KR20230133679A - Renewable generator control method and apparatus in preparation for communication error - Google Patents

Abstract

The renewable generator control method for communication errors of the present invention includes system status data (generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information) linked to the power generation of the renewable generator. , a data input step of receiving at least 2 of the reactive power information of the connection point; If a communication error does not occur, controlling the renewable generator according to a central control command derived using the data input in the data input step; And when a communication error occurs, it may include performing an independent response based on at least one piece of information about the power generation amount of the renewable generator and status data of the system.

Description

Renewable generator control method and device for communication errors {RENEWABLE GENERATOR CONTROL METHOD AND APPARATUS IN PREPARATION FOR COMMUNICATION ERROR}

The present invention relates to a method and device for controlling a renewable generator independently by correcting commands when a communication error occurs in a wide-distributed power generation complex. In particular, it relates to a method and device for controlling a renewable generator in a manner that corrects a command when a communication error occurs in a widely distributed power generation complex. It relates to a method and device for controlling new and renewable generators.

As the importance of carbon neutrality emerges, interest in new and renewable energy is increasing, and in the case of new and renewable energy sources (distributed power sources), the distribution of which is accelerating recently, communication errors are generally frequent during the construction of power generation complexes and infrastructure. Because it is comprised of a wide area where it can occur, there may be errors in the generation and transmission process of each control signal.

Figure 1 is a configuration diagram showing the data acquisition structure of a renewable energy management system.

In the configuration shown, a SCADA system can be built and utilized exclusively for each control management system, but there are many monitoring targets and the variables are expanding due to the diversification and complexity of target devices.

When checking the actual EMS system targeting new and renewable energy, blank spaces due to communication errors are frequent, as shown in the case of missing data in the Jeju area as shown in Table 1 below, and there are concerns about reduced reliability due to control difficulties in such situations.

If additional compensation measures are not taken for this, inappropriate results may occur in the actual power control process.

Figure 2 is a conceptual diagram showing major considerations in large-scale wind power plants.

In the case of large-scale wind power plants, they must be organized in a wide area and individual control signals must be transmitted stably so that curtailment (output limit) and low-voltage response commands can be easily transmitted. It is necessary to devise a plan to prepare for such situations.

The structure shown in Figure 2 forms one closed-control, but system information and commands may not be reflected due to errors at specific points, and in recent centrally controlled power generation complex structures, a fatal situation may be caused. there is.

Figure 3 is a configuration diagram showing vulnerable parts when a communication error occurs in a wind power farm.

In particular, when considering a specific objective function in the wind power farm reactive power control management method, which has recently become more complex, it is difficult to follow commands when a communication error occurs in the structure shown in Figure 3, and when the communication error persists, it is flexible to voltage fluctuations in the system. This is a situation that cannot be dealt with easily, so countermeasures are needed.

Republic of Korea Registered Publication No. 10-2071469

The present invention seeks to provide a renewable generator control method and device that can obtain commands for power generation control while stably maintaining the objective function even in communication error situations.

A method of controlling a renewable generator in preparation for a communication error according to an aspect of the present invention includes system status data (generator active power output command, generator reactive power output command, generator connection point voltage, connection A data input step of receiving at least two of branch active power information and linkage point reactive power information; If a communication error does not occur, controlling the renewable generator according to a central control command derived using the data input in the data input step; And when a communication error occurs, it may include performing an independent response based on at least one piece of information about the power generation amount of the renewable generator and status data of the system.

Here, the step of performing the independent response is a method of individually changing the control command when a voltage fluctuation occurs based on information that the renewable generator can independently measure, if there is no change in the central control command due to a communication error. It can be operated as

Here, in the step of performing the independent response, the change in the central control command of the renewable generator can be estimated from the change in measured values of voltage and current at the renewable generator connection point.

Here, the step of controlling the renewable generator according to the generator control command includes: obtaining the central control command generated by the central control server for the power generation complex if there is no communication error; storing the central control command; And it may include controlling the renewable generator according to the central control command.

Here, the step of performing the independent response includes obtaining measured values of voltage and current at a connection point with the system of the renewable generator and deriving changes; predicting a change in the central control command from a change in the measured value; And it may include controlling the renewable generator according to an independent control command generated by reflecting the change in the control command to the central control command at a previous time.

