CN114123209B - Tidal current control system and method suitable for power transmission line of power system - Google Patents
Tidal current control system and method suitable for power transmission line of power system Download PDFInfo
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- CN114123209B CN114123209B CN202010882417.0A CN202010882417A CN114123209B CN 114123209 B CN114123209 B CN 114123209B CN 202010882417 A CN202010882417 A CN 202010882417A CN 114123209 B CN114123209 B CN 114123209B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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Abstract
The invention discloses a tide control system and a method suitable for a power transmission line of a power system, wherein the system comprises a first power transmission line, a second power transmission line, an MGP unit and an adjusting unit which are connected in parallel; the MGP unit comprises a synchronous motor and a synchronous generator which are coaxially and rigidly connected and connected in series in the first power transmission line; when the active power and the load capacity of the first power transmission line are monitored to not meet the preset requirements, the adjusting unit adjusts excitation of the synchronous motor and the synchronous generator in the MGP unit, so that the active power and the load capacity of the first power transmission line meet the set requirements, and power flow control of the power transmission line of the power system is completed. The invention can flexibly and reliably carry out tide adjustment, thereby effectively avoiding the problems of uneven tide distribution of the power delivery channel, overload of the transmission line and the like after the electric energy is fed into the receiving end system and ensuring the safe and stable operation of the power grid.
Description
Technical Field
The invention belongs to the technical field of power system stability and control, and particularly relates to a power flow control system and method suitable for a power transmission line of a power system.
Background
At present, china is still in the transition period of the construction of an extra-high voltage power grid, and the extra-high voltage alternating current power grid is still one of main grid frames for power transmission. Because of the problems of thermal stability, transient stability and dynamic stability, the transmission capacity of about 1/4 line is limited, and the transmission capacity is mainly concentrated on the cross-region alternating current networking line and the heavy-load section inside the regional power grid. The traditional scheme comprises measures such as newly built circuits and circuit capacity increase, and the like, and can solve the related problems, but the investment is huge, the construction difficulty is extremely high, and the novel technical means are needed to be adopted for cracking.
Disclosure of Invention
In order to solve the problems, the invention provides a power flow control system and a power flow control method suitable for a power transmission line of a power system, wherein the sizes of active power and reactive power in a loop are controlled by adjusting the sizes of exciting currents output by a motor and a generator in a synchronous motor-synchronous generator set, and when a line breaks down, the power flow control is timely and reliably and effectively performed, so that overload of the line is prevented, the accident is enlarged, and the stability and the power quality of the power system are improved.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a power flow control system suitable for a transmission line of a power system, comprising:
the first power transmission line and the second power transmission line are connected in parallel;
the MGP unit comprises a synchronous motor and a synchronous generator which are coaxially and rigidly connected and connected in series in the first power transmission line;
and the adjusting unit is used for adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit when the active power and the load capacity of the first power transmission line are monitored to not meet the preset requirements, so that the active power and the load capacity of the first power transmission line meet the set requirements, and the power flow control of the power transmission line of the power system is completed.
Optionally, when the active power in the first power transmission line is greater than the load capacity of the first power transmission line, excitation of the synchronous motor and the synchronous generator in the MGP unit is adjusted so that the active power transmitted through the second power transmission line is increased until the first power transmission line returns to the normal running state.
Optionally, when the active power in the second power transmission line is greater than the load capacity of the second power transmission line, excitation of the synchronous motor and the synchronous generator in the MGP unit is adjusted so that the active power transmitted through the first power transmission line is increased until the second power transmission line returns to the normal running state.
Optionally, when the first power transmission line and the second power transmission line are both in a normal power transmission state, excitation of a motor and a generator of the MGP unit is adjusted, active power distribution through the first power transmission line and the second power transmission line is changed, and the line loss rate is the lowest.
