JP2002116228A - Harmonics measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a harmonics measuring device capable of having the effects of reducing electric power by taking measures to suppress harmonic waves on an object to be measured which generates harmonic waves, evaluating its amount of money, and introducing a harmonics suppressing apparatus with good cost performance. SOLUTION: In the harmonics measuring device, the input voltage and input current of the object to be measured 1 are converted into signals suitable for measurements by a potential transformer PT 2 for a meter and a current transformer CT 3 for a meter and are inputted to a harmonic electric energy measuring means 4, and the electric energy of only harmonic components is measured. The electric energy of only harmonic components after a predetermined period is estimated by an estimated harmonic electric energy measuring means 5. A unit price is set by an electricity rate unit price setting means 6. From the unit price data, the data of the harmonic electric energy measuring means 4, and the data of the estimated harmonic electric energy measuring means 5, by an electricity rate computing means 7 and an estimated electricity rate computing means 8, the amount of money of cumulative electric energy and the estimated harmonic electric energy after a predetermined period is displayed, and an optimal suppressing apparatus is determined on the basis of the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic measuring device for measuring a power of a harmonic from an input voltage and an input current of an object to be measured.

[0002]

2. Description of the Related Art In recent years, power semiconductor switching elements such as diodes and thyristors are often used directly connected to a power supply, and a large amount of harmonic current is generated for these elements. It causes various obstacles to peripheral devices. With the increase of such harmonic generation devices, it is necessary to suppress the harmonics generated from extra high voltage or high voltage consumers. In September 1994, the Agency for Natural Resources and Energy, Ministry of International Trade and Industry said, Guideline for Measures to Suppress Harmonics for Consumers "has been issued. For this reason, efforts have been made to measure harmonics from various types of load devices and to understand the actual conditions thereof before introducing harmonic suppression devices, and to suppress the levels below the levels indicated in the guidelines for harmonic suppression measures.

However, even if harmonics are generated from various load devices or harmonics flow in from a power supply system, these load devices or their peripheral devices are not directly affected. Houses seem to be less aware of harmonic countermeasures. In other words, if harmonic suppression equipment is introduced and harmonics are suppressed in accordance with the guidelines for harmonic suppression measures, the power supply quality of the power supply system can be improved, but generally only capital investment is required for customers, No direct merit can be found from the introduction of the harmonic suppression device, and as a result, no positive attitude to harmonic countermeasures has been found at present. In addition, conventional harmonic measuring instruments used when performing harmonic suppression measures are:
It is mainly to analyze the harmonics generated by the measurement target or the harmonics flowing into the measurement target.Therefore, the harmonics of each order are actually measured, and the content rate is measured.
In most cases, the direction of inflow and outflow of harmonics is analyzed.

For example, in a harmonic power integrator described in Japanese Patent Application Laid-Open No. 07-128377, current detecting means for detecting a current flowing from a private system to a power system, and an output of the current detecting means as an input. Harmonic detection means,
Effective value calculating means having the output of the harmonic detecting means as input, harmonic power integrator means having the output of the effective value calculating means as input, and display means for displaying the output of the harmonic power integrating means. In addition, the effective value of the harmonic power flowing out to the power supply system is integrated and displayed. With such a configuration, the effective value of the harmonic current flowing from the private system to the power supply system is obtained, and the integrated value is displayed, thereby continuously measuring the amount of harmonic power flowing out in an arbitrary period, It is possible to monitor.

[0005]

However, in the above-mentioned conventional measuring device, only the amount of harmonic power and the content thereof are required, and what kind of advantage can be obtained for the customer by taking the harmonic suppression measures? There was nothing to show. Therefore, introduction of expensive harmonic measurement equipment and harmonic suppression equipment,
Alternatively, it has been difficult to make an active effort to suppress the outflow of harmonics from the load device itself.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a harmonic measuring instrument capable of displaying an effect for a customer obtained by implementing a measure for suppressing harmonics in terms of electric energy or money. The aim is to introduce more aggressive harmonic suppression equipment.

[0007]

In order to achieve this object, a harmonic measuring apparatus according to the first aspect of the present invention comprises an electric power of only a harmonic component of a commercial frequency from an input voltage and an input current of an object to be measured. And an estimated harmonic power amount measuring means for estimating the power amount of only the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring means. is there. With this configuration, it is possible to measure the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period.

According to a second aspect of the present invention, there is provided a harmonic measuring device, wherein the harmonic power measuring means is configured to perform a fast Fourier transform from an input voltage and an input current of an object to measure an electric energy of only a harmonic component of a commercial frequency. 2. The apparatus configuration according to claim 1, wherein the apparatus is configured to measure the weight of the apparatus. With this configuration, it is possible to measure the accumulated power amount of the harmonic power amount flowing into and out of the measurement object up to the present and the estimated power amount after a predetermined period, and it is possible to perform all the harmonic power amount measurement by the CPU.

According to a third aspect of the present invention, there is provided the harmonic measuring device, wherein the harmonic power amount measuring means and the estimated harmonic power amount measuring means are capable of measuring by any order. Configuration. With this configuration, it is possible to measure the accumulated power amount of the harmonic power amount flowing into and out of the measurement object up to the present and the estimated power amount after a predetermined period for each arbitrary order.

According to a fourth aspect of the present invention, there is provided a harmonic measuring device, wherein a filter means for cutting off a fundamental frequency of a commercial frequency from an input voltage and an input current of an object to be measured, and the fundamental wave is cut off by the filter means. A harmonic power meter that measures only the power component of the commercial frequency from the input voltage and the input current, and only the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power meter. This is a configuration in which estimated harmonic power amount measuring means for estimating the power amount is provided. With this configuration, it is possible not only to measure the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured until now and the estimated power amount after a predetermined period, but also to use a downgraded CPU.

[0011] Further, the harmonic measuring device according to claim 5 of the present invention is a fundamental wave electric energy measuring means for measuring an electric energy of a fundamental wave of a commercial frequency from an input voltage and an input current of an object to be measured,
Total electric energy metering means for measuring the electric energy including all of the fundamental and harmonic components of the commercial frequency from the input voltage and the input current, and data of the fundamental electric energy measuring means from the data of the total electric energy measuring means. And a harmonic power amount measuring means for measuring the electric power amount of only the harmonic component of the commercial frequency by subtracting the electric power amount of only the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring means. Is provided with estimated harmonic power amount measuring means for estimating the power.
With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the measurement target until now and the estimated power amount after a predetermined period, but also has a function as a normal power amount measurement device.

