CN114204609A

CN114204609A - Primary frequency modulation transfer adjustment method based on active power adjustment dead zone

Info

Publication number: CN114204609A
Application number: CN202111306920.2A
Authority: CN
Inventors: 胡林; 崔海涛; 吴威; 虞晓昕; 陶卿; 魏超; 刘松
Original assignee: Huaneng Lancang River Hydropower Co Ltd
Current assignee: Huaneng Lancang River Hydropower Co Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-03-18
Anticipated expiration: 2041-11-05
Also published as: CN114204609B

Abstract

The invention discloses a primary frequency modulation transfer adjustment method based on an active power adjustment dead zone, which aims to prevent the unit active power adjustment dead zone from possibly causing adverse effects on primary frequency modulation qualification rate, sharpens the resolution of primary frequency modulation, and sets the primary frequency modulation target adjustment quantity to be enhanced in order to ensure that the deviation of a unit active power target value and a unit active power actual value after primary frequency modulation adjustment quantity is superposed exceeds the active power adjustment dead zone; or the strategy of reducing the active power regulation dead zone of the unit in the primary frequency modulation action process and an open-loop feedforward regulation link for carrying out auxiliary regulation on the primary frequency modulation. The invention ensures that effective primary frequency modulation regulation can be generated even if the deviation of the target value of the active power of the unit and the actual value of the active power of the unit after the primary frequency modulation regulation quantity is superposed does not exceed the dead zone of the active power regulation; and meanwhile, the adverse effect of the unit active power regulation dead zone on the primary frequency modulation qualification rate is prevented.

Description

Primary frequency modulation transfer adjustment method based on active power adjustment dead zone

Technical Field

The invention belongs to the technical field of hydroelectric frequency modulation, and relates to a primary frequency modulation transfer adjusting method based on an active power adjusting dead zone.

Background

The active power regulation mode of the current domestic hydropower station mainly comprises a speed regulator power mode and a speed regulator opening mode; the difference between the two is that: under the speed regulator power mode, the speed regulator performs closed-loop feedback regulation on the real unit active power value according to the target unit active power value, typically, the speed regulator power mode is used for performing active power regulation on three gorges power stations, stream-luodie power stations, and power stations facing to a home dam; under the opening mode of the speed regulator, a monitoring system sends out regulating pulses to the speed regulator according to the deviation of a unit active power target value and a unit active power actual value, a guide vane opening set value of the speed regulator is corrected, the speed regulator carries out closed-loop feedback regulation on the guide vane opening according to the guide vane opening target value, and the active power regulation is carried out in the opening mode of the speed regulator typically in a glutinous rice ferry power station, a small bay power station, a diffuse bay power station, a landscape flood power station, a dragon opening power station and the like.

In the opening mode of the speed regulator, if the coordination control of the primary and secondary frequency modulation is not processed, the conflict between the primary frequency modulation and the secondary frequency modulation may occur, and the most common situation is that the secondary frequency modulation regards the adjustment amount of the primary frequency modulation as disturbance and offsets or pulls back the adjustment amount of the primary frequency modulation, so that the primary frequency modulation cannot achieve the expected adjustment effect. For such a situation, in current practice, control strategies of locking primary frequency modulation or locking secondary frequency modulation in different working conditions are mainly adopted, for example: after secondary frequency modulation is finished, locking a secondary frequency modulation function of the unit unless a new unit active power set value is received, and after the secondary frequency modulation function is locked, even if the real unit active power value deviates from the unit active power set value or the target value exceeds the active power regulation dead zone, a secondary frequency modulation closed loop feedback regulation mechanism of the unit is not started.

Practice proves that, as the control strategy for preventing the conflict of the first secondary frequency modulation by the locking means, although the conflict problem of the second frequency modulation can be relieved to a certain extent, the control strategy still has great defects, the overall complexity of the active power control strategy is mainly increased, the stability of the active power control function is reduced under partial working conditions, the monitoring and stabilizing mechanism and the like of the active power actual value originally possessed by the secondary frequency modulation closed loop feedback regulation function of the unit are broken, and therefore a series of new problems are caused, and the safe and stable operation of the hydropower station is influenced to a certain extent.

Disclosure of Invention

The invention solves the technical problem of providing a primary frequency modulation transfer adjustment method based on an active power adjustment dead zone, sharpening the resolution of primary frequency modulation, and preventing the unit active power adjustment dead zone from possibly causing adverse effects on the primary frequency modulation qualification rate.

The invention is realized by the following technical scheme:

a primary frequency modulation transfer adjusting method based on an active power adjusting dead zone is characterized in that a monitoring system performs transfer type adjustment on primary frequency modulation and secondary frequency modulation of a hydroelectric generating set, and the method comprises the following operations:

s1100) the lower computer of the monitoring system receives the set active power set value p issued by the scheduling mechanism through the secondary frequency modulation instruction_s；

S1200) the lower computer of the monitoring system calculates the primary frequency modulation target power regulating quantity p_fWhen the primary frequency modulation function is not put in, p_fIs 0; when put in, p_fThe rated capacity of the unit is multiplied by a primary frequency modulation power regulation coefficient multiplied by delta f, and the delta f is the deviation for primary frequency modulation calculation of the power grid frequency and the rated frequency;

s1300) based on comparison between the real unit active power value and the unit active power regulation dead zone range, the lower computer of the monitoring system corrects the primary frequency regulation target regulation quantity to obtain a unit active power superposed value variable delta p;

s1400) carrying out open-loop feedforward adjustment for auxiliary adjustment on the primary frequency modulation by the lower computer of the monitoring system;

s1500) calculating an active power target value p by the lower computer of the monitoring system_t，p_t＝p_s+Δp；

S1600) the lower position of the monitoring system corrects the unit active power regulation dead zone, carries out active power closed-loop regulation on the basis of the corrected unit active power regulation dead zone, carries out reverse locking on open-loop feedforward regulation, corrects the open pulse length of an increasing/decreasing guide vane opening relay, and then sends an increasing guide vane opening open pulse or a decreasing guide vane opening pulse to a speed regulator system;

the speed regulator system receives the length of the opening pulse of the guide vane increasing or the length of the opening pulse of the guide vane decreasing, and corrects the set value of the guide vane opening; and performing closed-loop feedback adjustment on the opening degree of the guide vane according to the set value of the opening degree of the guide vane, so that the actual value of the opening degree of the guide vane tends to the set value of the opening degree of the guide vane and is finally stabilized in the range of a dead zone for adjusting the opening degree of the guide vane of the set value of the opening degree of the guide vane.

