JP2012055061A - Method, apparatus and program for discriminating operating state of distributed power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate an operating state of a distributed power supply without need for direct installation of a measurement apparatus for a distributed power supply installed at a user's building.SOLUTION: The present invention is configured to perform the following operations: receiving inputs of data on measured values of power reception point active power and power reception point reactive power (S1); substituting the measured value of active power into a discriminant function and calculating a calculated value of reactive power (S2); and comparing the magnitude of the calculated value of the reactive power and the measured value of the reactive power with each other to discriminate the operating states of a distributed power supply (S3).

Description

  The present invention relates to an operation state detection method, an operation state detection device, and an operation state detection program for a distributed power source. More specifically, the present invention relates to a technique for discriminating the operation state of a distributed power source connected to a circuit in a customer linked to a power distribution system.

  In the present specification, a distributed power source means a power source for a private power generation facility or the like of a (high voltage) consumer linked to a power distribution system (or power transmission system). In addition, a state where the distributed power source is operating and generating power is referred to as operating, and a state where the distributed power source is stopped and not generating power is referred to as no operation.

  When distributed power sources are connected to the power distribution system, there are concerns about deviations in supply voltage and overload after distribution line accident recovery (especially immediately after). To prevent these problems and to operate the power distribution system properly It is necessary to roughly calculate the load and power flow (current) in each section of the distribution system divided by the division switch, and for this purpose, the distribution system operator always knows the operating status of each distributed power source. It is necessary to do.

  As a conventional technique for calculating a load in each section of a distribution system divided by a division switch when a distributed power source is connected to the distribution system, for example, there is a section load calculation device for a distribution line (patent) Reference 1). This device is the measured value measured by the distributed power output measuring means installed in each distributed power source connected to the distribution system and the transmitted power of the distribution line measured at the substation. Calculate the actual load of each section based on the measured value of the current supplied to the distribution system from the distributed power supply at the same time as the measurement time of the transmitted power, thereby grasping the power flow in each section It is.

JP 2003-61247 A

  However, in the section load calculation device for distribution lines in Patent Document 1, it is necessary to perform measurement by directly installing a measuring device for each distributed power source in the consumer. Therefore, it is necessary to ask all customers for the installation of the measuring device and obtain approval, which is very difficult in reality.

  Therefore, the present invention provides an operation state detection method and an operation state detection of a distributed power source that can determine the operation state of the distributed power source without directly installing a measuring device with respect to the distributed power source installed in the consumer. An object is to provide a device and an operating state detection program.

  In various studies for detecting the operating state of the distributed power source, the present inventors have made effective power at the power receiving point due to the influence (installation) of the power factor improving capacitor on the circuit in the consumer. It was found that it is possible to determine the operating state of the distributed power source by paying attention to the behavior of reactive power.

  Specifically, first, as shown in FIG. 1, for a customer who has a distributed power source 1 and is connected to a power distribution system 5 via a power receiving point 3, as shown in FIG. Assume a consumer having a capacitor 4. In addition, in FIG. 1, the code | symbol 2 represents the load in a consumer. The power factor improving capacitor is for compensating the delay power factor of the load 2 in the consumer.

The power flowing through the circuit in the consumer shown in FIG. 1 is set as follows.
P: Active power at the receiving point [kW]
(Hereinafter referred to as receiving point active power)
Q: Reactive power at the receiving point [kVar]
(Hereinafter referred to as receiving point reactive power)
P _G : Active power [kW] at the connection point of the distributed power source 1 installed in the consumer
(Hereafter referred to as distributed power source active power)
Q _G : Reactive power [kVar] at the connection point of the distributed power source 1 installed in the consumer
(Hereinafter referred to as distributed power reactive power)
C: Capacity of the power factor improving capacitor installed in the customer [kVA]

  In addition, in this invention, a power receiving point means the distribution system side of the connection point of the distribution system 5 and a consumer. The power receiving point active power is the active power supplied to the customer side from the power supply line on the distribution system side, and the power receiving point reactive power is the reactive power supplied to the customer side from the power supply line on the distribution system side. It is electric power, and is measured at each power receiving point.

