KR20200007872A - Hydro Power System Linkage System - Google Patents

Abstract

It is an object of the present invention to provide a hydroelectric power generation system linkage system composed of a plurality of aberration generators that autonomously perform logarithmic control operations in response to changing manual forces without providing a host controller. In order to achieve the above object, power is generated by each inverter using a plurality of configurations including aberrations installed in water pipes, a permanent magnet synchronous generator driven by the aberration, and a power generation controller for generating and controlling the permanent magnet synchronous generator with an inverter. In a hydroelectric power generation system linkage system in which DC power is connected to each other and then reverse current flows into a system through a system linkage device, each power generation controller independently performs power generation control based on the characteristics of each aberration. By setting the start rotation speed and the stop rotation speed of the power generation so as to be different from other aberrations, the logarithmic operation is performed autonomously in response to the change in the quantity of water pipes.

Description

Hydro Power System Linkage System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydroelectric power generation system for recovering unused energy of water, and more particularly, to a hydroelectric power generation system linking system for linking generated electric power to a system.

In general, in a system linkage system in which a power generated by connecting to a grid is reversed in a hydroelectric generation system that recovers phase energy of unused water from an aberration and a generator, a manual force available for generation is possible. It needs to be converted to power as efficiently as possible.

On the other hand, unused water as renewable energy often changes in quantity depending on season, time of day, or the like. For this reason, aberrations are selected in accordance with the maximum quantity obtained at the installation site, but in a small hydroelectric power generation system, aberrations in fixed blades represented by pump inversion aberrations are common. That is, since there is no mechanical function corresponding to the quantity change, such as a variable pitch mechanism or a guide vane, as described, for example, in Patent Document 1, the power generation capacity of the generator driven by aberration is varied in accordance with the change in the manual force. By doing so, a method of maximizing the aberration capability has been proposed.

Japanese Patent Laid-Open No. 2004-364357

Patent Document 1 realizes high-efficiency hydroelectric power generation in a wide flow range and effective dropping range by one aberration, but one aberration has a limit in maintaining high conversion efficiency with respect to a large quantity of water. have. For this reason, after considering a change in the quantity of water, a plurality of aberrations are provided, and an operation control method of switching the number of units to be operated in accordance with the quantity by the flow rate detection device and the host controller can be considered. Patent Document 1 does not consider whether the efficiency is good as a system by controlling a plurality of aberrations.

It is an object of the present invention to target a system-generated power generation system using a plurality of aberrations that reverse current generated by connecting to a system, and aberration power generation considering the characteristics of individual aberrations with respect to the change in manual force available for aberration power generation. A small hydroelectric power generation system linkage system using multiple aberrations that enables the control of a number of units with a minimum device configuration that reduces the host controller that controls the optimum number of operations according to the flow rate detection device and the detected flow rate. To provide.

The present invention has been made in view of the above-described background art and problems, and includes an aberration installed in a water pipe, a permanent magnet synchronous generator driven by the aberration, and a power generation controller configured to control generation of the permanent magnet synchronous generator by an inverter. In a hydroelectric power generation system linkage system which uses a plurality of power supplies to connect DC power generated by each inverter to each other and then reverse currents to a system through a system linkage device, each power generation controller is based on the characteristics of each aberration. The power generation control is independently performed, and the start and stop rotational speeds of the power generation are set so as to be different from other aberrations, so that the logarithmic operation is performed autonomously in response to the change in the quantity of water pipes.

According to the present invention, it is possible to provide a hydroelectric power generation system linkage system by performing autonomous algebraic control of a plurality of aberrations while performing optimal aberration control based on aberration characteristics in response to a change in manual force with respect to aberrations with a simple configuration. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the hydroelectric power generation system linkage system comprised by the some aberration in Example 1. FIG.
2 is a functional block diagram of a power generation controller in the first embodiment.
3 is a characteristic diagram showing power generation control characteristics of the power generation controller in the first embodiment.
4 is a time chart showing the change in manual force and autonomous logarithmic driving control of aberration in Example 1. FIG.
FIG. 5 is a time chart showing autonomous logarithmic driving control of aberration when a system fault occurs in Example 1. FIG.
It is a block diagram of the hydroelectric power generation system linkage system by the several aberrations in Example 2. FIG.
7 is a characteristic diagram illustrating power generation control characteristics of the power generation controller in the second embodiment.
FIG. 8 is a time chart showing autonomous logarithmic driving control at the time of water level variation in Example 2. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described using drawing.

