CN103178522B - Network voltage stability and continuity load flow calculation method considering characteristics of distributed generation - Google Patents
Network voltage stability and continuity load flow calculation method considering characteristics of distributed generation Download PDFInfo
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Abstract
The invention discloses a network voltage stability and continuity load flow calculation method considering characteristics of distributed generation. The method mainly comprises the following steps of: initializing a load flow calculation process of an existing electric power system by utilizing a corresponding load flow calculation model of the electric power system according to the characteristics of the distributed generation of the existing electric power system; predicting existing calculation steps in the load flow calculation process of the existing electric power system according to the obtained load flow calculation initial value of the existing electric power system; carrying out local correction on the obtained existing predicted load flow result by utilizing a local correction method; and returning the prediction step till all calculation steps of the load flow calculation process of the existing electric power system are completely finished. According to the network voltage stability and continuity load flow calculation method considering the characteristics of the distributed generation, disclosed by the invention, the defects that the stability of the quiescent voltage is poor, the access capacity of the distributed generation is small, the difficulty of load flow calculation is large and the like in the prior art can be overcome, and the advantages that the stability of the quiescent voltage is good, the access capacity of the distributed generation is large and the difficulty of load flow calculation is low are achieved.
Description
Technical field
The present invention relates to continuous tide computational methods technical field, particularly, relate to the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic.
Background technology
Regulation according in " guiding rules of power system safety and stability " that country promulgates: for keeping the normal level of the stability normally run of electric power system and frequency, voltage, electric power system should have enough steady stability deposits and meritorious, reactive power reserve, and the regulating measure be necessary.In normal duty fluctuation with when regulating meritorious, reactive power flow, all spontaneous oscillation should not be there is.Tackling the main means of this problem is ask for Power System Total Transfer Capacity by static voltage stability limits, and determines the static reserve factor of electric power system.
At present, most widely used static electric voltage stability analysis method is Continuation Method, and it successfully overcomes conventional Load Flow and calculate in singular point problem by introducing continuity parameter, and then calculate the ability to transmit electricity of electric power system exactly.
The continuous increase of the access net capacity of distributed power source, will affect to power system steady state voltage stability, and this is also the key of the maximum access capacity of restriction distributed power source.Because distributed power source comprises polytype, there is the grid-connected inverters such as photovoltaic, energy storage type, also have the electric rotating machine such as gas electricity generator, wind-driven generator type.And different distributed power sources is in voltage protection etc., and also difference is different, traditional continuous power flow cannot be applicable to the static voltage stability analysis under distributed power source access.
Realizing in process of the present invention, inventor finds at least to exist in prior art the defect such as the little and Load flow calculation difficulty of static electric voltage stability difference, distributed power source access capacity is large.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic, to realize the advantage that static electric voltage stability is good, distributed power source access capacity large and Load flow calculation difficulty is little.
For achieving the above object, the technical solution used in the present invention is: the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic, mainly comprise:
The distributed power source characteristic of a, analysis current power system, the power flow algorithm of corresponding electric power system is adopted according to the distributed power source characteristic of current power system, initialization is carried out to the Load flow calculation process of current power system, obtains the Load flow calculation initial value of current power system;
B, power flow algorithm according to current power system, utilize the Load flow calculation initial value of step a gained current power system, predict the current calculation procedure in the Load flow calculation process of current power system, obtain current predictive trend solution;
C, employing partial correction method, carry out partial correction to step b gained current predictive trend solution, obtain current real trend solution;
D, return step b, until all calculation procedures in the Load flow calculation process of current power system all complete.
Further, in step a, the described distributed power source characteristic according to current power system adopts the operation of the power flow algorithm of corresponding electric power system, specifically comprises:
If the distributed power source characteristic of current power system is inverse distributed power, then the power flow algorithm of current power system adopts PQ Controlling model;
If the distributed power source characteristic of current power system is electric rotating type distributed power source, then the power flow algorithm of current power system adopts the constant model of Eq.
Further, in step a, the described Load flow calculation process to current power system carries out initialized operation, specifically comprises:
A1, from the distributed power source characteristic analyzing gained current power system, choose any one element and carry out parametrization, obtain the initial continuity parameter in the Load flow calculation process of current power system;
A2, according to the initial continuity parameter of step a1 gained, the initial tracking direction in the Load flow calculation process of setting current power system.
