CN115051370A - Automatic voltage control system voltage limit value optimization method based on two-stage complementation - Google Patents
Automatic voltage control system voltage limit value optimization method based on two-stage complementation Download PDFInfo
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- 238000012423 maintenance Methods 0.000 description 4
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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
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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
- H02J3/04—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
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- 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
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Abstract
The invention discloses a voltage limit value optimization method of an automatic voltage control system based on two-stage complementation, which is characterized by comprising the following steps of: a: judging whether a frequent switching phenomenon occurs or not; if yes, entering the step B; b: acquiring a capacitor switching record and frequently switching on and off reasons, and entering the step C or the step D; c: circularly adjusting the lower limit value of the voltage of the 10 kilovolt bus and the upper limit value of the voltage of the 35 kilovolt bus; then observing whether frequent switching-in and switching-out still occur; re-execution of step C occurs; if not, entering the step E; d: circularly adjusting the voltage upper limit value of the 10 kilovolt bus and the voltage lower limit value of the 35 kilovolt bus; then observing whether frequent switching-in and switching-out still occur; re-execution of step D occurs; if not, entering the step E; e: and finishing the voltage limit value adjustment and outputting the voltage limit value. The invention can quickly and effectively adjust the bus voltage limit value, thereby avoiding the problem of frequent switching on and off of capacitor equipment.
Description
Technical Field
The invention relates to a voltage limit optimization method, in particular to a voltage limit optimization method of an automatic voltage control system based on double-stage complementation.
Background
With the continuous expansion of the scale of the power grid, the national grid company puts higher requirements on the quality of the electric energy, the voltage is taken as an important index for measuring the quality of the electric energy, and the quality of the electric energy not only affects the life safety of residents and the service life of electric equipment, but also has great influence on the economy and the safety of the operation of the power grid. The output of equipment such as power transformation, power transmission, power distribution and the like of the power grid is reduced due to too low voltage, the power loss and energy consumption of the equipment are increased, even voltage breakdown accidents occur, and the safe and stable operation of the power grid is influenced; too high voltage can affect the insulativity of the equipment, 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 a power grid is increased, so that the safe and economic operation of a power system is damaged. Therefore, an automatic voltage control (hereinafter referred to as AVC) system is widely adopted to effectively adjust the bus voltage of each substation, so as to ensure that the bus voltage is adjusted to a normal range when the bus voltage exceeds a normal operation range in the power system.
However, most of the bus voltage regulation schemes commonly used at present rely on experience and subjective judgment to set the upper and lower limit values of the bus voltage, the upper and lower limit values of the bus voltage cannot be used for regulating the voltage when the setting range of the voltage is too large, and the capacitor is very easy to frequently switch on and off when the setting range of the upper and lower limit values of the voltage is too small, the frequent switching on and off is mainly caused by the fact that 10kv and 35kv buses cannot meet the requirements of the upper and lower limit values at the same time, and the service life of equipment is seriously influenced.
Disclosure of Invention
The invention aims to provide a voltage limit optimization method of an automatic voltage control system based on two-stage complementation, which can be used for comprehensively considering the upper and lower limits of 10kV and 35kV bus voltages of the same station, and quickly and effectively adjusting the bus voltage limits by adopting a method of graded optimization and two-stage complementation, so that the problem of frequent switching of capacitor equipment under AVC control is avoided, and the electric energy quality is improved.
The invention adopts the following technical scheme:
a voltage limit optimization method of an automatic voltage control system based on two-stage complementation comprises the following steps:
a: judging whether the plant capacitor has frequent switching phenomenon; if yes, entering the step B; if the capacitor does not appear, judging whether the plant capacitor appears frequently or not again after the interval of set time;
b: acquiring a capacitor switching record, and judging the reason for frequent switching of the capacitor according to the capacitor switching record;
if the capacitor on-off record contains the conditions of '10 kV bus voltage low → capacitor on → 35kV bus voltage high → capacitor off → 10kV bus voltage low', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage low, and entering the step C;
if the capacitor on-off record contains the conditions of '10 kV bus voltage → capacitor off → 35kV bus voltage low → capacitor on → 10kV bus voltage high', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage, and entering the step D;
c: performing cyclic adjustment on the lower limit value of the voltage of the 10 kilovolt bus and the upper limit value of the voltage of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if the situation still occurs, the step C is executed again; if the capacitor is not frequently switched on and off, entering the step E;
d: performing cyclic adjustment on the voltage upper limit value of the 10 kilovolt bus and the voltage lower limit value of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if yes, re-executing the step D; if the capacitor is not frequently switched on and off, entering the step E;
e: and finishing the voltage limit value adjustment, and outputting the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus.