Further, the monitoring system upper computer also performs the following self-diagnosis on the primary frequency modulation adjustment quality:

s2100) calculating theoretical integral quantity and actual integral quantity of primary frequency modulation adjustment of each unit by an upper computer of the monitoring system;

s2200) setting an auxiliary parameter, z, for calculating the primary FM quality₁、z₂、z₃、z₄The method comprises the following steps:

S2210)k₃＞z₁＞z₂＞z₃＞z₄＞k₄wherein k is₃The upper limit threshold coefficient k of the primary frequency modulation power regulating quantity of the unit₄A lower limit threshold coefficient of a unit primary frequency modulation power regulating quantity is obtained;

S2220)z₁+z₄＝2，z₂+z₃＝2；

s2300) calculating the adjusting quality of the primary frequency modulation of each unit, including:

s2310) setting an admission threshold value for calculating the adjustment quality of the primary frequency modulation;

s2320) comparing the absolute value of the theoretical integral quantity of the primary frequency modulation of each unit with the access threshold value for calculating the adjustment quality of the primary frequency modulation, and calculating the adjustment quality of the primary frequency modulation through subsequent steps when the absolute value is larger than or equal to the access threshold value; when the former is smaller than the latter, skipping the subsequent steps and not calculating the adjustment quality of the primary frequency modulation;

s2330) dividing the actual integral quantity of the primary frequency modulation adjustment of the unit by the theoretical integral quantity of the primary frequency modulation adjustment to obtain the integral proportion of the primary frequency modulation adjustment of the unit;

s2340) judging the primary frequency modulation adjusting quality of the unit according to the integral proportion of the primary frequency modulation adjustment of the unit, and generating an adjusting quality parameter E, wherein the method comprises the following steps:

s2341) setting value parameters of alpha, beta, gamma and delta, wherein alpha is more than 0 and less than beta and less than gamma and less than delta;

s2342) adjusting the integral ratio of the unit primary frequency modulation at z₂And z₃In the meantime, the primary frequency modulation adjustment quality of the unit is considered to be very ideal, and the adjustment quality parameter E is 0;

s2343) when the integral ratio of the unit primary frequency modulation adjustment is in z₁And z₂In the meantime, the primary frequency modulation adjustment quality of the unit is considered to be higher in adjustment quantity, and an adjustment quality parameter E is alpha;

s2344) when the integral ratio of the unit primary frequency modulation adjustment is in z₃And z₄In the meantime, the primary frequency modulation adjustment quality of the unit is considered to be low, and the adjustment quality parameter E is-alpha;

s2345) when the integral ratio of the unit primary frequency modulation adjustment is k₃And z₁In the meantime, the primary frequency modulation adjustment quality of the unit is considered to be extremely high, and the adjustment quality parameter E is beta;

s2346) when the integral ratio of the unit primary frequency modulation adjustment is in z₄And k is₄In the middle, the primary frequency modulation adjustment quality of the unit is considered to be extremely low, and the adjustment quality parameter E is-beta;

s2347) integral ratio of primary frequency modulation adjustment of machine setExample exceeds k₃When the primary frequency modulation adjustment quality of the unit is considered as the adjustment overshoot, and the adjustment quality parameter E is gamma;

s2348) when the integral ratio of the unit primary frequency modulation adjustment is 0 and k₄In the meantime, the primary frequency modulation adjustment quality of the unit is considered to be not up to the standard, and the adjustment quality parameter E is equal to-gamma;

s2349) when the integral proportion of the primary frequency modulation adjustment of the unit is smaller than 0, the primary frequency modulation adjustment quality of the unit is considered to have an opposite effect on the stability of the power grid frequency, and the adjustment quality parameter E is-delta;

s2400) the upper computer of the monitoring system carries out self-diagnosis on the primary frequency modulation function according to the primary frequency modulation adjustment quality parameter E of each unit, and carries out water head proportional coefficient k according to the diagnosis result_wOr an alarm of abnormal primary frequency modulation function is sent out.

Compared with the prior art, the invention has the following beneficial technical effects:

the primary frequency modulation transfer adjusting method based on the active power adjusting dead zone, provided by the invention, considers that the monitoring system is the only adjusting mechanism of the primary frequency modulation, so that the influence of the power grid frequency deviation in the monitoring system is enhanced as much as possible to ensure the effective action of the primary frequency modulation adjustment; in order to prevent the unit active power regulation dead zone from possibly causing adverse effects on the primary frequency modulation qualification rate, the resolution of the primary frequency modulation is sharpened, and the method comprises the steps of enhancing the primary frequency modulation target regulation quantity in order to ensure that the deviation of the unit active power target value and the unit active power actual value after the primary frequency modulation regulation quantity is superposed exceeds the active power regulation dead zone; or a strategy for reducing the active power regulation dead zone of the unit in the primary frequency modulation action process, and an effective open-loop feedforward regulation strategy for primary frequency modulation regulation can be generated in order to ensure that the deviation between the target value of the active power of the unit and the actual value of the active power of the unit after the primary frequency modulation regulation is superposed does not exceed the active power regulation dead zone.

In the open-loop feedforward adjustment link for performing auxiliary adjustment on primary frequency modulation, the variable water head proportionality coefficient is set in consideration of the great influence of water head change on the correlation between the active power actual value of the unit and the opening degree of the guide vane, and a related strategy for automatically correcting the water head proportionality coefficient according to the adjustment quality of the primary frequency modulation for a plurality of times in the past is designed.

Drawings

FIG. 1 is a flow chart of a primary frequency modulation-to-modulation mode of the present invention;

FIG. 2 is a schematic diagram illustrating a variation of a dead zone range of a unit active power target value after a primary frequency modulation target adjustment quantity is corrected according to the present invention;

FIG. 3 is a schematic diagram of the variation of the dead zone range of the unit active power target value without correcting the primary frequency modulation target adjustment quantity according to the present invention;

FIG. 4 is a schematic diagram of a primary frequency modulation adjusting effect of the present invention after a unit active power adjusting dead zone is corrected;

FIG. 5 is a schematic diagram of the primary frequency modulation adjusting effect of the present invention without modifying the active power adjusting dead zone of the unit;

fig. 6 is a logic schematic diagram of the calculation of the opening pulse length of the guide vane increasing/decreasing opening relay by the lower computer of the primary frequency modulation transfer mode monitoring system.

Detailed Description

The present invention will now be described in further detail with reference to the following examples, which are intended to be illustrative, but not limiting, of the invention.

