CN115051370B - Automatic voltage control system voltage limit value optimization method based on double-stage complementation - Google Patents

Automatic voltage control system voltage limit value optimization method based on double-stage complementation Download PDF

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CN115051370B
CN115051370B CN202210713654.3A CN202210713654A CN115051370B CN 115051370 B CN115051370 B CN 115051370B CN 202210713654 A CN202210713654 A CN 202210713654A CN 115051370 B CN115051370 B CN 115051370B
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limit value
voltage
kilovolt
range
bus
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CN115051370A (en
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赵泽昆
王瑶
周海
胡红线
常德锋
赵树法
霍宣敏
刘祥
陈彤
贾玉洁
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State Grid Corp of China SGCC
Xinxiang Power Supply Co of State Grid Henan Electric Power Co Ltd
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State Grid Corp of China SGCC
Xinxiang Power Supply Co of State Grid Henan Electric Power Co Ltd
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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a voltage limit value optimization method of an automatic voltage control system based on double-stage complementation, which is characterized by comprising the following steps of: a: judging whether frequent switching occurs or not; if the step B is performed, the step B is performed; b: c or step D is carried out by acquiring a capacitor switching record and frequent switching reasons; c: circularly adjusting the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus; then observing whether frequent switching still occurs; re-executing step C occurs; if not, entering the step E; d: circularly adjusting the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus; then observing whether frequent switching still occurs; re-executing step D occurs; if not, entering the step E; e: and finishing the voltage limit adjustment and outputting the voltage limit. The invention can quickly and effectively adjust the bus voltage limit value, thereby avoiding the problem of frequent switching of capacitor equipment.

Description

Automatic voltage control system voltage limit value optimization method based on double-stage complementation
Technical Field
The invention relates to a voltage limit value optimization method, in particular to a voltage limit value optimization method of an automatic voltage control system based on double-stage complementation.
Background
With the continuous expansion of the power grid scale, the national grid company puts forward higher requirements on the electric energy quality, the voltage is an important index for measuring the electric energy quality, and the quality of the electric energy quality not only affects the life safety of residents and the service life of electrical equipment, but also has great influence on the economical and safety of the power grid operation. The power output of equipment such as power transformation, transmission and distribution of a power grid is reduced due to the fact that the voltage is too low, the power loss and the energy consumption of the equipment are increased, even voltage breakdown accidents occur, and the safe and stable operation of the power grid is affected; the insulation of the equipment can be affected when the voltage is too high, the service life of the equipment is reduced, the power loss of the motor and the transformer is increased, and meanwhile, the harmonic wave of the power grid is increased, so that the safe and economic operation of the power system is endangered. Therefore, an Automatic Voltage Control (AVC) system is widely adopted at present to effectively regulate the bus voltage of each transformer substation, so that when the bus voltage in the power system exceeds the normal operation range, the bus voltage is regulated to the normal range.
However, the current common bus voltage adjusting scheme is to set the upper and lower limit values of the bus voltage according to experience and subjective judgment, the voltage cannot be adjusted when the set range of the upper and lower limit values of the voltage is larger, the capacitor is easy to frequently switch and back when the set range of the upper and lower limit values of the voltage is smaller, and the reason for frequently switching is mainly that the upper and lower limit values of 10 kilovolt and 35 kilovolt buses cannot be simultaneously met, so that the service life of equipment is seriously influenced.
Disclosure of Invention
The invention aims to provide a voltage limit value optimization method of an automatic voltage control system based on double-stage complementation, which can comprehensively consider the upper and lower limit values of 10 kilovolt and 35 kilovolt bus voltage of the same station, and adopts a method of hierarchical optimization and double-stage complementation to quickly and effectively adjust the bus voltage limit value, thereby avoiding the frequent switching problem of capacitor equipment under the control of AVC and improving the electric energy quality.