In the step A, if the switching times of the factory station capacitor are higher than the set switching threshold value within continuous T minutes, the frequent switching is determined.
The switching threshold value is T times.
In the step C, the method of cycle adjustment is as follows:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
adjusting the upper limit value of the voltage of the 35 kilovolt bus; the method for adjusting the initial upper limit value of the voltage of the 35 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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 once;
the process of judging whether the bus voltage exceeds the limit once 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 do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode;
if the phenomenon of frequent switching still exists, judging whether the lower limit value of the 10kV bus voltage exceeds the range once;
the primary judgment process of whether the voltage lower limit value of the 10 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the judgment process of whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the voltage lower limit value of the 10 kilovolt bus is out of range; if the voltage does not exceed the range, continuously adjusting the upper limit value of the voltage of the 35 kilovolt bus;
the secondary judgment process of whether the voltage lower limit value of the 10 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode; if the voltage does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the method for adjusting the lower limit value of the voltage of the 10 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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; and if the phenomenon of frequent switching is still existed, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range.
In the step D, the method of cyclic adjustment is as follows:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus; the method for adjusting the initial lower limit value of the voltage of the 35 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit;
the process of judging whether the bus voltage exceeds the limit for the second time is as follows: if the upper limit value of the 10 kilovolt bus and the lower limit value of the 35 kilovolt bus do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode;
if the frequent switching phenomenon still exists, judging whether the upper limit value of the 10kV bus voltage exceeds the range once;
the primary judgment 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 does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the judgment process of whether the lower limit value of the voltage of the 35 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the voltage of the 35 kilovolt bus;
the secondary judgment 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 no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode; if the voltage does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the method for adjusting the upper limit value of the voltage of the 10 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the upper limit value of the 10kV bus voltage is increased;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit; and if the phenomenon of frequent switching is still existed, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range.
In the steps C and D, 10 kilovolts are aimedSetting adjustment step length delta for voltage limit values of buses and 35 kilovolt buses respectively L and δH And setting a first intermediate variable n1 and a second intermediate variable n2, wherein the adjustment range of the 10 kilovolt bus voltage limit value is n1 delta each time L The voltage limit value of the 35KV bus is adjusted to n2 delta each time H 。
The step C comprises the following steps:
c1: reading the bus voltage limit value to obtain the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step C2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is obtained, and variables n1 and n2 are positive integers;
c2: the upper limit value of the 35 kilovolt bus is updated according to the formula
Then proceed to step C3;
wherein ,
is an updated upper limit value delta of the 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
c3: after the upper limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the quit is not frequently thrown, the step C10 is entered; if frequent drops still occur, go to step C4;
c4: judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, go to step C7; if not, go to step C5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
c5: the lower limit value of the 10 kilovolt bus is updated, and the updating formula of the lower limit value of the 10 kilovolt bus is as follows
Then go to step C6;
wherein ,
is the updated lower limit value delta of the 10 kilovolt bus L The adjustment step length 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 quit is not frequently thrown, the step C10 is entered; if frequent drops still occur, go to step C7;
c7: judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is out, go to step C8; if not, updating n2, adding 1 on the basis of the current value of n2, and then entering the step C2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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;
c8: carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N or not;
if the range is out, go to step C9;
if not, updating n1, adding 1 on the basis of the current value of n1, and then entering the step C5;
c9: judging that no proper voltage limit value exists under the capacitor, and indicating that no proper voltage limit value exists in the plant station under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and the optimal distribution mode;
c10: judging whether the bus voltage exceeds the limit once, and judging whether the lower limit value of the optimized 10kV bus voltage exceeds the range N and whether the upper limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step C9; if neither is out of range, go to step C11;
c11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then proceed to step C12;
c12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to step C1; and if not, entering the step E.
