CN105071391B

CN105071391B - The control method with fault diagnosis and automatic repair function of mixing compensation system

Info

Publication number: CN105071391B
Application number: CN201510579980.XA
Authority: CN
Inventors: 张文景
Original assignee: Individual
Current assignee: ZHANG WENJING
Priority date: 2015-09-12
Filing date: 2015-09-12
Publication date: 2017-04-05
Anticipated expiration: 2035-09-12
Also published as: CN105071391A

Abstract

The present invention discloses a kind of control method of the tool fault diagnosis and automatic repair function of mixing compensation system.The present invention is with the output three-phase current of electrical network three-phase current and TSF groups between SVG and TSF groups as detection object, the voltage of each sensor acquisition, current value are dealt with by controller, the most of reactive power of DCM diagnostic control module control TSF grading compensation loads simultaneously filters specific subharmonic, when TSF breaks down, automatically diagnose and cut off failure TSF, and redistribution is come into operation on demand to make normal TSF so as to automatic repair function；It is another to obtain the control parameter of SVG according to instantaneous power theory and realize the remaining reactive power harmonic of Continuous Compensation load.The present invention make mixing compensation system TSF is normal and malfunction under reliable and stable can run, substantially increase running efficiency of system, reduction system later maintenance cost.The inventive method energy-saving and emission-reduction, environmental protection, with good economic results in society, being especially suited for application in causes the higher field of oil drilling of TSF spoilages because of bad environments.

Description

The control method with fault diagnosis and automatic repair function of mixing compensation system

Technical field

The present invention relates to a kind of high-power idle control method with harmonic wave dynamic mixing compensation system, for suppressing electrical network Harmonic wave and compensation network are idle, are especially suited for application in because of bad environments and so that higher oil drilling of TSF spoilages etc. is deposited In a large amount of harmonic waves and idle power utilization environment, belong to field of power.

Background technology

With the development of Power Electronic Technique, a large amount of power electronic equipments are applied to industry spot and civilian place. The oil exploitation rig of such as industry spot, rolling mill, electric arc furnace, electric railway and portal crane etc., and civilian field Convertible frequency air-conditioner, elevator, converter and Medical Instruments etc..Power electronic equipment due to belonging to nonlinear load, its grid-connected meeting Produce a large amount of harmonic currents and reactive power.Harmonic current injection electrical network can cause harmonic loss, resonance risk and grid-connected set The problems such as standby failure.Reactive power injection electrical network can cause electric energy loss, electrical equipment capacity to increase, load access point voltage wave The problems such as dynamic and transmission system stability is reduced.

At present the idle and harmonic compensation device of electrical network mainly have fixed capacity device (Fastness Capacitor, FC), SVC (Static Var Compensator, SVC), Active Power Filter-APF (Active Power Filter, APF) and static reacance generator (Static Var Generator, SVG) etc..SVC includes self-saturation type reactance Device (Saturated Reactor, SR), thuristor throw-in and throw-off tuning filtering device (Thyristor Switched Filter, TSF), Thyristor-controlled reactor (Thyristor Controlled Reactor, TCR) etc..In these devices, FC, SVC etc. belong to The Passively compensated device compensated using inductance and electric capacity, advantage be can it is inexpensive, it is jumbo compensation load it is idle and Harmonic wave, major defect are to be unable to Continuous Compensation load harmonic and reactive power, and its response speed is slower；APF and SVG etc. is then Belong to active power compensator.Using modern power electronic Semiconductor Converting Technology, active power compensator can in extremely rapid succession compensate load Harmonic wave and reactive power.But have a disadvantage in that, due to the limit such as process conditions and construction costs such as power electronic devices is pressure System so as to high-power idle and harmonic compensation occasion can not be used in.In recent years, in order to the high-power harmonic wave of compensation network With it is idle, progressively developed the mixing compensation system that Passively compensated device is combined with active power compensator.At present, it is main mixed Closing compensation system has following several：

(1) a kind of Distribution Static Compensator (Distribution-Level Static Reactive Compensator, DSTATCOM) cooperate with thyristor switchable capacitor (thyristor switched capacitor, TSC) The mixing reactive compensation system of operation.Wherein, to Continuous Compensation reduced-capacity load reactive power, TSC is to divide for DSTATCOM Level compensation big capacity load reactive power.The mixing reactive compensation system by the combination of TSC and DSTATCOM realize it is low into Originally, jumbo continuous reactive power back-off.But, the mixing reactive compensation system can only compensating reactive power and load can not be compensated Harmonic wave；Simultaneously because the system only detects load current, dash current when causing TSC switchings can not be eliminated and can flow into electricity Net.Prior, once wherein one TSC breaks down in numerous TSC, whole system will be collapsed out of service.

(2) one kind is by APF, thyristor-controlled reactor (Thyristor Controlled Reactor, TCR) and fixes The combined operation system of capacitor FC compositions.Wherein, APF compensation load harmonic current, FC and TCR coordinate the idle work(of compensation load Rate.But due to fixed capacity device FC not dynamic switchings, cause system to be unable to the Large Copacity that dynamic tracking compensation varies and bear Carry lagging reactive power.

(3) a kind of idle and harmonic wave mixing compensation system being made up of with multiple stage TSC separate unit SVG.Wherein, TSC classifications are mended Repay load reactive power, the remaining reactive power of SVG compensation and all load harmonics.As device only detects load current, cause Dash current during TSC switchings and it is grid-connected when specific subharmonic current can flow into electrical network and can not be compensated；Equally at certain When platform TSC breaks down, TSC can be caused correctly to coordinate with SVG, so that whole system collapse, it is impossible to compensation load nothing Work(power harmonic.

Mixing compensation system mentioned above, not with the Passively compensated device in system carry out fault diagnosis with And for function that failure condition is optimized.And under actual field environment, the oil drilling platform of such as bad environments, number The numerous Passively compensated devices of amount tend to break down, and this just significantly reduces the stability of system, and increased and be The later maintenance cost of system.Therefore, exploitation is a kind of can have fault diagnosis and the mixing compensation system of automatic repair function to incite somebody to action There are higher practicality, economic worth.

The content of the invention

It is an object of the invention to provide a kind of controlling party of the tool fault diagnosis and automatic repair function of mixing compensation system Method, realize TSF is normal and malfunction under can be to load harmonic and the Continuous Compensation of reactive power.

For achieving the above object, the technical solution used in the present invention is：The tool failure of mixing compensation system of the present invention is examined Disconnected and repair function automatically control method, the mixing compensation system include that static reacance generator (1), thuristor throw-in and throw-off are adjusted Humorous wave filter group (2) and controller (5), the static reacance generator includes three-phase voltage-type inverter and wave filter, described Thuristor throw-in and throw-off tuning filtering device group includes more than one thuristor throw-in and throw-off tuning filtering device, the static reacance generator (1) It is in parallel with each thuristor throw-in and throw-off tuning filtering device to access electrical network；It is characterized in that：The controller include harmonic detecting module, Current tracking module, Pulse width modulation module and DCM diagnostic control module；Electricity is in real time obtained in grid side using voltage sensor The three-phase voltage U of net_a、U_b、U_c, the static reacance generator (1) is obtained in real time using current sensor adjusts with thuristor throw-in and throw-off The three-phase current I of the electrical network between humorous wave filter group (2)_a、I_b、I_c, the static reacance is obtained in real time using current sensor sends out The three-phase current I of raw device output_Ga、I_Gb、I_Gc, the thuristor throw-in and throw-off tuning filtering device group is obtained in real time using current sensor The three-phase current I of output_Ta、I_Tb、I_Tc, the dc bus of the static reacance generator (1) is obtained in real time using voltage sensor Voltage U_dc；

The control method includes：

The current three-phase voltage, described of the harmonic detecting module of the controller (5) according to the electrical network obtained in grid side The current three-phase current of the electrical network between static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) and described quiet Only the current DC bus-bar voltage of reacance generator (1), is calculated the static reacance in real time using instantaneous power theory and sends out The current fundamental reactive current I of the three-phase current of the electrical network between raw device (1) and thuristor throw-in and throw-off tuning filtering device group (2)_sqWith Current harmonic current I_ah、I_bh、I_ch, the current harmonic current I_ah、I_bhAnd I_chIn include reactive power；According to thuristor throw-in and throw-off The three-phase current I of tuning filtering device group output_Ta、I_Tb、I_Tc, the IGCT is calculated in real time using instantaneous power theory throws Cut the current fundamental reactive current detected value I of tuning filtering device group (2)_Tq；

Also, the controller (5) performs following steps：

Step I：The DCM diagnostic control module is by static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) Between electrical network three-phase current current fundamental reactive current I_sqDeduct the current output of thuristor throw-in and throw-off tuning filtering device group Electric current sum I_TmAnd obtain the currently practical fundamental reactive current I for loading_q, then to currently practical fundamental reactive current I_qAsked Lead and obtain currently practical fundamental reactive current rate of change dI_q/dt；Then utilize currently practical fundamental reactive current I_q, it is currently practical Fundamental reactive current rate of change dI_qIt is the current first switch vector logic of/dt and thuristor throw-in and throw-off tuning filtering device group, current 3rd switching logic is vectorial, current 7th switching logic vector carries out mixed logic judgement and obtains thuristor throw-in and throw-off tuning filtering The current second switch vector logic of device group；

Wherein, current output current sum I of the thuristor throw-in and throw-off tuning filtering device group_TmIt is calculated by formula (1)：

I_Tm=(S₁+S₂+...+S_m)6πfcU/[(2πf)²lc-1] (1)

In formula (1), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device, and c represents single thuristor throw-in and throw-off The capacitance of tuning filtering device, U represent the phase voltage of electrical network, and f represents the fundamental frequency of electrical network；S₁, S₂... S_mRepresent respectively brilliant The current 3rd switching logic vector M of brake tube switching tuning filtering device group₃=(S₁, S₂... S_i... S_m) in each element, Three switching logics vector when initial for (0,0 ... 0)；

The current first switch vector logic is expressed as M₁=(T₁, T₂... T_i... T_m), first switch vector logic When initial be (0,0 ... 0)；T_iValue be 1 or 0, wherein, T_iValue be 1 when represent thuristor throw-in and throw-off tuning filtering I-th thuristor throw-in and throw-off tuning filtering device input in device group, T_iValue be 0 when represent thuristor throw-in and throw-off tuning filtering device group In the excision of i-th thuristor throw-in and throw-off tuning filtering device：The current second switch vector logic is expressed as M₂=(H₁, H₂, ...H_i... H_m)；The m is available for the thuristor throw-in and throw-off tuning filtering of switching in representing the thuristor throw-in and throw-off tuning filtering device group The total quantity of device；The current 7th switching logic vector representation is M₇=(F₁, F₂... F_i... F_m), F_iValue be 1 or Person 0, wherein, F_iValue i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Normally, F_iValue represent that i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group occurs when being 0 Failure；7th switching logic vector when initial for (1,1 ... 1)；

Step II：The DCM diagnostic control module judges currently practical fundamental reactive current rate of change dI_q/ dt whether meet with Following formula (2)：

|dI_q/ dt | ＜ Δs (2)

In formula (2), Δ represents positive number；

If being unsatisfactory for formula (2), keep current first switch vector logic constant；Then on the one hand return execution step I, one side execution step III；

If meeting formula (2), current second switch vector logic is assigned to into current 4th switching logic vector and is obtained The 4th switching logic vector M to after renewal₄, the 4th switching logic vector representation is M₄=(J₁, J₂... J_i... J_m), J_iRepresent the 4th switching logic vector in thuristor throw-in and throw-off tuning filtering device group in i-th thuristor throw-in and throw-off tuning filtering device Corresponding element, J_iValue i-th thuristor throw-in and throw-off tuning filtering in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Device puts into, J_iValue represent that i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group is cut when being 0 Remove, 1≤i≤m, m is available for the thuristor throw-in and throw-off tuning filtering device of switching in representing the thuristor throw-in and throw-off tuning filtering device group Total quantity；The DCM diagnostic control module by renewal after the 4th switching logic vector M₄It is respectively outputted to the thuristor throw-in and throw-off to adjust In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of humorous wave filter group, and make each thuristor throw-in and throw-off tuning filtering device Obtain corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device carries out switching according still further to the switching signal for each obtaining；Connect , the DCM diagnostic control module judges the current fundamental reactive current detected value I of the thuristor throw-in and throw-off tuning filtering device group_TqIt is No satisfaction is with following formula (3)：

