CN104779044B - A Saturable Reactor with Harmonic Rectification Path - Google Patents

Abstract

The invention relates to a saturable reactor with a harmonic rectification access. The saturable reactor comprises a closed-loop core, wherein one core column is provided with a coil L1 and a coil L3; the other core column is provided with a coil L2 and a coil L4; the homonymous end of the coil L1 and the homonymous end of the coil L2 are connected with a terminal I; the heteronymous end of the coil L1 and the heteronymous end of the coil L2 are connected with a terminal II through a forward thyristor D1 and a reverse thyristor D2; the two ends of the thyristor D1 are connected with a resistor R1 in parallel, and the two ends of the thyristor D2 are connected with a resistor R2 in parallel; a control terminal of the thyristor D1 and a control terminal of the thyristor D2 are connected with a control circuit; the control circuit controls the size of the firing angle of the thyristor D1 and the size of the firing angle of the thyristor D2, and the rectification quantity of the thyristor D1 and the thyristor D2 is adjusted continuously; the homonymous end of the coil L3 and the homonymous end of the coil L4 are connected together, and the heteronymous end of the coil L3 and the heteronymous end of the coil L4 are connected with a diode D3.

Description

A Saturable Reactor with Harmonic Rectification Path

technical field

The invention relates to the technical field of power transmission and transformation in power systems, in particular to a saturated reactor with a harmonic rectification path.

Background technique

Reactors are widely used in power systems. The series reactor can limit the short-circuit current; the shunt reactor can limit the overvoltage; the combination of the reactor and the capacitor can form a filter circuit. In some application fields, the reactance value of the reactor is fixed; in some application fields, the reactance value of the reactor should be adjusted continuously with the change of the power system operation mode. The controllable saturable reactor (also called: saturable reactor, magnetron reactor) whose reactance value can be adjusted continuously is an important research topic.

The saturable reactor uses the saturation characteristics of the closed-loop iron core of the saturable reactor to change the reactance value of the reactor. Many saturable reactors have been proposed. In 2008, China Water Conservancy and Hydropower Press published Cai Xuansan and Gao Yuenong's book "Controllable Saturable Reactor Principles, Design and Application" to summarize the saturable reactor. CN201510103299.8 proposes a saturable reactor with simple structure. How to further shorten the transient response time of the existing saturable reactor and how to further reduce the harmonic content of the existing saturable reactor are important research topics and research directions.

Contents of the invention

The object of the present invention is to solve the above problems, and provide a saturated reactor with short transient response time, small harmonic content and harmonic rectification path.

To achieve the above object, the present invention adopts the following methods:

A saturated reactor with a harmonic rectification path, which is single-phase, including a single-phase saturated reactor with a simple structure, a single-phase saturated reactor with a simple structure has a closed-loop iron core of a saturated reactor, and the saturated reactor At least one harmonic rectification path unit is added on each iron core column with coils of the closed-loop iron core. Each harmonic rectification path unit is composed of a pair of coils and a diode connected to the pair of coils. The pair of coils is installed in the saturated Different iron core columns of the reactor closed-loop iron core.

The harmonic rectification path unit includes a coil L3 and a coil L4, both of which are located on different iron core columns, the ends of the same name of the coil L3 and the coil L4 are connected, and the ends of different names are connected to the diode D3, and one end of the diode D3 is connected to the harmonic Terminal II of the saturable reactor in the wave rectification path is connected.

The harmonic rectification path unit includes a coil L3 and a coil L4, both of which are located on different iron core columns; after the terminals of the same name of the coil L3 and the coil L4 are connected, they are connected with the terminal I of the saturated reactor with the harmonic rectification path, and the different The first terminals are connected with the diode D3; at the same time, the different terminals of the coil L3 and the coil L4 are respectively connected with the same terminals of the original coils on the respective iron core columns.

