CN104485676B - Generating set primary frequency regulation non-linear governor-side PSS control method - Google Patents

Abstract

The invention discloses a kind of generating set primary frequency regulation non-linear governor-side PSS control method, the method controls the output instruction signal in loop and carries out non-linear speed limit calculating process generating set primary frequency regulation, then the signal after calculating being handled well controls output instruction signal as new generating set primary frequency regulation, and the control output order substituted in former generating set primary frequency regulation control loop carries out primary frequency modulation control.Owing to generating set primary frequency regulation control instruction to be carried out non-linear speed limit process, thus, this method has the features such as convenient, easy, the strong robustness of parameter tuning of enforcement.

Description

Generating set primary frequency regulation non-linear governor-side PSS control method

Technical field

The present invention relates to technical field of electric power, particularly relate to a kind of non-linear speed governing of generating set primary frequency regulation Side power system stabilizer, PSS control method.

Background technology

Low-frequency oscillation is a kind of phenomenon being unfavorable for power system security and stable operation, can have a strong impact on electric power The stability of system and the safe operation of generating set, even damage power system, cause large area Have a power failure.A kind of common scheme of suppression system low-frequency oscillation is to be acted on by power system stability device (PSS) The excitation system of generating set.But due to excitation system and power system and the method for operation thereof and the close phase of operating mode Close so that in power system, can the coordinate design of PSS and infield be chosen to PSS and be used for electric power The key of system and difficult point.At present, in the generating set being mounted with PSS, low-frequency oscillation still time There is generation.

When network system generation low-frequency oscillation, mains frequency and the power of the assembling unit also can occur to vibrate accordingly, Causing governing system and the corresponding action of primary frequency modulation, by there is the resonance of governing system and network system, entering One step deteriorates the low-frequency oscillation of network system, the safety of serious threat network system.

Governing system additional longitudinal forces is being structurally and functionally similar with PSS, also referred to as speed regulator Side power system stabilizer, PSS (GPSS), its effect is just to produce one by controlled quentity controlled variable input governor system control Damping torque suppresses the low-frequency oscillation of power system.Owing to turbine regulating system and electric network state contact relatively Weak, therefore GPSS is good to the robustness of system operation mode and operating mode, and has multimachine Decoupling Characteristics.Mesh The method of the front GPSS of realization mainly realizes suppressing low frequency by adding anticipatory control in speed feedback passage Vibration, anticipatory control parameter sets and simply requires that phase compensation is more than delayed phase, the suppression effect of low-frequency oscillation The poorest, control action too frequently causes speed adjusting system load heavier simultaneously, increases the fault of governing system Rate, causes the stability of power system and the safety of generating set to reduce.

It addition, the parameter of turbine regulating system selects the improper low-frequency oscillation that negative damping can be provided to deteriorate system. For improving the control accuracy of mains frequency, the general unit commitment primary frequency function that requires to generate electricity by way of merging two or more grid systems, electrical network Relevant departments monitor the primary frequency modulation actual act situation of each generating set in real time, to primary frequency modulation action not Qualified unit carries out examination.Owing to the factors such as the randomness fluctuated by mains frequency and uncertainty are affected, Usually there is the situation that load compensation amount is not enough and is examined by electrical network in generating set actual primary frequency modulation action.For Improve generating set primary frequency regulation load compensation amount, it is to avoid examination, side of generating set is usually taken reduction The measures such as rate, increase primary frequency modulation load instruction, although improve primary frequency modulation load compensation amount, but drop The low stability of system, exacerbates the vibration of steam turbine pitch, adds the fault rate of pitch, the most very To causing the serious accidents such as steam turbine pitch EH oil pipe break.

Summary of the invention

Poor to the inhibition of low-frequency oscillation for above-mentioned oscillation suppression method, cause the stability of power system The problem that safety with generating set is low, it is to avoid turbine regulating system provides negative damping to deteriorate system The generation of low-frequency oscillation, it is an object of the invention to provide a kind of generating set primary frequency regulation non-linear speed governing side electricity Force system stabilizer control method.To this end, the technical scheme used is as follows.