I_Tq=(J₁+J₂+...+J_i+...+J_m)6πfcU/[(2πf)²lc-1] (3)

If being unsatisfactory for formula (3), direct execution step V；

If meeting formula (3), on the other hand current 4th switching logic vector assignment is given by one side execution step IV Current first switch vector logic and the first switch vector logic after being updated, then by the first switch logic after renewal Vector M₁It is respectively outputted to the power drive of each thuristor throw-in and throw-off tuning filtering device of the thuristor throw-in and throw-off tuning filtering device group In circuit, and each thuristor throw-in and throw-off tuning filtering device is made to obtain corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device is again Switching is carried out according to the switching signal for each obtaining, to compensate the part reactive power of load and filter specific subharmonic；Then Execution step VI；

Step III：The DCM diagnostic control module is by current first switch vector logic M₁It is respectively outputted to the IGCT In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of switching tuning filtering device group, and make each thuristor throw-in and throw-off tuning Wave filter obtains corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device is thrown according still further to the switching signal for each obtaining Cut, to compensate the part reactive power of load and filter specific subharmonic；Then execution step VI；

Step IV：DCM diagnostic control module starts timing, once DCM diagnostic control module judges its timing time t_dMore than advance The timing threshold value of setting, then current first switch vector logic is assigned to into current 3rd switching logic vector and after being updated The 3rd switching logic vector, recycle update after the 3rd switching logic vector thuristor throw-in and throw-off is calculated by formula (1) Output current sum I after the renewal of tuning filtering device group_Tm, it is then back to execution step I；

Step V：The DCM diagnostic control module needs to carry out fault test in identifying thuristor throw-in and throw-off tuning filtering device group Thuristor throw-in and throw-off tuning filtering device, the thuristor throw-in and throw-off tuning filtering device for carrying out fault test then will be needed to put into electrical network It is middle first diagnose which and whether there is failure then cut off, then by the 7th switching logic vector with the thuristor throw-in and throw-off that there is failure The corresponding element of tuning filtering device is changed to 0, will adjust with the thuristor throw-in and throw-off that there is no failure in the 7th switching logic vector The corresponding element of humorous wave filter is changed to 1；When all thuristor throw-in and throw-off tuning filtering devices that there is failure are in the 7th switching logic After corresponding element is changed to 0 in vector, execution step I is returned；

Step VI：The controller by the static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) it Between electrical network three-phase current current harmonic current I_ah、I_bh、I_chStatic reacance generator is deducted as instruction current correspondence to work as The three-phase current I of front output_Ga、I_Gb、I_Gc, obtain harmonic current error；The harmonic current error is successively via the current tracking Module, Pulse width modulation module obtain the pulse width modulating signal of the harmonic current error after being processed, described quiet Only the power driving circuit in the three-phase voltage-type inverter of reacance generator is adjusted according to the pulse width of the harmonic current error Signal processed is modulated to the three-phase current that static reacance generator is exported, thus Continuous Compensation load remaining reactive power with Harmonic wave.

Preferably, it is of the invention in step I, described " and then utilize currently practical fundamental reactive current I_q, it is current real Border fundamental reactive current rate of change dI_qThe current first switch vector logic of/dt and thuristor throw-in and throw-off tuning filtering device group, when Front 3rd switching logic is vectorial, current 7th switching logic vector carries out mixed logic judgement and obtain thuristor throw-in and throw-off tuning filter The method of the current second switch vector logic of ripple device group " is as follows：

The DCM diagnostic control module is according to following a)-j) represented by different operating modes and obtain the IGCT under corresponding operating mode The current second switch vector logic of switching tuning filtering device group：

Operating mode a)：If meeting the subformula (a) in equation below (5), calculated according to the subformula (b) in formula (5) To the value of k：

If the value of k meets formula (6), the value of k is substituted in formula (7), the value of x is calculated；By the current 7th Switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further by gained To new 8th switching logic vector in rear Q₄- x values updated for 1 element is changed to 0 after the 8th switch Vector logic, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (6), directly by current 7th switching logic vector M₇It is assigned to current second to open Close vector logic M₂；

Operating mode b)：If meeting equation below (8) subformula (a), it is calculated k's by the subformula (b) in formula (8) Value：

Then, directly by current 7th switching logic vector M₇It is assigned to current second switch vector logic M₂；

Operating mode c)：If meeting the subformula (a) in equation below (9), k is calculated by the subformula (b) in formula (9) Value：

If the value of k meets formula (10), the value of k is substituted into into formula (11) and the value of x in formula is calculated；Will be current 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further will Rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the 8th Switching logic vector, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (10), directly by current 7th switching logic vector M₇It is assigned to current second Switching logic vector M₂；

Operating mode d)：If meeting the subformula (a) in equation below (12), calculated by the subformula (b) in formula (12) To the value of k：

Then, by current second switch vector logic M₂Be entered as (0,0 ... 0)；

Operating mode e)：If meeting the subformula (a) in equation below (13), calculated by the subformula (b) in formula (13) To the value of k：

If the value of k meets formula (14), the value of k is substituted in formula (15) and the value of x in formula is calculated；Ought Front 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further By the rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the Eight switching logics vector, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (14), directly by current 7th switching logic vector M₇It is assigned to current second Switching logic vector M₂；

Operating mode f)：If meeting the subformula (a) in equation below (16), calculated by the subformula (b) in formula (16) To the value of k,：

Operating mode g)：If meeting the subformula (a) in equation below (17), calculated by the subformula (b) in formula (17) To the value of k：

If the value of k meets formula (18), the value of k is substituted in formula (19) and the value of x in formula is calculated；Ought Front 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further By the rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the Eight switching logics vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (18), directly by current 7th switching logic vector M₇It is assigned to current second Switching logic vector M₂；

Operating mode h)：If meeting the subformula (a) in equation below (20), the value of k is calculated by formula (29)：

Then, by current second switch vector logic M₂Be entered as (0,0 ... 0)；

Operating mode i)：If while meeting equation below (21) and formula (22), being calculated the value of x according to formula (23)；Will Current 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then enters one Walk the rear Q in resulting new the 8th switching logic vector₄After-x value is updated for 1 element is changed to 0 8th switching logic vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If only meeting formula (21) and being unsatisfactory for formula (22), directly by current 7th switching logic vector M₇Assignment To current second switch vector logic M₂；

|dI_q/ dt | ＜ Δ and M₁≠M₃ (21)

Operating mode j)：If while meeting equation below (24) and formula (25), being calculated the value of x according to formula (26)；Will Current 7th switching logic vector assignment obtains new the 8th switching logic vector to by the 8th switching logic vector, Ran Houjin One step is by the rear Q in resulting new the 8th switching logic vector₄After-x value is updated for 1 element is changed to 0 The 8th switching logic vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If only meeting formula (24) and being unsatisfactory for formula (25), directly by current 7th switching logic vector M₇Assignment To current second switch vector logic M₂；

|dI_q/dt|≥Δ (24)

During the above is various, m is available for the thuristor throw-in and throw-off of switching to tune in representing the thuristor throw-in and throw-off tuning filtering device group The total quantity of wave filter；N represents the quantity of the thuristor throw-in and throw-off tuning filtering device that current time put into, and n is 0 when initial； I_TRepresent the output current of single thuristor throw-in and throw-off tuning filtering device, I_TIt is calculated by formula (27)；Q₄Represent that the current 8th opens Close the vector element sum of vector logic, Q₄It is calculated by formula (28)：

I_T=6 π fcU/ [(2 π f)²lc-1] (27)

In formula (27), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device, and c represents that single IGCT is thrown The capacitance of tuning filtering device is cut, U represents the phase voltage of electrical network, and f represents the fundamental frequency of electrical network；

In formula (28), V_iRepresent that the 8th switching logic is brilliant with i-th in thuristor throw-in and throw-off tuning filtering device group in vectorial The corresponding element of brake tube switching tuning filtering device, 1≤i≤m, m represent that the IGCT in thuristor throw-in and throw-off tuning filtering device group is thrown Cut the total quantity of tuning filtering device.

Preferably, the concrete grammar of step V of the present invention is as follows：

The DCM diagnostic control module is by current first switch vector logic with current second switch vector logic according to formula (29) method shown in carries out computing and obtains current 5th switching logic vector M₅；5th switching logic vector representation is M₅= (U₁, U₂... U_i... U_m), 1≤i≤m, m represent the thuristor throw-in and throw-off tuning filtering in thuristor throw-in and throw-off tuning filtering device group The total quantity of device；

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (29)

Also, the DCM diagnostic control module is performed following steps：

Step i：The DCM diagnostic control module judges whether to meet in below equation (30) to (33)：If not Meet, then show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out failure survey Examination, and execution step iii；I is 1 when initial herein, and 1≤i≤m, m represent the brilliant lock in thuristor throw-in and throw-off tuning filtering device group The total quantity of pipe switching tuning filtering device；

If meeting any one in formula (30) to (33), show i-th in thuristor throw-in and throw-off tunable filter group Thuristor throw-in and throw-off tunable filter needs to carry out fault test；Then by current 6th switching logic vector M₆In with thuristor throw-in and throw-off The corresponding element K of i-th thuristor throw-in and throw-off tunable filter in tunable filter group_iIt is updated to 1 and other all elements is updated The 6th switching logic vector M after being updated for 0₆, and execution step ii；6th switching logic vector representation is M₆= (K₁, K₂... K_i... K_m), K_iRepresent in the 6th switching logic vector with i-th of thuristor throw-in and throw-off tuning filtering device group brilliant lock The corresponding element of pipe switching tuning filtering device, 1≤i≤m, m represent the thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group The total quantity of tuning filtering device；

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (30)

Q₁＜ Q₂And U_i=2 and H_i=T_i (31)

Q₁＞ Q₂And U_i=2 and H_i=T_i (32)

Q₁=Q₂ (33)

In formula (30) to (33), T_i、H_i、U_iAnd K_iRepresent that current first switch vector logic, current second open respectively Close in the current 6th switching logic vector of vector logic, current 5th switching logic vector sum with TSF groups in i-th IGCT The corresponding element of switching tuning filtering device；Q₁All elements value sum in expression first switch vector logic, Q₂Represent that second opens Close all elements value sum in vector logic, Q₁And Q₂It is calculated by formula (34) and formula (35) respectively：

Q₁=T₁+T₂+...+T_i+...+T_m (34)

Q₂=H₁+H₂+...+H_i+...+H_m (35)

Step ii：The DCM diagnostic control module is by current 6th switching logic vector M₆Export the work(of each TSF of TSF groups In rate drive circuit, and each TSF is made to obtain corresponding switching signal；Wherein, when the power driving circuit of TSF receive it is current In 6th switching logic vector, element K corresponding with the TSF_iValue when being 1, then show that the TSF receives its power driving circuit The signal for sending is input signal；When in the current 6th switching logic vector that the power driving circuit of TSF is received, with this TSF corresponding element K_iValue when being 0, then it is excision signal to show that the TSF receives the signal that its power driving circuit sends；

Then, each thuristor throw-in and throw-off tuning filtering device carries out switching according still further to the switching signal for each obtaining, then, diagnosis Control module judges current fundamental reactive current detected value I_TqWhether meet with following formula (36)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (36)

If meeting formula (36), show current 6th switching logic vector M₆In element K_iIn corresponding TSF groups I-th thuristor throw-in and throw-off tuning filtering device does not have failure；Then by current 7th switching logic vector M₇In with do not have it is faulty The corresponding element F of thuristor throw-in and throw-off tuning filtering device_i1 is set to, so as to the 7th switching logic vector after being updated；Then cut Except the thuristor throw-in and throw-off tuning filtering device of current input；Then, execution step iii；

If being unsatisfactory for formula (36), show current 6th switching logic vector M₆In element K_iIn corresponding TSF groups I-th thuristor throw-in and throw-off tuning filtering device break down；Then by current 7th switching logic vector M₇In with break down The corresponding element F of thuristor throw-in and throw-off tuning filtering device_i0 is set to, so as to the 7th switching logic vector after being updated；Then The thuristor throw-in and throw-off tuning filtering device of the current input of excision；Then, execution step iii；

Step iii：Judge whether the value of i meets formula (37)：If be unsatisfactory for, execution step iv；If it is satisfied, then will Methods of the i as shown in formula (38) is updated, and is then back to execution step i；

1≤i ＜ m (37)

I=i+1 (38)

Step iv：The current 7th switching logic vector M that DCM diagnostic control module output is now obtained₇, it is then back to perform Step I.