According to a sixth aspect of the present invention, there is provided a harmonic measuring device, wherein the fundamental electric energy measuring means measures the electric energy of the fundamental wave of the commercial frequency by fast Fourier transform from the input voltage and the input current of the object to be measured. An apparatus configuration according to claim 5 as means for performing the operation. With this configuration, it is possible to more accurately measure the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period, and also has a function as a normal power amount measurement device. In addition, the measurement of the fundamental wave electric energy can be entirely performed by the CPU.

According to a seventh aspect of the present invention, there is provided a harmonic wave measuring apparatus, wherein the fundamental wave electric power measuring means measures the electric power of the commercial frequency fundamental wave from the input voltage and the input current of the object to be measured. Means, and the total power amount measuring means as total power measuring means for measuring power including all of the fundamental and harmonic components of the commercial frequency from the input voltage and input current,
6. The harmonic power metering means is means for integrating data obtained by subtracting the data of the fundamental power measuring means from the data of the total power measuring means to measure the power quantity of only the harmonic component of the commercial frequency. It is an apparatus configuration of description. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period, but also the instantaneous values of the fundamental power and the total power.

In the harmonic measuring apparatus according to an eighth aspect of the present invention, the fundamental wave power meter measures the power in the fundamental wave of the commercial frequency from the input voltage and the input current of the object to be measured by fast Fourier transform. An apparatus configuration according to claim 7, which is used as fundamental wave power measurement means. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the measurement target until now and the estimated power amount after a predetermined period, but also the instantaneous values of the fundamental power and the total power, All of the fundamental power measurement can be performed by the CPU.

According to a ninth aspect of the present invention, there is provided a harmonic measuring apparatus, comprising: a filter for cutting off a harmonic component of a commercial frequency from an input voltage and an input current of an object to be measured; Fundamental wave power metering means for measuring the power amount of the fundamental frequency of the commercial frequency from the interrupted input voltage and input current; and the fundamental frequency and the harmonics of the commercial frequency from the input voltage and the input current at the preceding stage of the filter means. A total electric energy measuring means for measuring the electric energy including all the components, and an electric energy of only the harmonic component of the commercial frequency by subtracting the data of the fundamental wave electric energy measuring means from the data of the total electric energy measuring means. And an estimated harmonic power amount for estimating the power amount of only the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measurement unit. It is a structure in which a quantity unit. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the measurement target until now and the estimated power amount after a predetermined period, but also has a function as a normal power amount measurement device.

According to a tenth aspect of the present invention, there is provided a harmonic measuring device according to the tenth aspect, wherein a fundamental wave electric energy measuring means is configured to convert a fundamental wave of a commercial frequency from the input voltage and the input current whose harmonic components are cut off by the filter means. Comprehensive power measurement means for measuring fundamental power measuring means for measuring electric power, and measuring total electric energy measuring means for measuring electric power including all fundamental waves and harmonic components of a commercial frequency from the input voltage and input current at the preceding stage of the filter means. Means, and the harmonic power amount measuring means is means for integrating the data obtained by subtracting the data of the fundamental power measuring means from the data of the total power measuring means and measuring the power amount of only the harmonic component of the commercial frequency. An apparatus configuration according to claim 9. With this configuration, in addition to the measurement of the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period and the function as a normal power amount measurement device, the fundamental wave power The instantaneous value of power can also be measured.

According to another aspect of the present invention, there is provided a harmonic measuring apparatus, comprising: an electric charge unit price setting unit for setting a unit price of an electric charge; and an electric charge and estimated harmonic power set by the electric charge unit price setting unit. The electric power calculating means for estimating an electric charge of only the electric power of the harmonic component of the commercial frequency after a predetermined period from the estimated electric power of the harmonics measured by the electric power measuring means. An apparatus configuration according to any one of Claims 10 to 10. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period, but also the electricity rate of the estimated harmonic power amount after the predetermined period. be able to.

According to a twelfth aspect of the present invention, there is provided a harmonic measuring apparatus for setting a unit price of an electricity bill, and an electricity bill and an estimated harmonic power set by the electricity bill unit. An estimated electricity rate calculating means for estimating the electricity rate of the power quantity of the harmonic component of an arbitrary order of the commercial frequency after a predetermined period from the estimated harmonic power quantity measured for each order by the quantity measuring means. 3 is an apparatus configuration according to 3. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured until now and the estimated power amount after the predetermined period for any order, but also the estimated harmonics for any order after the predetermined period. The electricity rate of the electric energy can also be measured.

Further, according to a thirteenth aspect of the present invention, there is provided a harmonic measuring apparatus for setting a unit price of an electricity bill, and an electricity bill and a harmonic power meter set by the electricity bill unit. 5. An electric charge calculating means for calculating an electric charge of a cumulative electric energy of harmonics up to the present time from the electric energy measured by the means.
12. The device configuration according to any one of items 1 to 11. With this configuration, it is possible to measure not only the accumulated power amount of the harmonic power amount flowing into and out of the object to be measured and the estimated power amount after a predetermined period, but also the electric charge of the accumulated power amount of the harmonic power amount up to the present time. Can be measured.

Further, according to a fourteenth aspect of the present invention, there is provided a harmonic measuring apparatus, wherein an electricity rate unit price setting means for setting an electricity rate unit price, and an electricity rate and a harmonic power amount set by the electricity rate unit price setting means. 13. The electricity rate calculating means according to claim 3, further comprising: an electricity rate calculating means for calculating an electricity rate of a cumulative power amount of a harmonic of an arbitrary order up to the present time from the electric energy measured by an arbitrary order by the measuring means. This is the device configuration. With this configuration, not only can the accumulated power amount of the harmonic power flowing into and out of the object to be measured to the present and the estimated power after a predetermined period be measured by any order, but also the harmonic power by the arbitrary order up to the present. Can also be measured.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of a harmonic measuring apparatus according to a first embodiment of the present invention. The measurement object 1 is a measurement object for performing harmonic measurement, and includes, for example, an inverter power supply, an inverter-controlled motor, a thyristor-equipped device, a private power generator, and the like, and an electric path from the power system to these devices. PT2 of the instrument transformer and CT3 of the instrument current transformer are an instrument transformer and an instrument current transformer for measuring the input voltage and input current of the measuring object 1. The harmonic power amount measuring means 4 is a measuring means for measuring the power amount of only the harmonic component of the commercial frequency from the input voltage and the input current. Estimated harmonic power amount measuring means 5
Is a means for estimating the power amount of only the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring unit 4.