Example 1

1 is a configuration of a hydro power system linkage system according to the present embodiment. 1, in the upper reservoir 9 which is installed in a place with a height in the vertical direction, the water in the Quantity Q ₀ (13) for use in a hydroelectric flows with respect to the aberrations (101, 201, 301) . The aberration flow rate Qp 14 is distributed from the upper reservoir 9 through the water pipe (including water pipe, water pipe, drain pipe, etc.) 1 to Q ₁ , Q ₂ , and Q ₃ by the primary side water branch pipe 31. Then, the water pipes 106, 206, and 306 for each aberration are supplied to the three aberrations 101, 201, and 301, respectively. As a result, water at the aberration flow rate Qp 14 is fed to the aberrations 101, 201, and 301 for use in power generation, and is drained through the secondary water supply branch pipe 32.

The aberration 101 drives the flywheel 107 and the permanent magnet synchronous generator 102. The permanent magnet synchronous generator 102 generates DC power by generating power controlled by the power generation controller 104 by the inverter 103, and supplies power to the grid-connected power conditioner 7 from the DC cable unit 6. . The system-linked power conditioner 7 is a system-linked device that converts DC power into AC power in synchronization with a commercial power source, and reverse currents the system to the system 8. The target DC voltage V _DC ^* is set in each of the power generation controllers 104, 204, and 304, and the characteristic 22 of the aberration shown in FIG. 3 is set such that the DC voltage V _DC of the DC cable section 6 is V _DC ^* . Power generation control based on the above is performed.

On the other hand, since the voltage V _DC of the DC cable part 6 is determined according to the amount of power of the reverse current by the grid-connected power conditioner 7, in the case of the grid-linked system, V _DC is supplied to the grid-linked power conditioner 7. Is controlled. As a result, the DC voltage value of the DC cable part 6 becomes the DC voltage control value V _DC of the grid-connected power conditioner 7. Therefore, in this power generation system, it is in a power generation state when the following relationship is established.

V _DC ^* > V _DC

Similarly with respect to the aberrations 201 and 301, the aberrations 201 and 301 drive the flywheels 207 and 307 and the permanent magnet synchronous generators 202 and 302, respectively.

In general, in the use of hydropower as renewable energy, the quantity used for power generation varies depending on the conditions such as the season. Therefore, the aberration flow rate Qp 14 can be used for the upper reservoir 9 by using the flow rate adjustment valve 10 so that the water level of the reservoir can be checked by a level gauge 11 or the like which detects the level. is greater than the quantity Q ₀ to the water storage tank is busy so as to adjust the aberration flow Qp (14). In addition, the power of the water gauge is supplied by power generation by aberration.

Since the height of the position of the upper reservoir 9 with respect to the aberrations 101, 201, and 301 does not change, the change in the water quantity Qp by the flow regulating valve 10 is a change in the manual force input to the aberration. For this reason, in the system linkage system using the renewable energy, the power generation controllers 104, 204 and 304 always perform the control so that the maximum generation amount is always obtained from the aberration under the condition that the input energy is changed or changed. Specifically, the inverters 103, 203, and 303 are configured such that the power generation controllers 104, 204, and 304 optimize power generation power taken out of the generator based on the aberration power curve 22 in accordance with energy input to the aberration. Control the generated power.

The quantity Q ₁ , Q ₂ , Q ₃ for each aberration differs in the distribution because the pressure loss of the water pipe varies with the amount of power generated by each aberration.

In general, as the rotation speed of the aberration increases, the pressure loss increases, and the pressure loss becomes minimal during the rated operation in which the energy conversion efficiency of the aberration is maximized. For this reason, in aberration power generation, pressure loss changes with power generation control.