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (29)

Also, DCM diagnostic control module has also performed following steps：

Step 1)：DCM diagnostic control module judges whether to meet in below equation (30) to (33)：If be discontented with Foot, then show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out fault test, Only by current 6th switching logic vector M₆In element K corresponding with i-th thuristor throw-in and throw-off tunable filter in TSF groups_iUpdate Keep other elements constant for 0, so as to the 6th switching logic vector M after being updated₆；Then, execution step is 2)；Herein I is 1 when initial, and 1≤i≤m, m represent the total of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group Quantity；6th switching logic vector representation is M₆=(K₁, K₂... K_i... K_m), K_iRepresent the 6th switching logic vector in crystalline substance The corresponding element of i-th thuristor throw-in and throw-off tuning filtering device of brake tube switching tuning filtering device group, 1≤i≤m, m represent IGCT The total quantity of the thuristor throw-in and throw-off tuning filtering device in switching tuning filtering device group；

If meeting any one in formula (30) to (33), show that i-th thuristor throw-in and throw-off in TSF groups adjusts filtering Device needs to carry out fault test；Only by current 6th switching logic vector M₆In adjust filter with i-th thuristor throw-in and throw-off in TSF groups The corresponding element K of ripple device_iIt is updated to 1 and keeps other elements constant, so as to the 6th switching logic vector M after being updated₆； Then, execution step is 2)；

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (30)

Q₁＜ Q₂And U_i=2 and H_i=T_i (31)

Q₁＞ Q₂And U_i=2 and H_i=T_i (32)

Q₁=Q₂ (33)

In formula (30) to (33), T_i、H_i、U_iAnd K_iRepresent that current first switch vector logic, current second open respectively Close in the current 6th switching logic vector of vector logic, current 5th switching logic vector sum with TSF groups in i-th IGCT The corresponding element of switching tuning filtering device；Q₁All elements value sum in expression first switch vector logic, Q₂Represent that second opens Close all elements value sum in vector logic, Q₁And Q₂It is calculated by formula (33) and formula (34) respectively：

Q₁=T₁+T₂+...+T_i+...+T_m (34)

Q₂=H₁+H₂+...+H_i+...+H_m (35)

Step 2)：Judge whether the value of i meets formula (36)：If be unsatisfactory for, execution step is 3)；If it is satisfied, then by i Method as shown in formula (37) is updated, and is then back to execution step 1)；

1≤i ＜ m (36)

I=i+1 (37)

Step 3)：Judge current 6th switching logic vector M₆In element K_iIt is for 1 or for 0；Herein, i is when initial For 1；

If current 6th switching logic vector M₆In element K_iValue be 0, then directly execution step is 4)；

If current 6th switching logic vector M₆In element K_iValue be 1, then DCM diagnostic control module is by TSF groups I-th TSF is put in electrical network, remaining TSF complete resection；Then, DCM diagnostic control module judges current fundamental reactive current inspection Measured value I_TqWhether meet with following formula (35)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (35)

If meeting formula (35), by current 7th switching logic vector M₇In with the presence failure of the current input Element F corresponding to i thuristor throw-in and throw-off tuning filtering device_i1 is set to, so as to the 7th switching logic vector after being updated, Then the thuristor throw-in and throw-off tuning filtering device that there is no failure of the current input is cut off, and execution step is 4)；

If being unsatisfactory for formula (35), by current 7th switching logic vector M₇In with the presence failure of the current input Element F corresponding to i-th thuristor throw-in and throw-off tuning filtering device_iBe set to 0, so as to the 7th switching logic after being updated to Amount, then cuts off i-th thuristor throw-in and throw-off tuning filtering device of the presence failure of the current input, and then execution step is 4)；

Step 4)：Judge whether the value of i meets formula (36)：If be unsatisfactory for, execution step is 5)；If it is satisfied, then by i Method as shown in formula (37) is updated, and is then back to execution step 3)；

1≤i ＜ m (36)

I=i+1 (37)

Step 5)：The 7th switching logic vector M after the renewal that DCM diagnostic control module output is now obtained₇, it is then back to Execution step I.

Preferably, in the formula (2), the value of Δ is 0.01-1 to the present invention.It is highly preferred that the present invention is in the formula (2), in, the value of Δ is 0.1.

Preferably, timing threshold value of the present invention is 0.02～0.5s.

Compared with prior art, the invention has the beneficial effects as follows：

(1) present invention is common using the composition mixing compensation system such as SVG, more than one parameter identical TSF and controller Compensation load harmonic and reactive power.By detecting static reacance generator SVG with thuristor throw-in and throw-off tuning filtering device group (referred to as " TSF groups ") between electrical network three-phase current and the output three-phase current of TSF groups, by controller control TSF grading compensations bear Carry required most of reactive power and compensate specific subharmonic, and control SVG to enter remaining load harmonic wave and reactive power Row Continuous Compensation.Controller also has simultaneously carries out fault diagnosis and automatic repair function online in real time：When TSF groups break down When, automatic detection is out of order TSF, then by remaining normal TSF redistributions so as to coordinate to loading idle and harmonic wave with SVG Dynamic compensation is carried out, the robustness of mixing compensation system is improve, the later maintenance cost of mixing compensation system is reduced.

(2) present invention is due to have detected the electricity between static reacance generator SVG and thuristor throw-in and throw-off tuning filtering device group The output three-phase current of the three-phase current and TSF groups of net, therefore, it is possible to TSF is introduced closed loop control, eliminates the response of TSF Impact of rush of current when time and its input to harmonic wave and reactive power compensation precision.Also, the control method of the present invention Operation of the dash current that controller can be avoided produced when fault diagnosis is performed to TSF to whole mixing compensation system is produced Damaging influence.Simultaneously so that the electric current of grid side TSF is normal and malfunction under all keep sinusoidal and unit power completely Factor.

(3) TSF that the controller in mixing compensation system of the invention can be only to having been put into He will put into carries out event Barrier diagnosis, this reduces the workload of controller, improves fault diagnosis speed it is avoided that carry out fault diagnosis to all TSF. Simultaneously as mixing compensation system of the present invention does not need interruption maintenance when TSF breaks down, fault diagnosis can be carried out online And repair automatically, so drastically increasing the work efficiency of mixing compensation system, reduce due to mixing compensation system failure Caused economic loss, is particularly well-suited to this Important Economic platform for needing continuous work of oil drilling.

(4) controller of the invention preferably adopts full digital control method so that mixing compensation system is at nominal conditions And deposit in the case of a fault still with good dynamic property and stable state accuracy in TSF.

To sum up, the present invention with reference to static reacance generator SVG to the rapidity and successional advantage of reactive-load compensation and Thuristor throw-in and throw-off tuning filtering device TSF supplement Large Copacity harmonic wave and it is idle when low-cost advantage, there is provided it is a kind of have therefore Barrier diagnosis and automatically the high performance-price ratio scheme of repair function, with good economic results in society, are suitable to push away in power system It is wide to use.Application of the present invention extensively, be especially suitable for utilization in presence it is a large amount of it is idle with harmonic wave and bad environments and easily lead The oil drilling platform for causing TSF to damage.Most of oil exploitation rigs are all to adopt diesel generating set to provide for rig at present Power, can avoid added losses of the harmonic wave to generating set using the inventive method, reduce diesel consumption in a large number, substantially reduce brill Well cost.Simultaneously as the inventive method has fault diagnosis and automatic repair function, when breaking down, it is not necessary to will be mixed Close compensation system and fault diagnosis and follow-up repair can be completed from electrical network excision, can be effectively improved the quality of power supply, reduce mixed The failure of compensation system is closed, makes rig stable and reliable in work, energy-saving and emission-reduction.Moreover, mixing compensation system of the invention can In mobile bin so as to easily as oil exploitation rig is shifted together the environment of surrounding can not resulted in Any pollution and destruction, safety and environmental protection.

Description of the drawings

Fig. 1 is the structural representation of the mixing compensation system of the tool fault diagnosis and automatic repair function of the present invention；

Fig. 2 is the schematic flow sheet of control method of the present invention；

Fig. 3 is a kind of schematic flow sheet of embodiment of step V of the present invention；

Fig. 4 is the schematic flow sheet of the another embodiment of step V of the present invention.

Specific embodiment

With reference to Fig. 1 to Fig. 4, so that specific example is to the tool fault diagnosis of the mixing compensation system of the present invention and repaiies automatically The control method of multiple function is described in detail.

In the present invention, the structure of mixing compensation system is as shown in Figure 1.Mixing compensation system includes that a static reacance is sent out Give birth to device 1 (Static Var Generator, SVG), there is by more than one identical parameters (i.e. serial inductance L and capacitance C It is identical) the thuristor throw-in and throw-off that constitutes of thuristor throw-in and throw-off tuning filtering device (Thyristor Switched Filter, TSF) adjust Humorous wave filter group 2 (referred to as " TSF groups ") and controller 5.Static reacance generator SVG and thuristor throw-in and throw-off tuning filtering device group 2 In each thuristor throw-in and throw-off tuning filtering device TSF in parallel access electrical network.

In the present invention, static reacance generator SVG includes three-phase voltage-type inverter and wave filter.As the one of the present invention Embodiment is planted, the wave filter in SVG can reduce volume using single inductance filter or using LCL filter；In SVG Three-phase voltage-type inverter can by insulated gate gate transistors (Insulated Gate Bipolar Translator, ) or integrated gate commutated thyristor (Integrated Gate Commutated Thyristors, IGCT) is built, phase IGBT The drive circuit of Ying Di, IGBT or IGCT is the power drive in the three-phase voltage-type inverter of static reacance generator SVG Circuit 3；The three-phase output end of the three-phase voltage-type inverter in SVG is connected respectively to one end of three different wave filter, should The other end of three wave filter is then connected respectively in the three-phase line of electrical network.(referring to Fig. 1)

Fig. 1 shows a kind of primary structure of TSF common at present.As shown in figure 1, TSF per by two it is reverse simultaneously The IGCT of connection constitutes a thyristor controlled series compensation, as each TSF has three-phase, therefore, each TSF has three thyristor valves Group.Thyristor controlled series compensations of the TSF per phase is connected an inductance L, therefore different from the three respectively electricity of three thyristor controlled series compensations of TSF Sense series connection, the other end of three inductance respectively (i.e. should " triangle with three junction points of the electric capacity in " triangle is connected " Three summits of shape ") connection.The electric capacity of " the triangle connection " is made up of the electric capacity that three head and the tail are sequentially connected (such as Fig. 1 institutes Show).The drive circuit of the thyristor controlled series compensation in TSF is the power driving circuit 4 of TSF.

In the present invention, controller 5 includes harmonic detecting module, current tracking module, Pulse width modulation module (Pulse-Width Modulation, PWM) and DCM diagnostic control module.Wherein, current tracking module can be using existing at present PID controller, PR controllers, repetitive controller etc..Electric current (i.e. static reacance generator 1 and the thuristor throw-in and throw-off of test point Power network current between tuning filtering device group 2) harmonic current error Jing current tracking resume module with the output current of SVG Afterwards, static reacance generator SVG is capable of the harmonic wave and reactive power of tracing compensation test point well.Pulse width modulation module Conventional SPWM (sinusoidal pulse width modulation), SVPWM (space vector pulse width modulation) etc. can be used.Controller 5 is preferably using numeral Signal processor (digital signal processor, DSP) to realize all-digitized demodulator, so as to ensure the dynamic of controller Performance and stable state accuracy.Controller 5 obtains the power network signal detected by various sensors, and thuristor throw-in and throw-off is obtained after being computed The pulse width modulation trigger of the switching signal and static reacance generator SVG of tuning filtering device group, to realize big work( Rate is idle and the dynamic mixed compensation of harmonic wave.Additionally, controller 5 also has and carrying out fault diagnosis in real time and repairing automatically work(online Energy：When having TSF to break down in TSF groups, controller 5 can automatic detection be out of order TSF, then by remaining normal TSF weights It is new to allocate so as to coordinate dynamic compensation to load idle and harmonic wave with SVG, realize automatic repair function.