The harmonic rectification path unit includes a coil L3 and a coil L4, both of which are located on different iron core columns; after the terminals of the same name of the coil L3 and the coil L4 are connected, they are connected with the terminal I of the saturated reactor with a harmonic rectification path, and the different The end of the name is connected with the diode D3; at the same time, the end of the opposite name is connected with the end of the same name of the original coil on the other iron core column.

Add another harmonic path unit, that is, add coil L7 and coil L8 respectively on two different iron core columns; the same-name ends of coil L7 and coil L8 are connected together, and the opposite-name ends of coil L7 and coil L8 are connected to diode D4; One end of D4 is connected to terminal II.

The number of turns of the coil L7 and the coil L8 are equal.

The number of turns of the coil L3 and the coil L4 are equal.

The amplitudes of the high-order harmonic voltages generated by the coil L3 and the coil L4 are equal, but the phases are not equal. The diode D3 has a harmonic rectification current flowing through it, forming a harmonic rectification path.

The amplitudes of the high-order harmonic voltages generated on the coils L7 and L8 are equal, but the phases are not equal. The diode D4 has a harmonic rectification current flowing through it, forming a harmonic rectification path.

A saturated reactor with a harmonic rectification path is a three-phase saturated reactor with a harmonic rectification path using the single-phase saturated reactor with a harmonic rectification path.

The beneficial effects of the invention are: adding a harmonic rectification path composed of diodes in the saturated reactor circuit can shorten the transient response time of the saturated reactor and reduce the harmonic content of the saturated reactor. The measures are simple and reliable.

Description of drawings

Figure 1 shows the basic structure of the existing saturable reactor.

Figure 2 shows the first saturable reactor with harmonic rectification path.

Figure 3 shows the second kind of saturated reactor with harmonic rectification path.

Figure 4 shows the third kind of saturated reactor with harmonic rectification path.

Among them, 1. Saturable reactor terminal I, 2. Saturable reactor terminal II, 3. Saturable reactor core, 4. Control circuit.

detailed description

Example 1:

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

CN201510103299.8 proposes a saturable reactor with a simple structure, as shown in Figure 1. On this basis, it is the purpose of the present invention to further shorten the transient response time of the saturated reactor and further reduce the harmonic content of the saturated reactor.

The structure and connection method of the first saturable reactor with harmonic rectification path are shown in Figure 2. Including saturable reactor terminal I1, saturated reactor terminal II2, saturable reactor closed-loop iron core 3, control circuit 4. The closed-loop iron core 3 of the saturable reactor has at least two iron core columns with equal cross-sectional areas and coils; each of the two iron core columns can at least form a magnetic flux closed loop that does not pass through the opposite iron core column.

The closed-loop iron core 3 of the saturable reactor can be two closed-loop iron cores that have no paths to each other, for example, 1: two square-shaped iron cores. It can also be an integrated closed-loop iron core with mutual passages; for example 2: three iron core columns, and there are yokes at both ends of the iron core columns to connect the three iron core columns. Any two iron core columns can form a magnetic flux closed loop with each other. But there are at least two of them that can respectively form closed loops that do not pass through each other's iron core columns. For example 3: There are four iron core columns, and there are yokes at both ends of the iron core columns to connect the four iron core columns. Any two iron core columns can form a closed magnetic flux loop with each other, but at least two of them can form a magnetic flux loop without passing through each other. The closed loop of the stem is shown in Figure 2.

Saturable reactor closed-loop iron core 3 has two iron core columns with equal cross-sectional areas, one of which has a coil L1 on it; the other has a coil L2; the number of turns of coil L1 and coil L2 is equal. The terminals with the same name of coil L1 and coil L2 are connected to the terminal I1 of the saturated reactor, and the terminals of the same name of the coil L1 and coil L2 are respectively connected to the terminal II2 of the saturated reactor through the forward thyristor D1 and the reverse thyristor D2; the two ends of the thyristor D1 and the thyristor D2 The resistance R1 and the resistance R2 are also connected in parallel respectively; the resistance values of the resistance R1 and the resistance R2 are equal; the control terminals of the thyristor D1 and the thyristor D2 are respectively connected to the control circuit 4 .

