KR20230037815A - Automatic operation system and method for sluice of single action tidal power generation using real-time tide level estimation method - Google Patents

Abstract

The present invention relates to a system and a method for automatically operating a sluice for tidal barrage type tidal power generation using a real-time tide level estimation method, which can predict a tide level by using a model that fits a real-time actual tide level, to search for an opening and closing start point that can secure the maximum water discharge amount, thereby automatically operating a sluice according to tidal changes. The system obtains an angular velocity model to be used at the time of opening the sluice by fitting an actual tide level obtained prior to the time of opening the sluice, searches for the optimal time of starting to open the sluice by using an angular velocity model updated adaptively to the actual tide level, at the time of opening the sluice, and controls the opening of the sluice, obtains an angular velocity model to be used at the time of closing the sluice by fitting an actual tide level obtained prior to the time of closing the sluice, and searches for the optimal time of starting to close the sluice by using an angular velocity model updated adaptively to the actual tide level, at the time of closing the sluice, and controls the closing of the sluice. The system comprises a sluice control unit (100) for controlling a sluice (10).

Description

Automatic operating system and method for floodgates of creative tidal power generation using real-time tide level prediction method

The present invention is a creative assistance method using a real-time tide level prediction method that adapts to tidal changes and enables automatic operation of floodgates by predicting the tide level with a model fitted with real-time measured tide level and searching for the opening/closing start point that can secure the maximum displacement. It relates to a water gate automatic operation system and method for power generation.

A tidal power generation method that produces electricity by using the water head difference (drop) between the water level (drop) between the lake and the lake created by constructing an embankment (or embankment) and the tidal level generated by tidal phenomena. In the tidal power generation method, the maximum amount of power generation can be obtained at high tide only when the amount of drainage is maximized at low tide, so the operation method of the water gates (main sluice gate, drainage gate) installed for drainage is very important.

1 is a graph showing the operation time of a water wheel and a water gate for creative tidal power generation.

)는 평균해수위(M.S.L)를 기준으로 대략 하루 2회의 주기성을 갖는 정현파 형태로 변동한다. condolence(

) fluctuates in the form of a sinusoidal wave with a periodicity of about twice a day based on the mean sea level (MSL).

)가 호수위(

)보다 높을 때에 수두차(

)에 의한 수압차를 이용하여 수차를 회전시켜 전력을 생산하고, 전력을 생산할 때에 호수로 유입된 해수를 조위가 호수위보다 낮을 때에 외해로 배수하여 다음 주기에 외해의 해수를 호수로 유입시키며 전력을 생산할 수 있게 한다. 실제 조력발전소를 운영할 시에 수차를 가동시켜 전력을 생산하는 발전 기간은 전력량을 최대한 확보할 수 있는 발전개시수두차(

)일 때부터 수차를 가동시켜 전력 생산할 수 있는 최소발전수두차(

)일 때까지 또는 호수위가 관리수위에 도달할 때까지이므로, 발전대기 동작, 발전 동작, 배수대기 동작 및 배수 동작으로 이루어지는 일련의 동작을 조위의 주기에 맞춰 반복한다.And, in the creative tidal power plant, the tidal level (

) is on the lake (

) when it is higher than the head difference (

) generates electricity by rotating an aberration using the water pressure difference caused by the water pressure, and when generating electricity, the seawater that flows into the lake is drained to the open sea when the tide level is lower than the lake, and the seawater from the open sea flows into the lake in the next cycle. make it possible to produce When operating an actual tidal power plant, the power generation period during which the aberration is operated to produce power is the power generation start-up head difference (

), the minimum power generation head difference (

) or until the lake level reaches the management water level, a series of operations consisting of standby operation for power generation, operation for power generation, standby operation for drainage, and drainage operation are repeated according to the cycle of the tidal level.

As can be seen from this, it is necessary to increase the amount of seawater introduced into the lake as much as possible at the time of the drainage operation to ensure the maximum amount of power generation in the power generation operation.

However, due to the lifting capacity of the winch that operates the water gate and the height of the water gate, a predetermined time is required to open the water gate, and a predetermined time is also required to close the water gate. Taking the Sihwa Lake tidal power plant, which adopts the creative tidal power generation method as an example, the time required for opening and closing the gates is approximately 24 minutes, respectively. Therefore, by searching in advance the operation time (or water head difference at the time of operation) for opening the floodgate and the operation time (or water head difference at the time of operation) for closing the water gate at which the maximum displacement can be secured, the sluice gate is matched to the searched operation time point. should be activated.

According to the patent registration No. 10-1792190 of the applicant of the present invention, after searching in advance for the optimal sluice gate opening and closing head differences according to the tide level prediction data, geographic data and management water level, the measured tide level and lake level By monitoring the water head difference and determining the time to open and close the water gate, it is possible to secure the maximum amount of displacement.

However, the tidal level prediction data used to search for the optimal sluice gate opening and closing head difference is based on the data measured at the tidal level observation station (tide station), and the short-period change of the tide (approximately 1 Since it is data that predicts changes within a month) or long-term changes (changes within a year), it may differ from the actually measured tide level.

In other words, harmonic analysis is an analysis method using a numerical model of the level of tide expressed as a plurality of periodic functions (or periodic functions of tidal waves) having harmonic constants (amplitude and phase). , the tidal level that appears differently in each tide can be predicted using a numerical model formula.

However, as can be seen from the tide of the 15-day period illustrated in FIG. 2, the tide level may be different from the tide level predicted through harmonic analysis due to the influence of meteorological conditions, etc. there is. In other words, looking at the 30 tides of the full moon period illustrated in FIG. 2, the patterns that appear differently for each tide can be predicted using the tide level numerical model formula used in harmonic analysis, but it is difficult to accurately reflect the influence of weather conditions and the like.

Therefore, in the Sihwa Lake tidal power plant, the optimal sluice gate opening head difference, which does not show a large difference according to the size of the tide, is applied as a uniform value, and the optimal sluice gate closing head difference, which differs greatly according to the size of the tide, is applied according to the size of the tide. Establish the operation standards applied by classifying the tide level and the tide level, and let the power plant worker determine the size of the tide by referring to the fluctuations in the predicted tide level and the measured tide level. In addition, it was operated in a way that automatically opens and closes the floodgates according to the water head difference obtained through actual measurement.

However, this sluice operation method cannot be fully automated, and it is impossible to operate it optimally according to the different tide level for each tide as the size of the tide is classified into three stages. cannot be operated in response, resulting in drainage losses that differ from the maximum possible displacement.

On the other hand, a technique for predicting the tide level by adaptively reflecting the change in sea level measured in real time is also known, but this technique is a technique of adjusting the harmonic constant according to the change in sea level in the tide level numerical model used for harmonic analysis, It is possible to increase the accuracy of the tide level numerical model formula expressing , but there is a limit to accurately expressing the tide level that gradually fluctuates in real time. Accordingly, when applied to the operation of a sluice gate in which the opening/closing timing of the sluice gate must be determined according to the change in tidal level in order to obtain the maximum displacement, the opening/closing timing may not be optimally determined.

