CN104269864B - Catalyst switching reactive-load compensation method based on response period forecasting - Google Patents

Abstract

Based on the catalyst switching reactive-load compensation method of response period forecasting, belong to power quality control technology field, the present invention solves that in prior art, catalyst response time is difficult to predict, causes the problem that cannot realize accurate zero crossing switching. The inventive method comprises the following steps: one, gather the ambient temperature of three-phase voltage signal and three-phase current signal, the zero passage detection signal of catalyst both end voltage and device work at present, as detection signal; Two, detect signal by Signal-regulated kinase to process, and the detection signal after processing is sent into control module; Three, the power factor of current system is calculated; Four, when power factor is less than or equal to, when opening threshold value, performing five; When power factor is more than or equal to, when turning off threshold value, performing six; When power factor is in time opening threshold value and turn off between threshold value, keep laststate; Five, control module and send input compensation instruction, return execution four; Six, control module and send switching instruction, be then back to execution three.

Description

Catalyst switching reactive-load compensation method based on response period forecasting

Technical field

The present invention relates to and thus realizing catalyst switching reactive power compensation technology (HVC) of operating passing zero, to maintain the stability of electrical network, belong to power quality control technology field based on a kind of precisely prediction that catalyst is responded the cycle.

Background technology

Catalyst switching reactive power compensation technology (HVC) is dependent on contactless contactor input capacitor and carrys out the technology of reactive power in dynamic compensation electrical network, low with its price, reliability is high, be easy to safeguard, electric pressure is high, not by advantages such as power electronic devices resistance to pressure are limited, apply very general in high-pressure reactive compensation field.

Traditional HVC device is random for choosing of contactless contactor moment on controlling, and depends on manually or protective relaying device action. This control mode does not obviously meet the control requirement of automatization, and due to the random break-make of contactless contactor, immediate current can be brought to shove and the series of negative effect such as overvoltage, in some instances it may even be possible to cause burning of compensation device, the stable operation of harm electrical network.

That studies focuses on by the zero crossing of fixed phase is detected, and adopts intelligent controller to automatically control catalyst open-minded at voltage over zero, turns off at current zero-crossing point, thus effectively suppressing switching to compensate the negative effect of electric capacity moment generation. Adopt catalyst as fling-cut switch yet with HVC device, and catalyst belongs to mechanical switch, its response time is changed by the change of environmental factors, it is unable to reach the accuracy of electrical switch, this adds difficulty just to the realization synchronizing switching technology, namely catalyst response time is difficult to predict, causes and cannot realize accurate zero crossing switching.

Summary of the invention

The invention aims to solve catalyst response time in prior art be difficult to predict, cause the problem that cannot realize accurate zero crossing switching, it is provided that a kind of catalyst switching reactive-load compensation method based on response period forecasting.

Catalyst switching reactive-load compensation method based on response period forecasting of the present invention, adopts the mode of catalyst switched capacitor to carry out reactive-load compensation, it is characterised in that the method comprises the following steps:

Step one, gather the three-phase voltage signal u of described catalyst place electrical network_a, u_b, u_cWith three-phase current signal i_a, i_b, i_c, the zero passage detection signal of catalyst both end voltage and device work at present ambient temperature, as detection signal;

Step 2, detection signal step one obtained by Signal-regulated kinase are processed, and are sent into by the detection signal after processing and control module;

Step 3, in the control module, according to the detection signal after processing, and adopts instantaneous reactive power theory to calculate the power factor of current system;

Step 4, judge the size of the power factor of current system, perform corresponding operating according to condition;

When power factor is less than or equal to, when opening threshold value, performing step 5;

When power factor is more than or equal to, when turning off threshold value, performing step 6;

When power factor is in time opening threshold value and turn off between threshold value, keep laststate;

Step 5, control module send input compensation instruction, make catalyst perform closing operation by drive circuit, carry out reactive-load compensation; Return and perform step 4;

Step 6, control module send switching instruction, make catalyst perform sub-switching operation by drive circuit, are then back to perform step 3.

