CN107612443B - Power generation control circuit and power generation system - Google Patents

Abstract

The power generation control circuit and power generation system provided by the present invention relate to the technical field of power generation control. Among them, the power generation control circuit is applied to the power generation system. The power generation system includes a generator and a bus, and the power generation control circuit includes a voltage regulator, an incoming line circuit breaker, a current detection circuit and a voltage detection circuit. The generator and the bus are connected through the incoming line circuit breaker, the current detection circuit is arranged on the generator and the output end is connected to the input end of the voltage regulator, the input end of the voltage detection circuit is connected to the output end of the generator, the output end is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the excitation winding of the generator. Through the above arrangement, the problem of the incoming line circuit breaker closing when the generator output voltage and the bus voltage do not match can be solved, thereby solving the problem of the generator burning due to the mismatch when closing.

Description

Power generation control circuit and power generation system

Technical Field

The present invention relates to the technical field of power generation control, and in particular to a power generation control circuit and a power generation system.

Background Art

With the continuous improvement of power generation technology and control technology, the control process of power generation has been increasingly optimized, which has greatly broadened the application scope of power generation control technology. Among them, when the generator is connected to the bus, the power generation control circuit is used to avoid the problem of grid connection failure caused by the mismatch between the motor output voltage and the bus voltage.

The inventors have discovered that in existing power generation control circuits, due to the low accuracy of voltage regulation, a high-voltage surge current is easily generated between the generator and the bus due to the closing of the incoming circuit breaker when the generator output voltage and the bus voltage do not match, and the generator is then burned out due to the high-voltage surge current entering the generator.

Summary of the invention

In view of this, the object of the present invention is to provide a power generation control circuit and a power generation system to solve the problem of the incoming circuit breaker closing when the generator output voltage and the bus voltage do not match, and further solve the problem of the generator burning due to the mismatch when closing.

To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

A power generation control circuit is applied to a power generation system. The power generation system comprises a generator and a busbar, and the power generation control circuit comprises a voltage regulator, an incoming line circuit breaker, a current detection circuit and a voltage detection circuit.

The generator and the bus are connected via the incoming circuit breaker, the current detection circuit is arranged on the generator and the output end is connected to the input end of the voltage regulator, the input end of the voltage detection circuit is connected to the output end of the generator and the output end is connected to the input end of the voltage regulator, and the output end of the voltage regulator is connected to the excitation winding of the generator.

The current detection circuit detects the current value at the output end of the generator and sends it to the voltage regulator. The voltage detection circuit detects the voltage value at the output end of the generator and sends it to the voltage regulator. The voltage regulator controls the working current of the excitation winding according to the received current value and voltage value to control the output voltage of the generator. When the output voltage reaches the bus voltage value, the incoming circuit breaker is controlled to close so that the output end of the generator is connected to the bus.

In a preferred selection of the embodiment of the present invention, in the above power generation control circuit, the current detection circuit includes a first current transformer, a second current transformer and a third current transformer.

The first current transformer, the second current transformer and the third current transformer are respectively arranged at the three-phase output end of the generator, and the output ends are respectively connected to the input end of the voltage regulator.

In a preferred embodiment of the present invention, in the above-mentioned power generation control circuit, the voltage detection circuit includes a first fuse, a second fuse, a third fuse and a first transformer, and the first transformer includes a first primary coil and a first secondary coil coupled to each other.

One end of the first fuse, the second fuse and the third fuse are respectively connected to the three-phase output end of the generator, and the other end is respectively connected to each phase winding of the first primary coil, and each phase winding of the first secondary coil is respectively connected to the input end of the voltage regulator.

In a preferred embodiment of the present invention, in the above power generation control circuit, each phase winding of the first primary coil is connected in a triangle.

In a preferred selection of the embodiment of the present invention, in the above-mentioned power generation control circuit, the power generation system also includes a diesel engine for driving the generator, and the power generation control circuit also includes a speed regulator.

