CN104967151A - Method and system for PMU (power management unit) distribution of electric power system and selection of generator by corresponding bus - Google Patents
Method and system for PMU (power management unit) distribution of electric power system and selection of generator by corresponding bus Download PDFInfo
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Abstract
The invention relates to a PMU (power management unit) distribution method for a power system, which comprises the following steps: setting a fault set for off-line simulation; performing off-line simulation on the to-be-detected fault buses by using a plurality of faults corresponding to the fault set to obtain simulated voltage values of the to-be-detected fault buses under each fault corresponding to the fault set; respectively calculating the weighted sum of the simulation voltage values of each bus to be detected under a plurality of faults corresponding to the fault set according to the fault set and the simulation voltage values; respectively calculating the transient voltage instability risk index values of the fault buses to be detected according to the weighted sum of the time when the transient voltage value of the power system is lower than the preset value, the simulation fault starting moment, the off-line simulation duration, the preset low voltage value, the preset high voltage value and the simulation voltage value; and selecting the fault bus to be detected as a PMU distribution point bus according to the transient voltage instability risk index value and the number of available PMUs. The PMU distribution method for the power system realizes reasonable configuration of the PMU and improves monitoring efficiency of the power system.
Description
Technical field
The present invention relates to technical field of power systems, particularly relate to a kind of electric power system PMU and to layout and corresponding bus chooses generator method and system.
Background technology
Electric power system is a kind of electrical energy production of being made up of links such as generating, power transformation, transmission of electricity, distribution and electricity consumptions and consume system.In electric power system, induction motor is main inductive load, and the ratio accounting for load increases increasingly.After electric power system is broken down, the demand sharp increase of the reactive power of induction motor, if the reactive power that in the receiving end AC system of transmission of electricity process, reactive power source exports can not satisfy the demands, falling of line voltage long period and higher magnitude can be caused, even continuous worseningly cause voltage collapse.In order to improve Enhancement of Transient Voltage Stability, need in time and the comprehensive voltage of critical busses in monitoring electric power system, and the idle deposit making full use of generator is to support the transient voltage of electric power system.
The method of existing detection electric power system median generatrix voltage, mainly arranges PMU to detect the voltage of bus on bus.Generally, due to the Limited Number of PMU, be therefore difficult to accomplish the completely considerable of whole electric power system, cause the monitoring efficiency of electric power system low, utilize the idle deposit of generator low to the efficiency realizing Transient Voltage Stability.
Summary of the invention
Based on this, be necessary for the problems referred to above, provide a kind of higher electric power system PMU of efficiency that monitors to layout and corresponding bus chooses generator method and system.
A kind of electric power system PMU points distributing method, comprises the steps:
Arrange the fault set that off-line simulation is used, described fault set comprises probable value corresponding to multiple faults of off-line simulation;
The multiple faults corresponding according to described fault set are treated detection failure bus and are carried out off-line simulation, obtain the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to described fault set;
According to described fault set and described emulation magnitude of voltage, calculate the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that described fault set is corresponding respectively;
According to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and described emulation magnitude of voltage, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively;
Choose fault bus to be detected according to described transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
A kind of electric power system PMU system for arranging gravity points, comprising:
Fault verification module, for arranging off-line simulation fault set used, described fault set comprises probable value corresponding to multiple faults of off-line simulation;
Off-line simulation module, the multiple faults for utilizing described fault set corresponding are treated detection failure bus and are carried out off-line simulation, obtain the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to described fault set;
Voltage summation module, for according to described fault set and described emulation magnitude of voltage, calculates the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that described fault set is corresponding respectively;
Risk supervision module, for according to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and described emulation magnitude of voltage, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively;
Layouting and choose module, for choosing fault bus to be detected according to described transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
Above-mentioned electric power system PMU points distributing method and system, treat detection failure bus according to the fault set arranged and carry out off-line simulation, obtain the weighted sum of the emulation magnitude of voltage under each fault that off-line simulation obtains, according to the weighted sum of emulation magnitude of voltage, transient voltage value is lower than the time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value and preset high-pressure value obtain the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively, and choose fault bus to be detected according to transient voltage unstability risk indicator value and available PMU quantity and to layout bus as PMU, achieve the reasonable disposition of PMU, improve the monitoring efficiency to electric power system.
