CN-224216865-U - Real-time compensation circuit applied to signal generating device

CN224216865UCN 224216865 UCN224216865 UCN 224216865UCN-224216865-U

Abstract

The utility model provides a real-time compensation circuit applied to a signal generating device, which belongs to the technical field of voltage phase compensation and comprises an operation conditioning circuit, a signal processing unit, an output conditioning circuit and a phase detection circuit, wherein the phase detection circuit compares an alternating voltage signal with a following signal through a comparator to obtain a phase signal, the phase signal is fed back to the signal processing unit, the signal processing unit generates a control signal and feeds back the control signal to the operation conditioning circuit, the operation conditioning circuit comprises a phase compensation circuit and a voltage amplifying circuit, and the phase compensation circuit comprises a plurality of stages of analog switches which are connected in parallel. The phase compensation circuit controls the analog switch to be conducted according to the phase deviation calculated by the signal processing unit, so that different capacitors are connected into the circuit, the phase of the input signal is ensured to be consistent with that of the output signal, and phase compensation is realized.

Inventors

WANG DONG
QIN NING
CAO XIANGYONG

Assignees

山东明科电气技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250428

Claims (10)

1. The real-time compensation circuit is characterized by comprising an operation conditioning circuit, a signal processing unit, an output conditioning circuit and a phase detection circuit, wherein the operation conditioning circuit is connected with the signal processing unit, and the operation conditioning circuit transmits an AC voltage signal subjected to operation conditioning to the signal processing unit; the signal processing unit is connected with the output conditioning circuit, the output conditioning circuit is connected with the phase detection circuit, the signal processing unit outputs a following signal of an alternating voltage signal, the following signal enters the phase detection circuit after being amplified by the output conditioning circuit, the phase detection circuit is connected with the signal processing unit, the phase detection circuit compares the alternating voltage signal with the following signal through the comparator to obtain a phase signal, the phase signal is fed back to the signal processing unit, and the signal processing unit generates a control signal and feeds back to the operation conditioning circuit; The operation conditioning circuit comprises a phase compensation circuit and a voltage amplifying circuit, wherein the phase compensation circuit comprises a plurality of stages of analog switches which are connected in parallel.
2. The real-time compensation circuit according to claim 1, wherein the voltage generated at the output end of the operational amplifier U3A is input into the voltage amplification circuit for amplification, wherein the output end of the operational amplifier U3A in the voltage amplification circuit is connected with one end of a resistor R22, the other end of the resistor R22 is grounded, a resistor R21 is connected between a resistor R18 and the non-inverting input end of the operational amplifier U3B, a capacitor C5 is connected between the non-inverting input end of the operational amplifier U3B and the grounding end of the resistor R22, one end of a resistor R20 is grounded, the other end of the resistor R20 is connected with the inverting input end of the operational amplifier U3B, and a piezoresistor RV3 is connected between the output end of the operational amplifier U3B and the inverting input end of the operational amplifier U3B.
3. A real-time compensation circuit for a signal generating device according to claim 2, wherein the multi-stage analog switch comprises a plurality of inputs and a plurality of outputs, each of the outputs being connected to a resistor and a capacitor to form branches L1, L2, L3, L4.
4. A real-time compensation circuit for a signal generating device according to claim 3, wherein the phase compensation circuit controls the analog switch to be turned on according to the phase deviation calculated by the signal processing unit, so that different capacitors are connected to the circuit.
5. The real-time compensation circuit for the signal generating device according to claim 1, wherein the operation conditioning circuit further comprises a transformer T2, an alternating voltage signal is input to a resistor R19 from an input end VinN+ of the real-time compensation circuit, an output of the resistor R19 is input from an S1 port of the transformer T2 and is output from an S2 port of the transformer T2, an S4 port of the transformer T2 is connected with a negative phase input end of the operational amplifier U3A, an S3 port of the transformer T2 is connected with a positive phase input end of the operational amplifier U3A, the transformer T2 is connected with a diode D3 and a diode D4 in parallel, an S4 port of the transformer T2 is connected with an anode of the diode D3 and a cathode of the diode D4 respectively, an S4 port of the transformer T2 is connected with a cathode of the diode D3 and an anode of the diode D4 respectively, an S4 port of the transformer T2 is grounded, and an S4 port of the transformer T2 is connected with an end of the resistor R18.
6. The real-time compensation circuit for signal generating device according to claim 1, wherein said phase detection circuit comprises a comparator U4A and a comparator U4B, wherein an alternating voltage signal enters the positive input end of said comparator U4A through a resistor R24, the negative input end is grounded, the output end is connected to VDD through a resistor R23, VDD is connected to the positive electrode of a power supply, VSS is grounded; The following signal enters the positive input end of the comparator U4B through a resistor R26, the negative input end is grounded, the output end is connected to VDD through a resistor R25, and the VDD is connected to the positive electrode of the power supply.
7. A real time compensation circuit for a signal generating device according to claim 1, wherein the output of the phase detection circuit is connected to the signal processing unit via an external interrupt.
8. A real-time compensation circuit for a signal generating device according to claim 1, wherein the phase detection circuit comprises a phase signal processing circuit, the phase signal processing circuit being connected to the signal processing unit.
9. A real-time compensation circuit for a signal generating device according to claim 8, wherein the phase signal processing circuit is mainly composed of two comparators U4A and U4B; The comparators U4A and U4B process the alternating voltage signal and the following signal, respectively, and send the processed signals to the signal processing unit.
10. A real-time compensation circuit for a signal generating device according to claim 8, wherein the input of the signal processing unit is connected to the output of the comparator U4A and the output of the comparator U4B, and the signal processing unit is connected to the output of the phase detection circuit via an external interrupt.

