CN110571849B - Rapid control method for responding to power instruction by virtual synchronous machine - Google Patents
Rapid control method for responding to power instruction by virtual synchronous machine Download PDFInfo
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- CN110571849B CN110571849B CN201910768383.XA CN201910768383A CN110571849B CN 110571849 B CN110571849 B CN 110571849B CN 201910768383 A CN201910768383 A CN 201910768383A CN 110571849 B CN110571849 B CN 110571849B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a method for quickly controlling a virtual synchronous machine to respond to a power instruction, which comprises the following steps: receiving a power instruction and sending the power instruction to a control module; calculating a reference voltage phase angle through the control module; sending the reference voltage phase angle to a voltage and current double-loop control link; the voltage and current double-loop control link controls the voltage phase angle of the port of the inverter to be the same as the reference voltage phase angle through feedback control; when the virtual synchronous machine participates in power grid dispatching, the change of the power instruction is quickly responded, and the capability of quickly adjusting the power of the inverter type power supply is fully exerted.
Description
Technical Field
The invention relates to a quick control method for a virtual synchronous machine to respond to a power instruction, and belongs to the technical field of inverter control.
Background
The virtual synchronous machine technology enables the inverter to have the external operation characteristics of inertia, damping and the like similar to those of the synchronous generator by simulating the electromechanical transient characteristics of the synchronous generator. The power generation or load power can be adjusted in real time according to the frequency and voltage changes of the power grid, the requirements of primary frequency modulation and primary voltage regulation are met, networking voltage can be provided in the form of a voltage source, and the stability of the system is improved.
However, the virtual synchronous machine introduces an inertia link, so that the virtual synchronous machine is slowly adjusted when responding to a scheduling power instruction, and the advantage that the power of the inverter type power supply can be quickly adjusted is lost.
Disclosure of Invention
The invention aims to provide a method for quickly controlling a virtual synchronous machine to respond to a power instruction, so as to overcome the defects that the adjustment is slow when the power instruction is dispatched in response, and the advantage that the inverter type power supply can be quickly adjusted is lost in the prior art.
A method for quickly controlling a virtual synchronous machine to respond to a power instruction comprises the following steps:
receiving a power instruction and sending the power instruction to a control module;
calculating a reference voltage phase angle through the control module;
sending the reference voltage phase angle to a voltage and current double-loop control link;
and the voltage and current double-loop control link controls the voltage phase angle of the port of the inverter to be the same as the reference voltage phase angle through feedback control.
Preferably, the control module comprises a virtual synchronous machine control module and a power instruction feedforward control module;
the virtual synchronous machine control module outputs a reference voltage amplitude and a reference voltage phase angle I through operation;
and the power instruction feedforward control module outputs a reference voltage phase angle two through operation.
Preferably, the reference voltage phase angle sent to the voltage and current dual-loop control link is the sum of the reference voltage phase angle one and the reference voltage phase angle two.
Preferably, the first reference voltage phase angle is continuously changed all the time and cannot be suddenly changed, and the second reference voltage phase angle can be suddenly changed.
Preferably, the rate of change of the reference voltage phase angle one is calculated as: w ═ w0+Kp(Pref-Pact) (ii) a Wherein, w0Rated angular frequency for the grid; kpIs a control parameter; prefIs a power command; pactIs the actual power;
calculating the variation of a reference voltage phase angle I: delta theta1W Δ t; wherein, Δ t is a control period;
will delta theta1Superimposed on the current reference voltage phase angle one.
Preferably, the reference voltage phase angle two is calculated by:
Compared with the prior art, the invention has the following beneficial effects: when the virtual synchronous machine participates in power grid dispatching, the change of the power instruction is quickly responded, and the capability of quickly adjusting the power of the inverter type power supply is fully exerted.
Drawings
FIG. 1 is a flow chart of an example of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1, a method for quickly controlling a virtual synchronous machine to respond to a power instruction is disclosed: the method comprises the following steps:
(a) receiving a power instruction and respectively sending the power instruction to a virtual synchronous machine control module and a power instruction feedforward control module;
(b) calculating a reference voltage phase angle through the control module;
(c) the power instruction feedforward control module outputs a reference voltage phase angle II through operation, and the reference voltage phase angle II can be suddenly changed;
(d) adding the reference voltage phase angle I and the reference voltage phase angle II to form a final reference voltage phase angle, and entering a subsequent voltage and current double-loop control link together with a reference voltage amplitude;
(e) the voltage and current double-loop control link controls the phase angle of the voltage of the port of the inverter to be the same as the phase angle of the reference voltage through feedback control
In the step (c), the operation method of the voltage phase angle one is as follows: calculating the change rate of a reference voltage phase angle I: w ═ w0+Kp(Pref-Pact) (ii) a Wherein, w0Rated angular frequency for the grid; kpIs a control parameter; prefIs a power command; pactIs the actual power;
calculating the variation of a reference voltage phase angle I: delta theta1W Δ t; wherein, Δ t is a control period;
will delta theta1Superimposed on the current reference voltage phase angle one.