  In the present invention, it is assumed that the power factor of each distributed power source is constant for each distributed power source and does not change with time.

As shown in FIG. 2, in the consumer having the power factor improving capacitor 4, the distribution of the plot of the combination data of the receiving point active power P and the receiving point reactive power Q for each time point is In contrast to the distribution region 6 when the effect of the capacitor 4 is not considered and the distributed power source 1 is not operating, the power receiving point reactive power Q is reduced by the input capacity C of the power factor improving capacitor 4, so the distribution region 6c. When the distributed power source 1 is operating, the receiving point active power P decreases by the distributed power source active power P _{G and} the receiving point by the distributed power source reactive power Q _G. Since the reactive power Q decreases, it shifts to the distribution region 6cg.

  Then, as shown in FIG. 2, the inventors set the boundary line between the distribution regions 6 and 6c without operation of the distributed power source 1 and the distribution region 6cg with operation as the power factor of the load 2 in the consumer. It can be expressed by a straight line 7 (hereinafter, referred to as a discriminant function; Formula 1) having a constant c based on the input coefficient C [kVA] of the power factor improving capacitor in the consumer as an inclination, with the coefficient a based on the slope did.

(Equation 1) Q = a × P−c
Where P: active power of receiving point [kW],
Q: Receiving point reactive power [kVar],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the input capacity of the power factor improving capacitor in the customer
Respectively.

  In order to confirm the above-mentioned knowledge, the measured value of the active power at each time point at the power receiving point 3 for the consumer in which the generator as the distributed power source 1 and the power factor improving capacitor are connected to the circuit in the consumer. Combined with the measured value of reactive power and the operation of the distributed power source 1 based on the active power at the generator connection point at the time of measuring the power (measured separately from the measurement at the power receiving point 3 described above) When the plot was made by distinguishing between “no” and “no”, it was as shown in FIG.

The discriminant function is indicated by a straight line 7 in the figure. Specifically, the determination of the discriminant function (straight line 7) is, first, the combination in the time zone when the distributed power source 1 in the consumer is not operating among the combination data of the receiving point active power and the receiving point reactive power for each time point. Equation 2 was obtained by obtaining an approximate straight line 8 of the combination data using only the data (FIG. 4).
(Equation 2) (Receiving point reactive power) = 1.0143 x (Receiving point active power)-1370

  The slope of Equation 2 is the slope of an approximate line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source 1 is not operating, and the value of the slope ( = 1.0143) was a value corresponding to 0.7 when converted to a power factor derived from active power and reactive power. Then, in order to take into account the reduction of the receiving point active power and the receiving point reactive power (that is, the shift of the distribution range in the plot of the combination data) when the distributed power source 1 is operating (see FIG. 2), the power factor 0.7 Then, 0.05 was subtracted (ie, power factor subtraction amount = 0.05), and the slope corresponding to the power factor 0.65 was determined as the slope of the straight line 7 (coefficient a in Formula 1) (FIG. 5). Further, the intercept of Equation 2 is the input capacity (approximate value) of the power factor improving capacitor 4 to the circuit in the customer, and the intercept value (= -1370) is directly used as the intercept of the straight line 7 (constant of Equation 1). c).

  Here, the power factor subtraction amount is not limited to 0.05. For example, the power factor subtraction amount is 0.05 based on the analysis of the distribution tendency (that is, the actual behavior) of the combined data of the receiving point active power and the receiving point reactive power. It was considered to set any value in the range of about ~ 0.15. In addition, the slope of the approximate line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source is not operating is determined by the power factor of the load 2 in the consumer. Therefore, it was considered that the decision may be made based on information on the load in the consumer. That is, the slope of the discriminant function (coefficient a in Equation 1) is an approximate straight line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source is not operating. It may be determined and determined from the slope of the approximate straight line, may be determined from information on the load in the consumer, and further, the measured value of the receiving point active power and the measured value of the receiving point reactive power As a straight line passing through the upper edge of the distribution range in the plot of the combination data with, for example, manually set as appropriate (in this case, the intercept is fixed to one determined by any of the methods described below) Anyway, it was considered good.