The power generation controllers 104, 204, and 304 each perform power generation control based on their own aberration power curves.

2 is a diagram illustrating a functional block of a power generation controller. In FIG. 2, only the power generation controller 104 is described. However, the description is omitted because the power generation controllers 204 and 304 have the same configuration. In FIG. 2, the power generation controller 104 controls the inverter 103 that converts three-phase AC power generated by the permanent magnet synchronous generator 102 into DC power that can be supplied to the system-linked power conditioner 7. . Control of this inverter 103 is performed by the generator control microcomputer 50 which is a microprocessor. The generator control microcomputer 50 includes a current detector 57 that detects a phase current of the permanent magnet synchronous generator 102 from a current sensor 58 that detects the phase current value of the permanent magnet synchronous generator 102, and a position and speed. Estimation calculator 56, PN voltage detector 55 for detecting the output voltage value of inverter 4, generated power command generator 54, voltage command calculator 53, d / q converter ( 52, and a PWM control pulse generator 51 is provided. Since each configuration is known in general inverter control, its detailed description is omitted. The inverter 103 has a semiconductor switching element, and converts the electric power generated by the permanent magnet synchronous generator 102 into a direct current by controlling the semiconductor switching element on / off, while controlling the direct voltage to connect the grid. It converts into direct current power which can be supplied to the power conditioner 7. The generator control microcomputer 50 generates a PWM control signal for on / off control of the semiconductor switching element to control the inverter 103.

In FIG. 3, the aberration power curve mounted in each power generation controller and each set rotation speed of power generation start and power generation stop are shown. In Fig. 3, the aberration-free rotational speed at the maximum quantity of the present system is referred to as N _MAX . For the sake of explanation, the three aberrations have the same performance and the rated output is 3 ㎾.

In FIG. 3, when the power generation controller starts generating power and increases the amount of power generated, the operating point of the aberration moves the aberration power curve 22 on the aberration power curve 22 from right to left from an unrestrained rotational speed.

If the number of power for the aberration of the rated power output P ₀ of each aberration, the number of revolutions is at the rated rotational speed N ₀ power generation output is obtained 3㎾ of 100%.

If the manual force is only 2 kW per aberration, the operating point exceeds N ₀ and moves to the left, balancing when the rotation speed N ₃₂ and the output become 66.6% of P ₃₂ and 2 kW equivalent. Achieve. The power generation controller moves the operating point on the power curve 22 of the aberration in accordance with the increase or decrease of the manual force, thereby controlling to continue the generation while maintaining the optimum operating point of the aberration.

In this embodiment, power generation start and power generation stop rotation speeds are set in each power generation controller so as to obtain an optimum number of driving in parallel operation by three aberrations.

The power generation controllers 104, 204 and 304 are set to different values so as to satisfy the conditions shown below, respectively.

N ₁₀ : Power generation stop rotation speed of aberration 101

If the lowest possible power generation output of the aberration 101 is referred to as P _10, also from the aberration power curve 22 of the three obtains the rotation speed N ₁₀ of the aberration generation termination 101 at the time P _10.

N _1S : Power generation start rotation speed of aberration 101

Rated rotational speed of the aberration and as N ₀ or more, and the aberration-free three rotation restraining numerical value that is less than at the time of the minimum power quantity.

N ₂₁ : Power generation stop rotation speed of aberration 201

If the power generation stop output of the aberration 201, which is an output for stopping one of the two aberrations and switching to one operation, is P ₂₁ ,

P ₂₁ = 100 (n-1) /n=50.0%, n = 2

If two units are used at 1.5㎾ per unit, which is 50% of 3㎾, it is 100% rated operation of 1 to 3㎾. From power aberration curve 22 in Fig. 3, obtain the rotational speed N ₂₁ at the time P ₂₁ and sets the power generation controller (204).

N _2S : power generation start speed of aberration 201

The value of three unrestrained rotational speeds of three aberrations when _N1S or more and _manual force are more than one rating and less than two ratings.