The operation method of the reference voltage phase angle II comprises the following steps:
wherein, theta2Is a reference voltage phase angle II; prefIs a power command; pnIs the rated power of the virtual synchronous machine; kcThe short circuit ratio of the virtual synchronous machine connected to the power grid is obtained; the reference voltage phase angle theta1Phase angle theta with said reference voltage2Added as the final reference voltage phase angle thetarefWith said reference voltage amplitude VrefEntering a subsequent voltage and current double-loop control link;
receiving power command PrefRespectively sending the power command to the virtual synchronous machine control module and the power command feedforward control module;
in the present embodiment, the power command PrefScheduled by the grid or manually entered.
The virtual synchronous machine control module outputs a reference voltage amplitude V through operationrefAnd a reference voltage phase angle theta1；
The power instruction feedforward control module outputs a reference voltage phase angle theta through operation2；
By implementing the method for quickly controlling the response of the virtual synchronous machine to the power instruction, the virtual synchronous machine can quickly respond to the change of the power instruction when participating in power grid dispatching, and the capability of quickly adjusting the power of the inverter type power supply is fully exerted.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A method for quickly controlling a virtual synchronous machine to respond to a power instruction is characterized by comprising the following steps:
receiving a power instruction and sending the power instruction to a control module;
calculating a reference voltage phase angle through the control module;
sending the reference voltage phase angle to a voltage and current double-loop control link;
the voltage and current double-loop control link controls the voltage phase angle of the port of the inverter to be the same as the reference voltage phase angle through feedback control;
the control module comprises a virtual synchronous machine control module and a power instruction feedforward control module;
the virtual synchronous machine control module outputs a reference voltage phase angle I through operation;
the power instruction feedforward control module outputs a reference voltage phase angle two through operation;
the reference voltage phase angle II calculation method comprises the following steps:
and the reference voltage phase angle sent into the voltage and current double-loop control link is the sum of the reference voltage phase angle I and the reference voltage phase angle II.
2. The method as claimed in claim 1, wherein the first reference voltage phase angle is continuously variable and cannot be changed abruptly, and the second reference voltage phase angle can be changed abruptly.
3. The method for fast controlling the virtual synchronous machine to respond to the power command as claimed in claim 1, wherein the reference voltage phase angle is calculated by:
calculating a reference voltage phaseRate of change of angle one:w= w 0+K p (P ref-P act) (ii) a Wherein the content of the first and second substances,w 0rated angular frequency for the grid;K pis a control parameter;P refis a power command;P actis the actual power;
calculating the variation of a reference voltage phase angle I: deltaθ 1= wΔ t; wherein, Δ t is a control period;
will be deltaθ 1Superimposed on the current reference voltage phase angle one.
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| CN104578857B (en) * | 2015-01-12 | 2017-07-28 | 阳光电源股份有限公司 | Control method, control device and the photovoltaic generating system of photovoltaic generating system |
| US9887547B2 (en) * | 2015-11-27 | 2018-02-06 | Delta Electronics (Shanghai) Co.,Ltd. | Method and apparatus for decoupling the power of grid-connected inverter |
| CN106786733B (en) * | 2016-12-05 | 2019-03-29 | 广东电网有限责任公司电力科学研究院 | A kind of control method of virtual synchronous generator, apparatus and system |
| CN109217346B (en) * | 2017-07-06 | 2021-04-20 | 许继电气股份有限公司 | Back-to-back direct current power transmission system based on virtual synchronous machine and control method |
| US10536003B1 (en) * | 2018-07-20 | 2020-01-14 | University Of South Florida | Power system stabilizer for voltage source converters |
| CN109088439B (en) * | 2018-08-17 | 2022-01-11 | 江苏大学 | Control method of inverter parallel system based on secondary frequency modulation and virtual homopolar generator algorithm |
| CN109494755A (en) * | 2019-01-09 | 2019-03-19 | 东北大学 | A kind of virtual synchronous generator no-voltage passes through control system and control method |
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