CN102222931A - Microgrid three-phase grid-connected inverter system and control method thereof - Google Patents
Microgrid three-phase grid-connected inverter system and control method thereof Download PDFInfo
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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
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Abstract
The invention relates to a microgrid three-phase grid-connected inverter system which comprises a main circuit DSP (Digital Signal Processor) system, two groups of AC (Alternate Current) mutual inductors, a group of DC (Direct Current) mutual inductor, a group of data acquisition conversion module, a group of DC data acquisition module, a group of temperature sensor and a group of IGBT (Insulated Gate Bipolar Transistor) driving module. The three-phase inverter system has the capability of adapting to independent operation and grid-connected operation. The three-phase inverter system with double grid-connected/independent modes is realized. Before a grid is connected, an output voltage tracks an amplitude and a phase position of a voltage of the power grid and the phase position and the amplitude of a load voltage before the grid is disconnected are used as voltage references at the moment that the grid is disconnected, so that the inverter system realizes seamless switch in the process of switching the working modes and the technical problem that the independent inverter system has no capability of grid connection is solved.
Description
Technical field
The present invention relates in solar power generation in little electrical network, the wind power generation process direct current energy is reverse into the process that interchange is incorporated into the power networks, especially relate to a kind of little electrical network three-phase grid-connected inverting system and control method thereof.
Background technology
In recent years, generation of electricity by new energy devices such as solar energy, wind energy are followed the reduction of its manufacturing cost and the increasing of promotion efficiency, and its application is developed fast.Begun by the additional energy to the alternative energy source transition, simultaneously by the middle low power stand alone generating system of supplying with areas without electricity to large-scale grid-connected system transition.These energy have played support and compensating action as distributed generation system to electrical network, and along with economic development, power consumption constantly strengthens, and peak of power consumption electrical network in period can not satisfy the power supply needs, and this has also promoted the development of distributed power generation.When especially extreme accident takes place in electrical network---" islet operation ", distributed power source can play positive support effect to power distribution network, guarantees the continuity and the reliability of important load power supply in the power distribution network.
Power supply in the distributed generation system has the two kinds of mode of operations of independently generating electricity and generate electricity by way of merging two or more grid systems usually.Generally when for areas without electricity power supply or power supply area appearance " islet operation ", distributed power source is operated in independent operation mode.When distributed power source and power supply area mixed running, then operate in the pattern of being incorporated into the power networks, except guaranteeing local load operate as normal, can also give electrical network unnecessary power delivery, to utilize the energy expeditiously.
Inverter is as the core component of distributed power source electricity generation grid-connecting, and the three-phase inversion grid-connecting apparatus generally adopts the pure sine wave feeding technique that is incorporated into the power networks, be about to that inverter will be incorporated into the power networks that input current is controlled to be and electrical network with frequently, the sine wave of homophase, realize unity power factor.Because being incorporated into the power networks and the handoff procedure complexity between network operation of three-phase inverter, be easy to generate impulse current and voltage, so generally all be to be incorporated into the power networks or,, become the task of top priority so how effectively to solve being incorporated into the power networks of three-phase grid-connected inverter/seamlessly transit problem from net from the network operation pattern.
The present invention is from the electrical network demand, realization be incorporated into the power networks separate double pattern three-phase inversion system, by before being incorporated into the power networks, make output voltage follow the tracks of the amplitude and the phase place of line voltage, the load voltage phase-amplitude is as voltage reference before suspension is adopted suspension constantly, realizes that this inversion system realizes seamless switching in the working mode change process.
Summary of the invention
Technical problem to be solved by this invention provides a kind of little electrical network three-phase grid-connected inverting system and control method, realizes finishing three-phase inversion when distributed power source is incorporated into the power networks and the control procedure that is incorporated into the power networks, have simultaneously be incorporated into the power networks separate double pattern three-phase inversion function.