N ₃₂ : Power generation stop rotation speed of aberration 301

If the power generation stop output of the aberration 301, which is an output for stopping one of the three aberrations and switching to two aberrations, is P ₃₂ ,

P ₃₂ = 100 (n-1) /n=66.6%, n = 3

If two units of two to three units are used, which is 66.6% of 3 ㎾, two units are 100% rated operation of two to approximately 3 ㎾. From power aberration curve 22 in Fig. 3, obtain the number N ₃₂ rotate at the time P ₃₂ and sets the power generation controller 304.

N _3S : Power generation start speed of wheel 3

The value of three aberration-free rotational speeds when _N2S or more and a _manual force is more than two ratings of two aberrations, and less than three ratings.

By setting the power generation start and stop rotation speeds of the power generation controllers as described above, logarithmic operation is performed autonomously in accordance with the change of the manual force.

In practical application, there are no limitations on the number of logarithms, and even if the aberration outputs and characteristics are different from each other, power generation outputs before and after the logarithmic conversion are taken into consideration.

In addition, the case where there is no commercial power supply, the case where the power supply of all the apparatus which comprises a system is supplied by the electric power generated by aberration can be considered. In such a case, in the case of a black start in which the power generation system is started from a completely stopped state only by rotation of the aberration, it is necessary to start a control power source other than the power generation controller only by the induced voltage by the rotation of the aberration, At the induced voltage of the driven permanent magnet synchronous generator, the minimum speed necessary to start the control power supply of the inverter is set. In addition, in the case where black start is performed under a condition where the quantity is small, there is a possibility that the uncontrolled rotational speed of each of a plurality of aberrations is insufficient and the start of the control power supply is impossible. In this case, by stopping the water supply of the water pipes other than one aberration with a manual water shutoff valve, the unbounded rotation speed of one aberration for starting can be raised. In the hydroelectric power generation system linkage system composed of a plurality of aberrations of the present embodiment, since the direct current portions are connected to each other, the control power supply for the aberration without water supply is also started at the same time. It is possible to operate the power generation system by closing the above-mentioned index valve after all the aberration control power supplies have been started.

In FIG. 4, the state transition of three aberration power generation with respect to the change of the passive force in a present Example is shown. In Fig. 4, the horizontal axis represents the elapsed time, and the vertical axis represents the rotation speed and power generation output of each aberration from above, and the total manual force P _IN and the total power generation output P _LOAD . As the state before power generation start, the upper reservoir 9 has sufficient water and the flow regulating valve 10 is closed.

At time t ₀ , the flow control valve of the upper reservoir is opened to full open. Manual force is input to three aberrations, and all three speeds increase to the unrestrained speed N _MAX .

When the grid linkage power conditioner initiates grid linkage at t ₁ and starts reverse flow of the generated power, each generation controller increases the amount of power generated by the generator. As a result, torque is applied to the aberration and the rotation speed decreases.

At t ₂ , each aberration becomes 3 kV of the rated output P _0, the rotational speed is N ₀ , and the total output of the three aberrations is 9 kW.

Operate the flow control valve from t ₃ to reduce the manual force to t ₄ by 6 kW.

The primary side due also to the branch pipe draining into equal parts to 31 aberration 3 by, each aberration is, to the number N ₃₂ rotates together with each Sikkim also lowered the output to the operating point moves on the aberration power curve 22 of the three It goes down.

When t ₄ in the rotational speed of the three aberration reached ₃₂ N, the development controller 304 aberrations 301, by stopping the power generation due to a development can stop rotation of the aberration 301 as runaway.

aberrations 301 in the period of t ₄ to t ₅ is the non-bound and the number of revolutions increases. Because of this, the pressure loss of the water pipe 306 increases, so that the manual force is effectively distributed to the two aberrations in operation. While the power generation amount of the aberration 301 becomes zero, the two power generation outputs and the rotation speed of the driving unit increase.

In t ₅ to t ₆ , the total manual force continues the power generation operation with two aberrations for ₆ kW.

In t ₆ to t ₇ , the flow rate is further narrowed by the flow rate adjusting valve to reduce the total manual force P _IN to 3 kPa. The two aberrations narrow the output based on the aberration power curve in accordance with the decrease in the P _IN , and the rotation speed decreases. When the rotational speed of the two aberrations reaches N ₂₁ , the power generation controller 204 of the aberration 201 stops generating power and makes the aberration 201 unrestrained.

