Coordinated optimization control method of new energy and phase modifier for long-distance weak sending end power grid

Abstract

The invention provides a coordination optimization control method of new energy and a phase modifier for a long-distance weak sending end power grid, and belongs to the technical field of coordination control. The method comprises the steps of 1, acquiring power transmission parameter data in a power transmission process of a target new energy unit; 2, judging the voltage drop condition of the new energy grid-connected point by analyzing the relationship between the amplitude of the voltage of the new energy grid-connected point and the rated voltage; 3, judging a short-circuit fault of the power grid and generating a coordinated optimization control strategy by combining the power and voltage drop conditions of the phase modifier; 4, based on the coordinated optimization control strategy and in combination with the voltage drop condition of the grid-connected point, generating a control signal for the new energy unit and controlling the new energy unit; and 5, obtaining an adjustment result after coordinated optimization control, and judging whether the adjustment result meets the optimization expectation or not. And the regulation and control capability of the power grid on the new energy unit is improved, and efficient and reliable operation of a power system can be realized.

Description

Technical Field

[0001] The present invention relates to the field of coordinated control technology, and in particular to a coordinated optimization control method for renewable energy and phase regulators used in a long-distance weak-transmitting-end power grid. Background Art

[0002] At present, in the new power system, when a high proportion of new energy is sent over long distances via long-chain transmission lines, due to its weak grid structure and relatively low short-circuit characteristics, a certain amount of dynamic reactive power compensation equipment is usually installed in large-scale new energy bases to suppress the wide-band oscillation caused by the coupling of new energy and the system, maintain the voltage stability of the grid connection point, and improve the frequency response characteristics of the sending-end power grid. Compared with power electronic reactive power compensation devices that rely on control systems, synchronous phase regulators, as rotating equipment, can not only provide short-circuit capacity for the sending-end power grid, but also have good transient dynamic characteristics. Therefore, in actual projects, phase regulators of a certain capacity are usually installed near the new energy collection area.

[0003] However, phase modulators are essentially synchronous machines. When a large number of phase modulators are installed near a renewable energy base with relatively low short circuit potential, and a short circuit fault occurs at the far end of the renewable energy grid connection point, if the renewable energy control is not properly coordinated during the fault, the actual active output of the renewable energy may not decrease. As a result, the phase modulators will bear the additional power disturbance brought by the renewable energy during the fault, causing their rotors to accelerate, and the phase modulators may suffer from synchronous instability.

[0004] Therefore, the present invention proposes a coordinated optimization control method for renewable energy and phase regulators used in a long-distance weak-transmitting-end power grid. Summary of the invention

[0005] The present invention provides a coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid, which is used to obtain parameter data during power transmission, analyze voltage changes at renewable energy grid connection points and phase-shifting devices power, identify grid short-circuit faults, and generate a coordinated optimization control strategy. The control algorithm adjusts the output of renewable energy units based on voltage drop conditions. Finally, by evaluating the conformity of the adjustment results with the optimization expectations, the stable operation and optimized performance of the system are ensured. This process improves the power grid's ability to regulate renewable energy units, and helps to achieve efficient and reliable operation of the power system.

[0006] On the one hand, the present invention provides a coordinated optimization control method for renewable energy and phase regulator for a long-distance weak transmission-end power grid, comprising: Step 1: Obtain power transmission parameter data of the target new energy unit during power transmission; Step 2: By analyzing the relationship between the voltage amplitude of the renewable energy grid connection point and the rated voltage, the voltage drop of the renewable energy grid connection point is determined; Step 3: Combine the power and voltage drop of the phase regulator to determine the short-circuit fault of the power grid and generate a coordinated optimization control strategy; Step 4: Based on the coordinated optimization control strategy and combined with the voltage drop of the grid connection point, a control signal is generated for the new energy unit and controlled; Step 5: Obtain the adjustment results after coordinated optimization control of the target new energy unit, and determine whether the adjustment results meet the optimization expectations.

[0007] On the other hand, the power transmission parameter data of the target new energy unit during power transmission is obtained, including: Clarify the types of power transmission parameters to be monitored during the transmission of renewable energy power, including: grid-related operating parameters, renewable energy grid connection point operating parameters, and phase-shifting parameters; Selecting a corresponding sensor based on the power transmission parameter type, configuring a unique first number for each sensor, and configuring a unique second number for the sensor installation location; According to the corresponding relationship between the first number and the second number, the sensor installation and configuration are completed, and the original power transmission parameter data is obtained in real time.