The invention adopts the following technical scheme:
a voltage limit value optimization method of an automatic voltage control system based on double-stage complementation comprises the following steps:
a: judging whether the station capacitor has frequent switching phenomenon or not; if so, entering the step B; if not, judging whether the station capacitor frequently drops or drops again after setting time interval;
b: acquiring a capacitor switching record, and judging the frequent switching reason of the capacitor according to the capacitor switching record;
if the capacitor switching record comprises the conditions of low voltage of 10 kilovolt bus, high voltage of capacitor switching, high voltage of 35 kilovolt bus, capacitor switching-out and low voltage of 10 kilovolt bus, the reason for frequent switching of the capacitor is judged to be that the voltage of 10 kilovolt bus is low, and the step C is entered;
If the capacitor switching record comprises the conditions of high voltage of 10 kilovolt bus, withdrawal of the capacitor, low voltage of 35 kilovolt bus, input of the capacitor and high voltage of 10 kilovolt bus, judging that the reason for frequent switching of the capacitor is that the voltage of the 10 kilovolt bus is high, and entering the step D;
c: adopting a two-stage complementary mode to circularly adjust the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step C; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
d: adopting a two-stage complementary mode to circularly adjust the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step D; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
e: and (5) finishing voltage limit adjustment, and outputting voltage limits of the 10 kilovolt bus and the 35 kilovolt bus.
In the step a, if the number of times of switching the station capacitor is higher than the set switching threshold value within the continuous T minutes, it is determined that the switching is frequently performed.
The switching threshold is T' times.
In the step C, the method for circularly adjusting is as follows:
firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
adjusting the upper voltage limit value of the 35 kilovolt bus; the initial upper limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial upper limit value of the voltage of the 35 kilovolt bus is increased;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit for one time;
the primary judgment process of whether the bus voltage exceeds the limit is as follows: if the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, and optimizing the capacitor capacity and the group number to determine the optimal compensation capacity and distribution mode;
If the frequent switching phenomenon still exists, judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
the primary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the upper limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
the judging process of whether the upper limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the upper voltage limit value of the 35 kilovolt bus;
the secondary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, and optimizing the capacity and the number of groups of the capacitor to determine the optimal compensation capacity and the distribution mode; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
the lower limit value adjusting method of the 10 kilovolt bus voltage comprises the following steps: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the lower limit value of the 10 kilovolt bus voltage is reduced;
If the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit; if the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not.
In the step D, the cyclic adjustment method is as follows:
firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus; the initial lower limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice;
the process of secondary judgment of whether the bus voltage exceeds the limit is as follows: if the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, and optimizing the capacitor capacity and the group number to determine the optimal compensation capacity and distribution mode;
If the frequent switching phenomenon still exists, judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
the primary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
the judging process of whether the lower limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the lower voltage limit value of the 35 kilovolt bus;
the secondary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, and optimizing the capacity and the number of groups of the capacitor to determine the optimal compensation capacity and the distribution mode; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
the method for adjusting the upper limit value of the 10 kilovolt bus voltage comprises the following steps: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the upper limit value of the 10 kilovolt bus voltage is increased;
If the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice; if the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not.
In the steps C and D, the adjustment step delta is respectively set for the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus L and δH Setting the adjustment amplitude of each time of the voltage limit value of the 10 kilovolt bus to be n1 delta by setting the first intermediate variable n1 and the second intermediate variable n2 L The voltage limit value of the 35 KV bus is regulated to be n2 x delta each time H 。
The step C comprises the following steps:
c1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit [ U ] H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step C2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
c2: updating the upper voltage limit value of the 35 kilovolt bus, wherein the updating formula of the upper voltage limit value of the 35 kilovolt bus is U * H2 ＝U H2 +n2*δ H The method comprises the steps of carrying out a first treatment on the surface of the Then enter step C3;
wherein ,U* H2 For the updated upper limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
and C3: after the upper limit value of the 35 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10; if frequent switching still occurs, entering a step C4;
and C4: carrying out primary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, the step C7 is carried out; if the range is not exceeded, the step C5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
c5: updating the lower limit value of the 10 kilovolt bus voltage, wherein the updating formula of the lower limit value of the 10 kilovolt bus voltage is U L * 1 ＝U L1 -n1*δ L The method comprises the steps of carrying out a first treatment on the surface of the Then enter step C6;
wherein ,UL * 1 For the updated lower limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
c6: after the lower limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10; if frequent switching still occurs, entering a step C7;
C7: judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range M or not;
if the range is out, the step C8 is carried out; if the current value of n2 is not beyond the range, updating n2, adding 1 on the basis of the current value of n2, and then entering a step C2;
m is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
and C8: performing secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds a range N or not;
if the range is out, the step C9 is carried out;
if the current value of n1 is not beyond the range, updating n1, adding 1 on the basis of the current value of n1, and then entering a step C5;
c9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode by optimizing the capacity and the number of groups of the capacitors when the plant has no proper voltage limit value under the specification of the capacitor;
c10: judging whether the bus voltage exceeds the limit once, and judging whether the optimized lower limit value of the 10 kilovolt bus voltage exceeds the range N and whether the upper limit value of the 35 kilovolt bus voltage exceeds the range M;
If any one exceeds the range, entering a step C9; if both are not out of range, enter step C11;
c11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step C12;
and C12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step C1; if not, the step E is entered.