Here, in the step of performing the independent response, system stability may be confirmed according to the voltage of the connection point, and reactive power may be supplied within a range that complies with the objective function of existing reactive power control.

Here, in the step of performing the independent response, the reactive power output command required for voltage recovery can be independently updated while complying with the objective function according to the following equation.

(Q _Gn is the amount of reactive power supplied by the wind generator at node n, Q _nn+1 is the reactive power flow between nodes n and n+1, Q _Cn is the amount of reactive power injection at node n resulting from the capacitance of the line, J is Jacobian matrix constant of the system, U is the connection point voltage, δ is phase angle information)

Here, in the step of performing the independent action, an independent control command can be determined according to the following equation.

(η: Share of reactive power supply)

Here, in the step of performing the independent response, the reactive power output command that minimizes current loss can be independently updated while complying with the objective function according to the following equation.

(P _ref and Q _ref represent the maximum output tracking control (MPPT) calculated value or maximum output command and reactive power command input to the wind power generator, Vn is the voltage change at point n, and r is the cable resistance)

A renewable generator control device for preventing communication errors according to another aspect of the present invention includes a communication unit for communicating with a central control server of a power generation complex; Through the communication unit, status data of the system linked to the power generation amount of the renewable generator (at least two of the generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information, and connection point reactive power information) ) a power generation complex data reception unit that receives input; a storage unit that stores status data of the system and central control commands derived from the status data; a connection point measurement value change deriving unit that derives a measurement value change at a connection point with the system of the renewable generator; a control command change calculation unit that calculates a change in the central control command expected from the change in the measured value; And if a communication error does not occur in the communication unit, it will include a power generation control unit that controls the renewable generator according to the central control command, and if a communication error occurs, performs independent control using a change in the central control command. You can.

Here, the power generation control unit may individually change the control command based on information that the renewable generator can independently measure, if there is no change in the central control command due to a communication error when a voltage fluctuation occurs.

Here, the power generation control unit estimates the change in the central control command for the renewable generator from the change in measured values of voltage and current at the renewable generator connection point, and determines the change in the control command at the central point at the previous time. The renewable generator can be controlled according to an independent control command generated by reflecting the control command.

Here, the power generation control unit may check grid stability according to the voltage of the connection point and supply reactive power within a range that complies with the objective function of existing reactive power control.

Here, the power generation control unit can independently update the reactive power output command required for voltage recovery while complying with the objective function according to the following equation.

Here, the power generation control unit may determine an independent control command according to the following equation.

When the renewable generator control method and/or device for communication errors according to the spirit of the present invention of the above-described configuration is implemented, commands for power generation control are obtained while stably maintaining the objective function even in communication error situations, and the renewable generator is There is an advantage in being able to carry out the development of.

The renewable generator control method and/or device for communication errors of the present invention has the advantage of being able to supplement turbine power generation commands when a communication error occurs during the operation of a wind farm consisting of a wide area.

The renewable generator control method and/or device for communication errors of the present invention focuses on stable operation of the system and, when voltage fluctuations occur, automatically tracks and calculates appropriate reactive power values and assigns them as commands to individual wind power generators. There are benefits to this.

The renewable generator control method and/or device for communication errors of the present invention has the advantage of being able to derive the required amount of reactive power supply through its own judgment even in an emergency when a communication error situation is input.

The renewable generator control method and/or device for communication errors of the present invention has the advantage that the reactive power command is compensated by correcting its own command after recognizing the control delay state, and the voltage at the connection point is also quickly stabilized. There is.

The renewable generator control method and/or device for communication errors of the present invention has the advantage of being able to alleviate time delay and voltage fluctuations for command correction (compensation) so as not to violate domestic regulations.

The method and/or device for controlling renewable generators against communication errors of the present invention can be used to increase stability in terms of operation of wind power plants, and has the advantage of being commercializable for existing central management systems.

