JP3134034B2 - Power system cooperative distributed control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of system voltage / reactive power control in a power system, and more particularly to a distributed control method of a power system using a voltage / reactive power control device.

[0002]

2. Description of the Related Art FIG. 5 shows a system voltage-reactive power control device (AQC), Mitsubishi Electric Technical Report Vol41, NO.
5 (1967) is a model system diagram showing a conventional power system control method using a voltage / reactive power control device, in which B1 to B6 are buses, L1 to L3 are loads, and LRT1 is a model system diagram. , LRT2 are on-load tap change transformers.

Further, T1 is a transformer, SC1 and SC2 are power capacitors, SR1 and SR2 are shunt reactors, S1
1 to S4 are transmission lines, I1 and I2 are communication lines for transmitting information, and VQC1 and VQC2 are voltage / reactive power control devices connected to the central feeding station K via the communication lines I1 and I2.

Next, the operation will be described. Central power station K
Is the load bus B of a substation without transmission loss or self-control capability.
Calculate the optimal power flow such that the voltage deviation (or other objective function) such as 4 is minimized under the constraints (voltage, reactive power, upper and lower limits of the manipulated variable), and calculate the voltage and reactive power passing through the transformer. Are set to the respective voltage / reactive power control devices VQC1 and VQC2 through the communication lines I1 and I2.

The setting of the voltage and the reactive power passing through the transformer is maintained by each of the voltage / reactive power controllers VQC1 and VQC.
2 are power capacitors SC1 and SC2 as shunting equipment and shunt reactor SR according to respective algorithms.
1, SR2 and on-load tap change transformers LRT1, LRT
2 is controlled.

[0006]

Since the conventional power system control method is implemented as described above, the central power station K
And each voltage and reactive power control device VQC1 and VQC in the system
It is necessary to set up a large-scale communication network between the central power station 2 and the network. Therefore, it is costly. There is a problem in that the voltage of a substation that is not installed, or even if it is installed, has reached the limit of its control capability, and has no self-control capability, cannot be controlled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not exchange information with a central power supply station and reduces a voltage deviation of a bus of a substation having no self-control ability. It is an object of the present invention to obtain a cooperative distributed control method for a power system that can optimally control a corresponding reactive power.

According to a second aspect of the present invention, a conventional central power supply station is eliminated, and a reactive power passing through a transformer corresponding to a voltage deviation between a substation having no self-control capability and a neighboring substation having the highest sensitivity is set. It is an object of the present invention to obtain a value and thereby obtain a cooperative distributed control method for a power system capable of autonomously controlling a voltage / reactive power control device.

According to a third aspect of the present invention, a voltage deviation generated in a substation having no self-control capability is distributed to each substation according to a sensitivity coefficient ratio, thereby reducing a load on each substation and coping with the voltage deviation. It is an object of the present invention to obtain a cooperative distributed control method of a power system that can optimally control reactive power to be generated.

According to a fourth aspect of the present invention, there is provided a cooperative distributed control method for a power system capable of efficiently distributing a voltage deviation generated in a substation having no self-control capability to each substation by adjusting a distribution coefficient. With the goal.

[0011]

According to a first aspect of the present invention, there is provided a cooperative distributed control method for a power system, wherein a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation to a bus voltage of a substation having no self-control capability. To determine a set of substations with high sensitivity from the sensitivity coefficient, determine that the voltage deviation of the bus bar of the substation without self-control capability has deviated from the allowable range, there is no self-control capability at the time of the deviation According to the present invention, a set value of reactive power passing through a transformer, which is corrected according to the voltage deviation, is set from a substation side to a voltage / reactive power control device installed in a nearby substation.

According to a second aspect of the present invention, there is provided a cooperative distributed control method for a power system, wherein a sensitivity coefficient of a reactive power passing through a transformer in a neighboring substation with respect to a bus voltage of a substation having no self-control ability is obtained. Create a set of substations with high sensitivity from the above, determine that the voltage deviation of the bus of the substation without the self-control ability has deviated from the allowable range, at the time of deviation, the most sensitive substation from the set Select and calculate the correction amount of the transformer passing reactive power of the most sensitive substation corresponding to the voltage deviation, and calculate the transformer passing reactive power set value of the voltage / reactive power control device using the correction amount. Calculate
When the calculated transformer passing reactive power set value exceeds a predetermined upper and lower limit value, the transformer passing reactive power set value is fixed to the upper and lower limit values, and the fixed transformer passing reactive power set value is fixed. The power set value is set in the voltage / reactive power control device.