In a second aspect, the present invention provides a method for controlling power flow of a power transmission line of a power system, the power transmission line including a first power transmission line and a second power transmission line connected in parallel, the method comprising:
coaxially and rigidly connecting the synchronous motor and the synchronous generator, and then connecting the synchronous motor and the synchronous generator in series to a first power transmission line;
collecting active power of a first transmission line;
and when the active power and the load capacity of the first power transmission line do not meet the preset requirements, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to enable the active power and the load capacity of the first power transmission line to meet the set requirements, and completing flow control of the power transmission line of the power system.
Optionally, when the active power in the first power transmission line is greater than the load capacity of the first power transmission line, excitation of the synchronous motor and the synchronous generator in the MGP unit is adjusted so that the active power transmitted through the second power transmission line is increased until the first power transmission line returns to the normal running state.
Optionally, collecting active power of the second transmission line;
and when the active power in the second power transmission line is larger than the load capacity of the second power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted through the first power transmission line until the second power transmission line is restored to a normal running state.
Optionally, the method further comprises:
and acquiring states of the first power transmission line and the second power transmission line, and when the first power transmission line and the second power transmission line are in a normal power transmission state, adjusting excitation of a motor and a generator of the MGP unit, and changing active power distribution passing through the first power transmission line and the second power transmission line to enable the line loss rate to be the lowest.
Compared with the prior art, the invention has the beneficial effects that:
the invention controls the active power and the reactive power in the transmission line by adjusting the excitation of the synchronous motor and the synchronous generator in the MGP unit, and timely and effectively performs power flow control when the transmission line fails, thereby preventing overload of the line and expanding accidents and improving the stability and the electric energy quality of the power system.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
fig. 1 is a schematic diagram of a topology structure of a tidal current control system suitable for a transmission line of a power system according to the present invention.
FIG. 2 is a graph of the power angle relationship of the MGP unit in FIG. 1;
FIG. 3 is a graph of the power angle relationship of the MGP unit in FIG. 2;
fig. 4 is a graph of the power angle relationship of the MGP unit 3.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The principle of application of the invention is described in detail below with reference to the accompanying drawings.
A synchronous Motor-generator Pair (MGP) is a device that transmits electric energy to a synchronous Motor, which rotates a synchronous generator rigidly connected thereto, and retransmits the electric energy to a line after exciting a rotor of the synchronous generator. The MGP has the advantages of improving the disturbance rejection capability of the circuit by depending on the inertia and damping characteristics of the motor, providing short-circuit capacity support and voltage support for the power grid by the synchronous motor suction-emission non-functional capability, maintaining the voltage stability and fault isolation capability and harmonic suppression capability of the circuit, and improving the quality of the power transmitted by the circuit. Meanwhile, the active power and the reactive power in the loop can be controlled by dispatching and adjusting the excitation of the generator set, the motor in the MGP and the generator, so that the flow control of the loop is realized. Therefore, the invention provides a power flow control system and a power flow control method for a power system by utilizing an MGP unit, wherein the active power and the reactive power in a power transmission line are controlled by adjusting excitation of a synchronous motor and a synchronous generator in the MGP unit, and the power flow control is timely and effectively performed when the power transmission line breaks down, so that the overload of the line is prevented, the accident is enlarged, and the stability and the power quality of the power system are improved.
Example 1
Referring to fig. 2, when the synchronous motor exciting current I in the MGP unit fM Equal to synchronous generator excitation current I fG Since the synchronous motor M and the synchronous generator G are connected to a large power grid, the terminal voltage U of the synchronous motor at a certain period is considered M And terminal voltage U of synchronous generator grid Is unchanged, thus U M And U grid The included angle between the synchronous motor and the synchronous generator is unchanged, and the power angles of the synchronous motor and the synchronous generator are respectively delta M And delta G And delta M ＝δ G Exciting potential amplitude E M ＝E G The output power is P+jQ.
