JP2020178405A - Generator control status determination device and method - Google Patents

Abstract

To reduce active power loss in a wind farm WF within the capacity constraint of a phase adjustment facility while satisfying a voltage state by coordinated control of the phase adjustment facility and a wind power generator since the phase adjustment facility has a remaining capacity (a difference between a current value and upper and lower limit values in a reactive power compensation amount of the phase adjustment facility) depending on wind conditions.SOLUTION: A determination device of a generator control state in an electric station, connected to an electric power system at a linkage point, including phase adjustment facility and a generator, includes a determining unit of a voltage control state, to which at least a reactive power compensation amount in the phase adjustment facility and a voltage control state in the generator are input, for obtaining an active power transmission loss in the electric station, referring to a remaining capacity of the phase adjustment facility and the voltage control state of the generator, and determining a voltage control state with a small active power loss by repeated tidal current calculations.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control state determining device and method for a generator.

In general, the quality of the power system is maintained by constant voltage and constant frequency. Among them, the technical background of the voltage surface (voltage / reactive power control) according to the present invention will be described below.

The purpose of voltage / reactive power control is to maintain reactive power balance, reduce transmission loss, and maintain voltage stability in the backbone system. In the first maintenance of reactive power balance, the reactive power balance is adjusted appropriately. In the second transmission loss reduction, equipment that supplies reactive power is installed near the reactive power demand, and the reactive power flow of the transmission line is reduced to reduce the transmission loss. The transmission loss increases in proportion to the square of the current, that is, the sum of the squares of the active power and the reactive power. In the third maintenance of voltage stability, a synchronous phase adjuster that controls voltage and reactive power and a static reactive power compensation device are installed to maintain voltage stability. Voltage stability becomes a problem due to long-distance large-power transmission due to remote power supply and uneven distribution, increase in reactive power loss, and change in load characteristics (increase in constant power load).

The purpose of voltage / reactive power control in the local system is to maintain proper voltage / reactive power. After setting the reference voltage at the main part of the system, the voltage is controlled so as to be within the constraint condition.

Voltage / reactive power control equipment can be divided into two types: generator equipment and power transportation equipment equipment.

The first is the voltage / reactive power control device of the generator. The generator can adjust the reactive power by adjusting the exciting current in addition to supplying the active power. The reactive power control modes of the generator include AVR (constant terminal voltage control by adjusting the exciting current), APFR (constant power factor control according to the generator output), AQR (constant reactive power control according to the generator output), and so on. There is AVQC (reactive power control while keeping the terminal voltage constant by adjusting the tap of the transformer for boosting).

The second is voltage / reactive power control equipment for power transportation equipment. The voltage / reactive power control equipment of power transportation equipment is further divided into two types, one is phase adjustment equipment that generates or absorbs reactive power, and is a parallel capacitor (SC) and shunt reactor (ShR). , Static reactive power compensator (SVC), synchronous phase adjuster (RC), etc. The installation location of the phase adjustment equipment is determined in consideration of proper voltage maintenance, transmission loss reduction, installation cost, voltage maintenance in the event of a single equipment accident, and the like. The installed capacity of the phase adjustment equipment is determined so that the appropriate reactive power balance and the appropriate voltage can be maintained, and the appropriate voltage can be maintained even in the event of a single equipment accident. At the same time, consideration is given so that voltage stability can be maintained during the heavy load period. The capacity of a single machine is determined in consideration of the fact that voltage fluctuations when the phase adjustment equipment is turned on and off do not affect the system.

The other of the voltage / reactive power control equipment of the power transportation equipment is the equipment that changes the voltage ratio, and there is a tap changer (LTC) at load. LTC is adopted in consideration of the fact that there is an adjustment range required to maintain the lower system voltage at an appropriate value with respect to the voltage fluctuation of the upper system, and that the voltage fluctuation at the time of 1 tap switching is within the allowable value. ing.

Currently, a voltage / reactive power control system (VQC) has been introduced for the purpose of introducing appropriate maintenance of system voltage, reduction of burden on operators, reduction of unnecessary operation of power equipment, reduction of transmission loss, and the like.

Behind the introduction of VQC is the introduction of a system of thermal power machines with a large reactive power adjustment capacity, the expansion of the amount of information collected at control stations due to unmanned power generation and substations and centralized control, and the adoption of a digital transmission method that can collect large amounts of information. , Online application of system analysis technology due to computer development, increase in voltage adjustment work volume of operators, etc.