In the period t ₇ to t ₈ , the aberration 201 becomes unrestrained and the rotation speed increases. As a result, the pressure loss of the water pipe 206 increases, so that the manual force is effectively distributed to one aberration in operation. While the power generation amount of the aberration 201 becomes zero, the power generation output and the rotation speed of one of the driving units increase. Since the aberrations 201 and 301 are both unrestrained, the rotation speed increases to the same rotation speed.

In t ₈ to t ₉ , the power generation operation is continued with one aberration with respect to a total manual force of 3 kW.

Mask t ₉ again by opening the flow rate adjusting valves of the upper water tank, this can power P _IN of the aberration increases.

During t ₉ to t ₁₀ , even if P _IN increases and exceeds the rated 3 kW of the aberration 101, since the aberration 101 cannot already increase the amount of generation above this at the rated output P ₀ , the rotation speed is N ₀ . Going up in excess. At the same time, the rotation speeds of the aberrations 201 and 301 which are not bound are also increased.

When the number of rotation in the atomizing nozzle aberration two to t ₁₀ reaches N _2S, generation controller 204 of the aberration 201 is so to develop the start frequency to start the power generating operation of the aberration 201.

As the power generation amount of the aberration 201 increases from t ₁₀ to t ₁₁ , and the aberration rotational speed of the aberration 201 decreases, the pressure loss of the water pipe 206 also decreases and Q ₂ increases. Thereby, the rotation speed of another aberration falls. In addition, since P _IN exceeds 3 kPa at the time t ₁₀ , the rotational speed of the aberrations 101 and 201 becomes P ₂₁ or more even if the rotation speed decreases.

If t ₁₁ to increase the power generation amount of the aberration (201), t ₁₁ to t for _12, two in total power generation amount P _LOAD goes increased to follow the P _IN.

According to the above operation, the three aberrations become the logarithmic control operation autonomously in accordance with the increase and decrease of the P _IN , so that the operation can be continued while maintaining the efficiency point of the aberration.

Next, when the manual force at the start of power generation operation is only 50% of the rating, and then increases to the rating thereafter, and the system-linked power conditioner stops the reverse current in an instant due to a system abnormality, and then resumes it. Will be described in FIG. 5.

In Fig. 5, the flow rate regulating valve of the upper reservoir is opened up to 50% at t ₀ to input manual force to the aberration. Since the three aberrations are unrestrained before the power generation operation, the number of revolutions increases at the same time. Because the manual force is only 50%, the speed of unrestrained rises above N _2S to below N _3S .

When the grid-connected power conditioner starts reverse flow at t ₁ , the power generation controllers 104 and 204 start generating operation since the rotation speed of the aberration exceeds N _1S and N _2S . Since the aberration 301 does not reach N 3 _S , the power generation controller 304 does not start generating power.

t ₁ to the power generation amount of the aberration (101 and 201) increase in t ₂ to be rotated is reduced, it goes with the aberrations sense. At this time, the aberration 301 has no power generation amount, so the aberration remains unrestrained rotation speed.

During t ₂ to t _3, P _IN is maintained at 4.5 kW, which is 50%, and the aberrations 101 and 201 maintain power generation of 2.25 kW, which is equivalent to 75%.

By increasing the P _IN from 4.5 kPa to 6.0 kPa again from t ₃ to t ₄ by the flow control valve, the aberrations 101 and 201 simultaneously increase the power generation output to reach 3 kPa, which is equivalent to 100% of the rated P ₀ . It is maintained at P _IN for t ₄ to t ₅ .