Advantages of the present invention: the present invention proposes a kind of technology making capacitor reach operating passing zero accurately based on the catalyst switching compensating power of response period forecasting. What the present invention was maximum is characterized in that and can be put in storage in catalyst response cycle last time, the response cycle of last time is directly invoked as reference value when switching next time, the problem affecting the response cycle without worrying the friction caused owing to the catalyst working time is elongated to become big, reaches the response cycle from model-following control. Certain oilfield electric net reactive-load compensation field measurement data analysis is utilized also to demonstrate the employing response cycle from model-following control, can the action of control contactor time be engraved in its both end voltage electric current real zero-crossing point �� 1ms range of error in, thus effectively avoiding switching moment issuable voltage current impact problem. The control method of the results show present invention has reached intended accurate operating passing zero effect, it is to avoid the negative effect such as switching moment issuable surge current and overvoltage, it is possible to ensure the stable operation of HVC device.

Owing to operating the uncertainty of voltage and variation of ambient temperature, the data sample in response cycle is difficult to fully meet the demand that HVC operating passing zero controls sometimes, it is necessary to study a kind of method carrying out on-the-spot period forecasting analysis. By catalyst being responded analysis and the experiment test of cycle influences factor, obtain ambient temperature under specific operation voltage conditions and catalyst is responded the Changing Pattern analytical expression of cycle influences, provide the catalyst response periodic quantity at varying environment temperature accordingly, it is achieved that catalyst is responded the Accurate Prediction in cycle.

Adopt catalyst synchronize switched capacitor be solve reactive power compensator high voltage that current quality of power supply field exists, high power level, low cost problem provide new thinking, have significantly high using value. The present invention can need the reactive power that compensates by dynamic real-time monitoring system, it is achieved the accurate operating passing zero of catalyst switching capacitance, it is possible to ensure the power supply quality of electrical network, improves the electrical safety of load, ensure its efficiently, safe and stable operation.

Accompanying drawing explanation

Fig. 1 is HVC reactive power compensator system block diagram, and whole system is made up of Signal-regulated kinase, control module, driving a few part such as module and reactive compensation module, and wherein in figure, A, B, C are three-phase alternating current in electrical network, i_a, i_b, i_cFor electrical network three-phase current signal, u_a, u_b, u_cFor electrical network three-phase voltage signal, compensating module adopts vacuum contactor to compensate the switching device of electric capacity as switching.

Fig. 2 is present invention HVC device topology diagram when being embodied as, and adopts the value mode of 8421 to choose, its capacity respectively 30kVar, 60kVar, 120kVar, and three-phase condenser bank adopts dihedral to couple.

Fig. 3 is that catalyst synchronizes switching control block diagram.

Fig. 4 is for synchronizing switching combined floodgate scheme schematic diagram, t_SSend the moment of input compensation instruction for system, zero cross detection circuit is with A phase voltage zero crossing for benchmark, t_ABeing monitor the zero crossing moment nearest with input compensation instruction, �� t sends input compensation instruction to time A phase voltage zero crossing being detected, t_on-jFor the delay time determined according to the ambient temperature of catalyst work at present, A₀For the true fixed phase point of catalyst actual act, t_dA-j, t_dB-j, t_dC-jThe respectively minimum delay time of three-phase.

Fig. 5 is for synchronizing switching separating brake scheme schematic diagram.

Fig. 6 is catalyst response time testing circuit, and STM32ARM single-chip microcomputer is the realistic operation time of catalyst by detecting the time difference being issued to loop from control signal to produce electric current.

Fig. 7 is experiment catalyst combined floodgate oscillogram.

Fig. 8 is experiment catalyst separating brake oscillogram.

Fig. 9 is the system flow chart of HVC device, and wherein scheming a) is the main flow chart of HVC device, and figure is b) synchronize switching subroutine flow chart.

Figure 10 is that the non-zero passage of catalyst puts into oscillogram.

Figure 11 is the non-operating passing zero oscillogram of catalyst.

Figure 12 is that catalyst zero passage first puts into oscillogram.

Figure 13 is catalyst operating passing zero oscillogram first.

Figure 14 is that catalyst second time zero passage puts into oscillogram.

Figure 15 is catalyst second time operating passing zero oscillogram.