The step D comprises the following steps:
d1: reading the bus voltage limit value to obtain the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step D2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the 35kV bus voltage is obtained, and variables n1 and n2 are positive integers;
d2: the lower limit value of the 35 kilovolt bus is updated, and the updating formula of the lower limit value of the 35 kilovolt bus is as follows
Then step D3 is entered;
wherein ,
for an updated lower limit value, delta, for a 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
d3: after the lower limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the switching-in and the switching-out are not frequently carried out any more, the step D10 is entered; if frequent break-back still occurs, go to step D4;
d4: judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is exceeded, the step D7 is carried out; if not, go to step D5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
d5: the upper limit value of the 10 kilovolt bus is updated according to the formula
Then step D6 is entered;
wherein ,
is an updated upper limit value delta of the 10 kilovolt bus L The adjustment step length 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-in and the switching-out are not frequently carried out any more, the step D10 is entered; if frequent break-back still occurs, go to step D7;
d7: judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is exceeded, the step D8 is carried out; if not, updating n2, adding 1 on the basis of the current value of n2, and then entering the step D2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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: carrying out secondary judgment on whether the upper limit value of the 10kV bus voltage exceeds the range or not, and judging whether the upper limit value of the 10kV bus voltage exceeds the range N or not;
if the range is exceeded, the step D9 is carried out; if not, updating n1, adding 1 on the basis of the current value of n1, and then entering the step D5;
d9: judging that no proper voltage limit value exists under the capacitor, and indicating that no proper voltage limit value exists in the plant station under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and the optimal distribution mode;
d10: carrying out secondary judgment on whether the bus voltage exceeds the limit, and judging whether the upper limit value of the optimized 10kV bus voltage exceeds the range N and whether the lower limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step D9; if neither is out of range, go to step D11;
d11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then step D12 is entered;
d12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to the step D1; and if not, entering the step E.
The adjustment step delta L and δH All use 0.1.
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 reason of frequent switching of the capacitor is divided into two conditions of '10 kV bus voltage low' and '10 kV bus voltage high' according to the trigger condition of frequent switching of the capacitor, and the voltage limit values in the two conditions are adjusted circularly according to the set adjustment range, so that the current situation that personal experience of operation and maintenance personnel is dominant and the adjustment process of the limit values is blind in the existing bus voltage limit value adjustment scheme is changed, the adjustment of the bus voltage limit value can be completed efficiently and accurately, the problem of frequent switching of capacitor equipment under AVC control is solved, and the power quality is improved.
The inventionSetting adjustment step length delta for voltage limit values of 10 kilovolt buses and 35 kilovolt buses respectively L and δH And setting the first intermediate variable n1 and the second intermediate variable n2 to make the adjustment range of the 10 kilovolt bus voltage limit value be n1 delta each time L The voltage limit value of the 35KV bus is adjusted to n2 delta each time H The voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus can be adjusted in a grading mode, refinement and quantification of the voltage limit value adjusting process are achieved, and finally the purpose of achieving limit value optimization under the variable scale by changing the adjusting step length, controlling the single limit value adjusting scale, and further changing the fineness degree of the whole limit value adjusting process is achieved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic flow chart of step C of 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 following figures and examples:
as shown in fig. 1 to 3, the method for optimizing the voltage limit of the automatic voltage control system based on the two-stage complementation according to the present invention includes the following steps:
a: judging whether the plant capacitor has frequent switching phenomenon; if yes, entering the step B; if the capacitor does not appear, judging whether the plant capacitor appears frequently or not again after the interval of set time;
in the invention, if the switching-in and switching-out times of the factory station capacitor are higher than a set switching-in and switching-out threshold value within continuous T minutes, the frequent switching-in and switching-out is judged; the switching threshold value can be adjusted according to actual field, the switching threshold value set in the invention is T times, namely, the capacitor can only be switched in or switched out once at most every minute.