The corresponding bus of a kind of electric power system chooses generator method, comprises the steps:
Choose one of them fault in above-mentioned fault set, respectively off-line simulation carried out to each PMU above-mentioned bus of layouting, after detection simulation fault each generator to current PMU layout bus idle go out force value;
According to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus;
According to each generator, current PMU to be layouted the transient voltage enabling capabilities desired value of bus, choose current PMU and to layout the support generator of bus.
The corresponding bus of a kind of electric power system chooses generator system, comprising:
Idle detection module, for choosing one of them fault in above-mentioned fault set, carries out off-line simulation to each above-mentioned PMU bus of layouting respectively, after detection simulation fault each generator to current PMU layout bus idle go out force value;
Support detection module, for according to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus;
Module chosen by generator, for the transient voltage enabling capabilities desired value of bus of layouting to current PMU according to each generator, chooses current PMU and to layout the support generator of bus.
The corresponding bus of above-mentioned electric power system chooses generator method and system, by adopting a fault in fault set, off-line simulation is carried out to PMU bus of layouting, obtain each generator to layout to current PMU to each generator the transient voltage enabling capabilities desired value of bus, and then the transient voltage enabling capabilities desired value of bus of current PMU being layouted according to each generator, choose current PMU to layout the support generator of bus, effectively can improve corresponding PMU to layout the Enhancement of Transient Voltage Stability of bus, thus improve the Enhancement of Transient Voltage Stability of electric power system.
Accompanying drawing explanation
Fig. 1 is the flow chart of electric power system PMU points distributing method in one embodiment of the invention;
Fig. 2 chooses fault bus to be detected according to Transient Instability risk indicator value and available PMU quantity to layout as PMU the particular flow sheet of bus;
Fig. 3 is the flow chart that in one embodiment of the invention, the corresponding bus of electric power system chooses generator method;
Fig. 4 is the module map of electric power system PMU system for arranging gravity points in one embodiment of the invention;
Fig. 5 chooses the concrete unit figure of module for layouting shown in Fig. 4 in an embodiment;
Fig. 6 is the module map that in one embodiment of the invention, the corresponding bus of electric power system chooses generator system;
Fig. 7 is the flow chart of electric power system PMU points distributing method in an application examples;
Fig. 8 is the flow chart that in application examples, the corresponding bus of electric power system chooses generator method;
Fig. 9 layouts in conjunction with PMU in application examples and corresponding bus chooses the schematic flow sheet of the considerable and controlled points distributing method of Enhancement of Transient Voltage Stability wide area that generator obtains.
Embodiment
With reference to figure 1, electric power system PMU points distributing method in one embodiment of the invention, comprises the steps that S110 is to step S190.
S110: arrange the fault set that off-line simulation is used, fault set comprises probable value corresponding to multiple faults of off-line simulation.
In the present embodiment, for the actual conditions setting fault set of studied electric power system, M fault can be comprised in fault set, remember that the probability of occurrence of each fault is
wherein i=1,2 ..., M, meets
S130: the multiple faults utilizing fault set corresponding are treated detection failure bus and carried out off-line simulation, obtains the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to fault set.
Fault bus to be detected is the bus needing detected voltage in electric power system, by configuring the voltage that PMU detects this bus on fault bus to be detected.Fault bus to be detected selected in the present embodiment comprises non-pure transmission nodes all in electric power system.
Adopt any one fault in fault set to treat detection failure bus when carrying out off-line simulation, the magnitude of voltage of each bar fault bus to be detected under fault can be obtained.Therefore, by adopting each fault in fault set to emulate respectively, the emulation magnitude of voltage of each bar bus under each fault can be obtained.Be provided with N bar fault bus to be detected, adopt each fault in fault set to treat detection failure bus and emulate, the voltage curve of record jth bar bus under i-th fault.
S150: according to fault set and emulation magnitude of voltage, calculate the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that fault set is corresponding respectively.
Wherein in an embodiment, step S150 comprises formula:
In formula,
for the probable value of i-th fault in fault set, V
i,jfor the magnitude of voltage of jth bar bus under i-th fault, V
jfor the weighted sum of the emulation magnitude of voltage of jth bar bus under multiple faults that fault set is corresponding.