Specifically, in the present invention, mixing compensation system in real time obtains electrical network in grid side using voltage sensor Three-phase voltage U_a、U_b、U_c, static reacance generator 1 (SVG) is obtained in real time with thuristor throw-in and throw-off tuning filter using current sensor The three-phase current I of the electrical network between ripple device group 2_a、I_b、I_c, the thuristor throw-in and throw-off tuning filter is obtained in real time using current sensor Total three-phase current I of ripple device group output_Ta、I_Tb、I_Tc, static reacance generator 1 (SVG) is obtained in real time using current sensor The three-phase current I of output_Ga、I_Gb、I_Gc, the dc bus of static reacance generator 1 (SVG) is obtained in real time using voltage sensor Voltage U_dc。

In the present invention, the method (referring to Fig. 2 to Fig. 4) specific as follows mixing compensation system being controlled：

Current three-phase voltage (U of the harmonic detecting module of controller 5 according to the electrical network obtained in grid side_a、U_b、U_c), it is quiet The only current three-phase current of the electrical network between reacance generator 1 (SVG) and thuristor throw-in and throw-off tuning filtering device group 2 (TSF groups) (I_a、I_b、I_c) and the static reacance generator 1 current DC bus-bar voltage U_dc, calculated using instantaneous power theory in real time To the current fundamental wave reactive power of the three-phase current of the electrical network between static reacance generator 1 and thuristor throw-in and throw-off tuning filtering device group 2 Electric current I_sqWith current harmonic current (I_ah、I_bh、I_ch), wherein, current harmonic current I_ah、I_bhAnd I_chIn include reactive power；This Outward, according to the three-phase current I of thuristor throw-in and throw-off tuning filtering device group output_Ta、I_Tb、I_Tc, calculated using instantaneous power theory in real time Obtain the current fundamental reactive current detected value I of thuristor throw-in and throw-off tuning filtering device group 2_Tq。

Also, controller 5 is performed following steps：

Step I：The DCM diagnostic control module of controller 5 is by static reacance generator 1 and thuristor throw-in and throw-off tuning filtering device group 2 Between electrical network three-phase current current fundamental reactive current I_sqDeduct the current output of thuristor throw-in and throw-off tuning filtering device group Electric current sum I_Tm, thus obtain the currently practical fundamental reactive current I for loading_q；Again to currently practical fundamental reactive current I_qEnter Row derivation and obtain currently practical fundamental reactive current rate of change dI_q/dt.Wherein, thuristor throw-in and throw-off tuning filtering device group work as Front output current sum I_TmBy being calculated with following formula (1)：

I_Tm=(S₁+S₂+...+S_i+...+S_m)6πfcU/[(2πf)²lc-1] (1)

In formula (1), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device TSF, and c represents single IGCT The capacitance of switching tuning filtering device TSF, U represent electrical network phase voltage (for example, by Chinese Industrial Standards (CIS) be 220V, by Unite States Standard It is then 110V)；F represent electrical network fundamental frequency (for example, by Chinese Industrial Standards (CIS) be 50Hz, by Unite States Standard then be 60Hz)；S₁, S₂... S_i... S_mThe current 3rd switching logic vector M of thuristor throw-in and throw-off tuning filtering device group is represented respectively₃=(S₁, S₂... S_i... S_m) in each element, the 3rd switching logic vector when initial for (0,0 ... 0), wherein, subscript m is represented The total quantity of the thuristor throw-in and throw-off tuning filtering device TSF in the thuristor throw-in and throw-off tuning filtering device group of mixing compensation system, 1≤i ≤m。

From formula (1), current output current sum I of thuristor throw-in and throw-off tuning filtering device group_TmIt is using the current 3rd The theoretical value of the thuristor throw-in and throw-off tuning filtering device group output current that the value of the element in switching logic vector is calculated.And it is brilliant The current fundamental reactive current detected value I of brake tube switching tuning filtering device group 2_TqIt is then to obtain using current sensor is actually detected Thuristor throw-in and throw-off tuning filtering device group output three-phase current I_Ta、I_Tb、I_TcAnd calculated actually detected value.

In the present invention, due to the currently practical fundamental reactive current I for loading_qIt is by the current base of the three-phase current of electrical network Ripple reactive current I_sqDeduct theoretical value I of thuristor throw-in and throw-off tuning filtering device group output current_TmAnd obtain, therefore, mixed compensation The SVG of system also can normal work when TSF breaks down so that controller constantly switching test in failure diagnostic process TSF loads idle and harmonic wave all without impact SVG normal compensatories.

Then, the DCM diagnostic control module of controller 5 utilizes currently practical fundamental reactive current I_q, currently practical fundamental wave reactive power Current changing rate dI_qThe current first switch vector logic of/dt and thuristor throw-in and throw-off tuning filtering device group, current 3rd switch Vector logic, current 7th switching logic vector carry out mixed logic judgement and obtain working as thuristor throw-in and throw-off tuning filtering device group Front second switch vector logic.

Wherein, first switch vector logic is expressed as M₁=(T₁, T₂... T_i... T_m), first switch vector logic M₁In Each element correspond to a thuristor throw-in and throw-off tuning filtering device TSF in thuristor throw-in and throw-off tuning filtering device group respectively.T_i's Value is 1 or 0, wherein, T_iValue i-th thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Tuning filtering device puts into, T_iValue i-th thuristor throw-in and throw-off tuning in thuristor throw-in and throw-off tuning filtering device group is represented when being 0 Wave filter cuts off.First switch vector logic when initial for (0,0 ... 0).3rd switching logic vector representation is M₃=(S₁, S₂... S_i... S_m), S_iRepresent element corresponding with i-th TSF in TSF groups in the 3rd switching logic vector, the 3rd switch Vector logic when initial for (0,0 ... 0).7th switching logic vector representation is M₇=(F₁, F₂... F_i... F_m), F_i's Value is 1 or 0, wherein, F_iValue i-th thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Tuning filtering device is normal, F_iValue i-th thuristor throw-in and throw-off tuning in thuristor throw-in and throw-off tuning filtering device group is represented when being 0 Faulty filter；7th switching logic vector when initial for (1,1 ... 1).Current second switch vector logic is represented For M₂=(H₁, H₂... H_i... H_m), H_iRepresent unit corresponding with i-th TSF in TSF groups in second switch vector logic Element.Subscript m represents the total quantity of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group, 1≤i≤m.

When carrying out mixed logic and judging, DCM diagnostic control module is according to following operating mode a)-j) represented by actual field Different work condition states【Operating mode a)-j) represent all operating modes of actual field】, accordingly obtain the IGCT throwing under correspondence operating mode Cut the current second switch vector logic M of tuning filtering device group₂.Concrete grammar is as follows：

Operating mode a)：If meeting the subformula (a) in equation below (2), calculated according to the subformula (b) in formula (2) To the value of k：

If the value of k meets formula (3), the value of k is substituted into into formula (4), the value of the x being calculated in formula (4)；Ought Front 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further By the rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the Eight switching logics vector, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂.Wherein, Q₄Represent all vector element sums of the 8th switching logic vector, Q₄It is calculated by formula (25).8th switching logic vector It is expressed as M₈=(V₁, V₂... V_i... V_m), V_iRepresent that the 8th switching logic is corresponding with i-th TSF in TSF groups in vectorial Element, 1≤i≤m.

It should be noted that in the present invention, by a switching logic vector assignment to another switching logic vector it is Refer to the assignment between two elements corresponding with same TSF in the two switching logics vector.For example, by the 7th switching logic Vector assignment is referred to the 8th switching logic vector：By the 1st element F in the 7th switching logic vector₁Value be assigned to the 8th The 1st element V in switching logic vector₁, by the 2nd element F in the 7th switching logic vector₂Value be assigned to the 8th switch The 2nd element V in vector logic₂, by the 3rd element F in the 7th switching logic vector₃Value be assigned to the 8th switching logic The 3rd element V in vector₃... ... by m-th element F in the 7th switching logic vector_mValue be assigned to the 8th switching logic M-th element V in vector_m。

For " the rear Q in the 8th switching logic vector is better described₄- x values are that 1 element is changed to 0 " implication, with Under be illustrated.Assume the 8th switching logic vector have the value of 5 elements and each element for (1,0,1,0,1), such as Fruit Q₄- x is equal to 2, then rear 2 values in the 8th switching logic vector are changed to 0 for 1 element, then the renewal for obtaining Afterwards the 8th switching logic vector for (1,0,0,0,0).

If the value of k is unsatisfactory for formula (3), directly by current 7th switching logic vector M₇It is assigned to current second to open Close vector logic M₂。

Operating mode b)：If meeting the subformula (a) of equation below (5), it is calculated k's by the subformula (b) in formula (5) Value：

As the value of now calculated k meets k+1 ＞ m-n, therefore, then directly by current 7th switching logic to Amount M₇It is assigned to current second switch vector logic M₂。

Operating mode c)：If meeting the subformula (a) in equation below (6), k is calculated by the subformula (b) in formula (6) Value：

If the value of k meets formula (7), the value of k is substituted into into formula (8) and the value of x in formula (8) is calculated；Ought Front 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further By the rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the Eight switching logics vector, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂。

If the value of k is unsatisfactory for formula (7), directly by current 7th switching logic vector M₇It is assigned to current second to open Close vector logic M₂。

Operating mode d)：If meeting the subformula (a) in equation below (9), k is calculated by the subformula (b) in formula (9) Value：

As the value for being now calculated k meets k+1 ＞ n, therefore, then by current second switch vector logic M₂Assignment For (0,0 ... 0).

Operating mode e)：If meeting the subformula (a) in equation below (10), calculated by the subformula (b) in formula (10) To the value of k：

If the value of k meets formula (11), by the x's being calculated in formula (12) in value substitution formula (12) of k Value；Current 7th switching logic vector assignment is obtained into new the 8th switching logic vector to the 8th switching logic vector, so Afterwards further by the rear Q in resulting new the 8th switching logic vector₄- x value is obtained more for 1 element is changed to 0 The 8th switching logic vector after new, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂。

If the value of k is unsatisfactory for formula (11), directly by current 7th switching logic vector M₇It is assigned to current second Switching logic vector M₂。

Operating mode f)：If meeting the subformula (a) in equation below (13), calculated by the subformula (b) in formula (13) To the value of k：

As the value for being now calculated k meets k ＞ m-n, therefore, then directly by current 7th switching logic vector M₇ It is assigned to current second switch vector logic M₂。

Operating mode g)：If meeting the subformula (a) in equation below (14), calculated by the subformula (b) in formula (14) To the value of k：

If the value of k meets formula (15), by the x's being calculated in formula (16) in value substitution formula (16) of k Value；Current 7th switching logic vector assignment is obtained into new the 8th switching logic vector to the 8th switching logic vector, so Afterwards further by the rear Q in resulting new the 8th switching logic vector₄- x value is obtained more for 1 element is changed to 0 The 8th switching logic vector after new, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂。

If the value of k is unsatisfactory for formula (15), directly by current 7th switching logic vector M₇It is assigned to current second Switching logic vector M₂。

Operating mode h)：If meeting the subformula (a) in equation below (17), calculated by the subformula (b) in formula (17) To the value of k：

As the value for being now calculated k meets k ＞ n, therefore, then by current second switch vector logic M₂It is entered as (0,0 ... 0).

Operating mode i)：If while meeting equation below (18) and formula (19), being calculated the value of x according to formula (20)；Will Current 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then enters one Walk the rear Q in resulting new the 8th switching logic vector₄After-x value is updated for 1 element is changed to 0 8th switching logic vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂。

|dI_q/ dt | ＜ Δ and M₁≠M₃ (18)

If only meeting formula (18) and being unsatisfactory for formula (19), directly by current 7th switching logic vector M₇Assignment To current second switch vector logic M₂。

Operating mode j)：If while meeting equation below (21) and formula (22), being calculated the value of x according to formula (23)；Will Current 7th switching logic vector assignment obtains new the 8th switching logic vector to by the 8th switching logic vector, Ran Houjin One step is by the rear Q in resulting new the 8th switching logic vector₄After-x value is updated for 1 element is changed to 0 The 8th switching logic vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂。

|dI_q/dt|≥Δ (21)

If only meeting formula (21) and being unsatisfactory for formula (22), directly by current 7th switching logic vector M₇Assignment To current second switch vector logic M₂。

More than it is various in, m represents the sum of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group Amount；N represents the quantity of the thuristor throw-in and throw-off tuning filtering device that current time put into；I_TRepresent single thuristor throw-in and throw-off tuning filter The output current of ripple device, I_TIt is calculated by formula (24)：

I_T=6 π fcU/ [(2 π f)²lc-1] (24)

In formula (24), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device, and c represents that single IGCT is thrown The capacitance of tuning filtering device is cut, U represents the phase voltage of electrical network, and f represents the fundamental frequency of electrical network.

