JP4764236B2 - Power quality evaluation system and method, and program - Google Patents

Description

  The present invention relates to a power quality evaluation system for evaluating an introduction effect when a power quality compensation device for improving power quality is introduced into a power system of a target consumer. It relates to the technology to be evaluated.

  Conventionally, various power quality measurement / analysis systems have been proposed and put into practical use in order to measure or analyze the degree of power quality due to harmonics, voltage fluctuations, voltage imbalance, instantaneous voltage drop, etc. occurring in the power system. An example of such a power quality measurement / analysis system is Patent Document 1. In the technique described in Patent Document 1, the power quality required for a power consumer is calculated, and a reference value / optimum value of the power quality for the power consumer is obtained, whereby a consultation or system for the power consumer is obtained. We are trying to contribute to integration.

Among the phenomena that occur in the power system, the occurrence of power quality deterioration phenomena such as harmonics, voltage fluctuations, voltage imbalance, and instantaneous voltage drop are probabilistic, so the probability of power quality deterioration and the degree of damage A system for evaluating power quality has been proposed and put into practical use. (See Patent Document 2).
JP2002-247780 JP-A-2005-73346

  By the way, the occurrence of power quality deterioration phenomena such as harmonics, voltage fluctuations, voltage imbalances, and instantaneous voltage drops occurring in the power system has a large stochastic factor. For this reason, it is not sufficient to simply calculate the power quality level to evaluate the power quality of the power system, and it is possible to calculate the probability of occurrence of power quality deterioration and perform quality evaluation using this as a decision factor. is important.

  However, the conventional power quality measuring device only shows a power quality index between the power consumer and the power selling company. In the system described in Patent Document 1, the power quality reference value / optimum value is determined for each power consumer, but quality evaluation that incorporates the occurrence probability of the power quality deterioration phenomenon as a determination factor is performed. It wasn't. That is, in the prior art, the deterioration in power quality was not caught from the viewpoint of occurrence probability. For this reason, development of the system which can evaluate electric power quality with higher precision was desired.

  Moreover, if power quality deteriorates, of course, economic loss will also occur. However, the conventional power quality measuring device only evaluates the power quality from the physical aspect, and it has come to clearly show the correlation between the degree of deterioration of the power quality and the economic damage. There wasn't. Therefore, conventionally, development of a power quality evaluation system in consideration of economic loss has been desired.

  Furthermore, recently, in addition to deregulation in the electric power business field, development of environmentally conscious small power generators such as fuel cells and wind power generators is also remarkable. Under such circumstances, power demand tends to be reduced. Along with this, the types of electric power consumers are subdivided, and the electric power quality level required for each electric power consumer is constantly diversifying. In addition, power consumers are expected to have a small-scale power supply and power storage device and use multiple types of power. Therefore, the level required by the electric power consumer varies depending on which of the facilities that the electric power consumer has to use. For this reason, there has been a tendency for the power quality to become multi-quality, and it has been desired to develop a system that can more flexibly evaluate the power quality.

  Today, various power quality compensators have been introduced to improve the power quality in the power system, and both the effectiveness and economics of introducing a new power quality compensator are comprehensive. The development of a system that can be evaluated efficiently has been desired.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to introduce harmonic countermeasure equipment as a power quality compensator for improving power quality. It is an object of the present invention to provide a power quality evaluation system, method, and program capable of comprehensively evaluating the introduction effect from both the economical aspect and the electrical aspect in consideration of the occurrence probability of the power quality deterioration phenomenon.

  In order to achieve the above object, the present invention calculates the amount of harmonics and the amount of damage before and after the introduction of a harmonic countermeasure facility as a power quality compensator, and introduces the harmonic countermeasure facility. By calculating the damage improvement amount and the return on investment and evaluating the introduction effect, the introduction effect when introducing harmonic countermeasure equipment is considered in terms of economic aspects and electricity, taking into consideration the probability of occurrence of power quality deterioration phenomenon. It is designed to be comprehensively evaluated from both aspects.

  The power quality evaluation system of the present invention is a system information setting means for evaluating an introduction effect when a harmonic countermeasure facility is introduced as a power quality compensator for improving power quality in an evaluation target power system. , Pre-introduction harmonic amount calculation means, pre-introduction damage amount calculation means, countermeasure equipment selection means, post-introduction harmonic amount calculation means, post-introduction damage amount calculation means, damage improvement amount calculation means, return on investment calculation means It is characterized by that.