S170: according to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and emulation magnitude of voltage, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively.
Wherein in an embodiment, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected in step S170 respectively, comprise formula:
υ
j＝D
j+S
j；
In formula, V
jfor emulating the weighted sum of voltage, T
jfor V
jlower than the time of preset value, t
0for simulated fault start time, T is off-line simulation duration, D
jfor INSTABILITY CRITERION value, S
jfor voltage over standard value, υ
jfor transient voltage unstability risk indicator value.
In the present embodiment, preset value is set to 0.8p.u..Power industry standard DL/T 1234-2013 regulation transient voltage can not be got back to more than 0.8p.u. and be transient voltage unstability in 10s.T
jbe less than 10s, represent Transient Voltage Stability, T
jbe more than or equal to 10s, represent transient voltage unstability, therefore, D
jvalue can react transient voltage whether unstability.
In the present embodiment, pre-set low pressure value is 0.9p.u., and preset high-pressure value is 1.1p.u., S
jbe made up of two parts area, the area that to be voltage curve respectively surround lower than part and the horizontal line 0.9p.u. of 0.9p.u., and the area that voltage curve surrounds higher than part and the horizontal line 1.1p.u. of 1.1p.u..Therefore, S
jsize can be reflected in the fault simulation time voltage lower than pre-set low pressure value or the situation exceeding preset high-pressure value.When Voltage Drop is more serious or overshoot is larger, S
jalso larger, illustrate that Enhancement of Transient Voltage Stability is poorer, therefore the Transient Voltage Stability risk of the bus that transient voltage unstability risk indicator value is larger is larger.
S190: choose fault bus to be detected according to transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
Wherein in an embodiment, comprise step S191 to step S195 with reference to figure 2, step S190.
S191: be worth descending order according to transient voltage unstability risk indicator and choose corresponding fault bus to be detected, obtain bus collection of layouting.Wherein, the quantity of the bus to be detected that bus of layouting is concentrated is equal with available PMU quantity.
S195: choose the fault bus to be detected that bus of layouting concentrates and to layout bus as PMU.
Transient voltage unstability risk indicator value larger explanation transient voltage unstability risk is more serious, size according to transient voltage unstability risk indicator value selects fault bus to be detected, to layout bus as PMU, pay the utmost attention to and configure PMU on the bus that transient voltage unstability risk indicator value is large, the bus that Transient Voltage Stability in electrical network is had a big risk can be observed, realize the controlled of Transient Voltage Stability problem, improve the efficiency of stable transient voltage.
Wherein in an embodiment, continue with reference to figure 2, after step S191, before selecting step S195, also comprise:
S192: if bus of layouting is concentrated there is electrical distance between two or more fault bus to be detected in predeterminable range, then choose the to be detected fault bus of electrical distance in predeterminable range as screening bus collection, mark each screening bus to concentrate transient voltage unstability risk indicator to be worth maximum fault bus to be detected and bus of layouting to concentrate the fault bus to be detected not belonging to screening bus collection, obtain number of labels.
S193: according to the descending order of transient voltage unstability risk indicator value, marks the fault bus to be detected of specified quantity from the fault bus to be detected outside bus collection of layouting.Wherein, specified quantity is available PMU quantity and the difference of marker number.
S194: the fault bus to be detected of mark is set to the bus collection of layouting after renewal.
When two or more fault bus electrical distance to be detected is nearer, the transient characterisitics of voltage are also comparatively close, can select only wherein transient voltage unstability risk indicator be worth on maximum bus PMU be installed, neither affect the ornamental of Transient Voltage Stability, can cost be reduced again.
Above-mentioned electric power system PMU points distributing method, treat detection failure bus according to the fault set arranged and carry out off-line simulation, obtain the weighted sum of the emulation magnitude of voltage under each fault that off-line simulation obtains, according to the weighted sum of emulation magnitude of voltage, transient voltage value is lower than the time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value and preset high-pressure value obtain the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively, and choose fault bus to be detected according to transient voltage unstability risk indicator value and available PMU quantity and to layout bus as PMU, achieve the reasonable disposition of PMU, improve the monitoring efficiency to electric power system.