For solving the problems of the technologies described above, the invention provides a kind of little electrical network three-phase grid-connected inverting system, it is characterized in that comprising:
A main circuit, comprise the distributed DC power supply, the DC chopped-wave booster circuit, filter capacitor, inverter circuit, filter inductor, boosting inverter, the distributed DC power supply provides required direct current energy, realize DC/DC through the DC chopped-wave booster circuit for improving the inversion system energy conversion efficiency, eliminate interference through filter capacitor, three-phase full-controlled bridge IGBT is partly adopted in the filter capacitor inversion, realization is reverse into three-phase AC to the DC after boosting, filter inductor, make the three-phase current waveform after the inversion more level and smooth, step-up transformer is realized the coupling of inverter output voltage and line voltage, and final the realization is incorporated into the power networks;
A dsp system, be used for the operational system control program, improve the hysteresis current algorithm, and will carry out operational analysis to the various digital quantities that AD changes up, and according to analysis result to image data, to IGBT drive circuit issue driving command, and voltage, electric current, frequency parameter be sent to display module, simultaneously data are sent to host computer by communication module and receive the control command that host computer is assigned, and according to each parameter logical relation computing this inverter be incorporated into the power networks realize seamless switching in the independent working mode transfer process;
2 groups of D.C mutual-inductors comprise 3 current transformers and 3 voltage transformers, are used for gathering inversion system three-phase output current and grid side three-phase voltage parameter;
2 groups of direct current instrument transformers comprise 2 Hall voltage instrument transformers and 2 Hall current instrument transformers, are used to gather the voltage and current parameter of DC side;
1 group of data acquisition modular converter comprises filter circuit, amplitude adjustment circuit, limiter protection circuit and change-over circuit, and filter circuit adopts low pass filter, and the high-frequency signal that filtering is unnecessary is eliminated the interference of high-frequency signal to Acquisition Circuit; It is that the signal that will export after the filtering adds the bigoted voltage in center that amplitude is adjusted circuit, makes it satisfy the input requirement of A/D conversion chip; Limiter protection circuit is for anti-stop signal causes signal amplitude excessive owing to cause of failures generation kick, surpasses full input range, causes the A/D conversion chip to burn, and then damages Acquisition Circuit and subsequent conditioning circuit; Change-over circuit contains two 12 A/D converters of working simultaneously, and corresponding 3 the difference input channels of each transducer are sampled simultaneously, changed, and keep the synchronous acquisition of every phase voltage and electric current;
2 groups of data detection module are gathered the current signal and the voltage signal of direct current source, and are sent to the ADC modular converter of control chip, for control system the flying power of power supply are made assessment;
1 group of temperature sensor is used to gather the temperature of IGBT module, and data are sent to protection module, in case exceed the upper limit that protection module is set, protection module sends instruction to DSP, carries out emergency treatment, turn-offs drive circuit;
1 group of IGBT driver module is realized quick, reliable soft shutoff when being used for short circuit overcurrent, have the photoelectricity isolation features, feeds back to control system when breaking down fast, controls in real time and monitors for control system.
The IGBT driver module is made up of photoelectric isolating circuit, drive circuit, protective circuit, and photoelectric isolating circuit guarantees the electrical isolation between control end and the drive end; Drive circuit is realized bigger dynamic current driving force; Realize quick, reliable soft shutoff when protective circuit has short circuit overcurrent, when breaking down, feed back to control system fast, control in real time and monitor for control system.
Voltage transformer is installed in grid side, current transformer is installed in the outlet of distributed power source, be divided into three groups, gather A phase, B phase, C phase voltage and electric current respectively, voltage transformer summation current transformer secondary side inserts the interchange collection terminal of data acquisition modular converter, the direct current Hall element is connected on distributed power source outlet side and inverter direct-flow side respectively, sends detecting the signal that comes up into the direct current collection terminal of data acquisition modular converter then.
Control method of the present invention comprises the control of three-phase software phase-lock loop and improves hysteresis current control, at first by coordinate transform with three phase static coordinate system (a, b, c) convert two-phase rest frame (α to, β) rotate to (d that rotates synchronously with the electrical network fundamental frequency again, q) coordinate system, after conversion, first-harmonic sinusoidal variable in the three symmetrical rest frames will change into the direct current variable in the synchronous rotating frame, after conversion, become the dq model of three-phase inverter, improve the current loop control of hysteresis current control method realization by adopting then to inverter, eliminate electric current out of control, reduce the switching tube switching frequency.