Figure 1 is a configuration diagram showing the data acquisition structure of a renewable energy management system.
Figure 2 is a conceptual diagram showing major considerations in large-scale wind power generation complexes.
Figure 3 is a configuration diagram showing vulnerable parts when a communication error occurs in a wind power farm.
Figure 4 is a conceptual diagram expressing the difference in transmission of active power/reactive power commands in the central control management structure of a wind power plant.
Figure 5 is an overall conceptual diagram of an independent response plan for continuously and real-time allocating reactive power to a wind power generation system even in a communication error state.
Figure 6 is a conceptual diagram expressing the concept of correction when a communication error occurs in a situation where an objective function is introduced.
Figure 7 is a flowchart showing an embodiment of a renewable generator control method capable of independent response according to the spirit of the present invention.
FIG. 8 is a block diagram showing an embodiment of a renewable generator control device capable of performing the renewable generator control method of FIG. 7.
Figure 9 is a block diagram showing a simulation test system designed to verify the effectiveness of the communication error correction method according to the spirit of the present invention.
Figures 10a and 10b are graphs showing the voltage and reactive power of the connection point in a stable situation without communication errors.
Figures 11a to 11d are graphs showing the reactive power supply status of individual wind power generators in a wind power farm without communication errors.
Figures 12a and 12b are graphs showing the voltage and reactive power of the connection point in a communication error situation.
Figures 13a to 13d are graphs showing the reactive power supply situation of individual wind power generators in a wind power farm in a communication error state.
Figures 14a and 14b are graphs showing the voltage and reactive power of the connection point in a communication error situation after inserting the correction model.
Figures 15a to 15d are graphs showing the reactive power supply situation of individual wind power generators in a wind power farm in a communication error state after inserting a correction model.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are intended only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present invention.

When a component is mentioned as being connected or connected to another component, it can be understood that it may be directly connected to or connected to the other component, but other components may exist in between. .

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this specification, terms such as include or have are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, including one or more other features or numbers, It can be understood that the existence or addition possibility of steps, operations, components, parts, or combinations thereof is not excluded in advance.

Additionally, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

This proposed technology seeks to provide a technique to supplement commands when a communication error occurs during the operation of a wind power farm consisting of a wide area, and a method to derive the required amount of reactive power supply through independent judgment even in an emergency when a communication error situation is input.

Specifically, the present invention develops a method that effectively reflects and responds to the grid voltage while complying with the objective function, and pursues formalization so that it can be configured as a single control module. This method can be inserted into the controller of an individual wind power plant, allowing self-correction of commands based on measurement information from the wind power generator when low voltage occurs.

First, we will explain the central control/management of the wind power farm when there is no communication error.

Figure 4 is a conceptual diagram expressing the difference in transmission of active power/reactive power commands in the central control management structure of a wind power plant.

The grid operator (TSO) must maintain power balance between demand and supply according to the expected active power output of the wind power plant, and assistance from a management system to calculate and transmit active and reactive power command signals for each wind power generator is required. do.

The relevant process for commanding active and reactive power is as follows. First, the system operator (TSO) sends the required wind power generation amount (active/reactive power) to the wind farm's central management system (WFMS), and the central management system, which focuses on the wind farm connection point (PCC), controls each wind power generator. Delivers a command signal to

In the case of active power, maximum output control is generally performed, but when a Curtailment (output limit) signal is input from the operator, the maximum output amount is set.

Domestic curtailment (output limit) signals are set at intervals of 10 minutes or more, so they may not be sensitive to communication errors. However, in the case of reactive power, immediate response may be required when a low voltage situation occurs, so even short-term communication errors can affect the grid situation. It can have an impact.

In the case of reactive power, it is determined according to the objective function used by the central management system, but in the case of commonly used optimization techniques, a complex calculation process is required, so there is a difference between the general distribution method (equal distribution) and the command value. , Active response may be difficult in the event of a communication error (ripple occurs when there is a difference between the same distribution command value and the command value of the optimization technique). In particular, when a voltage drop occurs after a communication error occurs, it becomes difficult to respond to voltage recovery. .

In the present invention, when a communication error occurs, the reactive power output value that restores the voltage at the grid connection point based on the measurable value (voltage, current active power output) inside the wind power generator is actively responded to without external signal input. We want to come up with a plan.

Figure 5 shows the overall concept of an independent response plan for allocating reactive power to a wind power generation system continuously and in real time even in a communication error state.