The electricity rate unit setting means 6 is a means for arbitrarily setting the electricity rate unit price. The electricity rate calculation means 7 calculates the electricity rate of the accumulated power amount of the harmonic component up to the present time from the electricity rate set by the electricity rate unit price setting means 6 and the electric energy measured by the harmonic power amount measurement means 4. Is a means for calculating Estimated electricity bill calculation means 8
The electricity rate set by the electricity rate unit setting means 6,
It is a calculating means for estimating, from the estimated harmonic power amount measured by the estimated harmonic power amount measuring means 5, an electricity rate of only the estimated power amount of the harmonic component of the commercial frequency after a predetermined period.

Here, the harmonic power amount measuring means 4 is composed of an AD converter and a CPU, and the estimated harmonic power amount measuring means 5
And the electricity rate calculation means 7 and the estimated electricity rate calculation means 8 are constituted by a CPU.
PU, digital switch, 7-segment LED display,
It consists of a liquid crystal display and operation switches.

The operation of the harmonic measuring instrument configured as described above will be described with reference to FIG. First, in order to measure the power of the measurement target 1 as a measurement target, the PT2 and CT3 are connected to the power supply line of the measurement target 1, and the voltage and the current are respectively converted into signals suitable for measurement. The converted output voltage of PT2 and the output current of CT3 are input to the harmonic power amount measuring means 4, and the harmonic power amount measuring means 4
Then, the power of the order other than the fundamental wave of the commercial frequency is calculated by the fast Fourier transform, and all the orders are added to calculate the power of only the harmonic component of the commercial frequency. Further, the power amount of only the harmonic component of the commercial frequency is measured by integrating the calculated power. The power amount of only the harmonic component of the commercial frequency calculated by the harmonic power amount measuring unit 4 is input to the estimated harmonic power amount measuring unit 5, and the estimated harmonic power amount measuring unit 5 calculates the power amount based on the power amount. Then, the estimated power amount of only the harmonic component of the commercial frequency after a predetermined period is calculated.

As the estimation of the electric energy by the estimated harmonic electric energy measuring means 5, the electric energy after a predetermined period can be estimated from the variation of the electric energy during a certain period. When the electric energy of only the component is 10 kWh per day, 10 kWh × 31 days = 310 kWh in one month,
In one year, it is simply calculated as the product of the measured value of the harmonic power for a certain period, such as 3650 kWh, and the specified period, or the harmonic value after the specified period is calculated by the neuro or fuzzy inference from the measured value of the harmonic power in the past. It is also possible to estimate by calculating the amount of wave power, and any means may be used as the realizing means.

Further, the unit price of the electricity rate is set by the unit price setting means 6 for electricity, and the electricity rate calculating means 7 calculates the unit price of the electricity rate and the electric energy measured by the harmonic power amount measuring means 4. Calculate the electricity rate of the accumulated power amount of the harmonic component up to the present. Similarly, the estimated electricity bill calculating means 8 calculates the commercial electricity after a predetermined period from the electricity bill unit price set by the electricity bill unit setting means 6 and the estimated harmonic power amount measured by the estimated harmonic power metering means 5. Calculate the electricity rate of the estimated power amount of only the harmonic component of the frequency. These calculated values are displayed on a display device together with other measured values such as the content of harmonics, or are printed and displayed by a printer.

By using the harmonic measuring device of the first embodiment as described above, the accumulated power amount of the useless harmonic power which deteriorates the power supply quality up to the present time, the one month or one year, etc. It is possible to display the estimated power amounts and their amounts. By using these data, for example, when a harmonic suppression device such as an active filter is introduced, it is possible to grasp not only the amount of unnecessary reduction of the amount of harmonic power but also the effect as the amount of money. As a result, when introducing the harmonic suppression device, it is possible to determine the optimal device introduction from the cost-effectiveness.

The unit price setting unit 6 can set various unit prices such as a nighttime charge and a seasonal charge, and can calculate the electric charge based on the unit price. Further, the electricity rate unit 6 can be set by communication.
Further, in the present embodiment, the harmonic power amount measuring means 4 is obtained by the fast Fourier transform, but any other realizing means may be used. Furthermore, the amount of harmonic power and the electricity rate can be measured for each order, and it is possible to determine which order of harmonics is optimal in terms of cost-effectiveness.

In the first embodiment, the electric charge calculating means 7 calculates the electric charge up to the present and the estimated electric charge calculating means 8 calculates the estimated electric charge after a predetermined period. Instead of providing the calculating means 7 and the estimated electricity charge calculating means 8, only a measuring instrument for measuring the estimated harmonic power may be used, and either the electricity bill calculating means 7 or the estimated electricity bill calculating means 8 is added. A configuration may be used. In addition, the amount of harmonic power can be measured for each outflow or inflow to the measurement object 1, and it is also possible to evaluate whether the measurement object itself is deteriorating the power supply quality or whether the quality is being caused. . Furthermore, in the first embodiment, the measurement target 1 is one circuit, but may be a plurality of circuits.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to the block diagram of FIG. The measurement object 9 is a measurement object for performing harmonic measurement, and includes, for example, an inverter power supply, an inverter-controlled motor, a thyristor-mounted device, a private power generator, and the like, and also an electric path from the power system to these devices. The instrument transformer PT10 and the instrument current transformer CT11 are an instrument transformer and an instrument current transformer for measuring the input voltage and the input current of the object 9 to be measured. The filter unit 12 blocks a commercial frequency fundamental wave of the input voltage, and the filter unit 13 blocks a commercial frequency fundamental wave of the input current. The harmonic power amount measuring means 14 is a means for measuring the power amount of only the harmonic component of the commercial frequency from the output voltage of the filter means 12 and the output current of the filter means 13. The estimated harmonic power amount measuring unit 15 is a measuring unit for estimating only the power amount of the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring unit 14.