The VQC method includes a "central control method" and an "individual control method". Of these, the central control method collects multiple electrical station information (active power P, reactive power Q, voltage V, etc.) in the central device, and transfers the judgment results determined by the central device to multiple individual voltage / disabled power control devices. Coordinated control is carried out by giving and controlling various parts of the power system. The voltage and reactive power of the power system are controlled in one place or by a hierarchical control system. Further, the individual control method is divided into a time schedule operation and an individual VQC method. In the individual control method, the voltage / reactive power control device is controlled voluntarily and individually so as to maintain the reference voltage given in advance at each electric station.

The control targets of the voltage / reactive power control system VQC are as follows. In the 500kV system, the reference voltage at the interconnection point with others is set, and the control is performed with the goal of maintaining the busbar voltage at both ends and reducing the reactive power at the equipment demarcation point to zero as much as possible. In the 275 or less kV system, control is performed with the goals of maintaining and suppressing fluctuations in the appropriate voltage of the load supply system, optimizing the reactive power balance, and reducing transmission loss (setting to increase the voltage within the lower limit voltage in operation).

In the central control method, the algorithm used for the voltage / reactive power control system VQC generally combines the voltage deviations from the target values at multiple monitoring points into one evaluation function and calculates the device control amount to minimize this. However, a control method is adopted. As the evaluation function, the voltage deviation of the monitoring point and the minimization of the transmission loss of the monitoring transmission line are often adopted. In the individual control method, the VV control method is often adopted in order to properly maintain the primary and secondary bus voltage and the transformer reactive power.

The function of reducing transmission loss has been incorporated into the voltage / reactive power control system VQC and has been introduced by many companies. Among them, the transmission loss is calculated online, the voltage / reactive power control device is controlled to minimize the transmission loss, the reactive power is compensated at the point where the reactive power is consumed, and the system is excessively disabled. There is a function to prevent the flow of power. However, since the control to maintain the bus voltage of each electric station in an appropriate range is prioritized, the actual situation is that the transmission loss reduction function is not functioning properly. This function is important from the viewpoint of reducing power costs, and it is desired to develop a control algorithm that satisfies both maintenance of appropriate voltage and reduction of transmission loss.

Next, the technical background of wind power generators, which have been attracting attention from the viewpoint of environmental protection in recent years, will be described below. In the following description, the term generator means a wind power generator, but it should be noted that the subject matter of the present invention is not limited to wind power generators.

The wind power generator is connected to the power system and supplies the generated power to the power system. When connecting a wind farm (WF) to a system, it is necessary to suppress voltage fluctuations within 2% of the constant voltage (voltage specified value).

In order to adjust the voltage, it is common to install a phase adjustment facility that can adjust the reactive power at the grid connection point.

In addition, the wind power generator itself can adjust the voltage by adjusting the reactive power. Therefore, it is very important to control the voltage and reactive power by the wind power generator in consideration of the state of the phase adjustment equipment.

In the present technical field, the system voltage control state determining device of Patent Document 1 is known. According to Patent Document 1, it is described that voltage fluctuation is suppressed by controlling the output of a distributed power source.

Further, in the present technical field, a control method and a system of a distributed power source group of Patent Document 2 are known. According to Patent Document 2, active power fluctuation of the entire wind power generator group is performed by coordinating control of each distributed power source from the output voltage value and output power value of each distributed power source and appropriately distributing active power and ineffective power. Is stated to be minimized.

Further, in the present technical field, the renewable energy power generation system of Patent Document 3 is known. According to Patent Document 3, when the voltage of the wind farm WF is smaller than a predetermined value based on the information in the wind farm WF in the control device connected to the transmission line, the synchronous phase adjuster outputs to the wind farm WF ineffective. It is stated to control power.

Patent No. 6416064 JP-A-2009-239990 Japanese Unexamined Patent Publication No. 2013-198201

However, in the system voltage control state determining device of Patent Document 1, the control method and system of the distributed power source group of Patent Document 2, and the renewable energy power generation system of Patent Document 3, the parameters of the constant voltage control AVR and the constant power factor control APFR are set. Since there are innumerable numbers, it is difficult to determine the control state that reduces the active power loss in the wind farm WF.