Detailed description of the invention

Detailed description of the invention one: present embodiment is described below in conjunction with Fig. 1, based on the catalyst switching reactive-load compensation method of response period forecasting described in present embodiment, the mode adopting catalyst switched capacitor carries out reactive-load compensation, it is characterised in that the method comprises the following steps:

Step one, gather the three-phase voltage signal u of described catalyst place electrical network_a, u_b, u_cWith three-phase current signal i_a, i_b, i_c, the zero passage detection signal of catalyst both end voltage and device work at present ambient temperature, as detection signal;

Step 2, detection signal step one obtained by Signal-regulated kinase are processed, and are sent into by the detection signal after processing and control module;

Step 3, in the control module, according to the detection signal after processing, and adopts instantaneous reactive power theory to calculate the power factor of current system;

Step 4, judge the size of the power factor of current system, perform corresponding operating according to condition;

When power factor is less than or equal to, when opening threshold value, performing step 5;

When power factor is more than or equal to, when turning off threshold value, performing step 6;

When power factor is in time opening threshold value and turn off between threshold value, keep laststate;

Step 5, control module send input compensation instruction, make catalyst perform closing operation by drive circuit, carry out reactive-load compensation; Return and perform step 4;

Step 6, control module send switching instruction, make catalyst perform sub-switching operation by drive circuit, are then back to perform step 3.

In step one, gather the three-phase voltage signal u of described catalyst place electrical network_a, u_b, u_cZero crossing for determining A phase voltage is prepared. Gather three-phase current signal i_a, i_b, i_cFor calculating power factor. During system work, by current sensor and voltage sensor acquisition system three-phase current signal and three-phase voltage signal, monitor the parameters such as the reactive power of electrical network, power factor in real time.The amplitude range of the signal being able to receive that due to system core control unit is 0-3.3V, the output level of current sensor and voltage sensor can not be sent directly into the inside A/D of controller, need to send into signal conditioning circuit through being amplified, lifting, by voltage transformation, the A/D that the signal become inside single-chip microcomputer within the scope of A/D incoming level can be sent within controller samples. Meanwhile, for obtaining response time during catalyst Guan Bi, catalyst both end voltage signal need to be gathered to determine catalyst closing moment accurately; For obtaining response time when catalyst is opened, the current signal flowing through capacitor need to be gathered that is flow through the current signal of catalyst to determine that catalyst is opened the moment accurately. Meanwhile, the operation voltage response time with Accurate Prediction catalyst of current ambient temperature and catalyst is detected.

Step 4 opens threshold value=[0.7,0.8]; Turn off threshold value=[0.93,0.95].

Detailed description of the invention two: embodiment one is described further by present embodiment, the process obtaining power factor in step 3 is:

Step 31, by three-phase current signal i_a, i_b, i_cBy formula

$\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]=C_{3/2}\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]$

It is transformed to the biphase orthogonal coordinates of alpha-beta and fastens transient current i_��, i_��;

In formula, C_3/2Represent 3/2 transformation matrix of coordinates;

Step 32, biphase for alpha-beta orthogonal coordinates are fastened transient current i_��, i_��By formula

$\left[\begin{array}{c}p\\ q\end{array}\right]=\sqrt{\frac{3}{2}}{E}_m\left[\begin{array}{c}{i}_p\\ i_q\end{array}\right]=\sqrt{\frac{3}{2}}{E}_m\left[\begin{array}{cc}\sin \mathrm{\ωt}& -\cos \mathrm{\ωt}\\ -\cos \mathrm{\ωt}& -\sin \mathrm{\ωt}\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]$

Obtain instantaneous active power p and instantaneous reactive power q;

In formula: E_mRepresent system voltage peak value;

Step 33, according to formula

$\mathrm{\α}=\frac{p}{\sqrt{p^2+q^2}}$

Obtain power factor ��.

