Generator synchronization parallel operation and voltage regulation integrated control device and system

Abstract

The utility model relates to a kind of generator synchronization parallel operation and voltage regulation integrated control device and system, the device includes: rectifier circuit, its input end connects the output end of synchronous generator set, for receiving the alternating current of synchronous generator set output, rectification obtains direct current;Detection circuit, its input end connects the output end of synchronous generator set and the output end of rectifier circuit, for detecting the electrical property parameter of the alternating current;Voltage regulating circuit, its input end connects the output end of rectifier circuit and the output end of detection circuit, the output end of voltage regulating circuit connects the input end of synchronous generator set, for sending voltage regulating control signal to synchronous generator set;Communication circuit, for the communication between the control device and external controller.The control device of the utility model can automatically throw and connect generator set when load fluctuation, improve the operating efficiency of unit.

Description

Technical Field

[0001] This utility model relates to the field of parallel generator technology, specifically to an integrated control device and system for synchronous parallel operation and voltage regulation of generators. Background Technology

[0002] Synchronous parallel operation of generator sets, also known as parallel operation or parallel connection, refers to an operating mode in which the output power of multiple generator sets is connected in parallel to supply power. In a generator synchronous grid-connected system, a multi-generator parallel controller is used to achieve grid connection. Based on the normal power supply of a single generator set, the controller starts the generator set to be paralleled, automatically tracking the bus voltage and detecting synchronization conditions, ultimately achieving stable parallel connection of multiple generators. Synchronization conditions generally refer to the equal amplitude, consistent frequency, identical phase, and consistent phase sequence of the generator set's terminal voltage and the bus voltage. Meeting synchronization conditions can reduce the impact of the inrush current generated during parallel operation on the entire system.

[0003] Currently used multi-generator parallel controllers have limited functionality, mostly supporting only basic parallel operation and unable to automatically switch generator sets on and off during load fluctuations, resulting in fixed operating efficiency. Furthermore, controller failure can easily trigger a complete power supply system outage. These problems severely impact the reliability and economy of synchronous generator sets.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses an integrated control device and system for synchronous parallel operation and voltage regulation of generators.

[0006] The technical solution adopted in this embodiment of the utility model is as follows: An integrated control device for generator synchronous parallel operation and voltage regulation includes: A rectifier circuit, the input of which is connected to the output of the synchronous generator set, is used to receive the alternating current output by the synchronous generator set and rectify the alternating current to obtain direct current. A detection circuit, the input of which is connected to the output of the synchronous generator set and the output of the rectifier circuit, is used to detect the electrical parameters of the alternating current. A voltage regulating circuit, wherein the input terminal of the voltage regulating circuit is connected to the output terminal of the rectifier circuit and the output terminal of the detection circuit, and the output terminal of the voltage regulating circuit is connected to the input terminal of the synchronous generator set, for sending a voltage regulating control signal to the synchronous generator set; A communication circuit is provided for communication between the control device and an external controller.

[0007] A further technical solution is that the detection circuit includes an MCU, the MCU has a switching signal output terminal, and the control device also includes: The switching circuit has its input terminal connected to the switching signal output terminal of the detection circuit. It is used to receive the switching signal and control the connection or disconnection with the generator set according to the switching signal.

[0008] A further technical solution is that the detection circuit includes voltage amplitude and frequency sampling detection circuits.

[0009] A further technical solution is that the voltage amplitude and frequency sampling and detection circuit includes: a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first capacitor, wherein, The first end of the first resistor serves as the first input terminal of the voltage amplitude and frequency sampling and detection circuit, and the second end is connected to the first end of the third resistor. The second end of the third resistor is connected to the inverting input terminal of the first operational amplifier. The two ends of the sixth resistor are respectively connected to the inverting input terminal and the output terminal of the first operational amplifier. The first end of the second resistor serves as the second input terminal of the voltage amplitude and frequency sampling and detection circuit. The second end of the second resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the non-inverting input terminal of the first operational amplifier. The non-inverting input terminal of the first operational amplifier is connected to the first end of the fifth resistor, and the second end of the second resistor is connected to the voltage VCC. The output of the first operational amplifier is grounded via a seventh resistor and a first capacitor connected in series.