The electricity rate unit setting means 16 is a means for arbitrarily setting the electricity rate unit price. The electricity rate calculation means 17 calculates the electricity rate of the accumulated power amount of the harmonics up to the present time from the electricity rate set by the electricity rate unit price setting means 16 and the power amount measured by the harmonic power amount measurement means 14. It is a means for calculating. Estimated electricity bill calculation means 1
8 is an estimation of only the harmonic component of the commercial frequency after a predetermined period from the electricity rate set by the electricity rate unit price setting means 16 and the estimated harmonic power amount measured by the estimated harmonic power amount measuring means 15. It is a calculating means for estimating the electricity rate of the electric energy.

Here, the harmonic power amount measuring means 14 is an AD converter.
The estimated harmonic power amount measuring means 15, the electricity rate calculating means 17, and the estimated electricity rate calculating means 18 are constituted by a CPU, and the electricity rate unit setting means 16 is constituted by a CPU, a digital switch, and a 7-segment. L
It is composed of an ED display, a liquid crystal display and operation switches.

The operation of the harmonic measuring instrument configured as described above will be described with reference to FIG. In order to measure the power of the measurement object 9 that is the measurement object, the measurement object 9 is measured.
PT10 and CT11 are connected to the power supply line of, and the voltage and the current are respectively converted into signals suitable for measurement. The converted output voltage of PT10 and output current of CT11 are input to filter means 12 and filter means 13, respectively. The filter unit 12 and the filter unit 13 function as a high-pass filter in the second embodiment, and pass signals of orders other than the fundamental wave of the commercial frequency. The output voltage of the filter unit 12 and the output current of the filter unit 13 are input to the harmonic power amount measuring unit 14, and the harmonic power amount measuring unit 14 measures the power in the same manner as a normal effective value is obtained. As a result, power of only the harmonic component of the commercial frequency is obtained. The power thus obtained is integrated, and the power amount of only the harmonic component of the commercial frequency is measured. The subsequent operation is the same as in the first embodiment, and a description thereof will not be repeated.

By using the above-described harmonic measuring instrument according to the second embodiment, it is possible to estimate the accumulated value of the useless harmonic power that deteriorates the power supply quality up to the present time, a predetermined period such as one month or one year. It is possible to display the amount of power and their amount. By using these data, for example, when a harmonic suppression device such as an active filter is introduced, it is possible to grasp not only the amount of unnecessary reduction of the amount of harmonic power but also the effect as the amount of money. As a result, when introducing the harmonic suppression device, it is possible to determine the optimal device introduction from the cost-effectiveness.

In the second embodiment, the filter means 1
2 and the filter means 13 to cut off only the fundamental wave of the commercial frequency, the harmonic power amount measuring means 14 can measure the harmonic power in the same manner as a normal effective value is obtained. The grade of the CPU used can be reduced as compared with the case of using the Fourier transform, and the degree of freedom in circuit design can be increased.

The unit price setting unit 16 can set various unit prices such as a nighttime charge and a seasonal charge, and can set an electric charge based on the unit price. Further, the electricity rate unit setting means 16 can be set by communication.

Further, in the second embodiment, the electric charge calculating means 17 has a measuring instrument configuration for obtaining the electric charge up to now and the estimated electric charge calculating means 18 up to the estimated electric charge after a predetermined period. A device configuration for measuring the estimated amount of harmonic power without providing the means 17 and the estimated electricity charge calculating means 18 may be used, or a device configuration to which either the electricity bill calculating means 17 or the estimated electricity bill calculating means 18 is added may be used. Good.

Further, the amount of harmonic power can be measured for each outflow or inflow to the object 9 to be measured, and it is also possible to evaluate whether or not the object itself is deteriorating the power supply quality or whether it is caused to be degraded. It is possible. Furthermore, in the second embodiment, the measurement object 9 is one circuit, but may be a plurality of circuits.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIG. The measurement object 19 is a measurement object for performing harmonic measurement, and includes, for example, an inverter power supply, an inverter-controlled motor, a thyristor-mounted device, a private power generator, and the like, and also an electric path from the power system to these devices. The instrument transformer PT20 and the instrument current transformer CT21 are an instrument transformer and an instrument current transformer for measuring the input voltage and the input current of the object 19 to be measured. The fundamental wave power metering means 22 is a means for measuring the power amount of only the fundamental wave of the commercial frequency from the input voltage and the input current by fast Fourier transform. The total electric energy measuring means 23 is an electric power measuring means for measuring the electric energy including all of the fundamental and the harmonic components of the commercial frequency from the input voltage and the input current.

The harmonic power metering means 24 subtracts the data of the fundamental power metering means 22 from the data of the total power metering means 23 to measure the power of only the harmonic component of the commercial frequency. It is. The estimated harmonic power amount measuring means 25 is means for estimating only the power amount of the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring means 24.

The electricity rate unit price setting means 26 is a means for arbitrarily setting the electricity rate unit price. Electricity charge calculation means 2
Numeral 7 is a means for calculating the electric charge of the accumulated electric energy of the harmonic up to the present time from the electric charge set by the electric charge unit price setting means 26 and the electric energy measured by the harmonic electric energy measuring means 24. is there. The estimated electricity bill calculating means 28
Based on the electricity rate set by the electricity rate unit price setting means 26 and the estimated harmonic power amount measured by the estimated harmonic power amount measuring means 25, the electric energy of only the harmonic component of the commercial frequency after a predetermined period is obtained. It is a calculating means for estimating a fee.

Here, the fundamental power amount measuring means 22 and the total power amount measuring means 23 are constituted by an AD converter and a CPU, and include a harmonic power amount measuring means 24, an estimated harmonic power amount measuring means 25, an electricity rate calculation. The means 27 and the estimated electricity rate calculating means 28 are constituted by a CPU, and the electricity rate unit setting means 26 is constituted by a CPU, a digital switch, a 7-segment LED display, a liquid crystal display, an operation switch and the like.

