CN101964529A - DSP (Digital Signal Processor) based improved instantaneous detection and control system of cascaded active power filter - Google Patents
DSP (Digital Signal Processor) based improved instantaneous detection and control system of cascaded active power filter Download PDFInfo
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Abstract
The invention relates to a DSP (Digital Signal Processor) based improved instantaneous detection and control system of a cascaded active power filter. The system comprises a signal shaping and transformation processing circuit, a central data processing circuit, an insulating and driving circuit and a gate turn off thyristor circuit. The system proposes an improved instantaneous detection method based on a dq transformational theory, and fundamental wave positive-sequence components of voltage and current are synchronously extracted through dq transformation; and through coordinate transformation and projection, a current fundamental wave positive-sequence active component is obtained, and three-phase voltage distortion and fundamental wave positive-sequence active current while asymmetry can be detected in real time. In the invention, a high-performance digital signal processing chip is utilized to control a cascaded multi-level active power compensator, thereby the control speed and precision are greatly improved, the device capacity and the voltage class are improved, the stability of the grid is enhanced, and the influence on the running of whole system due to harmonic pollution is avoided.
Description
[technical field]
The invention belongs to electric power system tandem type Active Power Filter-APF (Active Power Filter, APF) Detection ﹠ Controling technical field, relate to a kind of based on digital signal processor (digital signal processor, tandem type Active Power Filter-APF Detection ﹠ Controling system DSP).
[background technology]
Active Power Filter-APF is a kind of power electronics bucking-out system, is connected between power supply and the important load, has good dynamic property and harmonic characterisitic.Active Power Filter-APF can be regarded a controlled current source as, its basic functional principle is that the contained humorous reactive current that involves in the system is detected, and produce offset current with 180 ° of its equal and opposite in directions, phase difference, inject transmission line, the counteracting humorous reactive current that involves wherein.The i of extensive use at present
p-i
qThough detection method can detect harmonic current exactly under imperfect line voltage, can not detect reactive current exactly, its reason is when line voltage is asymmetric, the actual zero crossing and the voltage fundamental zero crossing of voltage have phase difference.And all have in various degree distortion and asymmetric under the actual a lot of situations of grid voltage waveform.
[summary of the invention]
The objective of the invention is to overcome the prior art above shortcomings, provide a kind of tandem type Active Power Filter-APF to improve instantaneous Detection ﹠ Controling system based on DSP.
The present invention proposes the improvement instantaneous detection method based on the dq transformation theory, extract the fundamental positive sequence of voltage and current synchronously by the dq conversion, thereby draw current first harmonics positive sequence real component through coordinate transform, projection, can be real-time detect the three-phase voltage distortion and fundamental positive sequence active current when asymmetric.
Tandem type Active Power Filter-APF based on DSP provided by the invention improves instantaneous Detection ﹠ Controling system, uses DSP and realizes improving instantaneous detection method, and this system comprises,
Signal shaping conversion process circuit: input connects the voltage transformer summation current transformer of external circuit, and its output connects the input of central data treatment circuit, is used for signals collecting and level conversion;
The central data treatment circuit: output connects isolates and drive circuit, is used for realizing improving the needed calculating of instantaneous detection method;
Isolate and drive circuit: output is connected each IGBT gate pole input of gate level turn-off thyristor circuit, is used for driving pulse and generates;
Gate level turn-off thyristor circuit: be used for inversion and produce offset current.
Above-mentioned said signal shaping conversion process circuit is made of voltage, electric current AC sampling front-end circuit and frequency square wave translation circuit; After handling voltage, the current signal gathered, voltage, electric current AC sampling front-end circuit send into the A/D module input in the central data treatment circuit; Frequency square wave translation circuit is transformed to square-wave signal with voltage signal and is input to capture module input in the central data treatment circuit.
Above-mentioned said voltage, electric current AC sampling front-end circuit constitute the input saturation protection with first to fourth diode, with first to the 6th resistance, and first to fourth electric capacity formation instrument transformer phase shift compensation and rc filter circuit; Said frequency square wave translation circuit constitutes the hysteresis voltage comparator with the 7th to the tenth resistance and comparator LM339, constitute bleeder circuit with the 11 to the 12 resistance, the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
Above-mentioned said improvement instantaneous detection method is that voltage, current signal that signal shaping conversion process circuit obtains are carried out coordinate transform by the central data treatment circuit, obtain its DC component by low pass filter again, by the central data treatment circuit voltage and current dc component are carried out that vector is synthetic, vector projection calculates, obtain the command signal of electric current again through the coordinate inverse transformation, signal is outputed to from central data processing circuit isolate and drive circuit.