  In addition, the intercept of the approximate line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source is not operating is the input of the power factor improving capacitor in the consumer Since it is determined by the capacity, it was considered that it may be determined based on information on the power factor improving capacitor in the consumer. In other words, the intercept of the discriminant function (constant c in Equation 1) is an approximate line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source is not operating. It may be determined from the intercept of the approximate line and determined from the capacity of the power factor improving capacitor actually installed in the consumer. When a plurality of power factor improving capacitors are installed in the consumer, the total value of their capacities is used.

  Also from the results shown in FIG. 3, it is confirmed that the operating state of the distributed power source can be determined by the discriminant function expressed as Equation 1.

  The present invention is based on the above-described knowledge, and the distributed power source operating state detection method according to claim 1 is a method for detecting a connection point between a power distribution system and a customer having a distributed power source and a power factor improving capacitor. The active power and reactive power on the distribution system side are measured, the measured value Pm of the active power is substituted into Equation 3 to calculate the calculated value Qc of the reactive power, the calculated value Qc of the reactive power and the measured value of the reactive power If the measured value of reactive power is equal to or greater than the calculated value Qc of reactive power, it is determined that the distributed power source is operating, and the measured value of reactive power is smaller than the calculated value Qc of reactive power It is judged that there is no operation of the distributed power source.

(Equation 3) Qc = a * Pm-c
Where, Qc: calculated value of reactive power [kVar],
Pm: Measured value of active power [kW],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the capacity of the power factor improving capacitor in the consumer
Respectively.

  According to another aspect of the present invention, there is provided an apparatus for detecting an operating state of a distributed power source, wherein the measured value and invalidity of the active power on the distribution system side of the connection point between the distribution system and a customer having a distributed power source and a power factor improving capacitor Means for reading measured power data, means for substituting the measured active power value Pm into Equation 3 to calculate the calculated reactive power value Qc, the calculated reactive power value Qc and the measured reactive power value If the measured value of reactive power is equal to or greater than the calculated value Qc of reactive power, it is determined that the distributed power source is operating, and the measured value of reactive power is smaller than the calculated value Qc of reactive power Includes means for determining that the distributed power source is not operated.

  According to another aspect of the present invention, there is provided a distributed power supply operating state detection program for measuring the active power on the power distribution system side of a connection point between a power distribution system and a customer having a distributed power supply and a power factor improving capacitor, and an invalid value. Means for reading measured power data, means for substituting the measured active power value Pm into Equation 3 to calculate the calculated reactive power value Qc, and the magnitude of the calculated reactive power value Qc and the measured reactive power value When the measured value of reactive power is equal to or greater than the calculated value Qc of reactive power, it is determined that the distributed power source is operating, and when the measured value of reactive power is smaller than the calculated value of reactive power Qc The computer is made to function as a means for judging that the distributed power source is not operated.

  And in these distributed power supply operation state detection method, operation state detection device and operation state detection program, installed in the consumer based on the combination of the measured value of the receiving point active power and the measured value of the receiving point reactive power Since the operation state of the distributed power source is determined, the operation state of the distributed power source installed in the consumer can be detected without directly attaching the measuring device to the distributed power source.

  In addition, since the distributed power supply operation state detection method, the operation state detection apparatus, and the operation state detection program do not use mathematical processing such as complicated numerical analysis, the operation state of the distributed power supply is easily determined. be able to.

  The invention according to claim 2 is the operation state detection method for the distributed power source according to claim 1, wherein the coefficient a based on the power factor of the load in the consumer is set to an effective power when the distributed power source is not operating. Is set to a slope value corresponding to the power factor obtained by subtracting the power factor subtraction amount from the power factor corresponding to the slope of the approximate line representing the relationship between the measured value Pm and the measured value of reactive power. Further, according to the fifth aspect of the present invention, in the operating state detection device for the distributed power source according to the fourth aspect, the coefficient a based on the power factor of the load in the consumer is an effective power when the distributed power source is not operating. Is set to a slope value corresponding to the power factor obtained by subtracting the power factor subtraction amount from the power factor corresponding to the slope of the approximate line representing the relationship between the measured value Pm and the measured value of reactive power. . The invention according to claim 8 is the distributed power supply operating state detection program according to claim 7, wherein the coefficient a based on the power factor of the load in the consumer is an effective power when the distributed power supply is not operating. Is set to a slope value corresponding to the power factor obtained by subtracting the power factor subtraction amount from the power factor corresponding to the slope of the approximate line representing the relationship between the measured value Pm and the measured value of reactive power. . In these cases, the coefficient “a” of Equation 3 that is a discriminant function is appropriately set.

  According to a third aspect of the present invention, in the method for detecting the operating state of the distributed power source according to the second aspect, the power factor subtraction amount is set in the range of 0.05 to 0.15. According to a sixth aspect of the present invention, in the operating state detecting device for a distributed power source according to the fifth aspect, the power factor subtraction amount is set in the range of 0.05 to 0.15. According to a ninth aspect of the present invention, in the operating state detection program for the distributed power source according to the eighth aspect, the power factor subtraction amount is set in the range of 0.05 to 0.15. In these cases, the coefficient “a” of Equation 3 that is a discriminant function is set more appropriately.

  According to the operation state detection method, operation state detection device, and operation state detection program of the distributed power source of the present invention, the operation state of the distributed power source installed in the consumer is detected without directly attaching the measuring device to the distributed power source. Therefore, it is possible to easily construct a mechanism for detecting the operating state of the distributed power source installed in the consumer.

  In addition, according to the operating state detection method, the operating state detection device, and the operating state detection program of the distributed power source of the present invention, it is possible to easily determine the operating state of the distributed power source. It becomes possible to improve versatility as a mechanism for detecting the operating state of the power source.

  In addition, according to the operation state detection method, operation state detection apparatus, and operation state detection program for a distributed power source according to claims 2, 3, 5, 6, 8, and 9, the coefficient a of Equation 3 as a discriminant function Therefore, it is possible to further improve the versatility and the reliability as a mechanism for detecting the operating state of the distributed power source installed in the consumer.

It is a schematic diagram of a circuit in a consumer having a distributed power source and a power factor correction capacitor for explaining the principle of determining the operating state of the distributed power source in the present invention. It is a conceptual diagram showing that the area where the combined data of active power and reactive power can be obtained at the receiving point of the customer varies depending on the presence / absence of the power factor improving capacitor and the operating state of the distributed power source, the distributed power source and the power factor It is a figure explaining the area | region which can take the combination data of the active power according to the driving | running state of a distributed power source and the reactive power in the case of the consumer who has a capacitor for improvement. It is a figure explaining the distribution situation and discriminant function of the actual combination data of the active power according to the operating state of the distributed power source and the reactive power in the case of a consumer having a power factor improving capacitor. It is a figure explaining the distribution situation and approximate straight line of the actual combination data of the active power and the reactive power when the customer having the power factor improving capacitor does not operate the distributed power source. It is a figure explaining the determination of the inclination of the approximate line for taking into consideration the reduction | decrease (shift of a plot distribution range) of receiving point active power and receiving point reactive power when the distributed power supply is driving | operation. It is a flowchart explaining an example of embodiment of the operating condition detection method and operating condition detection program of a distributed power supply of this invention. It is a functional block diagram of the operation state detection apparatus of the distributed power supply when implementing the operation state detection method of the distributed power supply of the embodiment using a program.

  Hereinafter, the configuration of the present invention will be described in detail based on the form shown in the drawings.

  6 and 7 show an embodiment of an operation state detection method, an operation state detection device, and an operation state detection program for a distributed power source according to the present invention. This distributed power source operation state detection method measures active power and reactive power at the distribution system side of the connection point between the distribution system and a customer having a distributed power source and a power factor correction capacitor. The calculated value Qc of the reactive power is calculated by substituting the value Pm into Equation 4, the magnitude of the calculated value Qc of the reactive power and the measured value of the reactive power are compared, and the measured value of the reactive power is calculated as the reactive power. When the value Qc is greater than or equal to Qc, it is determined that the distributed power source is operating, and when the measured reactive power value is smaller than the calculated reactive power value Qc, it is determined that the distributed power source is not operating.

(Equation 4) Qc = a * Pm-c
Where, Qc: calculated value of reactive power [kVar],
Pm: Measured value of active power [kW],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the capacity of the power factor improving capacitor in the customer
Respectively.

  The distributed power supply operating state detection method is realized as the distributed power supply operating state detection apparatus of the present invention. This distributed power supply operating state detection device is a data of active power measurement values and reactive power measurement values on the distribution system side of the connection point between the distribution system and a customer having a distributed power supply and a power factor correction capacitor. , The means for substituting the measured value Pm of the active power into the equation 4 to calculate the calculated value Qc of the reactive power, and the magnitude of the calculated value Qc of the reactive power and the measured value of the reactive power If the measured value of reactive power is equal to or greater than the calculated value of reactive power Qc, it is determined that the distributed power source is operating, and if the measured value of reactive power is smaller than the calculated value of reactive power Qc, Means for determining that there is no driving.

  The above-described distributed power supply operation state detection method and distributed power supply operation state detection apparatus are also realized by executing the distributed power supply operation state detection program of the present invention on a computer. In the present embodiment, a case where a distributed power supply operating state detection program is executed on a computer will be described as an example.

  FIG. 7 shows the overall configuration of the computer 10 (that is, the distributed power supply operation state detection apparatus 10) for executing the distributed power supply operation state detection program 17. The distributed power supply operating state detection device 10 includes a control unit 11, a storage unit 12, an input unit 13, a display unit 14, and a memory 15, and is connected to each other by a signal line such as a bus.

  In addition, the receiving device 16 is connected to the operating state detection device 10 of the distributed power source of the present embodiment by a signal line such as a bus. And in this embodiment, the active power measured by the measuring instrument installed in the distribution system side (namely, receiving point) of the connection point of a distribution system and the consumer who has a distributed power supply and the power factor improvement capacitor | condenser The measured value data of reactive power is input to the operating state detection device 10 of the distributed power source via the receiving device 16. The communication method between the measuring device installed at the power receiving point and the receiving device 16 is not limited to a specific method, and may be wired or wireless.

  The control unit 11 performs operations related to the control of the entire operation state detection device 10 of the distributed power source and the detection of the operation state of the distributed power source by the operation state detection program 17 of the distributed power source stored in the storage unit 12. For example, a CPU (Central Processing Unit). The storage unit 12 is a device that can store at least data and programs, and is, for example, a hard disk. The memory 15 serves as a memory space that is a work area when the control unit 11 executes various controls and operations, and is, for example, a RAM (abbreviation of Random Access Memory).

  The input unit 13 is an interface for giving at least an operator's command to the control unit 11, and is, for example, a keyboard.

  The display unit 14 performs drawing / display of characters, graphics, and the like under the control of the control unit 11 and is, for example, a display.

  Then, the control unit 11 of the distributed power supply operating state detection apparatus 10 executes a distributed power supply operation state detection program 17 so that a customer having a distribution system, a distributed power supply, and a power factor improving capacitor The data receiving unit 11a as means for reading the measured value of the active power and the measured value of the reactive power on the distribution system side of the interconnection point, and the measured value of the reactive power by substituting the measured value Pm of the active power into Equation 4 The calculation unit 11b as a means for calculating Qc is compared with the calculated value of the reactive power Qc and the measured value of the reactive power. When the measured value of the reactive power is equal to or larger than the calculated value of the reactive power Qc, the distributed form When it is determined that the power source is operating and the measured value of reactive power is smaller than the calculated value Qc of the reactive power, a determination unit 11c is configured as a means for determining that the distributed power source is not operating.

  In the execution of the distributed power supply operating state detection method according to the present embodiment, first, the data receiving unit 11a of the control unit 11 receives the measured value Pm of the power receiving point effective power measured by the measuring device installed at the power receiving point, and The input of the measured value Qm of the power receiving point reactive power is received (S1).

  From the measuring device installed at the power receiving point, data of the measured value Pm of the receiving point active power and the measured value Qm of the receiving point reactive power measured continuously or simultaneously with respect to the data receiving unit 11a at a predetermined time interval. Is entered. In the case of this embodiment, the data of the measured values Pm and Qm are sent to the data receiving unit 11a via the receiving device 16. In the case of the present embodiment, the processes after S1 are executed with the measurement value data input to the data receiving unit 11a as a trigger.

  In addition, when a plurality of consumers having a distributed power source are connected to the distribution system and the plurality of consumers are the detection targets of the operating state of the distributed power source, the measuring instrument is, for example, for each consumer. The ID number and the like assigned to is associated with the measured value and sent to the data receiving unit 11a.

  Then, the data receiving unit 11 a stores the input measured value Pm of the power receiving point active power and the measured value Qm of the power receiving point reactive power in the memory 15.

  Next, the calculation unit 11b of the control unit 11 calculates a calculated value of reactive power using the measured value of the receiving point active power and the discriminant function (S2).

  Specifically, the calculation unit 11b reads the measured value Pm of the power receiving point active power stored in the memory 15 in the process of S1 from the memory 15, and substitutes the measured value Pm into the discriminant function expressed by Equation 4. Thus, the calculated value Qc of reactive power is calculated.

  Formula 4 is defined in advance in the operating state detection program 17 of the distributed power source including the values of the coefficient a and the constant c. In this case, when a plurality of consumers are set as detection targets of the operating state of the distributed power source, for example, an ID number assigned to each consumer and a formula 4 in which a coefficient a and a constant c are set for each consumer. Are defined in the program.

  The value of the coefficient a in Equation 4 is, for example, an approximate straight line representing the relationship between the measured value Pm of the receiving point active power and the measured value Qm of the receiving point reactive power when the distributed power source is not operating. At the same time, a power factor corresponding to the slope of the approximate straight line is obtained, and a slope value corresponding to the power factor obtained by subtracting 0.05 to 0.15 as the power factor subtraction amount from the power factor is set.

  Alternatively, the value of the coefficient a in Equation 4 may be determined from information related to the load in the consumer, and further, a plot of combined data of the measured value of the receiving point active power and the measured value of the receiving point reactive power It may be set as appropriate as a straight line passing through the upper edge of the distribution range.

  Further, the value of the constant c in Equation 4 is obtained by calculating an approximate straight line representing the relationship between the measured value Pm of the receiving point active power and the measured value Qm of the receiving point reactive power when the distributed power source is not operating. You may make it set to the value of the intercept of the said approximate line, and you may make it set to the capacity | capacitance of the capacitor for power factor improvement actually installed in the consumer.

  Then, the calculation unit 11 b stores the calculated reactive power calculation value Qc in the memory 15.

  Next, the determination unit 11c of the control unit 11 determines the operating state of the distributed power source installed in the consumer using the measured value Qm of the power receiving point reactive power and the calculated value of reactive power (S3).

  Specifically, the determination unit 11c reads the measured value Qm of the power receiving point reactive power stored in the memory 15 in the process of S1 from the memory 15, and calculates the reactive power stored in the memory 15 in the process of S2. Qc is read from the memory 15.

  If the measured value Qm of the receiving point reactive power is equal to or greater than the calculated value Qc of the reactive power, it is determined that the distributed power source is operating, and the measured value Qm of the receiving point reactive power is smaller than the calculated value Qc of the reactive power. In this case, it is determined that the distributed power source is not operated.

  Then, the determination unit 11 c causes the display unit 14 to display the determination result of the operation state of the distributed power source, for example, or stores the result in the storage unit 12.

  In addition, when a plurality of consumers having a distributed power source are connected to the distribution system and the plurality of consumers are the detection targets of the operating state of the distributed power source, the measuring instrument is, for example, for each consumer. Based on the ID number assigned to the ID, etc., the processing of the discrimination step (S3) is performed for each customer, and the discrimination result of the operating state of the distributed power source is displayed on the display unit 14 together with the ID number, or the ID number and The data are stored in the storage unit 12 in association with each other.

  And the control part 11 complete | finishes the process of discrimination | determination of the driving | running state of a distributed power supply with respect to the measured value input in the process of S1 (END).

  The operation state of the distributed power source determined for each consumer as described above is based on, for example, estimating the power flow for each section of the distribution system divided by the division switch and the actual load power value for each consumer. Based on the value, it is used for controlling the distribution system to avoid the disadvantage that the voltage drops or rises beyond the range of the specified value.

  According to the operation state detection method, operation state detection apparatus, and operation state detection program of the distributed power supply of the present invention configured as described above, the dispersion installed in the consumer without directly attaching the measurement device to the distributed power supply The operating state of the power source can be detected. For this reason, it becomes possible to easily construct a mechanism for detecting the operating state of a distributed power source installed in a consumer. In addition, since mathematical processing such as complicated numerical analysis is not used, it is possible to easily determine the operating state of the distributed power source, and as a mechanism for detecting the operating state of the distributed power source installed in the consumer It is possible to improve the versatility.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the measuring device installed at the power receiving point measures the power receiving point active power and the power receiving point reactive power, and the measured values Pm and Qm are separately provided to the operating state detection device 10 of the distributed power source. Although it is configured to transmit, in some cases, the measuring instrument may determine the operating state of the distributed power source installed in the consumer. In this case, particularly when a large number of customers with distributed power sources are connected to the power distribution system, the load on the processing for determining the operating state of the distributed power source is distributed and processed more quickly. There is an effect that can be.

  An embodiment in which an operation state detection method, an operation state detection apparatus, and an operation state detection program according to the present invention are applied to discrimination of an operation state of a distributed power source in an actual consumer will be described.

  In this embodiment, the generator as the distributed power source 1 and the power factor improving capacitor are targeted to three consumers connected to the circuit in the customer. First, the active power at each time point at the power receiving point 3 is measured. The combination data of the measured value of the power and the reactive power is determined based on the active power at the generator connection point at the time of measuring the power (measured separately from the measurement at the power receiving point 3 described above). Collected separately from no driving.

  Then, for each of the three consumers, an approximate line representing the relationship between the measured value of the receiving point active power and the measured value of the receiving point reactive power when the distributed power source 1 is not operating is obtained, and the approximate line Was set as the value of the constant c of the discriminant function (Formula 4).

  In addition, for each of the three consumers, a power factor corresponding to the slope value of the approximate straight line is obtained, and the slope corresponding to the power factor obtained by subtracting 0.05, 0.10, 0.15 as the power factor subtraction amount from the power factor value. Each value was determined. And the value of the inclination calculated | required by the above was set as a value of the coefficient a of discriminant function (Formula 4) for every three consumers. As described above, the discriminant function for each of the three consumers is set for each of the three types of power factor subtraction amounts.

Then, using the above discriminant function, the operating state of the distributed power source is discriminated, and compared with the presence / absence of operation of the distributed power source obtained as a result, the correct answer rate of the operating state is subtracted from the three power factor subtraction amounts. The results shown in Table 1 (Power factor deduction amount = 0.05), Table 2 (Power factor deduction amount = 0.10), and Table 3 (Power factor deduction amount = 0.15) were obtained for each of the three consumers. .

  From the results shown in Table 1, Table 2, and Table 3, according to the operation state detection method, operation state detection device, and operation state detection program of the distributed power source of the present invention, it is possible to easily determine the operation state of the distributed power source. It was confirmed that

  Also, the coefficient a in Equation 4 as a discrimination coefficient is a power factor corresponding to the slope of an approximate line representing the relationship between the measured value of active power and the measured value of reactive power when the distributed power source is not operating. It was confirmed that the coefficient a of Equation 4 as a discriminant function can be set appropriately by setting the value of the slope corresponding to the power factor obtained by subtracting the power factor subtraction amount from. Furthermore, it was confirmed that the coefficient a of Equation 4 as the discriminant function can be set appropriately by setting the power factor subtraction amount in the range of 0.05 to 0.15.