Detailed description of the invention three: present embodiment is described below in conjunction with Fig. 3, Fig. 4, Fig. 6, Fig. 7 and Fig. 8, embodiment one is described further by present embodiment, control module in step 5 sends input compensation instruction, by drive circuit make catalyst perform closing operation process be:

Step 51, determine and send moment immediate A phase voltage zero crossing with input compensation instruction;

Step 52, according to formula $t_{\mathrm{on}-j}={0.0002T}_j^3-{0.0002T}_j^2-{0.0981T}_j+148.7423+{\mathrm{\Δt}}_{j-1}$ Response period forecasting value t opened by catalyst when calculating jth time input catalyst_on-j; J=1,2 ...

In formula: T_jAmbient temperature during for jth time input catalyst; �� t_j-1The difference of response period forecasting value opened by catalyst when catalyst when putting into catalyst for this opens response cycle actual value with last input catalyst; Make �� t₀=0;

Step 53, according to formula

$\left\{\begin{array}{c}{t}_{\mathrm{dA}-j}=n/2f-t_{\mathrm{on}-j}+8.33\\ t_{\mathrm{dB}-j}=n/2f-t_{\mathrm{on}-j}+5\\ t_{\mathrm{dC}-j}=n/2f-t_{\mathrm{on}-j}+1.67\end{array}\right.$

Obtain the minimum delay time t that catalyst corresponding to three-phase compensation capacitor closes a floodgate_dA-j, t_dB-j, t_dC-j;

In formula: n is the minimum delay time t that catalyst closes a floodgate_dA-j, t_dB-j, t_dC-jFor positive smallest positive integral value;

Step 54, the A phase voltage zero crossing determined with step 51 are for basic point, the minimum delay time closed a floodgate by the catalyst that the three-phase compensation capacitor of step 53 acquisition is corresponding carries out time delay, and the instruction then sent according to control module starts the closing operation of three-phase contactor.

To open response cycle actual value be after this closing operation completes to this catalyst when putting into catalyst recorded in step 52, by controlling the numerical value that module is measured, is control module to issue instructions to contactor coil and power on the time experienced. The measurement of the circuit shown in Fig. 6 is adopted to obtain.

When meeting switching condition needs to catalyst action, gather and measure current temperature signal, call historical responses temporal database, the difference of response period forecasting value opened by catalyst when catalyst when obtaining this cut-in and cut-off contactor opens response cycle actual value with last cut-in and cut-off contactor, and then calculates the action delay time needed for ensureing switch operating passing zero; The fixed phase determined with the voltage and current signal zero passage detection at switch contact two ends again, for benchmark, after carrying out the time delay of certain time, provides the switching instruction of system, it is ensured that the zero passage of catalyst turns on and off. After catalyst responds, calculate single-chip microcomputer and send switching instruction to the time that contactor coil powers on as this catalyst response cycle, it is stored in data base, reference value as catalyst response cycle next time, so circulation, moment can make optimal adjustment according to HVC field conditions, be the response cycle from model-following control.

Catalyst when calculating jth time input catalyst described in present embodiment is opened the formula of response period forecasting value and is applicable to ambient temperature between (-35 DEG C, 40 DEG C). When ambient temperature is positioned at outside (-35 DEG C, 40 DEG C), when ambient temperature is lower than-35 DEG C, response period forecasting value adopts the value of-35 DEG C, ambient temperature higher than 40 DEG C and time, response period forecasting value adopts the value of 40 DEG C.

Described response period forecasting is based on the purpose synchronizing switching, services for synchronizing switching, reaches operating passing zero the most accurately. After zero crossing being detected, by the response time of catalyst, it is determined that time delay is to reach the accurate switching of next zero passage. Zero cross detection circuit is A phase voltage zero crossing is benchmark, when at t_AAfter moment monitors the zero crossing nearest with reclosing command, it is necessary to determine delay time according to the ambient temperature of catalyst work at present, and determine the true fixed phase point A of catalyst actual act₀Owing to the time difference of fixed phase point with monitoring phase point is n/2f, therefore the switching order of three-phase compensation capacitor group is C phase-A phase-B phase, and with the phase angle difference of fixed phase point respectively 30 ��, 90 �� and 150 ��, the time delay concrete condition of input compensation is as shown in Figure 4. Closing time that Fig. 7 and Fig. 8 provides respectively and the schematic diagram of opening time.