The operation of the harmonic measuring instrument configured as described above will be described with reference to FIG. In order to measure the power of the measurement object 19 to be measured, the PT 20 and the CT 21 are connected to the power line of the measurement object 19, and the voltage and the current are converted into signals suitable for the measurement, respectively.
The converted output voltage of the PT 20 and the output current of the CT 21 are input to the fundamental power amount measuring unit 22 and the total power amount measuring unit 23, respectively. The fundamental wave power meter 22 calculates the power of only the fundamental frequency of the commercial frequency from the output voltage of the PT 20 and the output current of the CT 21 by fast Fourier transform. By integrating the calculated power, the power amount of only the fundamental wave of the commercial frequency is measured.

The total power metering means 23 calculates the power of the ordinary effective value from the output voltage of the PT 20 and the output current of the CT 21, and calculates the power including all of the fundamental and harmonic components of the commercial frequency. By integrating the calculated power, the amount of power including all of the fundamental and harmonic components of the commercial frequency is measured. Then, the harmonic power amount measuring means 24
Then, the power amount of only the fundamental wave of the commercial frequency measured by the fundamental power amount measurement unit 22 is calculated from the power amount including the fundamental wave and all the harmonic components of the commercial frequency measured by the total power amount measurement unit 23. By subtraction, the electric energy of only the harmonic component of the commercial frequency is measured. The subsequent operation is the same as in the first embodiment, and a description thereof will not be repeated.

In this embodiment, the total power amount is measured by the total power amount measuring means 23 and the fundamental wave power amount is measured by the fundamental power amount measuring means 22. The power measuring unit and the fundamental wave power measuring unit 22 may be used as the fundamental wave power measuring unit. Hereinafter, a case where the measurement is performed by this method will be described. The fundamental power measuring means performs a fast Fourier transform from the output voltage of the PT 20 and the output current of the CT 21 to calculate the power of the fundamental wave of the commercial frequency, and measures the power of only the fundamental wave of the commercial frequency. The total power measuring means calculates a power having a normal effective value from the output voltage of the PT 20 and the output current of the CT 21 and measures the power including all of the fundamental and harmonic components of the commercial frequency. Next, in the harmonic power amount measuring means 24, the fundamental frequency of the commercial frequency measured by the total power measuring means and the power including all the harmonic components are converted from the fundamental frequency of the commercial frequency measured by the fundamental power measuring means. The power of only the harmonic component is calculated by subtracting the power of only the harmonic component, and the power of only the harmonic component of the commercial frequency is measured by integrating the calculated power.
The operation after measuring the electric energy of only the harmonic component is the same as in the first embodiment.

By using the harmonic measuring instrument of the present embodiment as described above, the accumulated value of the useless harmonic power that deteriorates the power supply quality up to the present time, the estimated power for a predetermined period such as one month or one year, etc. Amounts and their amounts can be displayed. further,
In the third embodiment, since the total electric energy can be measured, it can be used as a normal electric energy measuring device. In addition, the harmonic measuring device using the fundamental power measuring means and the total power measuring means as the fundamental power measuring means and the total power measuring means respectively can further measure the instantaneous values of the fundamental power and the total power. . By using these data, for example, when a harmonic suppression device such as an active filter is introduced, it is possible to grasp not only the amount of unnecessary reduction of the amount of harmonic power but also the effect as the amount of money. As a result, when introducing the harmonic suppression device, it is possible to determine the optimum device introduction from the cost-effectiveness.

The unit price setting unit 26 can set various unit prices such as a nightly charge and a seasonal charge, and can set the electric charge based on the unit price. Further, the electricity rate unit setting means 26 can be set by communication. Further, in the present embodiment, the harmonic power amount measuring means 4 is obtained by the fast Fourier transform, but any other realizing means may be used. Furthermore, the amount of harmonic power and the electricity rate can be measured for each order, and it is possible to determine which order of harmonics is optimally installed in terms of cost-effectiveness.

Further, in the third embodiment, the electric charge calculating means 27 is configured to measure the electric charge up to the present and the estimated electric charge calculating means 28 to the estimated electric charge after a predetermined period. Only the measuring instrument configuration for measuring the estimated harmonic power amount without providing the means 27 and the estimated electricity bill calculating means 28 may be used, or a configuration in which either the electricity bill calculating means 27 or the estimated electricity bill calculating means 28 is added. Good.

Also, the amount of harmonic power can be measured separately for outflow or inflow to the measurement object 19, and it is also possible to evaluate whether the measurement object itself is deteriorating the power supply quality or whether it is caused to be degraded. It is possible. Furthermore, in the present embodiment, the measurement object 19 is one circuit, but may be a plurality of circuits.

(Embodiment 4) A fourth embodiment of the present invention will be described with reference to FIG. The measurement object 1 is a measurement object for performing harmonic measurement, and includes, for example, an inverter power supply, an inverter-controlled motor, a thyristor-equipped device, a private power generator, and the like, and an electric path from the power system to these devices. The instrument transformer PT30 and the instrument current transformer CT31 are an instrument transformer and an instrument current transformer for measuring the input voltage and the input current of the measuring object 29. The filter means 32 cuts off the harmonic component of the commercial frequency in the input voltage, and the filter means 33 cuts off the harmonic component of the commercial frequency in the input current. The fundamental wave power amount measuring means 34 is
And a unit for measuring the electric energy of the fundamental wave of the commercial frequency from the input voltage and the input current from which the harmonic components are cut off by the filter unit 33.

The total electric energy measuring means 35 is an electric power measuring means for measuring the electric energy including all the fundamental and harmonic components of the commercial frequency from the input voltage and the input current. The harmonic power amount measuring means 36 subtracts the data of the fundamental power amount measuring means 34 from the data of the total power amount
This is a means for measuring the electric energy of only the harmonic component of the commercial frequency. The estimated harmonic power amount measuring means 37 is means for estimating only the power amount of the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring means 36.

The electricity rate unit price setting means 38 is a means for arbitrarily setting the electricity rate unit price.
Is a means for calculating the electric charge of the accumulated electric power of the harmonic up to the present from the electric charge set by the electric charge unit price setting means 38 and the electric energy measured by the harmonic electric energy measuring means 36. The estimated electricity rate calculation means 40 calculates a harmonic of the commercial frequency after a predetermined period from the electricity rate set by the electricity rate setting means 38 and the estimated harmonic power amount measured by the estimated harmonic power amount measurement means 37. It is a calculating means for estimating the electricity bill of the electric energy of only the component.

