CN118157136B - Marine power generation harmonic wave treatment method and system based on harmonic wave compensation and impedance adjustment - Google Patents
Marine power generation harmonic wave treatment method and system based on harmonic wave compensation and impedance adjustment Download PDFInfo
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Abstract
The invention discloses a method and a system for managing the harmonic wave of offshore power generation based on harmonic compensation and impedance adjustment, which relate to the technical field of harmonic wave management and comprise the steps of configuring a sensor to capture key operation parameters of a power grid in real time; setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system; the efficiency of the compensation equipment is quantified by combining the harmonic compensation requirement and the system impedance adjustment requirement; setting a minimized power quality loss model, and adjusting system parameters to realize harmonic treatment. The offshore power generation harmonic governance method based on harmonic compensation and impedance adjustment provided by the invention reduces governance cost by evaluating whether harmonic governance is required to be started or shut down. The operation of the compensation equipment is optimized, the use efficiency of the compensation equipment is improved, the energy consumption is reduced, and the optimal configuration of resources is realized.
Description
Technical Field
The invention relates to the technical field of harmonic wave management, in particular to a method and a system for managing marine power generation harmonic waves based on harmonic wave compensation and impedance adjustment.
Background
Offshore wind power is used as a high-efficiency renewable energy source, and development and utilization of the offshore wind power have become one of important directions for global energy structure transformation. Compared with onshore wind power, the offshore wind farm can utilize more stable and strong sea wind, and theoretically has higher power generation efficiency and greater development potential. However, the technical and environmental challenges of offshore wind power are also relatively more complex.
First, offshore wind farms are often located in areas farther from shore, which not only increases the power transmission distance, but also increases the technical requirements of grid connection and energy transfer. Long-range transmission can lead to large power losses and spread of harmonic problems, which pose challenges to the stability and power quality of the grid. To alleviate these problems, more technology and capital is typically invested to optimize the power transmission system and increase its efficiency.
Second, the harsh conditions of the offshore environment place extremely high demands on the equipment. Salt spray, humidity and seawater corrosiveness of sea wind can affect the stability and life of power electronics. Furthermore, the costs and difficulty of maintenance and repair work on the sea are far higher than on land, which requires that offshore wind power systems must be provided with higher reliability and longer fault-free operation times.
The harmonic problem is particularly pronounced in offshore wind power systems. Due to the widespread use of power electronic conversion devices (such as inverters), offshore wind farms inevitably generate harmonics during the power conversion process, which not only affect the stability and power quality of the power grid, but may also cause interference to other users connected to the power grid. In addition, conventional harmonic management methods, such as passive filter installation, while capable of reducing harmonic effects to some extent, are limited in their effectiveness by the harmonic source and by changes in system conditions. In the specific application scene of offshore wind power, the fixed filtering scheme is difficult to adapt to complex and changeable offshore environment and system running states, so that the harmonic treatment effect is not ideal.
Disclosure of Invention
The present invention has been made in view of the above-described problems.
Therefore, the technical problems solved by the invention are as follows: the existing offshore wind power harmonic wave treatment method has the problems that harmonic wave diffusion is generated due to the fact that the distance is greatly influenced, the offshore wind power environment is bad, manual adjustment is difficult, and the system can be automatically operated to solve the harmonic wave due to the fact that the existing offshore wind power harmonic wave treatment method is suitable for changeable environments.