With reference to figure 3, in one embodiment of the invention, the corresponding bus of electric power system chooses generator method, comprises the steps that S210 is to step S250.
S210: choose one of them fault in above-mentioned fault set, carries out off-line simulation to each PMU bus of layouting respectively, after detection simulation fault each generator to current PMU layout bus idle go out force value.
S230: according to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus.
Wherein in an embodiment, step S230 can be: judge respectively each generator idle go out the recruitment of force value whether be more than or equal to 20%.If so, then judge that generator layouts the transient voltage enabling capabilities desired value of bus as 1 to current PMU, otherwise, judge that generator layouts the transient voltage enabling capabilities desired value of bus as 0 to current PMU.Be appreciated that in other embodiments, also can arrange other increases value as pre-conditioned judgement.
S250: the transient voltage enabling capabilities desired value of bus of layouting to current PMU according to each generator, chooses current PMU and to layout the support generator of bus.
Wherein in an embodiment, step S250 is that choosing the layout transient voltage enabling capabilities desired value of bus of current PMU is the generator of 1, the support generator of bus of layouting as current PMU.
In the present embodiment, be the generator of 1 to the layout transient voltage enabling capabilities desired value of bus of current PMU, represent generator idle go out the recruitment of force value be more than or equal to 20%, idle the exerting oneself of generator enlarges markedly, think that this generator can sense that this PMU layouts the Voltage Drop of bus, can play a supporting role to the layout voltage of bus of this PMU.Obtain each generator successively to layout to each bar PMU the transient voltage enabling capabilities desired value of bus, the generator that the voltage that can layout bus to each bar PMU is played a supporting role can be found out respectively.
The corresponding bus of above-mentioned electric power system chooses generator method, by adopting a fault in fault set, off-line simulation is carried out to PMU bus of layouting, obtain each generator to layout to current PMU to each generator the transient voltage enabling capabilities desired value of bus, and then the transient voltage enabling capabilities desired value of bus of current PMU being layouted according to each generator, choose current PMU to layout the support generator of bus, effectively can improve corresponding PMU to layout the Enhancement of Transient Voltage Stability of bus, thus improve the Enhancement of Transient Voltage Stability of electric power system.
With reference to figure 4, electric power system PMU system for arranging gravity points in one embodiment of the invention, comprises fault verification module 110, off-line simulation module 130, voltage summation module 150, risk supervision module 170 and layouts and choose module 190.
Fault verification module 110 is for arranging off-line simulation fault set used, and fault set comprises probable value corresponding to multiple faults of off-line simulation.
In the present embodiment, for the actual conditions setting fault set of studied electric power system, M fault can be comprised in fault set, remember that the probability of occurrence of each fault is
wherein i=1,2 ..., M, meets
Off-line simulation module 130 is treated detection failure bus for the multiple faults utilizing fault set corresponding and is carried out off-line simulation, obtains the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to fault set.
Fault bus to be detected is the bus needing detected voltage in electric power system, by configuring the voltage that PMU detects this bus on fault bus to be detected.Fault bus to be detected selected in the present embodiment comprises non-pure transmission nodes all in electric power system.
Adopt any one fault in fault set to treat detection failure bus when carrying out off-line simulation, the magnitude of voltage of each bar fault bus to be detected under fault can be obtained.Therefore, by adopting each fault in fault set to emulate respectively, the emulation magnitude of voltage of each bar bus under each fault can be obtained.Be provided with N bar fault bus to be detected, adopt each fault in fault set to treat detection failure bus and emulate, the voltage curve of record jth bar bus under i-th fault.
Voltage summation module 150, for according to fault set and emulation magnitude of voltage, calculates the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that fault set is corresponding respectively.
Wherein in an embodiment, voltage summation module obtains the weighted sum of the emulation magnitude of voltage of fault bus to be detected under multiple faults that fault set is corresponding according to following formula:
In formula,
for the probable value of i-th fault in fault set, V
i,jfor the magnitude of voltage of jth bar bus under i-th fault, V
jfor the weighted sum of the emulation magnitude of voltage of jth bar bus under multiple faults that fault set is corresponding.
