Low Voltage Regulator Power Electronics

The Unified Power Quality Conditioner (UPQC) is an advanced system addressing both voltage and current quality issues in power grids. Integrating series and parallel active filters, it monitors grid voltage and load current in real time, dynamically generating compensation signals to eliminate voltage fluctuations, harmonics, reactive power, and phase imbalances, while enhancing power factor.

The UPQC comprises two components: series voltage-type (UPQC-S) and parallel current-type (UPQC-M), handling grid voltage and current issues separately. The UPQC-S dynamically compensates grid voltage to stabilize it, addressing fluctuations and sags. Meanwhile, the UPQC-M suppresses harmonics and current peaks via dynamic current compensation, improving grid current quality.

The working principle of the voltage type UPQC (UPQC-S)

The device monitors the grid voltage in real time through a voltage sensor, obtaining real-time information about the voltage. Then, the voltage signal is sampled, and processed by the core controller inside the UPQC, generating corresponding compensation information.

The device’s compensation output is inversely transformed to the grid by series UPQC, and compensation signal is injected into the grid through operation, achieving compensation for the grid voltage. The series UPQC improves the stability of the voltage by adjusting the grid voltage to maintain consistency with rated voltage.

The working principle of current-type UPQC (UPQC-M)

The UPQC uses current sensors to monitor grid current in real time. Its controller processes the signal to generate compensation data, which is injected into the grid. The parallel UPQC adjusts the current waveform to suppress harmonics, manage reactive power, and correct imbalances, enhancing grid current quality.

The parallel UPQC and the series UPQC are combined to work, which can achieve comprehensive control and compensation for voltage and current of the power grid. The voltage-type UPQC (UPQC-S) is mainly responsible for dealing with voltage problems, and the current-type UPQC (UPQC-M) is mainly responsible for dealing with current problems. The two work together to achieve comprehensive compensation and management of power quality.