Research On LED Lamp Participating In Frequency Regulation Of Microgrid Based On Unreliable Local Communication

Microgrid plays an important role in realizing that distributed generation connects to the power system safely and friendly. When microgrid operates in island mode, it needs to maintain power balance depending on the micro source. Due to the power output fluctuation of renewable energy such as wind and solar generator, it will lead to frequency fluctuation of micro grid. LED lamp has the advantages of huge potential capacity, nonlinear relationship between electric power and luminous flu, and fast speed of power adjustment, therefore, LED lamp participates in frequency modulation of microgrid as controllable load is technical feasible, and it has theoretical value.The adjustable power for single LED lamp is very weak comparing to capacity of microgrid. LED lamp participating in frequency modulation of micro grid is achieved by controlling power of a large number of LED lamps. In order to acquire the signal accurately, a distributed signal acquisition approach is proposed based on unreliable communication with communication delay and noise. Signal measuring devices are performed only at distribution substations, and local communication between neighbors can facilitate consistent and accurate acquisition of signals for all LED lamps. Through SIMULINK simulation experiment, it verifies that the method can filter high frequency noise. In addition, when communication delay is less than a certain value, all LED lamps can achieve consistency and robust of control signal. The distributed signal acquisition can greatly reduce the investment cost of signal measurement and communication. And it makes it economic feasible for LED lamps participating in frequency modulation.Further according to the principle of LED lamp driven circuit, and take into consideration of the non-linear relationship between flux and power, a dynamic model of power adjusting with frequency is designed. Integrating with distributed acquisition approach, a microgrid frequency control method is proposed with consideration of LED lamps. Through simulation,it verifies that LED lamps involved in microgrid frequency modulation reduce the range of frequency fluctuation. Besides, they shorten the recovery time of microgrid frequency.In order to realize LED lamps participate in microgrid frequency modulation, it is urgent to overcome the problems of control signal acquisition and LED lamps participating in microgrid frequency modulation. Therefore, the paper researches on distributed signal acquisition and frequency control method with LED lamps, which make LED lamps have thecharacteristics to participating in microgrid frequency modulation. LED lamps participating in microgrid frequency modulation will balance the intermittence of renewable energy generators output, and it will improve absorptive capacity of microgrid for renewable energy.