In order to solve the technical problems, the invention provides the following technical scheme: a method for harnessing the harmonic wave of offshore power generation based on harmonic compensation and impedance adjustment comprises the steps of configuring a sensor to capture key operation parameters of a power grid in real time; setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system; the efficiency of the compensation equipment is quantified by combining the harmonic compensation requirement and the system impedance adjustment requirement; setting a minimized power quality loss model, and adjusting system parameters to realize harmonic treatment.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the configuration sensor captures key operation parameters of the power grid in real time, wherein the key operation parameters of the power grid comprise voltage, current and phase difference, each inverter is divided into a unit, a power grid key operation parameter change identification model is constructed, and the data change rate of each inverter unit is detected and expressed as follows:
；
Wherein, Indicating time of dayIs a system integrated state vector,Indicating time of dayIs used for the voltage change rate of the (c) voltage,Indicating the time after considering the influence of the line temperatureIs used for the current value of (a),Indicating time of dayIs used for the phase difference change of (a),The voltage value at the time t is indicated,Indicating time of dayIs not considered to be the original current measurement of the temperature effect,Indicating the temperature coefficient of influence of the current,Indicating time of dayIs used for the temperature control of the cable,The reference temperature is indicated as such,Indicating time of dayIs used for the voltage phase of the (c) signal,As a value of the reference phase to be used,A g-th inverter of an offshore wind power system is shown.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the method for setting the harmonic generation factor and harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system comprises the steps of introducing the harmonic generation factor HGF and the harmonic sensitivity index HSI, respectively quantifying the contribution of the inverter to the harmonic generation and the sensitivity of the power grid to the harmonic, acquiring the order and the amplitude of the harmonic according to the historical data, and determining the harmonic generation coefficient of the inverterThe harmonic generation factor HGF of the power generation system is determined, expressed as:
；
Wherein, Represent the firstHarmonic generation coefficients of the inverters; a harmonic sensitivity index HSI is determined based on the voltage and current, expressed as:
；
Wherein, AndRespectively represent the firstThe individual harmonics are at the momentIs used for the voltage and current amplitudes of (a),Representing the highest harmonic order.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the method for evaluating the influence of the harmonic on the system by setting the harmonic generation factor and the harmonic sensitivity index based on the monitoring data further comprises the steps of constructing a comprehensive influence evaluation model for voltage and current harmonic distortion, scoring the harmonic influence of the whole power generation system, and expressing the score as follows:
Wherein, AndThe voltage harmonic distortion and the current harmonic distortion at time t are respectively represented,Representing the amplitude of the fundamental current,Representing the fundamental voltage amplitude; when (when)When the current harmonic influence is lower than the preset standard, the current harmonic influence is considered to be in the allowable range, the harmonic treatment is not carried out, whenWhen the preset standard is exceeded, a device efficiency compensation strategy is triggered.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the method comprises the steps that after the efficiency of the quantitative compensation equipment combining the harmonic compensation requirement and the system impedance adjustment requirement comprises triggering an equipment efficiency compensation strategy, the system sends a compensation signal, data acquisition is carried out once after a sensor receives the compensation signal, compensation current corresponding to each harmonic component is calculated and provided according to the acquired data, and the compensation current is expressed as:
；
Wherein, Representing the harmonic currents of the current in the wave,Indicating that the compensation gain is to be applied,Is at the momentIs used for controlling the total current of the system,Is the firstThe voltage values of the individual harmonic components,Is the sum of the voltages of the fundamental and all harmonic components,Is directed to the firstThe compensation coefficient of the frequency of the individual harmonics,Represent the firstThe tolerance threshold for individual harmonic currents is the maximum harmonic current level that the system can accept.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the method for quantifying the efficiency of the compensation device by combining the harmonic compensation requirement and the system impedance adjustment requirement further comprises calculating an impedance adjustment value, adjusting the original impedance of the system, and representing:
；
Wherein, Representing the impedance adjustment coefficient.
As a preferable scheme of the offshore power generation harmonic treatment method based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the step of setting the minimized power quality loss model comprises the steps of constructing the minimized power quality loss model, determining the parameter adjustment direction according to the gradient of a loss function relative to each adjustable parameter, calculating the gradient through a numerical method, updating the system parameters according to the calculated gradient, and the minimized power quality loss model is expressed as:
；
Wherein, A preference factor representing the system impedance adjustment.
Another object of the present invention is to provide a harmonic governance system for offshore wind power generation based on harmonic compensation and impedance adjustment, which can start or close harmonic governance by evaluating whether harmonic governance is required, and solve the problem of cost increase caused by low automation degree of current offshore wind power harmonic governance, and harmonic governance or non-harmonic governance in the whole process of power generation and power transmission.
