CN109445511B - 10 kilovolt thyristor valve group power regulating system - Google Patents
10 kilovolt thyristor valve group power regulating system Download PDFInfo
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- CN109445511B CN109445511B CN201811442437.5A CN201811442437A CN109445511B CN 109445511 B CN109445511 B CN 109445511B CN 201811442437 A CN201811442437 A CN 201811442437A CN 109445511 B CN109445511 B CN 109445511B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
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Abstract
The invention belongs to the technical field of power electronics, and particularly relates to a 10KV thyristor valve group power regulation system, in particular to application of a comprehensive voltage regulation circuit for realizing grouped step regulation and continuous regulation of thyristors between two stages in a 10KV thyristor alternating current voltage regulation circuit. The multi-stage power-class control circuit consists of a plurality of stages of stage-class control with equal power class and a set of continuous voltage-regulating circuits, wherein the voltage-regulating circuits are formed by connecting and disconnecting a sectional heating body with a plurality of switch cabinets and adding a voltage-regulating cabinet; the system is divided into a plurality of branches, and each branch corresponds to a group of load heating bodies; the voltage adjusting unit is respectively connected to the branches to be accessed through switch transfer to adjust the voltage; when the branch circuit reaches full-voltage output, the voltage regulator is switched to the next branch circuit, and voltage regulation is continued; six branch circuits are configured in an isovolumetric mode, and seamless continuous adjustment of output power from 0 to the maximum value is achieved. The power supply has the characteristics of simple structure and reasonable design, can directly take power from a 10KV power grid, and completes the voltage regulation requirement of megawatt with the power, so that the output voltage is continuously and smoothly regulated.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a 10 kilovolt thyristor valve group power regulation system, in particular to application of a comprehensive voltage regulation circuit for realizing grouped step regulation and continuous regulation of thyristors between two stages in a 10 kilovolt thyristor alternating current voltage regulation circuit.
Background
The high-power electric boiler has very high power, and low-voltage power supply can not meet the requirement, and 10 kilovolts is required to be used for power supply. The heating power is changed in a mode of sectionally inputting a plurality of power levels of heaters, the heating power is intermittent, the control and adjustment precision of a sectionally stepped mode is low, the requirement of high-precision temperature control cannot be met, and a high-power continuous pressure regulating technology is a key technology of a high-power electric heating boiler.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a 10 kilovolt thyristor valve group power regulating system, which aims to provide a regulating system which continuously regulates voltage between stages through a continuous voltage regulating circuit, so that the output voltage is continuously and smoothly regulated, and a very fine and smooth regulating effect can be obtained.
The technical scheme adopted for solving the technical problems is as follows:
a10 KV thyristor valve group power regulating system is composed of a plurality of sections of equal power levels, a set of continuous voltage regulating circuits is matched, and the system is a high-voltage high-power voltage regulating circuit, and is used for directly taking electricity from a 10KV power grid, and completing the voltage regulating requirement that the power is megawatt; the device is composed of a plurality of switch cabinets, a sectional heating body which is connected and disconnected, and a voltage adjusting cabinet; the system is divided into a plurality of branches, and each branch corresponds to a group of load heating bodies; the voltage adjusting units are respectively connected to branches to be accessed through switch transfer, and then voltage adjustment is carried out; when the current branch circuit has reached the full-voltage output, the voltage regulator is switched to the next branch circuit, and voltage regulation is continued; the capacity of the six branches is configured in an isovolumetric way, so that seamless continuous adjustment of output power from 0 to the maximum value is realized.
The 10KV power grid is respectively connected with six load heating bodies JR1-JR6 through branch automatic bypass switches ZK1-ZK6, one end of a one-to-six switching switch ZK1'-ZK6' of a thyristor valve SCRF is connected with the branch automatic bypass switches ZK1-ZK6, the other end of the one-to-six switching switch is connected with the thyristor valve SCRF after being connected in parallel, the other end of the thyristor valve SCRF is connected with a SCRF switch ZKC, and the other end of the SCRF switch ZKC is connected with a 10KV network side power supply.
The six paths of load heating bodies JR1-JR6 have the same power.