  Here, the system information setting means is means for setting system information of the evaluation target power system, and the pre-introduction harmonic amount calculation means is a harmonic before introducing the harmonic countermeasure equipment into the evaluation target power system. It is a means for calculating the generation amount. The pre-introduction damage calculation means is a means for calculating the damage occurrence amount before the introduction of the countermeasure equipment from the harmonic amount calculated by the pre-introduction harmonic quantity calculation means and the harmonic tolerance of the load, and the countermeasure equipment selection means is A means for selecting a harmonic countermeasure facility to be evaluated from a plurality of harmonic countermeasure facilities.

  The post-introduction harmonic amount calculation means is a means for calculating a harmonic generation amount after the selected harmonic countermeasure equipment is introduced into the evaluation target power system, and the post-introduction damage calculation means is the post-introduction harmonic calculation means. This is a means for calculating the amount of damage generated after the introduction of countermeasure equipment from the harmonic quantity calculated by the wave quantity calculating means and the harmonic tolerance of the load. The damage improvement amount calculation means is a means for calculating the damage improvement amount by the countermeasure equipment from the damage occurrence amount before and after the introduction of the harmonic countermeasure equipment, and the return on investment calculation means is the damage improvement amount and the introduction cost of the countermeasure equipment. This is a means for calculating the internal rate of return due to the introduction of the countermeasure equipment from the operation cost and the maintenance cost.

  Moreover, the power quality evaluation method and the power quality evaluation program of the present invention grasp the above characteristics of the power quality evaluation system from different viewpoints.

  According to the present invention having such characteristics, the system information of the power system to be evaluated is set, and the amount of harmonics and the amount of damage before and after the introduction of the harmonic countermeasure equipment as a power quality compensator are calculated in this power system. In addition, by calculating the damage improvement amount and the return on investment by introducing the harmonic countermeasure equipment and evaluating the introduction effect, the introduction effect when introducing the harmonic countermeasure equipment is considered to be the probability of the occurrence of the power quality deterioration phenomenon. Can be comprehensively evaluated from both the economic and electrical aspects.

  According to the present invention, the introduction effect when the harmonic countermeasure equipment is introduced as a power quality compensator for improving the power quality, the economic aspect and the electrical performance are considered in consideration of the occurrence probability of the power quality deterioration phenomenon. It is possible to provide a power quality evaluation system, method, and program that can be comprehensively evaluated from both aspects.

  Hereinafter, a plurality of embodiments of a power quality evaluation system according to the present invention will be specifically described with reference to the drawings.

(1) First Embodiment (1-1) System Configuration FIG. 1 is a configuration diagram showing a configuration of a first embodiment of a power quality evaluation system to which the present invention is applied. As shown in FIG. 1, the power quality evaluation system 1 according to the present embodiment includes a system information setting unit 2, a pre-introduction harmonic amount calculation unit 3, a pre-introduction damage calculation unit 4, a countermeasure facility selection unit 5, and a post-introduction. Harmonic amount calculation means 6, post-installation damage amount calculation means 7, damage improvement amount calculation means 8, return on investment calculation means 9, and evaluation result display means 10, and receives an instruction from the user through the interface device 20. At the same time, processing results and data in the middle of processing are output to the user. Below, each said means 2-10 is demonstrated one by one.

  Note that the harmonic countermeasure equipment used as the power quality compensator includes, for example, a power filter (LC filter), an active filter, or a multiphase power converter.

  In the system information setting means 2, the user inputs / sets system information necessary for evaluating a system to be evaluated (hereinafter referred to as a target system) into the system. Examples of system information necessary for the evaluation include load equipment information in customers, harmonic generation source information, information on the amount of damage caused by load equipment stoppage or malfunction, operation information of equipment that is a harmonic generation source, etc. The system information is input / set by the system information setting means 2.

  Moreover, although the harmonic generation source may flow into the customer system from the outside or may be generated in the customer system, they can be arbitrarily set. Information input and set by the system information setting unit 2 is transmitted to the pre-introduction harmonic amount calculation unit 3.

  The pre-introduction harmonic amount calculation means 3 calculates the harmonic generation amount in the target system before introducing the harmonic countermeasure equipment into the customer system based on the information input / set by the system information setting means 2 To do. In other words, the amount of harmonics is calculated by the harmonic shunt calculation of the target system based on the harmonic generation source information set by the system information setting means 2. From the calculation result of the harmonic amount of the target system, the harmonic amount at the load end at which the stoppage or malfunction occurs due to the harmonic and the damage occurs is transmitted to the pre-introduction damage amount calculation means 4.

  In the pre-introduction damage amount calculation means 4, the amount of harmonics transmitted from the pre-introduction harmonic amount calculation means 3 is compared with the withstand capacity against the harmonic current of the load equipment (hereinafter referred to as harmonic current withstand capability), and damage is generated. Calculate the amount. That is, as shown in FIG. 2, when there is even one order in which the harmonic current amount exceeds the harmonic current tolerance of the load equipment, “the load equipment stops or malfunctions and damage occurs”. to decide.