As a preferable scheme of the offshore power generation harmonic treatment system based on harmonic compensation and impedance adjustment, the invention comprises the following steps: the system comprises a data acquisition module, a harmonic evaluation module, a compensation module and a parameter adjustment module; the data acquisition module is used for configuring the sensor to capture key operation parameters of the power grid in real time; the harmonic evaluation module is used for setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system; the compensation module is used for quantifying the efficiency of the compensation equipment by combining the harmonic compensation requirement and the system impedance adjustment requirement; the parameter adjusting module sets a model for minimizing the power quality loss, and adjusts system parameters to realize harmonic treatment.
A computer device comprising a memory storing a computer program and a processor executing the computer program is the step of implementing a harmonic remediation method for offshore power generation based on harmonic compensation and impedance adjustment.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of a harmonic remediation method for offshore power generation based on harmonic compensation and impedance adjustment.
The invention has the beneficial effects that: the offshore power generation harmonic governance method based on harmonic compensation and impedance adjustment provided by the invention reduces governance cost by evaluating whether harmonic governance is required to be started or shut down. The operation of the compensation equipment is optimized, the use efficiency of the compensation equipment is improved, the energy consumption is reduced, and the optimal configuration of resources is realized. And by setting a model for minimizing the electric energy quality loss, the electric energy loss is reduced to the greatest extent while the harmonic wave is controlled by adjusting the parameters of the wind power system. The invention has better effect in reducing cost and electric energy loss.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall flowchart of a method for managing harmonic waves of offshore power generation based on harmonic compensation and impedance adjustment according to a first embodiment of the present invention.
Fig. 2 is an overall flowchart of an offshore power generation harmonic remediation system based on harmonic compensation and impedance adjustment according to a third embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Referring to fig. 1, for one embodiment of the present invention, there is provided a method for managing harmonic waves of offshore power generation based on harmonic compensation and impedance adjustment, including:
s1: the sensor is configured to capture key operating parameters of the power grid in real time.
Further, configuring the sensor to capture the key operation parameters of the power grid in real time includes that the key operation parameters of the power grid include voltage, current and phase difference, dividing each inverter into a unit, constructing a key operation parameter change identification model of the power grid, and detecting the data change rate of each inverter unit, wherein the data change rate is expressed as follows:
；
Wherein, Indicating time of dayIs a system integrated state vector,Indicating time of dayIs used for the voltage change rate of the (c) voltage,Indicating the time after considering the influence of the line temperatureIs used for the current value of (a),Indicating time of dayIs used for the phase difference change of (a),The voltage value at the time t is indicated,Indicating time of dayIs not considered to be the original current measurement of the temperature effect,Indicating the temperature coefficient of influence of the current,Indicating time of dayIs used for the temperature control of the cable,The reference temperature is indicated as such,Indicating time of dayIs used for the voltage phase of the (c) signal,As a value of the reference phase to be used,A g-th inverter of an offshore wind power system is shown.
S2: the harmonic generation factor and harmonic sensitivity index are set based on the monitoring data to evaluate the effect of the harmonic on the system.
Further, setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system comprises introducing the harmonic generation factor HGF and the harmonic sensitivity index HSI, respectively quantifying the contribution of the inverter to the harmonic generation and the sensitivity of the power grid to the harmonic, acquiring the order and the amplitude of the harmonic according to the historical data, and determining the harmonic generation coefficient of the inverterThe harmonic generation factor HGF of the power generation system is determined, expressed as:
；
Wherein, Represent the firstHarmonic generation coefficients of the inverters.
A harmonic sensitivity index HSI is determined based on the voltage and current, expressed as:
；
Wherein, AndRespectively represent the firstThe individual harmonics are at the momentIs used for the voltage and current amplitudes of (a),Representing the highest harmonic order.