The control circuit 4 controls the firing angles of the thyristor D1 and the thyristor D2, so as to continuously adjust the rectification flow of the thyristor D1 and the thyristor D2.

The above structure and connection method are the same as CN201510103299.8. It can be seen from Figure 2 that the first saturable reactor with harmonic rectification path also includes: a coil L3 on one of the iron core columns, and a coil L4 on the other iron core column; coil L3, coil L4 The number of turns is equal; the same-name ends of the coil L3 and the coil L4 are connected together, and the diode D3 is connected between the opposite-name ends of the coil L3 and the coil L4. One end of diode D3 is connected to one end of thyristor D1 and thyristor D2 to ensure that the potentials of all semiconductor devices in the first type of saturated reactor with harmonic rectification path are close to each other and the voltage to ground is low.

Set the rated voltage of the first kind of saturated reactor with harmonic rectification path as U1. The first kind of saturated reactor with harmonic rectification path is connected to the power system with rated voltage U1. When the control circuit 4 controls the thyristor D1 and the thyristor D2 to be completely cut off, the coil L1 and the coil L2 will have excitation current flow, and the excitation current Flow through resistor R1 and resistor R2; AC voltage is generated at both ends of resistor R1 and resistor R2. Resistors R1 and R2 provide an AC voltage source for generating DC current. Thyristor D1 and thyristor D2 are respectively connected in parallel at both ends of resistor R1 and resistor R2; since thyristor D1 and thyristor D2 are all cut off, the rectifier circuit of thyristor D1 and thyristor D2 does not work, and the DC current in coil L1 and coil L2 is equal to zero. The saturable reactor has a maximum reactance value Zmax.

When the control circuit 4 controls the thyristor D1 and the thyristor D2 to be fully turned on, the thyristor D1 and the thyristor D2 become diode characteristics, and the thyristor D1 and the thyristor D2 form half-wave rectification circuits respectively. The DC currents of coil L1 and coil L2 reach the maximum design value. The saturable reactor has a minimum reactance value Zmin.

The control circuit 4 controls the magnitude of the rectification flow of the thyristor D1 and the thyristor D2, and can control the magnitude of the DC current in the coil L1 and the coil L2, so as to realize the control of the reactance value of the saturated reactor. The control circuit 4 continuously controls the rectification flow of the thyristor D1 and the thyristor D2, and can continuously control the magnitude of the DC current in the coil L1 and the coil L2 to realize continuous adjustment of the reactance value of the saturated reactor, and the reactance value of the saturated reactor is between the maximum value and the minimum value Adjust and change between.

Coil L1 and coil L3 are wound on the same iron core column, and coil L2 and coil L4 are wound on the same iron core column; since the number of turns of coil L1 and coil L2 is equal, the number of turns of coil L3 and coil L4 is equal, and the number of turns of coil L1 and coil L2 The power frequency (fundamental wave) voltages at both ends are equal, so the power frequency (fundamental wave) voltages at both ends of the coil L3 and coil L4 are equal. The power frequency (fundamental wave) voltage at both ends of the diode D3 is equal; due to engineering errors, if a power frequency (fundamental wave) voltage error occurs at both ends of the diode D3, the rectified value of the power frequency (fundamental wave) current flowing through the diode D3 will not be the same. greater than the peak value of the field current. The peak value of the excitation current is very small and can be ignored in approximate analysis.

When the control circuit 4 controls the rectification flow of the thyristor D1 and the thyristor D2, the current in the coil L1 and the coil L2 contains high-order harmonics, and the high-order harmonics will generate high-order harmonic voltages on the coils L3 and L4. Experiments show that , the amplitudes of the high-order harmonic voltages generated on the coil L3 and the coil L4 respectively are equal, but the phases are not equal. Thus, a higher harmonic voltage will be generated across the diode D3. Coil L3, coil L4, and diode D3 form a high-order harmonic rectification circuit. A harmonic rectification current flows through the diode D3, that is, the diode D3 forms a harmonic rectification path.

