A method and system for synchronously measuring parameters of new energy stations

Abstract

The present invention relates to the technical field of data measurement of new energy stations, and specifically to a method and system for synchronous measurement of parameters of new energy stations, including: collecting electrical signals of new energy stations; filtering the collected electrical signals to obtain initial phasors; performing harmonic analysis on the initial phasors to obtain fundamental components; obtaining synchronous phasors according to the fundamental components; and performing time synchronous measurement using synchronous phasors. The present invention removes noise and interference in the signal through filtering and harmonic analysis, and improves the measurement accuracy, which makes the acquisition of synchronous phasors more accurate and reliable. Using synchronous phasors for time synchronous measurement can ensure the temporal consistency of various electrical parameters in new energy stations. Accurate synchronous measurement helps to promptly discover potential problems in the system, such as voltage fluctuations, frequency offsets, etc., so that corresponding measures can be taken to intervene and adjust. This helps to enhance the stability and reliability of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy station data measurement, and in particular to a new energy station parameter synchronous measurement method and system. Background Art

[0002] As the global demand for renewable energy continues to increase, new energy sites such as wind farms and photovoltaic power stations have been widely built and applied around the world. As an important part of clean energy, these new energy sites are of great significance for optimizing energy structure and protecting the environment. However, the efficient operation and scientific management of new energy sites are inseparable from accurate and real-time parameter measurement and data analysis.

[0003] The equipment in new energy stations is diverse and widely distributed. How to achieve synchronous collection and real-time processing of multi-source data is a difficult problem. The parameters in new energy stations change complexly and quickly. How to ensure the accuracy and real-time nature of the measurement data is also an important issue. In addition, the amount of data in new energy stations is huge. How to efficiently process and analyze this data to support the management and operation of the stations is also an urgent problem to be solved.

[0004] Traditional parameter measurement methods for new energy stations often have problems such as low data acquisition accuracy, poor real-time performance, large data volume and difficulty in processing. These problems not only affect the safe and stable operation of new energy stations, but also limit their further application and development in the energy industry. Therefore, it is particularly important to develop an efficient and accurate synchronous measurement method and system for new energy station parameters. Summary of the invention

[0005] (I) Purpose of the invention

[0006] The object of the present invention is to provide a method and system for synchronously measuring parameters of a new energy station which can improve measurement accuracy.

[0007] (II) Technical solution

[0008] In order to solve the above problems, the present invention provides a method for synchronously measuring parameters of a new energy station, comprising:

[0009] Collect electrical signals from new energy stations;

[0010] filtering the collected electrical signal to obtain an initial phasor;

[0011] Performing harmonic analysis on the initial phase quantity to obtain a fundamental wave component;

[0012] According to the fundamental wave component, a synchronized phasor is obtained;

[0013] The synchronized phasors are used to perform time synchronized measurements.

[0014] In another aspect of the present invention, preferably, filtering the collected electrical signal to obtain the initial phasor comprises:

[0015] Determine a filter, and obtain an initial impulse response coefficient of the determined filter;

[0016] Modulating the initial impulse response coefficient to obtain a first impulse response coefficient;

[0017] The electrical signal is filtered using the first impulse response coefficient to obtain an initial phasor.

[0018] In another aspect of the present invention, preferably, the modulating the initial impulse response coefficient to obtain the first impulse response coefficient comprises modulating using the following formula:

[0019]

[0020] 0≤i≤2N

[0021] Where h(i)' is the first impulse response coefficient, h(i) is the initial impulse response coefficient, j is the imaginary unit, e is the base of the natural logarithm, fn is the center frequency of the filter, N is the number of sampling points in the time window, i is the i-th sampling point, T(i) is the sampling time, ω i is the angular velocity at time T(i), and Δt is the sampling time interval.