Step II：After current second switch vector logic is calculated by step I, DCM diagnostic control module judges current Actual fundamental reactive current rate of change dI_qWhether/dt is met with following formula (26)：

|dI_q/ dt | ＜ Δs (26)

In formula (26), Δ represents positive number.The value size of Δ with will not erroneous judgement current fluctuation and thuristor throw-in and throw-off tuning Each TSF in wave filter group can quick response load change turn to principle.Will not be in the case of erroneous judgement current fluctuation, to make Each thuristor throw-in and throw-off tuning filtering device TSF quick responses load change, the value of Δ are the smaller the better.Generally, when the value of Δ is The change that load can well when 0.01～1 thuristor throw-in and throw-off tuning filtering device TSF quick responses.Preferably, Δ Value is 0.1.

(I) if currently practical fundamental reactive current rate of change dI_q/ dt is unsatisfactory for formula (26), then show load change also In transient process, therefore keep current first switch vector logic constant；Then execution step I is on the one hand returned, on the one hand Execution step III.

(II) if currently practical fundamental reactive current rate of change dI_q/ dt meets formula (26), then show that load change is entered Enter steady-state process, thus current second switch vector logic is assigned to into current 4th switching logic vector and after being updated 4th switching logic vector M₄.4th switching logic vector representation is M₄=(J₁, J₂... J_i... J_m), J_iRepresent the 4th switch Element corresponding with i-th TSF in TSF groups in vector logic, 1≤i≤m, during m represents thuristor throw-in and throw-off tuning filtering device group Thuristor throw-in and throw-off tuning filtering device total quantity.Then, the 4th switching logic vector M after DCM diagnostic control module is by renewal₄ In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device for being respectively outputted to thuristor throw-in and throw-off tuning filtering device group, and make Each thuristor throw-in and throw-off tuning filtering device obtains corresponding switching signal：J_iValue be 1 when represent thuristor throw-in and throw-off tuning filtering I-th thuristor throw-in and throw-off tuning filtering device input in device group, J_iValue be 0 when represent thuristor throw-in and throw-off tuning filtering device group In the excision of i-th thuristor throw-in and throw-off tuning filtering device.Each thuristor throw-in and throw-off tuning filtering device is according still further to the switching for each obtaining Signal carries out switching.Then, DCM diagnostic control module judges the current fundamental reactive current inspection of thuristor throw-in and throw-off tuning filtering device group Measured value I_TqWhether meet with following formula (27)：

I_Tq=(J₁+J₂+...+J_i+...+J_m)6πfcU/[(2πf)²lc-1] (27)

Now, if being unsatisfactory for formula (27), show TSF groups with the presence of TSF failures.Now direct execution step V is with right TSF groups carry out fault diagnosis.

If meeting formula (27), show that the TSF in TSF groups is normal.Now, one side execution step IV, the opposing party Current 4th switching logic vector assignment is given current first switch vector logic and the first switch logic after being updated by face Vector, then by the first switch vector logic M after renewal₁Export in the power driving circuit of each TSF of TSF groups, and make Each TSF obtains corresponding switching signal：T_iValue i-th brilliant lock in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Pipe switching tuning filtering device puts into, T_iValue represent that i-th IGCT in thuristor throw-in and throw-off tuning filtering device group is thrown when being 0 Cut the excision of tuning filtering device；Each TSF carries out switching according still further to the switching signal for each obtaining, with the idle work(in the part for compensating load Rate simultaneously filters specific subharmonic.Then, execution step VI is compensating the remaining reactive power harmonic of load.

Step III：When DCM diagnostic control module judges currently practical fundamental reactive current rate of change dI_q/ dt is unsatisfactory for | dI_q/ Dt | during ＜ Δs, then show load change in transient process.Step III is DCM diagnostic control module for load change Transient process and process that TSF groups are controlled.It is described in detail with specific example below.

First, DCM diagnostic control module is by current first switch vector logic M₁Export the power drive of each TSF of TSF groups In circuit, and each TSF is made to obtain corresponding switching signal.Specifically, the power driving circuit of each TSF is received according to which Current first switch vector logic M₁In corresponding element T_iValue be 1 or 0, to the element T_iCorresponding TSF sends phase The switching information answered：As the current first switch vector logic M that the power driving circuit of TSF is received₁In, it is corresponding with the TSF Element T_iValue when being 1, then it is input signal to show that the TSF receives the signal that its power driving circuit sends；When the power of TSF The current first switch vector logic M that drive circuit is received₁In, with the TSF corresponding element T_iValue when being 0, then show this It is excision signal that TSF receives the signal that its power driving circuit sends.Then, each thuristor throw-in and throw-off tuning filtering device is according still further to each Switching is carried out from the switching signal for obtaining, to compensate the part reactive power of load and filter specific subharmonic.Then, perform step Rapid VI is compensating the remaining reactive power harmonic of load.

As it was previously stated, current first switch vector logic M₁In each element respectively with thuristor throw-in and throw-off tuning filtering device group In one be available for switching TSF correspondence.Current first switch vector logic M₁In certain element T_iValue be 1, then it represents that The switching signal obtained by TSF corresponding with the element is：The TSF is instructed to put in electrical network；Current first switch logic to Amount M₁In certain element T_iValue be 0, then it represents that the switching signal obtained by TSF corresponding with the element is：Instruction should TSF is cut off from electrical network.Thus, the power driving circuit 4 of TSF of switching is respectively available for according to current first switch vector logic M₁ In element corresponding with each TSF value obtaining switching signal, and be respectively available for switching in making thuristor throw-in and throw-off tuning filtering device group TSF carry out switching according to the respective switching signal for obtaining, so as to realize part reactive power and the filter of grading compensation load Except specific subharmonic.

Step IV：DCM diagnostic control module starts timing, once DCM diagnostic control module judges its timing time t_dMore than advance The timing threshold value of setting, then current first switch vector logic is assigned to into current 3rd switching logic vector and after being updated The 3rd switching logic vector, recycle update after the 3rd switching logic vector thuristor throw-in and throw-off is calculated by formula (1) Output current sum I after the renewal of tuning filtering device group_Tm, it is then back to execution step I.

Have nothing in common with each other in view of the situation of actual loading, the timing threshold value of DCM diagnostic control module is preferably set by the present invention in advance It is scheduled on 0.02～0.5 second.In general, current institute can be met when the arbitrary value between timing threshold value is for 0.02s to 0.5s Some loadtypes.

Step V：DCM diagnostic control module needs to carry out the crystalline substance of fault test in identifying thuristor throw-in and throw-off tuning filtering device group Brake tube switching tuning filtering device, and to needing the thuristor throw-in and throw-off tuning filtering device for carrying out fault test to carry out with the presence or absence of failure Diagnosis；Element corresponding with the thuristor throw-in and throw-off tuning filtering device that there is failure in 7th switching logic vector is changed to into 0； When all thuristor throw-in and throw-off tuning filtering devices that there is failure, in the 7th switching logic vector, corresponding element is changed to 0 Afterwards, return execution step I.It is described in detail with specific embodiment below.

Used as a kind of embodiment of the present invention, the concrete grammar of step V (can refer to Fig. 3) as follows：

DCM diagnostic control module is by current first switch vector logic with current second switch vector logic according to formula (28) institute The method shown carries out computing and obtains current 5th switching logic vector M₅.5th switching logic vector representation is M₅=(U₁, U₂... U_i... U_m), 1≤i≤m, m represent the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group Total quantity.

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (28)

Also, DCM diagnostic control module has also performed following steps：

Step i：DCM diagnostic control module judges whether to meet in below equation (29) to (32)：If be discontented with Foot, then show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out fault test, And execution step iii.It should be noted that i is 1 when initial herein, represent from thuristor throw-in and throw-off tuning filtering device group 1st thuristor throw-in and throw-off tunable filter starts to judge whether it needs to carry out fault test；Also, 1≤i≤m, m represent brilliant lock The total quantity of the thuristor throw-in and throw-off tuning filtering device in pipe switching tuning filtering device group.

If meeting any one in formula (29) to (32), show that i-th thuristor throw-in and throw-off in TSF groups adjusts filtering Device needs to carry out fault test.Then by current 6th switching logic vector M₆In adjust with i-th thuristor throw-in and throw-off in TSF groups The corresponding element K of wave filter_iBe updated to 1 and other all elements are updated to into 0 and the 6th switching logic after being updated to Amount M₆, and execution step ii.6th switching logic vector representation is M₆=(K₁, K₂... K_i... K_m), K_iRepresent the 6th switch Element corresponding with i-th thuristor throw-in and throw-off tuning filtering device of thuristor throw-in and throw-off tuning filtering device group, 1≤i in vector logic ≤ m, m represent the total quantity of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group.

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (29)

Q₁＜ Q₂And U_i=2 and H_i=T_i (30)

Q₁＞ Q₂And U_i=2 and H_i=T_i (31)

Q₁=Q₂ (32)

Wherein, the physical significance represented by formula (29) is：In the case where TSF group needs are increased input, plan is identified In the TSF for increasing input, which needs to carry out fault test, so that follow-up step ii carries out fault diagnosis.

Physical significance represented by formula (30) is：In the case where TSF group needs are increased input, identify and be currently at In the TSF of input state, which needs to carry out fault test, so that follow-up step ii carries out fault diagnosis.

Physical significance represented by formula (31) is：In the case where TSF groups need to reduce input, identify after reducing still Will be in input state TSF in which need to carry out fault test, so that follow-up step ii carries out fault diagnosis.

Physical significance represented by formula (32) is：In the case where TSF groups had not both been increased input and do not reduced input, know In not going out to be currently at the TSF of input state, which needs to carry out fault test, so that follow-up step ii carries out fault diagnosis.

In formula (29) to (32), T_i、H_i、U_iAnd K_iRepresent that current first switch vector logic, current second open respectively Close in the current 6th switching logic vector of vector logic, current 5th switching logic vector sum with TSF groups in i-th IGCT The corresponding element of switching tuning filtering device.Q₁All elements value sum in expression first switch vector logic；Q₂Represent that second opens Close all elements value sum in vector logic.Q₁And Q₂It is calculated by formula (33) and formula (34) respectively：

Q₁=T₁+T₂+...+T_i+...+T_m (33)

Q₂=H₁+H₂+...+H_i+...+H_m (34)。

Step ii：DCM diagnostic control module is by current 6th switching logic vector M₆The power for exporting each TSF of TSF groups drives In galvanic electricity road, and each TSF is made to obtain corresponding switching signal.Specifically, the power driving circuit of each TSF is received according to which Current 6th switching logic vector in corresponding element K_iValue be 1 or 0, send corresponding switching to corresponding TSF Information：In current 6th switching logic that the power driving circuit of TSF is received is vectorial, element K corresponding with the TSF_i's When value is 1, then it is input signal to show that the TSF receives the signal that its power driving circuit sends；When the power driving circuit of TSF In the current 6th switching logic vector for receiving, with the TSF corresponding element K_iValue when being 0, then show that the TSF receives its work( The signal that rate drive circuit sends is excision signal.

Then, each thuristor throw-in and throw-off tuning filtering device carries out switching according still further to the switching signal for each obtaining.Then, diagnose Control module judges current fundamental reactive current detected value I_TqWhether meet with following formula (35)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (35)

Now, if meeting formula (35), show current 6th switching logic vector M₆In element K_iCorresponding TSF I-th thuristor throw-in and throw-off tuning filtering device in group does not have failure；Then by current 7th switching logic vector M₇In with do not have The corresponding element F of thuristor throw-in and throw-off tuning filtering device of failure_i1 is set to, so as to the 7th switching logic vector after being updated； Then cut off the thuristor throw-in and throw-off tuning filtering device of current input；Then, execution step iii.

