Active power control
The distributed power supply connected to the 10 (6) kV~35 kV power grid should have active power control capabilities. When it is necessary to adjust the output active power and reactive power at the same time, on the premise that the voltage deviation of the grid connection point conforms to the provisions of GB/T 12325, the active power output should be guaranteed first.
For distributed power sources that do not transmit electricity to the public grid, their active power is controlled by the distributed power source operation and management party.
If the distributed power supply connected to the 10 (6) kV-35 kV power grid transmits electricity to the public power grid, it should have the ability to control the change of output active power. Its maximum output power and maximum power change rate should comply with the operation plan approved by the power grid dispatching agency, and at the same time, it should have the ability to execute the instructions of the power grid dispatching agency, and be able to adjust the power by executing the instructions of the power grid dispatching agency. In an emergency, the grid dispatching agency can directly limit the active power delivered by the distributed power source to the public grid.
If the distributed power supply connected to the low-voltage busbar of the 380 V power grid transmits electricity to the public power grid, it should have the ability to accept the power grid dispatching instructions to control the output active power. The distributed power supply connected to the 220V grid can not participate in the active power regulation of the grid.
Reactive voltage regulation
The reactive power and voltage control of distributed power sources should have the functions of supporting constant power factor control, constant reactive power control, and reactive voltage droop control. The distributed power supply connected to the 10 (6) kV~35 kV power grid should have the ability to adjust reactive power and voltage. It can be used to adjust the reactive power of the distributed power supply, adjust the input of reactive power compensation equipment, and adjust the transformation ratio of the power transformer. Its configuration capacity and voltage adjustment method should meet the requirements of NB/T32015.
For the distributed power supply connected to the 380 V power grid, the power factor at the grid connection point should meet the following requirements:
(1) For the distributed power supply connected to the grid in the form of a synchronous generator, the power factor at the grid connection point should be adjustable within the range of 0.95 (leading) to 0.95 (lag);
(2) For the distributed power supply connected to the grid in the form of an induction generator, the power factor at the grid connection point should be adjustable within the range of 0.98 (leading) to 0.98 (lag);
(3) For the distributed power supply connected to the grid via the converter, the power factor at the grid connection point should be adjustable within the range of 0.95 (leading) to 0.95 (lag).
For a distributed power supply connected to a 10(6) kV~35 kV power grid, the power factor and voltage regulation capability at the grid connection point should meet the following requirements:
(1) The distributed power supply connected to the grid in the form of a synchronous generator should have the ability to ensure that the power factor at the grid connection point is continuously adjustable within the range of 0.95 (leading) to 0.95 (lag), and can participate in the voltage regulation of the grid connection point;
(2) The distributed power supply connected to the grid in the form of an induction generator should have the ability to ensure that the power factor at the grid connection point is automatically adjustable within the range of 0.98 (leading) to 0.98 (lag). When there are special requirements, appropriate adjustments can be made to stabilize the voltage level;
(3) The distributed power supply connected to the power grid through the converter should have the ability to ensure that the power factor at the grid connection point is continuously adjustable within the range of 0.98 (leading) to 0.98 (lag). When there are special requirements, appropriate adjustments can be made to stabilize the voltage level. Within its reactive power output range, it should have the ability to adjust reactive power output and participate in grid voltage regulation according to the voltage level of the grid connection point. Parameters such as its adjustment method, reference voltage, and voltage adjustment rate can be set by the grid dispatching agency.
The distributed power supply connected to the 10(6) kV~35 kV user’s internal power grid and not transmitting power to the public power grid should have the function of reactive power control. The distributed power source operation and management party should control the reactive power and grid-connected point voltage according to the principle of reactive power balance and guaranteed voltage qualification rate.
The distributed power supply connected to the 10(6) kV~35 kV user’s internal power grid and transmitting electric energy to the public power grid should have the function of reactive power and voltage control. Distributed power supply controls the power factor and voltage of its grid-connected point under the condition that its reactive power output range and the power factor of the common connection point are limited. At the same time, it is advisable to accept the reactive power instruction of the power grid dispatching agency, and its adjustment mode, reference voltage, voltage adjustment rate, power factor and other parameters shall implement the provisions of the dispatching agreement.
The distributed power supply connected to the 10 (6) kV~35 kV public power grid shall participate in the grid reactive power and voltage regulation within its reactive power output range, and shall have the function of accepting the reactive power and voltage control instructions of the grid dispatching agency. Under the condition that the reactive power output range of the distributed power source and the voltage of the grid connection point are qualified, the grid dispatching agency will control the reactive power and voltage of the distributed power source according to the dispatching agreement.