Wherein the control of three-phase software phase-lock loop comprises the following steps:
(1) initialization;
(2) image data;
(3) AD conversion is changed gathering the data of coming up;
(4) judging whether and need be incorporated into the power networks, if carry out 5, is not then to carry out 6;
(5) with the three phase static coordinate system (a, b, c) convert to the two-phase rest frame (α, β);
(6) coordinate system after will changing rotates to electrical network fundamental frequency (d, q) coordinate system of rotation synchronously again;
(7) (α β) carries out the Clark conversion with the two-phase rest frame;
(8) will with the rotation synchronously of electrical network fundamental frequency (d, q) coordinate system carries out the Pack conversion;
(9) the three-phase symmetric voltage waveform is carried out earlier the Clark conversion, carry out the Pack conversion again;
(10) supposition
Amplitude is constant,
Projection at the q axle is promptly reacted
Relation with the d axle;
(11), when Ud 〉=0, strengthen synchronous signal frequency by adjusting synchronous signal frequency;
(12) when Ud≤0, reduce synchronous signal frequency;
(13) when realizing U
d=0 o'clock, carry out software locks and control mutually, and execution (15);
(14) produce U
dSoftware locks was controlled required synchronous signal frequency mutually in=0 o'clock, and execution (15);
(15) repeat (3).
Improving hysteresis current control comprises the following steps:
(1) initialization;
(2) voltage, current acquisition;
(3) A/D conversion becomes analog signal conversion digital signal and is sent to DSP;
(4) the phase-locked electrical network phase place that obtains of software;
(5) through 3/2 phase coordinates conversion;
(6) it is given as electric current loop to contain the electrical network phase angle information;
(7) current signal after the conversion and primary current relatively draw error signal;
(8) error is sent to hysteresis comparator;
(9) upper limit of setting hysteresis comparator;
(10) two ring widthes that differ in size are set, the upper limit of the big nearly hysteresis comparator of articulating guarantees current stabilization in the ring width limited field, and little ring width H regulates automatically with the size of compensation rate, but the change width of little ring will be in the limit range of big ring; When detecting electric current and exceed given ring width, adjust little ring width, increase the switching tube frequency, make electric current in the scope of the ring width of little ring, when electric current surmounts big circumpolar limit, enter guard mode.
(11) repeat (2), continue Control current.
The present invention has possessed independent operating and the adaptive ability that is incorporated into the power networks, realization be incorporated into the power networks separate double pattern three-phase inversion, by before being incorporated into the power networks, make output voltage follow the tracks of the amplitude and the phase place of line voltage, the load voltage phase-amplitude is as voltage reference before suspension is adopted suspension constantly, realize that this inversion system realizes seamless switching in the working mode change process, solved the technical problem that independent inverter can not be incorporated into the power networks.
Description of drawings
Fig. 1 is system's composition diagram;
Fig. 2 is a three-phase software phase-lock loop control flow chart;
Fig. 3 improves the hysteresis current control flow chart;
Fig. 4 is system works flow process figure.
Embodiment
With reference to Fig. 1, main circuit comprises distributed DC power supply, DC chopped-wave booster circuit, filter capacitor, inverter circuit, filter inductor, boosting inverter, the required direct current energy of providing of inverter is provided the distributed DC power supply, realizes DC/DC through the DC chopped-wave booster circuit for improving the inverter energy conversion efficiency; Three-phase full-controlled bridge IGBT is partly adopted in inversion, realizes the DC after boosting is reverse into three-phase AC; Filter inductor makes the three-phase current waveform after the inversion more level and smooth; Step-up transformer, the coupling of realization inverter output voltage and line voltage, the final realization is incorporated into the power networks.
2 groups of D.C mutual-inductors comprise 3 current transformers and 3 voltage transformers, are used for gathering parameters such as inversion system three-phase output current and grid side three-phase voltage, are sent to the data acquisition modular converter;
The data acquisition modular converter comprises filter circuit, amplitude modulate circuit, limiter protection circuit and modular converter, and filter circuit adopts low pass filter, and the high-frequency signal that filtering is unnecessary is eliminated the interference of high-frequency signal to Acquisition Circuit; The amplitude modulate circuit is that the signal that will export after the filtering adds the bigoted voltage in center, makes it satisfy the input requirement of A/D conversion chip; Limiter protection circuit be for anti-stop signal owing to reason generation kicks such as interferences cause signal amplitude excessive, surpass full input range, cause the A/D conversion chip to burn, and then damage Acquisition Circuit and subsequent conditioning circuit; Change-over circuit contains two 12 A/D converters of working simultaneously, and (A0/A1, B0/B1 C0/C1), sample, change corresponding 3 the difference input channels of each transducer simultaneously, keep the synchronous acquisition of every phase voltage and electric current.For the accuracy that guarantees to be incorporated into the power networks, must guarantee that also the inverter current and the line voltage of homophase carry out synchronized sampling.The data of gathering after changing are sent to the DSP control system.