[0008] On the other hand, it also includes: Obtaining original power transmission parameter data, and determining a data sampling frequency according to any power transmission parameter type, and performing time-unified processing on the data sampling frequencies of all power transmission parameter types to obtain a standard time interval; Based on a standard time interval, time alignment processing is performed on original power transmission parameter data of any power transmission parameter type, and missing values ​​are filled to obtain first power transmission data; According to the unit standard of the standard library, the first power transmission data is unit-standardized to obtain standard power transmission data.

[0009] On the other hand, by analyzing the relationship between the voltage amplitude and the rated voltage of the new energy grid connection point, the voltage drop of the new energy grid connection point is judged, including: According to the standard power transmission data, the standard voltage amplitude of the new energy grid connection point is obtained, and the rated voltage amplitude of the new energy grid connection point is obtained, and the voltage drop of the new energy grid connection point is obtained as follows: ;in, Indicates the voltage drop. ( ) indicates satisfaction The drop function under the condition, Indicates the standard voltage amplitude of the new energy grid connection point, Indicates the rated voltage amplitude of the new energy grid connection point, It represents the voltage amplitude conversion coefficient; According to the power system standard, if the voltage drop is greater than the preset standard threshold, it is determined that the voltage drop at the renewable energy grid connection point exceeds the standard; otherwise, it is determined that the voltage drop at the renewable energy grid connection point is normal.

[0010] On the other hand, combined with the power and voltage drop of the phase regulator, the short-circuit fault of the power grid is determined and a coordinated optimization control strategy is generated, including: According to the standard power transmission data, the standard active power of the phase regulator and the active power threshold of the phase regulator are obtained. If the standard active power of the phase regulator is greater than the active power threshold and the voltage drop at the renewable energy grid connection point exceeds the standard, it is determined that there is a short circuit fault in the current power grid. The system executes the coordinated optimization control strategy. When the standard active power of the phase regulator is equal to the active power threshold and the voltage drop at the renewable energy grid connection point is normal, it is determined that the current power grid operation status is normal. If the grid is operating normally, the active power output of the new energy grid connection point is output according to the set value, and the reactive power injected into the grid is set to 0.

[0011] On the other hand, based on the coordinated optimization control strategy and combined with the voltage drop situation of the grid connection point, including: Based on the coordinated optimization control strategy, the control quantities of the active power and reactive power of renewable energy are determined as follows: ;in, Indicates the active power control amount, Represents the reactive power control quantity, Indicates the maximum reference value of voltage, Indicates the voltage value of the current grid connection point. Indicates the voltage drop coefficient, Indicates the phase difference between the voltage and current at the grid connection point. Indicates the active power reference value, Indicates reactive power reference value; If the grid voltage amplitude is detected ≤ ≤ When the active power reference value of the new energy grid connection point is set to the preset standard power Pom, the reactive power reference value is ; Where S represents the apparent power of the new energy grid connection point, Indicates the minimum reference value of voltage; If the grid voltage amplitude is detected When the active power reference value of the new energy grid connection point is set to 0, the reactive power reference value is .

[0012] On the other hand, control signals are generated and controlled for the new energy units, including: Based on the results of active power and reactive power regulation, the system generates control signals for the control devices of the corresponding new energy units and sends them to the corresponding devices; According to the actuator of any device, the control signal is executed to generate reference values ​​of the inner loop active current and reactive current, and the control result of the device is obtained based on the reference value adjustment.

