, the pwm generator inputs the pwm signal to the gate of the active power switch S.
In summary, the embodiment of the invention has the following beneficial effects:
according to the series active power filter provided by the invention, the control circuit can stably output voltage at a set value through the voltage loop; sine input current waveform through a current loop and phase difference between input current with small advance and input voltage; the current synthesizer is used for calculating the falling slope of the current of the inductor L1 in the turn-off time period of the switch S and further calculating the average value of the current of the inductor L1; further controlling the current frequency of the main power circuit by controlling the frequency of PWM (pulse width modulation signal) using a carrier generator; the purpose of average current control is achieved, the complexity of a sampling process and subsequent processing is reduced, and cost is saved.
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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a series active power filter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a main power circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a control circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of a series active power filter according to the present invention. In this embodiment, the method includes:
as shown in fig. 2, the main power circuit is configured to rectify a commercial power of an input source to obtain a second voltage, and output the second voltage to the control circuit; boosting the second voltage to obtain a first voltage, and outputting the first voltage and a current signal of an active power switch S to the control circuit; as can be understood, the mains voltage as an input source is rectified by a bridge rectifier composed of diodes and then input into a Boost converter.
In a specific embodiment, the main power circuit includes:
the bridge rectifier is used for rectifying the mains supply voltage of the input source to obtain a second voltage, and outputting the second voltage to the Boost converter and the control circuit; specifically, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4; the anode of the first diode D1 and the cathode of the third diode D3 are connected with a live line of the mains supply; the anode of the second diode D2 and the cathode of the fourth diode D4 are connected with the zero line of the commercial power.
The Boost converter is used for boosting the second voltage input by the bridge stack to obtain a first voltage and outputting the first voltage and a current signal of the active power switch to the control circuit;
specifically, the inductor L1, the sixth diode D6, the active power switch S, the current sensor CT1, the second capacitor C2, the first capacitor C1, and the fifth diode D5; one end of the inductor L1 is connected to the anode of the first diode D1, the anode of the second diode D2 and the anode of the first capacitor C1, and the other end of the inductor L1 is connected to the anode of the sixth diode D6 and the first end of the current transformer CT 1; the cathode of the sixth diode D6 is connected to the anode of the second capacitor C2; the cathode of the second capacitor C2 is connected to the anode of the fifth diode D5, the source of the active power switch S, the cathode of the first capacitor C1, the anode of the third diode D3 and the anode of the fourth diode D4; a drain of the active power switch S is connected to the second terminal of the current transformer CT1 and the cathode of the fifth diode D5, a third terminal of the current transformer CT1 outputs a first current CTA, and a fourth terminal of the current transformer CT1 outputs a second current CTB; as can be appreciated, the fifth diode D5 is an anti-parallel parasitic body diode of the active power switch S; current transformer CT1 gathers active switch S 'S electric current, and there is a turn winding current transformer CT 1' S primary side, and the turn of secondary side winding carries out different designs according to actual conditions.
As shown in fig. 3, the control circuit is configured to perform voltage reduction processing on the input first voltage to generate a first voltage division signal; carrying out error compensation processing on the first partial pressure signal to generate a first output signal; the voltage-reducing circuit is used for reducing the input second voltage to generate a second voltage-dividing signal, acquiring the envelope of the second voltage to generate a sinusoidal envelope signal, and operating the sinusoidal envelope signal and the first output signal to obtain a reference current signal; synthesizing a current signal of an active power switch, the first voltage division signal, the second voltage division signal and an on-time signal of a switching period of the active power switch into an output current signal; generating a pulse width modulation signal according to the output current signal and the reference current signal, and driving an active power switch S in the main power circuit through the pulse width modulation signal; as can be understood, the first voltage division network, the first error amplifier, the first compensator and the reference voltage chip form a voltage control loop; the first voltage Vo is subjected to voltage reduction through the first voltage division network and then is compared with a voltage reference provided by a reference voltage chip, and an obtained error signal is subjected to the action of a first error amplifier and a first compensator to obtain a voltage loop output signal (a first output signal); meanwhile, a sinusoidal envelope signal and a voltage loop output signal obtained after the second voltage Vac is subjected to voltage reduction through a second voltage division network are both used as the input of the multiplier to carry out operation; the output signal of the multiplier is used as the current reference of the current control loop and compared with the output of the current synthesizer, the error signal is acted by the second error amplifier and the second compensator to obtain the output signal of the current control loop (the input signal of the pulse width modulation generator), and the signal is compared with the ramp signal generated by the carrier generator, so that a PWM (pulse width modulation) signal Gs is generated to drive the active power switch S.