[0010] A further technical solution is that the detection circuit includes a phase difference detection circuit.

[0011] A further technical solution is that the phase difference detection circuit mainly consists of a voltage comparator and a D flip-flop, specifically including: a first voltage comparator, a second voltage comparator, a first D flip-flop, a second D flip-flop, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first diode, a second diode, a third diode, and a fourth diode. The first and second diodes are connected in parallel between the non-inverting and inverting input terminals of the first voltage comparator, which limits the voltage at the non-inverting input terminal within the forward voltage drop of the diodes. The anode of the first diode is connected to the cathode of the second diode, and the cathode of the first diode is connected to the anode of the second diode. The first and second D flip-flops constitute a dual D flip-flop.

[0012] A further technical solution is that the voltage regulation circuit includes a PI voltage regulator.

[0013] A generator grid connection system includes: A busbar, wherein the busbar is provided with a load; The synchronous generator set includes several grid-connected units and units waiting to be connected to the grid. Each grid-connected unit and each unit waiting to be connected to the grid is equipped with a corresponding generator circuit breaker and control device. The control device adopts an integrated control device for synchronous parallel operation and voltage regulation of generators, as described above. Each grid-connected unit and each unit waiting to be connected to the grid is connected to the synchronous generator set through a corresponding generator circuit breaker. The generator circuit breaker is controlled to open or close by a switching signal issued by the corresponding control device.

[0014] The beneficial effects of this utility model embodiment are as follows: The integrated control device for synchronous parallel operation and voltage regulation of generators proposed in this utility model can automatically switch generator sets on and off when the load fluctuates, thereby improving the operating efficiency of the units.

[0015] The generator grid-connected system proposed in this utility model can control the operation of a single generator set or multiple generator sets operating in parallel. When the control device of a single generator set fails, it will not cause the entire power supply system to be interrupted, thus improving the power supply reliability and economy of the generator grid-connected system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the integrated control device for synchronous parallel operation and voltage regulation of generators proposed in Embodiment 1 of this utility model.

[0017] Figure 2 This is a circuit diagram of the voltage amplitude and frequency sampling and detection circuit in Embodiment 2 of this utility model.

[0018] Figure 3 yes Figure 2 A schematic diagram of the voltage waveforms of the circuit's input and output voltages.

[0019] Figure 4 The diagram shown is a circuit diagram of an example of the phase difference detection circuit in Embodiment 3 of this utility model.

[0020] Figure 5 yes Figure 4 A schematic diagram of the DC voltage signal output by the comparator and the DC voltage output by the dual D flip-flops in the circuit.

[0021] Figure 6 The diagram shown is a circuit diagram of a switching circuit example proposed in Embodiment 4 of this utility model.

[0022] Figure 7This is a schematic diagram of the topology of the generator set grid connection system proposed in Embodiment 5 of this utility model.

[0023] In the diagram: R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; U1, First operational amplifier; U2, Second operational amplifier; U3, Third operational amplifier; D1, first diode; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode; Q0, transistor; Q1, first generator circuit breaker; Q2, second generator circuit breaker; Qn, nth generator circuit breaker; K1, relay. Detailed Implementation

[0024] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0026] Example 1 Figure 1 This is a schematic diagram of the integrated control device for synchronous parallel operation and voltage regulation of generators proposed in Embodiment 1 of this utility model. Figure 1 The control device shown is Figure 1 An example of a control device in the example includes: a rectifier circuit, a detection circuit, a voltage regulation circuit, and a communication circuit.