As shown in fig. 1, a primary frequency modulation transfer adjustment method based on an active power adjustment dead zone, in which a monitoring system performs transfer-type adjustment on primary frequency modulation and secondary frequency modulation of a hydroelectric generating set, includes the following operations:

The steps and the adjustment strategy are specifically described below with reference to the examples.

As shown in fig. 1, a primary frequency modulation transfer regulation method based on an active power regulation dead zone includes the following operations:

S1200), calculating a target power regulating quantity of primary frequency modulation by the lower computer of the monitoring system, wherein the target power regulating quantity comprises the following steps:

s1210) when the primary frequency modulation function is not put into use, adjusting the primary frequency modulation target power by a quantity p_fIs 0;

s1220) when primary frequency modulation is put into use, adjusting quantity p of primary frequency modulation target power_fRated capacity of the unit is multiplied by primary frequency modulation power regulation coefficient is multiplied by delta f, whereinThe primary modulation adjustment factor is predetermined by the scheduling mechanism.

S1300) correcting the primary frequency modulation target regulating quantity to obtain a unit active power superposed value variable delta p:

s1310) setting a unit active power superposition value variable Δ p, where Δ p is p when the strategy for correcting the primary frequency modulation target adjustment amount is set to be invalid_fWhen the strategy for correcting the primary frequency modulation target adjustment amount is set to be effective, calculating Δ p according to the following steps S1320 to S1340;

s1320) setting a proportionality coefficient k for correcting the primary adjustment target amount₆、k₇,k₆>1,k ₇1, this example assumes k₆Is 1.1, k₇Is 1.2;

s1330) adjusting the target adjustment quantity p when primary frequency modulation is performed_fWhen the value is equal to 0, the unit active power superposition value variable delta p is assigned to be 0, and the value is equal to 0;

s1340) adjusting the target adjustment quantity p when primary frequency modulation is carried out_fWhen not equal to 0, the active power superposition value variable delta p of the unit is set, and the method comprises the following steps:

s1341) if the real unit active power output value p is outside the unit active power regulation dead zone range of the set unit active power set value, that is, p is more than p_s+p_dOr p < p_s－p_d，p_dAdjusting the size of the dead zone for the active power of the unit, and adjusting the primary frequency modulation target adjustment quantity p_fIs assigned to Δ p, Δ p ═ p_f；

S1342) if the real unit active power output value is within the unit active power regulation dead zone range of the set unit active power set value, namely p_s－p_d≤p≤p_s+p_dAnd the primary frequency modulation target adjustment amount p_fIf > 0, Δ p ═ max [ (p + p)_d－p_s)×k₆，p_f×k₇]；

S1343) if the real unit active power output value is within the unit active power regulation dead zone range of the set unit active power set value, namely p_s－p_d≤p≤p_s+p_dAnd primary frequency modulation target adjustment amountp_fIf < 0, Δ p ═ min [ (p-p)_d－p_s)×k₆，p_f×k₇]。

Assuming that the set value of the active power of the unit is 200MW, the real value of the active power is 190MW, and the dead zone of the active power regulation is 20MW, when the primary frequency modulation target regulation quantity p_fWhen the assigned power changes from-40 MW to 40MW, the active power target value p of the unit is calculated by adopting the strategy S1300_t(p_t＝p_sAnd + Δ p) the change of the dead zone range is shown in fig. 2, and the change of the dead zone range of the unit active power target value calculated without adopting the strategy described in S1300 is shown in fig. 3. As is apparent from comparison between fig. 2 and fig. 3, the strategy in S1300 has an effect of preventing the real power value of the unit from being within the dead zone range of the target value of the active power of the unit during the primary frequency modulation action, so as to provide guarantee for effective adjustment of the primary frequency modulation.

S1400) open-loop feed-forward regulation for secondary regulation of primary frequency modulation, comprising:

s1410) setting the open pulse length t as a reference_bsActive power adjustment step p as reference_bsHead value w as a reference_bs；

S1420) setting a water head proportionality coefficient k_wThe optional setting method includes:

s1421) according to the current head value w to k_wCarry out the calculation of k_w＝(w_bs÷w)^(3/2)The formula is from the correlation between the output of the water turbine and the water head;

s1422) dividing the possible fluctuation range of the water head into a plurality of intervals, setting 1 proportionality coefficient parameter for each interval, wherein the set proportionality coefficient parameter is in (w)_bs÷w_dw)^(3/2)、(w_bs÷w_up)^(3/2)In which w_upThe upper limit of the water head, w, of the interval_dwFor the lower limit of the water head of the interval, when the actual water head w is in a certain interval, the water head proportionality coefficient k is calculated_wSetting the proportional coefficient parameter corresponding to the interval;

s1423) adjusting the quality of the primary frequency modulation by the upper computer of the monitoring systemCoefficient of proportionality to head k_wThe setting is performed.

S1430) setting a variable delta p 'for storing the active power superposition value of the unit in the previous period, and assigning the delta p to the delta p' in each calculation period, namely the delta p is equal to the delta p;

s1440) target adjustment quantity p of primary frequency modulation_fWhen the frequency is more than 0, calculating the increased active power open loop feedforward adjustment pulse length t for carrying out auxiliary adjustment on the primary frequency modulation_uThe method comprises the following steps:

s1441) comparing the variable delta p 'of the active power superposition value of the last period unit with the variable delta p of the active power superposition value of the last period unit, and if the delta p' is more than or equal to the delta p, t is_u＝0；

S1442) if Δ p' < Δ p, t_u＝t_bs×(Δp－Δp’)÷p_bs×k_w；

S1443) setting an augmented activity feedforward adjustment identification S_uAnd a timer T₁；

S1444) when t is_uWhen changing from 0 to non-0, s is set_uTo 1, set T₁Is t_uAnd start T₁The countdown;

s1445) at timer T₁During the countdown, T is counted in each cycle₁Is assigned to t_uAnd when the timer T is started₁When the countdown reaches 0, set s_uIs 0.