Referring to fig. 3, since the synchronous motor and the synchronous generator in the MGP unit are coaxially connected, the internal electric potential E of both is M And E is G The phase angle difference of beta remains unchanged, thus increasing the motor excitation to I 'based on fig. 2' fM Then E M Increase to E' M ，δ M Reduced to delta' M Beta is unchanged, resulting in a power angle delta of the generator G Become larger to delta' G While the excitation of the synchronous generator is unchanged, E G Unchanged according to the active power calculation formulaWherein E is the excitation potential amplitude of the generator or the motor, U is the terminal voltage amplitude of the generator or the motor, and X d Synchronous reactance of generator or motor, delta is generator or motorThe power angle of the machine is increased, and the active power is increased according to the reactive power calculation formula +.>At this time, reactive power becomes large.
Referring to fig. 4, since the synchronous motor and the synchronous generator in the MGP unit are coaxially connected, the internal electricity E of both is M And E is G The phase angle difference of beta remains unchanged, so on the basis of figure 3, the excitation of the synchronous motor is increased to I' fG ＝I' fM Since beta is unchanged, U M And U grid The included angle is unchanged, the excitation of the synchronous motor and the synchronous generator is the same, so the power angle is equal, and E is increased due to the increase of excitation M E and E G The amplitude of the two components is increased to E' M And E'. G According to the active power calculation formulaThe active power increases at this time, according to the reactive power calculation formula +.>At this time, reactive power becomes large.
Based on the above analysis, the embodiment of the invention provides a system for controlling the flow of tidal current of a transmission line of a power system, which comprises:
the first power transmission line and the second power transmission line are connected in parallel; in the actual use process, as shown in fig. 1, two ends of the first power transmission line (L1) and the second power transmission line (L2) are respectively connected to a busbar L1 and a busbar L2, the busbar L1 is provided with a load p1+jq1, and the busbar L2 is provided with a load p2+jq2; the buses L1 and L2 are respectively connected with synchronous generators G1 and G2;
the MGP unit comprises a synchronous motor and a synchronous generator which are coaxially and rigidly connected, and are connected in series in a first power transmission line, electric energy in the first power transmission line is transmitted to the synchronous motor, the synchronous motor drives the synchronous generator rigidly connected with the synchronous motor to rotate, and the electric energy is re-transmitted to the line after excitation is applied to a rotor of the synchronous generator;
and the adjusting unit is used for adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit when the active power and the load capacity of the first power transmission line are monitored to not meet the preset requirements, so that the active power and the load capacity of the first power transmission line meet the set requirements, and the power flow control of the power transmission line of the power system is completed.
When the first transmission line between the buses L1 and L2 is overloaded due to a fault or other reasons, the active power in the first transmission line increases to exceed the line load capacity P L When the synchronous motor and the synchronous generator in the MGP unit are excited, the active power passing through the second transmission line is increased by delta P, and when the total power generated by the synchronous generators G1 and G2 is unchanged, the active power of the first transmission line is reduced by delta P and is reduced to the load capacity P of the first transmission line L The power on the first transmission line is restored to a normal level below; similarly, when the load of the first power transmission line between the buses L1 and L2 is reduced, the active power in the first power transmission line is smaller than the load capacity of the first power transmission line, and the active power transmitted through the second power transmission line is reduced through the power flow control of the MGP unit until the first power transmission line is restored to the normal running state.
When the second transmission loop between the buses L1 and L2 is overloaded due to a fault or other cause, the active power in the second transmission loop increases to exceed the second line load capacity P L When the total power generated by the synchronous generator G1 and G2 is unchanged, the active power of the second transmission loop is reduced by delta P and reduced to the second line load capacity P L The power on the second line is restored to normal level below; similarly, when the load of the second power transmission loop between the buses L1 and L2 is reduced, the active power in the second power transmission loop is smaller than the load capacity of the second power transmission line, and the power transmitted by the first power transmission line is reduced through the power flow control of the MGP unit until the second power transmission line is restored to the normal running state.