[0027] Specifically, the input terminal of the rectifier circuit is connected to the output terminal of the synchronous generator set to receive the AC power output by the synchronous generator set and rectify the AC power to obtain DC power, which powers the detection circuit and voltage regulation circuit.

[0028] The input terminal of the detection circuit is connected to the output power supply of the synchronous generator set and the output terminal of the rectifier circuit. It is used to detect the electrical parameters of the AC power, including but not limited to voltage amplitude, frequency, phase and excitation current.

[0029] The input terminal of the voltage regulating circuit is connected to the output terminal of the rectifier circuit and the output terminal of the detection circuit. The output terminal of the voltage regulating circuit is connected to the input terminal of the synchronous generator set and is used to send voltage regulation control signals, such as excitation current feedback signals, to the synchronous generator set.

[0030] The communication circuit is used for communication between the control device and an external controller.

[0031] Furthermore, in this embodiment, the detection circuit includes an MCU, the MCU has a switching signal output terminal, and the control device further includes: The switching circuit has its input terminal connected to the switching signal output terminal of the detection circuit. It is used to receive the switching signal and control the connection or disconnection with the generator set according to the switching signal.

[0032] The detection circuit is centered around an MCU and establishes communication with the external control device through communication and voltage regulation circuits. The switching circuit is controlled by the MCU within the detection circuit. Specifically, load fluctuation detection can be implemented through software. The detection circuit collects necessary data and sends it to the MCU, which calculates the system power to determine the load status in real time.

[0033] Example 2 Figure 2 This is a circuit diagram of the voltage amplitude and frequency sampling and detection circuit in Embodiment 2 of this utility model. Figure 2As shown, the voltage amplitude and frequency sampling and detection circuit includes: a first operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a first capacitor C1. The first terminal of the first resistor R1 serves as the first input terminal of the voltage amplitude and frequency sampling and detection circuit. The second terminal of the first resistor R1 is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is connected to the inverting input terminal of the first operational amplifier U1. The two terminals of the sixth resistor R6 are connected to the inverting input terminal and the output terminal of the first operational amplifier U1, respectively. The first terminal of the second resistor R2 serves as the second input terminal of the voltage amplitude and frequency sampling and detection circuit. The second terminal of the second resistor R2 is connected to the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is connected to the non-inverting input terminal of the first operational amplifier U1. The non-inverting input terminal of the first operational amplifier U1 is connected to the first terminal of the fifth resistor R5, and the second terminal of the second resistor R5 is connected to the voltage VCC. The output terminal of the first operational amplifier U1 is grounded via the seventh resistor R7 and the first capacitor C1 connected in series.

[0034] The voltage amplitude and frequency sampling and detection circuit in this embodiment uses a differential amplifier circuit to collect and process the generator terminal voltage, suitable for detecting the 50Hz / 60Hz output of the generator terminal. Since the power frequency voltage is relatively large compared to the voltage suitable for operational amplifier processing, it needs to be divided and then amplified by the operational amplifier to finally obtain a voltage suitable for input to the microcontroller's I / O pins.

[0035] Figure 3 yes Figure 2 The circuit output voltage waveform diagram is shown. The principle for detecting voltage amplitude and frequency is as follows: Phase A voltage is input, and after being divided by the first resistor R1 and the second resistor R2, the node voltages at the inverting and non-inverting inputs of the first comparator U1 are obtained. and The second terminal of the fifth resistor R5 is connected to voltage VCC, which is a bias voltage used to adjust the output voltage of the first comparator U1. It rose above zero.

[0036] Output voltage obtained after acquisition and processing for:

[0037] To facilitate subsequent selection and design calculations, R3=R4 and R5=R6 are designed, then equation (1) simplifies to:

[0038] Input voltage and output voltage waveforms are as follows Figure 3As shown, a low-voltage sine wave with the same frequency and phase as the input voltage is finally obtained. This output voltage is connected to the IO pin of the microcontroller's A / D sampling to convert the analog signal into a digital signal. After processing by the software algorithm, the sampled value of the input voltage is calculated.