B: acquiring a capacitor switching record, and judging the reason for frequent switching of the capacitor according to the capacitor switching record;
if the capacitor on-off record contains the conditions of '10 kV bus voltage low → capacitor on → 35kV bus voltage high → capacitor off → 10kV bus voltage low', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage low, and entering the step C;
if the capacitor on-off record contains the conditions of '10 kV bus voltage → capacitor off → 35kV bus voltage low → capacitor on → 10kV bus voltage high', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage, and entering the step D;
at present, the existing bus voltage limit value adjusting scheme mainly takes personal experience of operation and maintenance personnel, a mature limit value adjusting scheme is not provided for the operation and maintenance personnel to refer, the limit value adjusting process is relatively blind, the capacitor is frequently switched on and off and cannot be timely processed, and the safe operation of a power grid is seriously influenced.
In order to standardize and standardize the adjustment scheme of the upper and lower limit values of the bus voltage and facilitate operation and maintenance personnel to carry out targeted optimization on the upper and lower limit values of the bus voltage so as to solve the problem of frequent switching on and off of the capacitor, the invention judges the reason of frequent switching on and off of the capacitor by analyzing the record of frequent switching on and off of the capacitor in the existing D5000 system. The conventional bus voltage limit setting principle under AVC control adopts a relatively general configuration principle, i.e. the voltage limit is only related to the voltage class (e.g. 10kV, 35kV) or the type of time period (e.g. 00:00:00 to 11:59: 59; 12:00:00 to 23:59:59), although the conventional bus voltage limit setting method is simple, but the invention is not beneficial to the optimization of AVC control strategy at the dispatching end, realizes the accurate control of the power grid voltage, and in order to break the defects that the traditional bus voltage limit setting under the AVC control is easy to cause the frequent switching on and off of the capacitor and seriously affects the service life of capacitor equipment, ensures that the AVC utilizes the optimal control strategy to achieve the aim of effectively regulating the voltage, and accurately sets the bus voltage limit according to local conditions, and the invention divides the frequent switching on and off reasons of the capacitor into two conditions of '10 KV bus voltage low' and '10 KV bus voltage high'. Therefore, the invention respectively analyzes the two conditions of '10 kV bus voltage low' and '10 kV bus voltage high' after classification, further defines the problem solving idea and the voltage limit value adjusting method, and solves the problem of frequent switching more efficiently, more quickly and more accurately.
The D5000 system is called as a smart grid dispatching control system, the system is widely used, AVC is a high-level application module in the system, the AVC module can record each switching-in and switching-out action of the capacitor, and simultaneously records information such as switching-in and switching-out reasons, switching-in and switching-out time and switching-in and switching-out success of the capacitor.
C: performing cyclic adjustment on the lower limit value of the voltage of the 10 kilovolt bus and the upper limit value of the voltage of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if the situation still occurs, the step C is executed again; if the capacitor is not frequently switched on and off, entering the step E;
the method of cycle adjustment is as follows:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
adjusting the upper limit value of the voltage of the 35 kilovolt bus;
the method for adjusting the initial upper limit value of the voltage of the 35 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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 once;
the process of judging whether the bus voltage exceeds the limit once 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 do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and local balance;
if the phenomenon of frequent switching still exists, judging whether the lower limit value of the 10kV bus voltage exceeds the range once;
the primary judgment process of whether the voltage lower limit value of the 10 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the judgment process of whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the voltage lower limit value of the 10 kilovolt bus is out of range; if the voltage does not exceed the range, continuously adjusting the upper limit value of the voltage of the 35 kilovolt bus;
the secondary judgment process of whether the voltage lower limit value of the 10 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and in-situ balance; if the voltage does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the method for adjusting the lower limit value of the voltage of the 10 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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 phenomenon of frequent switching-on and switching-off still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range;
d: performing cyclic adjustment on the voltage upper limit value of the 10 kilovolt bus and the voltage lower limit value of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if yes, re-executing the step D; if the capacitor is not frequently switched on and off, entering the step E;
the method of cycle adjustment is as follows:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus;
the method for adjusting the initial lower limit value of the voltage of the 35 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit;
the process of judging whether the bus voltage exceeds the limit for the second time is as follows: if the upper limit value of the 10 kilovolt bus and the lower limit value of the 35 kilovolt bus do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and local balance;
if the frequent switching phenomenon still exists, judging whether the upper limit value of the 10kV bus voltage exceeds the range once;
the primary judgment process of whether the upper limit value of the 10 kilovolt bus is out of 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 does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the judgment process of whether the lower limit value of the voltage of the 35 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the voltage of the 35 kilovolt bus;
the secondary judgment 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 no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and in-situ balance; if the voltage does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the method for adjusting the upper limit value of the voltage of the 10 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the upper limit value of the 10kV bus voltage is increased;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit;
if the phenomenon of frequent switching-on and switching-off still exists, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range;
e: and finishing the voltage limit value adjustment, and outputting the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus.