Above-mentioned said central data treatment circuit comprises: dsp chip, power management module, crystal oscillating circuit and data/address bus drive circuit; Set various executive conditions control dsp chips the input signal of data bus driving circuits is carried out identification, handles and send relevant control command according to the above-mentioned software program of compiling; Power management module is responsible for providing electric energy; Crystal oscillating circuit provides clock signal to dsp chip; The data/address bus drive circuit mainly is responsible for data buffering and level conversion.
Above-mentioned said dsp chip comprises big capacity flash memory, a plurality of 32 bit timing devices, 2 task managers and SPI, SCI, CAN multiple interfaces, and nearly 16 tunnel PWM control wave can be provided.
Above-mentioned said gate level turn-off thyristor circuit comprises: 4 bridge-types in the single-phase loop connect the IGBT unit; Their control signal is come self-isolation and drive circuit.
Operation principle of the present invention:
Signal shaping conversion process circuit is transformed to transmission line voltage transformer secondary side voltage and current sensors secondary side current than the low amplitude value alternating voltage, and being sent to after the processing with DSP is in the central data treatment circuit of core.During operate as normal, APF is according to the instantaneous value of system voltage and electric current, calculate the trigger angle of power circuit according to improved instantaneous detection method by the central data treatment circuit, provide inverter control pwm signal, after amplifying, triggers by the pulse amplifying circuit relevant IGBT unit, the output offset current, the suppression system harmonic wave.
Advantage of the present invention and beneficial effect:
1, adopt improved instantaneous detection method, can be real-time detect the three-phase voltage distortion and fundamental positive sequence active current when asymmetric; 2, utilize the high performance digital signal process chip to realize the control of active electric power compensator, improve the speed and the precision of control to a great extent, the control hysteresis and the precision defective that reduce the restriction of common simulation modulation system and single-chip microcomputer processing speed and cause make The whole control system have good adjusting function and reliability; 3, adopt the main circuit topological structure of Cascade H bridge circuit, improved installed capacity and electric pressure greatly, strengthened the stability of electrical network, avoid influencing the operation of whole system because of harmonic pollution as APF; 4, has wide market application prospect.
[description of drawings]
Fig. 1 improves the overall structure schematic diagram of instantaneous Detection ﹠ Controling system for the related active electric power compensator based on DSP of the present invention.
Fig. 2 improves signal shaping conversion process electrical block diagram in the instantaneous Detection ﹠ Controling system for the related active electric power compensator based on DSP of the present invention.
Fig. 3 improves central data treatment circuit structural representation in the instantaneous Detection ﹠ Controling system for the related active electric power compensator based on DSP of the present invention.
Fig. 4 improves improved instantaneous detection method structural representation in the instantaneous Detection ﹠ Controling system for the related active electric power compensator based on DSP of the present invention.
Fig. 5 improves the single phase circuit of the gate level turn-off thyristor circuit in the instantaneous Detection ﹠ Controling system for the related active electric power compensator based on DSP of the present invention.
[embodiment]
Embodiment:
A kind of cascade 11 level active power filters based on DSP improve instantaneous Detection ﹠ Controling system (see figure 1), it is a central processing unit with the high performance DSP TMS320F2812 that Texas Instruments releases, whole system is made up of with drive circuit and gate level turn-off thyristor circuit signal shaping conversion process circuit, central data treatment circuit, isolation, has realized improved instantaneous detection method.The input of wherein said signal shaping conversion process circuit connects the voltage transformer summation current transformer of external circuit, its output connects the input of central data treatment circuit, the output of central data treatment circuit connects isolates and drive circuit, and isolation is connected each IGBT gate pole input of gate level turn-off thyristor circuit with the output of drive circuit.
Above-mentioned said signal shaping conversion process circuit is made of voltage, electric current AC sampling front-end circuit and frequency square wave translation circuit; After handling voltage, the current signal gathered, voltage, electric current AC sampling front-end circuit send into the A/D module input in the central data treatment circuit; Frequency square wave translation circuit is transformed to square-wave signal with voltage signal and is input to capture module input in the central data treatment circuit.