The input end of the speed regulator is connected to the output end of the current detection circuit and the output end of the voltage detection circuit respectively, and the output end is connected to the diesel engine to control the speed of the diesel engine according to the current value detected by the current detection circuit and the voltage value detected by the voltage detection circuit.

In a preferred embodiment of the present invention, in the above-mentioned power generation control circuit, the voltage detection circuit also includes a fourth fuse, a fifth fuse, a sixth fuse and a second transformer, and the second transformer includes a second primary coil and a second secondary coil coupled to each other.

One end of the fourth fuse, the fifth fuse and the sixth fuse are respectively connected to the three-phase output end of the generator, and the other end is respectively connected to each phase winding of the second primary coil, and each phase winding of the second secondary coil is respectively connected to the input end of the speed regulator.

In a preferred embodiment of the present invention, in the above power generation control circuit, each phase winding of the second primary coil is connected in a star shape.

In a preferred selection of the embodiment of the present invention, in the above power generation control circuit, the current detection circuit further includes a current display, and the voltage detection circuit further includes a voltage display and a button switch.

The current display is connected between the input end of the speed regulator and the output end of the current detection circuit, and the voltage display is connected to each phase winding of the second secondary coil through the button switch.

In a preferred selection of the embodiment of the present invention, in the above-mentioned power generation control circuit, the power generation control circuit also includes a reactive power display and an active power display.

The input end of the reactive power display is connected to the output end of the current detection circuit and each phase winding of the second secondary coil respectively, and the input end of the active power display is connected to the output end of the reactive power display and each phase winding of the second secondary coil.

On the basis of the above, an embodiment of the present invention further provides a power generation system, including a generator, a bus and the above power generation control circuit, wherein the generator is connected to the bus through the power generation control circuit.

The power generation control circuit and power generation system provided by the present invention, through the coordinated arrangement of the voltage regulator, the current detection circuit and the voltage detection circuit, the voltage regulator can adjust the output voltage of the generator according to the detection results of the current detection circuit and the voltage detection circuit, thereby solving the problem of the incoming circuit breaker being closed when the output voltage of the generator and the bus voltage do not match, and further solving the problem of the generator burning due to the mismatch when closing, thereby greatly improving the practicality and reliability of the power generation control circuit.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an application principle diagram of a power generation control circuit provided by an embodiment of the present invention.

FIG. 2 is a circuit schematic diagram of a voltage detection circuit provided in an embodiment of the present invention.

FIG. 3 is another circuit schematic diagram of the voltage detection circuit provided by an embodiment of the present invention.

FIG. 4 is a circuit schematic diagram of a power generation control circuit provided in an embodiment of the present invention.

Icons: 100-power generation control circuit; 110-voltage regulator; 120-incoming circuit breaker; 130-current detection circuit; 140-voltage detection circuit; 150-speed regulator; TA-first current transformer; TB-second current transformer; TC-third current transformer; F1-first fuse; F2-second fuse; F3-third fuse; T1-first transformer; L11-first primary coil; L12-first secondary coil; F4-fourth fuse; F5-fifth fuse; F6-sixth fuse; T2-second transformer; L21-second primary coil; L22-second secondary coil; P1-current display; P2-voltage display; S-button switch; P3-active power display; P4-reactive power display; P5-power meter; 200-generator; 300-bus.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present invention, the terms "first", "second", "third", "fourth", etc. are only used to distinguish the description and cannot be understood as just or implying relative importance.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in Fig. 1, an embodiment of the present invention provides a power generation control circuit 100, which is applied to a power generation system. The power generation system includes a generator 200 and a bus 300, and the power generation control circuit 100 includes a voltage regulator 110, an incoming line circuit breaker 120, a current detection circuit 130, and a voltage detection circuit 140.

Furthermore, in this embodiment, the generator 200 and the busbar 300 are connected via the incoming circuit breaker 120, the current detection circuit 130 is arranged on the generator 200 and the output end is connected to the input end of the voltage regulator 110, the input end of the voltage detection circuit 140 is connected to the output end of the generator 200, and the output end is connected to the input end of the voltage regulator 110, and the output end of the voltage regulator 110 is connected to the excitation winding of the generator 200.