As shown in Figure 5, the basic principle of the invention is to consider that the conventional wind power generator follows the 0 value or the previous state command value in the event of a communication error, and creates an objective function by reflecting the measurable value even in the communication error situation. This is a method that develops a self-correction algorithm to reflect a certain amount of control signals before and after a communication error and places them in the acceptance zone, and inserts it into each wind turbine controller to enable active response.

Figure 6 is a conceptual diagram expressing the concept of correction when a communication error occurs in a situation where an objective function is introduced.

In order to allocate reactive power continuously and in real time to a wind power generation system that must be configured in a wide area, a complementary method for communication status is required, which must be designed according to the characteristics of the individual control management system.

Figure 6 shows the concept of the self-correction process of the reactive power distribution method based on a general objective function. Depending on the set objective function, the reactive power supply command value required for wind power generation may be different. In addition, a situation may arise in which some turbines are unable to provide reactive power due to problems such as accidents. When changes such as voltage drops in the system occur and the command adjustment signal from the central control server is not transmitted due to a communication error, the system connection Point voltage fluctuations cannot be compensated for. In order for the compensation signal from the central control server to be transmitted smoothly regardless of the presence or absence of communication problems, a correction plan that reflects these potential conditions is needed.

V-Q Nodal analysis is commonly used to solve reactive power flow and AC voltage problems. This allows the system to be linearized according to the voltage angle and the amount of reactive power supplied, and the power equation is expressed as Equation 1 below.

Here, Q _Gn is the reactive power supply amount of the wind generator at node n, Q _nn+1 is the reactive power flow between nodes n and n+1, and Q _Cn is the reactive power injection amount at node n generated from the capacitance of the line. represents. In addition, J is the Jacobian matrix constant of the system, U is the connection point voltage, and δ is phase angle information.

Ignoring the reactive power generated in the cable, the rate of change of reactive power required at a specific node can be assigned according to a coefficient previously calculated according to Equation 1 above, for example.

Therefore, when the share (n) for reactive power supply is determined by the set objective function, the wind power generator can independently update the amount of reactive power supply (command signal) required for voltage recovery while complying with the objective function.

The changed command reflects the amount of active power supply and reactive power supply that can be measured from the wind power generator, and the voltage change on the corresponding bus, and the formula can be linearized as shown in Equation 2 below.

Therefore, considering the objective function used by the central management system, if the stake is set based on the current output demand of the wind power generator compared to the total reactive power supply demand required for the wind power farm, a method of coping with voltage fluctuations using the above equation It can be derived.

Figure 7 is a flowchart showing an embodiment of a renewable generator control method capable of independent response according to the spirit of the present invention.

The illustrated renewable generator control method is a renewable generator, and the status data of the system linked to the power generation of the wind generator (generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information, connection point A data input step (S100) of receiving at least two of the reactive power information and the operator's command information; If the communication status is checked (S200) and no communication error occurs, a central control command (active power/reactive power output command) for the generator is derived using the data input in the data input step, and the wind power generator is operated accordingly. Control step (S400); And when a communication error occurs, it may include a step (S600) of performing an independent response based on at least one piece of information about the power generation amount of the wind power generator or system status data.

The step of performing the independent response (S600) is to individually change the output control signal if there is no change in the external command signal due to a communication error when a voltage change occurs based on information that can be measured from a single wind power generator. It operates.

In a state where a communication error occurs, the control unit of the wind power generator does not receive specific information about the generation of reactive power, but can obtain measured values of voltage and current at the connection point between the wind power generator and the system.

Considering this, in the step of performing the independent response (S600), the change in the wind power generator control command is estimated from the change in the measured value of the voltage and current at the wind power generator connection point, and the change in the estimated control command is transferred. Power generation of the wind power generator can be controlled by a control command reflected in the control command at the control point. For this purpose, the control command for the wind power generator derived in step S400 of the previous control point must be stored.

In order to be able to store the above-described control command, the step of controlling the wind power generator according to the generator control command (S400) is to obtain (receive, receive) a central control command from the central control server for the power generation complex if there is no communication error. ) step (S420); Storing the central control command (S440); And it may include controlling the wind power generator according to the central control command (S460).

