Power management device

Abstract

To provide a power management device with which it is possible to manage exchanges of electric power in accordance with the content of abnormality.SOLUTION: The power management device includes a processor that functions so as to manage exchanges of electric power in a power system including a virtual power plant. When abnormality occurs in the power system, the processor causes the virtual power plant to carry out exchanges of electric power in only one direction to suppress power abnormality when the cause of abnormality is a voltage error; causes the virtual power plant to carry out exchanges of electric power within a range in which output variations are suppressed to a prescribed value or below when the cause of abnormality is a frequency error; and disables exchanges of electric power by the virtual power plant until it is restored when the cause of abnormality is a disconnection error or a short-circuit error.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a power management device.

Background Art

[0002] Patent Document 1 discloses a technique for managing abnormal states and fault states of a power grid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since various causes can be considered for abnormalities in the power system, a technique capable of managing power transactions according to the content of the abnormality has been demanded.

[0005] The present disclosure has been made in view of the above, and an object thereof is to provide a power management device capable of managing power transactions according to the content of an abnormality.

Means for Solving the Problems

[0006] The power management device according to the present disclosure includes a processor that functions to manage power transactions in a power system including a virtual power plant, and when an abnormality occurs in the power system, if the cause of the abnormality is a voltage abnormality, the virtual power plant is made to perform power transactions in only one direction to suppress the power abnormality; if the cause of the abnormality is a frequency abnormality, the virtual power plant is made to perform power transactions within a range where the output fluctuation is equal to or less than a predetermined value; and if the cause of the abnormality is an open-circuit fault or a short-circuit fault, power transactions by the virtual power plant are prohibited until restoration.

Effects of the Invention

[0007] According to the present disclosure, power transactions can be managed according to the content of an abnormality.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0009] A power management device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that can be replaced and are easy for those skilled in the art, or those that are substantially the same.

[0010] FIG. 1 shows an example of a power system to which a power management device according to an embodiment is applied. This power system has, as a resource side, a generator 1, a virtual power plant (hereinafter referred to as "VPP (Virtual Power Plant)") 2, and a consumer 3. Further, the power system has, as a power market side, a power generation company 4, an aggregator 5, and a power transmission and distribution company 6. The VPP 2 in the power system is implemented by the aggregator 5. Further, the VPP 2 is provided with a charge control function and a power generation control function.

[0011] In a power system as shown in FIG. 1, when an abnormality in the power system, for example, a power outage occurs, the above functions of the VPP 2 (hereinafter referred to as "VPP functions") may be stopped. In such a case, when the VPP functions are restarted after a temporary restoration of the power system, it is assumed that the possibility of a voltage drop in the power system or the occurrence of a power outage again becomes rather high.

[0012] For example, examples of the cause of an abnormality in the power system include the following. (1) Voltage abnormality (2) Frequency abnormality (3) Open-circuit fault (4) Short-circuit fault

[0013] Among the above, in the case of faults caused by the distribution network such as (3) open-circuit fault and (4) short-circuit fault, it can be expected that the cause of the fault has been removed by the inspection of the power transmission and distribution operator during restoration. On the other hand, in the case of (1) voltage abnormality or (2) frequency abnormality, it is highly likely that the abnormality has occurred due to the imbalance between the generator 1 and the load, and there is no probability that the cause of the abnormality has been removed during restoration. Therefore, when the VPP function is restarted, voltage abnormalities may occur again, and there is a risk of power outages recurring. Therefore, the power management device according to the embodiment improves the robustness of the VPP function by performing judgment of the cause of the fault and judgment of restart of the VPP function, etc.

[0014] The power management device according to the embodiment is provided, for example, in the aggregator 5 in the power system shown in FIG. 1. This power management device is realized by a general-purpose computer such as a workstation or a personal computer. Further, the power management device includes a control unit realized by a processor composed of, for example, a CPU (Central Processing Unit) and a memory (main storage unit) composed of a RAM (Random Access Memory), a ROM (Read Only Memory), etc. This control unit functions to manage the power transaction in the power system including the virtual power plant.

[0015] In the power system shown in FIG. 1, power grid information, fault information, and restoration update information are shared among the respective operators. The power grid information is information regarding the area where a fault (abnormality) has occurred and the situation of the abnormality. This power grid information is transmitted to the aggregator 5 implementing VPP2 via the power transmission and distribution operator 6.

[0016] In addition, the fault information is information regarding the "normal / abnormal" status of resources, power distribution facilities, etc. detected at the time of a fault. This fault information is shared among the respective operators (power generation operator 4, aggregator 5, power transmission and distribution operator 6) that make up the power market. Also, the restoration and update information is update information that has been confirmed to be normal for resources, power distribution facilities, etc. after an abnormality has occurred. This restoration and update information is shared among the respective operators (power generation operator 4, aggregator 5, power transmission and distribution operator 6) that make up the power market.

