CN113809736A - Automatic power generation control method based on adaptive proportional-derivative control - Google Patents

Automatic power generation control method based on adaptive proportional-derivative control Download PDF

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Publication number
CN113809736A
CN113809736A CN202010527273.7A CN202010527273A CN113809736A CN 113809736 A CN113809736 A CN 113809736A CN 202010527273 A CN202010527273 A CN 202010527273A CN 113809736 A CN113809736 A CN 113809736A
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control
gain
power generation
differential
proportional
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Inventor
王民昆
谈超
罗卫华
兰强
滕贤亮
卿泉
丁恰
刘成江
涂孟夫
何笠
张小白
郑澍
庞涛
汪燕
刘爱梅
杨鹏
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State Grid Corp of China SGCC
NARI Nanjing Control System Co Ltd
Southwest Branch of State Grid Corp
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State Grid Corp of China SGCC
NARI Nanjing Control System Co Ltd
Southwest Branch of State Grid Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention relates to an automatic power generation control method based on self-adaptive proportional-derivative control, which comprises the following steps: acquiring power grid operation data, and calculating the amount of active power unbalance in the control area; and calculating the adjustment demand of the control area according to the fluctuation range and the variation trend of the ACE of the control area by matching the proportional gain and the differential gain in real time. By adopting the method, the problem that the current automatic power generation control system cannot flexibly adapt to the change of the power grid operation condition can be effectively solved by the dynamic change of the proportional gain and the differential gain under the condition that the power grid operation condition is constantly changed, and the active power control quality of the power grid is improved.