Through the above settings, it can be achieved that: the current detection circuit 130 detects the current value at the output end of the generator 200 and sends it to the voltage regulator 110, the voltage detection circuit 140 detects the voltage value at the output end of the generator 200 and sends it to the voltage regulator 110, and the voltage regulator 110 controls the working current of the excitation winding according to the received current value and voltage value to control the output voltage of the generator 200, so that when the output voltage reaches the voltage value of the bus 300, the incoming circuit breaker 120 is controlled to be closed so that the output end of the generator 200 is connected to the bus 300.

Optionally, the method of controlling the closing of the incoming circuit breaker 120 is not limited, for example, the incoming circuit breaker 120 may be controlled to close automatically by a control device, or it may be manually closed by prompting an operator. In this embodiment, in order to avoid the problem of malfunction caused by the automatic closing of the incoming circuit breaker 120 by the control device, in this embodiment, the incoming circuit breaker 120 is controlled to close by an operator to achieve the connection between the motor and the bus 300.

Optionally, the specific detection method of the current detection circuit 130 is not limited, for example, it can be direct detection or mutual inductance detection. In this embodiment, in order to avoid the problem that the output current at the output end of the generator 200 is too large and causes damage to the detection equipment, the current detection circuit 130 detects through a mutual inductor.

Optionally, the electrical components included in the current detection circuit 130 when detecting through a transformer are not limited and can be set according to actual needs, for example, can be set according to the accuracy requirements for current detection. In this embodiment, the current detection circuit 130 may include a first current transformer TA, a second current transformer TB, and a third current transformer TC.

Furthermore, in this embodiment, the first current transformer TA, the second current transformer TB and the third current transformer TC are respectively arranged at the three-phase output ends of the generator 200, and the output ends are respectively connected to the input ends of the voltage regulator 110 to realize the separate detection of the output current of each phase of the generator 200.

Optionally, the electrical components included in the voltage detection circuit 140 are not limited and can be set according to actual needs, for example, can be set according to the accuracy requirements for voltage detection. In conjunction with Figure 2, in this embodiment, the voltage detection circuit 140 includes a first fuse F1, a second fuse F2, a third fuse F3 and a first transformer T1, and the first transformer T1 includes a first primary coil L11 and a first secondary coil L12 that are coupled and connected.

Furthermore, in this embodiment, one end of the first fuse F1, the second fuse F2 and the third fuse F3 are respectively connected to the three-phase output end of the generator 200, and the other end is respectively connected to each phase winding of the first primary coil L11, and each phase winding of the first secondary coil L12 is respectively connected to the input end of the voltage regulator 110.

Optionally, the connection mode of each winding of the first primary coil L11 is not limited, for example, it can be a triangle connection or a star connection. In this embodiment, in order to avoid the influence of the third harmonic and zero-sequence current generated inside the first primary coil L11 on the external circuit, the windings of each phase of the first primary coil L11 are connected in a triangle.

Optionally, the number of output ports of the first secondary coil L12 is not limited and can be set according to the type and quantity of voltages that the voltage regulator 110 needs to obtain. In this embodiment, the number of output ports of the first secondary coil L12 is 7, which are respectively used to output the voltages of any two phases of the three phases A, B, and C and the neutral line voltage, namely, U _AB , U _BA , U _BC , U _CB , U _CA , U _AC and U _N .

Further, in this embodiment, the power generation system may further include a diesel engine for driving the generator 200, and the power generation control circuit 100 may further include a speed regulator 150. The input end of the speed regulator 150 is respectively connected to the output end of the current detection circuit 130 and the output end of the voltage detection circuit 140, and the output end is connected to the diesel engine, so as to control the speed of the diesel engine according to the current value detected by the current detection circuit 130 and the voltage value detected by the voltage detection circuit 140.