[0013] On the other hand, the adjustment results after coordinated optimization control of the target new energy units are obtained, and it is judged whether the adjustment results meet the optimization expectations, including: Obtain the adjustment result returned by the system after the coordinated optimization control of the target new energy unit, and perform error analysis with the reactive power reference value and the active power reference value to obtain the active power error and the reactive power error; The total evaluation error is obtained according to the preset evaluation weight. If the total evaluation error is greater than the preset evaluation threshold, it is determined that the adjustment result does not meet expectations and the reference value of the control algorithm is readjusted. Otherwise, it is determined that the adjustment result meets expectations.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid, which is used to obtain parameter data during power transmission, analyze voltage changes at renewable energy grid connection points and phase-shifting devices power, identify grid short-circuit faults, and generate a coordinated optimization control strategy. The control algorithm adjusts the output of renewable energy units based on voltage drop conditions. Finally, by evaluating the conformity of the adjustment results with the optimization expectations, the stable operation and optimized performance of the system are ensured. This process improves the power grid's ability to regulate renewable energy units, and helps to achieve efficient and reliable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a flow chart of a coordinated optimization control method for a remote weak-transmitting-end power grid using renewable energy and a phase regulator provided by an embodiment of the present invention; Figure 2 It is a flow chart of the coordinated optimization control method; Figure 3 It is the control structure block diagram; Figure 4 It is a block diagram of the fault judgment control structure; Figure 5It is a block diagram of the new energy power dynamic optimization adjustment strategy module; Figure 6 and Figure 7 It is the waveform diagram of the phase regulator implementation case. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: like Figure 1 As shown, the coordinated optimization control method for renewable energy and phase regulator for a long-distance weak-transmitting-end power grid provided by an embodiment of the present invention includes: Step 1: Obtain power transmission parameter data of the target new energy unit during power transmission; Step 2: By analyzing the relationship between the voltage amplitude of the renewable energy grid connection point and the rated voltage, the voltage drop of the renewable energy grid connection point is determined; Step 3: Combine the power and voltage drop of the phase regulator to determine the short-circuit fault of the power grid and generate a coordinated optimization control strategy; Step 4: Based on the coordinated optimization control strategy and combined with the voltage drop of the grid connection point, a control signal is generated for the new energy unit and controlled; Step 5: Obtain the adjustment results after coordinated optimization control of the target new energy unit, and determine whether the adjustment results meet the optimization expectations.

[0019] In this embodiment, the target new energy unit refers to a power generation device that generates electricity through renewable energy (such as wind energy, solar energy, etc.) and is connected to the power grid.

[0020] In this embodiment, power transmission parameter data refers to various parameter data related to power transmission, conversion, regulation and control involved in the power transmission process, including: grid voltage, grid frequency, grid connection point voltage, new energy unit power, phase-shifting phase power, and phase-shifting phase voltage.

[0021] In this embodiment, the power grid is a power system network composed of various power equipment (such as generators, substations, power lines, switchgear, etc.).

[0022] In this embodiment, the new energy grid connection point refers to the interface location where the new energy power generation equipment (such as wind power generation, solar power generation, etc.) is connected to the power grid.

[0023] In this embodiment, the phase regulator is a device used to adjust the voltage and frequency of the power grid in the power system, and its parameters include: reactive power, voltage amplitude, adjustment range, phase angle, etc.

[0024] In this embodiment, the amplitude refers to the maximum value of the voltage or current, which indicates the strength or size of the signal.

[0025] In this embodiment, the rated voltage is a standard voltage value specified during design and operation of the power system, indicating a voltage level that a device or power grid should maintain under normal operating conditions.

[0026] In this embodiment, the voltage drop refers to a phenomenon in which the voltage in the power grid drops instantaneously below the rated voltage.

[0027] In this embodiment, the grid short circuit fault refers to a phenomenon in which an abnormal current is generated due to an abnormality in a device or line, resulting in a current passing through a low impedance path.

[0028] In this embodiment, the coordinated optimization control strategy refers to a strategy for coordinated optimization and adjustment of various links in the power transmission process by real-time acquisition and analysis of operating data of the power grid and the new energy units.

[0029] In this embodiment, the control algorithm refers to analyzing the operating data of the power grid and the new energy units through mathematical models and calculation methods in the power system, generating control signals in real time and adjusting the new energy units to ensure the stability of the power grid and the efficient operation of the new energy units.

[0030] In this embodiment, the control signal refers to an instruction generated by the control algorithm according to the real-time operating status of the power grid and the new energy unit.

[0031] In this embodiment, the optimization expectation refers to the ideal state of grid stability, power output, voltage regulation, etc. that is expected to be achieved after adjusting the operating parameters of the new energy units through the coordinated optimization control strategy.

[0032] In this embodiment, the process of the coordinated optimization control method is as follows: Figure 2 shown.

[0033] In this embodiment, the overall control structure block diagram of the present invention is as follows: Figure 3 shown.

[0034] In this embodiment, the waveform after the phase regulator is adjusted is as follows: Figure 6 and Figure 7 shown.

[0035] In this embodiment, the fault judgment control structure block diagram of the present invention is as follows: Figure 4 shown.