According to a third aspect of the present invention, there is provided a cooperative distributed control method for a power system, wherein a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability is obtained. Create a set of substations with high sensitivity, determine that the voltage deviation of the bus of the substation without self-control capability has deviated from the allowable range, at the time of the deviation, the voltage deviation to the substation of the set Distributed by the sensitivity coefficient ratio,
A corrected amount of the transformer passing reactive power corresponding to the distributed voltage deviation is calculated, and a transformer passing reactive power set value of the voltage / reactive power control device is calculated using the corrected amount, and the calculated value is calculated. The set value of the reactive power passing through the transformer is set in the voltage / reactive power control device of the substation.

According to a fourth aspect of the present invention, there is provided a cooperative distributed control method for a power system, wherein a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability is obtained. Create a set of substations with high sensitivity, determine that the voltage deviation of the bus of the substation without self-control capability has deviated from the allowable range, at the time of the deviation, select a substation from the set, Among the above voltage deviations,
Calculate the voltage deviation borne by the selected substation,
Calculate the amount of correction of the transformer passing reactive power required to suppress the calculated voltage deviation, and calculate the transformer passing reactive power set value of the voltage / reactive power control device using the correction amount, The calculated transformer passing reactive power set value is set in the voltage / reactive power control device of the substation.

[0015]

According to a first aspect of the present invention, there is provided a cooperative distributed control method for a power system, wherein a sensitivity coefficient of a reactive power passing through a transformer of a nearby substation with respect to a voltage of a substation having no self-control capability is determined in advance. When a voltage deviation occurs in a substation without control capability, the voltage is calculated by requesting reactive power corresponding to the voltage deviation from the voltage / reactive power control device of a sensitive substation based on this sensitivity coefficient. Control.

According to a second aspect of the present invention, there is provided a method for cooperative distributed control of a power system, comprising the steps of correcting a reactive power passing through a transformer corresponding to a voltage deviation between a substation having no self-control capability and a substation having the highest sensitivity in the vicinity. , Thereby obtaining a transformer-passing reactive power set value of the voltage / reactive power control device, and performing upper / lower limit judgments thereof, and then setting the transformer passing reactive power set value to the voltage / reactive power control device. Give to.

According to a third aspect of the present invention, in the power system cooperative distributed control method, the correction amounts of the reactive power of the transformer are all equalized by distributing the voltage deviation to the substations of the set by the sensitivity coefficient ratio. Using the corrected values, a set value of the reactive power passing through the transformer is obtained and given to the voltage / reactive power control device of the selected substation.

According to a fourth aspect of the present invention, there is provided a cooperative distributed control method for an electric power system, wherein a substation is selected, a voltage deviation to be borne by the substation is determined, and a voltage required to suppress the voltage deviation is further reduced. The amount of correction of the reactive power set value of the transformer and the reactive power set value of the transformer including the corrected amount are obtained and provided to the voltage / reactive power control device of the substation.

[0019]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, B1 to B6 are buses, L1 to L3 are loads, LRT1 and LRT2 are on-load tap switching transformers,
T1 is a transformer, and SC1 and SC2 are power capacitors.

Further, SR1 and SR2 are shunt reactors,
S1 to S4 are transmission lines, I3 and I4 are communication lines for transmitting information, VQC1 and VQC2 are voltage and reactive power control devices,
Is the bus voltage of bus B4 on the substation side without self-control capability,
Q1 and Q2 are reactive power passing through the transformer.

Next, the operation will be described with reference to the flowchart of FIG. When considering the voltage control of the bus B4 in the model system of FIG. 1, first, the sensitivity coefficient S _i of the reactive power passing through the transformer of the neighboring substation i with respect to the bus voltage V is represented by S _i.
= ∂V / ∂Q _i (sensitivity coefficient calculation step,
Step ST1).

Next, the sensitivity coefficients S _i determined, the magnitude of the sensitivity coefficients S _i for (absolute value) sensitivity the reference value (bus voltage without substation self control capability, disable transformer passing points substation Boundary value for determining whether the power sensitivity is high) S
_A set U = ｛j || S _i | ≧ S
_ref } (substation set creation step, step ST2). Work up to this point offline.