[0022] In another aspect of the present invention, preferably, filtering the electrical signal using the first filter coefficient to obtain the initial phasor comprises filtering using the following formula:

[0023]

[0024] in, is the initial phasor of the time window, N is the number of sampling points in the time window, i is the i-th sampling point in the time window, h(i)' is the first impulse response coefficient, y[T k (i)] is the electrical signal, T k (i) is the time vector of the i-th sampling point.

[0025] In another aspect of the present invention, preferably, performing harmonic analysis on the initial phasor to obtain the fundamental component comprises:

[0026] Transforming the initial phasor, converting the initial phasor from the time domain to the frequency domain, and obtaining a frequency spectrum;

[0027] According to the frequency spectrum, the frequency of the fundamental wave component is identified to obtain the fundamental wave component.

[0028] In another aspect of the present invention, preferably,

[0029] Transforming the initial phasor, converting the initial phasor from the time domain to the frequency domain, and obtaining the spectrum includes transforming using the following formula:

[0030]

[0031] Where X(m) is the mth frequency component in the frequency domain, is the initial phasor of the time window, m is the frequency index, and j is the imaginary unit.

[0032] In another aspect of the present invention, preferably, identifying the frequency of the fundamental component according to the spectrum comprises calculating the frequency of the fundamental component using the following formula:

[0033]

[0034] Among them, f r is the frequency of the fundamental component, m r is the frequency index of the fundamental component, F r is the sampling frequency, N r is the total number of samples.

[0035] In another aspect of the present invention, preferably, obtaining the synchronized phasor according to the fundamental wave component comprises:

[0036] Use the following formula for the fundamental component:

[0037]

[0038] Among them, X r is the fundamental component, A is the fundamental amplitude, e is the base of the natural logarithm, j is the imaginary unit, and f r is the frequency of the fundamental component, t is the time, is the fundamental phase.

[0039] In another aspect of the present invention, preferably,

[0040] The step of obtaining a synchronized phasor according to the fundamental wave component further comprises:

[0041] Determine the fundamental wave amplitude as the amplitude of the synchronized phasor;

[0042] The fundamental wave phase is determined as the phase of the synchronized phasor.

[0043] In another aspect of the present invention, preferably, a new energy station parameter synchronous measurement system comprises:

[0044] Acquisition module: collects electrical signals from new energy stations;

[0045] Filtering module: filtering the collected electrical signal to obtain an initial phasor;

[0046] Analysis module: performing harmonic analysis on the initial phase quantity to obtain the fundamental component;

[0047] Calculation module: obtaining synchronized phasors according to the fundamental wave components;

[0048] Measurement module: using the synchronized phasor to perform time synchronization measurement.

[0049] (III) Beneficial effects

[0050] The above technical solution of the present invention has the following beneficial technical effects:

[0051] The present invention removes noise and interference in the signal through filtering and harmonic analysis, and improves the measurement accuracy, which makes the acquisition of synchronized phasors more accurate and reliable. The use of synchronized phasors for time synchronization measurement can ensure the temporal consistency of various electrical parameters in the new energy station. This is of great significance for analyzing the dynamic process of the system and fault diagnosis. Accurate synchronous measurement helps to timely discover potential problems in the system, such as voltage fluctuations, frequency offsets, etc., so as to take corresponding measures for intervention and adjustment. This helps to enhance the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is an overall flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0054] Obviously, the described embodiments are only some embodiments of the present invention, but not all 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.

[0055] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Embodiment 1

[0057] A method for synchronously measuring parameters of new energy stations. Figure 1 FIG. 1 shows an overall flow chart of an embodiment of the present invention, as shown in FIG. Figure 1 As shown, including:

[0058] Collect electrical signals from new energy stations; obtain electrical signals such as voltage and current in the stations through sensors and other equipment;

[0059] The collected electrical signal is filtered to obtain an initial phasor; since the electrical signal usually contains various frequency components, including noise and harmonics, it is necessary to remove unnecessary components through filtering and retain the parts useful for subsequent analysis, so as to obtain the initial phasor. The initial phasor refers to the signal waveform after filtering or its corresponding complex number;

[0060] The initial phasor is subjected to harmonic analysis to obtain the fundamental component; harmonic analysis is used to identify the various frequency components in the signal and their amplitude and phase. Through harmonic analysis, the fundamental component (i.e., the main frequency component) and other harmonic components can be extracted from the initial phasor.