Description

Automatic power generation control method based on adaptive proportional-derivative control
Technical Field
The invention relates to an automatic power generation control method based on self-adaptive proportional-differential control, and belongs to the technical field of automatic power generation control of power systems.
Background
An Automatic Generation Control (AGC) system is an important means for maintaining the active power balance of a power grid, and with the continuous construction of an extra-high voltage power grid, the scale of the power grid is continuously enlarged, the operating environment is gradually complex, and the safe operating risk is increasingly increased. In order to improve the dynamic Control performance of the AGC and deal with the delay effect in the AGC, the existing research focuses on improving the load prediction precision, and the requirements that a thermal power generating unit mainly adopts a mode of tracking a power generation plan curve to realize advanced Control, and a hydroelectric power generating unit participates in Control Error (ACE) Control in a daily Area are met; or a model prediction control algorithm is adopted, and an effective prediction model is established to predict the change trend of the future power grid active power unbalance amount so as to realize advanced control.
In conclusion, because the load prediction accuracy is improved to a limited extent, the load prediction is limited by the system calculation period, the real-time requirement on various data is high, and the model prediction control algorithm has the problem of calculation non-convergence, so that the engineering practicability is difficult. In consideration of a proportional-integral mode in the existing automatic power generation control, because integral saturation exists in integral components, phase margin and system damping ratio are reduced, and the active power control quality of a power grid is deteriorated. Therefore, it is necessary to provide an automatic power generation control algorithm which can automatically adapt to the change of the grid operation condition and has a certain prediction effect.
Disclosure of Invention
In order to achieve the purpose, the invention provides an automatic power generation control method based on adaptive proportional-differential control, which matches proportional gain and differential gain in real time according to the fluctuation range and the variation trend of ACE (adaptive control area) in a control area and calculates the adjustment demand of the control area.
The technical scheme adopted by the invention is as follows:
an automatic power generation control method based on adaptive proportional-derivative control comprises the following steps:
establishing a regional control deviation calculation model of a power grid control area;
matching proportional gain and differential gain based on regional control deviation of a power grid control region, and applying the matching proportional gain and the differential gain to an automatic power generation control system of a provincial power grid control region;
and calculating the power generation regulation demand of the power grid control area according to the control deviation, the proportional gain and the differential gain of the power grid control area.
Further, the establishing of the power grid control area regional control deviation calculation model includes:
ACE(t)＝-10B[fa(t)-fs]+[Pa(t)-Ps(t)]；
wherein ACE (t) is the regional control deviation of the power grid control area at the time t, B is the frequency deviation coefficient of the power grid control area, fa(t) is the actual frequency of the grid at time t, fsPlanning frequency, P, for the grida(t) is the sum of the actual power flow of the power grid control area to the external connecting line at the moment t, PsAnd (t) the power grid control area external tie line general plan at the time t.
Further, the matching of the proportional gain based on the regional control deviation of the power grid control region includes:
Figure BDA0002534052980000021
wherein, KPIs a proportional gain, Ld1For the first level of deviation of the zone control, Ld2A second level limit for the zone control deviation.
Further, said Ld1Value of 50, Ld2The value is 200.
Further, the matching of the differential gain based on the grid control area region control deviation includes:
Figure BDA0002534052980000022
wherein, KdFor differential gain, ACE (t-1) is the area control deviation at time t-1, La1Varying a first limit, L, for the zone control deviationa2The second limit is varied for the zone control deviation.
Further, said La1Value of 100, La2Is a value of 400.
Further, the calculating the power generation adjustment demand of the power grid control area according to the control deviation, the proportional gain and the differential gain of the power grid control area includes:
Figure BDA0002534052980000023
wherein, DeltaP (t) is the power generation regulation demand of the power grid control area at the time t, KPTo proportional gain, KdIn order to be a differential gain, the gain is,
Figure BDA0002534052980000024
is the differential component.
Further, the differential component satisfies:
Figure BDA0002534052980000031
Figure BDA0002534052980000032
wherein the content of the first and second substances,
Figure BDA0002534052980000033
the lower limit of the differential limit value is,
Figure BDA0002534052980000034
the upper limit of the differentiation limit value is,
Figure BDA0002534052980000035
is a differential dead zone;
if the differential component is lower than
Figure BDA0002534052980000036
Is set to
Figure BDA0002534052980000037
If the differential component is not less than
Figure BDA0002534052980000038
Is set to
Figure BDA0002534052980000039
If the absolute value of the differential component is not higher than
Figure BDA00025340529800000310
Then 0 is set.
Further, the
Figure BDA00025340529800000311
The setting is-400 a, and,
Figure BDA00025340529800000312
set to 400.
Further, the
Figure BDA00025340529800000313
Set to 35.
The invention achieves the following beneficial effects:
the automatic power generation control method based on the self-adaptive proportional-differential control provided by the invention adaptively adjusts the proportional gain and the differential gain in an AGC system according to the change of the operation condition of a power grid, calculates the adjustment demand of a control area, improves the active power control performance of the power grid, further improves the control stability in a normal operation state according to the proportional-differential control, improves the control efficiency and the adjustment speed after a fault, and relieves the daily operation pressure of a dispatcher, thereby improving the operation efficiency of the power grid and improving the safe and stable operation capability of the power grid.
Drawings
Fig. 1 is a flow chart of an automatic power generation control method based on adaptive proportional-derivative control according to the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, the invention discloses an automatic power generation control method based on adaptive proportional-derivative control, comprising:
step 1: and establishing a calculation model of Area Control Error (ACE) of the power grid control Area, and calculating the amount of active power unbalance of the control Area.
Step 2: and matching the proportional gain and the differential gain in real time according to the change range and the fluctuation trend of the control deviation of the control area.
And step 3: and setting the selected proportional gain and the selected differential gain in an Automatic Generation Control (AGC) system of a provincial power grid control area.
And 4, step 4: and the AGC system of the power grid control area calculates the adjustment demand of the control area according to the area control deviation, the proportional gain and the differential gain.
More specifically, the establishing a calculation model of the regional control deviation of the power grid control region and calculating the amount of the active power imbalance of the control region includes:
an ACE calculation model is established in a tie-line frequency bias control (TBC) mode to reflect the amount of active power unbalance inside a control area:
ACE(t)＝-10B[fa(t)-fs]+[Pa(t)-Ps(t)] (1)
ACE (t) is the regional control deviation of the power grid control area at the moment t, and B is the frequency deviation coefficient of the power grid control area; f. ofa(t) is the actual frequency of the power grid at the moment t; f. ofsPlanning the frequency for the power grid, generally taking 50 Hz; pa(t) adding the actual power flow of the external connecting line in the power grid control area at the moment t; psAnd (t) is a total planned value of the external tie line of the power grid control area at the moment t.