The power-up regulation process of the regulation system is as follows: all the breaker switches are opened initially, firstly, the SCRF switch ZKC and the one-to-six switching switch ZK1' are closed, and the thyristor valve SCRF is in a cut-off state; then the conduction angle of the thyristor valve SCRF starts to increase, and the voltage on the load heating body JR1 gradually increases from 0; when the thyristor valve SCRF is fully conducted, the bypass automatic bypass switch ZK1 is closed, and the load heating body obtains 1/6 power; realizing continuous smooth adjustment from 0 to 1/6; one drags six to connect the switch ZK1 'to open, one drags six to connect the switch ZK2' to close, the thyristor valve SCRF begins to increase the conduction angle gradually from the cut-off state, the voltage on the load heating body JR2 begins to increase gradually from 0, the load power increases gradually and continuously from 1/6 to 2/6, then the automatic bypass switch ZK2 of the branch is closed; the rest of the paths are put into operation in the same way, so that the continuous smooth adjustment of the power of all the six paths from zero to the maximum is realized.
The power reduction regulation process of the regulating system is as follows: assuming that the initial state is that two branches are put into, and the branch automatic bypass switch ZK1 and the branch automatic bypass switch ZK2 are closed; firstly, the thyristor valve SCRF is in a full-on state, then a one-to-six switching switch ZK2' is closed, and then a branch automatic bypass switch ZK2 is opened; the conduction angle of the thyristor valve SCRF is gradually reduced from full opening, and the output power is continuously reduced until the thyristor valve SCRF is cut off; then the one-to-six change-over switch ZK2' is disconnected, so that continuous adjustment from 2/6 power to 1/6 power is realized; the disconnection process of the rest branches is analogized, so that continuous smooth adjustment of the power from maximum to minimum is realized, and all six branches are connected to full cut-off.
The invention has the following advantages and beneficial effects:
the invention is composed of a set of continuous voltage regulating circuit with multistage stepped regulation of equal power level, is a high-voltage high-power voltage regulating circuit, and has the characteristics of simple structure and reasonable design. The power can be directly taken from a 10KV power grid, and the voltage regulation requirement with the power of megawatts is completed. The voltage is continuously regulated between stages by the continuous voltage regulating circuit, so that the output voltage is continuously and smoothly regulated, and a very fine and smooth regulating effect can be obtained.
Drawings
The present invention will be further described in detail below with reference to the drawings and the detailed description, for the purpose of facilitating understanding and practicing the present invention by those of ordinary skill in the art, and it should be understood that the scope of the present invention is not limited by the detailed description.
Fig. 1 is a block diagram of a circuit connection of the present invention.
In the figure: automatic breaker ZKM, isolating switch GLK, bypass automatic bypass switches ZK1-ZK6, thyristor valve SCRF, one-to-six switching switch ZK1'-ZK6', SCRF switch ZKC,10KV thyristor valve SCRF, load heating body JR1-JR6.
Detailed Description
The invention relates to a 10KV thyristor valve group power regulating system, as shown in figure 1, figure 1 is a circuit connection block diagram of the invention, which consists of a plurality of sections of equal power levels, a set of continuous voltage regulating circuits, and is a high-voltage high-power voltage regulating circuit, and electricity is directly taken from a 10KV power grid, so that the voltage regulating requirement of megawatt is met. Consists of a plurality of switch cabinets, a sectional heating body is connected and disconnected, and a voltage adjusting cabinet is added. The system is divided into a plurality of branches, and each branch corresponds to a group of load heating bodies. The voltage adjusting units are respectively connected to the branches to be accessed through switch transfer, and then voltage adjustment is carried out. When the current branch circuit has reached the full-voltage output, the voltage regulator is switched to the next branch circuit to continue the voltage regulation. The capacity of the six branches is configured in an isovolumetric way, so that seamless continuous adjustment of output power from 0 to the maximum value is realized.
The invention is characterized in that a 10KV power grid is respectively connected with six paths of load heating bodies JR1-JR6 through branch automatic bypass switches ZK1-ZK6, and the power of the six paths of load heating bodies JR1-JR6 is the same. One end of one-to-six switching switch ZK1'-ZK6' of the thyristor valve SCRF is connected with the automatic bypass switches ZK1-ZK6 of the branch, the other end of the one-to-six switching switch is connected with the thyristor valve SCRF after being connected in parallel, the other end of the thyristor valve SCRF is connected with a SCRF switch ZKC, and the other end of the SCRF switch ZKC is connected with a 10KV network side power supply.
The power-up regulation process of the invention is as follows:
all the breaker switches are opened initially, the SCRF switch ZKC and the one-to-six change-over switch ZK1' are closed, and the thyristor valve SCRF is in a cut-off state. Then, the conduction angle of the thyristor valve SCRF starts to increase, and the voltage on the load heating body JR1 gradually increases from 0. When the thyristor valve SCRF is fully conducted, the bypass automatic bypass switch ZK1 is closed, and the load heating body obtains 1/6 power. A continuous smooth adjustment from 0 to 1/6 is achieved. One drags six change-over switch ZK1 'to open, one drags six change-over switch ZK2' to close, and thyristor valve SCRF begins to increase the conduction angle gradually from off state, and the voltage on load heating member JR2 begins to increase gradually from 0, and the load power increases gradually and continuously to 2/6 from 1/6, and then bypass switch ZK2 is closed. The rest of the paths are put into operation in the same way, so that the continuous smooth adjustment of the power of all the six paths from zero to the maximum is realized.