Experiments show that, whether the thyristor D1 and thyristor D2 of the existing saturable reactor are fully turned on or not completely turned on, the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 180°. After adding diode D3 and its harmonic rectification path, when thyristor D1 and thyristor D2 are not completely turned on, the phase relationship between the fundamental wave of the saturated reactor current and the third harmonic is 180°; when thyristor D1 and thyristor D2 are fully turned on , the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 0°. It can be seen that after adding diode D3 and its harmonic rectification path, it is beneficial to control the proportional relationship between the fundamental wave and the third harmonic of the saturated reactor current.

Experiments show that due to the addition of diode D3 and its harmonic rectification path, the transient response time of the saturable reactor is shortened, and the harmonic content of the saturable reactor is reduced.

The first type of saturated reactor with harmonic rectification path shown in Figure 2 is a single-phase saturated reactor. The single-phase saturated reactor can be extended to the three-phase saturated reactor. Promotion methods are public knowledge, no longer cumbersome.

Example 2:

The structure and connection method of the second saturable reactor with harmonic rectification path are shown in Figure 3. Including saturable reactor terminal I1, saturated reactor terminal II2, saturated reactor closed-loop iron core 3, and control circuit 4. The closed-loop iron core 3 of the saturable reactor has at least two iron core columns with equal cross-sectional areas and coils; each of the two iron core columns can at least form a magnetic flux closed loop that does not pass through the opposite iron core column.

Saturable reactor closed-loop iron core 3 Two iron core columns with equal cross-sectional area, one of which has coil L3 and coil L5; the other iron core column has coil L4 and coil L6; coil L3 and coil L4 The number of turns is equal, and the number of turns of coil L5 and coil L6 is equal. The terminals with the same name of coil L3 and coil L4 are connected to the saturable reactor terminal I1, the terminals of different names of coil L3 are connected with the terminals of the same name of coil L5, the terminals of different names of coil L4 are connected with the terminals of the same name of coil L6, and the terminals of coil L5 and coil L6 are connected with the same terminal of the same name Connect the saturated reactor terminal II2 through the forward thyristor D1 and the reverse thyristor D2 respectively; the two ends of the thyristor D1 and the thyristor D2 are respectively connected in parallel with the resistance R1 and the resistance R2, and the resistance values of the resistance R1 and the resistance R2 are equal; the thyristor D1 and the thyristor D2 The control terminals are connected to the control circuit 4 respectively.

The control circuit 4 controls the firing angles of the thyristor D1 and the thyristor D2, so as to continuously adjust the rectification flow of the thyristor D1 and the thyristor D2.

A diode D3 is also connected between the opposite end of the coil L3 and the opposite end of the coil L4.

Set the rated voltage of the second type of saturated reactor with harmonic rectification path as U1. The second kind of saturated reactor with harmonic rectification path is connected to the power system with rated voltage U1. When the control circuit 4 controls the thyristor D1 and thyristor D2 to be completely cut off, the coil L3, coil L4, coil L5, and coil L6 will have excitation The current flows, the excitation current flows through the resistors R1 and R2, and an AC voltage is generated at both ends of the resistors R1 and R2. Resistors R1 and R2 provide an AC voltage source for generating DC current. Thyristor D1 and thyristor D2 are respectively connected in parallel at both ends of resistor R1 and resistor R2; since thyristor D1 and thyristor D2 are all cut off, the rectifier circuit of thyristor D1 and thyristor D2 does not work, and the DC current in coil L3, coil L4, coil L5 and coil L6 is equal to zero. The saturable reactor has a maximum reactance value Zmax.

When the control circuit 4 controls the thyristor D1 and the thyristor D2 to be fully turned on, the thyristor D1 and the thyristor D2 become diode characteristics, and the thyristor D1 and the thyristor D2 form half-wave rectification circuits respectively. The DC currents of coil L3, coil L4, coil L5 and coil L6 reach the maximum design value. The saturable reactor has a minimum reactance value Zmin.