In conjunction with Figure 3, considering that the speed regulator 150 and the voltage regulator 110 have different types and amplitudes of voltages required, the speed regulator 150 and the voltage regulator 110 obtain voltages in different ways. In this embodiment, the voltage detection circuit 140 also includes a fourth fuse F4, a fifth fuse F5, a sixth fuse F6 and a second transformer T2, and the second transformer T2 includes a second primary coil L21 and a second secondary coil L22 that are coupled to each other.

Furthermore, in this embodiment, one end of the fourth fuse F4, the fifth fuse F5 and the sixth fuse F6 are respectively connected to the three-phase output end of the generator 200, and the other end is respectively connected to each phase winding of the second primary coil L21, and each phase winding of the second secondary coil L22 is respectively connected to the input end of the speed regulator 150.

Optionally, the connection mode of each phase winding of the second primary coil L21 is not limited, for example, it can be a delta connection or a star connection. In this embodiment, each phase winding of the second primary coil L21 is star-connected to improve the balancing ability of the second transformer T2 when the voltage fluctuates.

Optionally, the number of output ports of the second secondary coil L22 is not limited and can be set according to the type and quantity of voltages that the speed regulator 150 needs to obtain. In this embodiment, the first secondary coil L12 has 4 output ports, which are respectively used to output the voltage of each phase of the three phases A, B, and C and the neutral line voltage, namely _UA , _UB , _UC, and _UN .

Furthermore, in order to facilitate the operator to obtain the output voltage and output current values of the generator 200 in a timely and convenient manner, in this embodiment, the current detection circuit 130 may also include a current display P1, and the voltage detection circuit 140 may also include a voltage display P2 and a button switch S.

In this embodiment, the current display P1 is connected between the input end of the speed regulator 150 and the output end of the current detection circuit 130, and the voltage display P2 is connected to each phase winding of the second secondary coil L22 through the button switch S.

Furthermore, in order to facilitate the operator to obtain the output power of the generator 200 in a timely and convenient manner, in this embodiment, the power generation control circuit 100 also includes a reactive power display P4 and an active power display P3 to detect the active power and reactive power of the output electric energy of the generator 200.

In this embodiment, the input end of the reactive power display P4 is respectively connected to the output end of the current detection circuit 130 and the phase windings of the second secondary coil L22, and the input end of the active power display P3 is connected to the output end of the reactive power display P4 and the phase windings of the second secondary coil L22.

In conjunction with FIG4 , further, in order to facilitate the operator to count the energy of the electric energy output by the generator 200, the power generation control circuit 100 may further include an electric power meter P5. The electric power meter P5 may obtain the output voltage and output current of the generator 200 separately to calculate the output electric energy, or may calculate the output electric energy according to the current and voltage detected by the current detection circuit 130 and the voltage detection circuit 140. In this embodiment, the simplicity and practicality of the power generation control circuit 100 are improved, and the electric power meter P5 calculates the output electric energy according to the current and voltage detected by the current detection circuit 130 and the voltage detection circuit 140. In order to further improve the simplicity and practicality of the power generation control circuit 100, the voltage regulator 110, the speed regulator 150, the reactive power display P4, the active power display P3 and the electric power meter P5 form a closed three-phase loop with the first current transformer TA, the second current transformer TB and the third current transformer TC.

An embodiment of the present invention further provides a power generation system, including a generator 200 , a bus 300 , and the power generation control circuit 100 , wherein the generator 200 and the bus 300 are connected via the power generation control circuit 100 .

Considering that the power generation system includes the power generation control circuit 100, the power generation system has all the technical features of the power generation control circuit 100, and can solve the same technical problems and produce the same technical effects. In this embodiment, the specific technical features of the power generation system are no longer described one by one. Please refer to the previous explanation of the power generation control circuit 100.