In a specific embodiment, the control circuit is provided with a voltage loop and a current loop; specifically, the voltage loop is responsible for stabilizing the output voltage at a set value, and includes: the first voltage division network is used for carrying out voltage reduction processing on the received first voltage to generate a first voltage division signal, and the first voltage division signal is transmitted to the first error amplifier and the first compensator;
the reference voltage chip is used for providing a stable reference voltage value for the first error amplifier;
a first error amplifier for calculating an error value of the first divided voltage signal according to a received reference voltage value and outputting an error voltage signal;
the first compensator is used for providing a relative opposite change value for the error voltage signal and converting the error voltage signal into a first output signal;
the second voltage division network is used for carrying out voltage reduction processing on the received second voltage to generate a second voltage division signal, acquiring the envelope of the second voltage to generate a sinusoidal envelope signal, and transmitting the sinusoidal envelope signal to the multiplier;
the multiplier is used for receiving the first output signal and the sinusoidal envelope signal, multiplying the first output signal and the sinusoidal envelope signal and generating a reference current signal; it will be appreciated that the reference signal generation of the current control loop is achieved using a high linearity multiplier which has a high linearity over the nominal input and output signal operating range.
Specifically, the current loop is responsible for the sine of the input current waveform and the phase difference between the input current with small advance and the input voltage, and comprises the following steps: a current synthesizer, configured to calculate an output current signal (an average value of the current of the inductor L1) according to the received current signal of the active power switch S, the first voltage-dividing signal, the second voltage-dividing signal, and an on-time signal of a switching period of the active power switch S; as can be appreciated, the current synthesizer calculates the average value of the inductor L1 current in real time; the algorithm operation can be carried out according to the required electric quantity input signals, so that the average value of the current of the inductor L1 in each switching period can be calculated in real time. Specific input signals include a divided input signal and an output signal (a first divided signal and a second divided signal), current signals (a first current signal CTA and a second current signal CTB) of the active switch S, conduction time of the active switch S in each switching period, and inductance of the inductor L1; the falling gradient of the inductor L1 current in the switch S turn-off period is calculated according to the relation among the inductor L1 voltage, the rising gradient of the inductor L1 current in the switch S turn-on period and the inductance.
A second error amplifier for calculating an error value of the output current signal according to the received reference current signal and outputting an error current signal;
the second compensator is used for providing a relative opposite change value for the error current signal and converting the error current signal into an input signal of a pulse width modulation generator;
a pulse width modulation generator for comparing an input signal of the pulse width modulation generator with a ramp signal to generate a pulse width modulation signal; it will be appreciated that the carrier generator controls the frequency of the PWM (pulse width modulation) signal, in particular the frequency of the ramp signal generated by the carrier generator, i.e. the operating switching frequency of the active power filter.
A carrier generator for providing a ramp signal to the PWM generator, it being understood that the carrier generator is used to control the frequency of a PWM (pulse width modulation) signal.
In summary, the embodiment of the invention has the following beneficial effects:
according to the series active power filter provided by the invention, the control circuit can stably output voltage at a set value through the voltage loop; sine input current waveform through a current loop and phase difference between input current with small advance and input voltage; the current synthesizer is used for calculating the falling slope of the current of the inductor L1 in the turn-off time period of the switch S and further calculating the average value of the current of the inductor L1; further controlling the current frequency of the main power circuit by controlling the frequency of PWM (pulse width modulation signal) using a carrier generator; the purpose of average current control is achieved, the complexity of a sampling process and subsequent processing is reduced, and cost is saved.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (8)
1. A series active power filter, comprising:
the main power circuit is used for rectifying commercial power of the input source to obtain a second voltage and outputting the second voltage to the control circuit; boosting the second voltage to obtain a first voltage, and outputting the first voltage and a current signal of an active power switch S to the control circuit;
the control circuit is used for carrying out voltage reduction processing on the input first voltage to generate a first voltage division signal; carrying out error compensation processing on the first partial pressure signal to generate a first output signal; the voltage-reducing circuit is used for carrying out voltage-reducing processing on the input second voltage to generate a second voltage-dividing signal and acquiring an envelope of the second voltage to generate a sinusoidal envelope signal; calculating the sine envelope signal and the first output signal to obtain a reference current signal; calculating a current signal of an active power switch, the first voltage division signal, the second voltage division signal and a switch-on time signal of a switch period of the active power switch to obtain an output current signal; and generating a pulse width modulation signal according to the output current signal and the reference current signal, and driving an active power switch S in the main power circuit through the pulse width modulation signal.