A kind of generating set primary frequency regulation non-linear governor-side PSS control method, to electromotor Group primary frequency modulation controls the output instruction signal in loop and carries out non-linear speed limit calculating process, will process gained The control output order that the former generating set primary frequency regulation of signal substituting controls in loop carries out primary frequency modulation control,

The described output instruction signal controlled generating set primary frequency regulation in loop carries out non-linear speed limit meter Calculation processes, and step is as follows:

Step 1, controls generating set primary frequency regulation the output instruction signal in loop and delivers to calculate treatment loop IN input, be D by computing by IN signal decomposition₁And D_fThe signal of two components, as follows Carry out:

D₁=(1-K_r)·IN

D_f=K_r·IN

In formula, K_rFor damping action intensive parameter constant；

Step 2, to the D obtained in step 1_fSignal carries out calculating process, is split as positive component signal D_fPWith negative value component signal D_fN, calculate and carry out as follows:

$D_{\mathrm{fP}}=f_1\left(D_f\right)=\left\{\begin{array}{cc}{D}_f& (D_f\&GreaterEqual;0)\\ 0& (D_f<0)\end{array}\right.$

$D_{\mathrm{fN}}=f_2\left(D_f\right)=\left\{\begin{array}{cc}0& (D_f\&GreaterEqual;0)\\ D_f& (D_f<0)\end{array}\right.$

Step 3, to the D obtained in step 2_fPAnd D_fNSignal carries out non-linear speed limit calculation process respectively, Obtain D₂Signal and D₃Signal,

The speed limit operation function of non-linear speed limit calculation process has 3 input signals, respectively input signals R_in、 Upper cycle operation result R_out(n-1)Arranging parameter R with rate limit, speed limit operation function has 1 output signal R_out, speed limit operation function carries out computing according to following 2 kinds of situations:

1st kind of situation:

T is execution cycle time constant, and engineering unit is s, when meetingTime, then this Computing R_outOutput is pressed formula and is calculated:

R_out=RL (R_in,R_out(n-1), R) and=R_in

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

2nd kind of situation:

WhenTime, then this computing R_outOutput is pressed formula and is calculated:

$R_{\mathrm{out}}=\mathrm{RL}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)},R)=\left\{\begin{array}{cc}{R}_{\mathrm{out}(n-1)}+R& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_{\mathrm{out}(n-1)}-R& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

Step 3.1: positive component signal D_fPNon-linear speed limit calculation process, if rise computing, Then select higher speed limit parameter value；If the computing declined, then select slower speed limit parameter value.By with Lower formula carries out speed limit parameter value R_PSelection calculate:

$R_P=f_{\mathrm{RP}}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)})=\left\{\begin{array}{cc}{R}_f& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_s& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

In formula, R_fFor higher rate constraining parameters constant, R_sFor slower rate constraining parameters constant,

Obtain R_PAfter, to D_fPCarry out RL speed limit functional operation, obtain D₂Signal, is calculated as follows:

D₂=RL (D_fP,D_2(n-1),R_P)

Obtain D₂After, its value is assigned to D_2(n-1), in order to called when next execution cycle:

D_2(n-1)=D₂

Step 3.2: negative value component signal D_fNNon-linear speed limit calculation process, if the computing risen, then Select slower speed limit parameter value；If the computing declined, then select higher speed limit parameter value.Press public affairs Formula carries out speed limit parameter value R_NSelection calculate:

$R_N=f_{\mathrm{RN}}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)})=\left\{\begin{array}{cc}{R}_s& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_f& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

Obtain R_NAfter, to D_fNCarry out RL speed limit functional operation, obtain D₃Signal, is calculated as follows:

D₃=RL (D_fN,D_3(n-1),R_N)

Obtain D₃After, its value is assigned to D_3(n-1), in order to called when next execution cycle:

D_3(n-1)=D₃

Step 4: by D calculated in step 1₁, calculated D in step 3₂And D₃Add up mutually, Obtain calculate treatment loop output signal OUT:

OUT=D₁+D₂+D₃

Calculated calculating treatment loop OUT signal is substituted former generating set primary frequency regulation control in loop Control output order carry out primary frequency modulation control.