Further, in step a1, the distributed power source characteristic of described analysis gained current power system, comprises controling parameters or state vector.
Further, in stepb, the described operation predicted the current calculation procedure in the Load flow calculation process of current power system, specifically comprises:
B1, initially follow the trail of direction according to step a2 gained, calculate the tangent vector of the current calculation procedure in the Load flow calculation process of current power system;
B2, from step b1 gained tangent vector, choose the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system;
B3, according to step b2 gained continuity parameter, determine the current calculation procedure in the Load flow calculation process of current power system next step follow the trail of direction;
B4, according to step b3 gained next step follow the trail of direction, step size controlling is carried out to the current calculation procedure in the Load flow calculation process of current power system.
Further, in step b2, the described operation choosing the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system from step b1 gained tangent vector, specifically comprises:
From step b1 gained tangent vector, select the amount that current change is maximum, as the operation of the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system.
Further, in step b4, the described operation current calculation procedure in the Load flow calculation process of current power system being carried out to step size controlling, specifically comprises:
B41, conveniently step size control method, calculate the conventional step-length of the current calculation procedure in the Load flow calculation process of current power system;
B42, distributed power source protective feature according to current power system, calculate the step-size estimation value of the current calculation procedure in the Load flow calculation process of current power system;
B43, conventional for step b41 gained step-length and step b42 gained step-size estimation value to be compared, to choose in the two smaller value person as the final step-length of the current calculation procedure calculated in the Load flow calculation process of current power system;
B44, by final for step b43 gained step-length, the former power flow equation substituted in the Load flow calculation process of current power system calculates, and obtains the prediction trend solution of the current calculation procedure in the Load flow calculation process of current power system, i.e. current predictive trend solution.
Further, in step b41, the operation of the conventional step-length of the current calculation procedure in the Load flow calculation process of described calculating current power system, specifically comprises:
By constructing the method for power function, calculate the conventional step-length of the current calculation procedure in the Load flow calculation process of current power system.
The Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic of various embodiments of the present invention, owing to mainly comprising: the power flow algorithm adopting corresponding electric power system according to the distributed power source characteristic of current power system, initialization is carried out to the Load flow calculation process of current power system; According to the Load flow calculation initial value of gained current power system, the current calculation procedure in the Load flow calculation process of current power system is predicted; Adopt partial correction method, partial correction is carried out to gained current predictive trend solution; Return prediction steps, until all calculation procedures in the Load flow calculation process of current power system all complete; From distributed power source characteristic, can determine continuous tide calculating parameter, be combined by traditional step size computation method with the step-length method of excising containing distributed power source, line correlation of going forward side by side calculates, and finally utilizes partial correction method to ensure the accuracy of result of calculation; Thus the defect that in prior art, static electric voltage stability is poor, distributed power source access capacity is little and Load flow calculation difficulty is large can be overcome, to realize the advantage that static electric voltage stability is good, distributed power source access capacity large and Load flow calculation difficulty is little.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the tangent line predicted method schematic diagram that Network Voltage Stability continuous tide computational methods that the present invention takes into account distributed power source characteristic adopt in forecasting process;
Fig. 2 is the constant-voltage step-length decline control methods schematic diagram that Network Voltage Stability continuous tide computational methods that the present invention takes into account distributed power source characteristic adopt in compensation calculation link;
The partial correction schematic diagram that the Network Voltage Stability continuous tide computational methods that Fig. 3 takes into account distributed power source characteristic for the present invention adopt at correction link;
Fig. 4 is the schematic flow sheet that the present invention takes into account the Network Voltage Stability continuous tide computational methods of distributed power source characteristic.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
The problem of the static voltage stability analysis under distributed power source access cannot be applicable in order to solve traditional continuous power flow, according to the embodiment of the present invention, provide the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic, can from distributed power source characteristic, determine continuous tide calculating parameter, combined with the step-length method of excising containing distributed power source by traditional step size computation method, line correlation of going forward side by side calculates, and finally utilizes partial correction method to ensure the accuracy of result of calculation.This takes into account the Network Voltage Stability continuous tide computational methods of distributed power source characteristic, can be applied in the electric power system ability to transmit electricity evaluation work containing distributed power source, the problem such as easily to disperse effectively to avoid former power flow equation.