  Alternatively, as shown in FIG. 3, when there is even one order in which the voltage harmonic exceeds the tolerance against the harmonic voltage of the load equipment (hereinafter referred to as harmonic voltage tolerance), “the load equipment is stopped or It will be malfunctioned and damage will occur. In the example of FIGS. 2 and 3, the “fifth order” is determined as “the load facility is stopped or malfunctions, and damage occurs”.

In FIGS. 2 and 3, the harmonic order to be evaluated can be arbitrarily set. Further, as a method for evaluating the occurrence of damage, there is an overall distortion rate in addition to FIGS. When evaluating with the total distortion factor, the total distortion factor is calculated from the harmonic amount of each order transmitted from the pre-introduction harmonic amount calculation means 3 according to the equation (1), and the tolerance to the harmonic distortion factor of the load equipment is calculated. Compare with
(Total distortion) = (Effective value of only harmonic component) / (Effective value of fundamental wave component) (1)

  The damage occurrence amount when it is determined that damage will occur is the damage amount when the load facility stoppage or malfunction that is set in the system information setting means 2 occurs once, and the harmonic generation source is in the operating state. Based on the probability information, the damage occurrence amount before the introduction of the countermeasure equipment is calculated by the equation (2).

(Damage amount)
= (Amount of damage caused by one stop of load equipment / malfunction)
× (Annual probability that the harmonic generation source will be in the operating state) (2)

  Next, the amount of damage caused by the installation of harmonic countermeasure facilities is obtained. First, the countermeasure facility selection means 5 selects a countermeasure facility to be introduced into the target system from a plurality of harmonic countermeasure facilities prepared in the system in advance. The countermeasure facility information selected by the countermeasure facility selecting means 5 is transmitted to the post-introduction harmonic amount calculating means 6.

  The post-introduction harmonic amount calculation means 6 uses the information input / set by the system information setting means 2 and the countermeasure equipment information selected by the countermeasure equipment selection means 5 to provide the harmonic countermeasure equipment to the customer. Calculate the amount of harmonics generated in the target system after introduction into the system. For the calculation of the amount of harmonics, based on the harmonic generation source information set by the system information setting means 2, it is calculated by the harmonic shunt calculation of the target system. From the harmonic amount calculation result of the target system, the harmonic amount at the load end where the stop or malfunction occurs due to the harmonic and damage occurs is transmitted to the post-introduction damage amount calculation means 7.

  The post-introduction damage amount calculation means 7 compares the harmonic amount transmitted from the post-introduction harmonic amount calculation means 6 with the harmonic tolerance of the load facility, and calculates the damage occurrence amount after the introduction of the countermeasure equipment. That is, as with the pre-introduction damage calculation means 4, as shown in FIG. 2, if there is even one order in which the harmonic current amount exceeds the harmonic current tolerance of the load, “load equipment is stopped or malfunctioned” And damage will occur. " Alternatively, as shown in FIG. 3, when there is even one order in which the voltage harmonic exceeds the harmonic voltage tolerance of the load, it is determined that “the load facility is stopped or malfunctions and damage occurs”.

  As an evaluation method for the occurrence of damage, there is an overall distortion rate in addition to FIGS. When evaluating with the total distortion factor, the total distortion factor is calculated from the harmonic amount of each order transmitted from the post-introduction harmonic amount calculation means 6 by the above equation (1), and the harmonic distortion factor of the load equipment is calculated. Compare with tolerance.

  Through the processing so far, the amount of damage occurrence before the introduction of the harmonic countermeasure equipment and after the introduction of the harmonic countermeasure equipment is calculated, and these are transmitted to the damage improvement amount calculation means 8 and the return on investment calculation means 9.

In the damage improvement amount calculation means 8, the damage occurrence amount before introduction of the countermeasure equipment transmitted from the damage amount calculation means 4 before introduction and the damage occurrence amount after introduction of the countermeasure equipment transmitted from the damage amount calculation means 7 after introduction are used. Then, calculate the amount of damage improvement by the countermeasure equipment using equation (3). Then, the damage improvement amount calculated by the damage improvement amount calculation means 8 is transmitted to the evaluation result display means 10.
(Damage improvement amount)
= (Damage amount before introduction of countermeasure equipment)-(Amount of damage occurrence after introduction of countermeasure equipment) ... (3)

  On the other hand, the return-on-investment calculation means 9 is the damage occurrence amount before the introduction of countermeasure equipment calculated by the damage amount calculation means 4 before introduction and the damage occurrence amount after introduction of the countermeasure equipment calculated by the damage amount calculation means 7 after introduction. And the economic effect (internal rate of return) of introducing the countermeasure equipment from the introduction cost of the countermeasure equipment stored and stored in the system in advance, the annual operation cost, and the annual maintenance cost. The index value of economic effect is calculated by the equation (4).