[0061] According to the fundamental wave component, the synchronized phasor is obtained; based on the result of harmonic analysis, the synchronized phasor can be further calculated. The synchronized phasor is used to describe the amplitude, phase, etc. of the fundamental wave component (or main frequency component) of the voltage and current signal in the power system.

[0062] The synchronized phasor is used to perform time synchronization measurement; and the synchronized phasor is ensured to be synchronized with a global clock or other reference signal to achieve time synchronization measurement.

[0063] In this embodiment, filtering the collected electrical signal to obtain the initial phasor includes:

[0064] Determine the filter and obtain the initial impulse response coefficient of the determined filter; the filtering process can reduce noise and interference, making the electrical signal clearer, which is conducive to subsequent processing and analysis; selecting a suitable filter can effectively remove noise and interference in the signal and improve the quality and reliability of the signal. The initial impulse response coefficient is a key parameter in the filter design, which determines the performance and characteristics of the filter.

[0065] The initial impulse response coefficient is modulated to obtain a first impulse response coefficient; the modulation process can optimize the performance of the filter to better adapt it to specific signal characteristics and measurement requirements.

[0066] The electrical signal is filtered using the first impulse response coefficient to obtain an initial phasor. Using the modulated coefficient for filtering can more accurately extract useful components of the signal and provide high-quality input for subsequent synchronous phasor calculations.

[0067] In this embodiment, the initial impulse response coefficient is modulated to obtain the first impulse response coefficient, which includes modulating using the following formula:

[0068]

[0069] 0≤i≤2N

[0070] Where h(i)' is the first impulse response coefficient, h(i) is the initial impulse response coefficient, j is the imaginary unit, e is the base of the natural logarithm, fn is the center frequency of the filter, N is the number of sampling points in the time window, i is the i-th sampling point, T(i) is the sampling time, ω i is the angular velocity at time T(i), and Δt is the sampling time interval. Modulating the initial impulse response coefficients ensures that the filter has a linear phase and a good frequency response.

[0071] In this embodiment, filtering the electrical signal using the first filter coefficient to obtain the initial phasor includes filtering using the following formula:

[0072]

[0073] in, is the initial phasor of the time window, N is the number of sampling points in the time window, i is the i-th sampling point in the time window, h(i)' is the first impulse response coefficient, y[T k (i)] is the electrical signal, T k (i) is the time vector of the i-th sampling point. By filtering, high-frequency noise and interference in the electrical signal are removed, making the subsequent analysis more accurate and reliable.

[0074] In this embodiment, further, performing harmonic analysis on the initial phasor to obtain the fundamental component includes:

[0075] The initial phasor is transformed from the time domain to the frequency domain to obtain a spectrum; the initial phasor (i.e., the filtered electrical signal sample) is transformed from the time domain (time domain) to the frequency domain (frequency domain) to analyze the components of the signal in the frequency domain. The most commonly used method is the Fast Fourier Transform (FFT), which is an efficient algorithm that can quickly convert between the time domain and the frequency domain. FFT decomposes the signal in the time domain into a superposition of a series of sine and cosine waves (or complex exponential waves), each of which has its specific frequency, amplitude and phase. Before performing FFT, a window function (such as Hanning window, Hamming window, etc.) is sometimes applied to the signal to reduce the influence of spectrum leakage and fence effect. The window function can smooth the signal to make the spectrum analysis more accurate. The spectrum of the signal is obtained by FFT or other frequency domain transformation methods. The spectrum is a graph with frequency as the horizontal axis and amplitude (or power) as the vertical axis, which shows the relative strength of each frequency component in the signal.