In response to this, the step of performing the independent response (S600) includes obtaining measured values of voltage and current at the connection point with the system of the wind power generator and deriving the change (amount) (S620); A step of predicting a change (amount) in a control command from a change in the measured value (S640); And it may include a step (S660) of controlling the wind power generator according to an independent control command generated by reflecting the change in the control command to the central control command at a previous time.

From the perspective of reactive power response, the step of performing the independent response (S600) is to check system stability according to the voltage (value) of the connection point and, within the range that complies with the goal of existing reactive power control, reactive power carry out supply. For example, the independent control command can be obtained according to Equation 1 and Equation 2 described above.

Depending on the implementation, the data input step (S100) may be performed in the central control server for the wind power farm, and in step S400, the control device of the wind power generator receives the central control command from the central control server. It can be done.

Alternatively, in the data input step (S100), various linked data may be transmitted from the central control server to the control device of each wind power generator, and the central control command of the step S400 may be generated by the control device of each wind power generator.

Depending on implementation, the generator active power output command and the generator reactive power output command may become the central control command, or may include additional commands to form the central control command.

This method of supplying reactive power is similar to directly managing commands from wind power generators from the central control device, and as a result, distribution is made to meet the purpose set by the operator of the central control device. .

Of course, it is possible to transform and apply not only the algorithm based on the above-mentioned mathematical equations, but also the results derived from other algorithms by reconstructing them into shares (ratios).

The command correction for individual wind turbines to be applied in the present invention must be constructed based on measurable data from the individual system. In the case of the formula presented in the description of the invention, it is exemplified as being written to adjust the reactive power supply command when a voltage change condition occurs.

In a more improved embodiment, a method of minimizing loss in the reactive power supply process can be introduced as the objective function of the central management system, simulating communication signals and confirming and verifying response capabilities to suggest a utilization method. That is, in the improved embodiment described later, the objective function is to minimize losses that may occur in the process of distributing reactive power supply commands to each turbine in an emergency due to the amount of reactive power to compensate for voltage fluctuations or additional requests from the system operator. Set to .

For example, the following can be introduced as an objective function.

The reactive power demand input by the system operator must be distributed to each wind turbine by a central management system. In order to consider additional objective functions in this process, we plan to continuously reflect them in the layout of the wind farm.

By setting each connection point of each wind power generator (turbine) as an allocation point, sequential distribution is possible from the point of interconnection of each array to the last turbine connection point.

First, calculate the reactive power loss up to the first allocation point and calculate the amount of reactive power required for the allocation point (Qreq), calculate the resistance component (rcon) of the turbine directly connected to the allocation point and the resistance component (rnn+) to the next section. Allocate reactive power considering 1). At this time, the proportional expression for the command (Qn) and the remaining portion (Qreqn) for the connected wind turbine can be expressed as Equation 3 below.

Equation 3 above was derived considering the reactive power component contributing to the loss, and the reactive power command is assigned to two points according to the resistance component input at each allocation point until the last turbine connection point.

In order to verify communication errors while introducing the above-mentioned reactive power allocation method (policy according to Equation 3), loss due to current was set as the objective function, and the corresponding equation is as shown in Equation 4 below.

In the above equation, P _ref and Q _ref represent the maximum output tracking control (MPPT) calculated value or maximum output command and reactive power command input to the wind power generator, and Vn represents the voltage change at point n.

By utilizing the active power flow in the above equation and the reactive power command assigned to each turbine, the resistance loss occurring in each array can be quickly predicted, and based on this, the incremental loss value can be quickly derived. When the incremental loss values become the same, the loss comparison process stops, and the command value input to each turbine is fixed. Incremental loss can be calculated using Equation 5 below.

FIG. 8 is a block diagram illustrating an embodiment of a renewable generator control device capable of performing the renewable generator control method of FIG. 7.

The illustrated renewable generator control device includes a communication unit 110 for communicating with the central control server of the power generation complex; Through the communication unit 110, status data of the system linked to the power generation amount of the renewable generator (generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information, connection point reactive power information) A power generation complex data reception unit 120 that receives input (at least 2 or more); a storage unit 130 that stores state data of the system and central control commands derived from the state data; A connection point measurement value change deriving unit 140 that derives a measurement value change at a connection point with the system of the renewable generator; a control command change calculation unit 160 that calculates a change in the central control command expected from the change in the measured value; And a power generation control unit that controls the renewable generator according to the central control command if a communication error does not occur in the communication unit 110, and performs independent control using a change in the central control command if a communication error occurs. It may include (180).