(Economic effect index value of countermeasure equipment)
= (Damage amount before introduction of countermeasure equipment) x (years)
-(Damage after introduction of countermeasure equipment) x (years)
-(Introduction cost of countermeasure equipment)
-(Annual operating cost of countermeasure equipment) x (Number of years)
-(Annual maintenance cost of countermeasure equipment) x (number of years) ... (4)

  In the equation (4), if the introduction cost, operation cost, and maintenance cost of the countermeasure facility are increased, the economic effect index value of the countermeasure facility is decreased. Further, if the economic effect index value of the countermeasure equipment calculated by the equation (4) is positive, it means that the profitability is economical, and if it is negative, it means that the profitability is not economical. Thus, by performing the process of the return on investment calculation means 9, it is possible to calculate the economic introduction effect of the countermeasure equipment. Then, the economic effect index value calculated by the return on investment calculation means 9 is transmitted to the evaluation result display means 10.

  In the evaluation result display means 10, the damage occurrence amount before the introduction of the countermeasure equipment, the damage occurrence amount after the introduction of the countermeasure equipment, the damage improvement amount by the countermeasure equipment calculated by the damage improvement amount calculation means 8, and the return on investment calculation means 9 Performs processing to display economic effect index values and the like. For example, as shown in FIG. 4, the economic effect index value calculated by the return on investment calculation means 9 is displayed as a graph with the horizontal axis representing the number of years and the vertical axis representing the economic effect index value.

  In addition, the evaluation result display means 10 has a function of accumulating and storing the results of evaluation for a plurality of countermeasure facilities, so that the introduction effects can be easily compared for a plurality of countermeasure facilities. As shown in FIGS. 5A and 5B, a graph can be displayed.

(1-2) Power Quality Evaluation Process FIG. 6 is a flowchart showing an example of the power quality evaluation process by the power quality evaluation system 1 of the present embodiment having the above-described configuration. Below, the outline | summary of the electric power quality evaluation process by this embodiment is demonstrated, referring this flowchart.

  First, as illustrated in FIG. 6, when the system information setting process of the power system to be evaluated is performed by the user through the interface device 20 (step 601), the amount of harmonic generation before the introduction of the harmonic countermeasure facility is performed. Is calculated (step 602), and the damage occurrence amount in that case is calculated (step 603).

  Next, when a harmonic countermeasure facility to be evaluated for introduction is selected by the user through the interface device 20 (step 604), a harmonic generation amount when the harmonic countermeasure facility is introduced is calculated (step 605). In this case, the damage occurrence amount is calculated (step 606). Subsequently, the amount of damage improvement by introducing the countermeasure equipment according to the above formula (3) from the damage occurrence amount before introduction of the countermeasure equipment calculated in step 603 and the damage occurrence amount after introduction of the countermeasure equipment calculated in step 606. Is calculated (step 607).

  Subsequently, the return on investment of the countermeasure facility is calculated by the above equation (4) from the damage improvement amount obtained in step 607, the introduction cost of the countermeasure facility, the operation cost of the countermeasure facility, and the maintenance cost of the countermeasure facility. (Step 608). Then, evaluation results such as the amount of harmonics generated before and after the introduction of the countermeasure equipment, the amount of damage generated, the amount of damage improvement, and the return on investment effect obtained in each step are displayed through the interface device 20 (step 609), and are displayed to the user. On the other hand, it is confirmed whether or not the introduction evaluation is performed for another harmonic countermeasure facility, in other words, whether or not the harmonic countermeasure facility for which the introduction evaluation is to be performed is changed (step 610).

  When it is desired to introduce and evaluate another harmonic countermeasure facility for such confirmation, if the user gives an instruction to change the harmonic countermeasure facility (YES in step 610), the process proceeds to step 604. Returning, the interface device 20 performs another harmonic countermeasure equipment selection process for introduction evaluation from the user, and the processes of step 604 to step 610 are repeated.

  On the other hand, if the user does not wish to evaluate the introduction of another harmonic countermeasure facility in step 610 (NO in step 610), the process proceeds to step 611 to determine whether or not to end the power quality evaluation system. Whether or not to perform power quality evaluation processing by this power quality evaluation system is also confirmed for another power system (step 611).

  In response to such confirmation, if the user gives an instruction to execute power quality evaluation by this system for another power system (NO in step 611), the process returns to step 601 and another power The processing from step 601 to step 611 is repeated for the system. On the other hand, in step 611, when the user does not desire the power quality evaluation for another power system (YES in step 611), the processing of this system is terminated.