2 groups of direct current instrument transformers, comprise 2 Hall voltage instrument transformers and 2 Hall current instrument transformers, the voltage and current parameter that is used to gather DC side is sent to the ADC modular converter of control chip through data detection module, for control system the flying power of power supply is made assessment.
1 group of temperature sensor is used to gather the temperature of IGBT module, and data are sent to protection module, in case exceed the upper limit that protection module is set, protection module sends instruction to DSP, carries out emergency treatment, turn-offs drive circuit.
A DSP (TMS320LF2812) system, be used for the operational system control program, improve the hysteresis current algorithm, and will carry out operational analysis to the various digital quantities that AD changes up, and according to analysis result to image data, to IGBT drive circuit issue driving command, this driving has bigger dynamic current driving force, realize quick, reliable soft shutoff during short circuit overcurrent, has the photoelectricity isolation features, having when breaking down feeds back to control system fast, controls in real time and monitors for control system.And parameters such as voltage, electric current, frequency are sent to display module.Simultaneously data are sent to host computer by communication module and receive the control command that host computer is assigned, and according to each parameter logical relation computing realize this inverter be incorporated into the power networks realize seamless switching in the independent working mode transfer process.
The IGBT driver module is made up of photoelectric isolating circuit, drive circuit, protective circuit, and photoelectric isolating circuit guarantees the electrical isolation between control end and the drive end; Drive circuit is realized bigger dynamic current driving force; Realize quick, reliable soft shutoff when protective circuit has short circuit overcurrent, when breaking down, feed back to control system fast, control in real time and monitor for control system.
With reference to Fig. 2, wherein the control of three-phase software phase-lock loop comprises the following steps:
101 initialization;
102 image data;
The 103AD conversion is changed gathering the data of coming up;
104 judge whether and need be incorporated into the power networks, if carry out 105, are not then to carry out 114;
105 with the three phase static coordinate system (a, b, c) convert to the two-phase rest frame (α, β);
106 coordinate systems after will changing rotate to electrical network fundamental frequency (d, q) coordinate system of rotation synchronously again;
107 will with the rotation synchronously of electrical network fundamental frequency (d, q) coordinate system carries out the Pack conversion;
108 carry out the three-phase symmetric voltage waveform earlier the Clark conversion, carry out the Pack conversion again;
109 supposition
Amplitude is constant,
Projection at the q axle is promptly reacted
Relation with the d axle;
110 by adjusting synchronous signal frequency, when Ud 〉=0, strengthens synchronous signal frequency;
111 when Ud≤0, reduces synchronous signal frequency;
112 when realizing U
d=0 o'clock, carry out software locks and control mutually, and execution (114);
113 produce U
dSoftware locks was controlled required synchronous signal frequency mutually in=0 o'clock, and execution (114);
114 realizations are phase-locked, repeat (103).
With reference to Fig. 3, improve hysteresis current control and comprise the following steps:
201 initialization;
202 voltages, current acquisition;
The 203A/D conversion becomes analog signal conversion digital signal and is sent to DSP;
The phase-locked electrical network phase place that obtains of 204 softwares;
205 through 3/2 phase coordinates conversion;
206 will to contain the electrical network phase angle information given as electric current loop;
Current signal after 207 conversion and primary current relatively draw error signal;
208 errors are sent to hysteresis comparator;
209 set the upper limit of hysteresis comparator;
210 are provided with two ring widthes that differ in size, and the upper limit of the big nearly hysteresis comparator of articulating guarantees current stabilization in the ring width limited field, and little ring width H regulates automatically with the size of compensation rate, but the change width of little ring will be in the limit range of big ring; When detecting electric current and exceed given ring width, adjust little ring width, increase the switching tube frequency, make electric current in the scope of the ring width of little ring, when electric current surmounts big circumpolar limit, enter guard mode.
211 repeat (202), continue Control current.