The step D comprises the following steps:
d1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit valueU H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step D2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
d2: updating the lower voltage limit value of the 35 kilovolt bus, wherein the updating formula of the lower voltage limit value of the 35 kilovolt bus is U * H1 ＝U H1 -n2*δ H The method comprises the steps of carrying out a first treatment on the surface of the Then enter step D3;
wherein ,U* H1 For the updated lower limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
D3: after the voltage lower limit value of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, the step D10 is carried out; if frequent switching still occurs, the step D4 is entered;
d4: carrying out primary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D7 is carried out; if the range is not exceeded, the step D5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
d5: updating the upper limit value of the 10 kilovolt bus voltage, wherein the updating formula of the upper limit value of the 10 kilovolt bus voltage is U L * 2 ＝U L2 +n1*δ L The method comprises the steps of carrying out a first treatment on the surface of the Then enter step D6;
wherein ,UL * 2 For the updated upper limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
d6: after the upper limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, the step D10 is carried out; if frequent switching still occurs, a step D7 is entered;
d7: judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range M or not;
If the range is out, the step D8 is carried out; if the current value of n2 is not beyond the range, updating n2, adding 1 on the basis of the current value of n2, and then entering a step D2;
m is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
d8: performing secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D9 is carried out; if the current value of n1 is not beyond the range, updating n1, adding 1 on the basis of the current value of n1, and then entering a step D5;
d9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode by optimizing the capacity and the number of groups of the capacitors when the plant has no proper voltage limit value under the specification of the capacitor;
d10: judging whether the bus voltage exceeds the limit twice, and judging whether the optimized upper limit value of the 10 kilovolt bus voltage exceeds the range N and whether the optimized lower limit value of the 35 kilovolt bus voltage exceeds the range M;
if any one exceeds the range, the step D9 is entered; if both are not out of range, enter step D11;
d11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step D12;
D12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step D1; if not, the step E is entered.
The step length delta is adjusted L and δH All 0.1 was used.
The time of the observation period is not less than 24 hours.
According to the invention, through analyzing the record of frequent switching of the capacitor in the existing D5000 system, the reasons of frequent switching of the capacitor are divided into two cases of low voltage of the 10 kilovolt bus and high voltage of the 10 kilovolt bus according to the trigger condition of frequent switching of the capacitor, and the voltage limit values in the two cases are circularly regulated according to the set regulating amplitude, so that the current situation that the personal experience of operation and maintenance personnel is the main and the limit value regulating process is relatively blind in the existing bus voltage limit value regulating scheme is changed, the bus voltage limit value regulation can be efficiently and accurately completed, the frequent switching problem of capacitor equipment under AVC control is solved, and the electric energy quality is improved.
The invention also respectively sets the adjustment step delta for the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus L and δH Setting a first intermediate variable n1 and a second intermediate variable n2 so that the adjustment amplitude of the voltage limit value of the 10 kilovolt bus is n1 x delta each time L The voltage limit value of the 35 KV bus is regulated to be n2 x delta each time H The voltage limit value of the 10 kilovolt bus and the 35 kilovolt bus can be adjusted in a grading mode, the refinement and quantification of the voltage limit value adjusting process are achieved, and finally the purposes of limiting value optimization under a variable scale are achieved by changing the adjusting step length, controlling the single limit value adjusting scale and further changing the fineness of the whole limit value adjusting process.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic flow chart of step C in the present invention;
fig. 3 is a schematic flow chart of step D in the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawings and examples:
as shown in fig. 1 to 3, the method for optimizing the voltage limit value of the automatic voltage control system based on the two-stage complementation comprises the following steps:
a: judging whether the station capacitor has frequent switching phenomenon or not; if so, entering the step B; if not, judging whether the station capacitor frequently drops or drops again after setting time interval;
in the invention, if the number of times of switching of the station capacitor is higher than a set switching threshold value in continuous T minutes, the station capacitor is judged to be frequently switched; the switching threshold can be adjusted according to the actual field, and the switching threshold is set to be T' times, namely, the capacitor can only perform switching action or switching action once every minute at most.