KR 10-1792190 B1 2017.10.25. KR 10-2016-0047828 A 2016.05.03.

Adaptive Tide Level Prediction Method Using Observations, Journal of the Electronics and Telecommunications Society v.12 no.5,pp. 891 - 898 , 2017 , 1975-8170 , Electronics and Telecommunications Society of Korea

Therefore, the present invention obtains a tidal level prediction model that reflects the measured tide level as it is before the section to search for the optimal opening and closing time of the floodgate, and then adaptively updates it to follow the gradually changing tide level, so that the tide level in the section to be searched is more accurate. The objective is to provide an automatic floodgate operation system and method for creative tidal power generation using a real-time tide level prediction method that can accurately predict and automatically operate the floodgate by obtaining the optimal opening and closing time according to the predicted tide level.

In order to achieve the above object, the present invention provides an automatic floodgate operation system for creative tidal power generation, which includes a water level observation unit 200 that obtains the actually measured tide level and the actually measured lake level, and a floodgate control unit 100 that controls the floodgate 10. The sluice gate control unit 100 includes an opening time angular velocity model generator 110 that generates a cos function obtained by fitting the measured tide level obtained prior to the sluice gate opening time as an angular velocity model to be used at the sluice gate opening time; The process of updating the angular velocity model according to the actually measured tide level at the time of opening the floodgates, and the process of searching for the opening start time to be the preset opening rate when the tide level predicted by the angular velocity model and the lake level predicted according to the opening of the floodgate are equal an opening control unit 120 that controls opening of the water gate 10 at the searched water gate opening time by repeating every time the measured tide level is obtained; a closing time angular velocity model generating unit 130 for generating a cos function obtained by fitting the measured tide level obtained prior to the closing time of the gate as an angular velocity model to be used at the closing time of the gate; The process of updating the angular velocity model according to the measured tide level at the time of closure of the sluice gate, and the process of searching for the closure start point to be the preset opening rate when the water level predicted by the angular velocity model and the lake level predicted according to the closure of the sluice gate are equal and a closing control unit 140 that repeats every time the measured tide level is obtained and controls the closing of the water gate 10 at the searched water gate closing time point.

In order to achieve the above object, the present invention automatically controls the opening and closing operation of the floodgate 10 according to the measured tide level and the measured lake level obtained by measuring the water level by the water level observation unit 200. An operating method comprising: generating an angular velocity model at the opening time (S10) of generating an angular velocity model to be used at the opening time of a cos function obtained by fitting the measured tide level obtained prior to the opening time of the sluice gate; The process of updating the angular velocity model according to the actually measured tide level at the time of opening the floodgates, and the process of searching for the opening start time to be the preset opening rate when the tide level predicted by the angular velocity model and the lake level predicted according to the opening of the floodgate are equal An opening control step (S20) of controlling the opening of the water gate 10 at the searched water gate opening time point by repeating every time the measured tide level is obtained; A closing time angular velocity model generation step (S30) of generating a cos function obtained by fitting the measured tide level obtained prior to the sluice gate closing time as an angular velocity model to be used at the sluice gate closing time; The process of updating the angular velocity model according to the measured tide level at the time of closure of the sluice gate, and the process of searching for the closure start point to be the preset opening rate when the water level predicted by the angular velocity model and the lake level predicted according to the closure of the sluice gate are equal A closing control step (S40) of controlling the closing of the water gate 10 at the searched water gate closing time point by repeating every time the measured tide level is obtained; includes

The present invention can more accurately predict the water level at the time of opening and closing the water gate by using a model fitting the measured water level immediately before the time of opening and closing the water gate, and can calculate the maximum displacement by using a model that is adaptively updated in real time to the water level at the time of opening and closing the water gate. It is possible to more accurately search for an opening/closing start time to secure the water gate operation to secure the maximum displacement.

1 is a graph showing the operation time of a water wheel and a water gate for creative tidal power generation.
Figure 2 is a tide level graph illustrating the tide of the full moon period.
3 is a block diagram of an automatic sluice gate operation system for creative tidal power generation according to an embodiment of the present invention.
Figure 4 is a table showing the correlation between the opening rate and the discharge amount at the time of the same water level.
5 shows the high tide level and the inflection point searched for to generate an angular velocity model used to predict the tide level _at the time of opening the water gate (DO ), the optimal opening start time (t _O ) searched for at the time of opening the water gate (DO ₎ , and _{. _ _} graph.
6 and 7 are flow charts of a method for automatically operating a water gate for creative tidal power generation according to an embodiment of the present invention.

Hereinafter, specific and various examples will be shown and described so that those skilled in the art can easily practice the embodiments of the present invention with reference to the accompanying drawings.

According to an embodiment of the present invention, the water gate automatic operation system of the creative tidal power plant operates the aberration generator at a time when the tide level is higher than the lake level in the creative tidal power plant, so that the seawater flowing into the lake is opened at the time when the tide level is low. It is a system that automatically opens and closes the floodgates to drain water through, searches for the opening and closing times that can secure the maximum displacement by using a tide level model that adapts to the measured tide level, and controls the floodgates according to the searched times.

Although the tide has a periodicity of approximately 12 hours and 25 minutes, it is precisely represented by the sum of minute tides with different periods, amplitudes, and phases, so that the tides for each period are different and gradually change between each tide.

The present invention uses a tide level model that adapts to the change of each tide, more accurately predicts the tide level at the time of draining, and in particular, adapts to changes in the tide level due to meteorological influences such as atmospheric pressure, wind, precipitation, and season. It is possible to more accurately predict the tide level of the season. Using this tidal level model, it is possible to automatically operate the water gate to secure the maximum displacement, and eventually secure the maximum amount of power that can be produced by the water turbine generator.

As shown in the block configuration diagram of FIG. 3, the floodgate automatic operation system of creative tidal power generation for this purpose includes a water level observation unit 200 that measures the tide level and lake level in real time and obtains the actual tide level and the actual lake level in real time, as shown in the block diagram of FIG. The tide level model for prediction is created and updated in real time according to the measured tide level, and the tide level and lake level when the time required to open or close the floodgate 10 elapses are predicted in advance, and the start point selection criteria described later and a sluice gate control unit 100 that controls opening and closing of the sluice gate 10 when it meets .

