JP2018102105A5

JP2018102105A5 -

Info

Publication number: JP2018102105A5
Application number: JP2016248589A
Authority: JP
Filing date: 2016-12-22
Publication date: 2019-10-31
Anticipated expiration: 2036-12-22

Description

前記目的を達成するため、本発明の自然エネルギー発電システムは、自然エネルギーを受けて発電する発電装置と、前記発電装置及び電力系統に電気的に接続される電力変換器と、前記電力変換器と前記電力系統の間に配置される連系変圧器と、前記電力変換器が出力する無効電力指令を生成する無効電力コントローラを備え、前記無効電力コントローラは、前記電力変換器と前記電力系統の間に配置される前記連系変圧器のリアクタンスと、前記電力変換器が出力する電流または有効電力の少なくともいずれかを用いて、前記電力変換器と前記電力系統との連系点電圧における有効電力による変動成分及び前記連系点電圧における無効電力による変動成分の和が略一定になる様に、前記無効電力指令を決定する無効電力指令決定部を備えることを特徴とする。 In order to achieve the object, a natural energy power generation system of the present invention includes a power generation device that generates power by receiving natural energy, a power converter electrically connected to the power generation device and a power system, and the power converter. An interconnection transformer disposed between the power grids, and a reactive power controller that generates a reactive power command output from the power converter, the reactive power controller between the power converter and the power grid. By using the reactance of the interconnection transformer disposed in the at least one of the current output from the power converter or the active power, the active power at the interconnection point voltage between the power converter and the power system as the sum of the variation component due to the reactive power in the variation component and the connecting point voltage becomes substantially constant, and a reactive power command determination unit configured to determine the reactive power command And wherein the door.

また、本発明に係る無効電力コントローラは、自然エネルギーを受けて発電する発電装置及び電力系統に電気的に接続される電力変換器と前記電力系統との連系点電圧における有効電力による変動成分及び前記連系点電圧における無効電力による変動成分の和が略一定になる様に、前記電力変換器が出力する無効電力指令を生成する演算装置と、前記電力変換器と前記電力系統の間に配置される前記連系変圧器のリアクタンスと、前記電力変換器が出力する電流または有効電力の少なくともいずれかを用いて、前記無効電力指令を決定する無効電力指令決定部と、を備えることを特徴とする。 Further, the reactive power controller according to the present invention includes a power generation device that receives natural energy to generate power, a power converter that is electrically connected to the power system, and a fluctuation component due to active power in a connection point voltage between the power system and Arranged between the power converter and the power system, an arithmetic device that generates a reactive power command output by the power converter, so that the sum of fluctuation components due to reactive power at the interconnection point voltage is substantially constant And a reactive power command determining unit that determines the reactive power command using at least one of a reactance of the interconnection transformer and a current or active power output from the power converter. To do.

さらに、本発明に係る自然エネルギー発電システムの制御方法は、自然エネルギーを受けて発電する発電装置と、前記発電装置及び電力系統に電気的に接続される電力変換器と、前記電力変換器と前記電力系統の間に配置される連系変圧器と、前記電力変換器が出力する無効電力指令を生成する無効電力コントローラを備える自然エネルギー発電システムの制御方法であって、前記電力変換器と前記電力系統の間に配置される前記連系変圧器のリアクタンスと、前記電力変換器が出力する電流または有効電力の少なくともいずれかを用いて、前記電力変換器と前記電力系統との連系点電圧における有効電力による変動成分及び前記連系点電圧における無効電力による変動成分の和が略一定になる様に、前記無効電力指令を決定することを特徴とする。
Furthermore, the control method of the natural energy power generation system according to the present invention includes a power generation device that generates power by receiving natural energy, a power converter that is electrically connected to the power generation device and a power system, the power converter, and the A method for controlling a natural energy power generation system, comprising: an interconnected transformer disposed between power systems; and a reactive power controller that generates a reactive power command output from the power converter , wherein the power converter and the power Using the reactance of the interconnection transformer arranged between the grids and at least one of the current output from the power converter or the active power, the connection point voltage between the power converter and the power grid is The reactive power command is determined so that a sum of a fluctuation component due to active power and a fluctuation component due to reactive power at the interconnection point voltage becomes substantially constant. And