When the first power transmission loop and the second power transmission loop of the loop between the buses L1 and L2 are in a normal power transmission state, the active power passing through the second power transmission line and the active power distribution of the first power transmission line are changed by adjusting the excitation of the synchronous motor and the synchronous generator of the MGP unit, so that the lowest line loss rate is realized, and the power transmission economy of the line is improved.
Example 2
The embodiment of the invention provides a power flow control method suitable for a power transmission line of a power system, wherein the power transmission line comprises a first power transmission line and a second power transmission line which are connected in parallel, and the method comprises the following steps:
coaxially and rigidly connecting the synchronous motor and the synchronous generator, and then connecting the synchronous motor and the synchronous generator in series to a first power transmission line;
and collecting active power of the first power transmission line, and when the active power and the load capacity of the first power transmission line do not meet the preset requirements, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to enable the active power and the load capacity of the first power transmission line to meet the set requirements, so that tide control of the power transmission line of the power system is completed.
And when the active power in the first power transmission line is larger than the load capacity of the first power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted through the second power transmission line until the first power transmission line is restored to a normal running state.
And collecting active power of the second power transmission line, and when the active power in the second power transmission line is larger than the load capacity of the second power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted by the first power transmission line until the second power transmission line is restored to a normal running state, so that the overall line loss of the system is reduced, and the running economy of the system is improved.
The method further comprises the steps of:
and acquiring states of the first power transmission line and the second power transmission line, and when the first power transmission line and the second power transmission line are in a normal power transmission state, adjusting excitation of a motor and a generator of the MGP unit, and changing active power distribution passing through the first power transmission line and the second power transmission line to enable the line loss rate to be the lowest.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A power flow control system for a power transmission line of a power system, comprising:
the first power transmission line and the second power transmission line are connected in parallel;
the MGP unit comprises a synchronous motor and a synchronous generator which are coaxially and rigidly connected and connected in series in the first power transmission line;
the adjusting unit is used for adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit when the active power and the load capacity of the first power transmission line are monitored to not meet the preset requirements, so that the active power and the load capacity of the first power transmission line meet the set requirements, and the tide control of the power transmission line of the power system is completed;
when the active power in the first power transmission line is larger than the load capacity of the first power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted by the second power transmission line until the first power transmission line is restored to a normal running state;
when the active power in the second power transmission line is larger than the load capacity of the second power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted by the first power transmission line until the second power transmission line is restored to a normal running state;
when the first power transmission line and the second power transmission line are in a normal power transmission state, excitation of a motor and a generator of the MGP unit is regulated, active power distribution passing through the first power transmission line and the second power transmission line is changed, and the line loss rate is the lowest.
2. A power flow control method suitable for a power transmission line of a power system, the power transmission line comprising a first power transmission line and a second power transmission line connected in parallel, the method comprising:
coaxially and rigidly connecting the synchronous motor and the synchronous generator, and then connecting the synchronous motor and the synchronous generator in series to a first power transmission line;
collecting active power of a first transmission line;
when the active power and the load capacity of the first power transmission line do not meet the preset requirements, the excitation of the synchronous motor and the synchronous generator in the MGP unit is regulated, so that the active power and the load capacity of the first power transmission line meet the set requirements, and the power flow control of the power transmission line of the power system is completed;
when the active power in the first power transmission line is larger than the load capacity of the first power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted by the second power transmission line until the first power transmission line is restored to a normal running state;
collecting active power of a second transmission line;
when the active power in the second power transmission line is larger than the load capacity of the second power transmission line, adjusting excitation of the synchronous motor and the synchronous generator in the MGP unit to increase the active power transmitted by the first power transmission line until the second power transmission line is restored to a normal running state;
the method further comprises the steps of:
and acquiring states of the first power transmission line and the second power transmission line, and when the first power transmission line and the second power transmission line are in a normal power transmission state, adjusting excitation of a motor and a generator of the MGP unit, and changing active power distribution passing through the first power transmission line and the second power transmission line to enable the line loss rate to be the lowest.
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