2. The series active power filter of claim 1, wherein the main power circuit comprises:
the bridge rectifier is used for rectifying the mains voltage of the input source to obtain a second voltage, and outputting the second voltage to the Boost converter and the control circuit;
and the Boost converter is used for boosting the second voltage input by the bridge stack to obtain a first voltage and outputting the first voltage and a current signal of the active power switch to the control circuit.
3. The series active power filter of claim 2, wherein the bridge stack comprises:
a first diode D1, a second diode D2, a third diode D3, a fourth diode D4; the anode of the first diode D1 and the cathode of the third diode D3 are connected with a live line of the mains supply; the anode of the second diode D2 and the cathode of the fourth diode D4 are connected with the zero line of the commercial power.
4. A series active power filter as claimed in claim 3, wherein the Boost converter comprises:
an inductor L1, a fifth diode D5, a sixth diode D6, an active power switch S, a current sensor CT1, a first capacitor C1 and a second capacitor C2; one end of the inductor L1 is connected to the anode of the first diode D1, the anode of the second diode D2 and the anode of the first capacitor C1, and the other end of the inductor L1 is connected to the anode of the sixth diode D6 and the first end of the current transformer CT 1; the cathode of the sixth diode D6 is connected to the anode of the second capacitor C2; the cathode of the second capacitor C2 is connected to the anode of the fifth diode D5, the source of the active power switch S, the cathode of the first capacitor C1, the anode of the third diode D3 and the anode of the fourth diode D4; the drain of the active power switch S is connected to the second terminal of the current transformer CT1 and the cathode of the fifth diode D5, the third terminal of the current transformer CT1 outputs a first current CTA, and the fourth terminal of the current transformer CT1 outputs a second current CTB.
5. The series active power filter of claim 4, wherein the control circuit comprises:
the first voltage division network is used for carrying out voltage reduction processing on the received first voltage to generate a first voltage division signal, and the first voltage division signal is transmitted to the first error amplifier and the first compensator;
the reference voltage chip is used for providing a stable reference voltage value for the first error amplifier;
a first error amplifier for calculating an error value of the first divided voltage signal according to a received reference voltage value and outputting an error voltage signal;
the first compensator is used for providing a relative opposite change value for the error voltage signal and converting the error voltage signal into a first output signal;
the second voltage division network is used for carrying out voltage reduction processing on the received second voltage to generate a second voltage division signal, acquiring the envelope of the second voltage to generate a sinusoidal envelope signal, and transmitting the sinusoidal envelope signal to the multiplier;
and the multiplier is used for receiving the first output signal and the sinusoidal envelope signal, multiplying the first output signal and the sinusoidal envelope signal and generating a reference current signal.
6. The series active power filter of claim 5, wherein the control circuit further comprises:
the current synthesizer is used for calculating an output current signal according to the received current signal of the active power switch S, the first voltage division signal, the second voltage division signal and the on-time signal of the switching period of the active power switch S;
a second error amplifier for calculating an error value of the output current signal according to the received reference current signal and outputting an error current signal;
the second compensator is used for providing a relative opposite change value for the error current signal and converting the error current signal into an input signal of a pulse width modulation generator;
a pulse width modulation generator for comparing an input signal of the pulse width modulation generator with a ramp signal to generate a pulse width modulation signal;
and the carrier wave generator is used for providing a ramp signal for the pulse width modulation generator.
7. The series active power filter of claim 6, wherein the pulse width modulation generator receives a current signal of an active power switch, the first voltage divided signal, the second voltage divided signal, and an on-time signal of a switching cycle of the active power switch, wherein the current signal of the active power switch comprises a first current signal CTA, a second current signal CTB;
and calculating the received current signal of the active power switch, the first voltage division signal, the second voltage division signal and the on-time signal of the switching period of the active power switch by using the falling slope of the current of the inductor L1 in each switching period in the switching S turn-off period to obtain the average value of the current of the inductor L1, and outputting the average value of the current of the inductor L1 as an output current signal to the second error amplifier.
8. The series active power filter as claimed in claim 7, wherein the pulse width modulation generator inputs the pulse width modulation signal to a gate of the active power switch S.
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| CN113991990A (en) * | 2021-12-28 | 2022-01-28 | 深圳市永联科技股份有限公司 | Method and device for adjusting switching power supply |
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| CN112054525B (en) | 2022-09-30 |
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