It should be noted that, setting the harmonic generation factor and harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system further includes constructing a comprehensive influence evaluation model for voltage and current harmonic distortion, and scoring the harmonic influence of the whole power generation system is expressed as:
；
Wherein, AndThe voltage harmonic distortion and the current harmonic distortion at time t are respectively represented,Representing the amplitude of the fundamental current,Representing the fundamental voltage amplitude.
When (when)When the current harmonic influence is lower than the preset standard, the current harmonic influence is considered to be in the allowable range, the harmonic treatment is not carried out, whenWhen the preset standard is exceeded, a device efficiency compensation strategy is triggered.
It should also be noted that the system is allowed to dynamically adjust the abatement strategy based on the actual degree of harmonic impact. The dynamic evaluation and response mechanism can ensure that the system takes measures in time when the harmonic influence exceeds a preset standard, so that the power quality and stability of the system are optimized. By the method, the wind turbine generator system can operate efficiently, and meanwhile adverse effects of harmonic waves on a power grid and equipment are reduced to the greatest extent.
S3: the efficiency of the compensation device is quantified by combining the harmonic compensation requirement and the system impedance adjustment requirement.
Further, the method includes the steps that after the efficiency of the compensating device is quantified by combining the harmonic compensation requirement and the system impedance adjustment requirement, the system sends a compensation signal after triggering a device efficiency compensation strategy, data acquisition is performed once after the sensor receives the compensation signal, and compensation current corresponding to each harmonic component is calculated and provided according to the acquired data, wherein the compensation current is expressed as:
；
Wherein, Representing the harmonic currents of the current in the wave,Indicating that the compensation gain is to be applied,Is at the momentIs used for controlling the total current of the system,Is the firstThe voltage values of the individual harmonic components,Is the sum of the voltages of the fundamental and all harmonic components,Is directed to the firstThe compensation coefficient of the frequency of the individual harmonics,Represent the firstThe tolerance threshold for individual harmonic currents is the maximum harmonic current level that the system can accept.
It should be noted that, quantifying the efficiency of the compensation device by combining the harmonic compensation requirement and the system impedance adjustment requirement further includes calculating an impedance adjustment value, and adjusting the original impedance of the system, which is expressed as:
；
Wherein, Representing the impedance adjustment coefficient.
It should also be noted that this step achieves a precise implementation of the harmonic remediation measures by triggering the device efficiency compensation strategy and calculating the compensation current that is provided for each harmonic component after the harmonic impact is identified as exceeding the preset criteria. The method not only considers the requirement of harmonic compensation, but also considers the adjustment requirement of system impedance, so that the compensation measures are more comprehensive and effective.
By accurately calculating the compensation current and adjusting the system impedance according to actual needs, the method realizes effective treatment of harmonic waves and remarkable improvement of electric energy quality. The setting of the quantitative compensation strategy ensures the accuracy and the effectiveness of the compensation measures, avoids excessive or insufficient compensation, and improves the efficiency and the reliability of the whole power generation system. Through the strategy, the working state of the compensation equipment can be dynamically adjusted according to actual conditions, and the power grid can maintain excellent electric energy quality under the conditions of changeable and severe sea.
S4: setting a minimized power quality loss model, and adjusting system parameters to realize harmonic treatment.
Further, setting the minimized power quality loss model includes constructing the minimized power quality loss model, determining a parameter adjustment direction according to a gradient of a loss function relative to each adjustable parameter, calculating the gradient by a numerical method, updating a system parameter according to the calculated gradient, and the minimized power quality loss model is expressed as:
；
Wherein, A preference factor representing the system impedance adjustment.
Example 2
In order to verify the beneficial effects of the invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.
First, the preparation and execution of experiments involves configuring sensors to capture key operating parameters of a wind farm grid, including voltage, current, and phase differences, in real time. These parameters are continuously monitored to detect the rate of change as a proxy indicator identifying changes in the harmonic distortion level. A dual strategy of harmonic compensation and impedance adjustment is deployed.
Experiments were designed by comparing the performance of the system during 20 days of operation before and after carrying out the method of the invention. Performance metrics include Total Harmonic Distortion (THD) values of voltage and current, and Power Quality Index (PQI) calculated after implementation. PQI is an innovative index introduced in this experiment, aimed at providing a comprehensive assessment of power quality by considering voltage and current distortion levels.