[0039] Frequency sampling is also performed using this circuit. The frequency can be calculated using the period measurement method, determining the time difference between the number of zero-crossing points of the voltage setpoint, and then converting it into a frequency value. When the frequency is low, the larger the time difference between the number of zero-crossing points of the voltage setpoint, the more counts the microcontroller's counter will make, resulting in a more accurate measurement. The synchronous generator terminal frequency is typically a low frequency of 50Hz, making the period measurement method effective. This allows for multi-functionality using a simple hardware circuit, reducing product hardware costs.

[0040] Example 3 Figure 4 The diagram shown is a circuit diagram of an example of the phase difference detection circuit in Embodiment 3 of this utility model. Figure 4 As shown, in this embodiment, the phase difference detection circuit mainly consists of a voltage comparator and a D flip-flop, specifically including: a first voltage comparator U2-1, a second voltage comparator U2-2, a first D flip-flop U3-1, a second D flip-flop U3-2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1 and the second diode D2 are connected in parallel between the non-inverting and inverting input terminals of the first voltage comparator U2-1, which limits the voltage at the non-inverting input terminal within the diode's forward voltage drop. The anode of the first diode D1 is connected to the cathode of the second diode D2, and the cathode of the first diode D1 is connected to the anode of the second diode D2. The first D flip-flop U3-1 and the second D flip-flop U3-2 constitute a dual D flip-flop.

[0041] The phase difference detection circuit in this embodiment mainly consists of a voltage comparator and a D flip-flop, with two AC voltage signals. and First, the input voltage is converted into a periodically constant square wave signal by a non-inverting input voltage comparator. Then, these two square wave signals are input to a D flip-flop for XOR logic processing, finally resulting in a square wave signal containing the phase difference information of the two original signals. Specifically, when the input voltage signal at the non-inverting input terminal of the first voltage comparator U2-1 is greater than the forward voltage drop of the first diode D1 during the positive half-wave period, the first diode D1 conducts, clamping the non-inverting input voltage at the forward voltage drop. This voltage is higher than the reference voltage at the inverting input terminal, causing the second voltage comparator U2 to output a high-level signal. Thus, these two parallel diodes set the comparator trigger threshold within the diode's forward voltage drop range, thereby improving the circuit's anti-interference capability. This circuit has a simple structure, low hardware cost, and good practicality and economy.

[0042] Figure 5 yes Figure 4 A schematic diagram showing the DC voltage waveforms output by the comparator and the DC voltage output by the dual D flip-flops in the circuit. (Example:) Figure 5 As shown, line voltage The input, after being current-limited by the eighth resistor R8, is connected to the non-inverting input of the first comparator U2-1. The inverting input of the first comparator U2-1 is grounded, meaning the reference voltage is 0V. The first diode D1 and the second diode D2 are bidirectional limiting diodes. Similarly, when the voltage at the non-inverting input of the second comparator U2-2 is greater than the reference voltage, the output terminal outputs a high-level DC voltage signal. The dual D flip-flop responds to the input DC voltage signal... and Perform an XOR operation to obtain a DC voltage output. .

[0043] DC voltage The microcontroller inputs data and activates its internal timer to measure the duration of high and low voltage levels. Finally, the data is processed by an algorithm to obtain two AC input voltage signals. and Phase difference information.

[0044] Furthermore, the first operational amplifier U1, the first voltage comparator U2-1, and the second voltage comparator U2-2 in the detection circuit can be implemented using an LM339, which contains four independent comparator units.