Risk supervision module 170, for according to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and emulation magnitude of voltage, calculates the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively.
Wherein in an embodiment, risk supervision module 170 is according to formula:
υ
j＝D
j+S
j；
Calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively.
In formula, V
jfor emulating the weighted sum of voltage, T
jfor V
jlower than the time of preset value, t
0for simulated fault start time, T is off-line simulation duration, D
jfor INSTABILITY CRITERION value, S
jfor voltage over standard value, υ
jfor transient voltage unstability risk indicator value.
In the present embodiment, preset value is set to 0.8p.u..Power industry standard DL/T 1234-2013 regulation transient voltage can not be got back to more than 0.8p.u. and be transient voltage unstability in 10s.T
jbe less than 10s, represent Transient Voltage Stability, T
jbe more than or equal to 10s, represent transient voltage unstability, therefore, D
jvalue can react transient voltage whether unstability.
In the present embodiment, pre-set low pressure value is 0.9p.u., and preset high-pressure value is 1.1p.u., S
jbe made up of two parts area, the area that to be voltage curve respectively surround lower than part and the horizontal line 0.9p.u. of 0.9p.u., and the area that voltage curve surrounds higher than part and the horizontal line 1.1p.u. of 1.1p.u..Therefore, S
jsize can be reflected in the fault simulation time voltage lower than pre-set low pressure value or the situation exceeding preset high-pressure value.When Voltage Drop is more serious or overshoot is larger, S
jalso larger, illustrate that Enhancement of Transient Voltage Stability is poorer, therefore the Transient Voltage Stability risk of the bus that transient voltage unstability risk indicator value is larger is larger.
Layout and choose module 190 for choosing fault bus to be detected according to transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
Wherein in an embodiment, with reference to figure 5, layout and choose module 190 and comprise:
Bus selected cell 191, for choosing corresponding fault bus to be detected according to the descending order of transient voltage unstability risk indicator value, obtains bus collection of layouting.Wherein, the quantity of the bus to be detected that bus of layouting is concentrated is equal with available PMU quantity.
Layouting determining unit 196, to layout bus as PMU for choosing fault bus to be detected that bus of layouting concentrates.
Transient voltage unstability risk indicator value larger explanation transient voltage unstability risk is more serious, size according to transient voltage unstability risk indicator value selects fault bus to be detected, to layout bus as PMU, pay the utmost attention to and configure PMU on the bus that transient voltage unstability risk indicator value is large, the bus that Transient Voltage Stability in electrical network is had a big risk can be observed, realize the controlled of Transient Voltage Stability problem, improve the efficiency of stable transient voltage.
Wherein in an embodiment, continue with reference to figure 5, layout and choose module 190 and also comprise:
Electrical distance judging unit 192, concentrates whether there is electrical distance between two or more fault bus to be detected in predeterminable range for the bus that judges to layout.
First bus indexing unit 193, for concentrate at bus of layouting exist electrical distance between two or more fault bus to be detected in predeterminable range time, choose the to be detected fault bus of electrical distance in predeterminable range as screening bus collection, mark each screening bus to concentrate transient voltage unstability risk indicator to be worth maximum fault bus to be detected and bus of layouting to concentrate the fault bus to be detected not belonging to screening bus collection, obtain number of labels.
Second bus indexing unit 194, for the descending order according to transient voltage unstability risk indicator value, marks the fault bus to be detected of specified quantity from the fault bus to be detected outside bus collection of layouting.Wherein, specified quantity is available PMU quantity and the difference of marker number.
Data updating unit 195, for being set to the bus collection of layouting after renewal by the fault bus to be detected of mark.
When two or more fault bus electrical distance to be detected is nearer, the transient characterisitics of voltage are also comparatively close, can select only wherein transient voltage unstability risk indicator be worth on maximum bus PMU be installed, neither affect the ornamental of Transient Voltage Stability, can cost be reduced again.