Example assume t_bs×÷p_bs×k_wWhen the primary frequency modulation target adjustment quantity p is equal to 0.5_fWhen the pulse length is more than 0, the active open loop feedforward is increased to adjust the pulse length t_uThe relationship with the unit active power superposition value is shown in the following table:

period of time	Δp’	Δp	t_u	Period of time	Δp’	Δp	t	_u
									1	10.69	12.99	1.15	6	17.98	15.02	0
2	12.99	15.92	1.46	7	15.02	16.51	0.75
								3	15.92	12.03	0	8	16.51	17.96	0.73
4	12.03	16.36	2.16	9	17.96	12.33	0
								5	16.36	17.98	0.81	10	12.33	16.01	1.84

S1450) adjusting the primary frequency modulation target adjustment amount p_fWhen the frequency is less than 0, calculating the length t of the active power reducing open loop feedforward regulation pulse for carrying out auxiliary regulation on the primary frequency modulation_dThe method comprises the following steps:

s1451) comparing the variable delta p 'of the active power superposition value of the last period unit with the variable delta p of the active power superposition value of the last period unit, wherein if the delta p' is less than or equal to the delta p, t is_d＝0；

S1452) if Δ p' > Δ p, t_d＝t_bs×(Δp’－Δp)÷p_bs×k_w；

S1453) setting a power reduction feedforward adjustment mark S_dAnd a timer T₂；

S1454) at t_dWhen changing from 0 to non-0, s is set_dTo 1, set T₂Is t_dAnd start T₂The countdown;

s1455) at timer T₂During each cycle of the countdown process, willT₂Is assigned to t_dAnd when the timer T is started₂When the countdown reaches 0, set s_dIs 0.

S1460) target primary frequency modulation adjustment quantity p_fWhen the value is less than or equal to 0, set s_uWhen the primary frequency modulation target adjustment quantity p is equal to 0_fWhen s is more than or equal to 0, set_d＝0。

S1600) correcting the unit active power regulation dead zone:

s1610), when the strategy for correcting the unit active power regulation dead zone is set to be invalid, the unit active power regulation dead zone is kept unchanged, and when the strategy for correcting the primary frequency modulation target regulation is set to be valid, the unit active power regulation dead zone p is corrected according to the following steps S1620 to S1640_dAnd (3) calculating:

s1620) setting a proportionality coefficient k for correcting the unit active power regulation dead zone₈，k₈< 1, it is assumed according to the embodiment of S3511 that the primary frequency modulation evaluation threshold power adjustment amount p_gThe rated capacity of the unit is 0.6%, and k is obviously set under the condition that the conventionally set active power regulation dead zone of the unit is 1% of the rated capacity of the unit₈The setting is 0.5, the unit active power regulation dead zone in the primary frequency modulation action process is reduced to 0.5% of the rated capacity of the unit, and the method undoubtedly plays a significant positive role in guaranteeing the qualification rate of primary frequency modulation regulation of scheduling evaluation.

S1630) adjusting the target adjustment quantity p when primary frequency modulation is performed_fWhen the active power of the unit is equal to 0, the dead zone of the active power regulation of the unit is kept unchanged;

s1640) adjusting the primary frequency modulation target adjustment quantity p_fWhen not equal to 0, reducing the active power regulation dead zone p of the unit_d，p_d＝p_d×k₈。

The reduction effect and the primary frequency modulation adjusting effect of the unit active power adjusting dead zone adopting the strategy of S1600 are shown in FIG. 4 (one-time frequency modulation action at 15 seconds, one-time frequency modulation recovery at 60 seconds, the dead zone is set to be 20MW, and the correction proportionality coefficient k₈Set to 0.5), the dead zone of the unit active power regulation and the primary frequency modulation regulation effect without adopting the strategy described in S1600 are shown in fig. 5. As is apparent from comparison between fig. 4 and fig. 5, the strategy in S1600 also has the function of preventing the real active power value of the unit from being within the dead zone range of the target active power value of the unit during the primary frequency modulation action, so as to provide guarantee for effective adjustment of the primary frequency modulation.

S1700) the lower computer of the monitoring system participates in the closed-loop feedback regulation of the active power of the unit according to the conventional logic of the opening regulation mode of the active power speed regulator of the hydropower station, and the logic flow is shown in figure 6 and comprises the following steps:

s1710) when the unit active power target value p_tIs greater than the active power real emission value p of the unit, and the absolute value of the difference value between the two is greater than the active power regulation dead zone p of the unit_dIn the time, the lower computer of the monitoring system calculates the opening pulse length t of the opening relay of the guide vane increasing opening degree through the preset active power closed loop regulation function_upMeanwhile, the opening pulse length t of the relay for reducing the opening degree of the guide vane_dwIs set to 0, where p_dAdjusting dead zone p by using unit active power obtained in S1600_d；

S1720) when the unit active power target value p_tIs less than the real power value p of the unit and the absolute value of the difference between the two is greater than the active power regulation dead zone p of the unit_dIn the time, the lower computer of the monitoring system calculates the opening pulse length t of the guide vane opening reducing relay through a preset active power closed loop regulating function_dwMeanwhile, the opening pulse length t of the opening relay of the guide vane is increased_upIs set to 0, where p_dAdjusting dead zone p by using unit active power obtained in S1600_d；

S1730) according to the calculation results of S1710 and S1720, carrying out reverse locking on the open-loop feedforward regulation of the auxiliary primary frequency modulation regulation to prevent the speed regulator from simultaneously receiving the opening degree command of the guide vanes increasing and the opening degree command of the guide vanes decreasing, and the method comprises the following steps:

s1731) increasing the opening degree of the guide vane by the pulse length t of the opening relay_upIf the value is more than 0, the active feed-forward regulation mark s is reduced_dSet to 0, otherwise hold s_dThe change is not changed;

s1732) opening pulse length t of relay if reducing guide vane opening_dwIf the value is more than 0, an active feedforward adjustment mark s is added_uSet to 0, otherwise hold s_uAnd is not changed.

S1740) opening pulse length t of opening blade opening degree relay_upPerforming a correction comprising:

s1741) if the active feed-forward regulation mark S is added_u0, or increasing the opening of the guide vane opening relay_upThe length t of the open loop feedforward adjusting pulse of the increased active power is more than or equal to_uThen, t is maintained_upThe change is not changed;

s1742) if the active feed-forward regulation mark S is added_u1, and increasing the opening pulse length t of the guide vane opening degree relay_upLess than increased active open loop feedforward adjustment pulse length t_uAssigning the increased active open-loop feedforward regulation pulse length to the increased guide vane opening degree relay to obtain the pulse length, namely t_up＝t_u；

S1743) sending out and t) according to the opening pulse length of the opening relay of the guide vane increasing opening degree_upEqual length open pulses to the governor system.

S1750) opening pulse length t of reducing guide vane opening relay_dwPerforming a correction comprising:

s1751) if active feed-forward regulation mark S is reduced_d0, or reducing the opening of the guide vane_dwActive power open loop feedforward adjustment pulse length t is more than or equal to_dThen, t is maintained_dwThe change is not changed;

s1752) if active feed-forward regulation mark S is reduced_d1, and reducing the opening pulse length t of the guide vane opening degree relay_dwLess than the subtractive active open loop feedforward adjustment pulse length t_dAssigning the length of the active power reducing open-loop feedforward regulation pulse to the length of the opening pulse of the reducing guide vane opening relay, namely t_dw＝t_d；

S1753) sending out and t) according to opening pulse length of the reducing guide vane opening relay_dwEqual length open pulses to the governor system.