[0036] The working principle and beneficial effects of the above technical solution are: through real-time monitoring of power transmission parameters, analysis of voltage drops and phase-shifting power, identification of power grid short-circuit faults, generation of optimized control strategies, adjustment of the output of new energy units, ensuring stable and efficient operation of the power system, and improving the power grid's ability to regulate new energy units.

[0037] Embodiment 2: On the basis of the above-mentioned embodiment 1, the power transmission parameter data of the target new energy generator set during the power transmission process is obtained, including: Clarify the types of power transmission parameters to be monitored during the transmission of renewable energy power, including: grid-related operating parameters, renewable energy grid connection point operating parameters, and phase-shifting parameters; Selecting a corresponding sensor based on the power transmission parameter type, configuring a unique first number for each sensor, and configuring a unique second number for the sensor installation location; According to the corresponding relationship between the first number and the second number, the sensor installation and configuration are completed, and the original power transmission parameter data is obtained in real time.

[0038] In this embodiment, the power transmission parameter types include: grid-related operating parameters, new energy grid connection point operating parameters, and phase-shifting phase parameters.

[0039] In this embodiment, the sensor is a key device used to monitor and collect various operating parameters of the power system in real time.

[0040] In this embodiment, the first number refers to a unique identifier of the sensor type.

[0041] In this embodiment, the second number refers to a unique identifier of the sensor location.

[0042] In this embodiment, the original power transmission parameter data refers to basic physical quantity data collected in real time from different types of sensors and reflecting various operating states of the power system, including: voltage, current, power, frequency, etc.

[0043] The working principle and beneficial effects of the above technical solution are: by clarifying the type of power transmission parameters and selecting the corresponding sensors, a unique number is assigned to each sensor to ensure the accuracy and real-time performance of sensor installation and data collection, which helps to accurately monitor the new energy power transmission process and improve the stability and efficiency of power grid operation.

[0044] Embodiment 3: Based on the above embodiment 2, it also includes: Obtaining original power transmission parameter data, and determining a data sampling frequency according to any power transmission parameter type, and performing time-unified processing on the data sampling frequencies of all power transmission parameter types to obtain a standard time interval; Based on a standard time interval, time alignment processing is performed on original power transmission parameter data of any power transmission parameter type, and missing values ​​are filled to obtain first power transmission data; According to the unit standard of the standard library, the first power transmission data is unit-standardized to obtain standard power transmission data.

[0045] In this embodiment, the data sampling frequency refers to the number of times data is acquired or recorded from the power transmission system within a unit time.

[0046] In this embodiment, time unification processing refers to aligning different sources and different sampling frequencies to the same time reference interval.

[0047] In this embodiment, the standard time interval refers to a unified time interval obtained by unified time processing.

[0048] In this embodiment, the time alignment process refers to the process of aligning data with different sampling frequencies according to a unified time standard.

[0049] In this embodiment, missing values ​​refer to the situation where some data points in the data set are missing or have no records.

[0050] In this embodiment, the first power transmission data refers to the power transmission parameter data after being processed by the following steps.

[0051] In this embodiment, the standard library refers to a predefined, standardized set of units and standards.

[0052] In this embodiment, the unit standard refers to a set of unified unit specifications and standards for describing power transmission parameters.

[0053] In this embodiment, unit standardization is the process of converting all power transmission parameter data in different units into a unified and standardized unit system during data processing.

[0054] The working principle and beneficial effects of the above technical solution are: by unifying the sampling frequency and time alignment processing, the synchronization of various power transmission parameter data is ensured, and missing values ​​are filled, and then the data is converted through unit standardization to improve the consistency and comparability of the data, which helps to improve the accuracy and reliability of data analysis and control decisions.

[0055] Embodiment 4: On the basis of the above-mentioned embodiment 1, by analyzing the relationship between the amplitude of the voltage at the renewable energy grid connection point and the rated voltage, the voltage drop condition of the renewable energy grid connection point is judged, including: According to the standard power transmission data, the standard voltage amplitude of the new energy grid connection point is obtained, and the rated voltage amplitude of the new energy grid connection point is obtained, and the voltage drop of the new energy grid connection point is obtained as follows: ;in, Indicates the voltage drop. ( ) indicates satisfaction The drop function under the condition, Indicates the standard voltage amplitude of the new energy grid connection point, Indicates the rated voltage amplitude of the new energy grid connection point, It represents the voltage amplitude conversion coefficient; According to the power system standard, if the voltage drop is greater than the preset standard threshold, it is determined that the voltage drop at the renewable energy grid connection point exceeds the standard; otherwise, it is determined that the voltage drop at the renewable energy grid connection point is normal.