The sluice gate 10 is subject to opening and closing control according to the present invention, and includes all sluice gates of drainage passages capable of draining seawater flowing into the lake. In general, a water wheel is also installed with a generator installed to allow seawater from the open sea to flow into the lake. The water wheel is opened to operate the generator, and the water wheel is opened to discharge the lake water even when draining Therefore, in this case, the water gate 10 includes a water gate installed on the water wheel. In addition, taking the Sihwa Lake tidal power plant as an example, the sluice gate 10 has an expanded meaning including all main sluice gates and drainage sluice gates that can be used for drainage, including main sluice gates and drainage sluice gates classified according to the purpose of operation. have As an example, roughly examining the drainage burden rates of the water main gate, drainage sluice gate, and water wheel used when draining water at the Sihwa Lake tidal power plant, 67% of the main water gate, 9% of the drainage sluice gate, and 24% of the water wheel are installed to drain the water. is being operated

The water level observation unit 200 measures the water level of a lake created by building a tide level observation unit 210 for measuring the tide level from the sea level of the open sea and a seawall (or tidal dam, embankment) for creative tidal power generation Including the lake level observation unit 220, the measured tide level and the measured lake level are obtained in real time.

Here, the water level observation unit 200 obtains measurement data that more accurately reflects real-time changes by shortening the measurement period if possible, so that the control unit 100 predicts the tide level based on a more accurate tide level model, and more accurately It is better to reflect the lake surface and to be able to more precisely search for the optimal opening and closing time. For example, at the Sihwa Lake tidal power plant operated as a creative tidal power plant, measurement is performed in units of one minute to obtain measurement data that reflects real-time changes more accurately.

Since the water level observation unit 200 is a well-known configuration and is installed and operated in an actual tidal power plant itself, a detailed description thereof will be omitted.

The sluice control unit 100 has preset criteria for selecting a start time to be applied when selecting the start time for opening and closing the sluice gate to secure the maximum displacement, and the opening for controlling the opening operation of the sluice gate 10. It includes a timing angular velocity model generating unit 110 and an opening control unit 120, and a closing timing angular velocity model generating unit 130 and a closing control unit 140 for controlling the closing operation of the water gate 10.

First, the starting point selection criteria will be described.

When the sluice gate 10 is opened, a predetermined time is required for the opening rate to start at 0%, which is the fully closed state at the time of opening, gradually increase, and then reach 100%, which is the fully open state, at the time of completion of the opening. Similarly, when the sluice gate 10 is closed, a predetermined time is required for the opening rate to start at 100%, which is the fully open state at the time of starting the closing, gradually decrease, and then reach 0%, which is the fully closed state at the time of completion of the closing. For example, the water gate installed and operated in the Sihwa Lake tidal power plant, the weight of the water gate reaches several hundred tons, the height of the water gate is 12 m, and the lifting capacity of the winch that opens and closes the water gate is 0.5 m / min. It takes approximately 24 minutes to open the floodgates, and approximately 24 minutes equal to the opening time when closing the floodgates.

Therefore, if the opening start time of the floodgate is set to the same water level point as the tidal level and the lake level, and the start point of the gate closing is also set to the same water level time point, the discharge can be performed without backflow, but the flow back into the lake for a predetermined time after the start point is possible. However, the total displacement is smaller than in the case of starting to open before the time of the same water level and starting to close before the time of the same water level.

Accordingly, in order to analyze the effect of the opening rate at the same water level at the time of opening and closing on the displacement, the applicant utilized the data related to 705 tides for a period of one year obtained from the Sihwa Lake Tidal Power Plant and presented the results shown in the table of FIG. got it

The displacement shown in the table of FIG. 4 is 0%, 20%, 40%, 0%, 20%, 40%, respectively. These are the multiples obtained by changing to 50%, 60%, 80% and 100%. Here, the negative (-) sign for the displacement means that the seawater in the lake is drained into the open sea.

For example, in the case of a sluice gate with an opening time and a closing time of 24 minutes, respectively, the amount of drainage in the case of an open opening rate of 0% and a closed opening rate of 0% is 24 minutes prior to opening and starting when the water level is equal and completely closing when the water level is equal. This is the total displacement amount drained when the closing operation is initiated.

Looking at the displacement amount shown in the table of FIG. 4, the displacement amount can be relatively increased during opening and closing so that the open rate and the closed rate have values within the range of 40 to 60%, respectively. Looking more closely, the maximum displacement can be obtained when the open rate and the closed rate have values within the range of 40 to 60%, and at least one of the open rate and closed rate has a value of 50%. . In practice, the maximum displacement can be obtained when both the open rate and the closed rate are set to 50%, but depending on the operating conditions of the creative tidal power plant, it is better to set the value within the range of 40 to 60% even if it is not set to 50%. .

Accordingly, the open opening rate and the closed opening rate at the same water level are preset within a range of 40 to 60%, respectively.

In addition, the starting time selection criterion is determined to be a predetermined opening rate when the tidal level and the lake level are at the same water level. That is, the opening start time is selected as the time when the opening operation of the sluice gate 10 is started and the gradually increasing opening rate becomes the same level when reaching the preset opening opening rate, and the closing start time is the sluice gate 10 When the closing operation is initiated and the gradually decreasing opening rate reaches the preset closing opening rate, the point in time is selected.

Hereinafter, in the description of the embodiment of the present invention, the preset open opening rate and the preset closed opening rate are set to 50%, respectively, and the operation of the water gate 10 ends from the start of the operation when the opening operation and the closing operation are performed. It takes 24 minutes as the opening rate changes at a constant rate until the point in time, and the water level observation unit 200 measures the tide level and the lake level at a 1-minute interval. it is not going to be

That is, in the embodiment of the present invention, the opening start time and the close start time selected according to the start time selection criterion are searched for as the start time that becomes the same water level at the 50% opening rate, and accordingly, the same water level. Let the operation start 12 minutes earlier.

In order to search for the start time of opening and the start time of closing, a tide level model for predicting the tide level is used to predict the water level until at least 12 minutes after every 1 minute, which is the observation period of the water level observer 200, and start opening. The time point and closing start time point are searched.

The tidal level prediction model at this time uses the angular velocity model as the basic model, as described later, but uses the angular velocity model to be used at the time of opening the gate and the angular velocity model to be used at the time to close the gate. Polynomial model is selectively used according to the error of the angular velocity model use instead

Referring to FIG. 5, the sluice control unit 100 will be described in detail.

5 shows the high tide level (H _H ) and inflection points searched for to generate an angular velocity model to be used to predict the tide level at the time of opening the water gate ( _DO ), and the optimal opening start time (searched for at the time of opening the water gate (DO ₎ ) ( t _O ), the low tide level (H _L ) searched for to generate an angular velocity model to be used to predict the tide level at the sluice gate closure time (D _C ), and the optimal closing start time (D C ) searched for at the sluice gate closure time (D _C ) It is a graph of tide level and lake level showing t _C ).

The opening time angular velocity model generator 110 generates an angular velocity model obtained by fitting the measured water level measured every minute with a cos function prior to the water gate opening time ( _DO ) to predict the water level at the water gate opening time ( _DO ). to use it to To this end, after the high tide level (H _H ) and the inflection point after high tide are searched, an angular velocity model is created according to the high tide level and the inflection point.