S1800) speed regulator system adopting speed regulatorThe gauge strategy is that according to the length t of the opening pulse of the guide vane received from the lower computer of the monitoring system_upOr reducing the length t of the opening pulse of the guide vane_dwTo the opening degree set value g of the guide vane_sAnd correcting, and performing closed-loop feedback adjustment on the opening of the guide vane according to the set value of the opening of the guide vane to enable the actual value of the opening of the guide vane to approach the set value of the opening of the guide vane and finally stabilize the actual value of the opening of the guide vane in the range of the dead zone of the adjustment of the opening of the guide vane of the set value of the opening of the guide vane.

s2100) setting calculation of theoretical integral quantity and actual integral quantity of primary frequency modulation adjustment of each unit, including:

s2110) setting primary frequency modulation function input identification bits S of each unit_eThe method comprises the following steps:

s2111) when the unit primary frequency modulation function is monitored to be in the exit state, putting the unit primary frequency modulation function into an identification position S_eSet to 0;

s2112) when the unit primary frequency modulation function is in an input state, if the absolute value of the difference value between the power grid frequency and the rated frequency is larger than the hydropower primary frequency modulation threshold value, keeping the unit primary frequency modulation function input identification position S_eThe change is not changed;

s2113) when the unit primary frequency modulation function is in an input state, if the absolute value of the difference value between the power grid frequency and the rated frequency is less than or equal to the hydropower primary frequency modulation threshold value, inputting the unit primary frequency modulation function into an identification position S_eIs set to 1.

According to the strategy of S2110, a mark bit S_eMay include the following: 1) when the primary frequency modulation theoretically should act, if the primary frequency modulation function is in an exit state, the identification bit s_eIs 0; 2) when the primary frequency modulation is theoretically to be operated, if the primary frequency modulation function is in an on state, but before the primary frequency modulation operation is finished, the primary frequency modulation function is exited, the identification bit s_eIs 0; 3) when the primary frequency modulation should be operated theoretically, if the primary frequency modulation function is in the input state, and before the primary frequency modulation operation is finished, the primary frequency modulation is performedThe frequency function is always in the input state, then the identification bit s_eIs 1.

S2120) when the absolute value of the difference between the grid frequency and the rated frequency exceeds the hydroelectric primary frequency modulation threshold value, if the real power value of the unit is within the regulation dead zone range of the set value of the active power of the unit, the following operations are carried out, including:

s2121) starting a calculation process of a theoretical integral quantity and an actual integral quantity of primary frequency modulation regulation of each unit;

s2122) recording the real active power value of each unit at the current unit as a calculation reference value of the actual integral quantity;

s2123) recording the active power set value of each unit at present as a reference value for judging whether the active power set value of each unit changes;

s2124) starting timer T₃；

S2125) setting an identification bit S when the absolute value of the difference value between the power grid frequency and the rated frequency exceeds a primary frequency modulation frequency deviation evaluation threshold value_g，s_gIs 0;

s2126) setting an identification bit S when the primary frequency modulation actual action time exceeds the primary frequency modulation action time evaluation threshold value_t，s_tIs 0;

s2127) setting an identification position S of the change of the set value of the active power of the unit_c，s_cIs 1.

S2130) carrying out the following operations in each period of the calculation process of the theoretical integral quantity and the actual integral quantity of the primary frequency modulation regulation of each unit, wherein the operations comprise:

s2131) calculating primary frequency modulation target power regulating quantity p of each unit respectively_fSpaced from the cycle by a time t_fThe product of the first and second frequency modulation values is obtained to obtain the period theoretical integral quantity of the primary frequency modulation adjustment of each unit in the period,

s2132) respectively carrying out real sending on the active power real sending value p of each unit in the current period_sSubtracting the actual integral quantity calculation reference value, and calculating the interval time t between the calculation and the period_fObtaining the actual integral quantity of the cycle of the primary frequency modulation adjustment of each unit in the cycle;

s2133) comparing the absolute value of the difference between the power grid frequency and the rated frequency with the primary frequency modulation frequency deviation evaluation threshold value, and if the absolute value is larger than or equal to the primary frequency modulation frequency deviation evaluation threshold value, identifying the position S_gSetting the frequency value to be 1, otherwise, keeping the frequency value unchanged, and according to the evaluation condition of the primary frequency modulation action of the southern power grid, enabling the frequency peak value in the middle of the primary frequency modulation action to exceed an evaluation threshold (thermal power)>0.05Hz, hydroelectric power>0.065Hz) ", the embodiment sets the primary frequency modulation frequency deviation evaluation threshold value to 0.065 Hz;

s2134) comparing timer T₃Evaluating the threshold value with the primary frequency modulation action time, and when the former is greater than or equal to the latter, marking the position s_tSetting the evaluation threshold value to be 1, otherwise, keeping the evaluation threshold value unchanged, and according to the evaluation condition of the primary frequency modulation action of the southern power grid, wherein the duration of the primary frequency modulation action exceeds the specified action delay (thermal power 15s, hydroelectric power 15s), and the embodiment sets the evaluation threshold value of the primary frequency modulation action time to be 15 s;

s2135) monitoring the set active power set value of each unit, comparing the set active power set value with a reference value for judging whether the set active power set value changes, and identifying the set with the changed set active power set value by using an identification bit S_cAnd if not, the strategy is set according to the related regulation of 'avoidance for primary frequency modulation during secondary frequency modulation action' of the power grid.

S2140) when the absolute value of the difference between the power grid frequency and the rated frequency changes from being greater than the hydroelectric primary frequency modulation threshold value to being less than or equal to the hydroelectric primary frequency modulation threshold value, performing the following operations, including:

s2141) respectively accumulating the periodic theoretical integral quantity of the primary frequency modulation adjustment obtained in each period after the primary frequency modulation of each unit is started, and then multiplying the accumulated result by the identification bit S_gX identification bit s_tX identification bit s_cX identification bit s_eObtaining the theoretical integral quantity of the current primary frequency modulation adjustment of each unit;

s2142) respectively accumulating the period actual integral quantity of the primary frequency modulation adjustment obtained in each period after the primary frequency modulation of each unit is started, and then multiplying the accumulated result by the identification bit S_gX identification bit s_tX identification bit s_cX identification bit s_eObtaining the actual integral quantity of the current primary frequency modulation adjustment of each unit;

s2143) finishing the calculation process of the theoretical integral quantity and the actual integral quantity of the primary frequency modulation regulation of each unit.