Use the generating set primary frequency regulation non-linear governor-side PSS control method of the present invention, During mains frequency fluctuation offrating, it is possible to more efficiently increase generating set reality and once adjust When there is big load disturbance in the load compensation amount of action frequently, especially network load, the increasing of load compensation amount Add and will be apparent from；During mains frequency returns to rated value, using the teaching of the invention it is possible to provide a stronger damping is made With, prevent the generation of low frequency oscillations；During the fierce fluctuation of mains frequency offrating, at it Under the effect of damping, in addition to the load compensation amount of bigger primary frequency modulation action can be provided, moreover it is possible to effectively Avoid the occurrence of the regulation fluctuation repeatedly of steam turbine pitch, prevent steam turbine pitch from vibrating；Occur at electrical network During low frequency oscillations, under its effect damped, unit primary frequency modulation will not participate in system oscillation process Regulation, prevents governing system and resonates with network system, is conducive to suppressing the low-frequency oscillation of network system, Improve network system security and stability.

Accompanying drawing explanation

Fig. 1 is the control loop implementation figure of the present invention；

Fig. 2 is that a typical generating set primary frequency regulation controls circuit diagram；

Fig. 3 is the structural representation of the specific embodiment of the present invention.

Detailed description of the invention

The present invention can be at DCS (Distributed Control System, DCS), PLC (Programmable Logic Controller, PLC), programming realization on single-chip microcomputer or computer.For making this patent easier to understand, Below in conjunction with the accompanying drawings this patent is further elaborated, but the embodiment in accompanying drawing does not constitute and appoints this patent What limits.

As it is shown in figure 1, as follows 1～step 4 calculating process, to generating set primary frequency regulation control Output instruction signal in loop carries out non-linear speed limit calculating and processes, and step is as follows:

Step 1, controls generating set primary frequency regulation the output instruction signal in loop and delivers to calculate treatment loop IN input, be D by computing by IN signal decomposition₁And D_fThe signal of two components, as follows Carry out:

D₁=(1-K_r)·IN

D_f=K_r·IN

In formula, K_rFor damping action intensive parameter constant, this constant is adjustable parameter, its span 0～1, Representative value is 0.8.

Step 2, to the D obtained in step 1_fSignal carries out calculating process, is split as positive component signal D_fPWith negative value component signal D_fN, calculate and carry out as follows:

$D_{\mathrm{fP}}=f_1\left(D_f\right)=\left\{\begin{array}{cc}{D}_f& (D_f\&GreaterEqual;0)\\ 0& (D_f<0)\end{array}\right.$

$D_{\mathrm{fN}}=f_2\left(D_f\right)=\left\{\begin{array}{cc}0& (D_f\&GreaterEqual;0)\\ D_f& (D_f<0)\end{array}\right.$

In DCS configuration loop, it is possible to use the export-restriction block of DCS or piecewise linear interpolation functional blocks f (x) Realize positive component signal D_fPWith negative value component signal D_fNCalculating.

Such as, piecewise linear interpolation functional blocks f (x) is used to realize, then:

D_fPF (x) calculate calculated by piecewise linear interpolation by following function point:

F (x) inputs %	-100	0	100
				F (x) exports %	0	0	100

D_fNF (x) calculate calculated by piecewise linear interpolation by following function point:

F (x) inputs %	-100	0	100
				F (x) exports %	-100	0	0

Step 3, to the D obtained in step 2_fPAnd D_fNSignal carry out respectively linear R L speed limit (Rate Limit, RL) calculation process obtains D₂Signal and D₃Signal,

The RL speed limit operation function of non-linear speed limit calculation process has 3 input signals, respectively input signals R_in, upper cycle operation result R_out(n-1)Arranging parameter R with rate limit, RL speed limit operation function has 1 Output signal R_out, RL speed limit operation function carries out computing according to following 2 kinds of situations:

1st kind of situation:

T is execution cycle time constant, and engineering unit is s, and general selection range is 0.05s～1s, when meetingTime, then this computing R_outOutput is pressed formula and is calculated:

R_out=RL (R_in,R_out(n-1), R) and=R_in

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

2nd kind of situation:

WhenTime, then this computing R_outOutput is pressed formula and is calculated:

$R_{\mathrm{out}}=\mathrm{RL}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)},R)=\left\{\begin{array}{cc}{R}_{\mathrm{out}(n-1)}+R& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_{\mathrm{out}(n-1)}-R& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

In DCS configuration loop, can directly use the rate limit block RL of DCS to realize RL speed limit Computing.

Step 3.1: positive component signal D_fPNon-linear speed limit calculation process, if rise computing, Then select bigger speed limit parameter value；If the computing declined, then select slower speed limit parameter value.By with Lower formula carries out speed limit parameter value R_PSelection calculate:

$R_P=f_{\mathrm{RP}}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)})=\left\{\begin{array}{cc}{R}_f& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_s& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

In formula, R_fFor higher rate constraining parameters constant, this constant is adjustable parameter, and unit is %/s, allusion quotation Offset is 1000%/s；R_sFor slower rate constraining parameters constant, this constant is adjustable parameter, according to specifically The Characteristics of Low Frequency Oscillations frequency of electrical network and generating set capacity adjust, and representative value is 0.25%/s.

In DCS configuration loop, it is possible to use the deviation computing block △ of DCS, ceiling value alarming block H/, Signal handoff block T realizes R_PCalculating.As it is shown in figure 1, work as D₂-D_fp> 0 time, then signal handoff block T selects R_fAs output signal, and output valve is assigned to R_P；Work as D₂-D_fpWhen≤0, then signal handoff block T selects R_sFor output signal, and output valve is assigned to R_P。

Obtain R_PAfter, to D_fPCarry out RL speed limit functional operation, obtain D₂Signal, is calculated as follows:

D₂=RL (D_fP,D_2(n-1),R_P)

Obtain D₂After, its value is assigned to D_2(n-1), in order to called when next execution cycle:

D_2(n-1)=D₂

Step 3.2: negative value component signal D_fNNon-linear speed limit calculation process, if the computing risen, then Select slower speed limit parameter value；If the computing declined, then select higher speed limit parameter value.Press public affairs Formula carries out speed limit parameter value R_NSelection calculate:

$R_N=f_{\mathrm{RN}}(R_{\mathrm{in}},R_{\mathrm{out}(n-1)})=\left\{\begin{array}{cc}{R}_s& \left(R_{\mathrm{in}}{>R}_{\mathrm{out}(n-1)}\right)\\ R_f& (R_{\mathrm{in}}\&le;R_{\mathrm{out}(n-1)})\end{array}\right.$

In DCS configuration loop, it is possible to use the deviation computing block △ of DCS, ceiling value alarming block H/, Signal handoff block T realizes R_NCalculating.As it is shown in figure 1, work as D₃-D_fN> 0 time, then signal handoff block T selects R_sAs output signal, and output valve is assigned to R_N；Work as D₃-D_fNWhen≤0, then signal handoff block T selects R_fFor output signal, and output valve is assigned to R_N。

Obtain R_NAfter, to D_fNCarry out RL speed limit functional operation, obtain D₃Signal, is calculated as follows:

D₃=RL (D_fN,D_3(n-1),R_N)

Obtain D₃After, its value is assigned to D_3(n-1), in order to called when next execution cycle:

D_3(n-1)=D₃

Step 4: by D calculated in step 1₁, calculated D in step 3₂And D₃Add up mutually, Obtain calculate treatment loop output signal OUT:

OUT=D₁+D₂+D₃

Calculated calculating treatment loop OUT signal is substituted former generating set primary frequency regulation control in loop Control output order carry out primary frequency modulation control.