Here, the floodgate opening time ( _DO ) can be determined according to the periodicity of the tide, but in general, it is determined after the inflection point in creative tidal power generation, so it can be determined after the inflection point is expressed and the angular velocity model is obtained. That is, according to the present invention, the water gate opening time _DO arrives after obtaining the angular velocity model by searching for the high tide level and the inflection point at every tide.

The angular velocity model to be used at the time of opening the floodgates is generated by the cos function as shown in Equation 1 below by reflecting the searched high tide level (H _H ) and the inflection point.

In Equation 1, the amplitude (H) is a value obtained by subtracting the inflection point tide level (H _P ) from the high tide level (H _H ), and the period is a value obtained by subtracting the high tide level time from the inflection point time (T _{1/4, O} ) is a value multiplied by 4.

In addition, it can be seen that the angular velocity model expressed by Equation 1 is a cos function with the high tide level at t = 0, and is shifted to the tide level axis (y-axis) by the inflection point tide level (H _P ).

However, since the measured tide level is obtained at 1-minute intervals, as a way to search for a more accurate high tide level (H _H ), the high tide level (H _H ) can be searched by applying an interpolation method to the measured tide level.

As a specific method, a polynomial approximation method using a second-order polynomial may be applied. That is, after approximating the measured tide level obtained for a predetermined period including the maximum measured tide level with a second-order polynomial, the maximum value in the second-order polynomial, that is, the value at the time calculated by the root formula is obtained, and the high tide level (H _H ) can be selected as a value. This interpolation method is a known method, and since various methods other than the polynomial approximation method are known, a detailed description thereof will be omitted.

The inflection point is the point at which the slope having a negative (-) value between high tide and low tide is the minimum in the graph of the measured tide level, and the difference between the measured tide level measured temporally adjacent to the measured tide level measured at 1 minute intervals is the minimum. It can be obtained by exploring the in point. That is, the slope of the tide level gradually decreases at low tide after the high tide level, becomes minimum at the inflection point, and then gradually increases until reaching the low tide level, so that the inflection point can be obtained as the slope. If the measurement period is 1 minute, the slope is obtained at 1-minute intervals by subtracting the measured tide level measured 1 minute ago from the measured tide level measured in real time at 1-minute intervals, and the change in slope is monitored, and the minimum time is set as the inflection point. select

Meanwhile, in order to more accurately obtain the inflection point, an interpolation method may be applied to gradient data obtained for a predetermined time centered on the time at which the minimum gradient appears after obtaining an additional gradient for a predetermined time after the minimum gradient is searched. there is. As a specific method, by applying the method applied when searching for the high tide level, after approximating the slope value obtained at 1-minute intervals with a quadratic polynomial, the minimum value in the quadratic polynomial, that is, the time point calculated by the root formula The value of can be selected as the inflection point.

The cos function reflecting the high tide level (H _H ) and the inflection point selected in this way uses the difference between the high tide level (H _H ) and the inflection point tide level (H _P ) as an amplitude, as shown in Equation 1, and the The value obtained by multiplying the difference by 4 is the tidal period, and it becomes a function of adding the inflection point tidal level (H _P ) as a constant.

The opening controller 120 repeats the following three operations at intervals of 1 minute at the gate opening time ( _DO ) that arrives after generating the angular velocity model.

As a first operation, the angular velocity model is updated in real time according to the measured tidal level measured in real time to obtain an angular velocity model that more accurately represents the measured tidal level at the opening time (DO ₎ .

As a second operation, the suitability of the angular velocity model is judged according to the tidal level error predicted by the angular velocity model, and if it is judged suitable, the angular velocity model is selected as the opening time tide level model. is selected as the opening period tide level model.

As a third operation, when the tidal level predicted using the selected opening time tide level model and the lake level predicted according to the opening of the water gate 10 are at the same water level, the preset opening rate, that is, the opening start time point to be set to 50% opening rate is searched. .

When the opening start time to achieve 50% opening rate is searched while repeating three operations at 1-minute intervals, the water gate 10 is opened according to the searched opening start time.

Specifically, the difference between the measured tide level and the predicted tide level at the time of measurement of the actual tide level calculated by the angular velocity model before the update is set as a prediction error, and the angular velocity model can be updated to reduce the prediction error.

At this time, the angular velocity model may be updated as shown in Equation 2 below having variables a and b that increase or decrease the amplitude or period.

In other words, the tide level appears as a synthesis of tidal waves with different harmonic constants such as amplitude, period, phase, and perception. Here, it is difficult to express with a cos function simplified to high tide level and inflection point due to the influence of the weather, and it is difficult to express from the previous tide to the next tide. In the present invention, in order to adapt to such a gradual change, the angular velocity model can be updated at 1-minute intervals according to the measured tidal level at 1-minute intervals.

Since the update of the angular velocity model is performed according to the measured tidal level after the inflection point, the following can be done.

If the measured tidal level is greater than the predicted tidal level calculated with the angular velocity model 1 minute ago, that is, the angular velocity model before updating, decrease the amplitude or increase the period, and if the measured tidal level is smaller than the predicted tide level, increase the amplitude or By reducing the period, an angular velocity model that can reduce the error with the measured tidal level is obtained.

However, since the searched inflection point does not accurately reflect the different characteristics for each tide, and there may be a search error, the period is first corrected, and even if the period is corrected, the error does not decrease to within the preset error and continues to occur The angular velocity model can also be updated by further modifying the amplitude.

On the other hand, since the characteristics of each tide are different, if the model is updated with a model that can accurately represent the measured tide level, the variability of the model may be severe, making it difficult to follow the characteristics of the tide. Accordingly, when the amplitude or period is corrected according to the measured tidal level in a 1-minute period, the prediction error is corrected only by the preset correction value, that is, the preset amplitude correction value or the preset cycle correction value, only when the prediction error exceeds the preset error. It is good. That is, the variable a or variable b in Equation 2 is increased or decreased by a predetermined value only when the error is greater than or equal to the preset error.

Next, after fitting the measured tide level obtained earlier with a polynomial, the current tide level is predicted by extrapolation using the polynomial, and the prediction error between the current tide level predicted by extrapolation and interpolation using the polynomial and the current measured tide level. get In addition, the prediction error between the current tide level predicted by the angular velocity model before updating and the current measured tide level is obtained and compared with the prediction error obtained by the polynomial. At this time, when the prediction error obtained by the polynomial is less than the prediction error obtained by the angular velocity model, the polynomial is selected as the open season tide level model, and when the prediction error obtained by the polynomial is greater than the prediction error obtained by the angular velocity model, the angular velocity model is selected as the open season tide level model choose

Here, as the polynomial model to be used for extrapolation and interpolation, it is preferable to adopt a polynomial having a relatively small level error by using both a first-order polynomial and a second-order polynomial.