In summary, the present invention provides a power generation control circuit 100 and a power generation system. Through the coordinated arrangement of the voltage regulator 110, the current detection circuit 130 and the voltage detection circuit 140, the voltage regulator 110 can adjust the output voltage of the generator 200 according to the detection results of the current detection circuit 130 and the voltage detection circuit 140, thereby solving the problem of the incoming circuit breaker 120 being closed when the output voltage of the generator 200 and the bus 300 voltage do not match, and further solving the problem of the generator 200 burning due to the mismatch when closing, thereby greatly improving the practicality and reliability of the power generation control circuit 100.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (7)

1. The power generation control circuit is applied to a power generation system and is characterized by comprising a generator and a bus, wherein the power generation control circuit comprises a voltage regulator, an incoming line circuit breaker, a current detection circuit and a voltage detection circuit;

The generator is connected with the bus through the incoming line breaker, the input end of the current detection circuit is connected with the output end of the generator, the output end of the current detection circuit is connected with the input end of the voltage regulator, the input end of the voltage detection circuit is connected with the output end of the generator, the output end of the voltage detection circuit is connected with the input end of the voltage regulator, and the output end of the voltage regulator is connected with the excitation winding of the generator;

The current detection circuit detects the current value of the output end of the generator and sends the current value to the voltage regulator, the voltage detection circuit detects the voltage value of the output end of the generator and sends the voltage value to the voltage regulator, and the voltage regulator controls the working current of the exciting winding according to the received current value and the received voltage value to control the output voltage of the generator, so that when the output voltage reaches a bus voltage value, the incoming circuit breaker is controlled to be closed to enable the output end of the generator to be communicated with the bus;

the current detection circuit comprises a first current transformer, a second current transformer and a third current transformer;

The first current transformer, the second current transformer and the third current transformer are respectively arranged at the three-phase output end of the generator, and the output ends are respectively connected with the input end of the voltage regulator.

The voltage detection circuit comprises a first fuse, a second fuse, a third fuse and a first transformer, wherein the first transformer comprises a first primary coil and a first secondary coil which are connected in a coupling way;

One end of the first fuse, one end of the second fuse and one end of the third fuse are respectively connected with the three-phase output end of the generator, the other end of the first fuse is respectively connected with each phase winding of the first primary coil, and each phase winding of the first secondary coil is respectively connected with the input end of the voltage regulator;

The power generation system further comprises a diesel engine for driving the generator, and the power generation control circuit further comprises a rotation speed regulator;

The input end of the rotating speed regulator is connected with the output end of the current detection circuit and the output end of the voltage detection circuit respectively, and the output end of the rotating speed regulator is connected with the diesel engine so as to control the rotating speed of the diesel engine according to the current value detected by the current detection circuit and the voltage value detected by the voltage detection circuit.

2. The power generation control circuit of claim 1, wherein the phase windings of the first primary coil are delta-connected.

3. The power generation control circuit of claim 1, wherein the voltage detection circuit further comprises a fourth fuse, a fifth fuse, a sixth fuse, and a second transformer comprising a second primary coil and a second secondary coil coupled together;

One end of the fourth fuse, one end of the fifth fuse and one end of the sixth fuse are respectively connected with the three-phase output end of the generator, the other end of the fourth fuse is respectively connected with each phase winding of the second primary coil, and each phase winding of the second secondary coil is respectively connected with the input end of the rotating speed regulator.

4. A power generation control circuit according to claim 3, wherein the windings of each phase of the second primary coil are connected in a star configuration.

5. The power generation control circuit of claim 3, wherein the current detection circuit further comprises a current display, the voltage detection circuit further comprising a voltage display and a push button switch;

The current display is connected between the input end of the rotating speed regulator and the output end of the current detection circuit, and the voltage display is connected with each phase winding of the second secondary coil through the button switch.

6. The power generation control circuit of claim 3, further comprising a reactive power display and an active power display;

the input end of the reactive power display is connected with the output end of the current detection circuit and each phase winding of the second secondary coil respectively, and the input end of the active power display is connected with the output end of the reactive power display and each phase winding of the second secondary coil.

7. A power generation system comprising a power generator, a bus bar, and the power generation control circuit of any one of claims 1 to 6, the power generator and the bus bar being connected by the power generation control circuit.