In this embodiment, in order to ensure the stability of the 10kv bus and the 35kv bus after the voltage limit is optimized and determine the rationality of the optimized limit, the set observation period is not less than 24 hours.
In order to adjust the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus in a grading way, a first intermediate variable n1 and a second intermediate variable n2 are arranged in the embodiment, and n1 and n2 are independently set to determine the adjustment range of the voltage limit values; meanwhile, in order to realize the refinement and quantification of the voltage limit value adjusting process, the invention also respectively sets the adjusting step length delta aiming at the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus L and δH (ii) a Finally, the adjustment amplitude of each time of the 10 kilovolt bus voltage limit value is determined to be n1 delta L The voltage limit value of the 35KV bus is adjusted to n2 delta each time H Therefore, the single limit adjustment scale can be controlled by changing the adjustment step length, the fine degree of the whole limit adjustment process is further changed, and the limit optimization under the variable scale is realized. In this embodiment, the step δ is adjusted L and δH 0.1 may be used.
The adjustment step δ is combined below with the first intermediate variable n1 and the second intermediate variable n2 L and δH Step C and step D in the invention are further refined;
the step C comprises the following specific steps:
c1: reading the bus voltage limit value to obtain the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step C2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is obtained, and variables n1 and n2 are positive integers;
c2: the upper limit value of the 35 kilovolt bus is updated according to the formula
Then proceed to step C3;
wherein ,
is an updated upper limit value delta of the 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
c3: after the upper limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the quit is not frequently thrown, the step C10 is entered;
if frequent drops still occur, go to step C4;
c4: judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, go to step C7;
if not, go to step C5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
c5: the lower limit value of the 10 kilovolt bus is updated, and the updating formula of the lower limit value of the 10 kilovolt bus is as follows
Then proceed to step C6;
wherein ,
for an updated lower limit value, delta, for a 10 kilovolt bus L The adjustment step length 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 quit is not frequently thrown, the step C10 is entered;
if frequent drops still occur, go to step C7;
c7: judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is out, go to step C8;
if the current value of n2 is not out of range, updating n2, making n2 equal to n2+1, namely adding 1 to the current value of n2, and then entering step C2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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;
c8: carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N or not;
if the range is out, go to step C9;
if the current value of n1 is not out of range, updating n1, making n1 equal to n1+1, namely adding 1 to the current value of n1, and then entering step C5;
c9: judging that no proper voltage limit value exists under the capacitor, and indicating that the plant station has no proper voltage limit value under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and local balance;
c10: judging whether the bus voltage exceeds the limit once, and judging whether the lower limit value of the optimized 10kV bus voltage exceeds the range N and whether the upper limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step C9;
if neither is out of range, go to step C11;
c11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then proceed to step C12;
c12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to 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 the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step D2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is obtained, and variables n1 and n2 are positive integers;
d2: the lower limit value of the 35 kilovolt bus is updated, and the updating formula of the lower limit value of the 35 kilovolt bus is as follows
Then step D3 is entered;
wherein ,
for an updated lower limit value, delta, for a 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
d3: after the lower limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the switching-in and the switching-out are not frequently carried out any more, the step D10 is entered;
if frequent break-back still occurs, go to step D4;
d4: judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is exceeded, the step D7 is carried out;
if not, go to step D5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
d5: the upper limit value of the 10 kilovolt bus is updated according to the formula
Then step D6 is entered;
wherein ,
is an updated upper limit value delta of the 10 kilovolt bus L The adjustment step length 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-in and the switching-out are not frequently carried out any more, the step D10 is entered;
if frequent break-back still occurs, go to step D7;
d7: judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is exceeded, the step D8 is carried out;