B: acquiring a capacitor switching record, and judging the frequent switching reason of the capacitor according to the capacitor switching record;
if the capacitor switching record comprises the conditions of low voltage of 10 kilovolt bus, high voltage of capacitor switching, high voltage of 35 kilovolt bus, capacitor switching-out and low voltage of 10 kilovolt bus, the reason for frequent switching of the capacitor is judged to be that the voltage of 10 kilovolt bus is low, and the step C is entered;
if the capacitor switching record comprises the conditions of high voltage of 10 kilovolt bus, withdrawal of the capacitor, low voltage of 35 kilovolt bus, input of the capacitor and high voltage of 10 kilovolt bus, judging that the reason for frequent switching of the capacitor is that the voltage of the 10 kilovolt bus is high, and entering the step D;
at present, the existing busbar voltage limit value adjustment scheme mainly uses personal experience of operation and maintenance personnel, a temporary and non-mature limit value adjustment scheme is used for reference of the operation and maintenance personnel, and the limit value adjustment process is blind, so that the capacitor can not be processed in time due to frequent switching, and the safe operation of a power grid is seriously affected.
In order to normalize and standardize the upper and lower limit value adjustment scheme of the bus voltage, so that operation and maintenance personnel can conduct targeted optimization of the upper and lower limit values of the bus voltage, and the problem of frequent switching of the capacitor is solved. The voltage limit setting principle of the traditional bus under the AVC control adopts a general configuration principle, namely the voltage limit is only related to voltage levels (such as 10kV and 35 kV) or time period types (such as 00:00:00 to 11:59:59;12:00:00 to 23:59:59), although the method is simpler, the traditional bus voltage limit setting method is unfavorable for the dispatching terminal to optimize the AVC control strategy, the accurate control of the power grid voltage is realized, the defects that the capacitor frequently drops and the service life of the capacitor equipment is seriously influenced are overcome in the traditional bus voltage limit setting under the AVC control, the purpose of effectively regulating voltage by the AVC is ensured by utilizing an optimal control strategy, and the accurate setting of the bus voltage limit is carried out according to the local conditions. Therefore, the method and the device respectively analyze the two conditions of low voltage of the 10 kilovolt bus and high voltage of the 10 kilovolt bus after classification, and further define a problem solving thought and a voltage limit value adjusting method so as to solve the problem of frequent switching more efficiently, more quickly and more accurately.
The D5000 system is fully called as a smart grid dispatching control system, the system is fully popularized and used, AVC is an advanced application module in the system, the AVC module can record each time of switching action of a capacitor, and meanwhile, information such as the reason, time and success or failure of switching of the capacitor is recorded.
C: adopting a two-stage complementary mode to circularly adjust the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step C; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
the method for cyclic adjustment is as follows:
firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
adjusting the upper voltage limit value of the 35 kilovolt bus;
the initial upper limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial upper limit value of the voltage of the 35 kilovolt bus is increased;
If the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit for one time;
the primary judgment process of whether the bus voltage exceeds the limit is as follows: if the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, optimizing the capacity and the number of groups of the capacitors, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered partition compensation and on-site balance;
if the frequent switching phenomenon still exists, judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
the primary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the upper limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
the judging process of whether the upper limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the upper voltage limit value of the 35 kilovolt bus;
The secondary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, optimizing the capacity and the number of groups of the capacitors, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and on-site balance; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
the lower limit value adjusting method of the 10 kilovolt bus voltage comprises the following steps: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the lower limit value of the 10 kilovolt bus voltage is reduced;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit;
if the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not;
d: adopting a two-stage complementary mode to circularly adjust the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step D; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
The method for cyclic adjustment is as follows:
firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus;
the initial lower limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice;
the process of secondary judgment of whether the bus voltage exceeds the limit is as follows: if the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, optimizing the capacity and the number of groups of the capacitors, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered partition compensation and on-site balance;
if the frequent switching phenomenon still exists, judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
The primary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
the judging process of whether the lower limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the lower voltage limit value of the 35 kilovolt bus;
the secondary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, optimizing the capacity and the number of groups of the capacitors, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and on-site balance; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
the method for adjusting the upper limit value of the 10 kilovolt bus voltage comprises the following steps: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the upper limit value of the 10 kilovolt bus voltage is increased;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice;
If the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not;
e: and (5) finishing voltage limit adjustment, and outputting voltage limits of the 10 kilovolt bus and the 35 kilovolt bus.