Therefore, in the present invention, since the phase adjusting equipment has a surplus capacity (difference between the current value and the upper and lower limit values in the reactive power compensation amount of the phase adjusting equipment) depending on the wind condition, the phase adjusting equipment and the wind power generator are coordinated to control the power. The purpose is to reduce the active power loss in the wind farm WF within the capacity constraint of the phase adjustment equipment while satisfying the voltage state.

In order to solve the above problems, the present invention is a control state determining device for a generator in an electric station connected to an electric power system at a linking point including a phase adjusting facility and a generator, and at least compensation for invalid power in the phase adjusting facility. Input the amount and the voltage control state in the generator, obtain the active power transmission loss in the electric station, refer to the surplus capacity of the phase adjustment equipment and the voltage control state of the generator, and repeat the voltage control with a small active power loss by calculating the power flow. It is characterized by including a voltage control state determining unit for determining a state.

Further, the present invention is a method for determining the control state of a generator in an electric station connected to an electric power system at a linking point including a phase adjusting facility and a generator, and at least the amount of ineffective power compensation in the phase adjusting facility and the generator. It is characterized in that the voltage control state and the active power transmission loss in the electric station are obtained, the surplus capacity of the phase adjustment equipment and the voltage control state of the generator are referred to, and the voltage control state with a small active power loss is determined.

According to the present invention, the voltage with a small active power loss is obtained by repeating the power flow calculation while changing the control state only in the direction of reducing the active power loss by referring to the surplus capacity of the phase adjusting facility and the voltage control state of the wind power generator. The control state can be determined.

The conceptual diagram which shows the control state determination apparatus 10 of the generator which concerns on Example 1 of this invention, and the hardware composition example of the electric power system to which it applies. The figure which shows the functional configuration example of the control state determination apparatus of the generator which concerns on Example 1. FIG. The figure which shows the flowchart which shows the process of the control state determination apparatus of a generator. The figure which shows the display example in the display part of the control state determination device of a generator. The figure which shows the functional configuration example of the control state determination apparatus of the generator which concerns on Example 2. FIG. The flowchart which shows the process of the control state determination apparatus of the generator which concerns on Example 2. The figure which shows the example of the voltage adjustment priority of the control state determination device of a generator. The figure which shows the functional configuration example of the control state determination apparatus of the generator which concerns on Example 3. FIG. The flowchart which shows the process of the control state determination apparatus of the generator which concerns on Example 3. The figure which shows the functional configuration example of the control state determination apparatus of the generator which concerns on Example 4. FIG. The flowchart which shows the process of the control state determination apparatus of the generator which concerns on Example 4. The figure which shows the functional configuration example of the control state determination apparatus of the generator which concerns on Example 5. FIG. The flowchart which shows the process of the control state determination apparatus of the generator which concerns on Example 5.

Hereinafter, examples suitable for carrying out the present invention will be described. It should be noted that the following is merely an example, and the invention itself is not intended to be limited to the following specific contents.

The generator control state determining device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a conceptual diagram showing an example of a hardware configuration of a generator control state determining device 10 according to the present embodiment and an electric power system to which the device 10 is applied. The upper part of FIG. 1 shows a configuration example of the electric power system, and the lower part of FIG. 1 shows a configuration example of the control state determining device 10 of the generator.

The power system illustrated in the upper part of FIG. 1 includes an infinite system (giant system) 100, a node (bus) 110, a transformer 120, a plurality of generators 130, a power transmission line 140, and a load 150. In FIG. 1, node numbers (N1 to N6, N100 to N400) are appropriately assigned to the nodes 110. Various measuring instruments (not shown) are appropriately installed in the node 110 according to the purpose of protection, control, monitoring, and the like of the electric power system. These measuring instruments include not only the measuring instrument of the state quantity in the power system but also the measuring instrument of the state quantity and the control state in the generator. The plurality of generators 130 and the load 150 are interconnected with each other via a node 110, a transformer 120, a power transmission line 140, and the like.