Above-mentioned said voltage, electric current AC sampling front-end circuit (see figure 2) constitute the input saturation protection with first to fourth diode D11, D12, D21, D22, with first to the 6th resistance R 24, R25, R26, R34, R35, R36, and first to fourth capacitor C 11, C12, C16, C17 formation instrument transformer phase shift compensation and rc filter circuit; Said frequency square wave translation circuit constitutes the hysteresis voltage comparator with the 7th to the tenth resistance R 1, R2, R4, R5 and comparator LM339, constitute bleeder circuit with the 11 to the 12 resistance R 7, R8, the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
Above-mentioned said central data treatment circuit comprises: dsp chip, power management module, crystal oscillating circuit and data/address bus drive circuit; Set various executive conditions control dsp chips according to improved instantaneous detection method principle software program that (see figure 4) is compiled the input signal of data bus driving circuits is carried out identification, handles and send relevant control command; Power management module is responsible for providing electric energy; Crystal oscillating circuit provides clock signal to dsp chip; The data/address bus drive circuit mainly is responsible for data buffering and level conversion.
Above-mentioned said dsp chip (see figure 3) comprises big capacity flash memory, a plurality of 32 bit timing devices, 2 task managers and SPI, SCI, CAN multiple interfaces, and 12 road required PWM control waves are provided; Power management module is made of dual power supply device TPS73HD301 and peripheral resistance R 15, R16, capacitor C 1, C2; Crystal oscillating circuit is made of the capacitor C 3 that clock signal is provided to dsp chip, C4 and crystal oscillator body U2.The data/address bus drive circuit is made of a slice bidirectional data buffer device 74LVC16245; This circuit working process is: after the digital quantity that A/D is transformed gained receives DSP, to data compensate, behind the digital filtering, corresponding corresponding standard value is converted into per unit value, computing draws pilot angle, and the conversion count value, produce 4 (three-phase amount to 12) different control impuls (+A1 ,-A1 ,+A2 ,-A2).
Above-mentioned said improvement instantaneous detection method (see figure 4) is that voltage, current signal that signal shaping conversion process circuit obtains are carried out coordinate transform by the central data treatment circuit, obtain its DC component by low pass filter again, by the central data treatment circuit voltage and current dc component are carried out that vector is synthetic, vector projection calculates, obtain the command signal of electric current again through the coordinate inverse transformation, signal is outputed to from central data processing circuit isolate and drive circuit.
Above-mentioned said gate level turn-off thyristor circuit (see figure 5) comprises: four IGBT unit in the single phase alternating current (A.C.) loop, this circuit working process is: control impuls is from through the signal after the power drive pipe circuit processing and amplifying, 4 IGBT unit G1, G2, G3 and G4 in the circuit, the signal that receives from power drive pipe circuit according to certain time sequence is triggered.
Claims (7)
1. the tandem type Active Power Filter-APF based on DSP improves instantaneous Detection ﹠ Controling system, it is characterized in that this system comprises,
Signal shaping conversion process circuit: input connects the voltage transformer summation current transformer of external circuit, and its output connects the input of central data treatment circuit, is used for signals collecting and level conversion;
The central data treatment circuit: output connects isolates and drive circuit, is used for realizing improving the needed calculating of instantaneous detection method;
Isolate and drive circuit: output is connected each IGBT gate pole input of gate level turn-off thyristor circuit, is used for driving pulse and generates;
Gate level turn-off thyristor circuit: be used for inversion and produce offset current.
2. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator of claim 1 based on DSP, the detailed process that it is characterized in that said improvement instantaneous detection method is: the voltage that signal shaping conversion process circuit is obtained, current signal carries out coordinate transform by the central data treatment circuit, obtain its DC component by low pass filter again, it is synthetic by the central data treatment circuit voltage and current dc component to be carried out vector, vector projection calculates, obtain the command signal of electric current again through the coordinate inverse transformation, signal is outputed to from central data processing circuit isolate and drive circuit.
3. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator of claim 1, it is characterized in that said signal shaping conversion process circuit is made of voltage, electric current AC sampling front-end circuit and frequency square wave translation circuit based on DSP; Link to each other with A/D module input in the central data treatment circuit by voltage, electric current AC sampling front-end circuit, after wherein voltage AC sampling front-end circuit connects frequency square wave translation circuit, link to each other with capture module input in the central data treatment circuit again, send into the A/D module input in the central data treatment circuit after voltage, electric current AC sampling front-end circuit are handled voltage, the current signal gathered; Frequency square wave translation circuit is transformed to square-wave signal with voltage signal and is input to capture module input in the central data treatment circuit.
4. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator of claim 3 based on DSP, it is characterized in that said voltage, electric current AC sampling front-end circuit constitute the input saturation protection with first to fourth diode, with first to the 6th resistance, and first to fourth electric capacity formation instrument transformer phase shift compensation and rc filter circuit; Said frequency square wave translation circuit constitutes the hysteresis voltage comparator with the 7th to the tenth resistance and comparator LM339, constitute bleeder circuit with the 11 to the 12 resistance, the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
5. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator of claim 1, it is characterized in that said central data treatment circuit comprises: dsp chip, power management module, crystal oscillating circuit and data/address bus drive circuit based on DSP; Set various executive conditions control dsp chips according to software program that claim 2 is compiled the input signal of data bus driving circuits is carried out identification, handles and send relevant control command; Power management module is responsible for providing electric energy; Crystal oscillating circuit provides clock signal to dsp chip; The data/address bus drive circuit mainly is responsible for data buffering and level conversion.
6. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator of claim 5 based on DSP, it is characterized in that said dsp chip, comprise big capacity flash memory, a plurality of 32 bit timing devices, 2 task managers and SPI, SCI, CAN multiple interfaces, nearly 16 tunnel PWM control wave can be provided.
7. improve instantaneous Detection ﹠ Controling system according to the said active electric power compensator based on DSP of claim 1, it is characterized in that said gate level turn-off thyristor circuit comprises: 4 IGBT unit in the single-phase loop adopt bridge-types to connect; Their control signal is come self-isolation and drive circuit.
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Cited By (6)
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|---|---|---|---|---|
| CN102830268A (en) * | 2012-08-31 | 2012-12-19 | 天津理工大学 | DSP (Digital Signal Processor) and SAPF (Shunt Active Power Filter)-based real-time phase shift detection system and working method thereof |
| CN102832620A (en) * | 2012-08-31 | 2012-12-19 | 天津理工大学 | System and method for harmonic detection and control of APF (active power filter) based on windowed all-phase FFT (fast Fourier transform) |
| CN104698257A (en) * | 2013-12-09 | 2015-06-10 | 长沙理工大学 | Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation |
| CN108847683A (en) * | 2018-06-26 | 2018-11-20 | 沈阳工业大学 | Asymmetrical component detection and cancellation element and the method for more level photovoltaic inverters |
| CN113098238A (en) * | 2021-04-07 | 2021-07-09 | 岳阳东瑞电气有限公司 | Digital accurate three-phase synchronous signal acquisition and phase-shifting triggering method |
| CN115167606A (en) * | 2022-06-22 | 2022-10-11 | 清华大学 | Drive chip of turn-off device and control method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830268A (en) * | 2012-08-31 | 2012-12-19 | 天津理工大学 | DSP (Digital Signal Processor) and SAPF (Shunt Active Power Filter)-based real-time phase shift detection system and working method thereof |
| CN102832620A (en) * | 2012-08-31 | 2012-12-19 | 天津理工大学 | System and method for harmonic detection and control of APF (active power filter) based on windowed all-phase FFT (fast Fourier transform) |
| CN102830268B (en) * | 2012-08-31 | 2015-08-05 | 天津理工大学 | The real-time phase shift detection system of a kind of SAPF based on DSP and method of work thereof |
| CN104698257A (en) * | 2013-12-09 | 2015-06-10 | 长沙理工大学 | Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation |
| CN104698257B (en) * | 2013-12-09 | 2017-07-04 | 长沙理工大学 | Polyphase circuit broad sense harmonic Instantaneous Symmetrical Components change detection method |
| CN108847683A (en) * | 2018-06-26 | 2018-11-20 | 沈阳工业大学 | Asymmetrical component detection and cancellation element and the method for more level photovoltaic inverters |
| CN108847683B (en) * | 2018-06-26 | 2023-10-27 | 沈阳工业大学 | Asymmetric component detection and elimination device and method for multi-level photovoltaic inverter |
| CN113098238A (en) * | 2021-04-07 | 2021-07-09 | 岳阳东瑞电气有限公司 | Digital accurate three-phase synchronous signal acquisition and phase-shifting triggering method |
| CN115167606A (en) * | 2022-06-22 | 2022-10-11 | 清华大学 | Drive chip of turn-off device and control method thereof |
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Application publication date: 20110202 |