S2210)k₃＞z₁＞z₂＞z₃＞z₄＞k₄wherein k is₃The upper limit threshold coefficient k of the primary frequency modulation power regulating quantity of the unit₄The lower limit threshold coefficient of the unit primary frequency modulation power regulating quantity is determined as the action qualification according to the evaluation condition of the primary frequency modulation action of the southern power grid, namely that the integral electric quantity of the primary frequency modulation action reaches 50% of the integral electric quantity of the theoretical action, and then k in the embodiment₄Should be set to 0.5, since the grid does not specify the qualified upper limit of the action integral electric quantity, k is according to the symmetry principle₃Can be set to 1.5;

S2220)z₁+z₄＝2，z₂+z₃assume according to the embodiment that if k is 2₄Set to 0.5, k₃Set to 1.5, then z may be considered₄Set to 0.65, z₃Set to 0.8, z₂Set to 1.2, z₃Set to 1.35;

s2320) comparing the absolute value of the theoretical integral quantity of the primary frequency modulation of each unit with the admission threshold value for calculating the adjustment quality of the primary frequency modulation, when the current value is greater than or equal to the latter value, calculating the adjustment quality of the primary frequency modulation through subsequent steps, and when the current value is less than the latter value, skipping the subsequent steps and not calculating the adjustment quality of the primary frequency modulation;

s2330) dividing the actual integral quantity of the primary frequency modulation adjustment of the unit by the theoretical integral quantity of the primary frequency modulation adjustment to obtain the integral proportion of the primary frequency modulation adjustment of the unit.

s2347) when the integral ratio of the unit primary frequency modulation adjustment exceeds k₃When the primary frequency modulation adjustment quality of the unit is considered as the adjustment overshoot, and the adjustment quality parameter E is gamma;

s2349) when the integral ratio of the primary frequency modulation adjustment of the unit is smaller than 0, the primary frequency modulation adjustment quality of the unit is considered to be an adverse effect on the frequency stability of the power grid, and the adjustment quality parameter E is- δ.

S2400) the upper computer of the monitoring system carries out self-diagnosis on the primary frequency modulation function according to the primary frequency modulation adjustment quality parameter E of each unit; and carrying out water head proportionality coefficient k according to the diagnosis result_wOr an alarm of abnormal primary frequency modulation function is sent out.

The coefficient of proportionality of the water head k_wThe method comprises the following operations when setting or switching:

s2410) setting a plurality of water head proportion parameters to be selected;

s2420) setting a parameter v, wherein v is greater than 0 and is an integer;

s2430) respectively constructing a No. 1 historical data array [ A ] for storing primary frequency modulation adjustment quality parameters for each unit₁、A₂、A₃、…、A_v]；

S2440) after the adjusting quality parameter E of the primary frequency modulation of the unit is obtained through calculation each time, assigning each variable of the No. 1 historical data array to an array variable which is obtained by adding 1 to the sequence, namely A_v＝A_v-1，A_v-1＝A_v-2，…，A₃＝A₂，A₂＝A₁And A is₁Assigned to the tuning quality parameter E, i.e. A₁＝E；

S2450) setting an ideal threshold value lambda of primary frequency modulation₁；

S2460) accumulating variables of the No. 1 historical data array by A-A₁+A₂+A₃+…+A_vAnd the accumulated result A and the ideal threshold value lambda of the primary frequency modulation are compared₁Performing a comparison comprising:

s2461) if- λ₁≤A≤λ₁Keeping the current water head proportionality coefficient unchanged;

s2462) if A < -lambda₁And if the integral proportion of the latest set primary frequency modulation adjustment obtained in the step S2330 is less than 0, keeping the current water head proportionality coefficient unchanged;

s2463) if A < lambda >₁And if the integral ratio of the latest set primary frequency modulation adjustment obtained in S2330 is greater than or equal to 0, then the water head ratio parameter set in S2410 is listedHaving parameters greater than the current head scaling factor, and selecting the smallest one of them as the head scaling factor k_wMeanwhile, clearing 0 for each variable of the No. 1 historical data array;

s2464) if A > λ₁Then, all the parameters smaller than the current head proportionality coefficient in the head proportionality parameters set in S2410 are listed, and the largest one is selected from them and set as the head proportionality coefficient k_wMeanwhile, the variables of the No. 1 historical data array are cleared to 0.

And under the following conditions, an alarm of abnormal primary frequency modulation function is issued under the following conditions:

if A < -lambda₁And if the integral proportion of the latest set primary frequency modulation adjustment obtained in the step S2330 is less than 0, keeping the current water head proportionality coefficient unchanged and sending an alarm of primary frequency modulation function abnormality;

if A < -lambda₁And the integral proportion of the latest set primary frequency modulation adjustment obtained in the step S2330 is more than or equal to 0, and the parameter of the current water head proportionality coefficient is the maximum value in the water head proportionality parameters set in the step S2410, and then an alarm of abnormal primary frequency modulation function is sent;

if A > λ₁And if the parameter of the current water head proportion coefficient is the minimum value in the set water head proportion parameters of the S2410, sending out an alarm of abnormal primary frequency modulation function.

In summary, the primary frequency modulation transfer adjusting method based on the active power adjusting dead zone provided by the invention considers that the monitoring system is the only adjusting mechanism for primary frequency modulation, so that the influence of the power grid frequency deviation in the monitoring system is enhanced as much as possible to ensure the effective action of primary frequency modulation adjustment.

The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.

