JP2005261152A - Distribution system monitoring and controlling system and watt-hour meter with system monitoring function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution system monitoring and controlling system and a watt-hour meter with a system monitoring function capable of monitoring and controlling the quality of electric power of a distribution system in which scattered power supplies are used by utilizing an existing system. <P>SOLUTION: This distribution system monitoring and controlling system is provided with a distribution line, the scattered power supplies, a first system-controlling watt-hour meter that measures the quality of the electric power of the scattered power supplies; a second system-controlling watt-hour meter that measures loads of consumers that receive the supply of electric power from the scattered power supplies and the quality of the electric power of the loads of the consumers; and a network with the distribution system controlling devices on the distribution line. The first and second system-controlling watt-hour meters transmit the measured power quality data to the distribution system controlling device. If an abnormal value occurs in the power quality data, the cause of the abnormal value is specified and a warning is notified to the system-controlling watt-hour meter prepared for the scattered power supplies or the loads of the consumers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a distribution system monitoring and control system and a watt-hour meter with a system monitoring function, and more particularly to a distribution system monitoring and control system and a watt-hour meter with a system monitoring function for monitoring and controlling power quality when a distributed power source is installed.

  Conventional control of the power transmission and distribution system has been configured as a supervisory control system that is independently performed by an electric power company. A conventional example of this distribution system monitoring control system will be described with reference to FIG.

  In the figure, power transmitted from a power transmission substation (not shown) of the upper power transmission system passes through the transformer 20 of the power distribution substation 10 and passes through the transformers 11 and 14 in the regions separated by the distribution line 1. The power is transferred to the power transfer devices 12 and 15.

  The power transfer devices 12 and 15 are equipped with system control sensors 13 and 16, respectively, and measure power quality data of power transferred via the transformers 11 and 14, respectively, and the distribution substation 10 via the network 8. To the distribution system monitoring and control device 10c.

  The distribution system monitoring and control device 10c receives power quality data from the system control sensors 13 and 16, and further receives power quality data from the distribution system sensor 10b that controls the distribution power of the distribution substation 10 itself. The power distribution apparatus 10a is configured to control the distribution power transfer device 10a so as to ensure that the power is distributed from the transformer 20 so that the power quality can ensure a predetermined quality.

  Further, the distribution system monitoring and control device 10c instructs the system control sensors 13 and 16 or the direct power transfer devices 12 and 15 to control the power quality of the distribution line 1 by the power transfer devices 12 and 15 (for example, patents). Reference 1).

  In the future, with the revision of the Electricity Business Law, such power distribution monitoring and control systems will become more active in the wholesale market for power generation. In each region, distributed power supplies such as wind power generation, solar power generation, and batteries will be installed. It is expected to be introduced in large quantities.

  Here, the power quality data detected by the system control sensors 13 and 16 and the distribution system control sensor 10b includes the voltage, current, and active / reactive power at the transmission / reception power input end of each device distributed on the distribution line 1. Quantity, frequency, and harmonic current data are included.

Since this distributed power supply device has a high degree of freedom of operation, it is expected that the voltage quality will be lowered and the generation of harmonic current even during steady state, and the power quality of the entire distribution line will be reduced. There is known a control device that optimizes system control while maintaining a balance between power generation energy and energy consumption between distribution systems (see, for example, Patent Document 2).
JP-A-9-154235 Japanese Patent Laid-Open No. 11-146560 (first page, FIG. 1)

  However, as described above, since the power quality of the conventional distribution system is different from the power generation company and its customer load using the same distribution line, any device can be used when the power quality is reduced. Since the cause of the equipment cannot be specified, not only is the countermeasure difficult, but there is a problem that the entire distribution system is operated in an abnormal state.

  In addition, there is a problem that it takes a lot of cost to construct a system in which a newly entering power generation company secures power quality based on a sales contract with a consumer.

  The present invention has been made to solve the above problems, and in a power distribution system in which power generation companies' distributed power supply devices are mixed, the existing system is utilized to monitor the power quality of the power distribution system. An object of the present invention is to provide a distribution system monitoring control system and a watt-hour meter with a system monitoring function capable of specifying the device and monitoring and controlling the power quality of the distribution system when there is a decrease.

  In order to achieve the above object, a distribution system monitoring and control system according to claim 1 of the present invention is a distribution system monitoring and control system of a distributed power supply apparatus, and a distribution line of a distribution system and a new distribution line are added to the distribution line. A distributed power supply apparatus, a first watt-hour meter with a system control and monitoring function for measuring power quality exchanged by the distributed power supply apparatus, and a customer of the distributed power supply apparatus connected to the distribution line And a communication terminal provided in the first and second watt-hour meters with system control and monitoring function, which measure the power quality of the load power of the consumer, A network connecting the distribution system control device of the distribution line, and a distribution substation equipped with a distribution power transfer device controlled by the distribution system control device, the first and second system control monitoring Energy meter with function The measured power quality data is transmitted to the distribution system control device, and the distribution system control device, when an abnormal value is generated in the power quality data, is caused by the distributed power supply device or the consumer load If it is determined that the power meter is present, the first or the second system-controlled monitoring function-equipped watt-hour meter is notified via the network.

  To achieve the above object, a watt-hour meter with a distribution system monitoring function according to claim 4 of the present invention is a power amount measuring circuit for measuring a power amount contracted for power sale, and a power quality measuring circuit for the power. The power quality determination circuit of the power, and the output signals of the power amount measurement circuit and the power quality measurement circuit are transmitted, and when the power quality determination circuit detects a quality abnormality, the output signal of the power quality measurement circuit is It has a communication control circuit with a priority selection circuit that sends it with priority, and simultaneously measures the power amount measurement and power quality measurement, and gives priority to sending the power quality output signal when the power quality is abnormal It is characterized by.

  According to the present invention, each of the distributed power supply apparatus newly installed in the distribution line of the distribution system and the consumer load thereof is provided with a watt-hour meter with a system control function, and using a conventional power amount measurement network. The power quality abnormal value is transmitted from these watt-hour meters with the system control function to the distribution system control device of the distribution substation, and the power quality of the distributed power supply newly installed in the distribution line and its load is constantly monitored. However, because the device that causes the abnormality is identified from the abnormal value of the power quality and notified, the power quality is degraded in the distribution system where a large number of power generation companies' distributed power supply devices are mixed. In this case, it is possible to provide a distribution system monitoring and control system that can quickly identify the generation device.

  In addition, using the existing network, the power amount and power quality are measured at the same time, and when there is an abnormality in the power quality, it is sent to the power distribution system controller that preferentially manages the power distribution system. Can provide a watt-hour meter with a distribution system monitoring function that can constantly monitor the distribution system.

  Embodiments according to the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing the configuration of a distribution system monitoring and control system according to the present invention. A distributed power supply 3 newly installed in a distribution line 1 of an existing distribution system and its customer load (load of the distributed power supply 3). ) 6 indicates that it is equipped.

  First, the configuration of the existing system will be described. The existing system distributes electric power transmitted from an upper transmission system substation (not shown) to a distribution substation 10 which is one of a plurality of distribution substations, and a plurality of power distribution to the distribution substation 10 via a transformer 20. 1 shows a state where a power transmission / reception device 12, which is one of the power transmission / reception devices, is installed via a transformer 11.

  The distribution substation 10 includes a distribution power transmission / reception device 10a, a distribution system sensor 10b that detects power quality at a transmission / reception end of the distribution power transmission / reception device 10a, and a distribution system monitoring and control device that controls the power quality of the distribution substation 10 10c.

  The power quality of the distribution line 1 is detected by the system sensor 13 at the transmission / reception end of the power transmission / reception device 12 and transmitted to the distribution system monitoring / control device 10 c via the network 8.

  That is, in the existing power distribution system, based on the power quality data transmitted from the power distribution system sensor 10b and the power system sensor 13, the power distribution system monitoring and control device 10c supervises and monitors the power quality of the distribution line 1 and when an abnormality occurs, The power quality is controlled by instructing the distribution power transfer device 10a and the power transfer device 12.

  Here, the power quality data refers to measured values such as voltage, current, reactive / active power, frequency, and harmonic current measured at each point of the distribution line 1.

  Next, the equipment that the power distributor and its customers equip on the distribution line 1 will be described. The distribution line 1 is equipped with a distributed power supply device 3 via a transformer 2. A power meter 4 with a system monitoring function is provided at the sending / receiving end, and its output is connected to the network 8.

  Similarly, the customer load 6 contracted to buy and sell with the distributed power supply 3 receives power via the transformer 5, and the power quality at the power receiving end is measured by the watt-hour meter 7 with a system monitoring function. Are connected to the network 8.

  Next, the watt-hour meter 4 (7) with a system monitoring function used in the distribution system monitoring control system configured as described above will be described with reference to FIG.

  A watt-hour meter 4 with a system monitoring function is a power amount measuring circuit 4a that measures the amount of power based on a sales contract with a consumer at the power transfer end of the distribution line 1, and similarly, the power at the power transfer end Power quality measurement circuit 4b for measuring quality, power quality determination circuit 4c for determining the quality of the measured power quality data, and power amount, power quality data, and power quality determination measured and determined by each circuit The communication control circuit 4d is configured to receive the output and transmit it via the network 8.

  The power quality determination circuit 4c compares the set values of the power quality setting circuit 4c1 and the power quality setting circuit 4c1 with the output of the power quality measurement circuit 4b, and determines whether the power quality measurement circuit 4b is within a predetermined pass / fail criterion. The circuit 4c2.

  Further, the communication control circuit 4d has a function of periodically transmitting the preset instrument number of the watt-hour meter 4 with system monitoring function, the input power measurement circuit 4a and the output data of the power quality measurement circuit 4b, A priority selection circuit 4d1 having a function of preferentially transmitting when an output of the comparison determination circuit 4c2 is generated is provided.

  Next, the operation of the distribution system monitoring and control system configured as described above will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the control operation of the distribution system monitoring control device 10c.

  The distribution system monitoring control device 10c determines whether or not there is an abnormal power quality value (priority transmission) from the watt-hour meter 4 or 7 with the system control function (step s1).

  Next, it is determined whether or not the abnormal value is generated in either the watt-hour meter 4 or 7 with the system control function (step s2).

  If abnormal data is generated on both sides, the corresponding items of the power quality data are compared to determine whether or not a predetermined use condition of the distribution line 1 is satisfied (step s3). If the difference is within the allowable range, the power quality data of its own power distribution system sensor 10b is referred to and a control command is given to the power distribution apparatus 10a (step s4).

  Otherwise, the system monitoring function-equipped watt-hour meter 4 or 7 that has transmitted the abnormality value is warned of the facility abnormality and a control command is transmitted (step s5).

  Then, as a result of this control command, monitoring is repeated until the abnormal value is improved, and when it is improved, it is transmitted to each command destination that has given a control command that the normal value range has been reached (step s6).

  In step s2, when the abnormal value is preferentially transmitted from only one of the watt-hour meters 4 or 7 with the system monitoring function, the cause of the abnormality is at the measurement point with reference to the power quality data of the distribution system sensor 10b. The abnormal value correction control is instructed to the watt-hour meter 4 or 7 with a system monitoring function.

  According to the power distribution system monitoring system as described above, the power distribution system monitoring and control device 10c does not need to constantly monitor the power distribution control system 10c, and thus does not burden the control operation of the power distribution system monitoring and control apparatus 10c.

  In addition, since the entire distribution system can be monitored, it can be determined from the power supply and demand state of the entire distribution line 1 whether or not the load usage state of the power generator and the customer is within the contracted sales contract range. Therefore, it is possible to appropriately command the abnormality of the power distribution path 1 and the countermeasures.

  In addition, the watt-hour meter with grid control function can mutually check the energy consumption of newly entered sales contractors by utilizing the existing network. Expected to be able to provide mutual support with power producers.

  In addition, this invention is not limited to said Example, It is possible to modify | change within the range which does not deviate from the main point. For example, the watt-hour meter with a system monitoring function can receive a control command from the distribution system monitoring control device 10c and control the distributed power supply device.

  Specifically, if the distribution system monitoring and control device 10c is a server and the terminal function, for example, the browser function is provided in each watt-hour meter with the system monitoring function, this function is equipped with various distributed power supply devices. Even in this case, it is possible to configure a distribution system monitoring and control system that can easily control the power quality of the distribution line.

The block diagram which shows the structure of the power distribution system monitoring control system of this invention. The block diagram which shows the structure of the watt-hour meter with a distribution system monitoring function of this invention. The flowchart figure which shows the example of control operation of the power distribution system monitoring control apparatus of this invention. The block diagram which shows the structure of the conventional power distribution system monitoring control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Distribution line 2, 5 Transformer 3, 6 Distributed type power supply device 4, 7 Power meter 4a with a system monitoring function Electric energy measuring circuit 4b Electric power quality measuring circuit 4c Electric power quality judgment circuit 4c1 Electric power quality setting circuit 4c2 Comparison judgment circuit 4d Communication control circuit 4d1 Priority selection circuit 8 Network 10 Distribution substation 10a Distribution power transfer device 10b Distribution system sensor 10c Distribution system monitoring control device 11, 14, 20 Transformer 12, 15 Power transfer device 13, 16 System control sensor

Claims (5)

A distribution system monitoring and control system for a distributed power supply,
A distribution line of the distribution system;
A distributed power supply device newly installed in the distribution line;
A watt-hour meter with a first system control monitoring function for measuring power quality exchanged with the distributed power supply device;
Connected to the distribution line, the load of the customer of the distributed power supply,
A second watt-hour meter with a system control monitoring function for measuring the power quality of the load power of the consumer;
A network connecting the communication terminal of the first and second watt-hour meters with system control monitoring function and the distribution system control device of the distribution line,
A distribution substation equipped with a distribution power transfer device controlled by the distribution system control device;
The first and second watt-hour meters with system control monitoring function transmit the measured power quality data to the distribution system control device,
When the distribution system control device determines that the cause is the distributed power supply device or the customer load when an abnormal value is generated in the power quality data, the network via the network, A power distribution system monitoring and control system characterized in that the first or the second power meter with system control and monitoring function is notified.   2. The distribution system monitoring and control system according to claim 1, wherein the watt-hour meter with a distribution system monitoring function includes a power amount measurement unit based on a power sale contract and the power quality determination unit.   The watt-hour meter with a distribution system monitoring function is configured to output power quality data when an abnormality is detected in output signals of a power amount measuring means based on a power sale contract, the power quality measuring means, and the power quality determining means. The distribution system monitoring and control system according to claim 1, further comprising a communication unit that preferentially transmits. An electric energy measuring circuit for measuring the electric energy contracted for power sale, and
A power quality measurement circuit for the power;
A power quality determination circuit for the power;
A priority selection circuit for transmitting output signals of the power amount measurement circuit and the power quality measurement circuit and preferentially transmitting the output signal of the power quality measurement circuit when the power quality determination circuit detects a quality abnormality; A communication control circuit with
A watt-hour meter with a system monitoring function, characterized in that the power quality measurement and the power quality measurement are simultaneously measured, and the power quality output signal when the power quality is abnormal is preferentially transmitted.   The watt-hour meter with a system monitoring function, wherein the power quality judgment circuit includes at least means for measuring voltage, current, frequency, active / reactive energy, and harmonic current of the distribution line.

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