[0076] According to the spectrum, the frequency of the fundamental component is identified to obtain the fundamental component. The frequency of the fundamental component is found in the spectrum, that is, the main frequency in the power system. In the spectrum diagram, the fundamental component may correspond to the largest amplitude (or power) peak. By searching for the maximum peak in the spectrum, the frequency of the fundamental component can be determined. In order to more accurately identify the fundamental frequency, a special frequency recognition algorithm can be used, such as the FFT refinement method based on interpolation, the frequency estimation algorithm based on phase difference, etc. These algorithms can improve the accuracy and stability of frequency recognition. Once the frequency of the fundamental component is determined, the corresponding fundamental component can be extracted from the spectrum.

[0077] In this embodiment, transforming the initial phasor, converting the initial phasor from the time domain to the frequency domain, and obtaining the spectrum includes transforming using the following formula:

[0078]

[0079] Where X(m) is the mth frequency component in the frequency domain, is the initial phasor of the time window, m is the frequency index, and j is the imaginary unit.

[0080] In this embodiment, identifying the frequency of the fundamental component according to the spectrum includes calculating the frequency of the fundamental component using the following formula:

[0081]

[0082] Among them, f r is the frequency of the fundamental component, m r is the frequency index of the fundamental component, F r is the sampling frequency, N r is the total number of samples.

[0083] In this embodiment, obtaining the synchronized phasor according to the fundamental wave component includes using the following formula for the fundamental wave component:

[0084]

[0085] Among them, X r is the fundamental component, A is the fundamental amplitude, e is the base of the natural logarithm, j is the imaginary unit, f r is the frequency of the fundamental component, t is the time, is the fundamental phase.

[0086] The step of obtaining a synchronized phasor according to the fundamental wave component further comprises:

[0087] The fundamental wave amplitude is determined as the amplitude of the synchronized phasor; the fundamental wave phase is determined as the phase of the synchronized phasor. The phase difference of the fundamental wave component relative to a certain reference point can be selected, and this phase difference is the truly meaningful phase information in the synchronized phasor, such as the phase information of the zero crossing point.

[0088] The synchronized phasor is used to perform time synchronization measurement; it can be used in different new energy stations. The phase difference between the synchronized phasors of two new energy stations is first calculated, and the time difference between the two new energy stations can be calculated based on the phase difference and the fundamental component frequency.

[0089]

[0090] in, is the phase difference between the two new energy stations, Indicates the phase of the first new energy station, represents the phase of the second new energy station, Δt represents the time difference between the two new energy stations, and f r1 Indicates the frequency of the fundamental component of the first new energy station. Realizes time synchronization measurement between two new energy stations.

[0091] Embodiment 2

[0092] A new energy station parameter synchronous measurement system, comprising:

[0093] Acquisition module: collects electrical signals from new energy stations;

[0094] Filtering module: filtering the collected electrical signal to obtain an initial phasor;

[0095] Analysis module: performing harmonic analysis on the initial phase quantity to obtain the fundamental component;

[0096] Calculation module: obtaining synchronized phasors according to the fundamental wave components;

[0097] Measurement module: using the synchronized phasor to perform time synchronization measurement.

[0098] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0099] The present invention has been described above with reference to the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

[0100] Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.

[0101] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for synchronously measuring parameters of a new energy station, characterized in that: include: Collect electrical signals from new energy stations; filtering the collected electrical signal to obtain an initial phasor; Performing harmonic analysis on the initial phase quantity to obtain a fundamental wave component; According to the fundamental wave component, a synchronized phasor is obtained; Using the synchronized phasors to perform time synchronized measurements; The step of filtering the collected electrical signal to obtain an initial phasor comprises: Determine a filter, and obtain an initial impulse response coefficient of the determined filter; Modulating the initial impulse response coefficient to obtain a first impulse response coefficient; filtering the electrical signal using the first impulse response coefficient to obtain an initial phasor; The modulating the initial impulse response coefficient to obtain the first impulse response coefficient includes modulating using the following formula: in, is the first impulse response coefficient, is the initial impulse response coefficient, j is the imaginary unit, e is the base of the natural logarithm, fn is the center frequency of the filter, N is the number of sampling points in the time window, i is the i-th sampling point, T(i) is the sampling time, is the angular velocity at time T(i), Δt is the sampling time interval; The filtering of the electrical signal by using the first impulse response coefficient to obtain the initial phasor includes filtering by using the following formula: in, is the initial phasor of the time window, N is the number of sampling points in the time window, i is the i-th sampling point in the time window, is the first impulse response coefficient, y[T k (i)] is the electrical signal, T k (i) is the time vector of the i-th sampling point.