  In addition, in the power quality evaluation system 1 of this embodiment, in the process which calculates the harmonic generation amount before countermeasure equipment introduction and after countermeasure equipment introduction, it generate | occur | produces in a consumer by considering the system characteristic of the whole object system | strain. The harmonics can be calculated with high accuracy. In other words, the amount of harmonic generation is not calculated based only on the information (configuration) only near the load facility for which it is desired to evaluate whether or not damage occurs, but the calculation is performed in consideration of the influence of the facility and configuration of the entire system.

  For example, as shown in FIG. 7, the harmonic shunt calculation is performed in consideration of the line impedance in the target system, the effects of all the harmonic source facilities in the target system, or the main harmonic source facilities. It is configured.

(1-3) Effects According to the present embodiment, comprehensive evaluation when introducing harmonic countermeasure equipment can be performed in consideration of the system characteristics of the entire target system, and therefore, a highly accurate evaluation result. Can be provided.

(2) 2nd Embodiment FIG. 8: is a block diagram which shows the structure of 2nd Embodiment of the power quality evaluation system to which this invention is applied. As shown in FIG. 8, the power quality evaluation system 1 according to the present embodiment includes a harmonic generation source facility database 11 that stores and stores harmonic generation source facility data in addition to the system configuration of the first embodiment. It is equipped with.

  In the harmonic generation source facility database 11, for example, harmonic generation amounts and annual generation probabilities are stored and stored for each operation state of facilities that serve as harmonic generation sources as shown in Tables 1 and 2.

  The “annual occurrence probability” in Table 2 is the annual probability that the harmonic generation source will be in the operating state. For example, statistical processing is performed based on the annual operating data measured in advance, and the data is accumulated and stored in the database. Keep it.

  Data stored and stored in the system database in advance as shown in Tables 1 and 2 is associated with the harmonic generation source equipment in the target system by the system information setting unit 2, and the pre-introduction harmonic amount calculation unit 3 or It is reflected in the harmonic amount calculation processing (harmonic branching calculation of the target system) of the post-introduction harmonic amount calculation means 6.

  The harmonic generation source equipment database 11 can be freely updated, added, and deleted by the user.

  According to this embodiment, it is possible to use harmonic generation source facility information prepared in advance in the system for comprehensive evaluation when introducing harmonic countermeasure facilities, and the harmonic generation source facility database 11 is Since it can be updated at any time, a versatile power quality evaluation system can be provided.

(3) Third Embodiment FIG. 9 is a configuration diagram showing a configuration of a third embodiment of the power quality evaluation system to which the present invention is applied. As shown in FIG. 9, the power quality evaluation system 1 according to this embodiment includes a countermeasure facility database 12 that stores and stores harmonic countermeasure facility data in addition to the system configuration of the first embodiment. It is.

  This countermeasure equipment database 12 stores and stores data necessary for harmonic shunting and economic calculation such as equipment capacity of harmonic countermeasure equipment, equipment constants, introduction costs, annual operation costs, annual maintenance costs, etc. Saved. Table 3 shows an example in which the harmonic countermeasure equipment is a harmonic filter.

  Data stored and stored in the system database in advance as shown in Table 3 includes system information setting means 2, pre-introduction harmonic amount calculation means 3, countermeasure equipment selection means 5, post-introduction harmonic amount calculation means 6, and investment Referenced by each of the effect calculation means 9.

  That is, in the system information setting means 2 and the pre-introduction harmonic amount calculation means 3, when the harmonic countermeasure equipment is installed in the target system as the existing equipment, the existing harmonic countermeasure equipment data is used as the countermeasure equipment database. 12, the pre-introduction harmonic amount calculation means 3 reflects the referenced data to the harmonic shunt calculation.

  In addition, the countermeasure equipment selection means 5 and the post-introduction harmonic amount calculation means 6 refer to the countermeasure equipment database 12 for data about the equipment that is newly introduced as a harmonic countermeasure equipment, and the post-introduction harmonic amount calculation means. In step 6, the referenced data is reflected in the harmonic shunt calculation.

  Further, the return-on-investment calculation means 9 refers to cost data (introduction cost, annual operation cost, annual maintenance cost, etc.) of the countermeasure equipment selected by the countermeasure equipment selection means 5 from the countermeasure equipment database 12, and is an economic evaluation index. Used to calculate

  The countermeasure facility database 12 can be freely updated / added / deleted by the user.

  According to the present embodiment, it is possible to perform a comprehensive evaluation when introducing harmonic countermeasure equipment using the harmonic countermeasure equipment information prepared in advance in the system, and the countermeasure equipment database 12 is stored as needed. Since it can be updated, a highly versatile power quality evaluation system can be provided.