Above-mentioned electric power system PMU system for arranging gravity points, off-line simulation module 130 is treated detection failure bus according to the fault set that fault verification module 110 is arranged and is carried out off-line simulation, voltage summation module 150 obtains the weighted sum of the emulation magnitude of voltage under each fault that off-line simulation obtains, risk supervision module 170 is according to the weighted sum of emulation magnitude of voltage, transient voltage value is lower than the time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value and preset high-pressure value obtain the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively, layout and choose module 190 and choose fault bus to be detected according to transient voltage unstability risk indicator value and available PMU quantity and to layout bus as PMU, achieve the reasonable disposition of PMU, improve the monitoring efficiency to electric power system.
With reference to figure 6, in one embodiment of the invention, the corresponding bus of electric power system chooses generator system, comprises idle detection module 210, support detection module 230 and generator and chooses module 250.
Idle detection module 210, for choosing one of them fault in above-mentioned fault set, carries out off-line simulation to each PMU bus of layouting respectively, after detection simulation fault each generator to current PMU layout bus idle go out force value.
Support detection module 230 for according to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus.
Wherein in an embodiment, support detection module 230 specifically for judge respectively each generator idle go out the recruitment of force value whether be more than or equal to 20%.If so, then judge that generator layouts the transient voltage enabling capabilities desired value of bus as 1 to current PMU, otherwise, judge that generator layouts the transient voltage enabling capabilities desired value of bus as 0 to current PMU.Be appreciated that in other embodiments, also can arrange other increases value as pre-conditioned judgement.
The transient voltage enabling capabilities desired value of module 250 for bus of layouting to current PMU according to each generator chosen by generator, chooses current PMU and to layout the support generator of bus.
Wherein in an embodiment, it is the generator of 1 that generator chooses module 250 specifically for choosing the layout transient voltage enabling capabilities desired value of bus of current PMU, the support generator of bus of layouting as current PMU.
In the present embodiment, be the generator of 1 to the layout transient voltage enabling capabilities desired value of bus of current PMU, represent generator idle go out the recruitment of force value be more than or equal to 20%, idle the exerting oneself of generator enlarges markedly, think that this generator can sense that this PMU layouts the Voltage Drop of bus, can play a supporting role to the layout voltage of bus of this PMU.Obtain each generator successively to layout to each bar PMU the transient voltage enabling capabilities desired value of bus, the generator that the voltage that can layout bus to each bar PMU is played a supporting role can be found out respectively.
The corresponding bus of above-mentioned electric power system chooses generator system, in fault set fault is adopted to carry out off-line simulation to PMU bus of layouting by idle detection module 210, after detection simulation fault each generator to current PMU layout bus idle go out force value, support detection module 230 according to idle go out the situation of change of force value, obtain each generator to layout to current PMU the transient voltage enabling capabilities desired value of bus, generator is chosen module 250 and to be layouted to current PMU according to each generator the transient voltage enabling capabilities desired value of bus, choose current PMU to layout the support generator of bus, effectively can improve corresponding PMU to layout the Enhancement of Transient Voltage Stability of bus, thus improve the Enhancement of Transient Voltage Stability of electric power system.
Choose generator method to apply the corresponding bus of above-mentioned electric power system PMU points distributing method and electric power system, in conjunction with PMU layout and choosing of generator can obtain the considerable and controlled points distributing method of Enhancement of Transient Voltage Stability wide area.Should in use-case, the flow chart of electric power system PMU points distributing method as shown in Figure 7, is provided with M fault.Complete after PMU layouts, also need to carry out generator and choose, as shown in Figure 8, if configure PMU on K bar PMU layouts bus, bus of being layouted by this K bar PMU is designated as B
1, B
2b
k, L platform generators all in the receiving-end system of electric power system is denoted as G
1, G
2... G
l.From B
1start, to layout bus B at kth bar PMU
kthe fault of a certain type in fault set is set, observes l generator reactive after fault and to exert oneself situation of change, successively the off-line simulation of the type fault is carried out to K bar PMU bus of layouting, select each PMU and to layout the support generator of bus.