Operate the flow control valve again from t ₅ and increase the P _IN to the rated 9㎾.

aberration (101 and 201) at the time of t ₅ is not possible to increase the power generation amount or more because it is in rated output. For this reason, the two aberrations that are driving the development goes to exceed the nominal rotational speed N ₀ is the number of revolutions increases. At the same time, the rotation speed of the aberration 301 in the unrestrained state also increases, and when the power generation controller 304 reaches N _3S at t ₆ , the power generation controller 304 starts the power generation operation.

when t ₆ to t ₇ the power generation amount of the aberration 301 also increases and decreases the number of rotation with the aberration is reduced, the pressure loss of the water pipe 306 is increased Q _3. As a result, the rotation speed of the other aberration in operation also decreases. Since P _IN exceeds 6 kPa at the time t ₇ , the rotation speed of the three aberrations becomes P ₃₂ or more even if the rotation speed of the three aberrations decreases.

t ₇ to t _8, the three aberrations at the same time to go to increase the power output, up from t ₈ t ₉ P _IN maintains a rating of 9㎾ according to P _IN, and the power generation output of the three aberration P _LOAD is also rated Keep it.

If an abnormality occurs in the system at the time t ₉ and the system-linked power conditioner 7 stops the reverse current due to the protective action, the P _load is instantaneously set from 0 kV to 9 kV.

When the system-linked power conditioner 7 stops the reverse current during the aberration power generation operation, the voltage V _DC of the DC cable part 6 in FIG. 1 rapidly rises. Since the power generation controller connected to the DC cable part 6 maintains DC voltage V _DC as a target voltage, respectively, it performs the operation of narrowing the amount of power generation instantaneously so that a sudden rise of voltage may be prevented. As a result, all three aberrations become unrestrained and the speed increases to N _MAX .

While the grid-connected power conditioner 7 is up to t ₁₀ when the reverse current is resumed, the voltage value becomes the target voltage value because each power generation controller controls to maintain the voltage of the DC cable portion at the target voltage, but the reverse current is stopped. As a result, P _LOAD becomes 0 and the standby state is generated with almost zero generation of each aberration.

When the grid-connected power conditioner 7 resumes reverse current due to a system abnormality return at t ₁₀ , since the P _IN is input at the rated voltage and the DC voltage is also maintained at the target voltage, it is possible to recover the generated power soon. .

If each aberration cannot be continuously operated at N _MAX , necessary measures may be taken, such as reducing the manual force of the aberration or providing a means for consuming surplus power separately.

By the above operation, it is possible to cope with the occurrence of a system abnormality during aberration power generation, and to enable the return operation of the power generation amount in a short time.

In addition, when the system power is lost due to a disaster or the like, the independent operation function of the grid-connected power conditioner can be used to continuously supply power to the independent load by maintaining the water tank level in response to changes in the available quantity.

As described above, according to the present embodiment, in response to the change in the manual force for the aberration, without providing a flow rate detection device that can be used for aberration power generation or a high-level controller for controlling the optimal number of driving aberrations based on the detected flow rate. An optimum aberration control based on the characteristic of the aberration can be performed, and a hydroelectric power generation system linkage system by autonomous logarithmic operation control of a plurality of aberrations can be provided.

Example 2

6 is a configuration diagram of a hydroelectric power generation system linkage system by a plurality of aberrations according to the present embodiment. In FIG. 6, the structure of the same function as FIG. 1 attaches | subjects the same code | symbol, and the description is abbreviate | omitted.

In the present embodiment, the water level is controlled only by the generation control of the aberration based on the water level meter output 15 of the water level meter 11 without using the flow control valve 10 to adjust the water level of the upper reservoir according to the change of the available quantity Q ₀ . Power generation control is carried out to maintain. That is, in FIG. 6, three power generation controllers 104, 204, and 304 are input with the level gauge output 15 of the water level gauge 11 of the upper reservoir 9, respectively, based on the value of the level gauge output 15. Limit the generation output.

Hereinafter, a detailed operation will be described with reference to FIGS. 7 and 8 for the simple control of limiting the output in three steps according to the water level.

Since the flow rate is not adjusted, the manual force P _IN for the three aberrations is always constant and will be described below. Strictly, the manual force also changes because the drop changes with the water level change of the reservoir, but the drop is not changed because the influence of the explanation in this embodiment can be ignored. In addition, there is no limit water level is output from at least during the L _H, L and _H to L _M. The output is limited to 70% while the water level is above L _L and below L _M, and the output power is further limited to 30% when below L _L.