In this embodiment, in order to ensure the stability of the 10 kv bus and the 35 kv bus after the optimization of the voltage limit, and to determine the rationality of the optimization limit, the observation period is set to be not less than 24 hours.
In order to be able to carry out hierarchical adjustment on the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus, in the embodiment, a first intermediate variable n1 and a second intermediate variable n2 are set independently of each other, and the first intermediate variable n1 and the second intermediate variable n2 are used for determining the adjustment amplitude of the voltage limit values; meanwhile, in order to realize the refinement and quantification of the voltage limit value adjustment process, the invention also sets the adjustment step delta for the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus respectively L and δH The method comprises the steps of carrying out a first treatment on the surface of the Finally, the adjustment amplitude of each time of the voltage limit value of the 10 kilovolt bus is determined to be n1 delta L The voltage limit value of the 35 KV bus is regulated to be n2 x delta each time H Therefore, the single limit value adjustment scale can be controlled by changing the adjustment step length, the fineness of the whole limit value adjustment process is further changed, and limit value optimization under a variable scale is realized. In the present embodiment, the step size δ is adjusted L and δH All 0.1 can be used.
The first intermediate variable n1 and the second intermediate variable n2 are combined and the step size delta is adjusted L and δH Further refining the step C and the step D in the invention;
the step C comprises the following specific steps:
c1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit [ U ] H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step C2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
c2: updating the upper voltage limit value of the 35 kilovolt bus, wherein the updating formula of the upper voltage limit value of the 35 kilovolt bus is U * H2 ＝U H2 +n2*δ H The method comprises the steps of carrying out a first treatment on the surface of the Then enter step C3;
wherein ,U* H2 For the updated upper limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
and C3: after the upper limit value of the 35 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10;
if frequent switching still occurs, entering a step C4;
And C4: carrying out primary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, the step C7 is carried out;
if the range is not exceeded, the step C5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
c5: updating the lower limit value of the 10 kilovolt bus voltage, wherein the updating formula of the lower limit value of the 10 kilovolt bus voltage is U L * 1 ＝U L1 -n1*δ L The method comprises the steps of carrying out a first treatment on the surface of the Then enter step C6;
wherein ,UL * 1 For the updated lower limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
c6: after the lower limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10;
if frequent switching still occurs, entering a step C7;
c7: judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range M or not;
if the range is out, the step C8 is carried out;
if the current value of n2 is not beyond the range, updating n2, enabling n2=n2+1, namely adding 1 on the basis of the current value of n2, and then entering a step C2;
M is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
and C8: performing secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds a range N or not;
if the range is out, the step C9 is carried out;
if the current value of n1 is not beyond the range, updating n1, enabling n1=n1+1, namely adding 1 on the basis of the current value of n1, and then entering a step C5;
c9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and on-site balance, wherein the factory station has no proper voltage limit value and the capacity and the number of groups of the capacitors are required to be optimized under the specification of the capacitor;
c10: judging whether the bus voltage exceeds the limit once, and judging whether the optimized lower limit value of the 10 kilovolt bus voltage exceeds the range N and whether the upper limit value of the 35 kilovolt bus voltage exceeds the range M;
if any one exceeds the range, entering a step C9;
if both are not out of range, enter step C11;
c11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step C12;
And C12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step C1; if not, entering the step E;
the step D comprises the following specific steps:
d1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit [ U ] H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step D2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
d2: updating the lower voltage limit value of the 35 kilovolt bus, wherein the updating formula of the lower voltage limit value of the 35 kilovolt bus is U * H1 ＝U H1 -n2*δ H The method comprises the steps of carrying out a first treatment on the surface of the Then enter step D3;
wherein ,U*H1 For the updated lower limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
d3: after the voltage lower limit value of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, the step D10 is carried out;
if frequent switching still occurs, the step D4 is entered;
D4: carrying out primary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D7 is carried out;
if the range is not exceeded, the step D5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
d5: updating the upper limit value of the 10 kilovolt bus voltage, wherein the updating formula of the upper limit value of the 10 kilovolt bus voltage is U L * 2 ＝U L2 +n1*δ L The method comprises the steps of carrying out a first treatment on the surface of the Then enter step D6;
wherein ,UL * 2 For the updated upper limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
d6: after the upper limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, the step D10 is carried out;