Table 1 table of experimental data
The THD values of the voltage and current fluctuate on average between 5% and 15% before the method according to the invention is carried out. After implementation, these values are significantly reduced, with an average reduction of 20% to 40%, indicating that the harmonic compensation and impedance adjustment methods effectively reduce the harmonic level of the system. This result verifies the effectiveness of the method of setting the harmonic generation factor and harmonic sensitivity index based on the monitoring data to evaluate the effect of the harmonic on the system.
By converting the improvement in voltage and current THD values into an improvement in PQI, we observe a significant improvement in power quality after implementation of the inventive method. The improvement of PQI shows that the operation efficiency and stability of the whole power grid are improved, which is important for ensuring the safety of the power grid and prolonging the service life of equipment.
Through dynamic evaluation and adjustment strategies, harmonic waves in the power grid are reduced pertinently, and therefore the electric energy quality is improved effectively. This is reflected in a significant decrease in THD value and an increase in PQI. By minimizing the application of the power quality loss model, optimal tuning of the system impedance is also considered. The comprehensive optimization method further improves the operation efficiency and stability of the system, and reflects the technical innovation and superiority of the invention.
Example 3
Referring to fig. 2, for one embodiment of the present invention, there is provided an offshore power generation harmonic treatment system based on harmonic compensation and impedance adjustment, which includes a data acquisition module, a harmonic evaluation module, a compensation module, and a parameter adjustment module.
The data acquisition module is used for configuring the sensor to capture key operation parameters of the power grid in real time. The harmonic evaluation module is used for setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system. The compensation module is used for quantifying the efficiency of the compensation device by combining the harmonic compensation requirement and the system impedance adjustment requirement. The parameter adjusting module sets a model for minimizing the power quality loss, and adjusts system parameters to realize harmonic treatment.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, randomAccess Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like. It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (7)
1. The marine power generation harmonic treatment method based on harmonic compensation and impedance adjustment is characterized by comprising the following steps of:
Configuring a sensor to capture key operation parameters of a power grid in real time;
setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system;
the efficiency of the compensation equipment is quantified by combining the harmonic compensation requirement and the system impedance adjustment requirement;
setting a minimized power quality loss model, and adjusting system parameters to realize harmonic treatment;
The method comprises the steps that after the efficiency of the quantitative compensation equipment combining the harmonic compensation requirement and the system impedance adjustment requirement comprises triggering an equipment efficiency compensation strategy, the system sends a compensation signal, data acquisition is carried out once after a sensor receives the compensation signal, compensation current corresponding to each harmonic component is calculated and provided according to the acquired data, and the compensation current is expressed as:
Wherein I harmonic,n (t) represents a harmonic current, G comp,n (t) represents a compensation gain, I total (t) is a total system current at time t, V n (t) is a voltage value of an nth harmonic component, V total (t) is a voltage total value of a fundamental wave and all harmonic components, k n is a compensation coefficient for the nth harmonic frequency, I threshold,n represents a maximum harmonic current level acceptable to the system, and N represents a highest harmonic number;
the method for quantifying the efficiency of the compensation device by combining the harmonic compensation requirement and the system impedance adjustment requirement further comprises calculating an impedance adjustment value, adjusting the original impedance of the system, and representing:
wherein k represents an impedance adjustment coefficient;
The step of setting the minimized power quality loss model comprises the steps of constructing the minimized power quality loss model, determining the parameter adjustment direction according to the gradient of a loss function relative to each adjustable parameter, calculating the gradient through a numerical method, updating the system parameters according to the calculated gradient, and the minimized power quality loss model is expressed as:
Where λ represents the coefficient of preference for system impedance adjustment and Q system (t) represents the harmonic impact score of the overall power generation system.