According to the idea of the present invention, the power generation control unit 180, based on information that the renewable generator can independently measure, sends a control command individually when a voltage change occurs and if there is no change in the central control command due to a communication error. You can change it.

More specifically, the power generation control unit 180 estimates the change in the central control command for the renewable generator from the change in measured values of voltage and current at the renewable generator connection point, and transfers the change in the control command. The wind power generator can be controlled according to an independent control command generated by reflecting the central control command at the time.

At this time, the power generation control unit 180 can check system stability according to the voltage of the connection point and supply reactive power within a range that complies with the objective function of existing reactive power control.

For example, the power generation control unit 180 can independently update the reactive power output command required for voltage recovery while complying with the objective function according to Equation 1 above. In this case, the power generation control unit 180 may determine an independent control command according to Equation 3 below.

In addition, the power generation control unit 180 can perform independent control by applying the objective function according to Equation 4 and Equation 5.

Next, a simulation of the effect of communication error verification for the improved embodiment described above is described.

Figure 9 shows a simulation test system designed to verify the effectiveness of a communication error correction method according to the spirit of the present invention.

In order to proceed with verification including the algorithm proposed in the present invention, a wind power farm is simulated using the EMTP simulation tool (M). In addition, real-time simulation was designed using RTDS to simulate communication error situations and designed to compensate for communication errors that occur. Since we wanted to evaluate the command correction effect from the perspective of reactive power supply, the reactive power command for voltage drop was set as a standard (±0.01 p.u.) within the range that maintains stable operation of the system. Figure 8 shows a conceptual diagram of the verification process.

In the simulation test system shown, commands generated from the central control server were configured to be transmitted to the controller (I) of each wind turbine, and data transmission using the RTDS Modbus protocol was designed. Local data that can be measured by the controller of each wind turbine are distinguished (yellow notation), and data transmission to the central controller of the wind farm management system is designed to be blocked in the middle of the simulation (red notation).

Verification was performed including the initialization time and the time required to change the command, and within the simulation, two voltage drop situations (1 second and 3 seconds) were simulated, and verification was conducted accordingly.

Figures 10a and 10b are graphs showing the voltage and reactive power of the connection point in a stable situation without communication errors.

Figures 11a to 11d are graphs showing the reactive power supply situation of individual wind power generators in a wind power farm without communication errors.

10A to 11 show a situation in which a communication error does not occur, and it can be confirmed that the reactive power signal input from the central controller is allocated by recognizing all voltage changes.

Figures 12a and 12b are graphs showing the voltage and reactive power of the connection point in a communication error situation.

Figures 13a to 13d are graphs showing the reactive power supply situation of individual wind power generators in a wind power farm in a communication error state.

If there is no compensation when a communication error occurs, situations such as those shown in FIGS. 12A to 13D occur. It can be confirmed that due to a communication error, the change in voltage cannot be reflected and the existing reactive power command is performed.

Figures 14a and 14b are graphs showing the voltage and reactive power of the connection point in a communication error situation after inserting the correction model.

Figures 15a to 15d are graphs showing the reactive power supply situation of individual wind power generators in a wind power farm in a communication error state after inserting a correction model.

If a communication error occurs after applying the present invention, a situation as shown in FIGS. 14A to 15 occurs. After recognizing the control delay state, it can be confirmed that the reactive power command is compensated through the presented controller as self-correction is performed using the proposed technique.