Since the measured tide level is measured at 1-minute intervals, the current tide level predicted by the first-order polynomial model can be obtained according to the formula simplified by Equation 3 below.

Here, h(t) is a predicted value of the current tide level, h(t-1) is the measured tide level 1 minute ago, and h(t-2) is the measured tide level 2 minutes ago. Δh(t-1) is the slope of the measured tide level 1 minute ago.

If the first-order polynomial model is selected as the open season tide level model to predict the tide level after the present, it can be predicted by Equation 4 below by applying the slope calculated from the current measured tide level.

Here, Δt is a predicted time in units of 1 minute, and if 12 minutes later is predicted, a value of 12 is substituted into Equation 4. h(t+Δt) becomes the predicted tide level at the time when the predicted time Δt has elapsed. In Equation 4, time t is expressed in units of 1 minute, but as will be described later, Δt, which is substituted when searching for an optimal opening start time, may not be a value in units of 1 minute.

Since the current tide level predicted by the second-order polynomial model likewise has a constant measurement period of 1 minute, it can be obtained according to the formula simplified by Equation 5 below.

Here, h(t-3) is the measured tide level 3 minutes ago, and Δ ² h(t-1) is the gradient change 1 minute ago.

If the second-order polynomial model is selected as the open season tide level model to predict the tide level after the present, it can be predicted by Equation 6 below by reflecting the slope and slope change calculated by applying the currently measured tide level.

As described above, the tide level at least until 12 minutes later is predicted by using the tide level model of the opening period selected from the angular velocity model and the polynomial model, and the opening start time to be equal by predicting the lake level that changes according to the opening of the water gate (10) explore

Since the time required to start opening the gate 10 and reach the preset opening rate of 50% is 12 minutes, the maximum predicted time should be at least 12 minutes.

An embodiment in which the opening start time is searched ahead by a predetermined time and the water gate 10 is opened when the searched opening start time is reached will be described. In this embodiment, a case where 15 minutes is set by adding 3 minutes to 12 minutes required to reach the preset opening rate of 50% will be described.

The time is gradually increased from the current time to 3 minutes later to search for the opening start time that meets the starting time selection criteria, but assuming that the water gate 10 is started to open at each time point, the lake level and the tide level after 12 minutes are predicted , it is checked whether the water level becomes equal, and if the time point at which the water level becomes equal is searched for, the searched time point is selected as the optimal opening start time point.

The tide level can be predicted using the open season tide level model selected above. Of course, the angular velocity model can be calculated by substituting the gradually increasing prediction time, and the polynomial model can be calculated by substituting the prediction time into Δt in Equations 4 and 6 above.

Since the lake level is constant from the time the aberration generator is stopped until the start of the opening, it can be predicted by reflecting the amount of change due to the opening of the water gate 10 on the measured lake level at the current time. The amount of change in the lake level following the opening of the floodgate (10) was determined by geographic data that established the relationship between the volume (or volume) of the lake and the lake level according to the data on the water surface area within the lake by lake level, and the tide level model during the opening period during the opening. It can be predicted using the head difference calculated according to the predicted tidal level. This method of predicting the change in the lake level is a method of predicting the change in the sea level by repeating the process of correcting the volume of the lake and integrating the amount of drainage by calculating the instantaneous drainage flow rate according to the change in water head. Since it is a well-known known method, detailed description is omitted. On the other hand, according to the operating experience of the creative tidal power plant in Sihwa Lake, the displacement during opening of the floodgate does not show a large difference according to the difference in water head. can be obtained and used to estimate the change in lake level.

In this way, the process of updating the angular velocity model according to the measured tide level measured at intervals of 1 minute, which is the measurement period of the water level observation unit 200, the process of selecting the optimal opening time level model, and the opening start time search time of 3 minutes While the process of searching for the optimal opening start time meeting the starting time selection criterion is repeated at intervals of 1 minute, when the optimal opening start time is searched for, the gate 10 is opened according to the searched optimal opening start time. The opening control of the water gate 10 is performed so as to start.

After controlling the opening of the gate 10, the closing time angular velocity model generation unit 130 and the closing control unit 140 meet the starting time selection criterion (the criterion that the preset opening rate must reach 50% at the same water level). It is controlled to close the water gate 10 at the optimal closing start time.

As shown in the graph _{of FIG. 5, the closing time angular velocity model generation unit 130, as shown in the graph of FIG .} D _C ) Create an angular velocity model that fits the previously measured tidal level with a cos function. The angular velocity model at this time is the model to be used at the time of closing the gate (D _C ).

In the creation-type tidal power generation, the sluice gate closing time (D _C ) is determined after a predetermined time elapses after the low tide level (H _L ). This is because the sea level of the lake is drained only through the sluice gate even if the sluice gate is opened, and the lake level decreases at a rate lower than the tidal level. The sluice gate closing time ( _DC ) can be set in advance according to the periodicity of the tide, but it is set to start after a predetermined time elapses after the low tide level ( _HL ), or to search for the low tide level ( _HL ). It may be started after the measured tide level is obtained, that is, after the angular velocity model to be used at the sluice gate closing time (D _C ) is generated.

Since the angular velocity model generated here is a model to be used for the sluice gate closing time ( _DC ), in order to obtain the amplitude and cycle like the angular velocity model created for use at the sluice gate opening time described above, the sluice gate closing time D _C ) Search the low tide level ( _HL ) from the measured tide level measured in the previous period. As the inflection point, the inflection point searched for by the angular velocity model generating unit 110 at the opening time is used.

In addition, the angular velocity model to be used at the sluice gate closing time (D _C ) has the difference between the low tide level (H _L ) and the inflection point tide level (H _P ) as the value of the amplitude (H) as shown in Equation 7 below, and the low tide level time and the inflection point It is created as a cos function with a value of period (T) that is 4 times the difference in time (T _1/4,C ).

It can be seen that the angular velocity model generated by Equation 7 is a cos function with the low tide level time point as t = 0, and is shifted to the tide level axis (y-axis) by the inflection point tide level (H _P ).

When searching for the low tide level (H _L ), a predetermined section is set before and after the lowest actually measured tide level among the measured tide levels measured every minute of the measurement period, and interpolation is applied to the measured tide level measured in this predetermined section. By searching by applying, It is possible to search with a value very close to the actual low tide level. As an exemplary method described above, after fitting the measured water level measured before and after the lowest measured water level with a quadratic polynomial, the tidal level value at the time calculated by the root formula is obtained from the quadratic polynomial, and the polynomial determined as the low tide level (H _L ) Approximation (Polynomial Approximation) method can be applied.