Detailed description of the invention four: below in conjunction with Fig. 1, Fig. 2, Fig. 5, Figure 10 to Figure 15, present embodiment being described, embodiment one is described further by present embodiment,

Control module in step 6 sends switching instruction, by drive circuit make catalyst perform sub-switching operation process be:

Step 61, determine and send moment immediate A phase voltage zero crossing with switching instruction;

Step 62, according to formula

$t_{\mathrm{off}-k}={0.0001T}_k^4-{0.0003T}_k^3-0.0379T_k^2+{0.2871T}_k+21.0165+{{\mathrm{\Δt}}_{k-1}}^{\′}$

Calculate catalyst turn-off response period forecasting value t during kth time cut-in and cut-off contactor_off-k; K=1,2 ...

In formula: T_kAmbient temperature during for kth time cut-in and cut-off contactor; �� t_k-1' for this cut-in and cut-off contactor time catalyst turn-off response cycle actual value with last cut-in and cut-off contactor time the difference of catalyst turn-off response period forecasting value; Make �� t₀'=0;

Step 63, according to formula

$\left\{\begin{array}{c}{t}_{\mathrm{dA}-k}=n/2f-t_{\mathrm{on}-k}+8.33\\ t_{\mathrm{dB}-k}=n/2f-t_{\mathrm{on}-k}+5\\ t_{\mathrm{dC}-k}=n/2f-t_{\mathrm{on}-k}+1.67\end{array}\right.$

Obtain the minimum delay time t of catalyst separating brake corresponding to three-phase compensation capacitor_dA-k, t_dB-k, t_dC-k;

Step 64, the A phase voltage zero crossing determined with step 61 are for basic point, the minimum delay time of catalyst separating brake corresponding to three-phase compensation capacitor obtained by step 63 carries out time delay, then according to the sub-switching operation controlling the instruction that module sends and starting three-phase contactor.

Catalyst turn-off response cycle actual value during this cut-in and cut-off contactor recorded in step 62 is after this sub-switching operation completes, and by controlling the numerical value that module is measured, is control module to issue instructions to the time that contactor coil power-off is experienced.

The formula of catalyst turn-off response period forecasting value when calculating jth time cut-in and cut-off contactor described in present embodiment is applicable to ambient temperature between (-35 DEG C, 40 DEG C). When ambient temperature is positioned at outside (-35 DEG C, 40 DEG C), when ambient temperature is lower than-35 DEG C, response period forecasting value adopts the value of-35 DEG C, ambient temperature higher than 40 DEG C and time, response period forecasting value adopts the value of 40 DEG C.

When catalyst separating brake, response to which time t according to the ambient temperature that catalyst is current_off-kIt is predicted, it is determined that with reference to zero crossing A₀After, the separating brake order of three-phase compensation capacitor group is C phase-A phase-B phase, and with the phase angle difference of fixed phase point respectively 60 ��, 120 �� and 180 ��, the concrete condition of switching time delay is as shown in Figure 5.

Present embodiment gives a specific embodiment, by arranging HVC device shown in Fig. 2, closing and opening test is carried out by the method for the invention, then obtain the curve linear relationship of Figure 10 to Figure 15, can be shown that the stable operation safeguarding HVC device is very disadvantageous by the catalyst random switching at non-zero crossing by Figure 10-Figure 15, and adopt the synchronization switching control mode designed by the present invention, predict based on catalyst response time, reference the most next for this secondary response cycle warehouse-in is reached the response cycle from model-following control, the voltage current impact situation of catalyst switching moment generation can be prevented effectively from. by contrasting twice switching effect of catalyst, demonstrate response time from model-following control strategy, can the action of control contactor time be engraved in its both end voltage electric current real zero-crossing point �� 1ms range of error in, thus effectively avoiding the switching moment issuable shock problem that shoves.