if the current value of n2 is not out of range, updating n2, making n2 equal to n2+1, namely adding 1 to the current value of n2, and then entering step D2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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: carrying out secondary judgment on whether the upper limit value of the 10 kilovolt bus is out of range or not, and judging whether the upper limit value of the 10 kilovolt bus is out of range N or not;
if the range is exceeded, go to step D9;
if the current value of n1 is not out of range, updating n1, making n1 equal to n1+1, namely adding 1 to the current value of n1, and then entering step D5;
d9: judging that no proper voltage limit value exists under the capacitor, and indicating that the plant station has no proper voltage limit value under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and distribution mode according to the principles of comprehensive planning, reasonable layout, layered and partitioned compensation and local balance;
d10: carrying out secondary judgment on whether the bus voltage exceeds the limit, and judging whether the upper limit value of the optimized 10kV bus voltage exceeds the range N and whether the lower limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step D9;
if neither is out of range, go to step D11;
d11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then step D12 is entered;
d12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to the step D1; and if not, entering the step E.
Claims (10)
1. A voltage limit optimization method of an automatic voltage control system based on two-stage complementation is characterized by comprising the following steps:
a: judging whether the plant capacitor has frequent switching phenomenon; if yes, entering the step B; if the capacitor does not appear, judging whether the plant capacitor appears frequently or not again after the interval of set time;
b: acquiring a capacitor switching-on/off record, and judging the reason of frequent switching-on/off of the capacitor according to the capacitor switching-on/off record;
if the capacitor on-off record contains the conditions of '10 kV bus voltage low → capacitor on → 35kV bus voltage high → capacitor off → 10kV bus voltage low', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage low, and entering the step C;
if the capacitor on-off record contains the conditions of '10 kV bus voltage → capacitor off → 35kV bus voltage low → capacitor on → 10kV bus voltage high', judging that the reason for frequent on-off of the capacitor is 10kV bus voltage, and entering the step D;
c: performing cyclic adjustment on the lower limit value of the voltage of the 10 kilovolt bus and the upper limit value of the voltage of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if the situation still occurs, the step C is executed again; if the capacitor is not frequently switched on and off, entering the step E;
d: performing cyclic adjustment on the voltage upper limit value of the 10 kilovolt bus and the voltage lower limit value of the 35 kilovolt bus in a two-stage complementary mode according to a set adjustment range; after the cyclic adjustment is finished, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs in a set observation period; if yes, re-executing the step D; if the capacitor is not frequently switched on and off, entering the step E;
e: and finishing the voltage limit value adjustment, and outputting the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus.
2. The method of claim 1, wherein the method comprises: in the step A, if the switching times of the factory station capacitor are higher than the set switching threshold value within continuous T minutes, the frequent switching is determined.
3. The method of claim 2, wherein the method comprises: the switching threshold value is T times.
4. The method of claim 1, wherein in step C, the cyclic adjustment method comprises:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
adjusting the upper limit value of the voltage of the 35 kilovolt bus; the method for adjusting the initial upper limit value of the voltage of the 35 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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 once;
the process of judging whether the bus voltage exceeds the limit once 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 do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode;
if the phenomenon of frequent switching still exists, judging whether the lower limit value of the 10kV bus voltage exceeds the range once;
the primary judgment process of whether the voltage lower limit value of the 10 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the judgment process of whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, carrying out secondary judgment on whether the voltage lower limit value of the 10 kilovolt bus is out of range; if the voltage does not exceed the range, continuously adjusting the upper limit value of the voltage of the 35 kilovolt bus;
the secondary judgment process of whether the voltage lower limit value of the 10 kilovolt bus exceeds the range is as follows: if the voltage exceeds the range, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode; if the voltage does not exceed the range, continuously adjusting the lower limit value of the 10kV bus voltage;
the method for adjusting the lower limit value of the voltage of the 10 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon 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; and if the phenomenon of frequent switching is still existed, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range.