After generating the angular velocity model, which is the tide level model at the closing time, the closing controller 140 repeats the following three operations at intervals of 1 minute in the measurement period like the opening controller 120, and performs the following three operations at intervals of 1 minute. During repetition, when an optimal closing start time that meets the criteria for selecting the start time (a criterion that the preset opening rate must reach 50% at the same water level) is found, the operation is stopped, and the gate 10 is closed according to the optimal closing start time. Controls the sluice gate 10 to start the closing operation.

Descriptions overlapping among the three operations will be briefly described.

As a first operation, the angular velocity model is updated in real time according to the measured tidal level measured in real time, the angular velocity model is used to reduce the prediction error obtained by the difference from the measured tidal level after calculating and predicting the tidal level at the time of measuring the measured tidal level with the angular velocity model. update Even at this time, the angular velocity model may be updated as shown in Equation 8 below having variables a and b increasing or decreasing the amplitude or period.

Since the angular velocity model at this time is a tidal level model of the low tide period having a negative (-) amplitude, it is updated so that the absolute value of the amplitude is adjusted according to the variable a.

Specifically, since it is updated according to the measured tide level before the inflection point appearing while going from low tide level to high tide level, it can be updated as follows. When the measured tide level is greater than the predicted tide level calculated with the angular velocity model 1 minute ago, that is, the angular velocity model before updating, the absolute value of the amplitude is reduced but the period is reduced, and the measured tide level is the predicted tide level calculated with the angular velocity model 1 minute ago. If it is smaller than that, increase the absolute value of the amplitude or increase the period.

As a method of updating the angular velocity model at the time of high tide, a method of increasing or decreasing the amplitude or period by a preset correction value can be adopted only when the tidal level error between the measured tide level and the predicted tide level calculated by the angular velocity model is greater than or equal to the preset error, In addition, a method of increasing or decreasing the period first and then additionally increasing or decreasing the amplitude when the level error does not decrease within the preset error range may be adopted.

As a second operation, after fitting the previous measured tide level with a polynomial, the current tide level is predicted by extrapolation using the polynomial, and calculated as the difference between the current tide level predicted by extrapolation and interpolation using the polynomial and the current measured tide level. get prediction error In addition, when the prediction error obtained by the polynomial is less than the prediction error between the current tide level predicted by the angular velocity model before updating and the current measured tide level, the polynomial is selected as the closed time tide level model, and when the prediction error obtained by the angular velocity model is greater than the prediction error, the angular velocity Select the model as the closing season tide level model. Here, the polynomial may include the polynomials exemplified by Equations 3 to 6 above.

As a third operation, when the tidal level predicted by the tide level model at the closing time and the lake level predicted according to the closing of the water gate 10 are equal, the closing start point at which the preset opening rate is to be set is searched. A method of searching for a closing start point may employ a method of searching for an open start point by reflecting only the difference of closing rather than opening. That is, the time point at which the sluice gate closing operation starts is gradually increased, and the water level and the tidal level after 12 minutes are predicted at each time point, and the optimal closing start time point is selected as the start time point at which the water level is equal.

However, since the closure starts while the seawater is being drained through the open sluice gate, the closure starts in a situation where the lake level is continuously lowered, and the amount of drainage for 12 minutes after the closure starts is relatively much larger than when it was opened, so the lake When forecasting the elevation, it is necessary to reflect and predict the actual lake elevation measured in real time. In other words, as exemplified above, the search time is gradually increased from the present time to 3 minutes after searching for the opening start time that meets the starting time selection criterion, and the gate 10 is opened at each search time point. At this time, the lake level at each search time point, which is gradually increased from the current time point to 3 minutes later, must also be predicted by reflecting the change in drainage on the actual lake level at the current time point. The change in the lake level at this time can be predicted by applying a known technique that calculates the displacement with the floodgate completely open using the water head difference and geographic data.

In this way, the optimal closing time tide level model is selected while updating the angular velocity model according to the actually measured tide level measured at 1-minute intervals, which is the measurement period of the water level observation unit 200, and the starting time point is selected during the 3-minute period of searching for the closing start point. If the optimal closing start time is searched while the operation of searching for the optimal closing start time that meets the criteria is repeated at intervals of 1 minute, the lock (10) is started to close in accordance with the searched optimal closing start time ( 10) to control.

A method for automatically operating a water gate for creative tidal power generation according to an embodiment of the present invention will be described with reference to the flow chart of FIG. 6 .

According to the automatic floodgate operation method of creative tidal power generation according to an embodiment of the present invention, the floodgate 10 ) and start closing the sluice gate 10 at the optimal sluice gate closing time, the opening timing angular velocity model generation step by the opening timing angular velocity model generating unit 110 (S10), the opening control unit 120 The opening control step (S20) by the closing timing angular velocity model generating unit 130 (S30) and the closing control step (S40) by the closing control unit 140 were performed for approximately 12 hours 25 hours. It is performed sequentially for each tide that occurs in the minute tidal cycle.

The overlapping detailed descriptions are summarized and described as follows.

In the opening time angular velocity model generation step (S10), a cos function obtained by fitting the measured tide level obtained prior to the water gate opening time ( _DO ) is generated as an angular velocity model to be used for the water gate opening time ( _DO ). To this end, the water gate opening time After searching for the high tide level (H _H ) that appears before ( _DO ) (S11) and searching for the inflection point that appears after the high tide (S12), the difference between the high tide level (H _H ) and the inflection point tide level is taken as the value of the amplitude A cos function having a period value four times the difference between the inflection point time and the high tide time is generated as an angular velocity model.

When searching for the high tide level, interpolation is applied to the measured tide level obtained at a certain measurement period (1 minute), and when searching for an inflection point, interpolation is applied to the instantaneous change without searching for the minimum instantaneous change among the instantaneous changes in the measured tide level. It is good to apply and explore.

In the opening control step (S20), when the tidal level predicted by the angular velocity model generated in the opening time angular velocity model generation step (S10) and the lake level predicted according to the opening of the water gate 10 are at the same water level, the preset opening rate is set. The opening start time is searched for at the sluice gate opening time (D _O ) during low tide, and the sluice gate 10 is opened.

As a way to adapt the angular velocity model to the changing tide level due to various factors including weather, and to prepare for a case where the error of the angular velocity model is still large, angular velocity to reduce the prediction error of the angular velocity model obtained by using the measured tide level as a comparison value Updating the model (S21), comparing the prediction error calculated according to the predicted tide level at the current time obtained by extrapolation and interpolation after fitting the previously measured tide level with a polynomial model with the prediction error of the angular velocity model (S22), the prediction error A step of selecting a model with relatively little as the open season tide level model (S23), and when the tidal level predicted by the selected open season tide level model and the lake level predicted according to the opening of the water gate 10 are at the same water level, the preset opening rate is set. The step of searching for the opening start point (S24) is repeated every time the measured level is obtained at a measurement period (ΔT _S ) until the opening start point is searched (S25) (S26).

Then, the opening control of the water gate 10 is performed so as to start opening the water gate 10 according to the searched opening start time point (S27).