Claims (4)

1., based on the catalyst switching reactive-load compensation method of response period forecasting, adopt the mode of catalyst switched capacitor to carry out reactive-load compensation, it is characterised in that the method comprises the following steps:

Step one, gather the three-phase voltage signal u of described catalyst place electrical network_a, u_b, u_cWith three-phase current signal i_a, i_b, i_c, the zero passage detection signal of catalyst both end voltage and device work at present ambient temperature, as detection signal;

Step 2, detection signal step one obtained by Signal-regulated kinase are processed, and are sent into by the detection signal after processing and control module;

Step 3, in the control module, according to the detection signal after processing, and adopts instantaneous reactive power theory to calculate the power factor of current system;

Step 4, judge the size of the power factor of current system, perform corresponding operating according to condition;

When power factor is less than or equal to, when opening threshold value, performing step 5;

When power factor is more than or equal to, when turning off threshold value, performing step 6;

When power factor is in time opening threshold value and turn off between threshold value, keep laststate;

Step 5, control module send input compensation instruction, make catalyst perform closing operation by drive circuit, carry out reactive-load compensation; Return and perform step 4;

Step 6, control module send switching instruction, make catalyst perform sub-switching operation by drive circuit, are then back to perform step 3,

Control module in step 5 sends input compensation instruction, by drive circuit make catalyst perform closing operation process be:

Step 51, determine and send moment immediate A phase voltage zero crossing with input compensation instruction;

Step 52, according to formula $t_{on-j}=0.0002T_j^3-0.0002T_j^2-0.0981T_j+148.7423+{\mathrm{\Δt}}_{j-1}$ Response period forecasting value t opened by catalyst when calculating jth time input catalyst_on-j; J=1,2 ...

In formula: T_jAmbient temperature during for jth time input catalyst; �� t_j-1The difference of response period forecasting value opened by catalyst when catalyst when putting into catalyst for this opens response cycle actual value with last input catalyst; Make �� t₀=0;

Step 53, according to formula

$\left\{\begin{array}{c}{t}_{dA-j}=n/2f-t_{on-j}+8.33\\ t_{dB-j}=n/2f-t_{on-j}+5\\ t_{dC-j}=n/2f-t_{on-j}+1.67\end{array}\right.$

Obtain the minimum delay time t that catalyst corresponding to three-phase compensation capacitor closes a floodgate_dA-j, t_dB-j, t_dC-j;

In formula: n is the minimum delay time t that catalyst closes a floodgate_dA-j, t_dB-j, t_dC-jFor positive smallest positive integral value;

Step 54, the A phase voltage zero crossing determined with step 51 are for basic point, the minimum delay time closed a floodgate by the catalyst that the three-phase compensation capacitor of step 53 acquisition is corresponding carries out time delay, and the instruction then sent according to control module starts the closing operation of three-phase contactor.

2. according to claim 1 based on the catalyst switching reactive-load compensation method of response period forecasting, it is characterised in that the process obtaining power factor in step 3 is:

Step 31, by three-phase current signal i_a, i_b, i_cBy formula

$\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]=C_{3/2}\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]$

It is transformed to the biphase orthogonal coordinates of alpha-beta and fastens transient current i_��, i_��;

In formula, C_3/2Represent 3/2 transformation matrix of coordinates;

Step 32, biphase for alpha-beta orthogonal coordinates are fastened transient current i_��, i_��By formula

$\left[\begin{array}{c}p\\ q\end{array}\right]=\sqrt{\frac{3}{2}}{E}_m\left[\begin{array}{c}{i}_p\\ i_q\end{array}\right]=\sqrt{\frac{3}{2}}{E}_m\left[\begin{array}{cc}sin\mathrm{\ω}t& -cos\mathrm{\ω}t\\ -cos\mathrm{\ω}t& -sin\mathrm{\ω}t\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]$

Obtain instantaneous active power p and instantaneous reactive power q;

In formula: E_mRepresent system voltage peak value;

Step 33, according to formula

$\mathrm{\α}=\frac{p}{\sqrt{p^2+q^2}}$

Obtain power factor ��.

3. according to claim 1 based on the catalyst switching reactive-load compensation method of response period forecasting, it is characterized in that, response cycle actual value opened by catalyst when this puts into catalyst is after this closing operation completes, by controlling the numerical value measured of module, it is control module to issue instructions to contactor coil and power on the time experienced.

4. according to claim 1 based on the catalyst switching reactive-load compensation method of response period forecasting, it is characterised in that open threshold value=[0.7,0.8]; Turn off threshold value=[0.93,0.95].