(4) 4th Embodiment FIG. 10: is a block diagram which shows the structure of 4th Embodiment of the power quality evaluation system to which this invention is applied. As shown in FIG. 10, the power quality evaluation system 1 according to the present embodiment includes a load facility database 13 that stores and stores load facility data in addition to the system configuration of the first embodiment. .

  In the load facility database 13, for example, harmonic tolerance data (data corresponding to the dotted lines in FIGS. 2 and 3) of the load facility as shown in Table 4 is accumulated and stored.

  Data stored and stored in the system database in advance as shown in Table 4 is referred to by the pre-introduction damage amount calculation means 4 and the post-introduction damage amount calculation means 7. That is, the pre-introduction damage amount calculation means 4 refers to the load capacity database 13 for the harmonic tolerance data corresponding to the load equipment for which it is desired to evaluate whether damage due to the harmonics occurs, and the pre-introduction harmonic amount calculation means 3 The amount of harmonics calculated in step 1 is compared with the amount of harmonic tolerance referenced from the load facility database 13 to evaluate the occurrence of damage and calculate the amount of damage.

  On the other hand, the post-introduction damage calculation means 7 refers to the harmonic capacity data corresponding to the load equipment for which it is desired to evaluate whether damage due to the harmonics occurs, from the load equipment database 13, and the post-introduction harmonic quantity calculation means 6 The amount of harmonics calculated in step 1 is compared with the amount of harmonic tolerance referenced from the load facility database 13 to evaluate the occurrence of damage and calculate the amount of damage.

  The load facility database 13 can be freely updated, added, and deleted by the user.

  According to the present embodiment, it is possible to handle the harmonic capacity tolerance data of the load facility in the system, and it is possible to provide a power quality evaluation system that can determine whether or not the load facility is damaged. Moreover, since the load equipment database 13 can be updated at any time, a highly versatile power quality evaluation system can be provided.

(5) Fifth Embodiment (5-1) System Configuration FIG. 11 is a configuration diagram showing a configuration of a fifth embodiment of a power quality evaluation system to which the present invention is applied. As shown in FIG. 11, in addition to the system configuration of the first embodiment, the power quality evaluation system 1 in the present embodiment includes a non-harmonic generation facility information setting unit 21 and harmonic generation in the system information setting unit 2. Source facility information setting means 22 is provided.

  As described in the first embodiment, information necessary for evaluation is set in the system information setting unit 2 of the power quality evaluation system 1, but in the case of this embodiment, the facility information that does not generate harmonics. Is set by the non-harmonic generation facility information setting means 21, and the facility information for generating harmonics is set by the harmonic generation source facility information setting means 22.

  The harmonic generation source facility information setting means 22 refers to the operation / operation state of the harmonic generation source facility from the data stored and stored in the harmonic generation source facility database 11 described in the second embodiment. Or the user can select whether to make input settings arbitrarily. And when it chooses to refer from the harmonic generation source equipment database 11, it extracts that the operation state of a harmonic generation source equipment is extracted from the harmonic generation source equipment database 11, and a user selects input setting arbitrarily In such a case, the amount of generated harmonics of the harmonic generation source equipment and the annual probability of occurrence of an arbitrarily set operation state can be arbitrarily set.

(5-2) System Information Setting Process FIG. 12 is a flowchart showing details of the system information setting process in the power quality evaluation process by the power quality evaluation system 1 of the present embodiment having the above-described configuration. Below, the outline | summary of the system | strain information setting process in the electric power quality evaluation process by this embodiment is demonstrated, referring this flowchart.

  First, as shown in FIG. 12, through the interface device 20, the system configuration of the power system to be evaluated and the setting processing of the information of the non-harmonic generating equipment necessary for the evaluation are performed by the user (step 1201). Whether or not to refer to the harmonic generation source facility database is confirmed to the user through the interface device 20 so that the harmonic generation source facility information can be set by a method desired by the user (step 1202). ).

  In step 1202, when the user gives an instruction to refer to the harmonic generation source facility database (YES in S1102), the harmonic generation source facility information is obtained by referring to the harmonic generation source facility database. It is set (step 1203).

  On the other hand, in step 1202, if the user does not refer to the harmonic generation source equipment database, in other words, if the user gives an instruction to input and set (NO in S1102), the user is made through the interface device 20. Is acquired (step 1204).

  After the harmonic generation source facility information is set in step 1203 or step 1204, the processing from step 602 to step 611 in the flowchart shown in FIG. 6 is performed.

(5-3) Effect According to the present embodiment, the harmonic generation source that uses the operation state data of the harmonic generation source equipment based on the actual measurement data stored and stored in the database, or is arbitrarily set by the user. It is possible to select a setting method for harmonic generation source facility data, such as using facility operation state data. Thereby, since the system can be properly used according to the information form acquired in advance, a highly versatile power quality evaluation system can be provided.