The control circuit 4 controls the magnitude of the rectification flow of the thyristor D1 and the thyristor D2, and can control the magnitude of the DC current in the coil L3, the coil L32, the coil L5, and the coil L6, so as to realize the control of the reactance value of the saturated reactor. The control circuit 4 continuously controls the magnitude of the rectification flow of the thyristor D1 and the thyristor D2, and can continuously control the magnitude of the DC current in the coil L3, coil L4, coil L5, and coil L6 to realize continuous adjustment of the reactance value of the saturated reactor, and the reactance value of the saturated reactor Adjust and change between maximum and minimum values.

Coil L3 and coil L5 are wound on the same iron core column, and coil L4 and coil L6 are wound on the same iron core column; since the number of turns of coil L3 and coil L5 is equal, the number of turns of coil L4 and coil L6 is equal, and the number of turns of coil L3 and coil L5 The power frequency (fundamental wave) voltage connected in series is equal to the power frequency (fundamental wave) voltage of coil L4 and coil L6 connected in series; therefore, the power frequency (fundamental wave) voltage at both ends of coil L3 and coil L4 is equal. The power frequency (fundamental wave) voltage at both ends of the diode D3 is equal; due to engineering errors, if a power frequency (fundamental wave) voltage error occurs at both ends of the diode D3, the rectified value of the power frequency (fundamental wave) current flowing through the diode D3 will not be the same. greater than the peak value of the field current. The peak value of the excitation current is very small and can be ignored in approximate analysis.

When the control circuit 4 controls the rectification flow of the thyristor D1 and the thyristor D2, the currents in the coil L3, coil L4, coil L5, and coil L6 contain high-order harmonics, which will generate high-order harmonics on the coils L3 and coil L4 Harmonic voltage. Experiments show that the amplitudes of the high-order harmonic voltages generated on the coil L3 and the coil L4 are equal, but the phases are not equal. Thus, a higher harmonic voltage will be generated across the diode D3. Coil L3, coil L4, and diode D3 form a high-order harmonic rectification circuit. A harmonic rectification current flows through the diode D3, that is, the diode D3 forms a harmonic rectification path.

Experiments show that, whether the thyristor D1 and thyristor D2 of the existing saturable reactor are fully turned on or not completely turned on, the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 180°. After adding diode D3 and its harmonic rectification path, when thyristor D1 and thyristor D2 are not completely turned on, the phase relationship between the fundamental wave of the saturated reactor current and the third harmonic is 180°; when thyristor D1 and thyristor D2 are fully turned on , the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 0°. It can be seen that after adding diode D3 and its harmonic rectification path, it is beneficial to control the proportional relationship between the fundamental wave and the third harmonic of the saturated reactor current.

Experiments show that due to the addition of diode D3 and its harmonic rectification path, the transient response time of the saturable reactor is shortened, and the harmonic content of the saturable reactor is reduced.

The sum of the turns of the coil L3 and the coil L5 is equal to the turns of the existing saturable reactor coil L1, and the sum of the turns of the coil L2 and the coil L4 is equal to the turns of the existing saturable reactor coil L2. Compared with the existing saturated reactor, the second kind of saturated reactor with harmonic rectification path does not increase the weight and volume.

The same part of the analysis method in this embodiment as in Embodiment 1 is not repeated here.

Example 3:

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The structure and connection method of the third saturable reactor with harmonic rectification path are shown in Figure 4. Including saturable reactor terminal I1, saturated reactor terminal II2, saturated reactor closed-loop iron core 3, and control circuit 4. The closed-loop iron core 3 of the saturable reactor has at least two iron core columns with equal cross-sectional areas and coils; each of the two iron core columns can at least form a magnetic flux closed loop that does not pass through the opposite iron core column.