Then, it is determined whether or not the voltage deviation ΔV of the bus B4 deviates from the allowable range ε (voltage range determination step, step ST3). select (substation selecting step, step ST4), the correction amount delta] Q _j of the transformer passing the reactive power substation j corresponding to the voltage deviation [delta] V, delta] Q _j = delta
It is determined by V / _Sj .

Next, using the ΔQ _j , a transformer passing reactive power set value Q _jset of the voltage / reactive power control device VQC of the substation j is _obtained by Q _jset = Q _j0 + ΔQ _j (correction amount / setting) Value calculation step, step ST5). here,
Q _j0 is the value of the reactive power passing through the transformer, which was set before the voltage deviation occurred.

Then, the transformer passing reactive power set value Q _jset
Exceeds the upper and lower limits Q _jmax and Q _jmin (step S
T6) and the upper and lower limits are fixed to Q _jmax and Q _jmin (set value fixing step, step ST7).

On the other hand, when the transformer passing reactive power set value Q _jset is within the upper and lower limits Q _jmax and Q _jmin , the transformer passing reactive power set value Q _jset obtained from the above equation is _converted to By setting the reactive power control device VQC, it is possible to suppress the voltage deviation occurring in the bus B4 (reactive power setting value for passing through the transformer, step ST8).

After going through the above steps, the process returns to step ST3. If the power deviation .DELTA.V is within the allowable range .epsilon., The process is terminated. To do. The substation selected at this time is the substation with the highest sensitivity except for the substation j selected earlier.

Therefore, according to this control method, there is no need to issue a command from the central power supply station, and autonomous control is performed by a sub-system having no self-control capability and a substation with high sensitivity nearby. Can be. In addition, since the configuration is simpler than that of the conventional control method, it is inexpensive, and the calculation time is short because the optimal power flow calculation is not performed.

Embodiment 2 FIG. Next, another embodiment of the present invention will be described with reference to the flowchart of FIG. In this embodiment, the voltage and voltage installed at the substations included in the set U
A method of requesting the reactive power control device VQC to request the reactive power based on the sensitivity coefficient ratio will be described.

First, a sensitivity coefficient S _i and a set U of substations
(Sensitivity coefficient calculation step, step ST11, substation set creation step, step S11).
T12). Further, in the system shown in FIG. 1, it is determined whether or not the voltage deviation ΔV of the bus B4 has deviated from the allowable range ε (voltage range determining step, step ST13). At the sensitivity coefficient ratio.

Therefore, the corresponding correction amounts ΔQ of the transformer reactive power are equal, and ΔQ = ΔV (S _k / ΣS
_j ) / S _k = ΔV / ΣS _j (reactive power correction amount setting step, step ST14).

Next, the substation j is selected from the set U (step ST15), and the set value Q of the reactive power passing through the transformer is selected.
_jset is _obtained by _Qjset = _Qj0 + ΔQ (set value calculation step, step ST16). Then, the obtained transformer passing reactive power set value Q _jset is set in the power / reactive power control device VQC of the substation j (transformer passing reactive power set value setting step, step ST17).

In this way, it is checked whether or not the setting value of the reactive power for passing through the transformer has been set for all the substations in the set U (step ST18). If not, the processing from step ST16 onward is performed for the next substation. Repeat (step ST19), and if done, end. Here, n is the number of elements of the set U.

Therefore, when this control method is used, the voltage deviation generated in the substations having no self-control ability is distributed to each substation according to the sensitivity coefficient ratio, so that the burden on each substation is reduced, and the sub-system is reduced. , The distortion of the distribution of the reactive power is also reduced.

Embodiment 3 FIG. FIG. 4 shows still another embodiment of the present invention. In this embodiment, an allocation coefficient α _j (Σα _j = 1) is set for each substation included in the set U, and based on the allocation coefficient, the voltage / reactive power control device V
A method for requesting reactive power from QC will be described.

First, a sensitivity S _i and a set U of substations are obtained in the same manner as in FIG. 2 (sensitivity coefficient calculation step, step ST21, substation set creation step, step ST2).
2). Further, in the system shown in FIG. 1, it is determined whether or not the voltage deviation ΔV of the bus B4 has deviated from the allowable range ε (power range determination step, step ST23). select (substations selecting step, step ST24), the voltage deviation is the substation j among the voltage deviation [Delta] V is borne by the [Delta] V _j (.SIGMA..DELTA.V _j = [Delta] V)
From ΔV _j = α _j ΔV (power deviation calculation step, step ST25).