With reference to figure 9, for should the considerable and controlled points distributing method of Enhancement of Transient Voltage Stability wide area in use-case, when a failure occurs, carry out closed-loop control.Such as, when a certain PMU layout the voltage of bus reduce because of fault time, increase this PMU and to layout the excitation system voltage reference value of support generator of bus.When generator normally runs, excitation system voltage reference value generally changes near 1p.u., after breaking down, can add that on former excitation system voltage reference value a size is the step signal of a, the desirable 0.1p.u. of a, after the voltage resume of electric power system, excitation system voltage reference value gets back to initial condition again.When PMU layouts busbar fault, increase the excitation system voltage reference value of corresponding support generator, the set end voltage supporting generator can be increased, and make exciting voltage maintain the longer time in high value, thus export more dynamic reactive, improve the Enhancement of Transient Voltage Stability of system.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an electric power system PMU points distributing method, is characterized in that, comprises the steps:
Arrange the fault set that off-line simulation is used, described fault set comprises probable value corresponding to multiple faults of off-line simulation;
The multiple faults utilizing described fault set corresponding are treated detection failure bus and are carried out off-line simulation, obtain the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to described fault set;
According to described fault set and described emulation magnitude of voltage, calculate the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that described fault set is corresponding respectively;
According to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and described emulation magnitude of voltage, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively;
Choose fault bus to be detected according to described transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
2. electric power system PMU points distributing method according to claim 1, is characterized in that,
The described transient voltage unstability risk indicator value calculating each bar fault bus to be detected respectively, comprises formula:
υ
j＝D
j+S
j；
In formula, V
jfor the weighted sum of described emulation voltage, T
jfor V
jlower than the time of preset value, t
0for described simulated fault start time, T is described off-line simulation duration, D
jfor INSTABILITY CRITERION value, S
jfor voltage over standard value, υ
jfor described transient voltage unstability risk indicator value.
3. electric power system PMU points distributing method according to claim 1, is characterized in that, describedly chooses fault bus to be detected according to described transient voltage unstability risk indicator value and available PMU quantity, to layout bus, comprising as PMU:
Be worth descending order according to described transient voltage unstability risk indicator and choose corresponding fault bus to be detected, obtain bus collection of layouting, wherein, described in the layout quantity of bus to be detected that bus concentrates equal with available PMU quantity;
The fault bus to be detected that bus of layouting described in choosing is concentrated to be layouted bus as described PMU.
4. electric power system PMU points distributing method according to claim 3, it is characterized in that, describedly be worth descending order according to described transient voltage unstability risk indicator and choose corresponding fault bus to be detected, obtain layouting after bus collection, the fault bus to be detected that bus of layouting described in choosing is concentrated is layouted before bus as described PMU, also comprises:
If described in bus of layouting concentrate and there is electrical distance between two or more fault bus to be detected in predeterminable range;
Then choose the to be detected fault bus of electrical distance in predeterminable range as screening bus collection, mark each screening bus concentrate described transient voltage unstability risk indicator be worth maximum fault bus to be detected and described in bus of layouting concentrate the fault bus to be detected not belonging to described screening bus collection, obtain number of labels;
According to the descending order of described transient voltage unstability risk indicator value, the fault bus to be detected of specified quantity is marked from the fault bus to be detected outside described bus collection of layouting, wherein, described specified quantity is described available PMU quantity and the difference of marker number;
The fault bus to be detected of mark is set to the bus collection of layouting after renewal.
5. the corresponding bus of electric power system chooses a generator method, it is characterized in that, comprises the steps:
Choose one of them fault in the fault set described in any one of claim 1-4, respectively off-line simulation carried out to each PMU described bus of layouting, after detection simulation fault each generator to current PMU layout bus idle go out force value;
According to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus;
According to each generator, current PMU to be layouted the transient voltage enabling capabilities desired value of bus, choose current PMU and to layout the support generator of bus.
6. an electric power system PMU system for arranging gravity points, is characterized in that, comprising:
Fault verification module, for arranging off-line simulation fault set used, described fault set comprises probable value corresponding to multiple faults of off-line simulation;
Off-line simulation module, the multiple faults for utilizing described fault set corresponding are treated detection failure bus and are carried out off-line simulation, obtain the emulation magnitude of voltage of each bar fault bus to be detected under each fault corresponding to described fault set;
Voltage summation module, for according to described fault set and described emulation magnitude of voltage, calculates the weighted sum of the emulation magnitude of voltage of each bar fault bus to be detected under multiple faults that described fault set is corresponding respectively;
Risk supervision module, for according to the transient voltage value of the electric power system weighted sum lower than time of preset value, simulated fault start time, off-line simulation duration, pre-set low pressure value, preset high-pressure value and described emulation magnitude of voltage, calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively;
Layouting and choose module, for choosing fault bus to be detected according to described transient voltage unstability risk indicator value and available PMU quantity, to layout bus as PMU.