Fig. 2 is a 600MW generating set primary frequency regulation control drawing being typically made up of DCS, WS in figure is turbine speed signal, and unit is r/min；WS_rFor specified turn, for constant value 3000r/min； DEH_X151 is the primary frequency modulation command signal with % dimension, and unit is %, and this signal delivers to DEH (Digital Electro-Hydraulic Control System, DEH) pitch command drcuit, be directly superimposed to DEH pitch In instruction；DEH_X is the primary frequency modulation command signal after being converted to dimension MW, and unit is MW, this letter Number deliver to CCS (Coordinated Control System, CCS) power instruction loop, as CCS system Primary frequency modulation command signal.

In fig. 2, frequency difference (WS is calculated first with deviation computing block △_rWS), one point is then utilized Section linear interpolation function block f (x) realizes 5% speed governor droop, 2r/min Regulation dead-band and 6% frequency modulation instruction limit The functions such as width, are calculated by piecewise linear interpolation by following function point and realize:

F (x) inputs r/min	-150	-11	-2	0	2	11	150
								F (x) exports %	6	6	0	0	0	-6	-6

In fig. 2, when primary frequency modulation puts into, by signal handoff block T, select piecewise linear interpolation function The output of block f (x) is as DEH_X151 primary frequency modulation command signal；When exiting primary frequency modulation, once adjust Frequently command signal DEH_X151 is 0%.This unit rated power is 600MW, then from the dimension of % to MW Dimension conversion coefficient be 3.6, DEH_X151 × 3.6 just obtain the primary frequency modulation command signal that dimension is MW DEH_X。

Piecewise linear interpolation function in this units present invention, the access present invention that only need to connect to Fig. 2 The outfan of block f (x), as shown in Figure 3.

In figure 3, in order to make control drawing succinct, clear, present invention DCS configuration is packaged into one Individual grand computing module, and it is named as NLGPSS.Damping action partition coefficient K_rParameter value is 0.8；Speed Limit parameter R_fValue is 1000%/s；Rate constraining parameters R_sValue is 0.25%/s.

In order to realize the input of GPSS function/exit operation, in figure 3, also add a signal switching Block T, when putting into GPSS function, selects the OUT output as signal handoff block T of the present invention；When When exiting GPSS function, select the output of original piecewise linear interpolation functional blocks f (x) as signal handoff block The output of T.

Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended Claim is as the criterion.

Claims (3)

1. a generating set primary frequency regulation non-linear governor-side PSS control method, its feature Being, the output instruction signal controlled generating set primary frequency regulation in loop is carried out at non-linear speed limit calculating Reason, is carried out the output instruction signal processed in gained signal substituting former generating set primary frequency regulation control loop Primary frequency modulation controls,

The described output instruction signal controlled generating set primary frequency regulation in loop carries out non-linear speed limit meter Calculation processes, and step is as follows:

Step 1, controls generating set primary frequency regulation the output instruction signal in loop and delivers to calculate treatment loop IN input, be D by computing by IN signal decomposition₁And D_fThe signal of two components, as follows Carry out:

D₁=(1-K_r)·IN

D_f=K_r·IN

In formula, K_rFor damping action intensive parameter constant；

Step 2, to the D obtained in step 1_fSignal carries out calculating process, is split as positive component signal D_fPWith negative value component signal D_fN, calculate and carry out as follows:

$D_{fP}=f_1\left(D_f\right)=\left\{\begin{array}{cc}{D}_f& D_f\&GreaterEqual;0\\ 0& D_f<0\end{array}\right.$

$D_{fN}=f_2\left(D_f\right)=\left\{\begin{array}{cc}0& D_f\&GreaterEqual;0\\ D_f& D_f<0\end{array}\right.$

Step 3, to the D obtained in step 2_fPAnd D_fNSignal carries out non-linear speed limit calculation process respectively, Obtain D₂Signal and D₃Signal,