Here, the predetermined open rate may be a value within the range of 40 to 60%, preferably 50%.

When updating the angular velocity model, after predicting the tide level at the time when the measured tide level was measured using the angular velocity model, a prediction error is obtained by comparing the measured tide level with the measured tide level, and whether to update it can be determined according to the magnitude of the prediction error.

The update method of the angular velocity model may be a method of reducing prediction error by increasing or decreasing the amplitude or period of the angular velocity model, increasing or decreasing the amplitude or period only when a predetermined error occurs, or increasing or decreasing the period first and then reducing the error. A method of additionally increasing or decreasing the amplitude when it does not decrease within a predetermined error range may also be introduced.

As is known, the lake level can be predicted by calculating the change in lake level during the opening of the floodgates using water head difference and geographic data, and then adding or subtracting from the measured lake level.

In the closing time angular velocity model generation step (S30), an angular velocity model is generated by fitting the measured tidal level obtained prior to the sluice gate closing time (D _C ) with a cos function, and for this purpose, the sluice gate closing time (D _C ) The low tide level (H _L ) is searched from the measured tide level measured before the arrival (S31), and the difference between the low tide level and the inflection point tide level is taken as the value of the amplitude, and 4 times the difference between the low tide level time and the inflection point time is the value of the cycle An angular velocity model generated by a cos function having as is generated (S32). The inflection point at this time is the inflection point searched for in the opening phase angular velocity model generation step (S10).

The closing control step (S40) is predicted according to the tide level predicted by the angular velocity model and the closing of the floodgate 10 at the time of closing the floodgate ( _DC ) during the high tide that comes after the measurement point of the actually measured tide level applied to generate the angular velocity model. When the water level is equal to the water level, the water gate 10 is started to close by searching for a closing start point to be set at a preset opening rate.

Here, too, the angular velocity model adapts to the changing tide level due to various factors such as weather, and as a way to prepare for a case where the error of the angular velocity model is still large, the measured tide level is used as a comparison value. To reduce the prediction error of the angular velocity model Updating the angular velocity model (S41), comparing the prediction error calculated according to the predicted tide level at the current time obtained by extrapolation and interpolation after fitting the previously measured tide level with a polynomial model with the prediction error of the angular velocity model (S42), prediction A step of selecting a model with a relatively small error as the tide level model at the closing period (S43), and when the tide level predicted by the selected closing period tide level model and the lake level predicted according to the opening of the water gate 10 are the same water level, the preset opening rate The step of searching for the closing start point (S44) to be performed is repeated every time the measured level is obtained at a measurement period (ΔT _S ) until the closing start point is searched (S45) (S46).

Then, the closing control of the water gate 10 is performed so as to start closing the water gate 10 according to the searched closing start time (S47).

Here, the preset opening rate may be set to a value within the range of 40 to 60%, and is preferably set to 50%.

When updating the angular velocity model, after predicting the tide level at the time when the measured tide level was measured using the angular velocity model, a prediction error is obtained by comparing the measured tide level with the measured tide level, and whether to update it can be determined according to the magnitude of the prediction error.

The update method of the angular velocity model may be a method of reducing the error by increasing or decreasing the amplitude or period of the angular velocity model, increasing or decreasing the amplitude or period only when a predetermined error or more occurs, or increasing or decreasing the period first and then reducing the error A method of additionally increasing or decreasing the amplitude when it does not decrease within a set error may be introduced.

As is known, the lake level can be predicted by applying the measured lake, the lake level change predicted after the actual measurement, and the lake level change predicted during the closing of the floodgate. It can be predicted by way of calculation.

After controlling the sluice gate to be closed, seawater from the open sea flows into the lake at the time of operating the water turbine generator, the lake level rises, and the tide level rises above the high tide level. .

On the other hand, as a modified embodiment of the present invention, the step of updating the angular velocity model in the opening control step (S20) by the opening control unit 120 (S21) and the closing control step (S40) by the closing control unit 140 In step S41 of updating the angular velocity model in Equation 2 and Equation 8, the angular velocity model may be updated according to Equation 9 and Equation 10 below.

According to Equations 9 and 10, the amplitude is increased or decreased by variable a or the angular velocity model is time-shifted by variable c. That is, the time shift is performed by varying the variable c without increasing or decreasing the period. Of course, the variables a and c may also have negative (-) values. Also, by varying the variable c, the origin of the angular velocity model is moved along the time axis. That is, the variable c is variable so as to move the tide level graph based on the angular velocity model to a position where the measured tide level appears.

Specifically, for Equation 9, which is an update formula of the angular velocity model at the time of opening, when the measured tide level is greater than the tide level calculated by the angular velocity model, the variable a or variable c is reduced, and the measured tide level is calculated by the angular velocity model. When it is less than one tidal level, either increase variable a or increase variable c. Regarding Equation 10, which is the update formula of the angular velocity model at the time of closure, when the measured tide level is greater than the tide level to be calculated with the angular velocity model, the variable a is decreased or the variable c is increased, and the measured tide level is less than the tide level calculated by the angular velocity model. Increment the variable a or decrease the variable c.

When the variable c is increased or decreased at this time, it can be increased or decreased only by the preset correction value, and after the variable c is increased or decreased first, when the error does not decrease within the preset error range, the variable a is additionally increased or decreased by the preset correction value. can do.

Here, since the period is not increased or decreased, the variable c for time shifting may be regarded as a variable that changes the phase of the angular velocity model or a variable that changes the perceptual value.

That is, Equations 9 and 10 can be updated to a model that reflects the phase or perception component of each subtide in the tidal level numerical model used for harmonic analysis by applying the variable c.

As another modified embodiment, by using the angular velocity model update equation obtained by including the variable b of Equations 2 and 8 in Equations 9 and 10, the angular velocity is corrected by modifying the period, amplitude, and time shift values. You can also update your model. In this case, after correcting the amplitude and time shift values first, if the error between the measured tide level and the tide level calculated by the angular velocity model does not decrease within the preset error range, the period can be updated by additionally correcting it.

Although the above has been shown and described as specific embodiments to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiments as described above, and various modifications are within the scope of the present invention. can be carried out in Accordingly, such modifications should be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims described below.