if frequent switching still occurs, a step D7 is entered;
d7: judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range M or not;
if the range is out, the step D8 is carried out;
if the current value of n2 is not beyond the range, updating n2, enabling n2=n2+1, namely adding 1 on the basis of the current value of n2, and then entering a step D2;
M is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
d8: performing secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D9 is carried out;
if the current value of n1 is not beyond the range, updating n1, enabling n1=n1+1, namely adding 1 on the basis of the current value of n1, and then entering a step D5;
d9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and on-site balance, wherein the factory station has no proper voltage limit value and the capacity and the number of groups of the capacitors are required to be optimized under the specification of the capacitor;
d10: judging whether the bus voltage exceeds the limit twice, and judging whether the optimized upper limit value of the 10 kilovolt bus voltage exceeds the range N and whether the optimized lower limit value of the 35 kilovolt bus voltage exceeds the range M;
if any one exceeds the range, the step D9 is entered;
if both are not out of range, enter step D11;
d11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step D12;
D12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step D1; if not, the step E is entered.

Claims (9)

1. The voltage limit value optimization method of the automatic voltage control system based on the two-stage complementation is characterized by comprising the following steps of:
a: judging whether the station capacitor has frequent switching phenomenon or not; if so, entering the step B; if not, judging whether the station capacitor frequently drops or drops again after setting time interval;
b: acquiring a capacitor switching record, and judging the frequent switching reason of the capacitor according to the capacitor switching record;
if the capacitor switching record comprises the conditions of low voltage of 10 kilovolt bus, high voltage of capacitor switching, high voltage of 35 kilovolt bus, capacitor switching-out and low voltage of 10 kilovolt bus, the reason for frequent switching of the capacitor is judged to be that the voltage of 10 kilovolt bus is low, and the step C is entered;
if the capacitor switching record comprises the conditions of high voltage of 10 kilovolt bus, withdrawal of the capacitor, low voltage of 35 kilovolt bus, input of the capacitor and high voltage of 10 kilovolt bus, judging that the reason for frequent switching of the capacitor is that the voltage of the 10 kilovolt bus is high, and entering the step D;
C: adopting a two-stage complementary mode to circularly adjust the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step C; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
d: adopting a two-stage complementary mode to circularly adjust the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus according to a set adjusting amplitude; after the circulation adjustment is completed, observing whether frequent switching of the capacitor still occurs in a set observation period; if still, re-executing the step D; if the frequent switching-on and switching-off phenomenon of the capacitor does not occur, the step E is entered;
e: ending the voltage limit value adjustment and outputting the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus;
the step C comprises the following steps:
c1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit [ U ] H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step C2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
c2: updating the upper voltage limit value of the 35 kilovolt bus, and the upper voltage limit value of the 35 kilovolt busThe update formula of the value isThen enter step C3;
wherein ,for the updated upper limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
and C3: after the upper limit value of the 35 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10; if frequent switching still occurs, entering a step C4;
and C4: carrying out primary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, the step C7 is carried out; if the range is not exceeded, the step C5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
c5: updating the lower limit value of the 10 kilovolt bus voltage, wherein the updating formula of the lower limit value of the 10 kilovolt bus voltage is as follows Then enter step C6;
wherein ,for the updated lower limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
c6: after the lower limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, entering a step C10; if frequent switching still occurs, entering a step C7;
c7: judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the upper limit value of the 35 kilovolt bus voltage exceeds a range M or not;
if the range is out, the step C8 is carried out; if the current value of n2 is not beyond the range, updating n2, adding 1 on the basis of the current value of n2, and then entering a step C2;
m is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
and C8: performing secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds a range N or not;
if the range is out, the step C9 is carried out;
if the current value of n1 is not beyond the range, updating n1, adding 1 on the basis of the current value of n1, and then entering a step C5;
c9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode by optimizing the capacity and the number of groups of the capacitors when the plant has no proper voltage limit value under the specification of the capacitor;
C10: judging whether the bus voltage exceeds the limit once, and judging whether the optimized lower limit value of the 10 kilovolt bus voltage exceeds the range N and whether the upper limit value of the 35 kilovolt bus voltage exceeds the range M;
if any one exceeds the range, entering a step C9; if both are not out of range, enter step C11;
c11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step C12;
and C12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step C1; if not, the step E is entered.
