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首页> 外文会议>Transient phenomena in large electric power systems >System Studies of Voltage Drops Caused by Energising MV Wind Turbine Transformers
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System Studies of Voltage Drops Caused by Energising MV Wind Turbine Transformers

机译：MV风力涡轮机变压器通电引起的电压降的系统研究

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A typical wind farm consists of several, maybe tens of wind turbines, each operating at or less than 1.0 kV and connected to the MV connection system via a turbine transformer. The MV connection system can be directly connected to a local grid system or via a step up substation transformer if the wind farm is fairly large. When the turbine transformers are energised, the grid system will see a transient phenomenon called "inrush current" and voltage drops/fluctuations on the local grid system will result. Severe voltage drops can cause fluctuations of certain types of lights resulting in customer complaints. Thus, the voltage fluctuation at the point of common coupling (POC) may be restricted, e.g. to within 3% as recommended in the British Engineering Recommendation P28.rnSystem studies of voltage drops caused by energisation of turbine transformers for four proposed wind farms have been undertaken using PSCAD software. Site measurement data was obtained for one of the four sites for verification purposes. The wind turbines of one wind farm operate at 1.0 kV and are connected to a 33 kV wind farm connection system via 1.0/33 kV turbine transformers. The wind farm connection system is connected to a 132 kV grid system via a step up 33/132 kV substation transformer. The wind turbines of the other three wind farms operate at 690 V and are connected to 33 kV connection systems via 0.69/33 kV turbine transformers. The 33 kV collection systems within the wind farms are connected directly to the DNO's 33 kV distribution systems.rnThe study results show: the higher the inrush magnitude the higher the voltage drops; the voltage drop decreases when the number of turbine transformers energised simultaneously is reduced; the maximum voltage drop seen by the local grid system is 9.2 %. High voltage drops can be reduced by two different methods; stagger energising of transformers or add a pre-insertion resistor (PIR). Both methods can reduce voltage drops to within the required limit and are recommended for the projects.
机译：典型的风电场由几台，也许是数十台风力涡轮机组成，每台风力涡轮机的运行电压均小于或等于1.0 kV，并通过涡轮变压器连接到MV连接系统。 MV连接系统可以直接连接到本地电网系统，或者如果风电场相当大，则可以通过升压变电站变压器连接。当涡轮变压器通电时，电网系统将出现一个瞬态现象，称为“浪涌电流”，并且将导致本地电网系统上的电压降/波动。严重的电压降会导致某些类型的灯的波动，从而导致客户投诉。因此，可以限制例如公共耦合点（POC）处的电压波动。使用PSCAD软件已对英国四个工程建议的风电场的涡轮变压器通电引起的电压降进行了系统研究，该误差在英国工程建议P28.rn中建议的3％以内。出于验证目的，获取了四个站点之一的站点测量数据。一个风电场的风力涡轮机以1.0 kV的电压运行，并通过1.0 / 33 kV涡轮变压器连接到33 kV的风电场连接系统。风场连接系统通过升压33/132 kV变电站变压器连接到132 kV电网系统。其他三个风电场的风力涡轮机在690 V电压下运行，并通过0.69 / 33 kV涡轮变压器连接到33 kV连接系统。风电场内的33 kV采集系统直接与DNO的33 kV配电系统相连。研究结果表明：涌入量越大，电压降越大；当同时给涡轮变压器供电时，电压降减小。本地电网系统看到的最大电压降为9.2％。高压降可以通过两种不同的方法来降低：错开变压器的通电或添加预插入电阻器（PIR）。两种方法都可以将电压降降低到要求的限制内，因此建议在项目中使用。

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