Abstract: A backup voltage and frequency support method for a 100%-renewable energy sending-end grid, including: (S1) selecting a plurality of support nodes in the 100%-renewable energy sending-end grid; (S2) mounting a backup voltage and frequency support device at each support node; and (S3) dynamically adjusting an active power output of a renewable energy station of the 100%-renewable energy sending-end grid according to a frequency of a grid-connection point.

Abstract: A backup voltage and frequency support method for a 100%-renewable energy sending-end grid, including: (S1) selecting a plurality of support nodes in the 100%-renewable energy sending-end grid; (S2) mounting a backup voltage and frequency support device at each support node; and (S3) dynamically adjusting an active power output of a renewable energy station of the 100%-renewable energy sending-end grid according to a frequency of a grid-connection point.

Abstract: A distributed voltage clamping method for a 100% renewable-energy sending-end grid, including: selecting key nodes from the 100% renewable-energy sending-end grid, including their voltage levels and positions; installing a dynamic reactive power compensation device on each key node, where the dynamic reactive power compensation device is controlled by a constant alternating-current (AC) voltage effective value, and the instruction value of the constant AC voltage effective value is adjustable according to an operation mode; according to AC voltage variation of the sending-end grid under a typical working condition, judging whether the key nodes meet the checking requirements; if not, selecting more key nodes.