[0017] When an abnormality occurs in the power system, the control unit of the power management device determines whether or not to resume the VPP function according to the content of the abnormality as shown in Table 1 below.

[0018]

Table 1

[0019] As shown in Table 1 above, when the cause of the abnormality is a voltage abnormality, the control unit causes VPP2 to conduct power transactions in only one direction to suppress the power abnormality. For example, when obtaining fault information indicating that a fault has occurred because the voltage of the power transmission facility is lower than the specified value, the control unit causes VPP2 not to perform the operation on the demand side and to perform only the functions on the power generation resource side.

[0020] Also, as shown in Table 1 above, when the cause of the abnormality is a frequency abnormality, the control unit causes VPP2 to conduct power transactions within a range where the output fluctuation is below a predetermined value. For example, by suppressing the output fluctuation by VPP2 to be below a certain level, the impact on the distribution network can be reduced. Therefore, when obtaining information indicating that a fault has occurred due to a frequency abnormality, the control unit performs an operation to suppress the output fluctuation below the predetermined value even if there is a large output fluctuation request exceeding the predetermined value from the outside.

[0021] Further, as shown in Table 1 above, when the cause of the abnormality is an open-circuit fault or a short-circuit fault, the control unit prohibits power transactions by VPP2 until recovery. In this way, the power management device according to the embodiment can appropriately resume the VPP function and implement output restrictions by obtaining each resource, fault information of the power distribution network, and recovery update information, prevent the recurrence of abnormalities in the power system, and enable the early resumption of the VPP function.

[0022] The flow of the power management method executed by the power management device according to the embodiment will be described with reference to FIG. 2.

[0023] First, the control unit of the power management device determines whether an abnormality has occurred in the power system by acquiring fault information in the power system from the power transmission and distribution utility 6 or the like (step S1). In step S1, if it is determined that an abnormality has occurred in the power system (Yes in step S1), the control unit determines whether it is an abnormality in the area where the VPP function is being implemented (step S2). In step S2, if it is determined that it is an abnormality in the area where the VPP function is being implemented (Yes in step S2), the control unit refers to the fault information and checks the fault situation (step S3).

[0024] Subsequently, the control unit determines whether a part of the VPP function (for example, the charging control function) can be continued based on the confirmed fault situation (step S4). In step S4, if it is determined that a part of the VPP function can be continued (Yes in step S4), the control unit implements output restrictions on the VPP function according to the fault situation based on Table 1 above and continues the VPP function (step S5).

[0025] Subsequently, the control unit acquires restoration and update information after the occurrence of a failure from the power transmission and distribution operator 6, etc. (step S6). Subsequently, the control unit determines whether or not the power system has been restored based on the acquired restoration and update information (step S7). In step S7, if it is determined that the power system has been restored (Yes in step S7), the control unit resumes the VPP function, ends the restriction of the VPP function (step S8), and completes this process.

[0026] Here, in step S1, if it is determined that there is no abnormality in the power system (No in step S1), the control unit continues the VPP function (step S9) and completes this process. Also, in step S2, if it is determined that it is not an abnormality in the area where the VPP function is being implemented (No in step S2), the control unit continues the VPP function (step S9) and completes this process.

[0027] Also, in step S4, if it is determined that a part of the VPP function cannot be continued (No in step S4), the control unit immediately stops the VPP function (step S10) and proceeds to the process of step S6. Also, in step S7, if it is determined that the power system has not been restored (No in step S7), the control unit proceeds to step S4.

[0028] In the power management device according to the embodiment described above, by changing the mode of power transactions according to the content of the abnormality, it is possible to ensure the opportunity for power transactions while ensuring safety. Also, according to the power management device according to the embodiment, it is possible to prevent the recurrence of abnormalities in the power system and enable the early resumption of the VPP function.

[0029] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Explanation of Reference Numerals

[0030] 1 Generator 2 VPP (Virtual Power Plant) 3 Customer 4 Power Generation Company 5 Aggregator 6 Transmission and Distribution Company

Claims

【Claim 1】 A processor that functions to manage power transactions in a power system including a virtual power plant, wherein when an abnormality occurs in the power system, if either the charging control function or the power generation control function in the virtual power plant can be continued, when the cause of the abnormality is a voltage abnormality, the virtual power plant is made to conduct power transactions in only one direction to suppress the power abnormality, when the cause of the abnormality is a frequency abnormality, the virtual power plant is made to conduct power transactions within a range where the output fluctuation is equal to or less than a predetermined value, when the cause of the abnormality is an open circuit fault or a short circuit fault, power transactions by the virtual power plant are prohibited until restoration, when the power system is restored, power transactions by the virtual power plant are resumed, a power management device.

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