In the power system of FIG. 1, the target of control by the present invention is a generator 130, and although not shown in these generators, a phase adjustment facility 160 is installed at a node 110. In the case of the wind farm WF, the phase adjustment equipment 160 is installed at the node 110, but the present invention can be applied as long as the phase adjustment equipment and the generator are used together. In other words, it can be said that the present invention is applicable to an electric station connected to an electric power system at a linking point including a phase adjusting facility and a generator. In the following cases, it is assumed that the electric station is a wind farm WF.

The communication network 300 connects each part of the electric power system to the control state determination device 10 of the generator illustrated in the lower part of FIG. For example, the measurement data measured by the measuring instrument installed at the node 110 of the power system is converted into a signal and sent to the communication unit 23 of the control state determination device 10 of the generator described later via the communication network 300. Thus, from the measuring instrument, various state quantities in the power system and the back power supply at the node are collected in time series by the control state determining device 10 of the generator.

The control state determination device 10 of the generator is composed of a computer system, and a display unit 21 such as a display device, an input unit 22 such as a keyboard and a mouse, a communication unit 23, a processor 24, a memory 25, and various database DBs are bused. It is connected to line 26.

The display unit 21 may be configured to use, for example, a printer device, an audio output device, or the like in place of the display device or in combination with the display device.

The input unit 22 can be configured to include at least one of a keyboard switch, a pointing device such as a mouse, a touch panel, a voice instruction device, and the like.

It includes a communication unit 23, a circuit for connecting to a communication network, and a communication protocol.

The processor 24 executes a calculation program to instruct image data to be displayed, search data in various databases, and the like. It may be configured as one or more semiconductor chips, or as a computer device such as a computing server.

The memory 25 is configured as, for example, a RAM, and stores a computer program, calculation result data, image data, and the like required for each process. The screen data stored in the memory 25 is sent to the display unit 21 and displayed.

The database DB includes a phase adjustment equipment invalid power compensation amount database DB1, a voltage control state current value database DB2, a system state database DB3, an active power loss database DB4, and a voltage control state database DB5. The data stored in these database DBs is the state quantity directly obtained from the measuring instrument installed in the node, and further is the state quantity secondarily obtained by the estimation process using the state quantity. Further, it is a state quantity as an intermediate product in the processing in the control state determining device 10 of the generator, and further, it is a state quantity as a final product in the processing in the control state determining device 10 of the generator.

FIG. 2 is a conceptual diagram showing a functional configuration example of the control state determination device 10 of the generator according to the first embodiment. The generator control state determination device 10 includes a phase adjustment equipment invalid power compensation amount database DB1, a voltage control state current value database DB2, a system state database DB3, an active power loss database DB4, a voltage control state database DB5, and a voltage control state determination unit. 11. The tidal current calculation unit 12 is provided.

In the explanation of the background technology, it was mentioned that the voltage / ineffective power control equipment is divided into the equipment of the generator and the equipment of the power transportation equipment, and the equipment of the power transportation equipment includes the phase adjustment equipment. As is clear from the above database DB configuration, in the present invention, the voltage control state current value database DB2 for the generator, the phase adjustment equipment invalid power compensation amount database DB1 for the phase adjustment equipment, and the system for the system state A system configuration is adopted in which the status database DB3 is associated and input.

As a result, the adjustable amount of reactive power by the generator and the phase adjustment equipment at the node having the back power supply can be grasped together with the system state. These data include, for example, a group of data measured at a wind farm node equipped with a generator and phase adjustment equipment. When managing a plurality of wind farms, these data groups are prepared for each wind farm.

The reactive power compensation amount in the phase adjusting equipment installed in the power system is stored in the phase adjusting equipment reactive power compensation amount database DB1 when focusing on the phase adjusting equipment as the voltage / reactive power control equipment. For example, when the generator is a wind power generator, the phase adjustment equipment 160 is often attached to the generator, but the installed capacity of the phase adjusting equipment, the capacity used at the present time, etc. are stored and stored. There is. The reactive power compensation amount indicates how much reactive power can be supplied in the advancing or lagging direction and whether it can be compensated in the current operating state of the phase adjusting facility.

When the generator is focused on as a voltage / reactive power control device, the current value database DB2 of the voltage control state stores the control mode of the wind power generator and the current values of its parameters. According to the explanation of the background technology, the control modes of the wind generator include AVR (constant terminal voltage control by adjusting the exciting current), APFR (constant force rate control according to the generator output), and AQR (constant force rate control according to the generator output). (Constant control of disabled power), AVQC (Control of disabled power while keeping the terminal voltage constant by adjusting the tap of the transformer for boosting), etc., and these distinctions and the current values of the parameters are stored for each generator of the power system. Will be done.