[0056] In this embodiment, the voltage drop refers to the voltage drop relative to the rated voltage in the power system due to power load changes, failures, equipment input or withdrawal, etc.

[0057] In this embodiment, the droop function is a mathematical formula that describes voltage variation and quantifies the degree of voltage variation from a rated voltage to a standard voltage.

[0058] In this embodiment, the power system standard is formulated by power management agencies of various countries or international standard organizations such as IEC, IEEE, etc., and defines technical requirements and regulations on power grid operation, quality, stability, equipment protection, etc.

[0059] In this embodiment, the preset standard threshold refers to a maximum allowable value set when evaluating the voltage drop at the renewable energy grid connection point.

[0060] In this embodiment, the standard power transmission data refers to standardized data describing the operation of the power grid and the performance of equipment in the power system.

[0061] The working principle and beneficial effects of the above technical solution are: by calculating the voltage drop at the renewable energy grid connection point and comparing it with the preset standard threshold, real-time monitoring and judgment of the voltage drop can be achieved, ensuring that the voltage fluctuation is controlled within the standard range, thereby improving the stability of the power grid and the safety of renewable energy grid connection.

[0062] Embodiment 5: On the basis of the above-mentioned embodiment 4, combined with the power and voltage drop of the phase regulator, the short circuit fault of the power grid is determined and a coordinated optimization control strategy is generated, including: According to the standard power transmission data, the standard active power of the phase regulator and the active power threshold of the phase regulator are obtained. If the standard active power of the phase regulator is greater than the active power threshold and the voltage drop at the renewable energy grid connection point exceeds the standard, it is determined that there is a short circuit fault in the current power grid. The system executes the coordinated optimization control strategy. When the standard active power of the phase regulator is equal to the active power threshold and the voltage drop at the renewable energy grid connection point is normal, it is determined that the current power grid operation status is normal. If the grid is operating normally, the active power output of the new energy grid connection point is output according to the set value, and the reactive power injected into the grid is set to 0.

[0063] In this embodiment, the standard active power rate refers to the active power of the power equipment after standardization.

[0064] In this embodiment, the active power threshold refers to the limit of the maximum active power output that the device can withstand.

[0065] In this embodiment, the block diagram of the new energy power dynamic optimization adjustment strategy module is as follows: Figure 5 shown.

[0066] The working principle and beneficial effects of the above technical solution are: by combining the active power of the phase-converter and the voltage drop of the renewable energy grid connection point, the grid operation status is determined in real time to ensure timely identification and optimized control of grid faults. When the grid is normal, the renewable energy output active power is controlled and the reactive power is kept at zero, thus improving the stability and efficiency of the grid.

[0067] Embodiment 6: On the basis of the above-mentioned embodiment 1, based on the coordinated optimization control strategy and combined with the voltage drop of the grid connection point, it includes: Based on the coordinated optimization control strategy, the control quantities of the active power and reactive power of renewable energy are determined as follows: ;in, Indicates the active power control amount, Represents the reactive power control quantity, Indicates the maximum reference value of voltage, Indicates the voltage value of the current grid connection point. Indicates the voltage drop coefficient, Indicates the phase difference between the voltage and current at the grid connection point. Indicates the active power reference value, Indicates reactive power reference value; If the grid voltage amplitude is detected ≤ ≤ When the active power reference value of the new energy grid connection point is set to the preset standard power Pom, the reactive power reference value is ; Where S represents the apparent power of the new energy grid connection point, Indicates the minimum reference value of voltage; If the grid voltage amplitude is detected When the active power reference value of the new energy grid connection point is set to 0, the reactive power reference value is .

[0068] In this embodiment, the control amount refers to the quantified degree of operation of the new energy unit generated by the control algorithm.

[0069] In this embodiment, the preset standard power refers to setting an active power reference value of the new energy grid connection point under normal grid voltage conditions.

[0070] In this embodiment, the apparent power is composed of active power and reactive power, and reflects the load capacity of the power grid.

[0071] The working principle and beneficial effects of the above technical solution are: based on the voltage drop situation and control algorithm, the power control signal of the new energy unit is generated, and the active and reactive power output is adjusted in real time. It ensures that when the grid voltage changes, the power output of the new energy grid connection point is optimized, and the grid stability and power quality are improved.