Claims

1. A primary frequency modulation transfer adjusting method based on an active power adjusting dead zone is characterized in that a monitoring system performs transfer type adjustment on primary frequency modulation and secondary frequency modulation of a hydroelectric generating set, and the method comprises the following operations:

S1600) the lower computer of the monitoring system corrects the unit active power regulation dead zone and carries out active power closed-loop regulation based on the corrected unit active power regulation dead zone; then, carrying out reverse locking on the open-loop feedforward regulation, correcting the opening pulse length of the opening relay of the increasing/decreasing guide vane opening, and then sending an increasing guide vane opening pulse or a decreasing guide vane opening pulse to the speed regulator system;

2. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 1, wherein the calculation of the target primary frequency modulation power regulation quantity by the lower computer of the monitoring system comprises the following operations:

s1210) calculating the deviation delta f for calculating the primary frequency modulation of the power grid frequency and the rated frequency, wherein the deviation delta f comprises the following steps:

s1211) when the absolute value of the difference between the grid frequency and the rated frequency is less than or equal to the hydroelectric primary frequency modulation threshold value, Δ f is equal to 0;

s1212) when the power grid frequency is greater than the rated frequency and the absolute value of the difference between the power grid frequency and the rated frequency is greater than the hydropower primary frequency modulation threshold value, the delta f is equal to the sum of the power grid frequency and the hydropower primary frequency modulation threshold value subtracted from the rated frequency;

s1213) when the power grid frequency is less than the rated frequency and the absolute value of the difference between the power grid frequency and the rated frequency is greater than the hydropower primary frequency modulation threshold value, subtracting the power grid frequency from the rated frequency by the Δ f and then subtracting the hydropower primary frequency modulation threshold value from the Δ f;

s1220) when the primary frequency modulation function is not put into use, adjusting the primary frequency modulation target power by a quantity p_fIs 0;

s1230) when the primary frequency modulation is put into, the primary frequency modulation target power adjustment quantity p_fThe unit rated capacity x the primary frequency modulation power regulation factor x Δ f, wherein the primary frequency modulation regulation factor is predetermined by the scheduling means.

3. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 1, wherein the calculation of the unit active power superposition value variable Δ p comprises the following operations:

s1310) setting a unit active power superposition value variable Δ p, where Δ p ═ p when the primary frequency modulation target adjustment amount correction optional strategy is set to be invalid_f(ii) a When the optional strategy for correcting the primary frequency modulation target adjustment amount is set to be effective, calculating Δ p according to the following steps S1320 to S1340;

s1320) setting a proportionality coefficient k for correcting the primary adjustment target amount₆、k₇,k₆>1,k₇≥1；

S1330) adjusting the target adjustment quantity p when primary frequency modulation is performed_fWhen equal to 0, the unit has active workThe rate superposition value variable Δ p is assigned to be 0, and Δ p is 0;

s1340) adjusting the target adjustment quantity p when primary frequency modulation is carried out_fWhen not equal to 0, the following setting is carried out on the unit active power superposition value variable delta p:

s1341) if the real unit active power output value p is outside the unit active power regulation dead zone range of the set unit active power set value, that is, p is more than p_s+p_dOr p < p_s－p_d，p_dAdjusting the dead zone for the active power of the unit, and adjusting the primary frequency modulation target adjustment quantity p_fIs assigned to Δ p, Δ p ═ p_f；

S1342) if the real unit active power output value p is in the set unit active power regulation dead zone p of the set unit active power set value_dIn the range, i.e. p_s－p_d≤p≤p_s+p_dAnd the primary frequency modulation target adjustment amount p_fIf > 0, Δ p ═ max [ (p + p)_d－p_s)×k₆，p_f×k₇]；

S1343) if p_s－p_d≤p≤p_s+p_dAnd the primary frequency modulation target adjustment amount p_fIf < 0, Δ p ═ min [ (p-p)_d－p_s)×k₆，p_f×k₇]。

4. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 1, wherein the open-loop feed-forward regulation of the primary frequency modulation by the lower computer of the monitoring system for auxiliary regulation comprises the following operations:

S1420) setting a water head proportionality coefficient k_w：

S1421) according to the current head value w to k_wCarry out the calculation of k_w＝(w_bs÷w)^(3/2)；

S1422) dividing the possible fluctuation range of the water head into a plurality of intervals, and setting 1 proportion coefficient parameter for each intervalNumber, set scaling factor parameter at (w)_bs÷w_dw)^(3/2)、(w_bs÷w_up)^(3/2)In which w_upThe upper limit of the water head, w, of the interval_dwThe lower limit of the water head of the interval; when the actual water head w is in a certain interval, the water head proportionality coefficient k is adjusted_wSetting the proportional coefficient parameter corresponding to the interval;

s1423) adjusting the quality and the proportional coefficient k of the water head by the upper computer of the monitoring system according to the primary frequency modulation_wSetting is carried out;

s1440) target adjustment quantity p of primary frequency modulation_fWhen the frequency is more than 0, calculating the increased active power open loop feedforward adjustment pulse length t for carrying out auxiliary adjustment on the primary frequency modulation_u：

S1442) if Δ p' < Δ p, t_u＝t_bs×(Δp－Δp’)÷p_bs×k_w；

s1445) at timer T₁During the countdown, T is counted in each cycle₁Is assigned to t_uAnd when the timer T is started₁When the countdown reaches 0, set s_uIs 0;

s1450) adjusting the primary frequency modulation target adjustment amount p_fWhen the frequency is less than 0, calculating the length t of the active power reducing open loop feedforward regulation pulse for carrying out auxiliary regulation on the primary frequency modulation_d：

S1451) for variable delta p' of active power superposition value of last period unit and active power superposition value of present period unitThe variable Δ p is compared, and if Δ p' ≦ Δ p, t_d＝0；

S1452) if Δ p' > Δ p, t_d＝t_bs×(Δp’－Δp)÷p_bs×k_w；

s1455) at timer T₂During the countdown, T is counted in each cycle₂Is assigned to t_dAnd when the timer T is started₂When the countdown reaches 0, set s_dIs 0;

5. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 1, wherein the modification of the unit active power regulation dead zone by the lower computer of the monitoring system comprises the following operations:

s1610), when the strategy for correcting the unit active power regulation dead zone is set to be invalid, the unit active power regulation dead zone is kept unchanged; when the strategy for correcting the primary frequency modulation target regulating quantity is set to be effective, the unit active power regulation dead zone p is adjusted according to the following steps S1620 to S1640_dThe following calculations were performed:

s1620) setting a proportionality coefficient k for correcting the unit active power regulation dead zone₈，k₈＜1；

s1640) adjusting the primary frequency modulation target adjustment quantity p_fWhen not equal to 0, reducing the active power regulation dead zone p of the unit_d，p_d＝p_d×k₈；

S1700) in an opening adjusting mode of the active power speed regulator of the hydropower station, the lower computer of the monitoring system participates in the closed-loop feedback adjustment of the active power of the following units:

s1710) when the unit active power target value p_tIs greater than the active power real emission value p of the unit, and the absolute value of the difference value between the two is greater than the active power regulation dead zone p of the unit_dIn the time, the lower computer of the monitoring system calculates the opening pulse length t of the opening relay of the guide vane increasing opening degree through the preset active power closed loop regulation function_upMeanwhile, the opening pulse length t of the relay for reducing the opening degree of the guide vane_dwIs set to 0, where p_dAdjusting dead zone p by using corrected active power of unit_d；