7. electric power system PMU system for arranging gravity points according to claim 6, is characterized in that, described risk supervision module is according to formula:
υ
j＝D
j+S
j；
Calculate the transient voltage unstability risk indicator value of each bar fault bus to be detected respectively;
In formula, V
jfor the weighted sum of described emulation voltage, T
jfor V
jlower than the time of preset value, t
0for described simulated fault start time, T is described off-line simulation duration, D
jfor INSTABILITY CRITERION value, S
jfor voltage over standard value, υ
jfor described transient voltage unstability risk indicator value.
8. electric power system PMU system for arranging gravity points according to claim 6, is characterized in that, described in layout and choose module and comprise:
Bus selected cell, for choosing corresponding fault bus to be detected according to the descending order of described transient voltage unstability risk indicator value, obtain bus collection of layouting, wherein, described in the layout quantity of bus to be detected that bus concentrates equal with available PMU quantity;
Layout determining unit, the fault bus to be detected concentrated for bus of layouting described in choosing to be layouted bus as described PMU.
9. electric power system PMU system for arranging gravity points according to claim 8, is characterized in that, described in layout and choose module and also comprise:
Electrical distance judging unit, concentrates whether there is electrical distance between two or more fault bus to be detected in predeterminable range for bus of layouting described in judging;
First bus indexing unit, for concentrate at described bus of layouting exist electrical distance between two or more fault bus to be detected in predeterminable range time, choose the to be detected fault bus of electrical distance in predeterminable range as screening bus collection, mark each screening bus concentrate described transient voltage unstability risk indicator be worth maximum fault bus to be detected and described in bus of layouting concentrate the fault bus to be detected not belonging to described screening bus collection, obtain number of labels;
Second bus indexing unit, for the descending order according to described transient voltage unstability risk indicator value, the fault bus to be detected of specified quantity is marked from the fault bus to be detected outside described bus collection of layouting, wherein, described specified quantity is described available PMU quantity and the difference of marker number;
Data updating unit, for being set to the bus collection of layouting after renewal by the fault bus to be detected of mark.
10. the corresponding bus of electric power system chooses a generator system, it is characterized in that, comprising:
Idle detection module, for choosing one of them fault in the fault set described in any one of claim 6-9, respectively off-line simulation is carried out to each PMU described bus of layouting, after detection simulation fault each generator to current PMU layout bus idle go out force value;
Support detection module, for according to each generator idle go out the situation of change of force value, obtain each generator and current PMU to be layouted the transient voltage enabling capabilities desired value of bus;
Module chosen by generator, for the transient voltage enabling capabilities desired value of bus of layouting to current PMU according to each generator, chooses current PMU and to layout the support generator of bus.
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| CN106100003A (en) * | 2016-08-03 | 2016-11-09 | 广东电网有限责任公司电力调度控制中心 | The voltage security assessments method and system of power system |
| CN106159940A (en) * | 2016-07-01 | 2016-11-23 | 华北电力大学 | PMU optimum points distributing method based on network load specificity analysis |
| EP3648281A1 (en) * | 2018-10-30 | 2020-05-06 | Siemens Aktiengesellschaft | Method and apparatus for determining events in an electrical power grid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106159940A (en) * | 2016-07-01 | 2016-11-23 | 华北电力大学 | PMU optimum points distributing method based on network load specificity analysis |
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| CN106100003A (en) * | 2016-08-03 | 2016-11-09 | 广东电网有限责任公司电力调度控制中心 | The voltage security assessments method and system of power system |
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| EP3648281A1 (en) * | 2018-10-30 | 2020-05-06 | Siemens Aktiengesellschaft | Method and apparatus for determining events in an electrical power grid |
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| CN104967151B (en) | 2017-08-11 |
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Effective date of registration: 20210729 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Patentee after: TSINGHUA University Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: China South Power Grid International Co.,Ltd. Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID Patentee before: TSINGHUA University |