[0045] Example 4 Figure 6 The diagram shown is a circuit diagram of an example of a switching circuit according to Embodiment 4 of this utility model. Figure 6As shown, the switching circuit includes: a fourteenth resistor R14, a fifteenth resistor R15, a transistor Q0, a fifth diode D5, and a relay K1. The first terminal of the fourteenth resistor R14 serves as the input terminal of the switching circuit, receiving the switching signal sent by the MCU of the detection circuit. The second terminal of the fourteenth resistor R14 is grounded via the fifteenth resistor R15. The second terminal of the fourteenth resistor R14 is connected to the base of the transistor Q0. The emitter of transistor Q0 is grounded, and its source is connected to the anode of the fifth diode D5. The cathode of the fifth diode D5 is connected to the DC voltage VCC. The relay K1 is connected in parallel with the fifth diode D5 and is used to couple with the contactor of the generator set's main circuit. Specifically, the synchronous generator set has a contactor connected to the output terminal of the relay. The switching circuit can detect whether the onboard relay coil is energized or de-energized, thereby controlling the closing or opening of the main circuit contactor, achieving automatic switching of the generator set.

[0046] Example 5 Figure 7 This is a schematic diagram of the topology of the generator set grid connection system proposed in Embodiment 5 of this utility model. Figure 7 As shown, the generator grid-connected system in this embodiment includes: a busbar, a load, several grid-connected generating units, and generating units to be connected to the grid. The busbar is equipped with the load, and each grid-connected and grid-connected generating unit is equipped with a corresponding generator circuit breaker and control device. The control device adopts the integrated generator synchronous operation and voltage regulation control device proposed in Embodiment 1. Each grid-connected and grid-connected generating unit is connected to a synchronous generator set through a corresponding generator circuit breaker. The generator circuit breaker is controlled to open or close by a switching signal issued by the corresponding control device. In this embodiment, each generating unit is connected to the busbar through a generator circuit breaker and corresponding output cables. The control device detects parameters such as voltage, phase, and frequency of the generating unit's output power supply and regulates the voltage of the generating unit's output power supply.

[0047] The generator grid-connected system proposed in this embodiment allows for the parallel operation of generators to maintain system power output and expand total capacity when system capacity is insufficient or when grid-connected generators require maintenance and power supply cannot be interrupted. Conversely, during periods of low load, redundant generators can be removed from the system, thereby improving equipment capacity utilization and reducing operating costs.

[0048] The individual controllers of the grid-connected generator sets collect real-time data on bus voltage, phase, and frequency through detection circuits. The MCU of the control unit calculates this data and determines the conditions for simultaneous parallel operation of multiple generator sets. Subsequently, it outputs PWM signals through the voltage regulation circuit to precisely control the generator terminal voltage output. Simultaneously, the communication circuit synchronizes the processing results to the individual controllers of other generator sets, and each individual controller determines whether to switch generator sets on or off based on this information.

[0049] It should be noted that the phase sequence of the generator sets in the synchronization conditions is generally confirmed and fixed by engineers during the installation phase. Therefore, in actual parallel operation, it is mainly necessary to ensure that the first three conditions are met. Moreover, in practical applications, parallel operation conditions are allowed to be performed within a certain deviation range; this method is called quasi-synchronous parallel operation. Quasi-synchronous parallel operation can significantly reduce the instantaneous inrush current generated during operation, thereby reducing damage to the system and power generation equipment.

[0050] The integrated control device for generator synchronous parallel operation and voltage regulation in this embodiment can control the operation of a single generator set or multiple generator sets in parallel. It is suitable for application scenarios such as distributed energy systems, utility-scale power generation systems and peak load power generation. Compared with traditional control devices, it has greater practical value, is more convenient to operate, and has lower maintenance costs.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An integrated control device for synchronous parallel operation and voltage regulation of generators, characterized in that, include: A rectifier circuit, the input of which is connected to the output of the synchronous generator set, is used to receive the alternating current output by the synchronous generator set and rectify the alternating current to obtain direct current. A detection circuit, the input of which is connected to the output of the synchronous generator set and the output of the rectifier circuit, is used to detect the electrical parameters of the alternating current. A voltage regulating circuit, wherein the input terminal of the voltage regulating circuit is connected to the output terminal of the rectifier circuit and the output terminal of the detection circuit, and the output terminal of the voltage regulating circuit is connected to the input terminal of the synchronous generator set, for sending a voltage regulating control signal to the synchronous generator set; A communication circuit is provided for communication between the control device and an external controller.