The system status database DB3 stores system monitoring information such as active power P, reactive power Q, and voltage V at each node of the power system. The data stored in the databases DB1, DB2, and DB3 are input data directly or indirectly taken from the measuring instrument installed in the node.

The active power loss database DB4 stores the active power loss in the transmission line of the power system. This active power loss is positioned as a state quantity as an intermediate product or a final product in the processing in the control state determining device 10 of the generator. In this case, the active power loss in the transmission line of the power system means the active power loss between the generator in the wind farm and the interconnection point to the power system.

The voltage control state database DB5 stores the control mode of the wind power generator (constant voltage control AVR mode, etc.) and the current values of its parameters. The current values of this control mode and its parameters are positioned as the state quantity as the final product in the processing by the control state determining device 10 of the generator.

The voltage control state determination unit 11 inputs the phase adjustment equipment reactive power compensation amount, the voltage control state, and the active power transmission loss, determines the optimum value of the voltage control state, and determines the active power loss and the voltage control state. Output the optimum value.

The power flow calculation unit 12 inputs the system state and the voltage control state, executes the power flow calculation, and outputs the active power transmission loss and the reactive power compensation amount.

These series of processes by the voltage control state determination unit 11 and the tidal current calculation unit 12 are executed in units of electric stations (in this case, units of wind farm). Therefore, when a plurality of wind farms are to be managed, it will be carried out for each wind farm.

FIG. 3 shows a flowchart of processing of the control state determination device of the generator.

In the processing step S1, the system state (observed value) is acquired. The system state is appropriately stored in the system state database DB3.

In the processing step S2, the active power loss of the power system forming the wind farm is calculated from the observed value or the state estimation result. To calculate the active power loss, it may be calculated from the difference between the active power flow at the wind farm WF interconnection point (system connection point) and the total output of the wind power generator, or the sum of the active power loss of each transmission line. It may be calculated from. This calculates the active power loss in the wind farm. This means that the active power loss in the electric station was calculated.

In the process step S3, the phase adjustment equipment reactive power compensation amount and the current value (observed value) of the voltage control state in the wind farm are acquired. The phase-adjusting equipment reactive power compensation amount and the voltage control state are appropriately stored in the phase-adjusting equipment reactive power compensation amount database DB1 and the voltage control state current value database DB2. By comparing the maximum value and the minimum value with respect to the current value of the reactive power compensation amount of the phase adjusting equipment, it is possible to confirm how much reserve capacity is available in each direction. For example, for the phase adjustment equipment, the reactive power compensation amount in the forward direction and the lag direction is determined respectively.

In process step S4, the voltage control state is selected for the generator in the wind farm. At the time of selection, the control mode (constant voltage control AVR mode, etc.) is switched, and its parameters are changed. When determining the valid parameters, the search may be linear or random.

In the processing step S5, the active power loss and the phase adjustment equipment reactive power compensation amount are calculated by the power flow calculation. In this case, the power flow calculation is such that the reactive power compensation amount of the phase adjustment equipment in the wind farm and the current value (observed value) of the voltage control state are fixed values, and the voltage control state of the generator in the wind farm is variable. Therefore, a combination of a plurality of active power losses and the reactive power compensation amount of the phase adjusting equipment for each voltage control state of the generator is calculated.

In the processing step S6, it is determined whether or not the combination of the plurality of active power transmission losses and the phase adjusting equipment reactive power compensation amount for each voltage control state of the generator obtained in the processing step S5 violates the operational restrictions. Operational restrictions are overloads, voltage deviations, and the like. If the violation is made, the process proceeds to process step S7. If there is no violation, the process proceeds to process step S8.

In the process step S7, the operational restriction is resolved. For each operational constraint violation, resolve the violation by various commonly known methods. After the resolution, the process proceeds to process step S5.

In the processing step S8, if the calculated value of the active power loss (this time) <the calculated value of the active power loss (optimum value), the process proceeds to the processing step S9. If the calculated value of the active power loss (this time) <the calculated value of the active power loss (optimum value), the process proceeds to process step S10.