Claims

A power generation device that receives natural energy to generate electricity;
A power converter electrically connected to the power generator and the power system;
An interconnection transformer disposed between the power converter and the power system;
A reactive power controller that generates a reactive power command output by the power converter;
The reactive power controller is:
Using the reactance of the interconnection transformer arranged between the power converter and the power system and at least one of the current or the active power output from the power converter, the power converter and the power system A reactive power command determination unit that determines the reactive power command so that a sum of a fluctuation component due to active power at the interconnection point voltage and a fluctuation component due to reactive power at the interconnection point voltage becomes substantially constant. Natural energy power generation system

The natural energy power generation system according to claim 1 ,
The reactive power controller is:
Further, the reactive power command is determined by using an impedance ratio between the power converter and the interconnection line of the power system.

The natural energy power generation system according to claim 2 ,
From the active power, the reactance, and the impedance ratio, a control table creating unit that creates a control table in which at least one of the current or the active power is associated with a reactive power command value;
A control table storage unit for storing the control table;
The reactive power command determination unit determines a reactive power command value by using the control table and at least one of the current and the active power.

The natural energy power generation system according to claim 2 or 3 ,
A plurality of power generators, a plurality of power converters, and a plurality of interconnected transformers,
The reactive power controller is:
A power collection configuration table storage unit for storing a table showing a current collection configuration of the interconnection transformer and the power converter;
The reactive power command determined tough at least either of the current or the active power, and the reactance of the interconnection transformer, the impedance ratio of the interconnection line, the reactive power command value by using the current collector configuration table Renewable energy generation system characterized by determining

The natural energy power generation system according to claim 4 ,
The reactive power controller is:
From the maximum apparent power of the power converter and the active power, a reactive power output possible amount of the power converter is calculated, and a plurality of the powers so that the reactive power command value is equal to or less than the reactive power output possible amount. A renewable energy power generation system comprising a reactive power output distribution determining unit that determines a distribution of reactive power command values in a converter

A natural energy power generation system according to any one of claims 1 to 5,
The reactive power controller is:
Means for obtaining at least one of a predicted current value or a predicted active power value of the power converter;
The reactive power command determined tough from the current estimated value or the active power prediction value, determining a reactive power command values for a plurality time section,
Natural energy power generation system characterized by

A natural energy power generation system according to any one of claims 1 to 6 ,
A natural energy power generation system, wherein the power generation device is a wind power generation device

A natural energy power generation system according to any one of claims 1 to 6 ,
Natural power generation system characterized in that the power generation device is a solar power generation device

Fluctuation component due to active power in a connection point voltage between the power system and a power converter electrically connected to the power system receiving natural energy and the power system, and a fluctuation component due to reactive power in the connection point voltage So that the sum of the power converter is substantially constant, an arithmetic device that generates a reactive power command output by the power converter, and reactance of the interconnection transformer disposed between the power converter and the power system, A reactive power command determination unit that determines the reactive power command using at least one of a current or active power output by the power converter;
Reactive power controller characterized by comprising

A power generation device that receives natural energy to generate electricity;
A power converter electrically connected to the power generator and the power system;
An interconnection transformer disposed between the power converter and the power system;
A control method of a natural energy power generation system including a reactive power controller that generates a reactive power command output by the power converter,
Using the reactance of the interconnection transformer arranged between the power converter and the power system and at least one of the current or the active power output from the power converter, the power converter and the power system The reactive power command is determined such that the sum of the fluctuation component due to active power at the interconnection point voltage and the fluctuation component due to reactive power at the interconnection point voltage is substantially constant. Control method