[0037] Here, the transformer passes reactive power Delta] Q _j required to suppress the voltage deviations [Delta] V _j is ΔQ _j = _{ΔV j}
/ S _j , the corrected value Q of the reactive power set value for the transformer passing
_jset is given by Q _jset = Q _j0 + ΔQ _j (correction amount / set value calculation step, step ST26). Therefore, the transformer passing reactive power set value Q _jset is set in the voltage / reactive power control device VQC of the substation j (transformer passing reactive power setting value setting step, step ST27).

In this way, it is checked whether or not the setting value of the reactive power passing through the transformer has been set for all the substations of the set U (step ST28). If not, the processing from step ST25 onward is performed for the next substation. Is repeated (step ST29), and if done, the process ends. Here, n is the number of elements of the set U.

Therefore, according to this control method, by adjusting the distribution coefficient of the voltage deviation occurring in a substation having no self-control capability, the voltage deviation is large from a substation having a considerable control capability and is not very large. It can be distributed efficiently from substations and can be used in various system conditions.

[0040]

As described above, according to the first aspect of the present invention, the sensitivity coefficient of the reactive power passing through the transformer of the neighboring substation with respect to the bus voltage of the substation having no self-control ability is obtained. Create a set of substations with high sensitivity, determine that the voltage deviation of the buses of the substations without self-control capability has deviated from the allowable range, and In the voltage and reactive power control device installed in the station, the transformer passing reactive power set value corrected according to the voltage deviation is set, so that self-control is performed without exchanging information with the central power supply station There is an effect that a reactive power corresponding to a voltage deviation of a bus of a substation having no capability can be optimally controlled.

According to the second aspect of the present invention, the most sensitive substation is selected from the set, and the correction amount of the reactive power passing through the transformer of the most sensitive substation corresponding to the voltage deviation is calculated. Calculate the transformer passing reactive power set value of the voltage / reactive power control device using this correction amount, and when the calculated transformer passing reactive power set value exceeds a predetermined upper and lower limit value, The fixed value of the reactive power passing through the transformer is fixed to the upper and lower limits, and the fixed value of reactive power passing through the transformer is set in the voltage / reactive power control device. And obtains a transformer passing reactive power set value corresponding to the voltage deviation between a substation without self-control capability and a substation with the highest sensitivity in the vicinity, and thereby automatically determines the voltage and reactive power. The effect of obtaining something that can control the control device There is.

According to the third aspect of the present invention, the voltage deviation is distributed to the substations of the above-mentioned set by the sensitivity coefficient ratio, and the correction amount of the transformer passing reactive power corresponding to the distributed voltage deviation is calculated. Using the correction amount, a set value of the reactive power passing through the transformer of the voltage / reactive power control device is calculated, and the calculated set value of the reactive power passing through the transformer is set in the voltage / reactive power control device of the substation. By distributing the voltage deviation generated in the substation without self-control capability to each substation according to the sensitivity coefficient ratio, the burden on each substation is reduced, and the reactive power corresponding to the voltage deviation is reduced. There is an effect that what can be optimally controlled is obtained.

According to the fourth aspect of the present invention, a substation is selected from the set, the voltage deviation of the selected substation is calculated from the voltage deviations, and the calculated voltage deviation is calculated. Calculate the amount of correction of the reactive power passing through the transformer necessary to reduce the amount of power, and calculate the reactive power setting value of the transformer passing through the voltage and reactive power control device using the corrected amount. Since the passing reactive power set value is set in the voltage / reactive power control device of the above-mentioned substation, the voltage deviation caused in the substation without self-control ability is adjusted by adjusting the distribution coefficient, thereby making each substation This has the effect of obtaining something that can be efficiently distributed.

[Brief description of the drawings]

FIG. 1 is a model system diagram used for implementing a cooperative distributed control method for a power system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a cooperative distributed control method for a power system according to an embodiment of the present invention;

FIG. 3 is a flowchart showing a cooperative distributed control method for a power system according to an embodiment of the present invention;

FIG. 4 is a flowchart showing a cooperative distributed control method for a power system according to an embodiment of the present invention;

FIG. 5 is a model system diagram used for implementing a conventional power system control method.