In the process step S9, the optimum value of the voltage control state is updated from the previous value (optimum value up to the previous time) to the calculated value of this time.

In the process step S10, when the calculation condition is satisfied, the flow is terminated. If the calculation condition is not satisfied, the process returns to process step S4. The calculation end condition is set, for example, as the lapse of a certain time, and the voltage control state with the smallest active power loss is determined as the optimum value of the voltage control state at the timing when the current time elapses.

According to the above series of processing steps, the operation of the generator (voltage control state) that can minimize the active power is determined when the operation of the generator is changed in the state where the phase adjustment equipment and the voltage control state are fixed. It can be said that it is a thing. In other words, the voltage control state of the generator that can minimize the active power while making the best use of the remaining capacity of the phase adjustment equipment is determined.

FIG. 4 shows a display example on the display unit of the control state determination device of the generator. In the display section, for the wind farm, the previous (optimum value), active power loss (including total wind turbine output, interconnection point tidal current value, etc.), phase adjustment equipment reserve, and control mode of each wind power generator in the candidates. The parameters are displayed. If the active power loss in the candidate is smaller than the previous active power loss, the control mode of the wind power generator in the candidate and its parameters may be automatically adopted, or it can be changed by manually pressing the candidate selection button. Is also good.

According to the first embodiment, the remaining capacity of the phase adjusting equipment (difference between the current value and the upper and lower limit values in the reactive power compensation amount of the phase adjusting equipment) and the voltage control state of the wind power generator are referred to, and the active power loss is reduced. By repeating the power flow calculation while changing the control state only, the voltage control state with small active power loss can be determined.

The generator control state determining device according to the second embodiment of the present invention will be described with reference to FIG. The description that overlaps with the content described in the first embodiment will be omitted.

FIG. 5 shows the control state determination device 10 of the generator of this embodiment. The difference from the control state determination device of the generator of the first embodiment is that the voltage adjustment priority database DB6 is further provided.

The voltage adjustment priority database DB 6 stores the priority of voltage adjustment.

FIG. 6 shows the processing of the generator control state determining device according to the second embodiment, in which step S4 of the flowchart showing the entire processing of the generator control state determining device of FIG. 3 is changed to step S4'described later. An example of a flowchart is shown.

In this processing step S4', which is a difference from the first embodiment, the voltage control state is selected using the voltage priority.

FIG. 7 shows an example of displaying the voltage adjustment priority. When determining the voltage control state of the wind power generator, the control mode (constant voltage control AVR mode, etc.) and its parameters are selected from the generators having the highest priority. It shows that the priority of the generator A is 10th, the priority of the generator B is 1st, and the priority of the generator Z is 5th. This priority may be created by sensitivity analysis using a certain cross section, or may be created using past data.

In the first embodiment, when there are 100 generators in the wind farm, the power flow calculation in which the control mode of the wind power generator (constant voltage control AVR mode, etc.) and its parameters are variable is repeatedly executed for all 100 generators. However, in the second embodiment, it is possible to execute the upper machine whose priority is determined in advance, so that it can contribute to the reduction of the calculation load and the reduction of the calculation time.

The generator control state determining device according to the third embodiment of the present invention will be described with reference to FIG. The description that overlaps with the content described in the first embodiment will be omitted.

FIG. 8 shows the control state determination device 10 of the generator of this embodiment. The difference from the generator control state determination device of the first embodiment is that the generator prediction value database DB7 is further provided. The generator predicted value database DB7 stores the generator predicted value.

Then, the tidal current calculation unit 12 uses the generator predicted value in addition to the system state when calculating the tidal current, and calculates the predicted value in the near future for the active power transmission loss and the reactive power compensation amount of the phase adjustment equipment. Realize tidal current calculation including future trends.

FIG. 9 shows the generator according to the third embodiment in which step S1 of the flowchart showing the entire process of the control state determination device of the generator of FIG. 3 is changed to the system state (observed value) and the process step S1'described later. An example of a flowchart showing the processing of the control state determination device is shown. In this processing step S1', which is a difference from the first embodiment, the system state (observed value) and the generator predicted value are acquired.

The generator control state determining device according to the fourth embodiment of the present invention will be described with reference to FIG. The description that overlaps with the content described in the first embodiment will be omitted.