5. The method of claim 1, wherein in step D, the cyclic adjustment method comprises the following steps:
firstly, acquiring initial voltage limit values of a 10 kilovolt bus and a 35 kilovolt bus, and then performing circular adjustment according to the following mode;
firstly, adjusting the lower voltage limit value of a 35 kilovolt bus; the method for adjusting the initial lower limit value of the voltage of the 35 kilovolt bus comprises the following steps: reducing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the initial lower limit value of the voltage of the 35 kilovolt bus is reduced;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit;
the process of judging whether the bus voltage exceeds the limit for the second time is as follows: if the upper limit value of the 10 kilovolt bus and the lower limit value of the 35 kilovolt bus do not exceed the range, finishing the adjustment of the voltage limit values, and determining the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; otherwise, judging that no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode;
if the frequent switching phenomenon still exists, judging whether the upper limit value of the 10kV bus voltage exceeds the range once;
the primary judgment process of whether the upper limit value of the 10 kilovolt bus is out of 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 does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the judgment process of whether the lower limit value of the voltage of the 35 kilovolt bus 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 does not exceed the range, continuously adjusting the lower limit value of the voltage of the 35 kilovolt bus;
the secondary judgment 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 no proper voltage limit value exists under the capacitor, optimizing the capacity and the number of groups of the capacitor, and determining the optimal compensation capacity and the optimal distribution mode; if the voltage does not exceed the range, continuously adjusting the upper limit value of the 10kV bus voltage;
the method for adjusting the upper limit value of the voltage of the 10 kilovolt bus comprises the following steps: increasing according to the set adjustment amplitude, and then judging whether the capacitor still has the frequent switching phenomenon after the upper limit value of the 10kV bus voltage is increased;
if the frequent switching phenomenon does not exist, carrying out secondary judgment on whether the bus voltage exceeds the limit; and if the phenomenon of frequent switching is still existed, judging whether the lower limit value of the 35 kilovolt bus voltage exceeds the range.
6. The method of claim 1, wherein the method comprises: in the steps C and D, the adjustment step length delta is respectively set for the voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus L and δH And setting a first intermediate variable n1 and a second intermediate variable n2, wherein the adjustment range of the 10 kilovolt bus voltage limit value is n1 delta each time L The voltage limit value of the 35KV bus is adjusted to n2 delta each time H 。
7. The method of claim 1, wherein the step C comprises the steps of:
c1: reading the bus voltage limit value to obtain the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step C2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is obtained, and variables n1 and n2 are positive integers;
c2: the upper limit value of the 35 kilovolt bus is updated according to the formula
Then proceed to step C3;
wherein ,
is an updated upper limit value delta of the 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
c3: after the upper limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the quit is not frequently thrown, the step C10 is entered; if frequent drops still occur, go to step C4;
c4: judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is out, go to step C7; if not, go to step C5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
c5: the lower limit value of the 10 kilovolt bus is updated, and the updating formula of the lower limit value of the 10 kilovolt bus is as follows
Then proceed to step C6;
wherein ,
for an updated lower limit value, delta, for a 10 kilovolt bus L The adjustment step length 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 quit is not frequently thrown, the step C10 is entered; if frequent drops still occur, go to step C7;
c7: judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the upper limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is out, go to step C8; if not, updating n2, adding 1 on the basis of the current value of n2, and then entering the step C2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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;
c8: carrying out secondary judgment on whether the lower limit value of the 10 kilovolt bus voltage exceeds the range or not, and judging whether the lower limit value of the 10 kilovolt bus voltage exceeds the range N or not;
if the range is out, go to step C9;
if not, updating n1, adding 1 on the basis of the current value of n1, and then entering the step C5;
c9: judging that no proper voltage limit value exists under the capacitor, and indicating that no proper voltage limit value exists in the plant station under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and the optimal distribution mode;
c10: judging whether the bus voltage exceeds the limit once, and judging whether the lower limit value of the optimized 10kV bus voltage exceeds the range N and whether the upper limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step C9; if neither is out of range, go to step C11;
c11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then proceed to step C12;
c12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to step C1; and if not, entering the step E.