More specifically, the matching of the proportional gain and the differential gain in real time according to the fluctuation range and the variation trend of the control deviation in the control area includes:
selecting proportional gain according to the fluctuation range of the regional control deviation of the control area, and setting two-stage limit values of the regional control deviation, wherein the corresponding proportional gain setting method comprises the following steps:
Figure BDA0002534052980000041
wherein, KPIs a proportional gain, Ld1A first level limit for the zone control deviation; l isd2A second level limit for the zone control deviation.
Furthermore, L is selected in the embodiment of the inventiond1Is 50, Ld2Is 200.
Selecting differential gain according to the variation trend of the control deviation of the control area:
when the regional control deviation value changes rapidly in a single direction, the change of the regional control deviation needs to be tracked as soon as possible, and a larger differential gain needs to be set; when the regional control deviation value oscillates within a certain range, the control stability is kept, and a small differential gain needs to be set.
More specifically, the trend of change of the zone control deviation is represented by the absolute value of the difference value at the adjacent time, the differential gain is set as follows:
Figure BDA0002534052980000051
wherein, KdFor differential gain, ACE (t-1) is the area control deviation at time t-1, La1Varying a first limit for the zone control deviation; l isa2The second limit is varied for the zone control deviation.
Furthermore, L is selected in the embodiment of the inventiona1Is 100, La2Is 400.
More specifically, the AGC system of the grid control area calculates the adjustment demand of the control area according to the area control deviation, the proportional gain and the differential gain, and the calculation is as follows:
Figure BDA0002534052980000052
wherein, the delta P (t) is the regulation demand of the power grid control area at the time t,
Figure BDA0002534052980000053
is divided into differential partsAmount of the compound (A).
As a further improvement, in order to prevent the large unit action amplitude caused by differential jump in the actual control stage, a differential limit value is set:
Figure BDA0002534052980000054
wherein the content of the first and second substances,
Figure BDA0002534052980000055
is the lower limit of the differential limit;
Figure BDA0002534052980000056
is the upper differential limit.
If the differential component is lower than
Figure BDA0002534052980000057
Is set to
Figure BDA0002534052980000058
If the differential component is not less than
Figure BDA0002534052980000059
Is set to
Figure BDA00025340529800000510
Further, the embodiment of the invention selects
Figure BDA00025340529800000511
Is a mixture of-400,
Figure BDA00025340529800000512
is 400.
If the differential component is below-400, set to-400; if the differential component is not less than 400, it is set to 400.
As a further improvement, in order to avoid the jump of the active power control demand caused by the differential action, the differential dead zone is set as follows:
Figure BDA00025340529800000513
wherein the content of the first and second substances,
Figure BDA00025340529800000514
is a differential dead zone.
If the differential component is not higher than
Figure BDA00025340529800000515
Then 0 is set.
Further, the embodiment of the invention selects
Figure BDA00025340529800000516
Is 35.
If the differential component is not higher than 35, 0 is set.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. An automatic power generation control method based on adaptive proportional-derivative control is characterized by comprising the following steps:
establishing a regional control deviation calculation model of a power grid control area;
matching proportional gain and differential gain based on regional control deviation of a power grid control region, and applying the matching proportional gain and the differential gain to an automatic power generation control system of a provincial power grid control region;
and calculating the power generation regulation demand of the power grid control area according to the control deviation, the proportional gain and the differential gain of the power grid control area.
2. The method for controlling automatic power generation based on adaptive proportional-derivative control according to claim 1, wherein the establishing of the grid control area regional control deviation calculation model comprises:
ACE(t)＝-10B[fa(t)-fs]+[Pa(t)-Ps(t)]；
wherein ACE (t) is the regional control deviation of the power grid control area at the time t, B is the frequency deviation coefficient of the power grid control area, fa(t) is the actual frequency of the grid at time t, fsPlanning frequency, P, for the grida(t) is the sum of the actual power flow of the power grid control area to the external connecting line at the moment t, PsAnd (t) the power grid control area external tie line general plan at the time t.
3. The method according to claim 2, wherein the matching of the proportional gain based on the grid control area region control deviation comprises:
Figure FDA0002534052970000011
wherein, KPIs a proportional gain, Ld1For the first level of deviation of the zone control, Ld2A second level limit for the zone control deviation.
4. The automatic power generation control method based on adaptive proportional-derivative control according to claim 3, wherein L isd1Value of 50, Ld2The value is 200.
5. The method of claim 2, wherein the matching of the differential gain based on the grid control area region control deviation comprises:
Figure FDA0002534052970000021
wherein, KdFor differential gain, ACE (t-1) is the area control deviation at time t-1, La1Controlling deviation variance for zonesFirst limit value, La2The second limit is varied for the zone control deviation.
6. The automatic power generation control method based on adaptive proportional-derivative control according to claim 5, wherein L isa1Value of 100, La2Is a value of 400.
7. The automatic power generation control method based on the adaptive proportional-derivative control according to claim 2, wherein the calculating of the power generation regulation demand of the grid control area according to the grid control area control deviation, the proportional gain and the derivative gain comprises:
Figure FDA0002534052970000022
wherein, DeltaP (t) is the power generation regulation demand of the power grid control area at the time t, KPTo proportional gain, KdIn order to be a differential gain, the gain is,
Figure FDA0002534052970000023
is the differential component.
8. The automatic power generation control method based on adaptive proportional-derivative control according to claim 7, wherein the derivative component satisfies:
Figure FDA0002534052970000024
Figure FDA0002534052970000025
wherein the content of the first and second substances,
Figure FDA0002534052970000026
the lower limit of the differential limit value is,
Figure FDA0002534052970000027
the upper limit of the differentiation limit value is,
Figure FDA0002534052970000028
is a differential dead zone;
if the differential component is lower than
Figure FDA0002534052970000029
Is set to
Figure FDA00025340529700000210
If the differential component is not less than
Figure FDA00025340529700000211
Is set to
Figure FDA00025340529700000212
If the absolute value of the differential component is not higher than
Figure FDA00025340529700000213
Then 0 is set.
9. The method according to claim 8, wherein the method comprises a step of controlling the power generation based on the adaptive proportional-derivative control
Figure FDA00025340529700000214
The setting is-400 a, and,
Figure FDA00025340529700000215
set to 400.
10. The method according to claim 8, wherein the method comprises a step of controlling the power generation based on the adaptive proportional-derivative control
Figure FDA0002534052970000031
Set to 35.
CN202010527273.7A 2020-06-11 2020-06-11 Automatic power generation control method based on adaptive proportional-derivative control Pending CN113809736A (en)

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Publication Number Publication Date
CN113809736A true CN113809736A (en) 2021-12-17

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