2. The automatic voltage control system voltage limit optimization method based on double-stage complementation according to claim 1, wherein the method comprises the following steps: in the step a, if the number of times of switching the station capacitor is higher than the set switching threshold value within the continuous T minutes, it is determined that the switching is frequently performed.
3. The automatic voltage control system voltage limit optimizing method based on double-stage complementation according to claim 2, wherein: the switching threshold is T' times.
4. The method for optimizing voltage limit value of automatic voltage control system based on two-stage complementation according to claim 1, wherein in said step C, the method for cyclic adjustment is as follows:
Firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
adjusting the upper voltage limit value of the 35 kilovolt bus; the initial upper limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial upper limit value of the voltage of the 35 kilovolt bus is increased;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit for one time;
the primary judgment process of whether the bus voltage exceeds the limit is as follows: if the voltage lower limit value of the 10 kilovolt bus and the voltage upper limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, and optimizing the capacitor capacity and the group number to determine the optimal compensation capacity and distribution mode;
if the frequent switching phenomenon still exists, judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
the primary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the upper limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
The judging process of whether the upper limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the upper voltage limit value of the 35 kilovolt bus;
the secondary judging process of whether the lower limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, and optimizing the capacity and the number of groups of the capacitor to determine the optimal compensation capacity and the distribution mode; if the voltage is not beyond the range, continuously adjusting the lower limit value of the 10 kilovolt bus voltage;
the lower limit value adjusting method of the 10 kilovolt bus voltage comprises the following steps: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the lower limit value of the 10 kilovolt bus voltage is reduced;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit; if the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not.
5. The method for optimizing voltage limit value of automatic voltage control system based on two-stage complementation according to claim 1, wherein in the step D, the method for cyclic adjustment is as follows:
Firstly, obtaining initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing cyclic adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus; the initial lower limit value adjusting method of the voltage of the 35 kilovolt bus is as follows: reducing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice;
the process of secondary judgment of whether the bus voltage exceeds the limit is as follows: if the upper voltage limit value of the 10 kilovolt bus and the lower voltage limit value of the 35 kilovolt bus are not beyond the range, ending the voltage limit value adjustment and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that the capacitor has no proper voltage limit value, and optimizing the capacitor capacity and the group number to determine the optimal compensation capacity and distribution mode;
if the frequent switching phenomenon still exists, judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range or not at one time;
the primary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
The judging process of whether the lower limit value of the 35 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds the range; if the voltage is not beyond the range, continuing to adjust the lower voltage limit value of the 35 kilovolt bus;
the secondary judging process of whether the upper limit value of the 10 kilovolt bus voltage exceeds the range is as follows: if the voltage exceeds the range, judging that the capacitor has no proper voltage limit value, and optimizing the capacity and the number of groups of the capacitor to determine the optimal compensation capacity and the distribution mode; if the voltage is not beyond the range, continuously adjusting the upper limit value of the 10 kilovolt bus voltage;
the method for adjusting the upper limit value of the 10 kilovolt bus voltage comprises the following steps: increasing according to the set adjustment amplitude, and judging whether the capacitor still has frequent switching after the upper limit value of the 10 kilovolt bus voltage is increased;
if the frequent switching phenomenon does not exist, judging whether the bus voltage exceeds the limit twice; if the frequent switching phenomenon still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range or not.