Saturable reactor closed-loop iron core 3 Two iron core columns with equal cross-sectional area, one of which has coil L3 and coil L5; the other iron core column has coil L4 and coil L6; coil L3 and coil L4 The turns of the coils are equal, the turns of the coil L5 and the coil L6 are equal, and the turns of the coil L3 and the coil L5 are not equal. The terminals with the same name of coil L3 and coil L4 are connected to the saturable reactor terminal I 1, the terminals of different names of coil L3 are connected with the terminals of the same name of coil L6, the terminals of different names of coil L4 are connected with the terminals of the same name of coil L5, the terminals of coils L5 and L6 are connected with the same name Terminals are respectively connected to the saturated reactor terminal II2 through the forward thyristor D1 and the reverse thyristor D2; the two ends of the thyristor D1 and the thyristor D2 are respectively connected in parallel with the resistance R1 and the resistance R2, and the resistance values of the resistance R1 and the resistance R2 are equal; the thyristor D1, the thyristor The control terminals of D2 are respectively connected to the control circuit 4 .

The control circuit 4 controls the firing angles of the thyristor D1 and the thyristor D2, so as to continuously adjust the rectification flow of the thyristor D1 and the thyristor D2.

A diode D3 is also connected between the opposite end of the coil L3 and the opposite end of the coil L4.

Set the rated voltage of the first kind of saturated reactor with harmonic rectification path as U1. The first kind of saturated reactor with harmonic rectification path is connected to the power system with rated voltage U1. When the control circuit 4 controls the thyristor D1 and thyristor D2 to be completely cut off, the coil L3, coil L4, coil L5, and coil L6 will have excitation The current flows, the excitation current flows through the resistors R1 and R2, and an AC voltage is generated at both ends of the resistors R1 and R2. Resistors R1 and R2 provide an AC voltage source for generating DC current. Thyristor D1 and thyristor D2 are respectively connected in parallel at both ends of resistor R1 and resistor R2; since thyristor D1 and thyristor D2 are all cut off, the rectifier circuit of thyristor D1 and thyristor D2 does not work, and the DC current in coil L3, coil L32, coil L5 and coil L6 is equal to zero. The saturable reactor has a maximum reactance value Zmax.

When the control circuit 4 controls the thyristor D1 and the thyristor D2 to be fully turned on, the thyristor D1 and the thyristor D2 become diode characteristics, and the thyristor D1 and the thyristor D2 form half-wave rectification circuits respectively. The DC currents of coil L3, coil L4, coil L5 and coil L6 reach the maximum design value. The direction of direct current in coil L4 and coil L5 is downward, and the direction of direct current in coil L3 and coil L6 is upward. Coil L3 and coil L5 are on the same iron core column. If the number of turns of coil L3 and coil L5 is equal, the magnetic potential generated by coil L3 in the iron core column is equal in size and direction to the magnetic potential generated by coil L5 in the iron core column. On the contrary, the resultant magnetic potential generated in the core leg is equal to zero. Similarly, the coil L4 and the coil L6 are on the same iron core column, if the turns of the coil L4 and the coil L6 are equal, the resultant magnetic potential generated in the iron core column is equal to zero.

Since it is stipulated that the number of turns of coil L3 and coil L5 is not equal, the number of turns of coil L3 and coil L4 is equal, and the number of turns of coil L5 and coil L6 is equal; The DC flux in one leg is pointing up and the DC flux in the other leg is pointing down. The greater the degree of unequal number of turns of the coil L3 and the coil L5, the greater the DC magnetic flux in the iron core column. The greater the DC magnetic flux in the iron core column, the greater the AC reactive current generated by coil L3, coil L4, coil L5, and coil L6, and the smaller the reactance value of the saturable reactor. According to design requirements, when the control circuit 4 controls the thyristor D1 and the thyristor D2 to be fully turned on, the saturated reactor has a minimum reactance value Zmin.

The control circuit 4 controls the magnitude of the rectification flow of the thyristor D1 and the thyristor D2, and can control the magnitude of the DC current in the coil L3, coil L4, coil L5, and coil L6, so as to realize the control of the reactance value of the saturated reactor. The control circuit 4 continuously controls the magnitude of the rectification flow of the thyristor D1 and the thyristor D2, and can continuously control the magnitude of the DC current in the coil L3, coil L4, coil L5, and coil L6 to realize continuous adjustment of the reactance value of the saturated reactor, and the reactance value of the saturated reactor Adjust and change between maximum and minimum values.