S1720) when the unit active power target value p_tIs less than the real power value p of the unit and the absolute value of the difference between the two is greater than the active power regulation dead zone p of the unit_dIn the time, the lower computer of the monitoring system calculates the opening pulse length t of the guide vane opening reducing relay through a preset active power closed loop regulating function_dwMeanwhile, the opening pulse length t of the opening relay of the guide vane is increased_upSet to 0;

based on the results of the calculations of S1710 and S1720, the open loop feed forward adjustment is reverse latched as follows:

s1732) opening pulse length t of relay if reducing guide vane opening_dwIf the value is more than 0, the active feedforward regulation mark s is increased or decreased_uSet to 0, otherwise hold s_uThe change is not changed;

s1740) opening pulse length t of opening blade opening degree relay_upAnd (5) correcting:

s1742) if the active feed-forward regulation mark S is added_u＝1And increasing the opening degree of the guide vane to open the pulse length t_upLess than increased active open loop feedforward adjustment pulse length t_uAssigning the increased active open-loop feedforward regulation pulse length to the increased guide vane opening degree relay to obtain the pulse length, namely t_up＝t_u；

S1743) sending out and t) according to the opening pulse length of the opening relay of the guide vane increasing opening degree_upEqual length of the firing pulse to the governor system;

s1750) opening pulse length t of reducing guide vane opening relay_dwAnd (5) correcting:

6. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 1, wherein the upper computer of the monitoring system further performs the following self-diagnosis on the primary frequency modulation regulation quality:

s2200) setting an auxiliary parameter z for calculating the primary FM quality₁、z₂、z₃、z₄：

S2210)k₃＞z₁＞z₂＞z₃＞z₄＞k₄Wherein k is₃For primary frequency modulation of unitUpper threshold coefficient of rate adjustment, k₄A lower limit threshold coefficient of a unit primary frequency modulation power regulating quantity is obtained;

S2220)z₁+z₄＝2，z₂+z₃＝2；

s2345) when the integral ratio of the unit primary frequency modulation adjustment is k₃And z₁In the meantime, the unit is considered to be in primary frequency modulationAdjusting the quality to be extremely high, and adjusting a quality parameter E to be beta;

7. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 6, wherein the calculation of the theoretical integral quantity and the actual integral quantity of the primary frequency modulation regulation comprises:

s2110) setting primary frequency modulation function input identification bits S of each unit_e：

s2113) when the primary frequency modulation function of the unit is in the input state, if the primary frequency modulation function of the unit is monitoredThe absolute value of the difference between the power grid frequency and the rated frequency is less than or equal to the hydropower primary frequency modulation threshold value, and the unit primary frequency modulation function is put into the identification position s_eIs set to 1;

s2120) when the absolute value of the difference between the grid frequency and the rated frequency exceeds the hydroelectric primary frequency modulation threshold value, if the real power value of the unit is within the regulation dead zone range of the set value of the active power of the unit, the following operations are carried out:

s2124) starting timer T₃；

s2127) setting an identification position S of the change of the set value of the active power of the unit_c，s_cIs 1;

s2130) in each period of the calculation process of the theoretical integral quantity and the actual integral quantity of the primary frequency modulation adjustment of each unit, the method comprises the following operations:

s2131) calculating primary frequency modulation target power regulating quantity p of each unit respectively_fSpaced from the cycle by a time t_fObtaining the theoretical integral quantity of the cycle of the primary frequency modulation adjustment of each unit in the cycle;

s2132) respectively carrying out real sending on the active power real sending value p of each unit in the current period_sSubtracting the actual integral quantity calculation reference value, and calculating the interval time t between the calculation and the period_fThe product of the two frequencies is obtained to obtain the primary frequency modulation frequency of each unit in the periodThe period actual integral quantity of the nodes;

s2133) comparing the absolute value of the difference between the power grid frequency and the rated frequency with the primary frequency modulation frequency deviation evaluation threshold value, and if the absolute value is larger than or equal to the primary frequency modulation frequency deviation evaluation threshold value, identifying the position S_gSet to 1, otherwise remain unchanged;

s2134) comparing timer T₃Evaluating the threshold value with the primary frequency modulation action time, and when the former is greater than or equal to the latter, marking the position s_tSet to 1, otherwise remain unchanged;

s2135) monitoring the active power set value of each unit, comparing the active power set value with a reference value for judging whether the active power set value of each unit changes, and identifying the unit with the changed active power set value by using an identification bit S_cSet to 0, otherwise remain unchanged;

s2140) when the absolute value of the difference between the power grid frequency and the rated frequency is changed from being larger than the hydropower primary frequency modulation threshold value to being smaller than or equal to the hydropower primary frequency modulation threshold value, performing the following operations:

8. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 6, wherein the proportional system of the upper computer to the water head is monitoredNumber k_wPerforming a setup or a handover, comprising the operations of:

s2410) setting a plurality of water head proportion parameters to be selected;

s2420) setting a parameter v, wherein v is greater than 0 and is an integer;

s2430) respectively constructing historical data arrays [ A ] for storing primary frequency modulation adjustment quality parameters for each unit₁、A₂、A₃、…、A_v]；

S2440) after the adjusting quality parameter E of the primary frequency modulation of the unit is obtained through calculation each time, assigning each variable of the historical data array to an array variable with the sequence added by 1, namely A_v＝A_v-1，A_v-1＝A_v-2，…，A₃＝A₂，A₂＝A₁And A is₁Assigned to the tuning quality parameter E, i.e. A₁＝E；

S2460) accumulating variables of the historical data array, wherein A is A₁+A₂+A₃+…+A_vAnd the accumulated result A and the ideal threshold value lambda of the primary frequency modulation are compared₁Performing a comparison comprising:

s2463) if A < lambda >₁And if the integral proportion of the latest set primary frequency modulation adjustment obtained in the step S2330 is greater than or equal to 0, all the parameters which are greater than the current water head proportionality coefficient in the water head proportionality parameters set in the step S2410 are listed, the minimum one is selected from the parameters, and the minimum one is set or switched to the water head proportionality coefficient k_wMeanwhile, clearing 0 for each variable of the historical data array;

s2464) if A > λ₁Then, all the parameters smaller than the current head proportionality coefficient in the head proportionality parameters set in S2410 are listed, and the largest one is selected from them,set or switch it to a head proportionality coefficient k_wMeanwhile, each variable of the historical data array is cleared to 0.

9. The primary frequency modulation transfer regulation method based on the active power regulation dead zone as claimed in claim 6 or 8, wherein the primary frequency modulation function abnormality alarm is issued under the following conditions: