JPS63121431A - Maximum demand power regulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention performs maximum power demand monitoring by detecting changes in the maximum power demand monitoring range and using target power values corresponding to the target range. Maximum power demand monitoring suitable for large-scale power receiving and distribution systems that exchange power between power receiving stations 1ll11
Regarding equipment.

[Conventional technology]

Conventional devices, as described in Japanese Patent Publication No. 58-54724, monitor the maximum power demand for a fixed target power and adjust the load when the target power is exceeded.

[Problem that the invention seeks to solve]

The above conventional technology is effective when the maximum power demand monitoring target range is fixed, but it does not take into account maximum power demand monitoring when the monitoring range expands due to the occurrence of events such as power outages and failures of equipment. When expanding the monitoring target range, maximum power demand monitoring according to the target power when the monitoring target range is fixed.
Ka, ka□o.

゛There was a problem in that the excess power would be load-limited.

An object of the present invention is to monitor the occurrence of an event that expands the monitoring target range, and if the event does not occur, monitor the maximum power demand according to the target power when the monitoring target range is fixed. When an event occurs, JR1 includes the expanded equipment to be monitored! ! Expanded monitoring target by monitoring the maximum power demand according to power! ! The purpose of this system is to prevent the conventional phenomenon of recognizing two reserves as an excess and limiting the load, and to monitor the maximum power demand corresponding to the target equipment range.

[Means for solving problems]

The above purpose is to check whether the maximum power demand monitoring range is appropriate at the m power at the time of detection of the excess in the load limiting device that handles the excess power when the maximum power demand monitoring device detects an excess of the target power, and to monitor the If the target range is expanded due to equipment power outage, etc., load restriction is required wIJ9! With i-power and reserve power available with extended range support,
Determines whether load limiting is necessary and determines the load limiting power.

(1) In the case of regulated power and reserve power No load shedding.

(2) Regulated power> In the case of reserve power, load limiting is necessary; load limiting power = excess electric car secondary power When load limiting is necessary, it is achieved by limiting the load of load limiting power.

If the target power at the time of excess detection is reasonable.

Assuming reserve power = 0, load limit power is determined and load limit is performed.

[Effect]

The maximum power demand monitoring device monitors the maximum power demand in a 30-minute cycle according to the target power in the fixed range before the monitoring range is expanded.If the target power is exceeded, the maximum power demand is reduced to within the target power. In order to maintain the load limit, a fixed power, which is the power required for load limiting, is determined, and the load limiting device is used to limit the load.

On the other hand, the power fusion detection device detects whether the monitoring target range is a fixed range or has been expanded by means of a rod assembly, etc. In the event of a power outage, etc., power is transferred to the equipment where the power outage occurred, and the monitoring range is The load limiting device that is requested by the maximum demand power monitoring device to limit the load due to exceeding the target power checks the monitoring expansion information detected and stored by the power accommodation detection device, and when the monitoring is expanded, the load limiting device The preload power corresponding to the power that is not flexible is retrieved from the reserve power storage device, and the load limit power is recalculated based on the adjustment power and reserve power according to the judgment in the previous section, taking into account the priority of the load limiter. Decide which devices are subject to load limiting and apply load limiting to those devices.

By detecting the expansion of monitoring by this power accommodating detection device and by taking into account the load limit power recalculation means that takes into account the reserve power, the power accommodating amount due to the expansion of the monitoring range is also taken into consideration in the form of target power plus reserve power. There is no need to limit the load for power interchange.

〔Example〕

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

~, Figure 1 shows large-scale power reception and distribution when the present invention is applied.
Figure 2 is a block diagram of the maximum demand power monitoring and adjustment device, and Figure 3 is the load limit power decision flow.In Figure 1, 1 to 4 are power company A power receiving station is a power receiving station that has power distribution and power receiving equipment that buys commercial power from a power source and supplies power to the target area. Each power receiving station signs a power contract with the power company according to the amount of power used, and sets a target power and monitors the maximum power demand to ensure that the contracted power is not exceeded. Eye S
If the power exceeds the AW power, the load is limited in consideration of the priority to prevent the contracted power from being exceeded. If there are multiple power receiving stations as in this example, the electric power company will issue a request to each power receiving station. When power supply is stopped due to a power outage, power is interchanged between power receiving stations to protect the power supply to important loads at the power receiving station where the power outage occurs. The power receiving station that supplies electricity is called the central power receiving station,
The power receiving stations that receive power from the central power receiving station are called terminal power receiving stations.Power is not interchanged between terminal power receiving stations.The central power receiving station has its own power generation equipment to protect the power supply to important loads. It has become. 5 indicates power interchange from 1 in the event of a power outage at the terminal power receiving station 2, and 6 and 7 similarly indicate power interchange from terminal power receiving station 3 and 4.
indicates power interchange from 1 in the event of a power outage. When the terminal power receiving stations 2, 3, and 4 are out of power, the central power receiving station 1 must perform power interchange for the important loads supplied by each power receiving station. The target power of the central power receiving station is different in normal times when it is not being supplied to the terminal power receiving stations and when it is being supplied to the terminal power receiving stations.

Next, details of the maximum demand power adjustment device will be explained with reference to the block diagram of FIG. 2. The 12 power interchange and switching devices are 11
It receives 20 power outage or power restoration signals from terminal power receiving stations, and in the event of a power outage, power is transferred to 11 terminal power receiving stations. The power accommodating detection storage device 13 uses the power accommodating completion signal 21 to store that power accommodating is in progress. , 20 when the power is restored, the power interchange/switching device 12 stops power interchange and returns to the normal state. The power interchange detection storage device 13 stores the normal state.

On the other hand, the maximum demand power monitoring device of 14 is
- Input the '-11' power as the regulated power, the timing to limit the load, the alarm signal, and the 7.23°@regulated power and alarm to the load limiting device at 15. There are 23 load limiting devices! ! ii Power rectification and 22 power accommodation information In addition, 24 reserve power, which is the power contracted with the electric power company that can provide power flexibility in the event of a power outage at the 11 terminal power receiving stations, is extracted from the 16 reserve power storage devices, and the load jji 11 capacity is limited. measure.

(1) When power is not being exchanged, load restriction is required.Load restriction power = Adjusted power (2) When power is being exchanged: ■Adjusted power> In the case of reserve power, load restriction is required.Load restriction power = Adjustable car reserved power ■Adjustment! I power <In the case of reserved power, load limiting is not necessary.According to the above judgment result, when load limiting is necessary, the devices that satisfy the load limiting capacity are prioritized from the 17 load limiting target device storage devices, and 25 load limiting is performed. It is determined from the target equipment group and outputs 26 load shedding command signals to 18 equipments of each load group. Each 8i device that receives the load shedding command signal is turned off, and the maximum power demand is maintained below the target power.

Next, the operation of determining the load limiting capacity will be explained based on the flowchart of FIG.

First, in step 301, it is determined whether load limiting is necessary or not.
Judgment is made based on the adjusted power in step 3 and the content of the alarm signal. If load limiting is not required, the process ends without load limiting. When load restriction is necessary, step 302 determines whether the power receiving station is currently accommodating power to the terminal power receiving station based on the power accommodating information shown in FIG. It is.

In a normal state, in step 305, the adjusted power shown in FIG. 23 is set as load limiting power, and in step 306, load limiting is carried out. If power is being accommodated in step 302, it is determined in step 303 whether the adjusted power is within the reserve power shown in FIG. Exit immediately. If the regulated power exceeds the reserve power,
In step 304, the amount of (adjustable car reserve power) is set as load limit power, and in step 306, load limit is implemented.

According to this embodiment, since it is possible to detect whether or not power is being exchanged, when power is being exchanged, it is possible to monitor and adjust the maximum demand power by adding the reserve power for the power exchange to the target power, and to avoid unnecessary This has the effect of eliminating load limitation.

〔Effect of the invention〕

According to the present invention, regardless of whether the equipment subject to maximum demand power adjustment is in a normal state (a state in which power is not interchanged) or a state in which power is flexible, when the contract power is likely to be exceeded, By making it possible to determine the target power to be used in each state, the phenomenon of limiting the normal load during power interchange is eliminated, and the effect is that the necessary minimum optimal maximum demand power adjustment function can be achieved. There is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of equipment of a large-scale power receiving and distribution system according to an embodiment of the present invention, and FIG. 2 is a maximum demand power monitoring yard. 11... Terminal power receiving station, 12... Power interchange switching device. 13... Power accommodation detection storage device, 14... Maximum demand power monitoring device, 15... Load limiting device, 16... Reserve power storage device, 17... Load limiting target equipment storage device, No. Figure 1 '42 Figure 3

Claims (1)

[Claims] 1. It has a maximum demand power monitoring device that monitors the power used in order to keep the maximum demand power below the contracted power, and a load limiting device that limits the load currently in use and prevents the contracted power from being exceeded when a situation in which the target power is exceeded occurs. The maximum demand power adjustment device is equipped with a storage device for detecting whether power is being accommodated, and a reserve power storage device for storing reserve power, which is the power that can be used for power interchange, during power interchange. A maximum demand power adjustment device characterized in that when an excess occurs, the load limit capacity is recalculated and optimal load limit is performed.