8. The method of claim 1, wherein the step D comprises the steps of:
d1: reading the bus voltage limit value to obtain the 10KV bus voltage limit value U L1 ，U L2 ]35KV 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 the step D2;
wherein ,UL1 Is an initial lower limit value of 10kV bus voltage, U L2 Is an initial upper limit value of 10kV bus voltage, U H1 Is an initial lower limit value of 35kV bus voltage, U H2 The initial upper limit value of the voltage of the 35 kilovolt bus is obtained, and variables n1 and n2 are positive integers;
d2: the lower limit value of the 35 kilovolt bus is updated, and the updating formula of the lower limit value of the 35 kilovolt bus is as follows
Then step D3 is entered;
wherein ,
for an updated lower limit value, delta, for a 35 kilovolt bus H The adjustment step length is 35 kilovolt bus;
d3: after the lower limit value of the voltage of the 35 kilovolt bus is updated, judging whether the capacitor is frequently switched on or off;
if the switching-in and the switching-out are not frequently carried out any more, the step D10 is entered; if frequent break-back still occurs, go to step D4;
d4: judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range once, and judging whether the upper limit value of the 10 kilovolt bus voltage exceeds the range N;
if the range is exceeded, the step D7 is carried out; if not, go to step D5;
wherein N belongs to [ N1, N2], N is a 10 kilovolt bus voltage qualified range specified by a power system, N1 is a lower limit value of the qualified range, and N2 is an upper limit value of the qualified range;
d5: the upper limit value of the 10 kilovolt bus is updated according to the formula
Then step D6 is entered;
wherein ,
is an updated upper limit value delta of the 10 kilovolt bus L The adjustment step length 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-in and the switching-out are not frequently carried out any more, the step D10 is entered; if frequent break-back still occurs, go to step D7;
d7: judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range or not, and judging whether the lower limit value of the voltage of the 35 kilovolt bus exceeds the range M or not;
if the range is exceeded, the step D8 is carried out; if not, updating n2, adding 1 on the basis of the current value of n2, and then entering the step D2;
wherein M belongs to [ M1, M2], M is a 35 kilovolt bus voltage qualified range 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: carrying out secondary judgment on whether the upper limit value of the 10 kilovolt bus is out of range or not, and judging whether the upper limit value of the 10 kilovolt bus is out of range N or not;
if the range is exceeded, the step D9 is carried out; if not, updating n1, adding 1 on the basis of the current value of n1, and then entering the step D5;
d9: judging that no proper voltage limit value exists under the capacitor, and indicating that no proper voltage limit value exists in the plant station under the capacitor specification, optimizing the capacitor capacity and the group number, and determining the optimal compensation capacity and the optimal distribution mode;
d10: carrying out secondary judgment on whether the bus voltage exceeds the limit, and judging whether the upper limit value of the optimized 10kV bus voltage exceeds the range N and whether the lower limit value of the 35kV bus voltage exceeds the range M;
if either is out of range, go to step D9; if neither of the two are out of range, go to step D11;
d11: finishing the voltage limit adjustment, and determining the latest voltage limit values of the 10 kilovolt bus and the 35 kilovolt bus; then step D12 is entered;
d12: in an observation period not less than 24 hours, observing whether the frequent switching-on and switching-off phenomenon of the capacitor still occurs; if so, returning to the step D1; and if not, entering the step E.
9. The two-stage complementation based automatic voltage control system voltage limit optimization method according to claim 7 or 8, wherein: the adjustment step delta L and δH All use 0.1.
10. The method of claim 1, wherein the method comprises: the observation period is not less than 24 hours.
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