As Figure 1-Figure 4, the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic of the present embodiment, carry out mainly through following technical measures the Network Voltage Stability continuous tide calculating that specific implementation takes into account distributed power source characteristic:
Step 100: calculate trend initial value, performs step 101;
In step 100, can analysis distribution formula power supply type, PQ Controlling model is adopted for inverse distributed power, the constant model of Eq is adopted for electric rotating type distributed power source, ensures that reactive power constraints problem appears in distributed power source;
Step 101: specify initial continuity parameter, direction is followed the trail of in setting, performs step 102;
In a step 101, by choosing continuity parameter, the object eliminating electric power system morbid state can be reached.Any one unit in controling parameters or state vector is selected usually to carry out parametrization;
Step 102: calculate tangent vector, performs step 103;
In a step 102, can, see Fig. 1, by known solutions, tangential method be adopted to find the prediction of the next approximate point separated;
Step 103: select continuity parameter, performs step 104;
In step 103, continuity parameter can being calculated according to selected parametric method, occurring morbid state, the amount that the current change of continuity Selecting parameter is maximum for avoiding former power flow equation;
Step 104: determine that next step follows the trail of direction, perform step 105 or step 106;
Step 105: conveniently step size control method, calculates conventional step-length, performs step 107;
In step 105, see Fig. 2, material calculation can be carried out by structure power function, thus reaches the object quickly through previous section in PV curve, and computational prediction initial value; To start to compare " smooth " part section thinner, and section is closeer near collapse point;
Step 106: according to distributed power source protective feature, material calculation, performs step 107;
In step 106, the predicted voltage of outlet bus controlling distributed power source equals its protection act voltage, show that distributed power source is autotomyed the step-size estimation value of action just;
Step 107: get a final step-length of conduct less in the two, and computational prediction value, perform step 108;
In step 107, rapid 105 and step 106 gained step-length are compared, chooses smaller value as actual step size;
Step 108: utilize local approach to correct predicted value, performs step 109;
In step 108, see Fig. 3, local calibration method can be adopted, ensure the real trend solution of each the step correspondence in continuous tide computational process;
Step 109: judge whether to meet and follow the trail of end condition, if so, then perform step 110; Otherwise, return step 102;
Step 110: complete calculating.
The Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic of above-described embodiment, have following characteristics:
(1) in distributed power source analytic process, consider distributed power source reactive power constraints problem, for the different qualities of inverse type and electric rotating type distributed power source, build and have chosen different computation models;
(2), in parameterized procedure, for reaching the object eliminating electric power system morbid state, from controling parameters or state vector, choosing unit usually carry out parametrization;
(3) in forecasting process, adopt tangential method on the basis of known solutions, carry out the prediction of the next approximate point separated, reduce iterations;
(4), in continuity parameter choose process, for avoiding former power flow equation to occur morbid state, select the amount that current change is maximum, as continuity calculating parameter;
(5) in step size controlling process, consider in original continuous tide computational methods, the step-length of the outlet bus protection action of material calculation and distributed power source is carried out by structure power function, choose both smaller values as actual step size, achieve the quick calculating containing distributed power source electrical network continuous tide;
(6) in correction link, adopt local calibration method, ensure the real trend solution of each the step correspondence in continuous tide computational process;
(7), by said process, finally complete the Network Voltage Stability continuous tide taking into account distributed power source characteristic and calculate.
In sum, the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic of various embodiments of the present invention, the characteristic comprised for inverse type and electric rotating type distributed power source builds and chooses different computation models, from controling parameters or state vector, choose unit usually carry out parametrization, tangential method is adopted to seek the prediction of the next approximate point separated by known solutions, the parameter selecting current change maximum is as continuity calculating parameter, consider the step size computation of the outlet bus protection action of structure power function and distributed power source, local calibration method is adopted to ensure each step continuous tide result of calculation, and by Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic that above-mentioned each step realizes.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. take into account the Network Voltage Stability continuous tide computational methods of distributed power source characteristic, it is characterized in that, mainly comprise:
The distributed power source characteristic of a, analysis current power system, the power flow algorithm of corresponding electric power system is adopted according to the distributed power source characteristic of current power system, initialization is carried out to the Load flow calculation process of current power system, obtains the Load flow calculation initial value of current power system;
B, power flow algorithm according to current power system, utilize the Load flow calculation initial value of step a gained current power system, predict the current calculation procedure in the Load flow calculation process of current power system, obtain current predictive trend solution;
C, employing partial correction method, carry out partial correction to step b gained current predictive trend solution, obtain current real trend solution;
D, return step b, until all calculation procedures in the Load flow calculation process of current power system all complete;
In step a, the described distributed power source characteristic according to current power system adopts the operation of the power flow algorithm of corresponding electric power system, specifically comprises:
If the distributed power source characteristic of current power system is inverse distributed power, then the power flow algorithm of current power system adopts PQ Controlling model;
If the distributed power source characteristic of current power system is electric rotating type distributed power source, then the power flow algorithm of current power system adopts the constant model of Eq;
In step a, the described Load flow calculation process to current power system carries out initialized operation, specifically comprises:
A1, from the distributed power source characteristic analyzing gained current power system, choose any one element and carry out parametrization, obtain the initial continuity parameter in the Load flow calculation process of current power system;
A2, according to the initial continuity parameter of step a1 gained, the initial tracking direction in the Load flow calculation process of setting current power system.