With reference to Fig. 4, the system works flow process is as follows:
301 system initializations;
302 gather alternating voltage, current signal;
303 gather direct voltage, current signal;
After the data that the 304 pairs of collections come up are handled, convert thereof into digital signal for DSP identification;
305 enter the main circulating program module;
306 give communication module with system status information;
307 give display module with system status information;
308 according to system's computing situation, sends the SPWM ripple;
309 cycle detection interrupt conditions in case take place to interrupt protection, enter and interrupt the protection subprogram;
310 repeat (302).
Claims (7)
1. little electrical network three-phase grid-connected inverting system is characterized in that comprising:
A main circuit, comprise the distributed DC power supply, the DC chopped-wave booster circuit, filter capacitor, inverter circuit, filter inductor, boosting inverter, the distributed DC power supply provides required direct current energy, realize DC/DC through the DC chopped-wave booster circuit for improving the inversion system energy conversion efficiency, eliminate interference through filter capacitor, three-phase full-controlled bridge IGBT is partly adopted in the filter capacitor inversion, realization is reverse into three-phase AC to the DC after boosting, filter inductor, make the three-phase current waveform after the inversion more level and smooth, step-up transformer is realized the coupling of inverter output voltage and line voltage, and final the realization is incorporated into the power networks;
A dsp system, be used for the operational system control program, improve the hysteresis current algorithm, and will carry out operational analysis to the various digital quantities that AD changes up, and according to analysis result to image data, to IGBT drive circuit issue driving command, and voltage, electric current, frequency parameter be sent to display module, simultaneously data are sent to host computer by communication module and receive the control command that host computer is assigned, and according to each parameter logical relation computing this inverter be incorporated into the power networks realize seamless switching in the independent working mode transfer process;
2 groups of D.C mutual-inductors comprise 3 current transformers and 3 voltage transformers, are used for gathering parameters such as inverter three-phase output current and grid side three-phase voltage;
2 groups of direct current instrument transformers comprise 2 Hall instrument transformers and 2 Hall current instrument transformers, are used to gather the voltage and current parameter of DC side;
1 group of data acquisition modular converter comprises filter circuit, amplitude adjustment circuit, limiter protection circuit and change-over circuit, and filter circuit adopts low pass filter, and the high-frequency signal that filtering is unnecessary is eliminated the interference of high-frequency signal to Acquisition Circuit; It is that the signal that will export after the filtering adds the bigoted voltage in center that amplitude is adjusted circuit, makes it satisfy the input requirement of A/D conversion chip; Limiter protection circuit is for anti-stop signal causes signal amplitude excessive owing to cause of failures generation kick, surpasses full input range, causes the A/D conversion chip to burn, and then damages Acquisition Circuit and subsequent conditioning circuit; Change-over circuit contains two 12 A/D converters of working simultaneously, and corresponding 3 the difference input channels of each transducer are sampled simultaneously, changed, and keep the synchronous acquisition of every phase voltage and electric current;
2 groups of data detection module are gathered the current signal and the voltage signal of direct current source, and are sent to the ADC modular converter of control chip, for control system the flying power of power supply are made assessment;
1 group of temperature sensor is used to gather the temperature of IGBT module, and data are sent to protection module, in case exceed the upper limit that protection module is set, protection module sends instruction to dsp system, carries out emergency treatment, turn-offs drive circuit;
1 group of IGBT driver module is realized quick, reliable soft shutoff when being used for short circuit overcurrent, have the photoelectricity isolation features, feeds back to control system when breaking down fast, controls in real time and monitors for control system.
2. a kind of little electrical network three-phase grid-connected inverting system according to claim 1, it is characterized in that: dsp system comprises power module, passive crystal oscillator module, memory module, I/O interface, ADC acquisition module, display module and communication module, power module is used to minimum system that stable working power is provided, and the system that guarantees simultaneously has stronger anti-interference; Passive crystal oscillator module provides the frequency of oscillation of stable 15MHz for system; Memory module provides data storage and stored program program storage that can supply storage for system; The I/O interface has the function of digital quantity transmission and controlled quentity controlled variable transmission; After the ADC acquisition module is used for DC quantity that the Hall instrument transformer is gathered up collection comes up through testing circuit, give ADC acquisition module, discern by DSP after converting digital quantity to; Display module is used for voltage, electric current, frequency parameter shown for technology/attendant understands running situation and information at any time; Communication module is used for data are sent to host computer by communication module and receive the control command that host computer is assigned, and protection module is used for information such as the temperature, electric current of monitoring system, in case line is protected system immediately more.