Here, the fundamental wave power meter 34 and the total power meter 35 are composed of an AD converter and a CPU. The harmonic power meter 36, the estimated harmonic power meter 37, the electricity rate calculator The means 39 and the estimated electricity rate calculating means 40 are constituted by a CPU, and the electricity rate unit setting means 38 is constituted by a CPU, a digital switch, a 7-segment LED display, a liquid crystal display, an operation switch and the like.

The operation of the harmonic measuring instrument configured as described above will be described with reference to FIG. In order to measure the power of the measurement target 29 to be measured, the PT 30 and the CT 31 are connected to the power supply line of the measurement target 29, and the voltage and the current are respectively converted into signals suitable for measurement.
The converted output voltage of PT30 and output current of CT31 are input to filter means 32, filter means 33, and total electric energy metering means 35, respectively. When the output voltage of the PT 30 is input to the filter means 32, in the present embodiment, the filter means 32 functions as a low-pass filter, so that the signal of the fundamental wave of the commercial frequency passes. CT31
Is input to the filter means 33, the filter means 33 also functions as a low-pass filter, so that the signal of the fundamental wave of the commercial frequency passes. The output voltage of the filter means 32 and the output current of the filter means 33 are input to the fundamental wave power metering means 34. If the fundamental wave power metering means 34 obtains the power in the same manner as the usual effective value, it is commercially available. Power of only the fundamental wave of the frequency is required.
By integrating this power, the power amount of only the fundamental wave of the commercial frequency is measured.

The total power metering means 35 calculates the power of the ordinary effective value from the output voltage of the PT 30 and the output current of the CT 31, and calculates the power including all of the fundamental and the harmonic components of the commercial frequency. By integrating the calculated power, the amount of power including all of the fundamental and harmonic components of the commercial frequency is measured. Then, the harmonic power amount measuring means 36
Then, the power amount of only the fundamental frequency of the commercial frequency measured by the fundamental power amount measuring unit 34 is calculated from the power amount including the fundamental wave and all the harmonic components of the commercial frequency measured by the total power amount measuring unit 35. By subtraction, the electric energy of only the harmonic component of the commercial frequency is measured. The subsequent operation is the same as in the first embodiment, and a description thereof will not be repeated.

In the present embodiment, by subtracting the electric energy measured by the fundamental electric energy measuring means 34 from the electric energy measured by the total electric energy measuring means 35, only the harmonic component of the commercial frequency is obtained. Is measured, the fundamental power measurement means 34 may be used as the fundamental power measurement means, and the total power measurement means 35 may be used as the total power measurement means. Hereinafter, a case where the measurement is performed by this method will be described. In the fundamental power measuring means, the output voltage of the PT 30 and the output current of the CT 31 are inputted with the harmonic components cut off by the filter means 32 and the filter means 33, respectively, and the power of only the fundamental wave of the commercial frequency is measured. In the total power measuring means 35,
The power of the normal effective value is calculated from the output voltage of the PT 30 and the output current of the CT 31 to measure the power including all the fundamental and harmonic components of the commercial frequency. Next, in the harmonic power amount measuring means 36, from the power including all of the fundamental wave and the harmonic components of the commercial frequency measured by the total power measuring means,
The power of only the fundamental wave of the commercial frequency measured by the fundamental wave power measuring means is subtracted, and the power of only the harmonic component is calculated,
By integrating the calculated power, the power amount of only the harmonic component of the commercial frequency can be measured. The operation after measuring the electric energy of only the harmonic component is the same as in the first embodiment.

By using the harmonic measuring instrument of the fourth embodiment as described above, the accumulated power amount of the useless harmonic power that deteriorates the power supply quality up to the present time, such as one month or one year, can be obtained. It is possible to display the estimated power amounts and their amounts. Further, in the fourth embodiment, since the total electric energy can be measured, it can be used as a normal electric energy measuring device. Also,
The harmonic measuring device using the fundamental power measuring means and the total power measuring means as the fundamental power measuring means and the total power measuring means, respectively, can also measure the instantaneous values of the fundamental power and the total power. By using these data, for example, when a harmonic suppression device such as an active filter is introduced, it is possible to grasp not only the amount of unnecessary reduction of the amount of harmonic power but also the effect as the amount of money. As a result, when introducing the harmonic suppression device, it is possible to determine the optimum device introduction from the cost-effectiveness.

Further, when the electric energy is calculated by the CPU, the use of the fast Fourier transform increases the load on the CPU and requires a higher-grade CPU. However, the use of the filter means eliminates the need for the fast Fourier transform. It is also possible to reduce the grade of the CPU, thereby increasing the degree of freedom in circuit design.

The unit price setting unit 38 can set various unit prices such as a nightly charge and a seasonal charge, and can set an electric charge based on the unit price. Further, the electricity rate unit setting means 38 can be set by communication. Further, in the present embodiment, the harmonic power amount measuring means 4 is obtained by the fast Fourier transform, but any other realizing means may be used. Furthermore, the amount of harmonic power and the electricity rate can be measured for each order, and it is possible to determine which order of harmonics is optimally installed in terms of cost-effectiveness.

Further, in the fourth embodiment, the electric charge calculating means 39 is configured to measure the electric charge up to the present and the estimated electric charge calculating means 40 to the estimated electric charge after a predetermined period. Only the measuring instrument configuration for measuring the estimated harmonic power amount without providing the means 39 and the estimated electricity bill calculating means 40 may be used, or a configuration in which either the electricity bill calculating means 39 or the estimated electricity bill calculating means 40 is added. Good.

Further, the amount of harmonic power can be measured separately for outflow or inflow to the measurement object 29, and it is also possible to evaluate whether the measurement object itself is deteriorating the power supply quality or whether it is caused to be degraded. It is possible. Furthermore, in the fourth embodiment, the measurement object 29 is one circuit, but may be a plurality of circuits.

[0063]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, the provision of the harmonic power amount measuring means and the estimated harmonic power amount measuring means in the harmonic measuring device not only measures the harmonics but also reduces the commercial frequency. By measuring the power amount of only the harmonic components of, the cumulative value of the useless harmonic power that degrades the power supply quality, or assuming that it has changed for a predetermined period as it is,
It is possible to estimate the harmonic power amount during that period. Therefore, when the harmonic suppression device is introduced, not only the power quality of the power supply system can be improved, but also the effect of power saving by the introduction can be estimated, so that a great effect of promoting a measure for suppressing the harmonic is obtained.