(6) Other Embodiments The present invention is not limited to the above-described embodiments, and various other variations can be implemented within the scope of the present invention. For example, the system configuration and apparatus configuration shown in the drawings are merely examples, and a specific configuration can be selected as appropriate. Moreover, the flowchart shown in drawing is only an example, and a specific process procedure and the detail of each process can be selected suitably.

  Further, in the above-described embodiments, the case where the method of the present invention is realized as a system and method by computer hardware and a program has been described. However, the method of the present invention can be applied to recording on a magnetic disk, an optical disk, a semiconductor memory, and the like. It can also be realized in the form of only a computer program recorded on a medium and specialized for power quality evaluation.

The lineblock diagram showing the composition of a 1st embodiment of the power quality evaluation system concerning the present invention. Explanatory drawing of judgment of the occurrence of damage based on the harmonic current amount used with the power quality evaluation system of FIG. 1 and the harmonic current tolerance of the load equipment. Explanatory drawing of judgment of the occurrence of damage based on the amount of voltage harmonics used in the power quality evaluation system of FIG. 1 and the voltage harmonic tolerance of the load. The figure which shows the example of a display of the evaluation result of the electric power quality evaluation system of FIG. The figure which shows the example of a display of the evaluation result of the electric power quality evaluation system of FIG. The flowchart which shows an example of the power quality evaluation process by the power quality evaluation system of FIG. The figure which shows an example of the electric power system used as evaluation object. The block diagram which shows the structure of 2nd Embodiment of the electric power quality evaluation system which concerns on this invention. The block diagram which shows the structure of 3rd Embodiment of the power quality evaluation system which concerns on this invention. The block diagram which shows the structure of 4th Embodiment of the electric power quality evaluation system which concerns on this invention. The block diagram which shows the structure of 5th Embodiment of the electric power quality evaluation system which concerns on this invention. The flowchart which shows an example of the system | strain information setting process in the electric power quality evaluation system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric power quality evaluation system 2 ... System information setting means 3 ... Harmonic amount calculation means before introduction 4 ... Damage amount calculation means before introduction 5 ... Countermeasure equipment selection means 6 ... Harmonic amount calculation means after introduction 7 ... Damage amount after introduction Calculation means 8 ... Damage improvement amount calculation means 9 ... Investment return calculation means 10 ... Evaluation result display means 11 ... Harmonic generation source equipment database 12 ... Countermeasure equipment database 13 ... Load equipment database 21 ... Non-harmonic generation equipment information setting means 22 ... Harmonic source equipment information setting means

Claims (8)