2. The method for harnessing the harmonic wave of power generation at sea based on harmonic compensation and impedance adjustment as claimed in claim 1, wherein: the configuration sensor captures key operation parameters of the power grid in real time, wherein the key operation parameters of the power grid comprise voltage, current and phase difference, each inverter is divided into a unit, a power grid key operation parameter change identification model is constructed, and the data change rate of each inverter unit is detected and expressed as follows:
Pg(t)＝{Vrate(t),IT(t),ΔΦ(t)}
IT(t)＝I(t)·(1+α·(Tcable(t)-Tref))
ΔΦ(t)＝Φ(t)-Φref
Wherein, P g (T) represents an inverter conversion system integrated state vector of time T, V rate (T) represents a voltage change rate of time T, I T (T) represents a current value of time T after considering a line temperature effect, ΔΦ (T) represents a phase difference change of time T, V (T) represents a voltage value of time T, I (T) represents an original current measurement value of time T without considering a temperature effect, α represents a current temperature effect coefficient, T cable (T) represents a cable temperature of time T, T ref represents a reference temperature, Φ (T) represents a voltage phase of time T, Φ ref is a reference phase value, and g represents a g-th inverter of an offshore wind power system.
3. The method for harnessing the harmonic wave of the offshore power generation based on the harmonic compensation and the impedance adjustment according to claim 2, wherein: the method for evaluating the influence of the harmonic on the system based on the monitoring data by setting the harmonic generation factor and the harmonic sensitivity index comprises the steps of introducing the harmonic generation factor HGF and the harmonic sensitivity index HSI, respectively quantifying the contribution of the inverter to the harmonic generation and the sensitivity of the power grid to the harmonic, acquiring the order and the amplitude of the harmonic according to the historical data, determining the harmonic generation coefficient h of the inverter, and determining the harmonic generation factor HGF of the power generation system, wherein the harmonic generation factor HGF is expressed as follows:
Wherein h g denotes a harmonic generation coefficient of the g-th inverter;
A harmonic sensitivity index HSI is determined based on the voltage and current, expressed as:
wherein V n (t) and I n (t) represent the voltage and current amplitudes, respectively, of the nth harmonic at time t.
4. A harmonic compensation and impedance adjustment based marine power generation harmonic remediation method as claimed in claim 3, wherein: the method for evaluating the influence of the harmonic on the system by setting the harmonic generation factor and the harmonic sensitivity index based on the monitoring data further comprises the steps of constructing a comprehensive influence evaluation model for voltage and current harmonic distortion, scoring the harmonic influence of the whole power generation system, and expressing the score as follows:
Wherein THD V (t) and THD I (t) respectively represent a voltage harmonic distortion degree and a current harmonic distortion degree at time t, I 1 (t) represents a fundamental current amplitude, and V 1 (t) represents a fundamental voltage amplitude;
When Q system (t) is lower than a preset standard, the current harmonic influence is considered to be in an allowable range, the harmonic treatment is not carried out, and when Q system (t) exceeds the preset standard, a device efficiency compensation strategy is triggered.
5. A system employing the harmonic compensation and impedance adjustment-based offshore power generation harmonic remediation method of any one of claims 1 to 4, wherein: the system comprises a data acquisition module, a harmonic evaluation module, a compensation module and a parameter adjustment module;
the data acquisition module is used for configuring the sensor to capture key operation parameters of the power grid in real time;
The harmonic evaluation module is used for setting a harmonic generation factor and a harmonic sensitivity index based on the monitoring data to evaluate the influence of the harmonic on the system;
The compensation module is used for quantifying the efficiency of the compensation equipment by combining the harmonic compensation requirement and the system impedance adjustment requirement;
The parameter adjusting module sets a model for minimizing the power quality loss, and adjusts system parameters to realize harmonic treatment.
6. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the harmonic remediation method for offshore power generation based on harmonic compensation and impedance adjustment of any one of claims 1 to 4.
7. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the harmonic remediation method for offshore power generation based on harmonic compensation and impedance adjustment of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410568836.5A CN118157136B (en) | 2024-05-09 | Marine power generation harmonic wave treatment method and system based on harmonic wave compensation and impedance adjustment |
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