[0072] Embodiment 7: On the basis of the above-mentioned embodiment 6, a control signal is generated and controlled for the new energy generator set, including: Based on the results of active power and reactive power regulation, the system generates control signals for the control devices of the corresponding new energy units and sends them to the corresponding devices; According to the actuator of any device, the control signal is executed to generate reference values ​​of the inner loop active current and reactive current, and the control result of the device is obtained based on the reference value adjustment.

[0073] In this embodiment, the control signal refers to a signal generated from a scheduling or optimization algorithm of the system, which is used to adjust the actuator of the unit equipment.

[0074] In this embodiment, the actuator refers to a hardware device that can adjust the output or behavior of the device according to the control signal. The main function is to convert the control signal of the system into physical action, thereby controlling the operating state of the device.

[0075] In this embodiment, the inner loop active current refers to a current reference value used to adjust the active power, and is output through the current control device as part of the control loop.

[0076] The working principle and beneficial effects of the above technical solution are: generating control signals based on active and reactive power regulation control quantities, adjusting the actuators of new energy units, optimizing the inner loop current reference value, and achieving precise control. Effectively improving the system response speed and regulation accuracy, and enhancing the stability of the power grid and power output efficiency.

[0077] Embodiment 8: On the basis of the above-mentioned embodiment 1, the adjustment result after the coordinated optimization control of the target new energy unit is obtained, and it is judged whether the adjustment result meets the optimization expectation, including: Obtain the adjustment result returned by the system after the coordinated optimization control of the target new energy unit, and perform error analysis with the reactive power reference value and the active power reference value to obtain the active power error and the reactive power error; The total evaluation error is obtained according to the preset evaluation weight. If the total evaluation error is greater than the preset evaluation threshold, it is determined that the adjustment result does not meet expectations and the reference value of the control algorithm is readjusted. Otherwise, it is determined that the adjustment result meets expectations.

[0078] In this embodiment, error analysis is the process of evaluating and studying the difference between the system output and the expected output.

[0079] In this embodiment, the active power error refers to the deviation between the actual active power output returned by the system after the coordinated optimization control of the target new energy unit and the preset active power reference value.

[0080] In this embodiment, the reactive power error refers to the deviation between the actual reactive power output returned by the system after the coordinated optimization control of the target new energy unit and the preset reactive power reference value.

[0081] In this embodiment, the preset evaluation weight refers to the weight coefficients respectively assigned to the active error and the reactive error in the error analysis according to the requirements and objectives of the system.

[0082] In this embodiment, the total evaluation error is a comprehensive error metric that combines active power error and reactive power error. These two errors are weighted according to preset weights to determine whether the adjustment result of the entire system meets the expected goal.

[0083] In this embodiment, the preset evaluation threshold refers to a fixed value used to determine whether the adjustment result meets expectations during the system optimization and error analysis process.

[0084] The working principle and beneficial effect of the above technical solution are: by analyzing the error between the adjustment result and the reference value of the target new energy unit, the control effect is evaluated. If the total evaluation error exceeds the threshold, the control algorithm is adjusted to optimize the performance. The accuracy and stability of the system adjustment are improved to ensure that the unit operation effect meets expectations.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coordinated optimization control method for renewable energy and phase-shifting power supply in a long-distance weak transmission-end power grid, characterized in that: include: Step 1: Obtain power transmission parameter data of the target new energy unit during power transmission; Step 2: By analyzing the relationship between the voltage amplitude of the renewable energy grid connection point and the rated voltage, the voltage drop of the renewable energy grid connection point is determined; Step 3: Combine the power and voltage drop of the phase regulator to determine the short-circuit fault of the power grid and generate a coordinated optimization control strategy; Step 4: Based on the coordinated optimization control strategy and combined with the voltage drop of the grid connection point, a control signal is generated for the new energy unit and controlled; Step 5: Obtain the adjustment results after coordinated optimization control of the target new energy unit, and determine whether the adjustment results meet the optimization expectations.

2. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 1 is characterized in that: Obtain the power transmission parameter data of the target new energy unit during power transmission, including: Clarify the types of power transmission parameters to be monitored during the transmission of renewable energy power, including: grid-related operating parameters, renewable energy grid connection point operating parameters, and phase-shifting parameters; Selecting a corresponding sensor based on the power transmission parameter type, configuring a unique first number for each sensor, and configuring a unique second number for the sensor installation location; According to the corresponding relationship between the first number and the second number, the sensor installation and configuration are completed, and the original power transmission parameter data is obtained in real time.

3. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 2 is characterized in that: Also includes: Obtaining original power transmission parameter data, and determining a data sampling frequency according to any power transmission parameter type, and performing time-unified processing on the data sampling frequencies of all power transmission parameter types to obtain a standard time interval; Based on a standard time interval, time alignment processing is performed on original power transmission parameter data of any power transmission parameter type, and missing values ​​are filled to obtain first power transmission data; According to the unit standard of the standard library, the first power transmission data is unit-standardized to obtain standard power transmission data.

4. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 1 is characterized in that: By analyzing the relationship between the voltage amplitude and the rated voltage of the new energy grid connection point, the voltage drop of the new energy grid connection point is judged, including: According to the standard power transmission data, the standard voltage amplitude of the new energy grid connection point is obtained, and the rated voltage amplitude of the new energy grid connection point is obtained, and the voltage drop of the new energy grid connection point is obtained as follows: ;in, Indicates the voltage drop. ( ) indicates satisfaction The drop function under the condition, Indicates the standard voltage amplitude of the new energy grid connection point, Indicates the rated voltage amplitude of the new energy grid connection point, It represents the voltage amplitude conversion coefficient; According to the power system standard, if the voltage drop is greater than the preset standard threshold, it is determined that the voltage drop at the renewable energy grid connection point exceeds the standard; otherwise, it is determined that the voltage drop at the renewable energy grid connection point is normal.

5. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 4 is characterized in that: Combined with the power and voltage drop of the phase regulator, the short circuit fault of the power grid is determined and a coordinated optimization control strategy is generated, including: According to the standard power transmission data, the standard active power of the phase regulator and the active power threshold of the phase regulator are obtained. If the standard active power of the phase regulator is greater than the active power threshold and the voltage drop at the renewable energy grid connection point exceeds the standard, it is determined that there is a short circuit fault in the current power grid. The system executes the coordinated optimization control strategy. When the standard active power of the phase regulator is equal to the active power threshold and the voltage drop at the renewable energy grid connection point is normal, it is determined that the current power grid operation status is normal. If the grid is operating normally, the active power output of the new energy grid connection point is output according to the set value, and the reactive power injected into the grid is set to 0.

6. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 1 is characterized in that: Based on the coordinated optimization control strategy and combined with the voltage drop situation of the grid connection point, including: Based on the coordinated optimization control strategy, the control quantities of the active power and reactive power of renewable energy are determined as follows: ;in, Indicates the active power control amount, Represents the reactive power control quantity, Indicates the maximum reference value of voltage, Indicates the voltage value of the current grid-connected point. Indicates the voltage drop coefficient, Indicates the phase difference between the voltage and current at the grid connection point. Indicates the active power reference value, Indicates reactive power reference value; If the grid voltage amplitude is detected ≤ ≤ When the active power reference value of the new energy grid connection point is set to the preset standard power Pom, the reactive power reference value is ; Where S represents the apparent power of the new energy grid connection point, Indicates the minimum reference value of voltage; If the grid voltage amplitude is detected When the active power reference value of the new energy grid connection point is set to 0, the reactive power reference value is .

7. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 6 is characterized in that: Generate control signals and control the new energy units, including: Based on the results of active power and reactive power regulation, the system generates control signals for the control devices of the corresponding new energy units and sends them to the corresponding devices; According to the actuator of any device, the control signal is executed to generate reference values ​​of the inner loop active current and reactive current, and the control result of the device is obtained based on the reference value adjustment.

8. The coordinated optimization control method for renewable energy and phase-shifting devices for a long-distance weak-transmitting-end power grid according to claim 1 is characterized in that: Obtain the adjustment results after coordinated optimization control of the target new energy unit, and determine whether the adjustment results meet the optimization expectations, including: Obtain the adjustment result returned by the system after the coordinated optimization control of the target new energy unit, and perform error analysis with the reactive power reference value and the active power reference value to obtain the active power error and the reactive power error; The total evaluation error is obtained according to the preset evaluation weight. If the total evaluation error is greater than the preset evaluation threshold, it is determined that the adjustment result does not meet expectations and the reference value of the control algorithm is readjusted. Otherwise, it is determined that the adjustment result meets expectations.

Images