FIG. 10 shows the control state determination device 10 of the generator of this embodiment. The difference from the control state determining device of the generator of the first embodiment is that the update cycle changing unit 13 is further provided.

The update cycle changing unit 13 inputs the system state, changes the update cycle, and outputs the update cycle. For example, it is updated when the sum of the outputs of wind power generation or the tidal current at the interconnection point changes to a certain value or more.

FIG. 11 is an example of a flowchart showing the processing of the control state determining device of the generator according to the fourth embodiment, in which the processing step S11 described later is added to the flowchart showing the entire processing of the control state determining device of the generator of FIG. Represents.

In the present processing step S11, which is a difference from the first embodiment, the update cycle is changed.

According to the fourth embodiment, by changing the update cycle, it is possible to reduce the arithmetic processing in the control state determination device of the generator.

The generator control device according to the fifth embodiment of the present invention will be described with reference to FIG. The description that overlaps with the content described in the first embodiment will be omitted.

FIG. 12 shows the control state determination device 10 of the generator of this embodiment. The difference from the generator control state determination device of the first embodiment is that the voltage control state current value database DB2 is changed to the voltage control state command value database DB8 to be used as the generator control device.

The voltage control state command value database DB 8 stores the voltage control state command.

FIG. 13 shows an example of a flowchart showing the processing of the generator control device in which the processing step S12 described later is added to the flowchart showing the entire processing of the generator control device of FIG.

In the present processing step S12, which is a difference from the first embodiment, the voltage control state is instructed to the generator.

The first to fourth embodiments are device configurations in which the control state determining device of the generator is positioned as a so-called support device, and the operator is expected to check the displayed contents and adjust the generator. On the other hand, it can be said that the fifth embodiment constitutes a control device that links the determination result to the direct control.

DB1: Phase adjustment equipment invalid power compensation amount database DB2: Voltage control status current value database DB3: System status database DB4: Active power loss database DB5: Voltage control status database DB6: Voltage adjustment priority database DB7: Generator predicted value database DB8 : Voltage control state command value database 10: Generator control state determination device 11: Voltage control state determination unit 12: Power flow calculation unit 13: Update cycle change unit 21: Display unit 22: Input unit 23: Communication unit 24: Processor 25 : Memory 26: Bus line 100: Infinite system (giant system)
110: Node 120: Transformer 130: Generator 140: Transmission line 150: Load 160: Phase adjustment equipment 300: Communication network

Claims (7)

It is a control state determination device for a generator in an electric station connected to the power system at a linking point, including a phase adjustment facility and a generator.
At least the amount of ineffective power compensation in the phase adjustment equipment and the voltage control state in the generator are input, the active power transmission loss in the electric station is obtained, and the surplus capacity of the phase adjustment equipment and the voltage control state of the generator are referred to. , A generator control state determination device comprising a voltage control state determination unit that determines a voltage control state with a small active power loss by repeated power flow calculation. The generator control state determining device according to claim 1.
The electric station is a generator control state determining device, characterized in that it is a wind farm composed of a plurality of wind power generators. The generator control state determining device according to claim 2.
A generator control state determining device, characterized in that a priority is given to a voltage control state in the generator, and processing of a voltage control state determining unit is executed from a generator having a higher priority. The generator control state determining device according to any one of claims 1 to 3.
The voltage control state determining unit is a generator control state determining device, characterized in that a voltage control state having a small active power loss is determined by a prediction process based on a generator predicted value. The generator control state determining device according to any one of claims 1 to 4.
The voltage control state determining unit is a generator control state determining device, characterized in that an update cycle is changed by inputting a system state and a voltage control state having a small active power loss is determined. The generator control state determining device according to any one of claims 1 to 5.
The voltage control state determination unit gives the generator a voltage control state with a small active power loss obtained by repeated power flow calculation as a voltage control state command value, and controls the voltage control state of the generator. apparatus. It is a method for determining the control state of a generator in an electric station connected to an electric power system at a linking point including a phase adjustment facility and a generator.
At least the amount of ineffective power compensation in the phase adjustment equipment, the voltage control state in the generator, and the active power transmission loss in the electric station are obtained, and the surplus capacity of the phase adjustment equipment and the voltage control state of the generator are referred to and effective. A method for determining a control state of a generator, which comprises determining a voltage control state with a small power loss.

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