3. a kind of little electrical network three-phase grid-connected inverting system according to claim 1, it is characterized in that: the IGBT driver module is made up of photoelectric isolating circuit, drive circuit, protective circuit, and photoelectric isolating circuit guarantees the electrical isolation between control end and the drive end; Drive circuit is realized bigger dynamic current driving force; Realize quick, reliable soft shutoff when protective circuit has short circuit overcurrent, when breaking down, feed back to control system fast, control in real time and monitor for control system.
4. a kind of little electrical network three-phase grid-connected inverting system according to claim 1, it is characterized in that: AC voltage transformer is installed in grid side, AC current transformer is installed in the outlet of distributed power source, be divided into three groups, gather A phase, B phase, C phase voltage and electric current respectively, voltage transformer summation current transformer secondary side inserts the interchange collection terminal of data acquisition modular converter, the direct current Hall element is connected on distributed power source outlet side and inverter direct-flow side respectively, sends detecting the signal that comes up into the direct current collection terminal of data acquisition modular converter then.
5. according to claim 1,2, the control method of 3 or 4 described a kind of little electrical network three-phase grid-connected inverting systems, it is characterized in that comprising: control of three-phase software phase-lock loop and the control of improvement hysteresis current, at first by coordinate transform with three phase static coordinate system (a, b, c) convert two-phase rest frame (α to, β) rotate to (d that rotates synchronously with the electrical network fundamental frequency again, q) coordinate system, like this, after conversion, first-harmonic sinusoidal variable in the three symmetrical rest frames will change into the direct current variable in the synchronous rotating frame, become the dq model of three-phase inverter through conversion, improve the current loop control of hysteresis current control method realization by adopting then, eliminate electric current out of control, reduce the switching tube switching frequency inverter.
6. the control method of a kind of little electrical network three-phase grid-connected inverting system according to claim 5 is characterized in that the control of three-phase software phase-lock loop comprises the following steps:
(1) initialization;
(2) image data;
(3) AD conversion is changed gathering the data of coming up;
(4) judging whether and need be incorporated into the power networks, if carry out 5, is not then to carry out 6;
(5) with the three phase static coordinate system (a, b, c) convert to the two-phase rest frame (α, β);
(6) coordinate system after will changing rotates to electrical network fundamental frequency (d, q) coordinate system of rotation synchronously again;
(7) (α β) carries out the Clark conversion with the two-phase rest frame;
(8) will with the rotation synchronously of electrical network fundamental frequency (d, q) coordinate system carries out the Pack conversion;
(9) the three-phase symmetric voltage waveform is carried out earlier the Clark conversion, carry out the Pack conversion again;
(10) supposition
Amplitude is constant,
Projection at the q axle is promptly reacted
Relation with the d axle;
(11), when Ud 〉=0, strengthen synchronous signal frequency by adjusting synchronous signal frequency;
(12) when Ud≤0, reduce synchronous signal frequency;
(13) when realizing U
d=0 o'clock, carry out software locks and control mutually, and execution (15);
(14) produce U
dSoftware locks was controlled required synchronous signal frequency mutually in=0 o'clock, and execution (15);
(15) repeat (3).
7. the control method of a kind of little electrical network three-phase grid-connected inverting system according to claim 5 is characterized in that improving hysteresis current control and comprises the following steps:
(1) initialization;
(2) voltage, current acquisition;
(3) A/D conversion becomes analog signal conversion digital signal and is sent to DSP;
(4) the phase-locked electrical network phase place that obtains of software;
(5) through 3/2 phase coordinates conversion;
(6) it is given as electric current loop to contain the electrical network phase angle information;
(7) current signal after the conversion and primary current relatively draw error signal;
(8) error is sent to hysteresis comparator;
(9) upper limit of setting hysteresis comparator;
(10) two ring widthes that differ in size are set, the upper limit of the big nearly hysteresis comparator of articulating guarantees current stabilization in the ring width limited field, and little ring width H regulates automatically with the size of compensation rate, but the change width of little ring will be in the limit range of big ring; When detecting electric current and exceed given ring width, adjust little ring width, increase the switching tube frequency, make electric current in the scope of the ring width of little ring, when electric current surmounts big circumpolar limit, enter guard mode;
(11) repeat (2), continue Control current.
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