In the power quality evaluation system that evaluates the introduction effect when introducing harmonic countermeasure equipment as a power quality compensation device to improve power quality in the power system to be evaluated,
Grid information setting means for setting grid information of the evaluation target power grid,
A pre-introduction harmonic amount calculating means for calculating a harmonic generation amount before introducing the harmonic countermeasure equipment into the evaluation target power system;
The occurrence of damage is determined from the amount of harmonics calculated by the pre-introduction harmonic amount calculation means and the harmonic tolerance of the load, and the amount of damage when one stop or malfunction of the load occurs, and the harmonics A pre-introduction damage amount calculation means for calculating a damage generation amount before the introduction of countermeasure equipment from the probability that the generation source generates a harmonic exceeding the harmonic tolerance of the load ;
A countermeasure facility selection means for selecting a harmonic countermeasure facility to be evaluated from a plurality of harmonic countermeasure facilities;
A post-introduction harmonic amount calculating means for calculating a harmonic generation amount after introducing the selected harmonic countermeasure equipment into the evaluation target power system;
The occurrence of damage is determined from the amount of harmonics calculated by the harmonic amount calculation means after introduction and the harmonic tolerance of the load, and the amount of damage when one stop or malfunction of the load occurs, and the harmonics A post-introduction damage amount calculating means for calculating a damage generation amount after the introduction of countermeasure equipment from the probability that the generation source generates harmonics exceeding the harmonic tolerance of the load ;
Damage improvement amount calculation means for calculating the damage improvement amount by the countermeasure equipment from the damage occurrence amount before and after the introduction of the harmonic countermeasure equipment,
A return-on-investment calculation means for calculating the internal rate of return by introducing the countermeasure equipment from the damage improvement amount of the countermeasure equipment, introduction cost, operation cost, maintenance cost;
A power quality evaluation system characterized by comprising:   2. The pre-introduction harmonic amount calculation unit and the post-introduction harmonic amount calculation unit are configured to calculate a harmonic amount in consideration of the system characteristics of the entire evaluation target system. Power quality evaluation system.   The power quality evaluation system according to claim 1 or 2, further comprising a harmonic generation source facility database in which a plurality of types of harmonic generation source facility data are accumulated and stored.   The power quality evaluation system according to any one of claims 1 to 3, further comprising a countermeasure facility database that stores and stores a plurality of types of harmonic countermeasure facility data.   The power quality evaluation system according to any one of claims 1 to 4, further comprising a load facility database that stores and stores a plurality of types of load facility data.   Whether the system information setting means is set by the user at the time of setting the harmonic generation source equipment data, or is set based on actually measured data stored and stored in the harmonic generation source equipment database. The power quality evaluation system according to any one of claims 3 to 5, wherein the power quality evaluation system is configured to be able to select a power source. In the power quality evaluation method for evaluating the introduction effect when introducing harmonic countermeasure equipment as a power quality compensation device for improving power quality in the power system to be evaluated,
System information setting means, pre-introduction harmonic amount calculation means, pre-introduction damage amount calculation means, countermeasure equipment selection means, post-introduction harmonic amount calculation means, post-introduction damage amount calculation means realized by a computer and software for controlling it , Using damage improvement calculation means and return on investment calculation means,
By the system information setting means, processing for setting system information of the evaluation target power system,
A process of calculating a harmonic generation amount before introducing the harmonic countermeasure equipment into the evaluation target power system by the pre-introduction harmonic amount calculation means;
The pre-introduction damage amount calculation means judges the occurrence of damage from the harmonic amount calculated by the pre-introduction harmonic amount calculation means and the harmonic tolerance of the load, and one stoppage or malfunction of the load occurs. Processing to calculate the damage occurrence amount before the introduction of countermeasure equipment from the damage amount when the damage is generated and the probability that the harmonic generation source generates harmonics exceeding the harmonic tolerance of the load ,
Processing for selecting a harmonic countermeasure facility to be evaluated from a plurality of harmonic countermeasure facilities by the countermeasure facility selecting means;
A process of calculating a harmonic generation amount after introducing the selected harmonic countermeasure equipment into the evaluation target power system by the post-introduction harmonic amount calculation means;
The post-introduction damage amount calculation means determines the occurrence of damage from the harmonic amount calculated by the post-introduction harmonic amount calculation means and the harmonic tolerance of the load, and one stoppage or malfunction of the load occurs. Processing to calculate the damage occurrence amount after the introduction of the countermeasure equipment from the damage amount when it is done and the probability that the harmonic generation source generates harmonics exceeding the harmonic tolerance of the load ,
A process for calculating the damage improvement amount by the countermeasure equipment from the damage occurrence amount before and after the introduction of the harmonic countermeasure equipment by the damage improvement amount calculation means;
A process for calculating an internal rate of return due to the introduction of the countermeasure equipment from the damage improvement amount, introduction cost, operation cost, maintenance cost of the countermeasure equipment by the return on investment calculation means;
A power quality evaluation method characterized by: In the power quality evaluation program that evaluates the introduction effect when introducing harmonic countermeasure equipment as a power quality compensation device for improving power quality in the power system to be evaluated using a computer,
Grid information setting means for setting grid information of the evaluation target power grid,
A pre-introduction harmonic amount calculating means for calculating a harmonic generation amount before introducing the harmonic countermeasure equipment into the evaluation target power system;
The occurrence of damage is determined from the amount of harmonics calculated by the pre-introduction harmonic amount calculation means and the harmonic tolerance of the load, and the amount of damage when one stop or malfunction of the load occurs, and the harmonics A pre-introduction damage amount calculation means for calculating a damage generation amount before the introduction of countermeasure equipment from the probability that the generation source generates a harmonic exceeding the harmonic tolerance of the load ;
A countermeasure facility selection means for selecting a harmonic countermeasure facility to be evaluated from a plurality of harmonic countermeasure facilities;
A post-introduction harmonic amount calculating means for calculating a harmonic generation amount after introducing the selected harmonic countermeasure equipment into the evaluation target power system;
The occurrence of damage is determined from the amount of harmonics calculated by the harmonic amount calculation means after introduction and the harmonic tolerance of the load, and the amount of damage when one stop or malfunction of the load occurs, and the harmonics A post-introduction damage amount calculating means for calculating a damage generation amount after the introduction of countermeasure equipment from the probability that the generation source generates harmonics exceeding the harmonic tolerance of the load ;
Damage improvement amount calculation means for calculating the damage improvement amount by the countermeasure equipment from the damage occurrence amount before and after the introduction of the harmonic countermeasure equipment,
A return-on-investment calculation means for calculating the internal rate of return by introducing the countermeasure equipment from the damage improvement amount of the countermeasure equipment, introduction cost, operation cost, maintenance cost;
Is realized by the computer.

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