Description

Real-time compensation circuit applied to signal generating device Technical Field The utility model belongs to the technical field of voltage phase compensation, and relates to a real-time compensation circuit applied to a signal generating device. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. Along with the increasing proportion of new energy in the power grid in China, the influence of the new energy on the stable operation of the power system is not neglected. Voltage sag or voltage jump is a very easy problem in normal operation of a power plant. This requires that the large-scale power plant for grid-connected operation should have good grid-adaptation capability. The change of the voltage phase angle generated by the signal generating device following the output mode is consistent with the real power grid fault characteristic, and the device can be used for truly simulating the voltage drop and jump characteristics in the power grid fault, so that test and analysis can be carried out on test objects such as an inverter, SVG and the like. However, the signal generating device can cause certain phase deviation in the signal processing process, and cannot be corrected in real time through software. The phase deviation may cause unstable operation of the test object and malfunction of the protection device. Disclosure of utility model The utility model aims to provide a real-time compensation circuit applied to a signal generation device, so as to eliminate the problems caused by phase deviation, ensure the running stability of equipment and improve the safety of a power grid. In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a real-time compensation circuit applied to a signal generating device, which comprises: The device comprises an operation conditioning circuit, a signal processing unit, an output conditioning circuit and a phase detection circuit, wherein the operation conditioning circuit is connected with the signal processing unit, the operation conditioning circuit transmits an alternating voltage signal subjected to operation conditioning to the signal processing unit, the signal processing unit is connected with the output conditioning circuit, the output conditioning circuit is connected with the phase detection circuit, the signal processing unit outputs a following signal of the alternating voltage signal, the following signal enters the phase detection circuit after being amplified by the output conditioning circuit, the phase detection circuit is connected with the signal processing unit, the phase detection circuit compares the alternating voltage signal with the following signal through a comparator to obtain a phase signal, the phase signal is fed back to the signal processing unit, and the signal processing unit generates a control signal and feeds back the control signal to the operation conditioning circuit; The operation conditioning circuit comprises a phase compensation circuit and a voltage amplifying circuit, wherein the phase compensation circuit comprises a plurality of stages of analog switches which are connected in parallel. Further, the voltage generated at the output end of the operational amplifier U3A is input into the voltage amplifying circuit for amplifying, wherein the output end of the operational amplifier U3A in the voltage amplifying circuit is connected with one end of a resistor R22, the other end of the resistor R22 is grounded, a resistor R21 is connected between a resistor R18 and the non-inverting input end of the operational amplifier U3B, a capacitor C5 is connected between the non-inverting input end of the operational amplifier U3B and the grounded end of the resistor R22, one end of a resistor R20 is grounded, the other end of the resistor R20 is connected with the inverting input end of the operational amplifier U3B, and a piezoresistor RV3 is connected between the output end of the operational amplifier U3B and the inverting input end of the operational amplifier U3B. Further, the multi-stage analog switch includes a plurality of input terminals and a plurality of output terminals, each of which is connected with a resistor and a capacitor to form branches L1, L2, L3, L4. Furthermore, the phase compensation circuit controls the analog switch to be conducted according to the phase deviation calculated by the signal processing unit, so that different capacitors are connected into the circuit. Further, the operation conditioning circuit further comprises a transformer T2, an alternating voltage signal is input to a resistor R19 from an input end VinN+ of the real-time compensation circuit, output of the resistor R19 is input from an S1 port of the transformer T2 and output from an S2 port of the transformer T2, an S4 port of the transformer T2 is connected with a ne