If being unsatisfactory for formula (35), show current 6th switching logic vector M₆In element K_iIn corresponding TSF groups I-th thuristor throw-in and throw-off tuning filtering device break down.Then by current 7th switching logic vector M₇In with break down The corresponding element F of thuristor throw-in and throw-off tuning filtering device_i0 is set to, so as to the 7th switching logic vector after being updated；Then The thuristor throw-in and throw-off tuning filtering device of the current input of excision；Then, execution step iii.

Step iii：Judge whether the value of i meets formula (36)：If be unsatisfactory for, execution step iv；If it is satisfied, then will Methods of the i as shown in formula (37) is updated, and is then back to execution step i；

1≤i ＜ m (36)

I=i+1 (37)

Step i be to TSF groups in one of TSF carry out judging recognizing whether which needs to carry out fault diagnosis, if Diagnosis is needed, then further diagnoses whether the TSF is implicitly present in failure in step ii.Then the value of i is judged in step iii The purpose for whether meeting formula (36) is the knowledge of the fault diagnosis demand of all TSF (common m) in judging whether to complete to TSF groups Not, and whether complete, to needing the diagnosis of all TSF for carrying out fault diagnosis, thus to make step i, step ii and step iii Constitute closed loop.After all needing the TSF for being diagnosed to complete diagnostic work, start execution step iv.

Used as another kind of embodiment of the present invention, the concrete grammar of step V can also as follows (referring to Fig. 4)：

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (28)

Also, DCM diagnostic control module has also performed following steps：

Step 1)：DCM diagnostic control module judges whether to meet in below equation (29) to (32)：If be discontented with Foot, then show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out fault test, Now, only by current 6th switching logic vector M₆In with TSF groups in i-th thuristor throw-in and throw-off tunable filter (i.e. need not Carry out the TSF of fault test) corresponding element K_iIt is updated to 0 and keeps other elements constant, so as to the 6 after being updated Switching logic vector M₆；Then, execution step is 2).It should be noted that i is 1 when initial herein, represent from thuristor throw-in and throw-off The 1st thuristor throw-in and throw-off tunable filter in tuning filtering device group starts to judge whether each TSF in TSF groups needs to carry out one by one Fault test；Also, 1≤i≤m, m represent the total of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group Quantity.6th switching logic vector representation is M₆=(K₁, K₂... K_i... K_m), K_iRepresent the 6th switching logic vector in crystalline substance The corresponding element of i-th thuristor throw-in and throw-off tuning filtering device of brake tube switching tuning filtering device group, 1≤i≤m, m represent IGCT The total quantity of the thuristor throw-in and throw-off tuning filtering device in switching tuning filtering device group.

If meeting any one in formula (29) to (32), show that i-th thuristor throw-in and throw-off in TSF groups adjusts filtering Device needs to carry out fault test.Now, only by current 6th switching logic vector M₆In throw with i-th IGCT in TSF groups Cut tunable filter (needing to carry out the TSF of fault test) corresponding element K_iIt is updated to 1 and keeps other elements constant, so as to The 6th switching logic vector M after being updated₆.Then, execution step is 2).

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (29)

Q₁＜ Q₂And U_i=2 and H_i=T_i (30)

Q₁＞ Q₂And U_i=2 and H_i=T_i (31)

Q₁=Q₂ (32)

Q₁=T₁+T₂+...+T_i+...+T_m (33)

Q₂=H₁+H₂+...+H_i+...+H_m (34)。

1≤i ＜ m (36)

I=i+1 (37)

Through above-mentioned steps 1) and step 2) cyclic process, have identified in TSF groups that institute is in need to carry out failure one by one The TSF of diagnosis；Then, then execution step 3), to TSF groups in the TSF for carrying out fault diagnosis in need carry out fault diagnosis.

Step 3)：Judge current 6th switching logic vector M₆In element K_iIt is for 1 or for 0.It should be noted that As it was previously stated, via step 1) and step 2) cyclic process identified in TSF groups the fault diagnosis that carries out in need TSF.I is 1 when initial herein, represents that the 1st TSF again from TSF groups begins stepping through all TSF, so as to need into The TSF of row fault diagnosis is diagnosed.

If current 6th switching logic vector M₆In element K_iValue be 0, then show in TSF groups with element K_iCorrespondence I-th TSF need not carry out fault diagnosis, therefore directly execution step is 4)；

If current 6th switching logic vector M₆In element K_iValue be 1, then show in TSF groups with element K_iCorrespondence I-th TSF need to carry out fault diagnosis, thus, DCM diagnostic control module puts into i-th TSF in TSF groups in electrical network, Remaining TSF complete resection.Then, DCM diagnostic control module judges current fundamental reactive current detected value I_TqWhether meet with following formula (35)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (35)

Now, if meeting formula (35), show that i-th thuristor throw-in and throw-off tuning filtering device of the current input does not have event Barrier, then by current 7th switching logic vector M₇In i-th thuristor throw-in and throw-off tuning with the presence failure of the current input Element F corresponding to wave filter_i1 is set to, so as to the 7th switching logic vector after being updated, the current input is cut off immediately The thuristor throw-in and throw-off tuning filtering device that there is no failure, and execution step is 4).

If being unsatisfactory for formula (35), show that i-th thuristor throw-in and throw-off tuning filtering device of the current input there occurs event Barrier.Then by current 7th switching logic vector M₇In i-th thuristor throw-in and throw-off tuning with the presence failure of the current input Element F corresponding to wave filter_i0 is set to, so as to the 7th switching logic vector after being updated, the current input is cut off immediately Presence failure i-th thuristor throw-in and throw-off tuning filtering device, then execution step is 4).

1≤i ＜ m (36)

I=i+1 (37)

Through above-mentioned steps 3) and step 4) cyclic process, there is the TSF of failure in being diagnosed to be TSF groups one by one, extremely This, in the 7th switching logic vector, element corresponding with the TSF that there is failure is also all set to 0.

Therefore, step V needs to carry out the brilliant lock of fault test in first identifying thuristor throw-in and throw-off tuning filtering device group Pipe switching tuning filtering device, it is further true to needing the thuristor throw-in and throw-off tuning filtering device for carrying out fault test to be diagnosed Fixed its whether there is failure, so by the 7th switching logic vector with the thuristor throw-in and throw-off tuning filtering device pair that there is failure The element answered is changed to 0, and in thus marking thuristor throw-in and throw-off tuning filtering device group, all thuristor throw-in and throw-offs that there is failure are adjusted Humorous wave filter, so that mixing compensation system is provided with on-line fault diagnosis function.Wherein, the element of the 7th switching logic vector F_iValue represent that i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group is normal when being 1, F_i's Represent when value is 0 that i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group breaks down.

Jing after step V is diagnosed to be the TSF that there is failure, execution step I is returned.In step I, obtained using step V 7th switching logic vector updates second switch vector logic.Due to unit corresponding with failure TSF in the 7th switching logic vector The value of element is 0, therefore, in the second switch vector logic after renewal, the value of element corresponding with failure TSF is also 0.Further, walk Rapid II finally gives the first switch vector logic after updating using the second switch vector logic after renewal, correspondingly, updates In first switch vector logic afterwards, the value of element corresponding with failure TSF is also 0；TSF groups further according to renewal after first open Closing vector logic carries out switching to compensate the idle harmonic of load.Now controller realizes dividing again to the TSF in TSF groups Match somebody with somebody, only allotment makes which coordinate the idle harmonic of common compensation load with SVG using normal TSF, it is to avoid using what is broken down TSF, so that mixing compensation system is provided with the automatic repair function of failure.Therefore, present invention achieves no matter TSF groups are to be in Normal operating conditions is in malfunction, and the TSF and SVG that can control in TSF groups coordinates to loading idle harmonic Compensate.

Step VI：Further, controller 5 is by between static reacance generator 1 and thuristor throw-in and throw-off tuning filtering device group 2 Electrical network three-phase current current harmonic current I_ah、I_bh、I_chStatic reacance generator is deducted as instruction current correspondence current The three-phase current I of output_Ga、I_Gb、I_Gc, obtain harmonic current error；The harmonic current error successively via current tracking module, Pulse width modulation module obtains the pulse width modulating signal of the harmonic current error after being processed, static reacance occurs Power driving circuit 3 in the three-phase voltage-type inverter of device is according to the pulse width modulating signal of the harmonic current error to quiet Only reacance generator output three-phase current be modulated, and make static reacance generator SVG output it is modulated after three-phase The remaining reactive power harmonic of electric current Continuous Compensation load.

By above-mentioned steps I to step VI, the present invention realizes the whole nothings loaded with TSF groups dynamic mixed compensation by SVG Work(power harmonic, dash current when can avoid load harmonic, load reactive power and TSF switchings completely etc. flow into electricity Net, makes the electric current of grid side all keep sinusoidal and unity power factor at any time completely.And, the present invention makes mixed compensation System is provided with on-line fault diagnosis and automatic repair function, it is achieved thereby that no matter TSF groups be in normal operating conditions also It is that, in malfunction, the present invention can carry out Continuous Compensation to load harmonic and reactive power.

It should be noted that technical scheme is made a detailed description above in association with specific example, but Should not assert that the specific embodiment of the present invention is confined to these examples accordingly.It is common for the technical field of the invention For technical staff, on the premise of the design without departing from the present invention, some deduction or replace can also be made, these are all answered It is within the scope of the present invention when being considered as.

Claims

1. the control method with fault diagnosis and automatic repair function of a kind of mixing compensation system, the mixing compensation system Including static reacance generator (1), thuristor throw-in and throw-off tuning filtering device group (2) and controller (5), the static reacance generator Including three-phase voltage-type inverter and wave filter, the thuristor throw-in and throw-off tuning filtering device group includes more than one thuristor throw-in and throw-off Tuning filtering device, the static reacance generator (1) and each thuristor throw-in and throw-off tuning filtering device access electrical network in parallel；Which is special Levying is：The controller includes harmonic detecting module, current tracking module, Pulse width modulation module and DCM diagnostic control module； The three-phase voltage U of electrical network is obtained in grid side in real time using voltage sensor_a、U_b、U_c, institute is obtained in real time using current sensor State the three-phase current I of the electrical network between static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2)_a、I_b、I_c, profit The three-phase current I of the static reacance generator output is obtained in real time with current sensor_Ga、I_Gb、I_Gc, using current sensor The three-phase current I of the thuristor throw-in and throw-off tuning filtering device group output is obtained in real time_Ta、I_Tb、I_Tc, it is real-time using voltage sensor Obtain the DC bus-bar voltage U of the static reacance generator (1)_dc；

The control method includes：

The current three-phase voltage, described static of the harmonic detecting module of the controller (5) according to the electrical network obtained in grid side The current three-phase current of the electrical network between reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) and the static nothing The current DC bus-bar voltage of work(generator (1), is calculated the static reacance generator in real time using instantaneous power theory (1) the current fundamental reactive current I of the three-phase current of the electrical network and between thuristor throw-in and throw-off tuning filtering device group (2)_sqWith it is current Harmonic current I_ah、I_bh、I_ch, the current harmonic current I_ah、I_bhAnd I_chIn include reactive power；Tune according to thuristor throw-in and throw-off The three-phase current I of wave filter group output_Ta、I_Tb、I_Tc, the thuristor throw-in and throw-off is calculated in real time using instantaneous power theory adjusts The current fundamental reactive current detected value I of humorous wave filter group (2)_Tq；

Also, the controller (5) performs following steps：

Step I：The DCM diagnostic control module is by between static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) Electrical network three-phase current current fundamental reactive current I_sqDeduct the current output current of thuristor throw-in and throw-off tuning filtering device group Sum I_TmAnd obtain the currently practical fundamental reactive current I for loading_q, then to currently practical fundamental reactive current I_qCarry out derivation to obtain To currently practical fundamental reactive current rate of change dI_q/dt；Then utilize currently practical fundamental reactive current I_q, currently practical fundamental wave Reactive current rate of change dI_qThe current first switch vector logic of/dt and thuristor throw-in and throw-off tuning filtering device group, the current 3rd Switching logic is vectorial, current 7th switching logic vector carries out mixed logic judgement and obtains thuristor throw-in and throw-off tuning filtering device group Current second switch vector logic；

I_Tm=(S₁+S₂+...+S_m)6πfcU/[(2πf)²lc-1] (1)