Coil L3 and coil L5 are wound on the same iron core column, and coil L4 and coil L6 are wound on the same iron core column; since the number of turns of coil L3 and coil L5 is equal, the number of turns of coil L4 and coil L6 is equal, and the number of turns of coil L3 and coil L6 The power frequency (fundamental wave) voltage connected in series is equal to the power frequency (fundamental wave) voltage of coil L4 and coil L5 connected in series; therefore, the power frequency (fundamental wave) voltage at both ends of coil L3 and coil L4 is equal. The power frequency (fundamental wave) voltage at both ends of the diode D3 is equal; due to engineering errors, if a power frequency (fundamental wave) voltage error occurs at both ends of the diode D3, the rectified value of the power frequency (fundamental wave) current flowing through the diode D3 will not be the same. greater than the peak value of the field current. The peak value of the excitation current is very small and can be ignored in approximate analysis.

When the control circuit 4 controls the rectification flow of the thyristor D1 and the thyristor D2, the currents in the coil L3, coil L4, coil L5, and coil L6 contain high-order harmonics, which will generate high-order harmonics on the coils L3 and coil L4 Harmonic voltage. Experiments show that the amplitudes of the high-order harmonic voltages generated on the coil L3 and the coil L4 are equal, but the phases are not equal. Thus, a higher harmonic voltage will be generated across the diode D3. Coil L3, coil L4, and diode D3 form a high-order harmonic rectification circuit. A harmonic rectification current flows through the diode D3, that is, the diode D3 forms a harmonic rectification path.

Experiments show that, whether the thyristor D1 and thyristor D2 of the existing saturable reactor are fully turned on or not completely turned on, the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 180°. After adding diode D3 and its harmonic rectification path, when thyristor D1 and thyristor D2 are not completely turned on, the phase relationship between the fundamental wave of the saturated reactor current and the third harmonic is 180°; when thyristor D1 and thyristor D2 are fully turned on , the phase relationship between the fundamental wave and the third harmonic of the saturated reactor current is 0°. It can be seen that after adding diode D3 and its harmonic rectification path, it is beneficial to control the proportional relationship between the fundamental wave and the third harmonic of the saturated reactor current.

Experiments show that due to the addition of diode D3 and its harmonic rectification path, the transient response time of the saturable reactor is shortened, and the harmonic content of the saturable reactor is reduced.

The sum of the turns of the coil L3 and the coil L5 is equal to the turns of the existing saturable reactor coil L1, and the sum of the turns of the coil L2 and the coil L4 is equal to the turns of the existing saturable reactor coil L2. Compared with the existing saturated reactor, the second kind of saturated reactor with harmonic rectification path does not increase the weight and volume.

In addition, the third type of saturated reactor with a harmonic rectification path can also add a coil L7 to one of the iron core columns, and a coil L8 to the other iron core column; the number of turns of the coil L7 and the coil L8 are equal; the coil The same-name ends of L7 and coil L8 are connected together, and the opposite-name ends of coil L7 and coil L8 are connected with diode D4. One end of the diode D4 is connected to the thyristor D3 and one end of the thyristor D4 to ensure that the potentials of all semiconductor devices in the third type of saturated reactor with harmonic rectification paths are close and the voltage to ground is low. Experiments show that adding a harmonic rectification circuit composed of coil L7, coil L8, and diode D4 can improve the effect of the harmonic rectification channel. The disadvantage is that it increases the complexity of the structure.

The same part of the analysis method in this embodiment as in Embodiment 1 is not repeated here.

The saturable reactor with harmonic rectification path of the present invention can be designed and manufactured by the prior art, can be realized completely, and has wide application prospect.