[Explanation of symbols]

B4 Substation bus without self-control capability, VQC1, VQC
QC2 Voltage / reactive power control device.

Continuation of the front page (72) Inventor Toshifumi Murai 1-1-2, Wadasaki-cho, Hyogo-ku, Kobe-shi Inside the control factory of Mitsubishi Electric Corporation (72) Inventor Kazuhito Kibi 6-1-1, Hamayama-dori, Hyogo, Kobe-shi Mitsubishi Electric Engineering Co., Ltd. Kobe Office (72) Inventor Toshiyuki Morita 6-1-1-1 Hamayama-dori, Hyogo, Kobe Mitsubishi Electric Engineering Co., Ltd. Kobe Office (56) References JP-A-3-288915 (JP, A) ( 58) Surveyed field (Int.Cl. ⁷ , DB name) H02J 3/18 G05F 1/70 H02J 3/16

Claims (4)

(57) [Claims] 1. A sensitivity coefficient calculating step for determining a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability, and forming a set of highly sensitive substations from the sensitivity coefficient. Performing a substation set creation step and a voltage range determination step of determining that the voltage deviation of the bus of the substation having no self-control capability has deviated from an allowable range, and the substation having no self-control capability at the time of the deviation. The cooperative distributed control of the power system in which the voltage / reactive power control device of the neighboring substation with high sensitivity is set from the side to the transformer passing reactive power set value corrected according to the voltage deviation based on the sensitivity coefficient. Method. 2. A sensitivity coefficient calculating step for obtaining a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability, and forming a set of highly sensitive substations from the sensitivity coefficient. A substation set creating step, a voltage range determining step of determining that the voltage deviation of the bus of the substation having no self-control capability has deviated from an allowable range, and a substation having the highest sensitivity from the set at the time of the deviation. A substation selecting step of selecting a substation, and calculating a correction amount of the reactive power passing through the transformer of the most sensitive substation corresponding to the voltage deviation, and transforming the voltage / reactive power control device using the correction amount. A correction amount / set value calculation step of calculating a transformer passing reactive power set value, and if the calculated transformer passing reactive power set value exceeds a predetermined upper / lower limit, the transformer passing reactive power set value is calculated. A setting value fixing step of fixing the reactive power set value to the upper and lower limit values, and a transformer passing reactive power set value setting step of setting the fixed transformer passing reactive power set value to the voltage / reactive power control device. Cooperative distributed control method for power systems that implements 3. A sensitivity coefficient calculating step for determining a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability, and forming a set of highly sensitive substations from the sensitivity coefficient. Substation set creation step to perform, a voltage range determination step to determine that the voltage deviation of the bus of the substation without self-control capability has deviated from the allowable range, and when the deviation, the voltage deviation to the substation of the set A reactive power correction amount setting step of calculating a correction amount of the transformer passing reactive power corresponding to the distributed voltage deviation, and a transformer of the voltage / reactive power control device using the correction amount. A setting value calculating step of calculating a passing reactive power set value; and a transformer passing no-pass setting step of setting the calculated transformer passing reactive power setting value to the voltage / reactive power control device of the substation. A cooperative distributed control method for an electric power system, which performs an active power set value setting step. 4. A sensitivity coefficient calculating step for determining a sensitivity coefficient of a reactive power passing through a transformer of a neighboring substation with respect to a bus voltage of a substation having no self-control ability, and forming a set of highly sensitive substations from the sensitivity coefficient. Substation set creation step, a voltage range determination step of determining that the voltage deviation of the bus of the substation without the self-control ability has deviated from an allowable range, and when the deviation occurs, selecting a substation from the set A substation selecting step, a voltage deviation calculating step of calculating a voltage deviation borne by the selected substation among the voltage deviations, and a transformer required to suppress the calculated voltage deviation. Calculate the correction amount of the reactive power passing,
A correction amount / set value calculation step of calculating a transformer passing reactive power set value of the voltage / reactive power control device using the correction amount, and the calculated transformer passing reactive power set value, A cooperative distributed control method for a power system, comprising: performing a transformer passing reactive power set value setting step to be set in a voltage / reactive power control device.