The power reduction regulation process of the invention is as follows:
assuming that two branches have been put into the initial state, the automatic bypass switch ZK1 and the automatic bypass switch ZK2 are already closed. Firstly, the thyristor valve SCRF is in a full-on state, then the one-to-six switching switch ZK2' is closed, and then the bypass automatic bypass switch ZK2 is opened. The conduction angle of the thyristor valve SCRF gradually decreases from full-on, and the output power continuously decreases until the thyristor valve SCRF is turned off. The one-to-six change-over switch ZK2' is then opened, and continuous regulation from 2/6 power to 1/6 power is realized. The disconnection process of the rest branches is analogized, so that continuous smooth adjustment of the power from maximum to minimum is realized, and all six branches are connected to full cut-off.
Claims (2)
1. A10 kilovolt thyristor valve group power regulating system is characterized in that: the high-voltage high-power voltage regulating circuit is formed by matching a set of continuous voltage regulating circuits with multi-stage stepped regulation of equal power levels, and is used for directly taking power from a 10KV power grid and completing the voltage regulating requirement of megawatt; the device is composed of a plurality of switch cabinets, a sectional heating body which is connected and disconnected, and a voltage adjusting cabinet; the system is divided into a plurality of branches, and each branch corresponds to a group of load heating bodies; the voltage adjusting units are respectively connected to branches to be accessed through switch transfer, and then voltage adjustment is carried out; when the current branch circuit has reached the full-voltage output, the voltage regulator is switched to the next branch circuit, and voltage regulation is continued; the capacity of the six branches is configured in an isovolumetric way, so that seamless continuous adjustment of output power from 0 to the maximum value is realized; the 10KV power grid is respectively connected with six load heating bodies JR1-JR6 through branch automatic bypass switches ZK1-ZK6, one end of a one-to-six switching switch ZK1'-ZK6' of a thyristor valve SCRF is connected with the branch automatic bypass switches ZK1-ZK6, the other end of the one-to-six switching switch is connected with the thyristor valve SCRF after being connected in parallel, the other end of the thyristor valve SCRF is connected with a SCRF switch ZKC, and the other end of the SCRF switch ZKC is connected with a 10KV power supply on the grid side; the power-up regulation process of the regulation system is as follows: all the breaker switches are opened initially, firstly, the SCRF switch ZKC and the one-to-six switching switch ZK1' are closed, and the thyristor valve SCRF is in a cut-off state; then the conduction angle of the thyristor valve SCRF starts to increase, and the voltage on the load heating body JR1 gradually increases from 0; when the thyristor valve SCRF is fully conducted, the bypass automatic bypass switch ZK1 is closed, and the load heating body obtains 1/6 power; realizing continuous smooth adjustment from 0 to 1/6; one drags six to connect the switch ZK1 'to open, one drags six to connect the switch ZK2' to close, the thyristor valve SCRF begins to increase the conduction angle gradually from the cut-off state, the voltage on the load heating body JR2 begins to increase gradually from 0, the load power increases gradually and continuously from 1/6 to 2/6, then the automatic bypass switch ZK2 of the branch is closed; the input process of the rest paths is similar, so that continuous smooth adjustment of the power of all the six paths from zero to the maximum is realized; the power reduction regulation process of the regulating system is as follows: assuming that the initial state is that two branches are put into, and the branch automatic bypass switch ZK1 and the branch automatic bypass switch ZK2 are closed; firstly, the thyristor valve SCRF is in a full-on state, then a one-to-six switching switch ZK2' is closed, and then a branch automatic bypass switch ZK2 is opened; the conduction angle of the thyristor valve SCRF is gradually reduced from full opening, and the output power is continuously reduced until the thyristor valve SCRF is cut off; then the one-to-six change-over switch ZK2' is disconnected, so that continuous adjustment from 2/6 power to 1/6 power is realized; the disconnection process of the rest branches is analogized, so that continuous smooth adjustment of the power from maximum to minimum is realized, and all six branches are connected to full cut-off.
2. The 10kv thyristor valve block power conditioning system of claim 1, wherein: the six paths of load heating bodies JR1-JR6 have the same power.
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