In formula (1), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device, and c represents single thuristor throw-in and throw-off tuning The capacitance of wave filter, U represent the phase voltage of electrical network, and f represents the fundamental frequency of electrical network；S₁, S₂... S_mBrilliant lock is represented respectively The current 3rd switching logic vector M of pipe switching tuning filtering device group₃=(S₁, S₂... S_i... S_m) in each element, 3rd switching logic vector when initial for (0,0 ... 0)；

The current first switch vector logic is expressed as M₁=(T₁, T₂... T_i... T_m), first switch vector logic When initial be (0,0 ... 0)；T_iValue be 1 or 0, wherein, T_iValue be 1 when represent thuristor throw-in and throw-off tuning filter I-th thuristor throw-in and throw-off tuning filtering device input in ripple device group, T_iValue be 0 when represent thuristor throw-in and throw-off tuning filtering device I-th thuristor throw-in and throw-off tuning filtering device excision in group；The current second switch vector logic is expressed as M₂=(H₁, H₂, ... H_i... H_m)；The m is available for the thuristor throw-in and throw-off of switching to tune in representing the thuristor throw-in and throw-off tuning filtering device group The total quantity of wave filter；The current 7th switching logic vector representation is M₇=(F₁, F₂... F_i... F_m), F_iTake It is worth for 1 or 0, wherein, F_iValue represent that i-th thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group is adjusted when being 1 Humorous wave filter is normal, F_iValue i-th thuristor throw-in and throw-off tuning filter in thuristor throw-in and throw-off tuning filtering device group is represented when being 0 Ripple device breaks down；7th switching logic vector when initial for (1,1 ... 1)；

Step II：The DCM diagnostic control module judges currently practical fundamental reactive current rate of change dI_qWhether/dt is met with following formula (2)：

|dI_q/ dt | ＜ Δs (2)

In formula (2), Δ represents positive number；

If being unsatisfactory for formula (2), keep current first switch vector logic constant；On the one hand then return execution step I, one Aspect execution step III；

If meeting formula (2), current second switch vector logic is assigned to into current 4th switching logic vector and is obtained more The 4th switching logic vector M after new₄, the 4th switching logic vector representation is M₄=(J₁, J₂... J_i... J_m), J_iRepresent the 4th switching logic vector in thuristor throw-in and throw-off tuning filtering device group in i-th thuristor throw-in and throw-off tuning filtering device Corresponding element, J_iValue i-th thuristor throw-in and throw-off tuning filtering in thuristor throw-in and throw-off tuning filtering device group is represented when being 1 Device puts into, J_iValue represent that i-th thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group is cut when being 0 Remove, 1≤i≤m, m is available for the thuristor throw-in and throw-off tuning filtering device of switching in representing the thuristor throw-in and throw-off tuning filtering device group Total quantity；The DCM diagnostic control module by renewal after the 4th switching logic vector M₄It is respectively outputted to the thuristor throw-in and throw-off to adjust In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of humorous wave filter group, and make each thuristor throw-in and throw-off tuning filtering device Obtain corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device carries out switching according still further to the switching signal for each obtaining；Connect , the DCM diagnostic control module judges the current fundamental reactive current detected value I of the thuristor throw-in and throw-off tuning filtering device group_TqIt is No satisfaction is with following formula (3)：

I_Tq=(J₁+J₂+...+J_i+...+J_m)6πfcU/[(2πf)²lc-1] (3)

If being unsatisfactory for formula (3), direct execution step V；

If meeting formula (3), one side execution step IV, on the other hand by current 4th switching logic vector assignment to current First switch vector logic and the first switch vector logic after being updated, then by the first switch vector logic after renewal M₁It is respectively outputted to the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of the thuristor throw-in and throw-off tuning filtering device group In, and make each thuristor throw-in and throw-off tuning filtering device obtain corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device according still further to The switching signal for each obtaining carries out switching, to compensate the part reactive power of load and filter specific subharmonic；Then perform Step VI；

Step III：The DCM diagnostic control module is by current first switch vector logic M₁It is respectively outputted to the thuristor throw-in and throw-off to adjust In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of humorous wave filter group, and make each thuristor throw-in and throw-off tuning filtering device Obtain corresponding switching signal；Each thuristor throw-in and throw-off tuning filtering device carries out switching according still further to the switching signal for each obtaining, with The part reactive power of compensation load simultaneously filters specific subharmonic；Then execution step VI；

Step IV：DCM diagnostic control module starts timing, once DCM diagnostic control module judges its timing time t_dMore than set in advance Timing threshold value, then current first switch vector logic is assigned to into current 3rd switching logic vector and the after being updated the 3rd Switching logic vector, recycles the vector of the 3rd switching logic after updating to be calculated thuristor throw-in and throw-off tuning filter by formula (1) Output current sum I after the renewal of ripple device group_Tm, it is then back to execution step I；

Step V：The DCM diagnostic control module needs to carry out the crystalline substance of fault test in identifying thuristor throw-in and throw-off tuning filtering device group Brake tube switching tuning filtering device, then will need the thuristor throw-in and throw-off tuning filtering device for carrying out fault test to put in electrical network first Diagnose which and whether there is failure and then cut off, then will be in the 7th switching logic vector with the thuristor throw-in and throw-off tuning that there is failure The corresponding element of wave filter is changed to 0, will filter with the thuristor throw-in and throw-off tuning that there is no failure in the 7th switching logic vector The corresponding element of ripple device is changed to 1；When all thuristor throw-in and throw-off tuning filtering devices that there is failure are in the 7th switching logic vector In after corresponding element is changed to 0, return execution step I；

Step VI：The controller is by between the static reacance generator (1) and thuristor throw-in and throw-off tuning filtering device group (2) The current harmonic current I of the three-phase current of electrical network_ah、I_bh、I_chStatic reacance generator is deducted as instruction current correspondence currently defeated The three-phase current I for going out_Ga、I_Gb、I_Gc, obtain harmonic current error；The harmonic current error is successively via the current tracking mould Block, Pulse width modulation module obtain the pulse width modulating signal of the harmonic current error after being processed, described static Pulse width modulation of the power driving circuit in the three-phase voltage-type inverter of reacance generator according to the harmonic current error Signal is modulated to the three-phase current that static reacance generator is exported, and thus the remaining reactive power of Continuous Compensation load is harmonious Ripple.

2. control method according to claim 1, is characterized in that, in step I, described " and then using current real Border fundamental reactive current I_q, currently practical fundamental reactive current rate of change dI_q/ dt and thuristor throw-in and throw-off tuning filtering device group Current first switch vector logic, current 3rd switching logic are vectorial, current 7th switching logic vector carries out mixed logic and sentences It is disconnected and obtain the current second switch vector logic of thuristor throw-in and throw-off tuning filtering device group " method it is as follows：

The DCM diagnostic control module is according to following a)-j) represented by different operating modes and obtain the thuristor throw-in and throw-off under corresponding operating mode The current second switch vector logic of tuning filtering device group：

Operating mode a)：If meeting the subformula (a) in equation below (5), it is calculated k's according to the subformula (b) in formula (5) Value：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} > 0 & (a) \\ | (k + 1 / 2) * I_{T} | < I_{q} < | (k + 1) * I_{T} | a n d k + 1 \leq m - n & (b) \end{matrix} - - - (5)

If the value of k meets formula (6), the value of k is substituted in formula (7), the value of x is calculated；By the current 7th switch Vector logic is assigned to the 8th switching logic vector and obtains new the 8th switching logic vector, then further will be resulting Rear Q in new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the 8th switching logic Vector, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n + k + 1 - - - (6)

Σ_{i = 1}^{x} F_{i} = n + k + 1 - - - (7)

If the value of k is unsatisfactory for formula (6), directly by current 7th switching logic vector M₇It is assigned to current second switch to patrol Collect vector M₂；

Operating mode b)：If meeting equation below (8) subformula (a), the value of k is calculated by the subformula (b) in formula (8)：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} > 0 & (a) \\ | (k + 1 / 2) * I_{T} | < I_{q} < | (k + 1) * I_{T} | a n d k + 1 > m - n & (b) \end{matrix} - - - (8)

Operating mode c)：If meeting the subformula (a) in equation below (9), it is calculated k's by the subformula (b) in formula (9) Value：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} < 0 & (a) \\ | (k + 1 / 2) * I_{T} | < | I_{q} | < | (k + 1) * I_{T} | a n d k + 1 \leq n & (b) \end{matrix} - - - (9)

If the value of k meets formula (10), the value of k is substituted into into formula (11) and the value of x in formula is calculated；By the current 7th Switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further by gained To new 8th switching logic vector in rear Q₄- x values updated for 1 element is changed to 0 after the 8th switch Vector logic, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n - (k + 2) - - - (10)

Σ_{i = 1}^{x} F_{i} = n - (k + 2) - - - (11)

If the value of k is unsatisfactory for formula (10), directly by current 7th switching logic vector M₇It is assigned to current second switch to patrol Collect vector M₂；

Operating mode d)：If meeting the subformula (a) in equation below (12), it is calculated k's by the subformula (b) in formula (12) Value：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} < 0 & (a) \\ | (k + 1 / 2) * I_{T} | < | I_{q} | < | (k + 1) * I_{T} | a n d k + 1 > n & (b) \end{matrix} - - - (12)

Then, by current second switch vector logic M₂Be entered as (0,0 ... 0)；

Operating mode e)：If meeting the subformula (a) in equation below (13), it is calculated k's by the subformula (b) in formula (13) Value：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} > 0 & (a) \\ | k * I_{T} | < I_{q} < | (k + 1 / 2) * I_{T} | a n d k \leq m - n & (b) \end{matrix} - - - (13)

If the value of k meets formula (14), the value of k is substituted in formula (15) and the value of x in formula is calculated；By current Seven switching logic vector assignments obtain new the 8th switching logic vector to the 8th switching logic vector, then further by institute Rear Q in new the 8th switching logic vector for obtaining₄After-x value is updated for 1 element is changed to 0 the 8th opens Close vector logic, then by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (14), directly by current 7th switching logic vector M₇It is assigned to current second switch to patrol Collect vector M₂；

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n + k - - - (14)

Σ_{i = 1}^{x} F_{i} = n + k - - - (15)

Operating mode f)：If meeting the subformula (a) in equation below (16), it is calculated k's by the subformula (b) in formula (16) Value,：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} > 0 & (a) \\ | k * I_{T} | < I_{q} < | (k + 1 / 2) * I_{T} | a n d k > m - n & (b) \end{matrix} - - - (16)

Operating mode g)：If meeting the subformula (a) in equation below (17), it is calculated k's by the subformula (b) in formula (17) Value：

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} < 0 & (a) \\ | k * I_{T} | < | I_{q} | < | (k + 1 / 2) * I_{T} | a n d k \leq n & (b) \end{matrix} - - - (17)

If the value of k meets formula (18), the value of k is substituted in formula (19) and the value of x in formula is calculated；By current Seven switching logic vector assignments obtain new the 8th switching logic vector to the 8th switching logic vector, then further by institute Rear Q in new the 8th switching logic vector for obtaining₄After-x value is updated for 1 element is changed to 0 the 8th opens Close vector logic, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If the value of k is unsatisfactory for formula (18), directly by current 7th switching logic vector M₇It is assigned to current second switch to patrol Collect vector M₂；

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n - (k + 1) - - - (18)

Σ_{i = 1}^{x} F_{i} = n - (k + 1) - - - (19)

\{\begin{matrix} | {dI}_{q} / d t | < Δ a n d M_{1} = M_{3} a n d I_{q} < 0 & (a) \\ | k * I_{T} | < | I_{q} | < | (k + 1 / 2) * I_{T} | a n d k > n & (b) \end{matrix} - - - (20)

Then, by current second switch vector logic M₂Be entered as (0,0 ... 0)；

Operating mode i)：If while meeting equation below (21) and formula (22), being calculated the value of x according to formula (23)；Will be current 7th switching logic vector assignment obtains new the 8th switching logic vector to the 8th switching logic vector, then further will Rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the 8th Switching logic vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If only meeting formula (21) and being unsatisfactory for formula (22), directly by current 7th switching logic vector M₇It is assigned to work as Front second switch vector logic M₂；

|dI_q/ dt | ＜ Δ and M₁≠M₃ (21)

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n - - - (22)

Σ_{i = 1}^{x} F_{i} = n - - - (23)

