Cooling system and wind power generator set

A cooling system, comprising:

• a first cooling circuit for cooling a first heat source, a second cooling circuit for cooling a second heat source, a third cooling circuit for cooling a third heat source, a fourth cooling circuit for cooling a fourth heat source, a pump station unit and a heat dissipation unit;
• wherein the pump station unit comprises a pump group, a water distributor and a water collector, a main water supply pipe is arranged between the pump group and the water distributor, and a main water return pipe is arranged between the pump group and the water collector;
• the pump group provides a cooling medium for the first cooling circuit, the second cooling circuit, the third cooling circuit and the fourth cooling circuit via the water distributor;
• the first cooling circuit is directly communicated with the water distributor and the water collector, and the second cooling circuit, the third cooling circuit, and the fourth cooling circuit are respectively connected to the water collector via the heat dissipation unit;
• wherein the cooling system further comprises a heat exchanger via which the second cooling circuit and the third cooling circuit are thermally coupled with each other;
• wherein the third cooling circuit comprises a bypass;
• when a temperature of the second heat source is lower than a preset temperature, the cooling medium flows into the heat exchanger via the bypass of the third cooling circuit, to exchange heat with the cooling medium flowing into the second cooling circuit;
• wherein the heat exchanger comprises a first heat conduction channel and a second heat conduction channel spaced apart from each other;
• the first heat conduction channel comprises a first inlet end and a first outlet end, and the second heat conduction channel comprises a second inlet end and a second outlet end;
• a second water supply pipe of the second cooling circuit comprises a first section and a second section, the first section is connected to the first inlet end at its downstream, and the second section is connected to the first outlet end at its upstream;
• a water supply bypass pipe of the bypass is connected to the second inlet end, and a water return bypass pipe of the bypass is connected to the second outlet end.