DESCRIPTION OF SYMBOLS 10 Operating state detection apparatus of distributed power supply 11 Control part 11a Data receiving part 11b Calculation part 11c Discriminating part 17 Operating state detection program of distributed power supply

Claims (9)

Measure the active power and reactive power at the distribution system side at the connection point between the distribution system and the customer who has the distributed power source and the power factor improving capacitor, and substitute the measured value Pm of the active power into Equation 1 for invalidity. When the calculated value Qc of the reactive power is calculated, the magnitude of the calculated value Qc of the reactive power and the measured value of the reactive power are compared, and the measured value of the reactive power is equal to or greater than the calculated value Qc of the reactive power It is determined that the distributed power source is in operation, and when the measured value of the reactive power is smaller than the calculated value Qc of the reactive power, it is determined that the distributed power source is not in operation. Operating state detection method.
(Equation 1) Qc = a * Pm-c
Where, Qc: calculated value of reactive power [kVar],
Pm: Measured value of active power [kW],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the capacity of the power factor improving capacitor in the consumer
Respectively.   The coefficient a based on the power factor of the load in the consumer is the slope of an approximate line representing the relationship between the measured value Pm of the active power and the measured value of the reactive power when the distributed power source is not operating. 2. The distributed power supply operating state detection method according to claim 1, wherein a slope value corresponding to a power factor obtained by subtracting a power factor subtraction amount from a power factor corresponding to is set.   3. The distributed power source operating state detection method according to claim 2, wherein the power factor subtraction amount is set in a range of 0.05 to 0.15. Means for reading the measured value of the active power and the measured value of the reactive power at the distribution system side at the connection point between the distribution system and the customer having the distributed power source and the power factor improving capacitor, and the measured value of the active power Substituting Pm into Equation 2 to calculate the calculated value of reactive power Qc, and comparing the calculated value of reactive power Qc with the measured value of reactive power, the measured value of reactive power is When the calculated value of reactive power is equal to or greater than Qc, it is determined that the distributed power source is in operation, and when the measured value of reactive power is smaller than the calculated value of reactive power, Qc, the distributed power source is not operated. And an operating state detection device for a distributed power source.
(Equation 2) Qc = a * Pm-c
Where, Qc: calculated value of reactive power [kVar],
Pm: Measured value of active power [kW],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the capacity of the power factor improving capacitor in the customer
Respectively.   The coefficient a based on the power factor of the load in the consumer is an inclination of an approximate line representing the relationship between the measured value Pm of the active power and the measured value of the reactive power when the distributed power source is not operating. 5. The operating state detection device for a distributed power source according to claim 4, wherein the power factor is set to a value corresponding to a power factor obtained by subtracting a power factor subtraction amount from a power factor corresponding to.   6. The distributed power source operating state detecting device according to claim 5, wherein the power factor subtraction amount is set in a range of 0.05 to 0.15. Means for reading the measured value of the active power and the measured value of the reactive power on the distribution system side at the connection point between the distribution system and the customer having the distributed power source and the power factor improving capacitor, the measured value Pm of the active power Substituting Equation 3 for calculating the reactive power calculation value Qc, comparing the calculated reactive power value Qc with the measured reactive power value, and determining the reactive power measurement value to be the reactive power. If the calculated value Qc is equal to or greater than the calculated value Qc, it is determined that the distributed power source is operating, and if the measured value of the reactive power is smaller than the calculated reactive power value Qc, it is determined that the distributed power source is not operated. An operating state detection program for a distributed power source for causing a computer to function as means.
(Equation 3) Qc = a * Pm-c
Where, Qc: calculated value of reactive power [kVar],
Pm: Measured value of active power [kW],
a: coefficient based on the power factor of the load in the consumer,
c: Constant based on the capacity of the power factor improving capacitor in the consumer
Respectively.   The coefficient a based on the power factor of the load in the consumer is an inclination of an approximate line representing the relationship between the measured value Pm of the active power and the measured value of the reactive power when the distributed power source is not operating. 8. The distributed power supply operating state detection program according to claim 7, wherein a slope value corresponding to a power factor obtained by subtracting a power factor subtraction amount from a power factor corresponding to is set.   9. The distributed power supply operating state detection program according to claim 8, wherein the power factor subtraction amount is set in a range of 0.05 to 0.15.