10: water gate
100: water gate control unit
110: opening time angular velocity model generation unit 120: opening control unit
130: Closing timing angular velocity model generation unit 140: Closing control unit
200: water level observation unit
210: tide level observation unit 220: lake level observation unit

Claims (16)

In the floodgate automatic operation system of creative tidal power generation, including a water level observation unit 200 that obtains the actual tide level and the actual lake level, and a water gate control unit 100 that controls the water gate 10,
The water gate control unit 100
an opening time angular velocity model generation unit 110 for generating a cos function obtained by fitting the measured tide level obtained prior to the opening time of the floodgate as an angular velocity model to be used at the time of opening the gate;
The process of updating the angular velocity model according to the actually measured tide level at the time of opening the floodgates, and the process of searching for the opening start time to be the preset opening rate when the tide level predicted by the angular velocity model and the lake level predicted according to the opening of the floodgate are equal an opening control unit 120 that controls opening of the water gate 10 at the searched water gate opening time by repeating every time the measured tide level is obtained;
a closing time angular velocity model generating unit 130 for generating a cos function obtained by fitting the measured tide level obtained prior to the closing time of the gate as an angular velocity model to be used at the closing time of the gate;
The process of updating the angular velocity model according to the measured tide level at the time of closure of the sluice gate, and the process of searching for the closure start point to be the preset opening rate when the water level predicted by the angular velocity model and the lake level predicted according to the closure of the sluice gate are equal A closing control unit 140 that repeats every time the measured tide level is obtained and controls the closing of the water gate 10 at the searched water gate closing time point;
Creative tidal power generation water gate automatic operation system including. According to claim 1,
The angular velocity model in the opening period angular velocity model generating unit 110 is
From the measured tide level, the high tide level and the inflection point after the high tide level are searched, and the difference between the high tide level and the inflection point tide level is used as the amplitude value, and a cos function having a period value of 4 times the difference between the inflection point time and the high tide level time is generated.
The angular velocity model generated by the closing period angular velocity model generating unit 130 is
The low tide level is searched from the measured tide level, and the difference between the low tide level and the inflection point tide level is the value of the amplitude, and the cos function having the four times the difference between the low tide level time and the inflection point time as the value of the cycle is generated.
Creative tidal power generation flood gate automatic operation system. According to claim 1,
The preset opening rate in the opening control unit 120 and the preset opening rate in the closing control unit 140 are
preset to a value within the range of 40 to 60%.
Creative tidal power generation flood gate automatic operation system. According to claim 1,
The opening control unit 120 and the closing control unit 140
The angular velocity model is updated to reduce the prediction error between the measured tide level and the predicted tide level at the time of measurement of the actual tide level calculated by the angular velocity model.
Creative tidal power generation flood gate automatic operation system. According to claim 1,
The opening control unit 120 and the closing control unit 140
Updating the angular velocity model to reduce the tidal error by amplitude ramping, period ramping or time shifting
Creative tidal power generation flood gate automatic operation system. According to claim 5,
The opening control unit 120 and the closing control unit 140
Updates the angular velocity model by increasing or decreasing the amplitude, period, or time shift value by the preset correction value when the tidal error exceeds the preset error.
Creative tidal power generation flood gate automatic operation system. According to claim 5,
The opening control unit 120 and the closing control unit 140
Updating the angular velocity model by first increasing or decreasing the period or time shifting and then further increasing or decreasing the amplitude when the tidal error does not decrease within the preset error.
Creative tidal power generation flood gate automatic operation system. According to claim 1,
The opening control unit 120 or closing control unit 140
When the tidal level error obtained by comparing the current measured tide level with the current measured tide level obtained by extrapolation with a polynomial fitting the previous measured tide level is less than the tidal level error of the current tide level obtained from the angular velocity model, the tidal level is predicted by extrapolation and interpolation with a polynomial doing
Creative tidal power generation flood gate automatic operation system. In the floodgate automatic operation method of creative tidal power generation by the floodgate control unit 100 that controls the opening and closing operation of the floodgate 10 according to the measured tide level and the measured lake level obtained by measuring the water level observation unit 200,
An opening time angular velocity model generation step (S10) of generating a cos function obtained by fitting the measured tide level obtained prior to the opening time as an angular velocity model to be used at the opening time of the gate;
The process of updating the angular velocity model according to the actually measured tide level at the time of opening the floodgates, and the process of searching for the opening start time to be the preset opening rate when the tide level predicted by the angular velocity model and the lake level predicted according to the opening of the floodgate are equal An opening control step (S20) of controlling the opening of the water gate 10 at the searched water gate opening time point by repeating every time the measured tide level is obtained;
A closing time angular velocity model generation step (S30) of generating a cos function obtained by fitting the measured tide level obtained prior to the sluice gate closing time as an angular velocity model to be used at the sluice gate closing time;
The process of updating the angular velocity model according to the measured tide level at the time of closure of the sluice gate, and the process of searching for the closure start point to be the preset opening rate when the water level predicted by the angular velocity model and the lake level predicted according to the closure of the sluice gate are equal A closing control step (S40) of controlling the closing of the water gate 10 at the searched water gate closing time point by repeating every time the measured tide level is obtained;
Automatic operation method of floodgates of creative tidal power generation including. According to claim 9,
In the opening period angular velocity model generation step (S10), the angular velocity model is
From the measured tide level, the high tide level and the inflection point after the high tide level are searched, and the difference between the high tide level and the inflection point tide level is used as the amplitude value, and a cos function having a period value of 4 times the difference between the inflection point time and the high tide level time is generated.
The angular velocity model generated in the closing period angular velocity model generation step (S30) is
The low tide level is searched from the measured tide level, and the difference between the low tide level and the inflection point tide level is the value of the amplitude, and the cos function having the four times the difference between the low tide level time and the inflection point time as the value of the cycle is generated.
Automatic operation method of floodgates of creative tidal power generation. According to claim 9,
The preset opening rate in the opening control step (S20) and the preset opening rate in the closing control step (S140)
preset to a value within the range of 40 to 60%.
Automatic operation method of floodgates of creative tidal power generation. According to claim 9,
The opening control step (S20) and the closing control step (S40)
The angular velocity model is updated to reduce the prediction error between the measured tide level and the predicted tide level at the time of measurement of the actual tide level calculated by the angular velocity model.
Automatic operation method of floodgates of creative tidal power generation. According to claim 9,
The opening control step (S20) and the closing control step (S40)
Updating the angular velocity model to reduce the tidal error by amplitude ramping, period ramping or time shifting
Automatic operation method of floodgates of creative tidal power generation. According to claim 9,
The opening control step (S20) and the closing control step (S40)
Updates the angular velocity model by increasing or decreasing the amplitude, period, or time shift value by the preset correction value when the tidal error exceeds the preset error.
Automatic operation method of floodgates of creative tidal power generation. According to claim 13,
The opening control step (S20) and the closing control step (S40)
Updating the angular velocity model by first increasing or decreasing the period or time shifting and then further increasing or decreasing the amplitude when the tidal error does not decrease within the preset error.
Automatic operation method of floodgates of creative tidal power generation. According to claim 9,
The opening control step (S20) or the closing control step (S40)
When the tidal level error obtained by comparing the current measured tide level with the current measured tide level obtained by extrapolation with a polynomial fitting the previous measured tide level is less than the tidal level error of the current tide level obtained from the angular velocity model, the tidal level is predicted by extrapolation and interpolation with a polynomial doing
Automatic operation method of floodgates of creative tidal power generation.

Images