7 is a characteristic diagram showing power generation control characteristics of the power generation controller in the present embodiment. In Fig. 7, N ₀ is the generation stop rotation speed, N ₁ is the rotation speed at 30% power generation, N ₂ is the rotation speed at 70% power generation, N ₃ is the rotation speed at rated power generation, N ₄ is no aberration Rotational speed at restraint, P ₁ is aberration output at 30% of manual force, P ₂ is aberration output at 70% of manual force, P ₀ is aberration output at rated power generation, 22 is aberration power curve, 23 is The power curve at the rotation speed N ₂ or more at the 70% power limit, and 24 is the power curve at the rotation speed N ₁ or more at the 30% power limit.

8 is a time chart which shows autonomous logarithmic driving control at the time of water level fluctuation in this embodiment. For explanation, it is assumed that the water level of the upper reservoir 9 is equal to or higher than L _H before the start of the power generation operation, so that the flow rate adjustment valve 10 is closed.

In FIG. 8, the flow regulating valve 10 of the upper reservoir 9 is opened at time t ₀ to make it fully open. When the manual force is input to the three aberrations and the manual force P _IN reaches 9 kW, which is rated, all three speeds increase to the unrestrained speed N _MAX .

When the grid linkage power conditioner 7 starts grid linkage at t ₁ and starts reverse flow of the generated electric power, each generation controller increases the amount of power generated by the generator. As a result, torque is applied to the aberration and the rotation speed decreases.

At t ₂ , each aberration is 3 kΩ with rated output P ₀ , the number of revolutions is N ₀ , and the total output P _LOAD of three aberrations is 9 kΩ. The water level W _L decreases as power generation by aberration is started in the state where the flow rate control valve 10 is fully open.

When t ₃ is below the reservoir level L _M , the three generation controllers limit the generation output to 70%. As a result, the total output P _LOAD of the three aberration generating outputs becomes 6.3 kV. At this time, since the input of the manual force is not limited, the three aberrations increase in rotation speed from N ₀ to N _a . The number of revolutions of the three aberration by being raised to _a N, the pressure loss of the pipes of each aberration increases the quantity Q _P decreases by. If Quantity Q ₀ is unchanged, the decrease in Q _P are in the direction of suppressing the lowering of the upper reservoir water level.

In Figure 8, it continued even during t ₃ to t ₅ to indicate a state in which the lowering of the water level occurs. If the water level continues to fall and the water level W _L of the reservoir reaches L _L at t ₅ , the three power generation controllers further limit the power generation output to 30%. As a result, the total output P _LOAD of the three aberration generating outputs becomes 2.7 kW. At this time, since the input of the manual force is not limited, the three aberrations increase in rotation speed from N _a to N _b . The number of revolutions of the three aberration by being raised to a N _b, the pressure loss of the pipes of each aberration is further raised and quantity Q _P is decreased. If Quantity Q ₀ is unchanged, the decrease in Q _P is in a direction to further suppress a decrease in the upper reservoir water level.

When the aberration flow rate Q _P is present, the fall of the water level W _L of the water tank is suppressed, and when it returns to L _L or more at t ₇ , the power generation controller will return the generation limit to 30% from 70%. Since the aberration is torqued with the increase in the amount of power generation P _LOAD , the rotation speed of the aberration returns from N _b to N _a .

After this, when the available quantity Q ₀ increases and the water level of the reservoir returns to L _M , all the generation controllers release the limit of the generation amount and return to the 100% generation state of the rating.

As described above, by limiting the amount of power generated by each aberration in accordance with the lowering of the water level in the upper reservoir, the rotational speed of the aberration can be consciously increased to increase the pressure loss of the water pipe for each aberration. By increasing the pressure loss of the water pipe for each aberration and limiting the aberration flow rate, the water tank can be restored to the water level.

Since the water level of the upper reservoir is determined by the relationship between the available quantity Q ₀ and the aberration flow rate Q _P , the control enables automatic control of the aberration flow rate corresponding to the change in the available quantity Q ₀ . In other words, even in a situation where the available quantity Q ₀ is changed, continuous system-linked operation of the aberration power generation system is possible without using a flow control valve.