According to the invention of claim 2 of the present invention, since the harmonic power amount measuring means is realized by the fast Fourier transform, the entire power amount can be obtained by the calculation of the CPU. This has the effect of reducing the number of circuit components and realizing a highly reliable harmonic measuring instrument.

Further, according to the third aspect of the present invention,
The harmonic power measurement means is realized by the fast Fourier transform and measured by an arbitrary order.In addition to the above-mentioned effects, when it is difficult to introduce a device that further measures all harmonic components, There is also obtained an effect that an effective harmonic component of a specific order can be efficiently selected and countermeasures taken.

According to a fourth aspect of the present invention, the quality of the power supply is reduced by measuring the amount of power of only the harmonic component from the voltage and current obtained by cutting off the fundamental wave of the commercial frequency using a filter. It is possible to estimate the accumulated value of the useless harmonic power or the amount of the harmonic power in that period when it is assumed that the value has changed for a predetermined period in the current state. Therefore,
When a harmonic suppression device is introduced, not only the power supply quality of the power supply system can be improved, but also the effect of power saving by the introduction can be estimated, so that a great effect of promoting a measure for suppressing harmonics can be obtained. Furthermore, C for calculating the harmonic power amount
The effect of increasing the degree of freedom in designing harmonic measurement equipment can be obtained by lowering the grade of PU.

The invention according to claim 5 of the present invention is characterized in that a means for measuring the amount of harmonic power from the difference between the data of the total power meter and the data of the fundamental power meter is provided. Accumulated value of useless harmonic power that lowers the quality,
It is possible to estimate the harmonic power amount during that period. Therefore, when the harmonic suppression device is introduced, not only the power quality of the power supply system can be improved, but also the effect of power saving by the introduction can be estimated, so that a great effect of promoting a measure for suppressing the harmonic is obtained. In addition, a function as a normal electric energy meter is obtained.

According to the invention of claim 6 of the present invention, the same effect as the invention of claim 5 can be obtained by measuring the electric power of the fundamental wave of the commercial frequency by the fast Fourier transform. In addition, since the fundamental wave power can be calculated entirely by the CPU, the number of circuit components can be reduced, and a highly reliable harmonic measuring instrument can be realized.

Further, according to the invention of claim 7 of the present invention, the fundamental power measuring means is used as fundamental power measuring means, and the total power measuring means is used as total power measuring means. By measuring the amount, not only the same effect as the invention according to claim 5 can be obtained, but also the instantaneous power value of the effective value and the instantaneous power value of the fundamental wave of the commercial frequency can be measured, and analysis of various instantaneous value fluctuations. It has an excellent effect that it can also be used.

Further, the invention according to claim 8 of the present invention provides:
Since the fundamental wave power is measured using the fast Fourier transform, in addition to the same effect as that of the invention described in claim 7, the fundamental wave power can be measured entirely by the calculation of the CPU. Can be reduced, and an effect of realizing a highly reliable harmonic measurement device can be obtained.

According to the ninth aspect of the present invention, the fundamental electric power is measured from the voltage and the current obtained by cutting off the harmonic component of the commercial frequency using a filter, and the total electric energy is measured by an ordinary method. Since the power of harmonics is measured from these data, it is possible to estimate not only the cumulative value of the power of the harmonics that is degrading the power supply quality but also the power of the harmonics for a predetermined period, and use a filter. Can lower the grade of the CPU used for the fundamental wave power metering means,
The degree of freedom in designing harmonic measurement equipment can be increased. In addition, there is an excellent effect that a function as a normal electric energy meter is obtained.

Further, according to the tenth aspect of the present invention, a fundamental wave power is measured from a voltage and a current obtained by cutting off a harmonic component of a commercial frequency using a filter, and the fundamental wave power is measured from the voltage and the current before passing through the filter. Since the total power is measured and the harmonic power amount is measured from these data, not only the same effect as the invention according to claim 9 can be obtained, but also the instantaneous power value of the effective value and the commercial value can be obtained. The power instantaneous value of the fundamental wave of the frequency can also be measured, and various instantaneous value fluctuations can be analyzed.

The invention according to claim 11 of the present invention provides
From the estimated harmonic power and the electricity rate set by the unit price setting means, the estimated harmonic power after a predetermined period can be displayed in monetary value. Not only the cumulative value and estimated value of electricity but also the estimated value of money.Even if the electricity rate is revised, it can be handled by the electricity rate unit setting means, so cost-effective harmonic suppression is excellent. There is a great effect that equipment can be introduced.

Further, according to a twelfth aspect of the present invention, the estimated harmonic power for each arbitrary order after a predetermined period of time is calculated from the electric charge set by the unit price setting means by measuring the estimated harmonic power amount for each arbitrary order. By displaying the amount of wave power in monetary value, the effect of introducing harmonic suppression equipment can be estimated not only by the cumulative value and estimated value of harmonic power, but also by the amount of any order. Sometimes it is possible to select a harmonic measuring device for suppressing the harmonic component of a specific order that is most effective, and even if the electricity bill is revised, it can be handled by the electricity bill unit setting means.

The invention according to claim 13 of the present invention provides:
By measuring the electric charge of the accumulated harmonic electric energy from the electric energy set by the harmonic electric energy and the unit price setting means to the present, not only can the accumulated value or the estimated value of the harmonic electric energy be obtained, but also the current value. The amount of accumulated harmonic power up to can be displayed in monetary value, the cost-effectiveness of introducing harmonic suppression equipment can be clarified, and even if the electricity rate is revised, it can be handled by the electricity rate unit setting means .

Further, according to a fourteenth aspect of the present invention, the harmonic power amount is measured for each arbitrary order, and the harmonic power amount of an arbitrary order accumulated from the electricity rate set by the unit price setting means to the present time is calculated. By measuring the electricity price of the system, not only can the accumulated or estimated value of the harmonic power be obtained, but also the electricity price of the accumulated harmonic power up to the present can be displayed for each order, and the optimal harmonic for the device can be displayed. There is a great effect that the introduction of the wave suppression device can be determined.