2. The integrated control device for generator synchronous parallel operation and voltage regulation as described in claim 1, characterized in that: The detection circuit includes an MCU, which has a switching signal output terminal. The control device also includes: The switching circuit has its input terminal connected to the switching signal output terminal of the detection circuit. It is used to receive the switching signal and control the connection or disconnection with the generator set according to the switching signal.

3. The apparatus for integrated control of parallel operation and voltage regulation of generators as set forth in claim 1, wherein The detection circuit includes voltage amplitude and frequency sampling detection circuits.

4. The apparatus for integrated control of parallel operation and voltage regulation of generators according to claim 3, wherein The voltage amplitude and frequency sampling and detection circuit includes: a first operational amplifier (U1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), and a first capacitor (C1), wherein, The first end of the first resistor (R1) serves as the first input terminal of the voltage amplitude and frequency sampling detection circuit, and the second end is connected to the first end of the third resistor (R3). The second end of the third resistor (R3) is connected to the inverting input terminal of the first operational amplifier (U1). The two ends of the sixth resistor (R6) are respectively connected to the inverting input terminal and the output terminal of the first operational amplifier (U1). The first end of the second resistor (R2) serves as the second input terminal of the voltage amplitude and frequency sampling detection circuit. The second end of the second resistor (R2) is connected to the first end of the fourth resistor (R4), and the second end of the fourth resistor (R4) is connected to the non-inverting input terminal of the first operational amplifier (U1). The non-inverting input terminal of the first operational amplifier (U1) is connected to the first end of the fifth resistor (R5), and the second end of the second resistor (R5) is connected to the voltage VCC. The output of the first operational amplifier (U1) is grounded via a seventh resistor (R7) and a first capacitor (C1) connected in series.

5. The apparatus for integrated control of parallel operation and voltage regulation of generators as set forth in claim 1, wherein The detection circuit includes a phase difference detection circuit.

6. The apparatus for integrated control of parallel operation and voltage regulation of generators according to claim 5, wherein The phase difference detection circuit mainly consists of a voltage comparator and a D flip-flop, specifically including: a first voltage comparator (U2-1), a second voltage comparator (U2-2), a first D flip-flop (U3-1), a second D flip-flop (U3-2), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a first diode (D1), a second diode (D2), a third diode (D3), and a fourth diode (D4). The first diode (D1) and the second diode (D2) are connected in parallel between the non-inverting and inverting input terminals of the first voltage comparator (U2-1), which limits the voltage at the non-inverting input terminal within the forward voltage drop of the diodes. The anode of the first diode (D1) is connected to the cathode of the second diode (D2), and the cathode of the first diode (D1) is connected to the anode of the second diode (D2). The first D flip-flop (U3-1) and the second D flip-flop (U3-2) constitute a dual D flip-flop.

7. The apparatus for integrated control of parallel operation and voltage regulation of generators as set forth in claim 1, wherein The voltage regulation circuit includes a PI voltage regulator.

8. A genset grid tie system, characterized by, include: A busbar, wherein the busbar is provided with a load; A synchronous generator set, comprising several grid-connected units and units awaiting grid connection, each grid-connected unit and unit awaiting grid connection being equipped with a corresponding generator circuit breaker and control device. The control device adopts an integrated control device for synchronous parallel operation and voltage regulation of generators as described in any one of claims 1-7. Each grid-connected unit and unit awaiting grid connection is connected to the synchronous generator set through a corresponding generator circuit breaker, which is controlled to open or close by a switching signal issued by the corresponding control device.

Images