Claims (9)

1. a kind of saturable reactor having harmonic wave rectification path, is characterized in that, it is single-phase, simple including single-phase structure Saturable reactor, the simple saturable reactor of single-phase structure has saturable reactor closed loop iron core, in saturable reactor closed loop ferrum Core respectively carry coil iron core column on set up at least one harmonic wave rectification path unit, each harmonic wave rectification path unit by A pair of coil and diode coil being connected with this are constituted, and this is arranged on the difference of saturable reactor closed loop iron core to coil In iron core column；

Described harmonic wave rectification path unit includes coil l3, coil l4, and both are located in different iron core column, coil l3, coil The Same Name of Ends of l4 connects, and connects diode d3 between different name end, and one end of diode d3 is then electric with the saturation having harmonic wave rectification path The terminal ii of anti-device connects.

2. a kind of saturable reactor having harmonic wave rectification path, is characterized in that, it is single-phase, simple including single-phase structure Saturable reactor, the simple saturable reactor of single-phase structure has saturable reactor closed loop iron core, in saturable reactor closed loop ferrum Core respectively carry coil iron core column on set up at least one harmonic wave rectification path unit, each harmonic wave rectification path unit by A pair of coil and diode coil being connected with this are constituted, and this is arranged on the difference of saturable reactor closed loop iron core to coil In iron core column；

Described harmonic wave rectification path unit includes coil l3, coil l4, and both are located in different iron core column；Coil l3, coil The Same Name of Ends of l4 is connected with the terminal i of the saturable reactor having harmonic wave rectification path after connecting, between different name end with diode d3 even Connect；Meanwhile, coil l3, the different name end of coil l4 are also connected with the Same Name of Ends of primary coil in respective iron core column respectively.

3. a kind of saturable reactor having harmonic wave rectification path, is characterized in that, it is single-phase, simple including single-phase structure Saturable reactor, the simple saturable reactor of single-phase structure has saturable reactor closed loop iron core, in saturable reactor closed loop ferrum Core respectively carry coil iron core column on set up at least one harmonic wave rectification path unit, each harmonic wave rectification path unit by A pair of coil and diode coil being connected with this are constituted, and this is arranged on the difference of saturable reactor closed loop iron core to coil In iron core column；

Described harmonic wave rectification path unit includes coil l3, coil l4, and both are located in different iron core column；Coil l3, coil The Same Name of Ends of l4 is connected with the terminal i of the saturable reactor having harmonic wave rectification path after connecting, between different name end with diode d3 even Connect；Meanwhile, different name end is connected with the Same Name of Ends of primary coil in another iron core column.

4. there is the saturable reactor of harmonic wave rectification path as claimed in claim 3, it is characterized in that, then set up a harmonic wave path Unit, increases coil l7 and coil l8 in two different iron core column respectively；Coil l7, the Same Name of Ends of coil l8 are connected to one Rise, coil l7, the different name end of coil l8 connect diode d4；One end of diode d4 is connected with terminal ii.

5. there is the saturable reactor of harmonic wave rectification path as claimed in claim 4, it is characterized in that, described coil l7, coil l8 Equal turn numbers.

6. the as claimed in claim 1 or 2 or 3 or 4 saturable reactor having harmonic wave rectification path, is characterized in that, described coil L3, coil l4 equal turn numbers.

7. the as claimed in claim 1 or 2 or 3 or 4 saturable reactor having harmonic wave rectification path, is characterized in that, described coil L3 is equal with the amplitude of the higher harmonic voltage producing respectively on coil l4, but phase place is unequal, and diode d3 has harmonic wave whole Stream electric current flows through, and constitutes harmonic wave rectification path.

8. there is the saturable reactor of harmonic wave rectification path as claimed in claim 4, it is characterized in that, described coil l7, coil l8 The amplitude of the upper higher harmonic voltage producing respectively is equal, but phase place is unequal, and diode d4 has harmonic wave rectification electric current to flow through, Constitute harmonic wave rectification path.

9. a kind of saturable reactor having harmonic wave rectification path, is characterized in that, it is arbitrary described single-phase using claim 1-4 The three-phase having the saturable reactor of harmonic wave rectification path has the saturable reactor of harmonic wave rectification path.