[Brief description of the drawings]

FIG. 1 is a block diagram of a harmonic measurement device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a harmonic measurement device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a harmonic measurement device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a harmonic measurement device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1, 9, 19, 29 Measurement object 2, 10, 20, 30 PT 3, 11, 21, 31 CT 4, 14, 24, 36 Harmonic power amount measuring means 5, 15, 25, 37 Estimated harmonic power Quantity metering means 6, 16, 26, 38 Electricity rate unit setting means 7, 17, 27, 39 Electricity rate computing means 8, 18, 28, 40 Estimated electricity rate computing means 12, 13, 32, 33 Filtering means 22, 34 Fundamental electric energy measuring means 23, 35 Total electric energy measuring means

Claims (14)

[Claims] 1. A harmonic power meter for measuring only an electric power of a harmonic component of a commercial frequency from an input voltage and an input current of an object to be measured, and after a predetermined period of time from data of the harmonic power meter. A harmonic measuring device provided with an estimated harmonic power amount measuring means for estimating the power amount of only the harmonic component of the commercial frequency. 2. The harmonic measurement according to claim 1, wherein the harmonic power amount measuring means is a means for measuring the power amount of only the harmonic component of the commercial frequency from the input voltage and input current of the measuring object by fast Fourier transform. apparatus. 3. The harmonic measuring apparatus according to claim 2, wherein the harmonic power amount measuring means and the estimated harmonic power amount measuring means are capable of measuring by any order. 4. A filter means for cutting off a fundamental frequency of a commercial frequency from an input voltage and an input current of an object to be measured, and only a harmonic component of a commercial frequency from the input voltage and the input current whose fundamental wave is cut off by the filter means. Harmonic power amount measuring means for measuring the power amount of the power supply, and estimated harmonic power amount measuring means for estimating only the electric power amount of the harmonic component of the commercial frequency after a predetermined period from the data of the harmonic power amount measuring means. Harmonic measurement equipment. 5. A fundamental wave power measuring means for measuring a power amount of a fundamental frequency of a commercial frequency from an input voltage and an input current of an object to be measured, and a fundamental wave and a harmonic component of a commercial frequency from the input voltage and the input current. A total electric energy measuring means for measuring the electric energy including all the electric power, and subtracting the data of the fundamental power electric power measuring means from the data of the total electric energy measuring means to obtain the electric energy of only the harmonic component of the commercial frequency. Harmonic measurement provided with a harmonic power amount measuring unit to be measured, and an estimated harmonic power amount measuring unit for estimating only the power amount of a harmonic component of a commercial frequency after a predetermined period from data of the harmonic power amount measuring unit. apparatus. 6. The harmonic measuring apparatus according to claim 5, wherein the fundamental wave electric energy measuring means is a means for measuring the electric energy of the fundamental wave of the commercial frequency from the input voltage and the input current of the object to be measured by fast Fourier transform. 7. The fundamental power metering means is a fundamental power measuring means for measuring the power of the fundamental frequency of the commercial frequency from the input voltage and input current of the object to be measured, and the total power metering means is connected to the input voltage and the input voltage. A total power measuring means for measuring power including all of the fundamental and harmonic components of the commercial frequency from the current, and the harmonic power amount measuring means subtracts the data of the fundamental power measuring means from the data of the total power measuring means. 6. The harmonic measuring apparatus according to claim 5, wherein the measured data is integrated to measure a power amount of only a harmonic component of a commercial frequency. 8. The harmonic wave according to claim 7, wherein said fundamental wave power amount measuring means is a fundamental wave power measuring means for measuring power of a fundamental wave of a commercial frequency by fast Fourier transform from an input voltage and an input current of an object to be measured. Measuring device. 9. A filter means for cutting off a harmonic component of a commercial frequency from an input voltage and an input current of an object to be measured; A fundamental electric energy measuring means for measuring the electric energy of the wave, and a total electric energy measuring means for measuring the electric energy including all of the fundamental and harmonic components of the commercial frequency from the input voltage and the input current at the preceding stage of the filter means. Means for measuring the power amount of only the harmonic component of the commercial frequency by subtracting the data of the fundamental power amount measurement unit from the data of the total power amount measurement unit; and A harmonic measuring device provided with an estimated harmonic power amount measuring means for estimating only the electric power amount of the harmonic component of the commercial frequency after a predetermined period from the data of the power amount measuring means. 10. A fundamental wave power measuring means for measuring the power of a fundamental wave of a commercial frequency from the input voltage and the input current whose harmonic components have been cut off by the filter means, The measuring means is a total power measuring means for measuring power including all of a fundamental frequency and a harmonic component of a commercial frequency from the input voltage and the input current at the preceding stage of the filter means, and the harmonic power amount measuring means is a total power measuring means. 10. The harmonic measuring apparatus according to claim 9, wherein the data obtained by subtracting the data of the fundamental power measuring means from the data of the means are integrated to measure only the electric power of the harmonic component of the commercial frequency. 11. An electricity rate unit price setting means for setting a unit price of an electricity rate, and an electricity rate set by the electricity rate unit price setting means and an estimated harmonic power amount measured by the estimated harmonic power amount measuring means. The harmonic measuring device according to any one of claims 1 to 4, further comprising estimated electricity rate calculating means for estimating an electricity rate of an electric energy of only a harmonic component of a commercial frequency after a predetermined period. 12. An electric charge unit price setting means for setting a unit price of an electric charge, and an estimated harmonic measured by an arbitrary order by an electric charge set by the electric charge unit price setting means and an estimated harmonic power amount measuring means. 4. The harmonic measurement device according to claim 3, further comprising: an estimated electricity rate calculating means for estimating an electricity rate of an electric energy of an arbitrary order harmonic component of a commercial frequency after a predetermined period from the electric energy. 13. An electric charge unit price setting means for setting a unit price of an electric charge, and a current harmonic from the electric charge set by the electric charge unit price setting means and the electric energy measured by the harmonic electric energy measuring means. The harmonic measuring device according to claim 1, further comprising an electricity rate calculation unit configured to calculate an electricity rate of the accumulated electric energy of the wave. 14. A unit price setting unit for setting a unit price of a unit price of electricity, and an electric charge set by the unit price setting unit of electricity and a power amount measured for each order by the harmonic power amount measuring unit. 13. The harmonic measuring device according to claim 3, further comprising an electricity rate calculating means for calculating an electricity rate of an accumulated power amount of harmonics of any order up to the present.