阅读说明：本技术 水力发电并网系统 (Hydraulic power generation grid-connected system ) 是由 富田敏夫 冈藤启 佐野正浩 于 2018-07-30 设计创作，主要内容包括：本发明的目的是提供一种不设置上级控制器而能够与变化的水动力对应地自主地进行运转台数控制的由多个水轮机发电机构成的水力发电并网系统。为了实现上述目的,提供一种水力发电并网系统,其使用多个包括设置于水管的水轮机、被水轮机驱动的永磁铁式同步发电机和用逆变器对永磁铁式同步发电机进行发电控制的发电控制器的结构,将由各逆变器发电获得的直流电力相互连接后经并网装置反向流向电网,各个发电控制器独立地进行基于各个水轮机的特性的发电控制,并以与其他水轮机不同的方式对各个水轮机设定发电的开始转速和停止转速,来与水管的水量变化相应地自主控制运转的台数。(The invention aims to provide a hydroelectric power generation grid-connected system which is composed of a plurality of water turbine generators and can automatically control the number of running water turbines corresponding to the changing water power without arranging a superior controller. In order to achieve the above object, there is provided a hydroelectric power generation grid-connected system using a plurality of power generation controllers each including a water turbine installed in a water pipe, a permanent magnet synchronous generator driven by the water turbine, and a permanent magnet synchronous generator controlled by an inverter, wherein direct current power generated by each inverter is connected to each other and then reversely flows to a grid through a grid-connected device, and each power generation controller independently performs power generation control based on characteristics of each water turbine, sets a start rotational speed and a stop rotational speed of power generation for each water turbine so as to be different from those of other water turbines, and autonomously controls the number of operating turbines in accordance with a change in water amount of the water pipe.)

1. A hydroelectric power generation grid-connected system in which DC power generated by inverters is connected to each other and then reversely flows to a grid through a grid-connection device, using a plurality of configurations including a water turbine provided in a water pipe, a permanent magnet synchronous generator driven by the water turbine, and a power generation controller that controls power generation of the permanent magnet synchronous generator using the inverters, the hydroelectric power generation grid-connected system being characterized in that:

each of the power generation controllers independently performs power generation control based on the characteristics of each of the water turbines, sets a start rotational speed and a stop rotational speed of power generation for each of the water turbines differently from the other water turbines, and autonomously controls the number of the turbines to be operated according to a change in the water volume of the water pipe.

2. The hydraulic power grid-connected system according to claim 1, wherein:

a water level meter is arranged on an upper water storage tank which provides power generation water for the water pipe,

the flow rate of the water pipe is adjusted by the flow rate adjusting valve based on the detection value of the water level gauge, so that the water level of the upper water storage tank can be kept and power generation can be continuously performed even when the available water amount changes, and the number of the water pipes is automatically controlled according to the water amount change.

3. The hydraulic power grid-connected system according to claim 1, wherein:

a water level meter is arranged on an upper water storage tank which provides power generation water for the water pipe,

each of the power generation controllers limits the maximum power generation output based on the detection value of the water level gauge so that the rotation speed of the water turbine is increased, and adjusts the flow rate of the water pipe by using the increase in pressure loss caused thereby, so that the water level of the upper reservoir can be maintained even when the available water amount changes, and power generation can be continued.

4. The hydraulic power grid-connected system according to claim 2, wherein:

the power supply of the water level gauge is provided by the power generation of the water turbine.

5. The hydraulic power grid-connected system according to claim 3, wherein:

the power supply of the water level gauge is provided by the power generation of the water turbine.

6. The hydraulic power grid-connected system according to claim 1, wherein:

the power supply of all the equipment forming the hydraulic power generation grid-connected system is only provided by the water turbine for generating power.

7. The hydraulic power grid-connected system according to claim 2, wherein:

the power supply of all the equipment forming the hydraulic power generation grid-connected system is only provided by the water turbine for generating power.