In addition, in the present embodiment, three levels of control are made depending on the water level for the sake of simplicity. However, in actual implementation, the control can be made according to the resolution of the water gauge.

In addition, since each aberration is independently distributed and controlled by each power generation controller, the number of aberrations is not limited to three, but can cope with one to N units, and even if a plurality of aberrations are in operation, the operation of aberrations individually. It is possible to stop, and it is possible to respond to maintenance checks.

As mentioned above, although embodiment was described, this invention is not limited to the above-mentioned embodiment, A various modified example is included. For example, the present invention is not limited to the aberration described in the embodiments, and may be applied to a power generation system using a plurality of generators such as windmills and steam turbines.

In addition, it is not necessarily limited to having all the structures demonstrated. It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is also possible to add, delete, and replace other components with respect to a part of the configuration of each embodiment.

1: water pipe
6: DC cable section
7: Grid Connected Power Conditioner
8: system
9: upper reservoir
10: flow control valve
11: water gauge
107, 207, 307: flywheel
13: Quantity Available Q ₀
14: Aberration Flow Qp
15: water level output
22: Aberration Power Curve
31: Primary water branch
32: secondary water supply branch
101, 201, 301: Aberration
102, 202, 302: permanent magnet synchronous generator
103, 203, 303: inverter
104, 204, 304: power generation controller
106, 206, 306: water pipes per aberration
50: generator control microcomputer

Claims (10)

The DC power generated by each inverter is mutually utilized by using a plurality of configurations comprising an aberration installed in the water pipe, a permanent magnet synchronous generator driven by the aberration, and a power generation controller for generating and controlling the permanent magnet synchronous generator by an inverter. In the hydroelectric system linkage system that is connected to the grid back through the grid linkage device,
Each power generation controller independently performs power generation control based on the characteristics of each aberration, and sets the starting rotation speed and the stopping rotation speed of the power generation so as to be different from the other aberrations, respectively. A hydroelectric system linkage system, characterized by autonomously performing logarithmic operation. The method of claim 1,
Provide a water level meter in the upper reservoir tank for supplying power generation water to the water pipe,
By adjusting the flow rate of the water pipe by the flow control valve based on the detected value of the water level meter, the water level of the upper reservoir tank can be maintained with respect to the change in the available water quantity, and the power generation can be continued. A hydroelectric system linkage system, which performs a logarithmic operation autonomously in response to a change. The method of claim 1,
Provide a water level meter in the upper reservoir tank for supplying power generation water to the water pipe,
Each of the power generation controllers increases the number of revolutions of the aberration by limiting the maximum power generation output based on the detected value of the water gauge, and adjusts the flow rate of the water pipe by using the increase in pressure loss thereby. A hydroelectric system linkage system, characterized by maintaining the level of the upper reservoir against change to enable continued generation. The method of claim 2,
Hydroelectric power system linkage system, characterized in that the power supply of the water gauge is supplied by the power generation by the aberration. The method of claim 3,
Hydroelectric power system linkage system, characterized in that the power supply of the water gauge is supplied by the power generation by the aberration. The method of claim 1,
The power generation system linkage system, characterized in that the power of all the devices constituting the power generation system linkage system is supplied only by the generation of the aberration. The method of claim 2,
The power generation system linkage system, characterized in that the power of all the devices constituting the power generation system linkage system is supplied only by the generation of the aberration. The method of claim 3,
The power generation system linkage system, characterized in that the power of all the devices constituting the power generation system linkage system is supplied only by the generation of the aberration. The method of claim 6,
A hydraulic power source characterized in that it is started only by the induced voltage of the permanent magnet synchronous generator by inputting a passive force against aberration without requiring commercial power supply or external power source for starting the hydroelectric system linkage system. Power generation system linkage system. The method of claim 9,
And when the power supply of the system is lost, the electric power generation system linking system is continuously supplied to the independent load in response to a change in the available quantity by using the standalone operation function of the system linkage device.

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