2. The method for synchronously measuring parameters of new energy stations according to claim 1 is characterized in that: Performing harmonic analysis on the initial phase quantity to obtain the fundamental wave component includes: Transforming the initial phasor, converting the initial phasor from the time domain to the frequency domain, and obtaining a frequency spectrum; According to the frequency spectrum, the frequency of the fundamental wave component is identified to obtain the fundamental wave component.

3. The method for synchronously measuring parameters of new energy stations according to claim 2 is characterized in that: Transforming the initial phasor, converting the initial phasor from the time domain to the frequency domain, and obtaining the spectrum includes transforming using the following formula: Where X(m) is the mth frequency component in the frequency domain, is the initial phasor of the time window, m is the frequency index, and j is the imaginary unit.

4. The method for synchronously measuring parameters of new energy stations according to claim 3 is characterized in that: The identifying the frequency of the fundamental component according to the spectrum includes calculating the frequency of the fundamental component using the following formula: Among them, f r is the frequency of the fundamental component, m r is the frequency index of the fundamental component, F r is the sampling frequency, N r is the total number of samples.

5. The method for synchronously measuring parameters of new energy stations according to claim 4 is characterized in that: The obtaining of the synchronized phasor according to the fundamental wave component includes using the following formula for the fundamental wave component: Among them, X r is the fundamental component, A is the fundamental amplitude, e is the base of the natural logarithm, j is the imaginary unit, f r is the frequency of the fundamental component, t is the time, is the fundamental phase.

6. The method for synchronously measuring parameters of new energy stations according to claim 5 is characterized in that: The step of obtaining a synchronized phasor according to the fundamental wave component further comprises: Determine the fundamental wave amplitude as the amplitude of the synchronized phasor; The fundamental wave phase is determined as the phase of the synchronized phasor.

7. A new energy station parameter synchronous measurement system, characterized in that: include: Acquisition module: collects electrical signals from new energy stations; Filtering module: filtering the collected electrical signal to obtain an initial phasor; Analysis module: performing harmonic analysis on the initial phase quantity to obtain the fundamental component; Calculation module: obtaining synchronized phasors according to the fundamental wave components; Measurement module: using the synchronized phasor to perform time synchronization measurement; The step of filtering the collected electrical signal to obtain an initial phasor comprises: Determine a filter, and obtain an initial impulse response coefficient of the determined filter; Modulating the initial impulse response coefficient to obtain a first impulse response coefficient; filtering the electrical signal using the first impulse response coefficient to obtain an initial phasor; The modulating the initial impulse response coefficient to obtain the first impulse response coefficient includes modulating using the following formula: in, is the first impulse response coefficient, is the initial impulse response coefficient, j is the imaginary unit, e is the base of the natural logarithm, fn is the center frequency of the filter, N is the number of sampling points in the time window, i is the i-th sampling point, T(i) is the sampling time, is the angular velocity at time T(i), Δt is the sampling time interval; The filtering of the electrical signal by using the first impulse response coefficient to obtain the initial phasor includes filtering by using the following formula: in, is the initial phasor of the time window, N is the number of sampling points in the time window, i is the i-th sampling point in the time window, is the first impulse response coefficient, y[T k (i)] is the electrical signal, T k (i) is the time vector of the i-th sampling point.

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