6. The automatic voltage control system voltage limit optimization method based on double-stage complementation according to claim 1, wherein the method comprises the following steps: in the steps C and D, the adjustment step delta is respectively set for the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus L and δH Setting the adjustment amplitude of each time of the voltage limit value of the 10 kilovolt bus to be n1 delta by setting the first intermediate variable n1 and the second intermediate variable n2 L The voltage limit value of the 35 KV bus is regulated to be n2 x delta each time H 。
7. The method for optimizing voltage limit of automatic voltage control system based on two-stage complementation according to claim 1, wherein said step D comprises the steps of:
d1: reading the bus voltage limit value to obtain 10 KV bus voltage limit value [ U ] L1 ，U L2 ]35 KV bus voltage limit [ U ] H1 ，U H2 ]Initializing variables n1 and n2, defaulting the initial values of n1 and n2 to 1, and then entering a step D2;
wherein ,UL1 Is 10 kilovolt bus voltage initial lower limit value, U L2 Initial upper limit value of 10 KV bus voltage, U H1 Is 35 KV bus voltage initial lower limit value, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is set, and variables n1 and n2 are positive integers;
d2: updating the lower voltage limit value of the 35 kilovolt bus, wherein the updating formula of the lower voltage limit value of the 35 kilovolt bus is as followsThen enter step D3;
wherein ,for the updated lower limit value of 35 KV bus voltage delta H The step length of the bus is adjusted to 35 kilovolts;
d3: after the voltage lower limit value of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
If the switching is not carried out frequently, the step D10 is carried out; if frequent switching still occurs, the step D4 is entered;
d4: carrying out primary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D7 is carried out; if the range is not exceeded, the step D5 is carried out;
n is N1, N2, N is the qualified range of the voltage of the 10 kilovolt bus specified by the power system, N1 is the lower limit value of the qualified range, and N2 is the upper limit value of the qualified range;
d5: updating the upper limit value of the 10 kilovolt bus voltage, wherein the updating formula of the upper limit value of the 10 kilovolt bus voltage is as followsThen enter step D6;
wherein ,for the updated upper limit value of 10 KV bus voltage delta L The step length of the adjustment is 10 kilovolt bus;
d6: after the upper limit value of the 10 kilovolt bus voltage is updated, judging whether the capacitor is frequently switched on or off;
if the switching is not carried out frequently, the step D10 is carried out; if frequent switching still occurs, a step D7 is entered;
d7: judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range or not, and judging whether the lower limit value of the 35 kilovolt bus voltage exceeds a range M or not;
if the range is out, the step D8 is carried out; if the current value of n2 is not beyond the range, updating n2, adding 1 on the basis of the current value of n2, and then entering a step D2;
M is M1, M2, M is a qualified range of 35 kilovolt bus voltage specified by a power system, M1 is a lower limit value of the qualified range, and M2 is an upper limit value of the qualified range;
d8: performing secondary judgment on whether the upper limit value of the 10 kilovolt bus voltage exceeds a range, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds a range N;
if the range is out, the step D9 is carried out; if the current value of n1 is not beyond the range, updating n1, adding 1 on the basis of the current value of n1, and then entering a step D5;
d9: judging that the capacitor has no proper voltage limit value, and determining the optimal compensation capacity and distribution mode by optimizing the capacity and the number of groups of the capacitors when the plant has no proper voltage limit value under the specification of the capacitor;
d10: judging whether the bus voltage exceeds the limit twice, and judging whether the optimized upper limit value of the 10 kilovolt bus voltage exceeds the range N and whether the optimized lower limit value of the 35 kilovolt bus voltage exceeds the range M;
if any one exceeds the range, the step D9 is entered; if both are not out of range, enter step D11;
d11: ending the voltage limit adjustment and determining the latest voltage limit of the 10 kilovolt bus and the 35 kilovolt bus; then go to step D12;
d12: in the observation period of not less than 24 hours, observing whether frequent switching of the capacitor still occurs; if the current state still appears, returning to the step D1; if not, the step E is entered.
8. The two-stage complementary-based automatic voltage control system voltage limit optimization method according to claim 7, wherein: the step length delta is adjusted L and δH All 0.1 was used.
9. The automatic voltage control system voltage limit optimization method based on double-stage complementation according to claim 1, wherein the method comprises the following steps: the time of the observation period is not less than 24 hours.
CN202210713654.3A 2022-06-22 2022-06-22 Automatic voltage control system voltage limit value optimization method based on double-stage complementation Active CN115051370B (en)

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