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

110: Department of Communications
120: Power generation complex data reception unit
130: storage unit
140: Connection point measurement value change derivation unit
160: Control command change calculation unit
180: Power generation control unit

Claims (15)

Data that receives system status data (at least two of the generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information, and connection point reactive power information) related to the generation amount of the renewable generator. input stage;
If a communication error does not occur, controlling the renewable generator according to a central control command derived using the data input in the data input step; and
When a communication error occurs, taking independent action based on at least one piece of information about the power generation amount of the renewable generator and the status data of the system.
Renewable generator control method comprising:
According to paragraph 1,
The steps for carrying out the above independent response are:
A renewable generator control method operated by individually changing the control command based on information that the renewable generator can independently measure, when a voltage change occurs and if there is no change in the central control command due to a communication error.
. According to paragraph 1,
The steps for carrying out the above independent response are:
A renewable generator control method for estimating a change in the central control command of the renewable generator from changes in measured values of voltage and current at the renewable generator connection point.
According to paragraph 3,
The step of controlling the renewable generator according to the generator control command is,
If there is no communication error, obtaining the central control command generated by the central control server for the power generation complex;
storing the central control command; and
Controlling the renewable generator according to the central control command
Renewable generator control method comprising:
According to paragraph 4,
The steps for carrying out the above independent response are:
Obtaining measured values of voltage and current at a connection point with the system of the renewable generator and deriving changes;
predicting a change in the central control command from a change in the measured value; and
Controlling the renewable generator according to an independent control command generated by reflecting the change in the control command to the central control command at a previous point in time.
Renewable generator control method comprising:
According to paragraph 1,
The steps for carrying out the above independent response are:
A renewable generator control method that confirms system stability according to the voltage of the connection point and supplies reactive power within a range that complies with the objective function of existing reactive power control.
According to paragraph 1,
In the step of carrying out the above independent response,
A renewable generator control method that independently updates the reactive power output command required for voltage recovery while complying with the objective function according to the equation below.

(Q _Gn is the amount of reactive power supplied by the wind generator at node n, Q _nn+1 is the reactive power flow between nodes n and n+1, Q _Cn is the amount of reactive power injection at node n resulting from the capacitance of the line, J is Jacobian matrix constant of the system, U is the connection point voltage, δ is phase angle information)
In clause 7,
In the step of carrying out the above independent response,
A renewable generator control method that determines an independent control command according to the equation below.

(η: Share of reactive power supply)
According to paragraph 1,
In the step of carrying out the above independent response,
A renewable generator control method that independently updates the reactive power output command that minimizes current loss while complying with the objective function according to the equation below.


(P _ref and Q _ref represent the maximum output tracking control (MPPT) calculated value or maximum output command and reactive power command input to the wind power generator, Vn is the voltage change at point n, and r is the cable resistance)
a communication unit for communicating with the central control server of the power generation complex;
Through the communication unit, status data of the system linked to the power generation amount of the renewable generator (at least two of the generator active power output command, generator reactive power output command, generator connection point voltage, connection point active power information, and connection point reactive power information) ) a power generation complex data reception unit that receives input;
a storage unit that stores status data of the system and central control commands derived from the status data;
a connection point measurement value change deriving unit that derives a measurement value change at a connection point with the system of the renewable generator;
a control command change calculation unit that calculates a change in the central control command expected from the change in the measured value; and
If a communication error does not occur in the communication unit, a power generation control unit that controls the renewable generator according to the central control command, and if a communication error occurs, performs independent control using a change in the central control command.
A renewable generator control device comprising a.
According to clause 10,
The power generation control unit,
A renewable generator control device that individually changes a control command based on information that the renewable generator can independently measure, when a voltage change occurs and if there is no change in the central control command due to a communication error.
According to clause 10,
The power generation control unit,
Estimating the change in the central control command for the renewable generator from the change in measured values of voltage and current at the renewable generator connection point,
A renewable generator control device that controls the renewable generator according to an independent control command generated by reflecting the change in the control command to the central control command at a previous time.
According to clause 12,
The power generation control unit,
A renewable generator control device that verifies system stability according to the voltage of the connection point and supplies reactive power within a range that complies with the objective function of existing reactive power control.
According to clause 13,
The power generation control unit,
A renewable generator control device that independently updates the reactive power output command required for voltage recovery while complying with the objective function according to the equation below.

(Q _Gn is the amount of reactive power supplied by the wind generator at node n, Q _nn+1 is the reactive power flow between nodes n and n+1, Q _Cn is the amount of reactive power injection at node n resulting from the capacitance of the line, J is Jacobian matrix constant of the system, U is the connection point voltage, δ is phase angle information)
According to clause 14,
The power generation control unit,
A renewable generator control device that determines an independent control command according to the equation below.

(η: Share of reactive power supply)