The speed limit operation function of non-linear speed limit calculation process has 3 input signals, respectively input signals R_in、 Upper cycle operation result R_out(n-1)Arranging parameter R with rate limit, speed limit operation function has 1 output signal R_out, speed limit operation function carries out computing according to following 2 kinds of situations:

1st kind of situation:

T is execution cycle time constant, and engineering unit is s, when meetingTime, then this Computing R_outOutput calculates as follows:

R_out=RL (R_in,R_out(n-1), R) and=R_in

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

2nd kind of situation:

WhenTime, then this computing R_outOutput calculates as follows:

$R_{out}=RL\left(R_{in},R_{out\left(n-1\right)},R\right)=\left\{\begin{array}{cc}{R}_{out\left(n-1\right)}+R& R_{in}>R_{out\left(n-1\right)}\\ R_{out}\left(n-1\right)-R& R_{in}\&le;R_{out\left(n-1\right)}\end{array}\right.$

Obtain R_outAfter, its value is assigned to R_out(n-1), in order to called when next execution cycle:

R_out(n-1)=R_out

Step 3.1: positive component signal D_fPNon-linear speed limit calculation process, if rise computing, Then select higher speed limit parameter value；If decline computing, then select slower speed limit parameter value, by with Lower formula carries out speed limit parameter value R_PSelection calculate:

$R_P=f_{RP}(R_{in},R_{out(n-1)})=\left\{\begin{array}{cc}{R}_f& R_{in}>R_{out(n-1)}\\ R_s& R_{in}\&le;R_{out(n-1)}\end{array}\right.$

In formula, R_fFor higher speed limit parameter constant, R_sFor slower speed limit parameter constant,

Obtain R_PAfter, to D_fPCarry out RL speed limit functional operation, obtain D₂Signal, is calculated as follows:

D₂=RL (D_fP,D_2(n-1),R_P)

Obtain D₂After, its value is assigned to D_2(n-1), in order to called when next execution cycle:

D_2(n-1)=D₂

Step 3.2: negative value component signal D_fNNon-linear speed limit calculation process, if the computing risen, then Select slower speed limit parameter value；If the computing declined, then select higher speed limit parameter value, by following Formula carries out speed limit parameter value R_NSelection calculate:

$R_N=f_{RN}(R_{in},R_{out(n-1)})=\left\{\begin{array}{cc}{R}_s& R_{in}>R_{out(n-1)}\\ R_f& R_{in}\&le;R_{out(n-1)}\end{array}\right.$

Obtain R_NAfter, to D_fNCarry out RL speed limit functional operation, obtain D₃Signal, is calculated as follows:

D₃=RL (D_fN,D_3(n-1),R_N)

Obtain D₃After, its value is assigned to D_3(n-1), in order to called when next execution cycle:

D_3(n-1)=D₃

Step 4: by D calculated in step 1₁, calculated D in step 3₂And D₃Add up mutually, Obtain calculate treatment loop output signal OUT:

OUT=D₁+D₂+D₃

Calculated calculating treatment loop OUT signal is substituted former generating set primary frequency regulation control in loop Output instruction signal carry out primary frequency modulation control.

The non-linear governor-side PSS of generating set primary frequency regulation the most according to claim 1 Control method, it is characterised in that

Damping action intensive parameter constant K_rFor adjustable parameter, its span is 0～1；

The selection range of execution cycle time constant T is 0.05s～0.1s；

Higher speed limit parameter constant R_fFor adjustable parameter, engineering unit is %/s, selection range be 100～ 1000；

Slower speed limit parameter constant R_sFor adjustable parameter, engineering unit is %/s, according to the low frequency of concrete electrical network Oscillating characteristic-frequency and generating set capacity adjust, and selection range is 0.1～1.

The non-linear governor-side PSS of generating set primary frequency regulation the most according to claim 2 Control method, it is characterised in that

Damping action intensive parameter constant K_rIt is 0.8；

Speed limit parameter constant R_fFor 1000%/s；

Speed limit parameter constant R_sFor 0.25%/s.