8. The hydraulic power grid-connected system according to claim 3, wherein:

the power supply of all the equipment forming the hydraulic power generation grid-connected system is only provided by the water turbine for generating power.

9. The hydraulic power grid-connected system according to claim 6, wherein:

when the hydroelectric power generation grid-connected system is started, a power frequency power supply and an external power supply are not needed, and the system is started only by utilizing the induced voltage of the permanent magnet synchronous generator generated by the input of hydrodynamic force to the water turbine.

10. The hydraulic power grid-connected system according to claim 9, wherein:

when the power supply of the system is lost, the autonomous load is continuously supplied with power even when the amount of available water changes, using the autonomous operation function of the grid-connected device.

Technical Field

The present invention relates to a hydroelectric power generation system for recovering unused energy of water, and more particularly to a hydroelectric power generation grid-connected system for transmitting electric power obtained by power generation to a power grid.

Background

Disclosure of Invention

Technical problem to be solved by the invention

Patent document 1 realizes high-efficiency hydroelectric power generation in a wide flow rate range and an effective drop range with one hydraulic turbine, but it is difficult to maintain high conversion efficiency with respect to a greatly varying water amount when one hydraulic turbine is used. For this reason, although an operation control method can be considered in which a plurality of water turbines are provided in consideration of a change in the water amount, and the number of the water turbines to be operated is switched according to the water amount by using the flow rate detection device and the host controller, patent document 1 does not consider how to control the plurality of water turbines so as to improve the efficiency of the system.

The present invention provides a small-scale hydroelectric power generation grid-connected system including a plurality of water turbines connected to a power grid and configured to reversely feed electric power obtained by power generation, wherein the small-scale hydroelectric power generation grid-connected system includes a plurality of water turbines, performs water turbine power generation control in consideration of characteristics of the respective water turbines with respect to changes in hydrodynamic force available for water turbine power generation, reduces a flow rate detection device and a superior controller for controlling the most appropriate number of operating units based on a detected flow rate, and has the simplest equipment configuration.

Technical solution for solving technical problem

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a hydroelectric power generation grid-connected system in which, for example, a plurality of power generation controllers each including a water turbine installed in a water pipe, a permanent magnet synchronous generator driven by the water turbine, and a power generation controller for controlling power generation of the permanent magnet synchronous generator by an inverter are used, and direct current powers generated by the inverters are connected to each other and then reversely flow to a grid through a grid-connected device, wherein each of the power generation controllers independently performs power generation control based on characteristics of each of the water turbines, and sets a start rotational speed and a stop rotational speed of power generation for each of the water turbines differently from those of the other water turbines, thereby autonomously controlling the number of the power generation machines to operate in accordance with.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a hydraulic power generation grid connection system (hydraulic power generation system connection system システ ム) which has a simple structure, performs optimal turbine control based on the characteristics of the hydraulic turbine in response to a change in the hydraulic power supplied to the hydraulic turbine, and performs autonomous operation number control of a plurality of hydraulic turbines.

Drawings

Fig. 1 is a configuration diagram of a hydraulic power grid system including a plurality of water turbines in embodiment 1.

Fig. 2 is a functional block diagram of the power generation controller in embodiment 1.

Fig. 3 is a characteristic diagram showing the power generation control characteristics of the power generation controller in example 1.

Fig. 4 is a time chart showing the change in hydrodynamic force and the number of operating hydraulic turbines that are autonomously controlled in embodiment 1.

Fig. 5 is a timing chart showing the number of hydraulic turbines autonomously controlled to operate in the event of a system abnormality in embodiment 1.

Fig. 6 is a configuration diagram of a hydraulic power generation grid-connected system including a plurality of water turbines in embodiment 2.

Fig. 7 is a characteristic diagram showing the power generation control characteristics of the power generation controller in example 2.

Fig. 8 is a timing chart showing the number of autonomously controlled operation stages at the time of water level fluctuation in embodiment 2.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.