2. the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic according to claim 1, is characterized in that, in step a1, the distributed power source characteristic of described analysis gained current power system, comprises controling parameters or state vector.
3. the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic according to claim 1 and 2, it is characterized in that, in stepb, the described operation predicted the current calculation procedure in the Load flow calculation process of current power system, specifically comprises:
B1, initially follow the trail of direction according to step a2 gained, calculate the tangent vector of the current calculation procedure in the Load flow calculation process of current power system;
B2, from step b1 gained tangent vector, choose the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system;
B3, according to step b2 gained continuity parameter, determine the current calculation procedure in the Load flow calculation process of current power system next step follow the trail of direction;
B4, according to step b3 gained next step follow the trail of direction, step size controlling is carried out to the current calculation procedure in the Load flow calculation process of current power system.
4. the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic according to claim 3, it is characterized in that, in step b2, the described operation choosing the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system from step b1 gained tangent vector, specifically comprises:
From step b1 gained tangent vector, select the amount that current change is maximum, as the operation of the continuity parameter of the current calculation procedure in the Load flow calculation process of current power system.
5. the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic according to claim 3, it is characterized in that, in step b4, the described operation current calculation procedure in the Load flow calculation process of current power system being carried out to step size controlling, specifically comprises:
B41, conveniently step size control method, calculate the conventional step-length of the current calculation procedure in the Load flow calculation process of current power system;
B42, distributed power source protective feature according to current power system, calculate the step-size estimation value of the current calculation procedure in the Load flow calculation process of current power system;
B43, conventional for step b41 gained step-length and step b42 gained step-size estimation value to be compared, to choose in the two smaller value person as the final step-length of the current calculation procedure calculated in the Load flow calculation process of current power system;
B44, by final for step b43 gained step-length, the former power flow equation substituted in the Load flow calculation process of current power system calculates, and obtains the prediction trend solution of the current calculation procedure in the Load flow calculation process of current power system, i.e. current predictive trend solution.
6. the Network Voltage Stability continuous tide computational methods taking into account distributed power source characteristic according to claim 5, it is characterized in that, in step b41, the operation of the conventional step-length of the current calculation procedure in the Load flow calculation process of described calculating current power system, specifically comprises:
By constructing the method for power function, calculate the conventional step-length of the current calculation procedure in the Load flow calculation process of current power system.
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| CN103617361B (en) * | 2013-12-05 | 2015-09-09 | 江苏省电力公司 | A kind of 10kV power distribution network dynamic power flow on-line calculation method |
| CN104362627A (en) * | 2014-12-04 | 2015-02-18 | 国家电网公司 | Method for simplifying electric network based on power transfer distribution factor |
| CN104734148B (en) * | 2015-03-16 | 2017-03-22 | 河海大学 | Three-phrase power-distributing network continuation power flow analysis of distributed power supply |
| CN105137244B (en) * | 2015-09-10 | 2018-06-19 | 南方电网科学研究院有限责任公司 | It is used to implement the method and system that static voltage stability monitors in electric system |
| CN106374498B (en) * | 2016-11-22 | 2019-02-15 | 合肥工业大学 | A kind of micro-capacitance sensor tidal current computing method considering the control of secondary voltage frequency |
| CN112421617B (en) * | 2020-11-06 | 2022-12-30 | 广东电网有限责任公司东莞供电局 | Load flow calculation method and system of distributed power supply |
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