Operating mode j)：If while meeting equation below (24) and formula (25), being calculated the value of x according to formula (26)；Will be current 7th switching logic vector assignment obtains new the 8th switching logic vector to by the 8th switching logic vector, then further By the rear Q in resulting new the 8th switching logic vector₄- x values updated for 1 element is changed to 0 after the Eight switching logics vector, by renewal after the 8th switching logic vector assignment give current second switch vector logic M₂；

If only meeting formula (24) and being unsatisfactory for formula (25), directly by current 7th switching logic vector M₇It is assigned to work as Front second switch vector logic M₂；

|dI_q/dt|≥Δ (24)

Σ_{i = 1}^{m} F_{i} &GreaterEqual; n - - - (25)

Σ_{i = 1}^{x} F_{i} = n - - - (26)

During the above is various, m is available for the thuristor throw-in and throw-off tuning filtering of switching in representing the thuristor throw-in and throw-off tuning filtering device group The total quantity of device；N represents the quantity of the thuristor throw-in and throw-off tuning filtering device that current time put into, and n is 0 when initial；I_TTable Show the output current of single thuristor throw-in and throw-off tuning filtering device, I_TIt is calculated by formula (27)；Q₄Represent that current 8th switch is patrolled Collect the vector element sum of vector, Q₄It is calculated by formula (28)：

I_T=6 π fcU/ [(2 π f)²lc-1] (27)

In formula (27), l represents the serial inductance of single thuristor throw-in and throw-off tuning filtering device, and c represents that single thuristor throw-in and throw-off is adjusted The capacitance of humorous wave filter, U represent the phase voltage of electrical network, and f represents the fundamental frequency of electrical network；

Q_{4} = Σ_{i = 1}^{m} V_{i} - - - (28)

In formula (28), V_iThrow with i-th IGCT in thuristor throw-in and throw-off tuning filtering device group in representing the 8th switching logic vector The corresponding element of tuning filtering device, 1≤i≤m are cut, m represents the thuristor throw-in and throw-off tuning in thuristor throw-in and throw-off tuning filtering device group The total quantity of wave filter.

3. control method according to claim 1 and 2, is characterized in that, the concrete grammar of step V is as follows：

The DCM diagnostic control module is by current first switch vector logic with current second switch vector logic according to formula (29) institute The method shown carries out computing and obtains current 5th switching logic vector M₅；5th switching logic vector representation is M₅=(U₁, U₂, ... U_i... U_m), 1≤i≤m, m represent the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group Total quantity；

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (29)

Also, the DCM diagnostic control module is performed following steps：

Step i：The DCM diagnostic control module judges whether to meet in below equation (30) to (33)：If be discontented with Foot, then show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out fault test, And execution step iii；I is 1 when initial herein, and 1≤i≤m, m represent the IGCT in thuristor throw-in and throw-off tuning filtering device group The total quantity of switching tuning filtering device；

If meeting any one in formula (30) to (33), show i-th brilliant lock in thuristor throw-in and throw-off tunable filter group Pipe switching tunable filter needs to carry out fault test；Then by current 6th switching logic vector M₆In with thuristor throw-in and throw-off adjust filter The corresponding element K of i-th thuristor throw-in and throw-off tunable filter in ripple device group_iBe updated to 1 and other all elements are updated to into 0 and The 6th switching logic vector M after being updated₆, and execution step ii；6th switching logic vector representation is M₆=(K₁, K₂, ... K_i... K_m), K_iRepresent i-th IGCT with thuristor throw-in and throw-off tuning filtering device group in the 6th switching logic vector The corresponding element of switching tuning filtering device, 1≤i≤m, m represent that the thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group is adjusted The total quantity of humorous wave filter；

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (30)

Q₁＜ Q₂And U_i=2 and H_i=T_i (31)

Q₁＞ Q₂And U_i=2 and H_i=T_i (32)

Q₁=Q₂ (33)

In formula (30) to (33), T_i、H_i、U_iAnd K_iRepresent that current first switch vector logic, current second switch are patrolled respectively In the current 6th switching logic vector of volume vectorial, current 5th switching logic vector sum with thuristor throw-in and throw-off tuning filtering device group in The corresponding element of i-th thuristor throw-in and throw-off tuning filtering device；Q₁Represent first switch vector logic in all elements value it With Q₂All elements value sum in expression second switch vector logic, Q₁And Q₂Calculated by formula (34) and formula (35) respectively Obtain：

Q₁=T₁+T₂+...+T_i+...+T_m (34)

Q₂=H₁+H₂+...+H_i+...+H_m (35)

Step ii：The DCM diagnostic control module is by current 6th switching logic vector M₆Export thuristor throw-in and throw-off tuning filtering device In the power driving circuit of each thuristor throw-in and throw-off tuning filtering device of group, and each thuristor throw-in and throw-off tuning filtering device is made to obtain accordingly Switching signal；Wherein, when current 6th switching logic that the power driving circuit of thuristor throw-in and throw-off tuning filtering device is received In vector, element K corresponding with the thuristor throw-in and throw-off tuning filtering device_iValue when being 1, then show thuristor throw-in and throw-off tuning filter It is input signal that ripple device receives the signal that its power driving circuit sends；When the power drive electricity of thuristor throw-in and throw-off tuning filtering device In the current 6th switching logic vector that road receives, with thuristor throw-in and throw-off tuning filtering device corresponding element K_iValue when being 0, It is excision signal then to show that the thuristor throw-in and throw-off tuning filtering device receives the signal that its power driving circuit sends；

Then, each thuristor throw-in and throw-off tuning filtering device carries out switching, then, diagnosis control according still further to the switching signal for each obtaining Module judges current fundamental reactive current detected value I_TqWhether meet with following formula (36)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (36)

If meeting formula (36), show current 6th switching logic vector M₆In element K_iCorresponding thuristor throw-in and throw-off is adjusted I-th thuristor throw-in and throw-off tuning filtering device in humorous wave filter group does not have failure；Then by current 7th switching logic vector M₇ In element F corresponding with not having faulty thuristor throw-in and throw-off tuning filtering device_i1 is set to, so as to the 7th switch after being updated Vector logic；Then cut off the thuristor throw-in and throw-off tuning filtering device of current input；Then, execution step iii；

If being unsatisfactory for formula (36), show current 6th switching logic vector M₆In element K_iCorresponding thuristor throw-in and throw-off I-th thuristor throw-in and throw-off tuning filtering device in tuning filtering device group breaks down；Then by current 7th switching logic vector M₇In element F corresponding with the thuristor throw-in and throw-off tuning filtering device for breaking down_i0 is set to, so as to the 7th switch after being updated Vector logic；Then cut off the thuristor throw-in and throw-off tuning filtering device of current input；Then, execution step iii；

Step iii：Judge whether the value of i meets formula (37)：If be unsatisfactory for, execution step iv；If it is satisfied, then i is pressed Method shown in formula (38) is updated, and is then back to execution step i；

1≤i ＜ m (37)

I=i+1 (38)

Step iv：The current 7th switching logic vector M that DCM diagnostic control module output is now obtained₇, it is then back to execution step I.

4. control method according to claim 1 and 2, is characterized in that, the concrete grammar of step V is as follows：

M₅=M₁+M₂=(T₁+H₁, T₂+H₂... T_i+H_i... T_m+H_m) (29)

Also, DCM diagnostic control module has also performed following steps：

Step 1)：DCM diagnostic control module judges whether to meet in below equation (30) to (33)：If be unsatisfactory for, Show that i-th thuristor throw-in and throw-off tunable filter in thuristor throw-in and throw-off tuning filtering device group need not carry out fault test, only will Current 6th switching logic vector M₆In with thuristor throw-in and throw-off tuning filtering device group in i-th thuristor throw-in and throw-off tunable filter pair The element K for answering_iIt is updated to 0 and keeps other elements constant, so as to the 6th switching logic vector M after being updated₆；Then, hold Row step 2)；I is 1 when initial herein, 1≤i≤m, and m represents that the thuristor throw-in and throw-off in thuristor throw-in and throw-off tuning filtering device group is adjusted The total quantity of humorous wave filter；6th switching logic vector representation is M₆=(K₁, K₂... K_i... K_m), K_iRepresent that the 6th opens Element corresponding with i-th thuristor throw-in and throw-off tuning filtering device of thuristor throw-in and throw-off tuning filtering device group in the vector logic of pass, 1≤ I≤m, m represent the total quantity of the thuristor throw-in and throw-off tuning filtering device in thuristor throw-in and throw-off tuning filtering device group；

If meeting any one in formula (30) to (33), show i-th in thuristor throw-in and throw-off tuning filtering device group it is brilliant Brake tube switching tunable filter needs to carry out fault test；Only by current 6th switching logic vector M₆In with thuristor throw-in and throw-off tune The corresponding element K of i-th thuristor throw-in and throw-off tunable filter in wave filter group_iIt is updated to 1 and keeps other elements constant, so as to The 6th switching logic vector M after being updated₆；Then, execution step is 2)；

Q₁＜ Q₂And U_i=1 and H_i＞ T_i (30)

Q₁＜ Q₂And U_i=2 and H_i=T_i (31)

Q₁＞ Q₂And U_i=2 and H_i=T_i (32)

Q₁=Q₂ (33)

Q₁=T₁+T₂+...+T_i+...+T_m (34)

Q₂=H₁+H₂+...+H_i+...+H_m (35)

Step 2)：Judge whether the value of i meets formula (36)：If be unsatisfactory for, execution step is 3)；If it is satisfied, then i is pressed formula (37) method shown in is updated, and is then back to execution step 1)；

1≤i ＜ m (36)

I=i+1 (37)

Step 3)：Judge current 6th switching logic vector M₆In element K_iIt is for 1 or for 0；Herein, i is 1 when initial；

If current 6th switching logic vector M₆In element K_iValue be 1, then DCM diagnostic control module thuristor throw-in and throw-off is tuned I-th thuristor throw-in and throw-off tuning filtering device in wave filter group is put in electrical network, and remaining thuristor throw-in and throw-off tuning filtering device is complete Portion cuts off；Then, DCM diagnostic control module judges current fundamental reactive current detected value I_TqWhether meet with following formula (35)：

I_Tq=6 π fcU/ [(2 π f)²lc-1] (35)

If meeting formula (35), by current 7th switching logic vector M₇In it is brilliant with i-th of the presence failure of the current input Element F corresponding to brake tube switching tuning filtering device_i1 is set to, so as to the 7th switching logic vector after being updated, is then cut Except the thuristor throw-in and throw-off tuning filtering device that there is no failure of the current input, and execution step is 4)；

If being unsatisfactory for formula (35), by current 7th switching logic vector M₇In i-th with the presence failure of the current input Element F corresponding to thuristor throw-in and throw-off tuning filtering device_i0 is set to, so as to the 7th switching logic after being updated is vectorial, then I-th thuristor throw-in and throw-off tuning filtering device of the presence failure of the current input is cut off, then execution step is 4)；

Step 4)：Judge whether the value of i meets formula (36)：If be unsatisfactory for, execution step is 5)；If it is satisfied, then i is pressed formula (37) method shown in is updated, and is then back to execution step 3)；

1≤i ＜ m (36)

I=i+1 (37)

Step 5)：The 7th switching logic vector M after the renewal that DCM diagnostic control module output is now obtained₇, it is then back to perform step Rapid I.

5. control method according to claim 1 and 2, is characterized in that：In the formula (2), the value of Δ is 0.01-1.

6. control method according to claim 3, is characterized in that：In the formula (2), the value of Δ is 0.01-1.

7. control method according to claim 4, is characterized in that：In the formula (2), the value of Δ is 0.01-1.

8. control method according to claim 5, is characterized in that：In the formula (2), the value of Δ is 0.1.

9. the control method according to claim 6 or 7, is characterized in that：In the formula (2), the value of Δ is 0.1.

10. the control method according to claim 1,2,6,7 or 8, is characterized in that：The timing threshold value be 0.02～ 0.5s。

11. control methods according to claim 3, is characterized in that：The timing threshold value is 0.02～0.5s.

12. control methods according to claim 4, is characterized in that：The timing threshold value is 0.02～0.5s.

13. control methods according to claim 5, is characterized in that：The timing threshold value is 0.02～0.5s.

14. control methods according to claim 9, is characterized in that：The timing threshold value is 0.02～0.5s.